CN103306622A - Hydraulically-pressurizing rope coring drill - Google Patents

Abstract

The present invention is a hydraulic pressurized wireline core drilling tool, the inner tube assembly includes a ball suspension hydraulic pressurization mechanism, and the inner tube assembly also includes a reversing valve for dredging flushing fluid. The bottom of the reversing valve has a heart cavity that communicates with a group of liquid outlets of the reversing valve. The piston core of the ball suspension hydraulic pressure mechanism is a tubular piston core with a top seal, and the end of the piston core is located at The heart cavity and the heart cavity form a sealed pressurized space, and a side opening for flushing medium is provided at the end of the piston core extending into the reversing valve core cavity, and the other part of the reversing valve A set of liquid outlets is arranged correspondingly to the side opening of the piston core. The top of the piston core of the present invention is sealed, and a side opening is provided at the end of the reversing valve core cavity, so that the flushing medium pushes the piston core down to the side opening of the piston core and enters the piston sleeve to form a sealed water blocking pressurized space , no need to pitch, solve the problem of pitching.

Description

Hydraulic pressurized wireline core drilling tool

technical field

The invention relates to a coring tool for complex formations, in particular to a hydraulic pressurized wireline core drilling tool.

Background technique

With the sharp reduction of unproven shallow mineral resources in the more developed domestic economic areas, in order to ensure that the exploration and development of mineral resources continues to maintain rapid development, while geological core drilling responds to the grand strategy of "finding blindness with power and depth", the shallow Core drilling in complex formations has also been placed in a position that has been paid more and more attention. Drilling in shallow complex formations has always been listed as a "forbidden zone" for drilling construction due to serious hole wall collapse, collapse accompanied by leakage, and extremely difficult to guarantee core sampling rate, which seriously hindered the development and deepening of geological exploration work.

Press-card coring technology is a coring technology for complex formations such as loose, poorly cemented, and easily broken. It is a relatively mature coring technology for complex formations independently developed by our country, but due to its structural requirements, it is only used in the field of oil fields. Press card coring technology is mainly divided into mechanical pressure coring technology and hydraulic pressure coring technology. Press card coring technology is to apply downward pressure on the upper part of the inner tube at the end of the round to make the inner tube The multi-lobed core claws at the lower part of the pipe are mechanically deformed and retracted along the slope of the inner surface of the drill bit to achieve the purpose of closed coring.

The ball-pressing type wireline core drilling tool mainly includes an outer pipe assembly and an inner pipe assembly. The outer pipe assembly includes positioning joints, centralizers, outer pipes, reamers and bottom spray drill bits connected in sequence from top to bottom, and the inner pipe assembly includes spear fishing mechanism, positioning mechanism, hydraulic pressure mechanism, single actuator, inner tube and core jaws. Wherein the hydraulic pressure mechanism includes a piston core, a piston sleeve and a piston outer cylinder. There is a pressure relief hole on the upper bottom of the piston outer cylinder. The piston core is a tubular shape with two ends open. It is locked during normal cycle drilling, and unlocked during pressurized coring, so that the piston core and piston sleeve are driven down together for coring under the pressure of the closed water blocking pressurized space. When in use, the hydraulic pressurized core drilling tool is connected under the drill pipe, and the drilling tool is provided with flushing fluid through the drill pipe.

During the working process of this drilling tool, the flushing fluid is circulated twice, the first circulation is a normal drilling cycle, and the second circulation provides pressure for the hydraulic pressure mechanism to perform coring. The details are as follows: during the construction process, the inner pipe assembly is put in, the mud pump is turned on (the mud is used as the flushing fluid), the flushing fluid circulates for the first time, and the flushing fluid enters the piston core of the hydraulic pressure mechanism, passes through the piston core, and then flows into the Normal circulation drilling is carried out in the flushing medium circulation channel (the annular gap between the inner pipe assembly and the outer pipe assembly); after the normal circulation drilling is completed, the pump is turned off; Drop to the predetermined position (block the upper end opening of the piston core), close the liquid flow channel (the closed liquid flow channel is formed between the top of the piston core and the outer tube), and form a piston mechanism to pressurize (block) water, for The hydraulic pressure mechanism provides pressure to shrink the core claws to achieve the purpose of coring and protecting the core; when the flushing fluid reaches the discharge hole of the piston outer cylinder, the liquid flows out from the discharge hole, and the drilling is completed.

In this structure, the flushing fluid is required to enter the flushing medium circulation channel through the hydraulic pressurization mechanism during normal circulation drilling, so the piston core of the flushing medium circulation channel is generally designed to have an upper end opening (to facilitate the entry of flushing fluid), but this is for flushing fluid Coring in the secondary cycle brings trouble, because a closed water blocking and pressurized space needs to be formed on the top of the piston core during the secondary cycle to push the hydraulic pressurization mechanism down to coring. Putting in steel balls, but the ball throwing process is cumbersome, the auxiliary time is long, and the degree of automation is low, which brings hidden dangers to the stability of the well wall.

In view of this, the present invention is proposed.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, and provide a hydraulic pressurized wireline core drilling tool that can form a closed water blocking pressurized space without throwing balls after the normal cycle drilling is completed.

In order to solve the problems of the technologies described above, the present invention adopts the basic idea of technical solution to be:

A hydraulic pressurized wireline core drilling tool, the inner tube assembly includes a ball suspension hydraulic pressurization mechanism, the inner tube assembly also includes a reversing valve for dredging flushing fluid, and the reversing valve The bottom of the bottom has a heart cavity that communicates with a group of liquid outlets of the reversing valve. The piston core of the ball suspension hydraulic pressurization mechanism is a tubular piston core with a top seal, and the end of the piston core is located at the core. The chamber and the heart chamber form a sealed pressurized space, and a side opening for flushing medium is provided at the end of the piston core extending into the reversing valve core chamber, and the other group of outlets of the reversing valve The liquid port is arranged corresponding to the side opening of the piston core.

Further, the inner tube assembly also includes a single-action mechanism, the piston sleeve of the ball suspension hydraulic pressure mechanism is connected to the single-action mechanism, and the side wall of the piston sleeve is provided with a Drain hole for flushing media.

As a preferred solution, the reversing valve is a hydraulically controlled reversing valve with a control medium passage for entering the flushing medium and two sets of working medium passages for outputting the flushing medium. With multiple injections of the flushing medium, The hydraulic control reversing valve connects the control medium passage with different working medium passages, so that the secondary washing liquid is output from different liquid outlets, and the valve core moves upward to reset when the control liquid is released.

As a preferred solution, the hydraulic control reversing valve includes a valve body and a valve core;

In the valve body there are: the control medium passage; the two groups of working medium passages; The medium passage forms a pressurizing liquid chamber, thereby pushing the valve disc downward; an elastic driving mechanism, the elastic driving mechanism is connected between the valve plug and the valve disc, and is used to push the valve disc when the control medium is injected Downward; a valve disc with a central hole, with a reversing guide hole around the central hole, the valve disc is sleeved on the valve core between the working medium passage and the control medium passage; an energy storage reset mechanism, Energy is stored when the medium is controlled, and energy is released when the pressure is released to flush the medium so as to push the valve core upward; and a reversing mechanism injects the flushing medium multiple times, and the reversing mechanism makes the control medium passage and different working medium passages Connected and the spool moves upward to reset when the control fluid pressure is released.

As a preferred solution, the reversing mechanism includes a valve sleeve installed in the valve body and sleeved outside the valve core, a first set of ratchet mechanism is installed between the valve disc and the valve sleeve, A second ratchet mechanism is installed between the valve disc and the valve core;

When the control medium is injected, the valve disc and the valve sleeve are engaged by the first ratchet mechanism, driving the valve disc to rotate forward, so that the control medium passage and the working medium passage are connected; when the flushing medium is released, the valve disc Engage with the spool through the second ratchet mechanism to drive the spool upward and reset.

As a preferred solution, the bottom of the valve disc is provided with a ring of axially downward annular ratchets around the central hole, and the valve sleeve is a ratchet sleeve with a ring of axially upward annular ratchets on its inner peripheral surface. , the ratchets of the valve disc and the ratchet sleeve form a first set of ratchet mechanism; The teeth and the ratchet of the ratchet shaft form the second set of ratchet mechanism; the ratchet sleeve is connected with the valve body in the circumferential and axial directions, and the ratchet shaft is relative to the ratchet sleeve in the circumferential direction. Positioning and axial sliding connection; wherein the ratchets of the valve disc, ratchet shaft and ratchet sleeve are all wedge teeth, and the wedge angles of the three are equal, and the wedge surfaces are coupled to each other. The ratchet shaft and ratchet sleeve The ratchet bevel is on the same side.

As a preferred solution, the ratchet shaft and the ratchet sleeve are nestedly connected through axial splines and spline grooves.

As a preferred solution, the ratchet of the ratchet shaft is formed at the key end of the ratchet shaft, and the ratchet of the ratchet sleeve is formed at the key end of the ratchet sleeve.

As a preferred solution, the ratchet sleeve and the valve body are positioned and connected through the cross projection provided on the upper lip of the ratchet sleeve and the groove of the port of the valve body.

As a preferred solution, the energy storage reset mechanism is a reset spring in the ratchet sleeve, the reset spring is sleeved on the ratchet shaft, one end of which is fixed to the ratchet shaft, and the other end is connected to the blocking member.

After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

The hydraulic pressurized wireline coring tool of the present invention is sealed at the top of the piston core, and only a side opening is provided at the end protruding into the reversing valve core chamber, so the flushing medium pushes the piston core down to the side opening of the piston core. When the hole enters the piston sleeve, a sealed water blocking and pressurized space can be formed, so there is no need to throw the ball, which solves the problems of cumbersome throwing process, long auxiliary time, low degree of automation, and hidden dangers to the stability of the well wall.

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is the overall mechanism diagram of the hydraulic pressurized wireline core drilling tool of the present invention;

Fig. 2 is a cross-sectional view of the connecting part of the hydraulic control reversing valve and the ball suspension hydraulic pressure mechanism of the present invention;

Fig. 3 is the external view of the hydraulic control reversing valve;

Fig. 4 is a schematic diagram of the structure of the valve plug joint of the hydraulic control reversing valve;

Fig. 5 is a schematic diagram of the seat structure of the hydraulic control reversing valve;

Fig. 6 is a schematic structural diagram of the ratchet sleeve of the hydraulic control reversing valve;

Fig. 7 is a schematic diagram of the structure of the ratchet shaft of the hydraulic control reversing valve;

Fig. 8 is a schematic diagram of the structure of the valve disc of the hydraulic control reversing valve;

Fig. 9 is a process diagram of the valve disc of the hydraulic control reversing valve, the ratchet shaft and the ratchet sleeve engaging with each other to realize the rotation of the valve disc.

Fig. 10 is a schematic diagram of the structure of the piston outer cylinder of the ball suspension hydraulic pressure mechanism;

Fig. 11 is a structural schematic diagram of the piston sleeve of the ball suspension hydraulic pressure mechanism;

Fig. 12 is an exploded view of the ball suspension hydraulic pressure mechanism.

In the picture:

Hinged Spearhead Mechanism--1' Bullet Positioning Mechanism--2' Hydraulic Control Reversing Valve--3' Ball Suspension Hydraulic Pressure Mechanism--4' Single Action Mechanism--5' Inner Tube--6' Core Claw -- 7'

Hydraulic control reversing valve part:

Plug connector--60 Valve seat--80

Valve plug connector: liquid inlet--600 liquid inlet channel-601 liquid storage chamber-602;

Valve disc - 110 Valve disc: central hole - 1100 Ring ratchet - 1101 Reversing guide hole - 1102;

Valve plug--241 Spring pressing plate--242 Compression spring--243

Seat: center hole - 800 port groove 803 heart chamber - 30 straight channel - 805 curved channel - 806 ratchet shaft - 100 ratchet shaft ratchet - 1001 ratchet sleeve ratchet - 901 ratchet Left ratchet 901a of the ratchet sleeve Right ratchet 901b of the ratchet sleeve Cross projection on the upper lip of the ratchet sleeve--802 Return spring--25 Adjusting pressure plate--81

Ball suspension hydraulic pressure mechanism part:

Piston core--20 Annular groove--200 Liquid inlet hole of piston core--201

Piston sleeve--21 Four radial round holes in the middle of the piston sleeve--210 Drain hole--211 Spring--212 Piston outer cylinder--22 Positioning steel ball--23

Detailed ways

Referring to Fig. 1, the present invention is a hydraulic pressurized wireline core drilling tool, which includes an outer tube assembly and an inner tube assembly.

Among them, the inner pipe assembly includes a hinged spear head mechanism 1', a bullet positioning mechanism 2', a reversing valve (hydraulic control reversing valve 3' to be described below) for dredging the flushing fluid, a ball suspension hydraulic plus Pressing mechanism 4', single-acting mechanism 5', inner tube 6' and core claw 7', the bottom of the reversing valve has a core cavity communicated with a group of liquid outlets of the reversing valve, the ball suspension liquid The piston core of the force pressurization mechanism 4' is a tubular piston core with a top seal, and the end of the piston core is located in the heart cavity and forms a sealed pressurized space with the heart cavity, and extends into the reversing valve core cavity. The end of the piston core is provided with a side opening for flushing medium, and another set of liquid outlets of the reversing valve is provided correspondingly to the side opening of the piston core.

When in use, the hydraulic pressurized wireline core drilling tool is connected to the bottom of the drill pipe, and the mud pump provides flushing fluid for the hydraulic pressurized wireline core drilling tool through the drill pipe. During the construction process, the inner pipe assembly is put in, and the flushing fluid is output as the working fluid of the reversing valve. During the construction process, the inner pipe assembly is put in, the mud pump is turned on, and the flushing fluid circulates for the first time. At this time, the working medium passage of a set of reversing valves is opened, and a set of liquid outlets of the reversing valves and the opening on the side of the piston core Connected, the flushing fluid enters the piston core through the reversing valve, and the piston core flows into the flushing medium circulation channel (annular gap between the inner tube assembly and the outer tube assembly) of the hydraulic pressurized wireline coring drill for normal drilling cycle , to carry out circulation drilling; after the normal circulation drilling is completed, the mud pump is turned off; the pump is turned on for the second time to change the direction of the reversing valve, open another group of working medium passages, another group of liquid outlets of the reversing valve and the reversing valve The valve core cavity is connected to guide the flushing fluid into the core cavity of the reversing valve, and push the piston core down. When the piston core goes down, its side opening enters the piston sleeve, so that the top of the piston core forms a sealed water blocking pressurized space for the piston. The core provides a downward driving force for coring. When the piston sleeve reaches the discharge hole of the piston outer cylinder, the liquid flow flows out from the discharge hole, and the drilling is completed. Since the top of the piston core is sealed and only has side openings, when the piston core enters the piston sleeve, a sealed water blocking and pressurizing space is formed on the top of the piston core, and there is no need to throw a ball to achieve sealing, water blocking and pressurizing, thus solving the problem The process brought by the pitching process is cumbersome, the auxiliary time is long, and the degree of automation is low, which brings hidden dangers to the stability of the well wall.

The piston sleeve of the ball suspension hydraulic pressure mechanism is connected to the single-action mechanism, and the side wall of the piston sleeve is provided with a drainage hole for providing circulating drilling flushing medium. The flushing medium entering the piston core flows out from the drain hole of the piston sleeve and enters the flushing medium circulation channel for normal circulation drilling. The piston sleeve and the single-action mechanism of this proposal are directly connected, so that the connection relationship of the hydraulic pressurized wireline core drilling tool here is simple.

As a preferred solution, the reversing valve is a hydraulically controlled reversing valve with a control medium passage for entering the flushing medium and two sets of working medium passages for outputting the flushing medium. With multiple injections of the flushing medium, The hydraulic control reversing valve connects the control medium passage with different working medium passages, so that the secondary washing liquid is output from different liquid outlets, and the valve core moves upward to reset when the control liquid is released.

The hydraulic control reversing valve of this scheme uses the flushing fluid as the control medium of the hydraulic control reversing valve, and outputs the control medium, that is, the flushing fluid, so that the hydraulic control reversing valve can be directly connected to the hydraulic pressurized rope core drill Different flushing liquid circulation can be realized by turning on the pump and injecting flushing liquid, which makes the overall structure of the device simple.

The present invention is illustrated below through a specific embodiment.

As shown in Fig. 3, a structure of a hydraulic control reversing valve is provided. The hydraulic control reversing valve includes two parts, a valve plug connector 60 and a valve seat 80 which are threaded, and the valve plug connector 60 is connected to the upper end of the valve seat 80 through threads. The split structure is convenient for disassembly and installation. It can also be one piece. As shown in FIG. 1 , the valve plug joint 60 is threadedly connected to the end of the cartridge holder 10 of the cartridge positioning mechanism. The valve seat 80 is connected to the lower end of the valve plug connector 60 through threads.

As shown in FIG. 2 and FIG. 4 , the plug joint 60 has a control medium passage composed of a large-diameter liquid inlet 600 , a small-diameter liquid inlet channel 601 and a large-diameter liquid storage chamber 602 . Since the hydraulic pressurized wireline core drilling tool requires a large flow of flushing medium for each pump, in order to supply smoothly, the pump volume should be guaranteed, but in order to form a certain pressure and form a closed pressure with the valve plug of the valve core The liquid chamber and the liquid inlet channel should be smaller. After the valve core is connected to the working medium passage downward, the valve core should be in a state of balanced pressure and small, so a larger diameter liquid storage chamber is arranged under the liquid inlet channel. . Therefore, the above structure is formed.

As shown in Figure 2 and Figure 7, there is a boss on the upper part of the ratchet shaft 100, the thin nut 240 is connected with the ratchet shaft 100 through threads, the valve plug 241 and the spring pressure plate 242 are pressed against the ratchet shaft through the thin nut 100 on the upper part of the boss, the compression spring 243 is sleeved on the ratchet shaft 100 between the spring pressure plate 242 and the valve disc 110, the compression spring can make the valve disc 110 go down and up stably, so as to realize the stable rotation of the valve disc 110 and facilitate Keep the disc 110 balanced.

As shown in Fig. 2 and Fig. 5, the valve seat 80 is a hollow cylinder with six working medium passages evenly distributed in the axial direction, the ratchet shaft 100 is in the center hole 800 of the valve seat 80, and a valve is installed on the head Plug 241, when no flushing medium is injected, the head of the ratchet shaft 100 is located in the liquid inlet channel 601 of the valve plug joint 60, and the valve plug 241 and the liquid inlet channel 601 form a pressure liquid chamber.

As shown in Fig. 2 and Fig. 6, the ratchet sleeve 90 is constrained in the center hole 800 of the valve seat 80, and between the valve seat 80 and the cross projection 802 provided on the upper lip of the ratchet sleeve 90 and the recess of the valve seat port. Slot 803 locates the connection.

As shown in Fig. 2, Fig. 6 and Fig. 7, the ratchet shaft 100 is mutually nested and restrained by the axial spline 1000 at the lower part and the axial spline groove in the ratchet sleeve 90 so that the ratchet shaft 100 can only Sliding cannot rotate circumferentially.

Referring to FIG. 2 again, there is a valve disc 110 at the bottom of the liquid storage chamber 602 . As shown in Figure 8, there is a central hole 1100 on the valve disc 110, and around the central hole 1100 at the bottom of the valve disc, there is a ring of axially downward annular ratchets 1101, which are evenly distributed around the central hole 1100. The structure of three reversing guide holes 1102 , the central hole 1100 of the valve disc passes through the ratchet shaft 100 and is located on the ratchet surface of the ratchet shaft 100 . There is a gasket between the valve seat 80 and the valve disc 110. Another function of the compression spring 243 is: when the flushing liquid circulates, the compression spring 243 mainly uses the stored energy for the contact between the valve disc 110 and the valve seat 80. seal.

Referring to Fig. 6 and Fig. 7 again, the ratchets of the ratchet shaft are formed at the key end of the ratchet shaft, and the ratchets of the ratchet sleeve are formed at the key end of the ratchet sleeve, the number of which is 6, 1001 and 901 respectively. The ratchet wedge angles of the valve disc 110, the ratchet shaft 100 and the ratchet sleeve 90 are equal, and the wedge surfaces are coupled with each other.

The ratchet 1101 of the valve disc 110 is a continuous ratchet, so each tooth corresponds to an angle of 60 degrees. The key width of the ratchet shaft 100 or the ratchet sleeve 90 is half of the ratchet of the valve disc 110 respectively, and the total length is equivalent to the total length of the ratchet of the valve disc 110 . The length of the slope of the ratchet of the valve disc 110 is also twice the length of the slope of the ratchet shaft 100 and the ratchet sleeve 90 .

Referring to Fig. 2 again, there is a return spring 25 in the ratchet sleeve 90, and the return spring 25 is sleeved on the ratchet shaft 100, one end of which is fixed to the ratchet shaft 100, and the other end is limited and fixed by adjusting the pressure plate 81. Centered on the valve seat 80. The return spring is an energy storage reset mechanism.

Referring to Figure 9, taking a ratchet of the valve disc as an example, a ratchet of the valve disc, a ratchet sleeve, and a ratchet of the ratchet shaft engage with each other to realize the process of valve disc rotation:

1. When the pump is not turned on and there is no flushing medium, the tip of a ratchet 1101a slope of the valve disc 110 is at the tip of the left ratchet 901a slope of the ratchet sleeve.

2. Turn on the pump, inject flushing medium, the ratchet shaft 100 goes down, the valve disc 110 goes down, the ratchet 1101a of the valve disc and the left ratchet 901a of the ratchet sleeve engage, and as the valve disc 110 continues to go down along the ratchet The slope of the left ratchet 901a of the gear sleeve goes down, when the tip of the ratchet 1101a of the valve disc 110 passes through half of the slope of the left ratchet 901a of the ratchet sleeve, the valve disc 110 turns 30 degrees at this time, and the valve disc 110 changes The guide hole 1102 communicates with the 1#, 2#, 3# working medium passage inlets, and the flow of liquid balances the force on the valve disc 110, and the valve disc 110 no longer rotates.

3. The pressure of the flushing medium is released (the pressure is released at the ball suspension hydraulic pressure mechanism), the pump is turned off, and the ratchet shaft 100 goes up under the action of the return spring. The ratchet shaft resets, and the top of the ratchet shaft crosses the top of the ratchet sleeve 90 and engages with the ratchet teeth of the valve disc 110. At this time, the tip of the ratchet 1001a of the ratchet shaft is located at the tip of the valve disc ratchet 1101a slope, pushing As the valve disc 110 continues to rotate 30 degrees in the same direction as in the above 2, the valve plug enters the liquid inlet channel of the valve plug joint again, and the hydraulic control reversing valve is closed. Since then, the valve disc 110 has rotated 60 degrees. At this time, the ratchet of the valve disc 110 moves to the right ratchet 901b of the lower ratchet sleeve and repeats steps 1-3 to connect to the next group of valve seat 80 holes, namely 4#, 5# and 6# working medium passage inlets and then Realize commutation.

Referring to Fig. 2, Fig. 10, Fig. 11 and Fig. 12, the ball suspension hydraulic pressure mechanism includes a piston core 20, a piston sleeve 21, a piston outer cylinder 22 and a positioning steel ball 23; the piston core 20 is a ring-shaped A tubular piston core sealed at the top of the groove 200. The piston core 20 is located in the central hole of the piston sleeve 21. The bottom of the valve body of the hydraulic control reversing valve has a heart cavity 30 communicated with a group of working medium passages. The piston core The end of piston core 20 protrudes from the heart cavity 30 of the valve seat 80 of the hydraulic control reversing valve, and the end of the piston core 20 is provided with a side opening for communicating with a group of working medium passages of the hydraulic control reversing valve 201; the middle part of the piston sleeve 21 has four radial circular holes 210, the lower part has drain holes 211, and the lower end is a long pipe body with adjusting threads; the positioning steel ball 23 is located on the diameter of the piston sleeve 21 In the circular hole 210, it can move along the axis of the radial circular hole. The diameter of the positioning steel ball 23 is greater than the length of the radial circular hole 210. The bottom of the piston sleeve 21 has a spring 212 supporting the piston core and a Cover 21 is threaded spring pressure plate, and the spring 212 is set between the inner boss and the spring pressure plate at the bottom of piston core 20; In the relative position, the outer wall of the piston sleeve is also provided with an outer boss to block with the bottom edge of the piston outer cylinder so as to prevent the piston sleeve from coming out of the piston outer cylinder. The piston outer cylinder 22 is set outside the piston sleeve 21, and there is an annular groove 220 at the upper center of the inner wall of the piston outer cylinder 22, which is used for positioning the steel ball 23. There are four discharge holes 221 at the middle and lower parts, and an inner boss at the bottom .

The working principle of the hydraulic pressurized wireline core drilling tool is: during construction, the mud pump is connected to the control medium passage inlet of the hydraulic control reversing valve. Turn on the mud pump (when mud is used as the flushing medium), the mud circulates for the first time, the valve disc blocks the valve seat 80, the curved channel 806 opens the straight channel 805, and the liquid flows through the side opening of the piston core 20 of the ball suspension hydraulic pressure mechanism 201 flows into the inside of the piston core 20, and then enters the flushing medium circulation channel for normal circulation drilling; when the normal circulation drilling is completed, the mud pump is turned off, the energy storage reset mechanism drives the valve core upward, and the valve disc rotates along the valve core to close the control medium passage and The communication of the working medium passage; the pump is opened for the second time, the valve disc goes down to block the straight channel 805 and opens the curved channel 806, the liquid flows into the valve seat 80 and the heart cavity 30, the piston core 20 is compressed, and the positioning steel ball 23 moves along the annular groove of the piston core 20. The axis of the drilling tool moves, the ball is suspended and unlocked, and the high-pressure liquid flows to compress the piston core 20 and the piston sleeve 21 to drive the lower mechanism of the inner tube assembly to go down together. The top of the core forms a sealed, water-blocking and pressurized space, which drives the core claws to retract. When the piston sleeve 21 descends to the discharge hole 221 of the piston outer cylinder 22, the liquid flows out from the discharge hole 221, and the drilling is completed.

It can be known from the above introduction that the valve disc 110 and the ratchet sleeve 90 are engaged by the first set of ratchet mechanism when the ratchet shaft 100 goes down in the present invention, and the first set of ratchet mechanism rotates the valve disc 110 by an angle so that the valve disc 110 The reversing guide hole 1102 of the valve communicates with at least one working medium passage inlet. When the ratchet shaft 100 goes up, the valve disc 110 and the ratchet shaft 100 are engaged by the second set of ratchet mechanisms, and the second set of ratchet mechanisms makes the valve disc 110 again Rotate an angle so that the reversing guide hole of the valve disc 110 and the inlets of all working medium passages are staggered to realize the closing of the working medium passages.

The number and arrangement of the reversing through hole, the ratchet of the valve disc 110 , the ratchet of the ratchet shaft 100 and the ratchet of the ratchet sleeve 90 are specifically set according to the situation.

A ratchet mechanism has been described in detail in the above-mentioned embodiments. In fact, other forms of ratchet mechanisms can realize that when the hydraulic control reversing valve injects the control medium, the reversing mechanism rotates the valve disc so that the control medium The channel and the working medium channel are connected, and when the pressure is released to flush the medium, the function of the reversing mechanism to rotate the valve disc so as to disconnect the control medium channel and the working medium channel is within the protection scope of the present invention.

The valve discs 110 shown in the figures of the present invention are all circular discs, and may also be fan-shaped discs or the like.

The hydraulic control reversing valve of the present invention is a kind of hydraulic control reversing valve that outputs the control liquid, and generally moves the valve core axially to drive the plug on the valve core to block different liquid inlets and outlets to achieve reversing The valve hydraulic control reversing valve also has the following advantages:

1. The flushing medium is not only used as a control fluid but also as a working fluid output. Compared with the existing ordinary hydraulic control reversing valve in which the control fluid and the working fluid are completely separated, there is no need for a separate control fluid, which saves energy;

2. There is no need for absolute sealing between the control fluid passage and the working fluid passage, and the process requirements are low;

3. The control liquid passage does not need a return passage, and the structure is simple.

The above is only a preferred embodiment of the present invention, it should be pointed out that, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications can also be made. It should be regarded as the protection scope of the present invention.

Claims (10)

1. fluid power adding pressure type cord coring drill, its inner tube assembly comprises that ball hangs the fluid power pressing mechanism, it is characterized in that: described inner tube assembly also comprises be used to the reversal valve of dredging flushing liquor, the bottom of described reversal valve has one group of chambers of the heart that liquid outlet is communicated with reversal valve, the piston core that described ball hangs the fluid power pressing mechanism is the tubular piston core of end sealing, the end of described piston core is positioned at the described chambers of the heart and the described chambers of the heart forms the sealing pressing space, and be provided be used to the STH that advances scouring media another group liquid outlet of described reversal valve and the corresponding setting of STH of described piston core in the described piston core end that puts in the reversal valve chambers of the heart.

2. fluid power adding pressure type cord coring drill according to claim 1, it is characterized in that: described inner tube assembly also comprises single action mechanism, the piston bush that described ball hangs the fluid power pressing mechanism be connected single action mechanism and connect, be provided be used to providing circulation to creep into the drain hole of scouring media at the sidewall of described piston bush.

3. fluid power adding pressure type cord coring drill according to claim 1 and 2, it is characterized in that: described reversal valve is to have one to be used to into the control medium path of scouring media and to be used for the pilot operated directional control valve of two groups of working media paths of output scouring media, along with repeatedly injecting scouring media, described pilot operated directional control valve makes described control medium path be communicated with different working media paths, thereby make the output from washing lotion from different liquid outlet, and when the pressure release of control liquid horizontal reset on the spool.

4. fluid power adding pressure type cord coring drill according to claim 3, it is characterized in that: described pilot operated directional control valve comprises valve body and spool;

In described valve body, have: described control medium path; Described two groups of working media paths; Described spool is positioned at the axis hole of described valve body, and it is stifled that the spool head is equipped with a valve, and described valve is stifled to form the sap cavity of exerting pressure with the control medium path, thereby it is descending to promote described valve disc; One flexible drive mechanism, described flexible drive mechanism are connected between the stifled and valve disc of described valve, are used for promoting described valve disc when injecting control medium descending; One has the valve disc of centre bore, is provided with the commutation via at described centre bore periphery, and valve disc is set on the spool between working media path and the control medium path; One energy storage resetting-mechanism, energy storage when injecting control medium, to promote described spool up thereby release during the pressure release scouring media; And a changement, repeatedly injecting scouring media, described changement makes described control medium path be communicated with different working media paths and horizontal reset on the spool when the pressure release of control liquid.

5. fluid power adding pressure type cord coring drill according to claim 4, it is characterized in that: described changement is: comprise being installed in the described valve body, being sleeved on the outer valve pocket of described spool, the first set ratch mechanism is housed between described valve disc and the valve pocket, the second cover ratch mechanism is housed between described valve disc and the spool;

When injecting control medium, valve disc and valve pocket drive described valve disc and are rotated in the forward by the interlock of first set ratch mechanism, thereby described control medium path and working media path are connected; During the scouring media pressure release, valve disc and spool drive horizontal reset on the described spool by the second cover ratch mechanism interlock.

6. fluid power adding pressure type cord coring drill according to claim 5, it is characterized in that: the bottom part ring of described valve disc is provided with axially downward annular ratchet of a circle around described centre bore, valve pocket is that inner circumferential surface is provided with axially the make progress ratchet cover of annular ratchet of a circle, and the ratchet of described valve disc and ratchet cover forms the first set ratch mechanism; Described spool is for being provided with axially the make progress ratchet axle of annular ratchet of a circle at its outer peripheral face, the ratchet of the ratchet of described valve disc and described ratchet axle forms described the second cover ratch mechanism; Described ratchet cover and the valve body of being connected are circumferentially, axial location connects, and described ratchet axle overlaps with respect to ratchet circumferentially to be located, be in axial sliding connection; Wherein said valve disc, ratchet axle and ratchet cover three's ratchet all is chisel teeths, and three's key groove equates, lozenges intercouples, and the ratchet inclined-plane of ratchet axle and ratchet cover is at homonymy.

7. fluid power adding pressure type cord coring drill according to claim 6 is characterized in that: described ratchet axle is connected axial splines with the ratchet cover is connected connection with spline.

8. fluid power adding pressure type cord coring drill according to claim 7, it is characterized in that: the ratchet of described ratchet axle is formed on the key end of described ratchet axle, and the ratchet of described ratchet cover is formed on the key end of described ratchet cover.

9. fluid power adding pressure type cord coring drill according to claim 6 is characterized in that: the cross projection by being located at ratchet cover upper lip between described ratchet cover and the valve body and the groove of valve body port are located by connecting.

10. fluid power adding pressure type cord coring drill according to claim 6, it is characterized in that: described energy storage resetting-mechanism is the back-moving spring in the ratchet cover, described back-moving spring is set on the described ratchet axle, and one end and ratchet axle are fixed, and the other end connects plugging part.

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