RU2318111C1 - Downhole hydraulic deflecting unit - Google Patents

Abstract

FIELD: oil production, particularly devices to be inserted in multilateral well offshoot.

SUBSTANCE: unit comprises body 1 with pin 2, central through channel 3, spherical recess 4 and inner groove 5 located in central part thereof. Spring-loaded piston 7 with technological groove 8 formed in outer surface thereof and with rod 9 is air-tightly inserted in inner groove. The rod has central through channel 10 and beveled lower end 11. Unit also has deflecting head 12 with semi-sphere 13 in upper part thereof. The head 12 rotatingly and slidably cooperates with lower part of spherical recess 4. Upper semi-sphere plane 14 may be in contact with beveled lower end 11 of piston 7 rod 9 as piston moves downwards. Pin 2 may cooperate with groove 8 created in piston. Piston 7 is rotatingly inserted in the body 1. Deflecting head 12 is spring-loaded from body 1. Technological groove 8 is made as longitudinal slots alternately directed upwards and downwards and connected with each other through figured slot so as piston reciprocates relatively body pin serially cooperates with each slot.

EFFECT: provision of deflecting head rotation through precise angle, increased simplicity of unit insertion in well offshoot and elimination of repeated works, simplified structure, decreased costs and possibility of unit operation in horizontal directional and horizontal wells.

2 dwg

Description

The invention relates to the oil industry, in particular, to devices for entering the lateral shafts of a multilateral well.

It is known “Device for delivering an object to the lateral barrel of a multilateral well” (patent RU No. 2142559, ЕВВ 47/01, published in Bull. No. 33 of 11/24/1997) with a rotation mechanism and a lower directional movement mechanism made in in the form of a guide pipe interacting with an elastic element mounted on the device’s case, while the guide pipe with its upper end is pivotally connected to the object, and the lower end - connected to the disconnect lock, in addition, a spring-loaded slider is installed in it, the end surface of which forms upper inclined surface.

The disadvantages of this device are a large number of small, difficult to manufacture mating parts and, as a result, the high cost and low reliability of the entire product as a whole, the ability to rotate the device only from the wellhead, which reduces the accuracy of rotation by a certain angle in view of the twisting of the pipe string, which the device descends.

The closest in technical essence and the achieved result is “Hydraulic Curve Sub” (see page 159, Beker Oil Tools Catalog, Product Services Version 5.0, “Fishing Services”, 163 pages), consisting of a housing with a pin, a central a passage channel, a lower spherical sampling and an internal groove in the middle part, into which an axially spring-loaded piston with a longitudinal technological groove on the outer surface and with a rod equipped with a central passage channel and a lower oblique cut is inserted with axial movement downward, a deflecting head with a hemisphere on top, sealingly cooperating pivotable and deviations from a spherical sample body, the upper plane of the hemisphere of the deflecting head is adapted to cooperate with an oblique cut of the piston rod as it moves downward, and the housing pin is arranged to engage with the process bore of the piston.

The disadvantages of this device are:

- lack of fixation of the deflecting head during descent, which can cause unauthorized deviation of it down, which excludes its performance in horizontally-deviated and horizontal wells;

- the ability to rotate the device only from the wellhead, which reduces the accuracy of rotation by a certain angle in view of the twisting of the pipe string on which the device descends.

The technical task of the proposed hydraulic borehole deflecting unit is to simplify and reduce the cost of the device, expand its functionality by working in horizontally-deviated and horizontal wells, as well as ensuring accurate rotation of the deflecting head itself at a given angle.

The technical problem is solved by a hydraulic borehole deflecting unit, comprising a housing with a pin, a central passage channel, a lower spherical sampling and an internal groove in the middle part, into which an upward-loaded spring-loaded piston with a technological groove on the outer surface and with a rod equipped with a central a passage channel and a lower oblique cut, and a deflecting head with a hemisphere at the top, hermetically interacting with the possibility of rotation and deflection in a spherical a small sample of the housing, the upper plane of the hemisphere of the deflecting head made with the possibility of interaction with the lower oblique cut of the piston rod when moving down, and the pin of the housing is made with the possibility of interaction with the technological groove of the piston.

What is new is that the piston is rotatably inserted into the housing, and the deflecting head is spring-loaded from the housing, while the technological groove of the piston is made in the form of longitudinal grooves directed sequentially up and down, connected by a figured groove so that when the piston is reciprocated relative to The body pin sequentially interacts with each of them.

Figure 1 shows a deflecting unit in longitudinal section.

Figure 2 shows the technological groove of the piston.

The hydraulic downhole deflecting unit consists of a housing 1 with a pin 2, a central passage channel 3, a lower spherical selection 4 and an internal groove 5 in the middle of the housing 1.

A piston 7, spring-loaded by means of a spring 6, is inserted into the inner groove 5 in the middle part of the housing 1 and axially moved downward by a spring 6 and has a technological groove 8 on the outer surface and with the rod 9. The rod 9 is equipped with a central passage channel 10 and a lower oblique cut 11.

The hydraulic borehole deflecting unit also contains a deflecting head 12 with a hemisphere 13 at the top, hermetically interacting with the possibility of rotation and deflection with a spherical sample 4 of the housing 1.

The upper plane 14 of the hemisphere 13 of the deflecting head 12 is configured to interact with the lower oblique cut 11 of the rod 9 of the piston 7 when moving down. The pin 2 of the housing 1 is made with the possibility of interaction with the technological groove 8 of the piston 7.

The piston 7 is rotatably inserted into the housing 1, and the deflecting head 12 is spring-loaded from the housing 1. The deflecting head 12 is spring-loaded relative to the lower end of the housing 1 by means of a spring 15.

Technological groove 8 of the piston 7 is made in the form of longitudinal grooves directed sequentially upwards 16 and down 17, connected by a figured groove 18 so that when reciprocating the piston 7 relative to the housing 1, the pin 2 sequentially interacts with each of them.

Below the deflecting head 12 is equipped with a nozzle 19 with holes 20.

Unauthorized fluid flows during operation of the device are eliminated by the sealing elements 21, 22, 23.

Hydraulic downhole deflecting unit operates as follows.

The hydraulic downhole deflector assembly (see FIG. 1) is connected to a flexible pipe (not shown in FIGS. 1 and 2) and lowered into a multilateral well.

In the interval of the alleged location of the lateral bore of the multilateral well in the flexible pipe and, accordingly, inside the hydraulic borehole deflecting unit, hydraulic pressure is created, which increases due to the high flow rate of the liquid due to the hydraulic resistance of the piston 7, as well as the small cross-sectional area of the holes 19 of the nozzle 20.

As a result, the piston 7 with the rod 9, compressing the spring 6, moves downward, while the piston 7 relative to the inner groove 5 in the middle part of the housing 1 rotates due to the fact that the pin 2, rigidly fixed in the housing 1, moves along the technological groove 8 piston 7 from a groove 17, longitudinally directed downward (see FIG. 2) through a shaped groove 18 into a groove 16, longitudinally directed upward, at a strictly defined angle, which is set in advance by the number of technological grooves 16 and 17 longitudinally directed up and down 8 of the piston 7. In this case, the lower oblique slice 11 of the rod 9, due to the rotational-axial movement downward of the latter, acts on the upper plane 14 of the hemisphere 13 of the deflecting head 12. This leads to the fact that the deflecting head 12 with the hemisphere 13 at the top, hermetically interacting by means of a sealing element 22 with the possibility of rotation and deviation in the spherical sample 4 of the housing 1, rotates towards the side wall of the multilateral well, compressing the spring 15, and enters the side trunk of the multilateral well, fixing the device in the side om a multilateral wellbore. The descent of the flexible pipe into the multilateral well is continued with the simultaneous supply of fluid into the flexible pipe, while the hydraulic borehole deflecting unit moves in the lateral shaft, and the fluid from the flexible pipe through the central passage 10 of the rod 9 and the central passage 3 of the housing 1 through the central hole 24 of the deflector the head 12 and the holes 19 of the nozzle 20 enters the side shaft, washing it.

Having reached the bottom of the side table of a multilateral well, the descent of the flexible pipe is stopped without relieving pressure, the bottom hole zone (SCR) of the side trunk of the multilateral well is treated with chemical reagents, and the nozzle 19, which is rigidly fixed to the lower end of the deflecting head 12, directs a stream of liquid into multilateral wellbore.

At the end of barrel processing, the pressure in the flexible pipe and, accordingly, in the device is relieved. As a result, the piston 7 with the rod 9 is moved back due to the return force of the spring 6, while the rod 9 comes out of interaction with the lower oblique cut 11 of the rod 9 and is pulled into the housing 1, occupying the initial position (see figure 1). In addition, the deflecting head 12 is aligned coaxially with the housing 1 due to the return force of the spring 15, which is expanded. At this moment, the pin 2, rigidly fixed in the housing 1, moves along the technological groove 8 of the piston 7 from the longitudinally directed upward groove 16 (see FIG. 2) through the shaped groove 18 into the longitudinally directed downward groove 17. After that, the hydraulic borehole deflecting unit with flexible pipe (see figure 1) is removed first from the lateral trunk of a multilateral well, and then completely raised to the surface. If it is necessary to process another side trunk of a multilateral well, the hydraulic borehole deflecting unit with a flexible pipe is removed only from the previous side trunk of the multilateral well and the operations described above are repeated.

The proposed hydraulic downhole deflecting unit has a simple design, low cost, and the expansion of its functionality is associated with the possibility of its operation in horizontal-deviated and horizontal wells. In addition, it provides an accurate rotation directly of the deflecting head itself at a predetermined angle, which greatly facilitates getting into the lateral barrel of a multilateral well and avoids repeated work.

Claims (1)

A hydraulic borehole deflecting unit including a housing with a pin, a central passage channel, a lower spherical sampling and an internal groove in the middle part, into which an upward-loaded spring-loaded piston with a technological groove on the outer surface and with a rod equipped with a central passage channel and inserted lower oblique cut, and the deflecting head with a hemisphere at the top, hermetically interacting with the possibility of rotation and deviation in a spherical sample of the body, and the upper plane of the hemisphere of the deflecting head is configured to interact with the lower oblique cut of the piston rod when moving down, and the housing pin is configured to interact with the technological groove of the piston, characterized in that the piston is rotatably inserted into the housing and the deflecting head is spring loaded from case, while the technological groove of the piston is made in the form of longitudinal grooves directed sequentially up and down, connected by a figured groove so that upon return a translational movement of the piston relative to the housing pin consistently interacts with each of them.

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