SU1594267A1 - Downhole equipment for washing and isolating annulus and tube space - Google Patents

Abstract

The invention relates to the oil and gas industry and is intended for the exploitation of oil and gas wells. The goal is to increase operational reliability while increasing the washing efficiency by ensuring complete replacement of the mud in the area under the shank. The equipment contains a tubing string 1, the lower end of which is connected to a landing nipple 2 sequentially installed under it and connected to each other, with a slam-shut valve 3 placed in it, hydraulically connected by means of a pulse pipe 4 to the ground control station of the emergency valve 5 plugging, downhole chamber 6, with valve 7 and 8 of column 9, seal 10, disconnector 11 with shank 12. Between the landing nipple 2 and valve 5 there is a telescopic connector / TC / 13 for axial movement valve 5, borehole chamber 6 with valve 7, 8, column 9, seal 10 and disconnector 11 with shank 12. At this seal 10 in the lowest position is installed with the possibility of tight interaction with disconnector 11. The whole complex of equipment is lowered into the well 10 into a stationary disconnector 11. Then, the entire complex is raised to a height equal to half the stroke of the vehicle 13 and fixed to the mouth. After this, rinsing, replacement of the clay solution is performed. Then, after calling the oil inflow, the cable technology tool knocks the shear screws of the TS 13. At the same time, the entire set of equipment located below the TS 13 falls down under its own weight. The seal 10 is included in the disconnector, providing reliable sealing of the annular and in-line space. Further, during operation, the oil rises through the tubing string 1. 4 or less.

Description

-W

the next

4 S

ON XI

pump-compressor pipes 1, the lower end of which is connected to successively installed under it and connected with each other nipple 2, with a shut-off valve 3 located therein, hydraulically connected by means of impulse pipe A to the ground station of control of emergency killing valve 5, chamber b with valves 7 and 8 of column 9, seal 10, disconnector 11 with shank 12. Between the seating nipple 2 and valve 5 there is a telescopic connector (TC) 13, for axial movement of valve 5, downhole chamber 6 with valves 7.8 of column 9, seal 10 and disconnector 11 with shank 12. With seal 10 in the lowest position, it is installed to interact tightly with disconnector 11. The entire set of equipment is lowered into the well until seal 10 stops in stationary disconnector 11. Then raise the entire complex to a height equal to half the stroke of the vehicle 13 and secured to the mouth. After this, rinsing, replacement of the clay solution is performed. Then, after calling the oil inflow, the cable technology tool knocks the shear screws of the TS 13. At the same time, the entire set of equipment located below the TS 13 falls down under its own weight. The seal 10 is included in the uncoupler, providing reliable sealing of the annular and in-line spaces. Further, during operation, oil rises through the column of compressor tubing 1. 4 il.

The invention relates to the oil and gas industry and is intended for use in the operation of oil and gas wells equipped with stationary disconnectors and anchor seals.

The purpose of the invention is to increase its operational reliability while increasing the washing efficiency by ensuring complete replacement of the mud solution in the area under the shank.

FIG. 1 shows a diagram of a downhole equipment with a telescopic connection in the upper position, providing replacement of the mud; in fig. 2 - the same, in the lower position, ensuring the separation of zones annular and in-line spaces; in fig. 3 - telescopic connection in a position that provides the replacement of the mud, a general view; in fig. 4 - the same, in the position providing the axial movement of the equipment and separation of the annular and intratubal spaces.

Borehole equipment for flushing and disconnection of the annular and in-tubular spaces contains a column of pump-compressor pipes 1, the lower end of which is connected to sequentially installed under it and connected. between them, a landing nipple 2 with a shut-off valve 3 dis- placed in it, hydraulically connected by means of a pulse tube 4 to a ground control station, an emergency jamming valve 5, a downhole chamber 6 with an inlet valve 7, and a circulating valve 8 , a column 9 disconnector, an anchor seal-10 and an uncoupler 11 with an ostovik 12. In addition, the drilling equipment is equipped with

between the post nipple 2 and the valve 5 of the emergency jamming telescopic joint 13 for axial movement of the valve 5 of the emergency jamming of the borehole chamber 6 with the inhibitory valve 7,

the circulation valve 8, the disconnector of the column 9, the anchor seal 10 and the disconnector 11 with the shank 12, and the anchor seal 10 in the lowest position is set to

tight interaction with disconnector 11 for isolating the annular and in-well spaces. The impulse tube 4 is attached to the column of pump-compressor pipes 1 with clamps 14

with buckles 15.

The telescopic connection 13 (Fig. 3) consists of a head 16 and a housing 17 connected to a cylinder 18. O-rings 19 are placed inside the housing 17, and

the outer side of the radial hole set tube 20.

The tightness of the threaded connections of the housing and the cylinder 18 is ensured by sealing rings 21.

Inside the cylinder 18 is placed the holder 22, which is connected in the upper part

with support nut 23, and below with stem

24. Inside the holder 22 is placed the sleeve

25, which is held in the upper position with shear screws 26.

The sleeve 25 has an upper collar a, a lower collar b and a hole c. In the holder 22, a hole g is made, insulated from the inner hollow of the telescopic joint of the relative rings 27. In the lower part of the holder 22, slots A are made, and in the upper part of the body 17 there are counter projections e which, when interacting, form a spline joint and provide the torsional moment.

The same spline connection g is formed when the housing 17 interacts with the sub 28 connected to the lower end of the barrel 24.

Spline joints provide the transmission of torque in the position of replacement of the mud, and the spline joints in the position of separation of the annular and in-tube spaces.

When the cylinder is positioned behind (Fig. 3), a hydraulic chamber 3 is formed between the barrel 24 and the cylinder 18, which through the plug 20 is pre-filled with an incompressible fluid (oil) 29, thereby ensuring the transport position of the telescopic joint 13.

The distance from the telescopic joint 13 to the anchor seal 10 is determined from the condition of providing the total weight of free-falling pipes and well equipment located under the telescopic joint 13. and from the condition of providing the force required to operate the telescopic joint 13 and the anchor seal 10.

Telescopic connection 13 (Fig. 3 and 4) works as follows.

The equipment is lowered into the well up to the stop of the anchor seal 10 (Fig. 16) into the stationary disconnector 11, then the layout is raised to a height equal to half the stroke of the telescopic joint 13, after which the Christmas tree fittings are installed and wired. After that, the solution is replaced with water. those. flushing and development of wells, call flow (Fig. 1, the direction of the arrow). Then the tool of the cable technician strikes down (Figs. 3 and 4) the screws 26 and the telescopic sleeve 25 moves to the lower position (Fig. 4). In this case, taking into account the displacement of fluid from chamber 3 through the holes in and out of the equipment located below (Fig. 1) 3, the telescopic connection 13 goes down under its own weight. The anchor seal 10 is connected to the stationary disconnector 11 and hermetically separates the zones of the annular and in-line 3 spaces (Fig. 2).

In case of malfunctions of the equipment located above the anchor seal

0

10. The tubing string 1 with the equipment is disconnected from the anchor seal 10, is lifted to the surface through the switch disconnector 9 and re-connected after elimination of the defect. Telescopic connection has a stroke of 500-1000 mm (Fig. 2 and 4).

If, however, a seal up to 500 mm is required to uncouple the seal 10 (Fig. 1), then the rest of the stroke is necessary to compensate for the temperature lengthening of the tubing string,

If it is necessary to transmit the torque through the telescopic connection, it is sufficient to provide tension or unloading of the pipes 1. At the same time, the splined connections are respectively hooked up by the interaction of the slots g and the protrusion e or splined connections g.

In order to protect the equipment from corrosion or from paraffin and scaling during operation, various inhibitors are introduced through the inhibitor valve 7 into the annulus.

During well operation, the controlled shut-off valve 3 is kept in an open state from the control panel through the impulse pipe 4. In the event the well pressure at the wellhead from the set (increase or decrease), as well as when a fire hazard occurs, the pressure in the impulse pipe 14 instantaneously decreases and the shut-off valve 3 hermetically closes the wellbore, preventing emergency situations.

To remove the equipment, it is necessary to separate the anchor seal 10 from the stationary disconnector 11. This is achieved by rotating the tubing string — when the spline joints are connected.

The proposed equipment arrangement provides flushing of the well, complete replacement of the mud through the shank, increases operational reliability and provides savings by reducing the time required for completion of the wells.

Claims (1)

Borehole equipment for flushing and disconnection of the annular and intratubular spaces, containing a tubing string, the lower end of which is connected to the fitting nipple sequentially installed underneath and interconnected by means of a shut-off valve located in it. tubes with ground control station., emergency stop valve. a borehole chamber with an inhibitory valve, a circulation valve, a column disconnector, anchor seal and disconnector with a shank characterized in that. what. in order to increase its operational reliability while increasing the effectiveness of flushing by ensuring complete replacement of the mud in the area under the shank, it is equipped with a valve located between the landing nipple and the emergency valve .1 Fi.Z nor a telescopic connection for the axial movement of the emergency plug valve, the borehole chamber with the inhibitor valve, the circulation valve, the column disconnector, the anchor seal, and the disconnector with the shank, the anchor seal in the lowest position installed with the possibility of tight interaction with the uncoupler for isolating and borehole in-line spaces. phage. (