RU2656644C1 - Formation testing device - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: invention relates to the wells geophysical exploration, in particular to the oil and gas wells production horizons testing, as well as superdeep and horizontal wells. Formation testing device comprises cylindrical housing consisting of upper, middle and lower housing parts, rod with the splined connection concentrically mounted in the cylindrical housing, equipped with the collar with o-rings, below which radial openings are made, inlet valve, spool bushing is telescopically connected to the additional rod and is installed with possibility of axial movement during the pipe string rotation, additional rod, on which outer surface endless helical groove is made, in which bracket is arranged, rigidly connected to the pin located directly in the cylindrical housing middle part, additional rod is mounted movably relative to the rod with splined connection and cylindrical housing, additional intake valve consisting of the pressure relief valve and located in the cylindrical housing differential bushing, equalization valve, thrust bearing installed between the cylindrical housing and the adapter. Upper housing part is made detachable, the spool bushing is equipped with restrictive nut, spool bushing and the additional rod telescopic connection is made by means of the upper and lower sleeves with the collars, bracket is fixed with the adjusting screw.

EFFECT: invention allows to perform testing of the high-yield wells, as well as superdeep and horizontal wells of different diameters.

1 cl, 3 dwg

Description

The invention relates to geophysical exploration of wells, in particular to testing the productive horizons of oil and gas wells, as well as ultra-deep and horizontal wells.

A device for testing formations is selected, selected as an analogue, comprising a housing, a hollow, plugged in the lower part of the rod with inlet channels and conjugated with right and left threads on its outer surface, a bracket with a finger mounted on the rod, a sleeve telescopically connected to it with radial channels, and the sleeve is connected to the stem by a keyed connection (USSR author's certificate No. 1105630, publ. 07/30/1984).

The disadvantages of the known device are: low manufacturability and margin of safety of the upper part of the device, the complexity of disassembly, significant labor costs for the manufacture and assembly of the device.

A device for testing formations is selected, selected as a prototype, containing a finger installed in the housing and closed from external influences by a sealing cylinder, a bracket sliding along an infinite helical groove of an additional hollow rod, which interacts through a telescopic connection with the spool sleeve of the intake valve and is movably mounted relative to case and rod with a spline connection, having in the middle part a shoulder with radial holes. Moreover, the rod with a spline connection is mounted movably and the differential sleeve is sealed (patent No. 2186967, publ. 10.08.2002).

The disadvantages of the known device are: low margin of safety of the upper part of the device, the complexity of disassembling the device, the ability to move the spool sleeve below the inlet valve and the non-alignment of the radial holes of the inlet valve, low adaptability of the device, design complexity, significant labor costs for the manufacture and assembly of the device, the risk of lapel middle and lower body parts of the device, a short period of operation, the problem of driving sand into a blind channel between the casing and the cylindrical body mustache.

The problem solved by the invention is to increase the margin of safety of the upper part of the device and facilitate disassembly of the device, preventing the spool sleeve from moving below the inlet valve and ensuring matching radial holes of the inlet valve, increasing the manufacturability of the device and simplifying the design, reducing labor costs for manufacturing and assembling the device, reducing risk lapel of the middle and lower body parts of the device, increasing the duration of operation and increasing reliability ix sand plugging problems in the hollow passage between the casing and the cylindrical body.

The specified technical result is achieved by the fact that:

- the upper body part is detachable, the spool sleeve is equipped with a restrictive nut, the telescopic connection of the spool sleeve and the additional rod is made using the upper and lower sleeves with collars, the bracket is fixed with an adjusting screw;

- the pressure reducing valve consists of a seat, support, stem, spring and roller.

Improving manufacturability, increasing the margin of safety and facilitating disassembly of the device is possible due to the implementation of the upper housing part detachable.

Preventing the spool sleeve from moving below the inlet valve and ensuring that the radial openings of the inlet valve are aligned is achieved by placing a stop nut on the spool sleeve.

Simplification of the design of the device is achieved through the implementation of a telescopic connection of two sleeves having collars and interconnected by a threaded connection.

Reducing labor costs for the manufacture and assembly of the device is achieved by placing the adjusting screw directly in the finger, which allows the fitting of the clamp to the screw groove of the additional rod.

Reducing the risk of flap of the middle and lower case parts of the device is due to the placement of the screw between the middle and lower case parts.

Increasing the duration of operation and improving the reliability of the device is achieved by equipping an additional inlet valve, consisting of a seat, support, stem, spring, roller.

Elimination of the problem of driving sand into the blind channel between the casing and the cylindrical body of the device is achieved by eliminating the casing from the device structure.

The scheme of the device for testing the formation shown in figures 1, 2, 3.

The formation testing device consists of a cylindrical body including an upper body part (not shown), an average 1 (Fig. 1) and lower 2 (Fig. 2) body parts, a rod with a spline connection (not shown), consisting of upper 3, middle 4 and lower 5 (Fig. 3) parts, an inlet valve (not shown), including a spool sleeve 6 (Fig. 1) and a clip 7, an additional rod 8 (Fig. 2), staples 9 (Fig. 1), a finger 10, bushings 11 (FIG. 2), an additional inlet valve (not shown), including a pressure reducing valve (not shown) and differential sleeve 12 (f ig. 2), balancing valve (not shown), including the middle part 4 of the rod with a spline connection, sleeve 13 and lower 2 body part, thrust bearing, including metal ring 14 (Fig. 3), fluoroplastic or rubber ring 15, sleeve 16 , restrictive nut (not shown), upper 17 (Fig. 1) and lower 18 sleeves with collars, adjusting screw 19, pin 20 (Fig. 2). The upper body part of the cylindrical body is made detachable and consists of the upper 21 (Fig. 1) and the lower 22 elements fixed with a screw 23. The pressure relief valve consists of a seat 24 (Fig. 2), a support 25, a rod 26, a spring 27 and a roller 28.

An adapter (not shown) is made in the upper element 21 (Fig. 1) of the body part, which serves to connect the formation testing device to the pipe string (not shown) or other parts of the test equipment.

The restrictive nut (not shown) is mounted on the spool sleeve 6 (Fig. 1), made with the possibility of axial movement during rotation of the pipe string.

The spool sleeve 6 with radial holes (not shown) and the cage 7 with radial holes (not shown) form an inlet valve, which is designed to allow access to the formation fluid into the drill string above the device and is controlled by rotation of the pipe string. The clip 7 is rigidly connected to the lower element 6 of the housing part and is closed by a plug 29 from above.

The telescopic connection of the spool sleeve 6 (Fig. 1) and the additional rod 8 is made using the upper 17 and lower 18 sleeves having collars (not shown) and interconnected by a threaded connection.

An additional rod 8 (Fig. 2) is movably placed in the middle case 1 (Fig. 1) of the cylindrical body and has an infinite helical groove (not shown) on the surface, which is a right and left trapezoidal thread with mating ends cut in one section. In the endless helical groove there is a bracket 9 (Fig. 1), rigidly connected to the finger 10, which is located directly in the middle case part 1 of the cylindrical case. The bracket 9 is fixed with an adjusting screw 19 with the possibility of adjusting the pressing force to the endless helical groove of the additional rod 8, in the upper part of which a restrictive nut 30 is placed.

Between the additional rod 8 and the middle body part 1 of the cylindrical body there is a sleeve 11 (Fig. 2), in which grooves (not shown) are made, included in the pins 31, connecting the sleeve 11 with the upper part 3 of the rod with a spline connection and serving to prevent rotation additional rod 8 relative to the rod with a spline connection concentrically mounted in a cylindrical body and consisting of upper 3 (Fig. 2), middle 4 and lower 5 (Fig. 3) parts that are rigidly connected to each other by a threaded connection.

In the upper part 3 (Fig. 2) of the rod with a spline connection, a piston 32, a sleeve 33, and a collar 34 with sealing rings 35 are placed below which radial holes (not shown) are made. Burt 34, if necessary, can be made detachable or integral with the main rod, while the cross-sectional area of the collar 34 in its sealing part is twice the cross-sectional area of the upper part 3 of the rod with a spline connection.

The pin 20 (Fig. 2) is placed in the piston 32 and serves to fix the piston 32 in the housing part 2. The screw 36 serves to reduce the risk of flap middle 1 (Fig. 1) and lower 2 (Fig. 2) of the device body parts.

The additional inlet valve consists of a differential sleeve 12 (Fig. 2), radial holes (not shown) made in the upper 3 and middle 4 parts of the stem with a spline connection, and a pressure reducing valve used to regulate pipe and reservoir pressures and consisting of a seat 24 , supports 25, rod 26, springs 27 and roller 28. Through an additional inlet valve, the cavity of the device is filled with formation fluid.

The function of the spacers is performed by a differential sleeve 12 (Fig. 2), made with the possibility of pairing its inner surface with the outer surface of the collar 34, and the sleeve 13 with the ring 37 mounted on the middle part 4 of the rod with a spline connection.

The middle part 4 (Fig. 2) of the spline stem, sleeve 13, the lower body part 2 (Fig. 3) of the cylindrical body and radial holes (not shown) form a balancing valve, which serves to provide hydraulic communication between the under-packer and over-packer spaces. The equalizing valve operates from axial movement of the rod with a spline connection relative to the cylindrical body.

In the lower part 5 (Fig. 3) of the rod with a spline connection between the end face (not shown) of the cage 38 connected to the body part 2 of the cylindrical body and the end face (not shown) of the sub 39, a thrust bearing is installed, consisting of metal 14, fluoroplastic or rubber rings 15 and bushings 16.

The rotation of the lower part 5 (Fig. 3) of the rod with a spline connection with respect to the lower body part 2 of the cylindrical body is prevented by the spline connection connecting the lower part 5 of the rod and the cage 38 installed in the body part 2 of the cylindrical body.

The sub 39 (Fig. 3) is designed to connect the device for testing the formation with a string of pipes (not shown) or other parts of the test equipment.

Sealing of movable and fixed joints is carried out with rubber rings 40-49 (Fig. 1-3).

A device for testing the reservoir works as follows.

Before launching into the well, the device is connected via drill pipes to drill pipes or other parts of the test equipment. When descending into the well, the device is in a transport state: its inlet and additional inlet valves are in the closed position, and the equalizing valve is in the open position. The holder 38 (Fig. 3), rigidly connected with the lower body part 2 of the cylindrical body, is in a spline connection with the lower part 5 of the rod with a spline connection, which prevents their mutual rotation. After the device is lowered into the well under the action of a compressive load on the device, the radial openings of the equalizing valve are closed, and the radial openings of the additional inlet valve open. To open the inlet valve, the drill pipes are turned to the right by a predetermined number of revolutions (for example, 15 revolutions), while the upper body part, consisting of the upper 21 (Fig. 1) and lower 22 elements, the middle 1 and lower 2 body parts of the cylindrical body rotate relative to bottom part 5 of the stem with spline connection. The additional rod 8 (Fig. 2) due to the bracket 9, sliding along the helical groove, moves down, then through a telescopic connection made using the upper 17 (Fig. 1) and lower 18 sleeves with collars, acts on the spool sleeve 6, then there is a combination of the holes of the spool sleeve 6 and the casing 7 and the subsequent opening of the intake valve. Formation fluid from the test area through openings (not shown) through the cavities of the upper 3 (Fig. 2), middle 4 and lower 5 parts of the rod with a spline connection enters the drill pipe, which ensures an open test period. After holding a certain period of time on the inflow, the pipes are rotated to the right for another as many predetermined revolutions (for example, 15 revolutions), as a result of which the inlet valve controlled by rotation is closed. Thus, the mode of registration of the reservoir pressure recovery curve is established. If it is necessary to conduct a multi-cycle test, the operation of opening and closing the intake valve is carried out repeatedly.

After the test for the device is completed, by tensioning the drill pipes, a tensile load is created, under the action of which the additional inlet valve closes and the equalizing valve opens. The slots (not shown) of the sleeve 38 (Fig. 3), rigidly connected to the lower body part 2 (Fig. 2) of the cylindrical body and the slots (not shown) of the lower part 5 (Fig. 3) of the rod with a spline connection, mesh, fix and exclude the mutual rotation of the lower body part 2 (Fig. 2) of the cylindrical body relative to the lower part 5 of the rod with a spline connection.

The application of the claimed invention will increase the margin of safety of the upper part of the device and facilitate disassembly of the device, prevent the spool sleeve from moving below the inlet valve and ensure that the radial holes of the inlet valve match, improve the manufacturability of the device and simplify the design, reduce labor costs for manufacturing, assembling and disassembling the device, reduce the risk lapel of the middle and lower case parts of the device, increase the duration of operation and increase reliability injure the problem of clogging of sand in the channel between the hollow casing and the cylindrical body.

Claims (2)

1. A device for testing the formation, comprising a cylindrical body, consisting of upper, middle and lower body parts, a rod with spline connection concentrically mounted in a cylindrical body, provided with a shoulder with O-rings, below which are made radial openings, an inlet valve, and a spool sleeve telescopically connected with an additional rod and installed with the possibility of axial movement during rotation of the pipe string, an additional rod, on the outer surface of which an infinite a helical groove in which a bracket is placed rigidly connected to a finger located directly in the middle of the cylindrical body, an additional rod is mounted movably relative to the shaft with a spline connection and a cylindrical body, an additional inlet valve consisting of a pressure reducing valve and a differential sleeve located in the cylindrical body , equalizing valve, thrust bearing installed between the cylindrical body and the sub, characterized in that the upper body part in polyene demountable, equipped with a spool bush bounding nut telescopic connection sleeve and an additional slide valve stem formed by the top and bottom sleeves with collar, bracket fixed adjusting screw. 2. The device for testing the formation according to claim 1, characterized in that the pressure reducing valve consists of a seat, support, stem, spring and roller.

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