RU2784131C1 - Sucker rod catcher on rope - Google Patents

Abstract

FIELD: oil industry.

SUBSTANCE: invention relates to the oil industry, in particular to equipment for extracting broken rods from a tubing string located in a well. The sucker rod catcher on a rope includes a hollow body with a cylindrical recess on the inner surface and a reverse funnel from below, rams pressed inward by a spring and located in the sample of the hollow body, equipped with inclined sections on the inner surface from below, from above, a load is connected to the hollow body by means of a coupling, made in the form a hollow column of pipes, and a cable head connected to a rope is screwed onto the load. The hollow body consists of lower, middle and upper sections rigidly connected to each other. The lower section is equipped with a return funnel. Each section of the hollow body is equipped with an internal cylindrical recess. Dies with inclined sections, consisting of three biscuits, are installed in the inner cylindrical recesses of the hollow body sections. Outside, each die with an inclined section is equipped with a spring split ring that presses the crackers of the dies inward. The compression force of the spring split rings, compressing the inside of the dies in each section of the hollow body, decreases from top to bottom. Through diameters d1; d2; d3 dies installed in each section of the hollow body are reduced from bottom to top. The weight of the load is greater than the maximum expansion force of the spring split ring.

EFFECT: improving the reliability of the catcher, developing a universal design of the catcher for the standard size of a broken string of sucker rods with a diameter of 19 to 25 mm located in the well, as well as expanding the functionality of the catcher and eliminating the cost of servicing the catcher before lowering it into the well.

1 cl, 5 dwg

Description

The invention relates to the oil industry, in particular to equipment for extracting broken rods from a tubing string (tubing) located in a well.

Known catcher sucker rods (patent No. 2170327, IPC E21V 31/18, publ. 07/10/2001), designed for catching rods in a tubing string and with a grip /stop/ for threaded connection elements - coupling, thrust and support collars on rod head with a collet and containing a body, a sub, a collet with feathers, located in the windows of the body. The sub is connected to the body by means of rods. The rods are located taking into account the passage between them of the body of the fishing rod. On the outer surface of the feathers, ledges are made to interact with the upper edges of the housing windows. This catcher is a close analogue of the LShU type catchers and differs in that it is elongated due to 2 welded thin rods that connect the head with a thread of the Sh19, Sh22 type and the body with a collet grip. The catcher is elongated to pass the body of the broken rod through it. This design makes it possible to work in wells with paraffin-resin deposits, since asphalt-resin and paraffin oil components freely pass through the gaps between the rods both in the axial and radial directions.

The disadvantage of the known catcher is the impossibility of its use for catching pumping rods with a diameter of 25 mm, carrying out fishing operations only inside the tubing, the unreliability of fastening the collet grip, the connecting thread of the rods is weak - Ш19, Ш22 and a small carrying capacity - up to 4-5.5 tons, as well as the duration of operations to extract a broken rod string from the well, since the catcher is lowered into the well (tubing string) on a pipe string (rods).

Also known is a combined sucker rod catcher (patent RU No. 2267598, IPC E21V 31/18, publ. 01/10/2006), having the ability to pass pump rods through its flow area, containing a housing having a conical surface and connected in the upper part to the head, a gripper pump rods, made in the form of crackers, having the possibility of axial movement and away from the center in the conical surface of the housing and fixation under the coupling, thrust and support collars on the rod head and a guide funnel having a conical surface inside to ensure the possibility of moving away a torn or unscrewed of the upper end of the rod from the wall of the production string and centering it in the center of the body, while the grip of the pump rods is made in the form of two interchangeable biscuits floating on the conical surface of the body for standard sizes of pump rods with a diameter of 25, 22 and 19 mm, the guide funnel has a conical surface inside together with the body, catches to the head The pump rods are connected to the tubing for lowering the pump rod catcher, while the pump rod catcher is designed according to the diameter of the production string, has the ability to pass pump rods wedged in the tubing through its flow area, and the tubing - in the production string.

Disadvantages of this catcher:

- firstly, the complexity of the design, due to the large number of components and parts (a body having a conical surface and connected in the upper part to the head, the grip of the sucker rods, made in the form of crackers, a guide funnel, etc.);

- secondly, the design is not universal, since in order to extract each standard size of a broken rod from the tubing string: 19, 22, 25 mm, it is necessary to individually install dies - crackers in the device body;

- thirdly, the duration of operations to extract a broken rod string from the well, since the catcher is lowered into the well (tubing string) on a pipe string (rods);

- fourthly, the large length of the structure, which increases the installation time of the catcher on the well and creates additional financial costs.

The closest in technical essence and the achieved result is a catcher, including a hollow body with a cylindrical recess on the inner surface and a reverse funnel from below, pressed inward by a spring and located in the sample of the hollow body of the die, equipped with inclined sections on the inner surface from below, from above by means of a coupling to the hollow body a load made in the form of a hollow column of pipes is connected, and a cable head connected to a rope is screwed onto the load (patent RU No. 2280147, IPC E 21 B 31/18, publ. 20.07.2006).

Disadvantages of this catcher:

- firstly, low reliability of operation, associated with a high probability of spring breakage under load when capturing or extracting a broken rod string from the well, as well as with jamming of the hinge during operation;

- secondly, the design is not universal, since in order to extract each standard size of a broken rod from the tubing string: 19, 22, 25 mm, it is necessary to individually install slips with inclined sections into the body of the catcher;

- thirdly, limited functionality due to the fact that it is impossible to extract a stepped broken string of rods from the tubing string or well, for example, a rod with a diameter of 22 mm connected to a rod of 19 mm;

- fourthly, the cost of servicing the catcher before lowering into the well is required. This is due to the fact that, depending on the diameter of the broken rod located in the well and requiring extraction, it is necessary to disassemble and assemble the catcher, while installing the dies under the standard size of the broken string rods, for example, 22 mm.

The technical objectives of the invention are to increase the reliability of the safety catcher, to develop a universal design of the safety catcher for the standard size of a broken string of sucker rods with a diameter of 19 to 25 mm located in the well, as well as to expand the functionality of the safety catcher and eliminate the costly maintenance of the safety catcher before lowering into the well.

The set technical problems are solved by a sucker rod catcher on a rope, which includes a hollow body with a cylindrical recess on the inner surface and a reverse funnel from below, rams pressed inward by a spring and located in the sample of the hollow body, equipped with inclined sections on the inner surface from below, connected from above by means of a coupling to the hollow body a load made in the form of a hollow column of pipes, and a cable head connected to a rope is screwed onto the load.

What is new is that the hollow body consists of lower, middle and upper sections rigidly connected to each other, and the lower section is equipped with a reverse funnel, while each section of the hollow body is equipped with an internal cylindrical recess, and rams with inclined sections, consisting of three crackers, and on the outside, each die with an inclined section is equipped with a spring split ring, which presses the crackers of the dies inward, while the compression force of the spring split rings, compressing the inside of the die in each section of the hollow body, decreases from top to bottom, as well as through diameters d ₁ ; _d2 ; d ₃ slips installed in each section of the hollow body decrease from the bottom up, while the weight of the load is greater than the maximum expansion force of the spring split ring.

In FIG. 1 shows a universal rod catcher on a rope in its original position.

In FIG. 2 shows a cross section A-A of a universal catcher.

In FIG. 3 shows a cross section B-B of a universal catcher.

In FIG. 4 shows a cross section B-B of a universal catcher.

In FIG. 5 shows a universal rod catcher on a rope in working position.

The sucker rod catcher on the rope includes a hollow body 1 (see Fig. 1-5), consisting of a lower 2 (see Fig. 1, 2, 5), middle 3 (see Fig. 1, 3, 5) and upper 4 (see Fig. 1, 4, 5) sections rigidly connected to each other, for example, using threads (not shown in Fig. 1-5). The lower section 2 (see Fig. 1) is equipped with a return funnel 5 (see Fig. 1, 5). Each section 2, 3 and 4 of the hollow body 1 is equipped with a cylindrical sample 6 (see Fig. 1, 2, 5), 7 (see Fig. 1, 3, 5) and 8 (see Fig. 1, 4, 5 ), respectively.

Dies 9 (see Fig. 1, 2, 5), 10 (see Fig. 1, 3, 5) and 11 ( see Fig. 1, 4, 5), respectively.

Dies 9, 10 and 11 (see Fig. 2-4), consist of three crackers 9', 9'', 9''' (see Fig. 2); 10', 10'', 10''' (see Fig. 3) and 11', 11'', 11''' (see Fig. 4), respectively. Dies 9, 10 and 11 from below on the inner surface are provided with inclined sections 12 (see Fig. 1, 5), 13 and 14.

Outside, each plate 9, 10 and 11 (see Fig. 1) is equipped with a spring split ring 15 (see Fig. 1, 2, 5), 16 (see Fig. 1, 3, 5) and 17 (see Fig. . 1, 4, 5), respectively, pressing crackers 9', 9'', 9'''; 10', 10'', 10''' and 11', 11'', 11''' of the corresponding dies 9, 10, 11 inside.

Compression force F ₁ ; _F2 ; F _{3 of} the corresponding spring split rings 15, 16, 17, compressing the corresponding dies 9, 10, 11 inward in each corresponding section 2, 3 and 4 of the hollow body 1 decreases from top to bottom. For example: F ₁ \u003d 30 kg \u003d 300 N; F ₂ \u003d 40 kg \u003d 400 N; F ₃ \u003d 50 kg \u003d 500 N, i.e. F ₁ < F ₂ < F ₃ .

Pass diameters d ₁ ; _d2 ; d ₃ corresponding dies 9, 10 and 11 installed in each respective section 2, 3 and 4 of the hollow body are reduced from bottom to top.

From above, by means of a coupling 18 (see Fig. 1, 5), a load 19 is connected to the hollow body 1, and a cable head 20 connected to the rope 21 is screwed onto the load 19.

The weight of the load 19 is selected depending on the maximum force (F₃) compression, which is the spring split ring 17 for example, 50 kg, so a hollow pipe string weighing at least 50 kg is used as a load. For example, tubing with a diameter of 42 mm with a wall thickness of 3.5 mm is used according to GOST 633-80 “Tubing pipes and couplings for them”, having a weight of 1 linear meter. meters equal to 3.3 kg. Thus, two tubing pipes with a diameter of 42 mm and a length of 8 m are used as load 19: 2 × 8 m × 3.3 kg = 52.8 kg = 528 N > 500 N (maximum expanding force of the spring split ring 17).

Catching pump rods on the rope works as follows.

When operating sucker rod pumps, rods with diameters of 19, 22, 25 mm are used as drives to them.

According to GOST 31825-2012 '' Pump rods, wellhead rods and couplings for them. Specifications''.

The rod 22 (see Fig. 5) with a diameter: d _w1 = 19 mm has a diameter d _m1 of the thrust collar of the coupling 23 equal to 38 mm. Then the diameter d ₁ \ _u003d (d w1 + d _m1 ) / 2 \u003d (19 mm + 38 mm) / 2 \u003d 28.5 mm.

The rod 22 (see Fig. 5) with a diameter: d _w2 = 22 mm has a diameter d _m2 of the thrust collar of the coupling 23 equal to 43 mm. Then the diameter d ₂ \u003d (d _w2 + d _m2 ) / 2 \u003d ( 22 mm + 43 mm) / 2 \u003d 32.5 mm.

The rod 22 (see Fig. 5) with a diameter: d _w3 = 25 mm has a diameter d _m3 of the thrust shoulder of the coupling 23 equal to 51 mm. Then the diameter d ₃ \u003d (d _w3 + d _m3 ) / 2 (25 mm + 51 mm) / 2 \u003d 38 mm.

For example, consider the capture and extraction of a broken pump rod with a diameter of 22 mm from a tubing string or a well using rams 10 placed in the inner cylindrical sample 7 of the second section 3 of the hollow body 1.

At the wellhead (not shown in Figs. 1-5), the device is assembled. To this end, from above to the hollow body 1 (see Fig. 5) by means of a coupling 18, a load 19 is attached, as indicated above (two tubing pipes with a diameter of 42 mm). Then, a cable head 20 connected to the rope 21 is screwed onto the load 19 from above. The assembled assembly on the rope 21 is lowered into the well or into the tubing string, for example, with a diameter of 73 mm, until the broken rod string, for example, with a diameter of 22 mm, enters the internal space the lower section 2 of the hollow body 1 thanks to the reverse funnel 5, and further to contact with the inclined section of the die 10, located in the cylindrical sample 7 of the middle section 3 of the hollow body 1.

The catcher is unloaded onto the dangling column of rods 22, while the load is reduced (the tension of the rope 21 is loosened), as evidenced by the readings on the weight indicator installed on the geophysical lift (not shown in Fig. 1-5).

In the process of unloading the catcher onto a broken column of rods 22, the plate 10, consisting of three crackers 10', 10'', 10''', expands radially outward, expanding the spring split ring 16. The spring split ring 16 expands because the force of its unclamping: F ₂ \u003d 40 kg \u003d 400 N is less than the weight of the load 19, which is 52.8 kg \u003d 528 N, i.e. 400 N < 528 N, therefore, the diameter d ₂ \u003d 32.5 mm under the action of the weight of the load 19 increases until the coupling 23 (see Fig. 5) of the broken column of rods 22 passes through the die 10, which has a diameter along the collar of the coupling 23 is equal to 43 mm.

As soon as the clutch 23 of the dangling column of rods 22 (see Fig. 5) moving up, is above the die 10, the spring split ring 16 closes, since the body of the rod 22, having a diameter of 22 mm, is opposite the dies, therefore crackers 10 ', 10 '' , 10''' dies 10 return to their original position and capture the sleeve 23 under its lower end. The dangling string of sucker rods 22 is captured by catcher slips 10 and is removed from the tubing string to the surface by lifting with a geophysical lift using a rope 21.

Similarly, capture and extraction from the tubing string or well of a broken string of pump rods 22 with diameters of 19 and 25 mm is carried out by the first 2 or third 4 stages of the hollow body 1, respectively, as well as the capture and extraction of the stepped string of pump rods depending on the diameter of the rod stage, for example if the upper step has a diameter of 25 mm, then the dies 11 are triggered, placed in the inner cylindrical sample 8 of the section 4 of the hollow body 1.

The reliability of the catcher operation is increased, since the breakage of the spring under load is completely excluded when capturing or extracting a broken string of rods from the tubing string or well, due to the fact that the spring is made not in the form of a twisted spring, but in the form of a spring split ring, for example, a round section, but the absence of a hinge in the design of the catcher eliminates its jamming.

The design of the proposed catcher is universal, as it is designed to extract a broken rod with a diameter of 19, 22, 25 mm from the tubing string of any size, even if the diameter of the broken string of sucker rods is not known before lowering the catcher into the tubing string or well.

The functionality associated with the possibility of extracting a stepped broken string of rods from a tubing string or from a well, for example, a rod with a diameter of 22 mm connected to a rod of 19 mm, is being expanded.

Excludes the cost of servicing the catcher before lowering into the well. This is due to the fact that the catcher has dies for standard sizes of a broken rod string with a diameter of 19, 22 and 25 mm. This does not require disassembly-assembly of the catcher before lowering into the well the required size of rams, depending on the diameter of broken string rods, for example, 22 mm.

The sucker rod catcher on the rope has:

- high reliability of work;

- universal design for the standard size of a broken string of sucker rods with a diameter of 19 to 25 mm, located in the tubing string or well;

- extended functionality;

- no cost for maintenance of the catcher before lowering into the well.

Claims (1)

Sucker rod catcher on a rope, comprising a hollow body with a cylindrical recess on the inner surface and a reverse funnel from below, dies pressed inward by a spring and located in the sample of the hollow body, equipped with inclined sections on the inner surface from below, from above, a load made in in the form of a hollow column of pipes, and a cable head connected to a rope is screwed onto the load, characterized in that the hollow body consists of lower, middle and upper sections rigidly connected to each other, and the lower section is equipped with a reverse funnel, while each section of the hollow body is equipped with internal cylindrical recess, and in the inner cylindrical recesses of the sections of the hollow body there are dies with inclined sections, consisting of three crackers, and on the outside each die with an inclined section is equipped with a spring split ring that presses the crackers of the dies inward, while the compression force of the spring split rings compressing the inside three dies in each section of the hollow body, decreases from top to bottom, as well as through diameters d ₁ ; _d2 ; d ₃ slips installed in each section of the hollow body are reduced from the bottom up, while the weight of the load is greater than the maximum expansion force of the spring split ring.

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