RU2380516C1 - Well head device for tubing string release from well - Google Patents

Abstract

FIELD: oil-and-gas industry.

SUBSTANCE: well head device for tubing string release from a well includes a vertical impulse generator and a damper, installed between a lift and the vertical impulse generator. At that the damper executed as a vertical sealed cylinder with a piston, which internal cavity filled with gas, and the generator executed as a tube case with additional cylinder with a ring piston installed on the top, interacting from the bottom with a stringed balance, executed with ability of reciprocate displacements along the tube case. Cavity over the piston executed with ability to connect to a pump, equipped with a buffer tank, through a distributor, consisting of a cylindrical case with two chambers, which connected with each other with channel, created in the distributor wall, and a drive rotating wall, equipped with straight valve for liquid supply from a pump and a return valve for liquid a cutting, periodically connecting with mentioned above channel.

EFFECT: simple design and the tubing string release from a well efficiency increase due to upward directed force increase.

2 cl, 2 dwg

Description

The invention relates to the oil and gas industry, in particular to wellhead devices for releasing an emergency pipe string seized in a well.

Known wellhead installation of generation and transmission of acoustic energy to release a stuck pipe string in a borehole (US 4429743, E21B 37/08; E21B 41/00, publ. 02/07/1974), including an orbital mass generator designed to generate acoustic energy with a resonator connected at the mouth to the pipe string, a hoist and a damper mounted between the generator and the hoist and made in the form of a piston vertical shock absorber filled with a liquid or gas-liquid mixture.

The disadvantages of this wellhead installation are:

- firstly, the complexity of the design, due to the large number of nodes and parts;

- secondly, the high cost of manufacture and metal consumption (orbital mass generator is designed to generate acoustic energy with a resonator).

The closest in technical essence is a wellhead device for releasing a pipe string from a well (patent US 3500908, ЕВВ 37/08; ЕВВ 41/00, publ. 02/07/1974), including a damper installed between the hoist and the vertical pulse generator, which connected to the pipe string from below, and the damper is made in the form of upper and lower horizontal plates with vertical cylinder and rod telescopically inserted into each other, between the stops of which springs are installed, and the vertical pulse generator is made as a set ennyh housing connected in pairs vertical gears with the displaced center of gravity, chosen so that rotation of gears their total momentum is directed along the pipe string axis.

The disadvantages of this wellhead installation are:

firstly, the complexity of the design, due to the large number of nodes and parts;

secondly, the high accuracy of the manufacture of gears, directly affecting the high cost of the device in manufacture, in the opposite case, gears may jam during operation;

thirdly, the effort along the axis of the column, created on the stuck pipe string is equivalent in effort up and down, which reduces the efficiency of extraction of the stuck pipe string from the well.

The objective of the invention is to simplify the design of the device, reducing the cost of its manufacture, reducing metal consumption, as well as increasing the efforts directed upward.

The problem is solved by the wellhead device for releasing the pipe string from the well, including a damper installed between the hoist and the vertical pulse generator, which is connected to the pipe string from below.

What is new is that the damper is made in the form of a pair of a vertical sealed cylinder with a piston, the internal cavity of which is filled with gas, and the vertical pulse generator is made in the form of a tubular body connected from above to the damper, and from below to the pipe string, with an additional cylinder mounted on top of an annular piston interacting from below with an annular load spring-loaded upward from the lower stop, which is configured to reciprocate along the tubular body and interact with when moving upward with the additional cylinder, and the supra-piston cavity of the additional cylinder is arranged to communicate with the pump equipped with a buffer tank through a distributor consisting of a two-chamber cylindrical body and with a partition rotating from the drive equipped with a cutout, while the first camera is in communication with the second camera channel, with the pump outlet and the over-piston cavity of the additional cylinder, and the second with the buffer capacity of the pump, and the baffle is sealed overlapping the channel of the cylindrical body and periodically during rotation of the message of its cutout with this channel.

It is also new that the size of the cutout of the partition along the circumference is selected depending on the required vibrational impact, since it is inversely proportional to the amount of cargo moving down under the action of the annular piston, which is moved under the influence of the pump.

Figure 1 shows the proposed wellhead device for releasing a pipe string from a well in longitudinal section.

Figure 2 shows a section aa of the distributor.

The wellhead device for releasing the pipe string from the well (not shown) includes a damper 1 (see FIG. 1) installed between the hoist 2 (hook block is conventionally shown) and the vertical pulse generator 3.

Damper 1 is made in the form of a pair of vertical sealed cylinder 4 with a piston 5 hermetically inserted into it, the internal cavity 6 of which is filled with gas (for example, nitrogen under a pressure of 30.0 MPa).

The vertical pulse generator 3 is made in the form of a tubular body 7 connected from above to the piston of the damper 1.

An additional cylinder 8 is mounted on top of the vertical pulse generator 3 on top, into which the annular piston 9 is sealed, interacting from below with the annular spring-loaded upward by means of the spring 10 from the lower stop 11 of the tubular body 7 with a load 12, which is arranged for reciprocating movement along the tubular body 7 and interaction from below when moving up with the additional cylinder 8. On top of the tubular body 7 by means of an additional cylinder is connected to the piston 5 of the damper 1.

Bottom of the tubular body 7, the vertical pulse generator 3 by means of a tee 13 is connected to the string of pipes 14. The nadporshne cavity 15 of the additional cylinder 8 is made with the possibility of communication with the pump 16.

The pump 16 is equipped with a buffer tank 17, through the distributor 18, consisting of a two-chamber cylindrical body 19 with a wall 20 'and with a partition 20 rotating from the drive (see Figs. 1 and 2), equipped with a cutout 2. The first chamber 22 is in communication with the second chamber 23 a channel 24, made in the wall 20 ', with the outlet of the pump 16 and the over-piston cavity 15 of the additional cylinder by means of a hydraulic line 25. The second chamber 23 of the distributor 18 is in communication with the buffer capacity 17 of the pump 16. The partition 20 is made with the possibility of hermetically closing the cylinder channel eskogo body 19 and distributor 18 under a periodic rotation with the channel 24 posts its recess 21.

The size (geometric dimensions) of the cutout 21 of the partition 20 around the circumference is selected depending on the required force of the vibration effect, since it is inversely proportional to the amount of movement of the load 12 down under the influence of the annular piston 9, moved under the influence of the pump 16.

Wellhead device for releasing a pipe string from a well works as follows.

The device is assembled at the wellhead, as shown in the drawing, after which, using the elevator 2, the device is tensioned and, accordingly, the pipe string 14 seized in the well.

The distributor 18 is driven by an engine 26 (of any known construction), which transmits rotational motion through the shaft 27 and the key 28 to the baffle 20 having a cutout 21. The pump 16 is actuated, which can be of any known construction, for example one that shown in the drawing.

During the rotation of the partition 20, the working fluid (for example, process water) is pumped by the pump 16 into the distributor 18 (see FIG. 1), while at the moment when the partition 20 seals the channel 24 of the cylindrical housing 19 of the distributor 18, the first distributor chamber 22 18 is in fluid communication with the outlet of the pump 16 and the piston cavity 15 of the additional cylinder 8 by means of a hydraulic line 25. As a result, the flow of the working fluid under the influence of the discharge pressure of the pump 16 through the first chamber 22 of the distributor 18 tremlyaetsya on the hydraulic line 25 in the cavity above the piston 15 of the auxiliary cylinder 8.

As a result, the annular piston 9, under the action of the hydraulic pressure generated by the pump 16 in the supra-piston cavity 15, moves downward relative to the remaining stationary tubular housing 7 of the vertical pulse generator 3 and the additional cylinder 8, acting on the load 12, which simultaneously with the annular piston also moves downward relative to the tubular case 7 of the vertical pulse generator 3, compressing the spring 10, abutted against the stop 11.

The compression of the spring 10 and, accordingly, the downward movement of the annular piston 9 and the load 12 occurs until the baffle 20 with its cutout 21 (see FIG. 2) communicates with the second chamber 23 through the channel 24, while the second chamber 23 of the distributor 18 (see Fig. 2) will communicate with the buffer tank 17 of the pump 16, while the working fluid under pressure created by the pump 16 will flow through the distributor 18 and dumped into the buffer tank 17.

As a result, the pressure in the above-piston cavity 15 of the additional cylinder 8 drops and, due to the return force of the spring 10, the annular piston 9 together with the load 12 abruptly moves upward relative to the remaining stationary tubular housing 7 of the vertical pulse generator 3 and the additional cylinder 8, while the upper end 23 is hit load 13 about the lower end of the additional cylinder 8, which transfers upward shock force to the piston 5 of the damper 1, and since the additional hydraulic cylinder 8 is rigidly connected to the stuck column tr 14 b of the tubular body 7 by means of the vertical pulse generator 3 and the tee 13, the sharp breakthrough occurs (pass, upward) stuck pipe string 14 up.

Since the additional cylinder 8 is rigidly connected to the piston 5 from above and the internal cavity 6 of the cylinder 4 of the damper 1 is filled with gas, the upward impact force perceived by the lift 2 is quenched. Thus, one well cycle of the wellhead device for releasing the pipe string from the well takes place.

Subsequently, the cycle is repeated, as described above, and the number of strokes directed upward (jerking, stuck pipe string 14) corresponds to the number of revolutions of the partition 20, driven by the motor 26 through the shaft 27 and the key 28 (see figure 2).

If necessary, at any time during the release in the presence of circulation, it is possible to flush the stuck pipe string 14 with a tee 13.

The proposed wellhead device for releasing a pipe string from a well has a simple structure and is relatively cheap to manufacture and has a lower metal consumption compared to the prototype, while the device design allows to significantly increase the forces directed upward along the axis of the pipe string, which increases the efficiency of extracting the stuck pipe string in the well.

Claims (2)

1. Wellhead device for releasing a pipe string from a well, including a damper installed between the elevator and the vertical pulse generator, which is connected to the pipe string from below, characterized in that the damper is made in the form of a vertical sealed cylinder with a piston, the internal cavity of which is filled with gas, and the vertical pulse generator is made in the form of a tubular body connected from above with a damper, and from below with a pipe string, with an additional cylinder with an annular piston mounted on top, mutually acting from the bottom with an annular load spring loaded upward from the lower stop, which is made with the possibility of reciprocating movement along the tubular body and interacting from below when moving upward with the additional cylinder, the over-piston cavity of the additional cylinder being configured to communicate with a pump equipped with a buffer tank through a distributor consisting of a two-chamber cylindrical body and with a partition rotating from the drive equipped with a cutout, the first chamber being communicated the second chamber conduit with the pump outlet and above the piston space of the auxiliary cylinder and the other - with a buffer capacity of the pump, wherein the dividing wall is adapted to sealingly overlap the channel of the cylindrical housing during rotation and periodic posts its cutout with this channel. 2. Wellhead device for releasing a pipe string from a well according to claim 1, characterized in that the circumferential cutout is selected depending on the necessary vibrational impact, since it is inversely proportional to the amount of cargo moving down under the action of the annular piston moved under the influence of the pump .

Images