Downhole hydraulic jack for releasing of stuck pipes

FIELD: oil and gas well drilling and overhaul repair, particularly to remove tubing and drilling strings, packers and other equipment stuck in cased wells.

SUBSTANCE: hydraulic jack connected to fishing string of tubing or drilling pipes to be lowered in well comprises hydraulic power cylinders, hydraulic anchor, shaft including facetted rod in nipple having mating profile and connected to the body. Discharge valve is installed over power cylinders so that the valve may cooperate with upper shaft end. Upper shaft end is provided with telescopic pusher. The shaft is hollow along the full shaft length. Facetted rod is connected to sub having seat for check valve ball receiving and flushing pipe. Discharge valve is made as spring-loaded piston with sealing collar. Telescopic pusher consists of guiding bush and sliding collet.

EFFECT: increased efficiency and reliability.

2 cl, 4 dwg

 

The invention relates to drilling and overhaul of oil and gas wells, and is intended to eliminate sticking in and out of cased wells tubing, drill pipe, packers and other attached objects.

Known depth hydraulic Jack to eliminate sticking (EN 2190080 C2), in which case the power cylinders connected to the hydraulic anchor, and the barrel of the hydraulic cylinder is directly connected with the fishing string and down through the fishing tool connects to the stuck object. On the stuck object in addition to the main effort, developed by the hydraulic cylinders may be transferred to an additional axial force from the lifting installation through fishing column. The design of the Jack allows control from the surface over the course of the extraction stuck object.

For reliable coupling of the anchor from the casing, prevent slipping on the pipe wall when switching between hydraulic anchor and hydraulic power cylinders mounted adjustable bypass valve, providing primary inclusion anchor when creating pressure.

The jacks described type design GUIDE, produced at the plant of JSC NPO Burenie, were successfully tested in the wells of the Kuban, Nyumenneftegas and in other areas. Testing is confirmed that the operating parameters of the estimated characteristics. Several wells have been successfully performed operation for removing the stuck tool.

At the same time, tests revealed the shortcomings and inconsistencies of the specified design requirements in certain circumstances.

First of all, it is a necessity of increasing the casing pressure to "recharge" the Jack before the next working stroke.

In a deep and contaminated wells and, especially, the location of the Jack in the curved section of the borehole pressure in the casing string at "recharge" may increase by 4.5 - 5 MPa or more. In some wells, especially gas having a high permeability of the reservoir, this pressure increase is unacceptable, because it can cause pollution, clogging of channels of the collector, complications in the subsequent call flow.

Further, the use of hydraulic jacks type GUIDE assumes rinse well. Nodes Jack, first of all adjustable valve, when the clogging of channels of mud flowing fluid through the filler valve to fail.

The design of the Jack are not available wash well through the tool during the descent and at the bottom.

Therefore, the use of jacks type GUIDE in wells with large curvature of the trunk, and also in the well bottom zone which, after sticking apolena settled sludge or sand - it is impractical.

A known design of hydraulic jacks more appropriate for these conditions.

Hydraulic Jack connected to hydrocoral and, further, with the fishing string. The barrel of the hydraulic cylinder is connected through the fishing tool with the stuck object.

In the upper part of the cylinders is made of the radial discharge of the window, which opened at the end of the stroke of the piston, providing a pressure drop signal the end of the stroke and pressure compensation in the cavity of the device from the well. Provided by the filler and drain valves, respectively, to fill the tool downhole fluid during the descent and drain it when lifting tool.

Filler valve allows only backwash, rinse well during the descent and at the bottom is not provided.

The design provides a convenient recharging Jack for re-operations simple lifting tool for piston stroke after the cessation of circulation, without increasing the pressure in the well. [The use of technical devices for the elimination of tacks in the oil industry. Thematic scientific and technical reviews, a series of "Drilling". Moscow, VNIIEM, 1977, p.10].

The disadvantage of the design is a danger of destruction of the seals of the piston in unloading boxes of the cylinder under the action of the confused is Yes pressure.

Another disadvantage is unreliable way to transfer rotation and torque on a fishing tool through the Cam coupling, which is made on the cylinder barrel and the top sub, for which the body of the Jack to be moved to a lower position until it stops in the barrel of the Jack. At other positions of the pistons in the cylinder rotation and torque is not transmitted.

Known hole gidrotartrat to eliminate sticking, containing the power cylinders, the casing of which is connected with a hydraulic anchor and above, with the fishing string. The barrel of the Jack includes a square bar in the nipple of the response profile on the housing that allows the transmission of rotation fishing tool throughout the course of the pistons of the cylinders. To "recharge" Jack stop fluid injection and fishing pier with the body lift on the stroke length of the pistons. The disadvantage of this device is the fact that the washing of the wells during the descent and at the bottom, and the discharge pressure at the end of the stroke of the pistons design does not (see the Composite catalog of oil field equipment, 1995-1996, M, Fuel and Energy, Vol.2, str).

The goal of the invention is to improve the efficiency and reliability of the device and use it for intensive washing of the wells during the descent and at the bottom.

Put the second task is solved by that deep gidrotartrat to eliminate sticking, tubing, drill pipe, packers and other objects in the cased wellbore, the descent into the well on fishing the tubing or drill pipe, contains the power cylinders, hydraulic anchor and trunk, including faceted bar in the nipple of the response profile on the housing. The new device is that over hydraulic power cylinders, with the possibility of interaction with the upper end of the stem, set the exhaust valve, the upper end of the stem with a retractable plunger and the stem is made hollow throughout its length, its faceted rod connected to the sub, which made the saddle under the ball check valve and is installed flush fitting.

The exhaust valve is made in the form of a spring-loaded piston with lip seal, its body is made with longitudinal grooves and sliding the pusher consists of a guide sleeve and a sliding, lockable in the extended position, the collet.

Gidrotartrat is illustrated in the drawings, figure 1 is a-4. Figure 1 shows a General view of the Jack, its layout; figure 2 - diagram of the exhaust valve in the closed position; figure 3 is a retractable plunger movements of the collet in a fixed working position; figure 4 is an exhaust valve to open the position.

The layout of the hydraulic cylinder includes the following series-connected, the main elements (figure 1): drain valve 1, the anchor 2 with sliding plates 3, the exhaust valve 4 with a narrow longitudinal slits 5 on the housing, the power cylinders 6, faceted rod 7 mounted in the nipple 8, the bottom sub 9 wash nozzle 10.

The power cylinders 6 are composed of several sections, the number of which is determined depending on operating conditions of the hydraulic cylinder. Each section includes a cylinder 11, the hollow rod 12 with a radial hole 13, the piston 14 one-way cuff 15 and the nipple 16 with the elastic seal 17. The hollow barrel of the Jack form the rods 12, United pistons 14, faceted bar 7 and the sub 9.

For fixing the barrel of the Jack in its upper position during transportation and the descent into the well installed shear pins 18. The body of the Jack is formed by: the drain valve 1, the housings of the armature 2 and the exhaust valve 4, the cylinder 11 is connected by a nipple 16, the nipple 8 faceted rod 7 and the cylinder with holes under shear pins 18.

The rod 7 is screwed sub 9 for connection with a fishing tool (not shown). In the sub 9 made saddle 19-return valve for the landing of the ball 20. Sub 21 drain valve 1 is connected with the fishing string 22.

Inside the housing 23 of the exhaust to the Apana 4 (2-4) is installed with the possibility of axial movement of the hollow piston 24, with the ring 25 and the sleeve 26 of the seal. In the cavity of the piston 24 is installed spring 27 which presses the piston 24 to rest on the ledge of the housing 23. At the end of the stem of the Jack installed retractable plunger 4, consisting of a sleeve 28 and a sliding collet 29.

During the descent of the Jack in the hole when the barrel with the piston 14 is fixed in the upper position, the shear pins 18, the collet 29 is shifted down on the sleeve 28 until it stops at the end of the stem (figure 2)and oblique cuts on the thickening of the plate gripper 29 is pressed against the conical surface of the bushing 28.

When moving the barrel with the piston 14 in the lower position, the collet 29, resting on the nipple 16, slides over the sleeve 28 up (figure 3), the plate gripper 29 are moved apart and then come together over the end of the sleeve 28, the locking collet 29 is in its extended position (figure 4). Further, at the end of each stroke of the piston 14 upward by the plunger exhaust valve 4 opens it, and when the displacement of the Jack barrel down under the action of a spring 27, the valve 4 is closed.

Jack works as follows. During the descent into the well fluid through the hollow shaft enters the cavity of the Jack and the column extractor pipe 22. At any depth the descent can be stopped, to the fishing string 22 is attached in the discharge line and through the hollow stem of the Jack and the socket 10 mounted in the lower sub 9 produced by washing the well is s. It should be borne in mind that when washing in the Jack pressure significantly exceeds the pressure in the well. The differential pressure die presses the armature 3 to the casing with great effort, therefore, to move the column in the well in the washing process is prohibited.

During the descent to the bottom of the axial jet flushing through the fitting 10 is to contribute to the cleaning head stuck object from the settled sand or mud, to increase the possibility of successful accession fishing tool (not shown). After joining in some cases it is advisable to try calling the circulation through the channels stuck object that can facilitate the elimination of sticking. After the washing is tension tool, cut off the pins 18, the tool body of the Jack rises up until it stops. Creates a force in 5-15 t to verify the reliability of attaching a fishing tool. In the fishing column 22 clears the ball for 20 seated in the saddle 19-return valve. Landing can be accelerated restoration of circulation. The growth pressure and the cessation of circulation indicate the closing of the check valve.

To eliminate the sticking of the pressure in the discharge line may be increased to the value specified in the passport of the Jack. Upon reaching efforts on the stem of the Jack enough to be Alenia resistance on the stuck object, the trunk to retrieve the tool starts to get up. The end of stroke of the pistons 24 is accompanied by a sharp pressure drop at the opening of the exhaust valve 4. Circulation stops, is exposure to equalize the pressure in the Jack and well, what you need to wear protection weapons dice 3 anchor 2. The instrument rises to the stroke of the pistons 14 Jack, i.e. until the tension. Again creating pressure, the process is repeated until the complete elimination of sticking.

In addition to the features that distinguish the proposed design from Jack GUIDE, it should be noted two circumstances:

- extra cylinder fully compensate for the lost opportunity to transfer on the stuck object efforts through the fishing tool from the lifting installation, since the total load in both cases is limited by the strength of the Jack barrel;

- the proposed design provides a more reliable transmission of torque to a fishing tool when attaching and detaching from the stuck object, because the time from fishing column was not transmitted by the rod of the Jack, with a minimum diameter of the thread and the body of the Jack.

1. Deep gidrotartrat to eliminate sticking, tubing, drill pipe, packers and other objects in EAC the leaders introduce the wellbore, the descent into the well on fishing the tubing or drill pipe containing power cylinders, hydraulic anchor and trunk, including faceted bar in the nipple of the response profile on the housing, characterized in that the above hydraulic power cylinders interoperable with the upper end of the stem has an exhaust valve, the upper end of the stem with a retractable plunger and the stem is made hollow throughout its length, its faceted rod connected to the sub, which made the saddle under the ball check valve and is installed flush fitting.

2. Deep gidrotartrat to eliminate sticking according to claim 1, characterized in that the exhaust valve is made in the form of a spring-loaded piston with lip seal, its body is made with longitudinal grooves and sliding the pusher consists of a guide sleeve and a sliding lockable in the extended position of the collet.



 

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1 dwg

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