RU2564701C1 - Straight-flow downhole cut-off valve - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: cut-off valve includes the following component fixed on a tubing string: a housing with a seat, a valve unit consisting of a hinged flap with a pressure spring, a fixing device consisting of a collet clamp, a movable branch pipe and a return spring. In the upper part of the housing there is a conical neck, and control of closing of the flap is performed by means of a collet clamp lowered by means of a wireline operation, which has clamping teeth on spring brackets, with that, the above clamping teeth are engaged with a groove on the movable tube, as well as diverting projections interacting with the conical neck on the housing. Besides, the housing of the cut-off valve is provided with a branch pipe located below the hinged flap and provided with side holes to receive liquid and with a through holder for a bottomhole apparatus.

EFFECT: improving efficiency of a valve allowing shutdown of the well in operation by shutting off the lower end of the tubing string for the purpose of recording of a pressure recovery curve by independent removed bottomhole apparatus.

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Description

Technical field

The invention relates to the field of oil and gas production, namely to technical means for researching wells, and can be applied when conducting hydrodynamic studies of wells with instant closure of a well in the bottomhole.

State of the art

To improve the quality of hydrodynamic studies of wells by the pressure recovery curve method (hereinafter referred to as the HPC), it is necessary to minimize the influence of transients occurring in the wellbore after it is closed, and also strive for the implementation of "instantaneous" well closure. This goal can be achieved through the use of devices that allow closing the tubing string from below, that is, closing the well at the bottom. For this, it is advisable to use the so-called downhole shutoff valves. Currently, most downhole shutoff valves are used to prevent all kinds of emergency situations, for example, by installing a sleeve packer with a shutoff valve (A. p. 832378, a. P. 697684, a. P. 1010255), the shut-off unit of which is controlled hydrostatic pressure of the liquid located above the packer. There is also a number of devices triggered by an increase in the differential pressure on the fittings built into them (Zaitsev Yu.V., Maksutov R.Α., Asfandiyanov Kh.A. Equipment for preventing open fountains of oil and gas wells. - M .: Nedra, 1973 g.).

However, the devices in question are not suitable for conducting hydrodynamic studies of wells by autonomous deep-well devices with forced closure of the well at the bottom using cable technology. In addition, often in the process of operating, developing or testing a well, it is necessary to remove an autonomous deep tool located in the tubing string without completing a hole and lifting the tubing string to conduct studies of the productive interval of other devices below the shutoff valve. That is, there is a need to create an easy-to-use in-line downhole shutoff valve with the ability to place a retrievable autonomous deep-well device below it.

Known shut-off valve with a rotary damper and a pusher opening it (ed. St. USSR No. 1694862). The valve in the initial state is in the closed position, which makes it inapplicable for conducting hydrodynamic studies of wells by the HPC method.

Closest to the claimed technical solution includes a direct-flow well valve-shutoff valve type OZP-73, including a housing fixed to the tubing with a seat, a valve assembly with a spring-loaded hinged flap, a fixing device consisting of a collet gripper, a movable pipe with a groove and a return spring (Zaitsev Yu.V., Maksutov R.A., Asfandiyanov Kh.A. Equipment for preventing open fountains of oil and gas wells.- M .: Nedra, 1973). The disadvantage of the prototype is the lack of elements for placement of deep instruments under the damper.

SUMMARY OF THE INVENTION

An object of the invention is the creation of a passage valve-shutter run on a string of tubing and controlled by cable technology, which makes it possible to stop a working well by shutting off the bottom end of the tubing in order to record the pressure recovery curve by extractable autonomous deep-well instruments.

This goal is achieved by creating a direct-flow well shut-off valve, which includes a housing fixed to the tubing with a saddle, a valve assembly consisting of a flap with a clamping spring, a fixing device consisting of a collet gripper, a movable pipe and a return spring. A conical neck is made in the upper part of the body, and the closing of the hinged shutter is controlled by means of a collet gripping on the cable technique, which has gripping teeth on the spring consoles that engage with the groove on the movable tube, as well as deflecting protrusions interacting with the conical neck on case, in addition, the valve shut-off case is equipped with an instrument pipe located below the flap with side openings for receiving liquid and a through-hole holder for deep ribo

Analysis of the patent and information materials selected as a result of the search for shutoff valves allows us to conclude that the proposed technical solution is not known from the prior art, i.e. it is new. In addition, this device does not follow explicitly from the prior art, i.e. has an inventive step.

This design is in demand in connection with the need to conduct hydrodynamic studies of wells by the method of pressure relief with ″ instant ″ closing of the well at the bottom.

The proposed design solutions allow you to close a working well on the bottom using cable technology in order to register changes in pressure under the shut-off valve with removable autonomous deep instruments.

List of figures

The invention is illustrated by drawings, where:

In FIG. 1 shows a straight-through valve-shut-off valve mounted on a tubing string in a working well before closing, when lowering a collet gripper using cable technology (not shown in Fig.);

In FIG. 2 shows a gripper of a movable tube with a collet gripper;

In FIG. 3 shows the lifting of the movable tube with a grip and closing the shutter with a pressure spring;

In FIG. 4 shows the lifting of the collet gripper with a movable tube and the detachment of the collet gripper during the interaction of the protrusions with the conical neck on the shut-off valve body;

In FIG. 5 shows a collet with gripping teeth and deflecting protrusions,

where: 1 - body, 2 - hinged damper, 3 - clamping spring, 4 - movable tube, 5 - spring, 6 - collet gripper, 7 - instrument pipe, 8 - depth device, 9 - conical neck, 10 - pass holder for a downhole tool, 11 - a saddle, 12 - side holes, 13 - a protrusion on the shutoff valve body, 14 - an internal groove on a movable tube, 15 - a protrusion on a movable tube, 16 - gripping teeth of a collet gripper, 17 - deflecting protrusions of a collet gripper , 18 - protrusions on the depth device.

The implementation of the invention

Downhole shut-off valve (Fig. 1) consists of a housing 1 with a seat 11 and a conical neck 9 in the upper part of the housing. The housing 1 has a protrusion 13. To the housing 1 is attached an instrument pipe 7 with side holes 12 and a holder 10 for landing the depth tool 8 with protrusions 18. A hinged shutter 2 with a compression spring 3 is fixed on the housing 1. A movable tube 4 s is located inside the housing 1 an internal groove 14 and a protrusion 15. In the cavity between the housing 1 and the movable tube 4, a return spring 5 is located. The shut-off valve also includes a collet 6, which is run on a cable technique, which is self-locking, while the springs These consoles have gripping teeth 16 and deflecting protrusions 17.

The device operates as follows.

The shut-off valve is fixed at the end of the tubing string and with it descends into the well in a normally open position with a downhole tool 8 installed in the holder 10, while the movable tube 4 is in the lower position under the influence of the return spring 5 resting on the protrusions 13 and 15, deflecting the flap 2, and the fluid flows freely through the shutoff valve. During the operation of the well, the fluid enters the tubing through the lateral openings 12 on the instrument pipe 7, which prevents the depth device 8 from being pushed out under its own weight in the passage holder for the depth device 10. To close the working well with a shut-off valve, a collet is lowered into the well using a cable technique 6, the spring consoles of which have deflecting protrusions 17. Passing under their own weight through the conical neck 9, the spring consoles deflected by the protrusions 17 are compressed and, breaking the neck 9, again get louder. With further downward movement, the collet grip with its end abuts against the movable tube 4, while the gripping teeth 16 located on the spring consoles engage on the inner groove 14 on the movable tube 4 (Fig. 2). When lifting the collet gripper 6 by cable technique, the moving to the upper position of the movable tube 4 also compresses the return spring 5. When the lower end of the movable tube 4 is higher than the flap 2, the latter closes the passage section of the housing 1 under the action of the clamping spring 3 (Fig. 3 ), thereby ensuring the closure of the well at the bottom, while the pressure under the shutter begins to increase due to the ongoing inflow from the reservoir, which is recorded by the downhole tool 8 located below the hinged shutter 2 instrument pipe 7. With a further lifting of the collet gripper 6, the deflecting protrusions 17 interact with the conical neck 9 on the housing 1, which leads to compression of the spring arms and the engaging teeth 16 to mesh with the inner groove 14 on the movable tube 4 (Fig. 4), due to whereby the collet gripper 6 is disconnected from the shut-off valve and removed from the well. After disconnecting the collet gripper 6, the pressure increased under the closed flap 2 prevents the movable tube 4 from returning 5 to return to its original position and open the flap 2. At the end of work, the shut-off valve is brought into a normally open position by equalizing the pressure above and below the flap 2. The depth device 8 can be removed using a rope technique from the shut-off valve using a special fishing tool, and the passage channel in the device holder 1 is opened 0, which allows, if necessary, to conduct well research with depth instruments with a diameter smaller than the cross section of the passage channel of the holder 10.

Claims (1)

A direct-flow borehole shutoff valve, including a housing fixed to the tubing with a saddle, a valve assembly consisting of a flap with a clamping spring, a locking device consisting of a collet gripper, a movable pipe and a return spring, characterized in that in the upper part of the housing a conical neck is made, and the shutter closure is controlled using a collet gripper, lowered by cable technique, which has gripping teeth on the spring consoles of the collet e with a groove on the movable tube, as well as deflecting protrusions interacting with the conical neck on the body, while the shut-off valve body is equipped with an instrument pipe located below the flap with side openings for receiving liquid and a through holder for the downhole device.

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