RU2293173C1 - Device for pipe closing in presence of gas, oil and water show in well - Google Patents

Abstract

FIELD: oil production, particularly sealing or packing boreholes or wells.

SUBSTANCE: device to be installed between swivel and Kelly stem comprises body with axial channel. Arranged in the axial channel is seat, which is pivotally connected with plate having fixer. Pressing bush is installed in axial channel. The pressing bush has outer thread and spring installed between the seat and the pressing bush. Fixer is made as rotary valve having projection at shaft end and pusher shaped as spiral blade. On-off cock is fastened to outer device surface below closed plate location by means of tapered thread. On-off cock interior communicates with pipe string channel. On-off cock comprises manometer connection jet and valve to close inner cavities of the cock and the device body, as well as jet to secure discharge hose and valve, which closes inner cavities of the cock and the jet.

EFFECT: increased operational reliability and safety.

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Description

The invention relates to the oil industry, in particular, to prevent gas and oil manifestations of the well.

A device for blocking pipes [1] is known, including a housing, rams installed therein with actuators in the form of hydraulic cylinders with pistons and latches of a closed position, in the supra-piston cavity with an additional drive of rams with a control unit and a safety valve, for communicating the over-piston cavity of the hydraulic cylinder with a control unit for an additional drive.

A device for lower loading liquid into transport containers [2], including a docking sleeve with a transport capacity, a shut-off valve, a sleeve with holes communicating with radial holes in the housing, a support rod mounted on the thread and having a flange for axial movement of the shut-off valve.

The disadvantages of the known devices are:

- large structural dimensions that do not allow them to be installed between the swivel and the lead pipe;

- lack of ability to control pressure in the pipes.

The closest technical solution, selected as a prototype, is a device for sealing the wellhead, installed between the swivel and the lead pipe [3], including a housing with an axial channel, in which a seat is mounted pivotally connected to the plate, a spring, a pressure sleeve, rotary shaft with a pusher having the shape of a spiral blade.

The disadvantage of the prototype is that to open the pipe channel, above the closed plate, it is necessary to create a backpressure that exceeds the pressure under the plate, which, if it is not possible to control, can create a dangerous situation and reduces the reliability of preventing gas and oil manifestations of the well.

The objective of the invention is to increase reliability and safety while preventing gas and oil manifestations of the well by providing the ability to control, relieve residual pressure under the plate and prevent the creation of back pressure above the plate.

This problem is solved due to the fact that the device is equipped with a two-position valve with valves for supplying residual pressure in the channel of the pipe string to the pressure gauge or to discharge into the receiving tank.

A comparative analysis of the proposed solution with the prototype shows that the claimed device differs from the known one in that on the outer surface of the device’s body, below the level of the closed plate, a two-position valve is fixed on the tapered thread, the internal cavity of which communicates with the pipe string channel, containing a fitting for mounting the manometer and a valve overlapping the internal cavities of the housing of the device and the tap, a fitting for attaching the discharge hose and a valve overlapping the internal cavities of the tap and the fitting. Thus, the claimed device meets the criteria of the invention of "novelty."

Known technical solutions [1, 2], in which there is no possibility of control and discharge of residual pressure, do not solve the problems of ensuring reliability and safety while preventing gas and oil manifestations, which is solved in the inventive device. This allows us to conclude that it meets the criterion of "significant differences".

The drawing shows a device for blocking pipes during gas and oil manifestation of a well, general view.

The device comprises a cylindrical housing 1 with a central axial channel and connecting threads at the ends. In the housing 1, a spring-loaded plate 3 is mounted pivotally relative to the last saddle 2. A spring-loaded plate 3 is hingedly connected to the saddle 2. In the housing 1, an annular groove with a thread is made in which the push sleeve 4 is installed. The latter has a thread on the outer side surface mating thread of the annular groove. A spring 5 is installed between the push sleeve 4 and the seat 2. The plate 3 is held in open position by means of a lock made in the form of a rotary shaft 6 with a protrusion 7 at the end. At the level of the protrusion 7 on the side surface of the shaft 6 there is a pusher 8 in the form of a spiral blade. The pusher 8 is located on the shaft 6 opposite to the protrusion 7 with the possibility of interaction with the plate 3. The shaft 6 is sealed in the housing 1 with a sleeve 9, and the seat 2 - with sealing elements 10. The plate 3 is mounted on the saddle 2 by a hinge 11. On the outer surface of the housing 1, below the level of the closed plate 3, a two-position valve 13 is fixed on the conical thread 12, the inner cavity of which communicates with the channel of the pipe string. The valve 13 comprises a fitting 14 for attaching the pressure gauge, a valve 15 overlapping the internal cavities of the housing 1 and the valve 13, a fitting 16 for attaching the discharge hose, a valve 17 overlapping the internal cavities of the valve 13 and the fitting 16.

The device operates as follows.

Before drilling, workover, or applying enhanced oil recovery (EOR) methods, the device is installed between the swivel and the lead pipe. The plate 3 is in the open position, it is held by the protrusion 7. The sensitivity of the device is regulated by the pressure sleeve 4, which compresses the spring 5. The saddle 2 is in its lower position.

At the initial stage of development, when an upward flow occurs, a pressure drop appears in the seat 2. This pressure drop pushes the seat 2 up, which is prevented by the spring 5. Together with the seat 2, the plate 3 also moves up, which at some point ceases to interact with the protrusion 7 of the shaft 6. The upward flow picks up the plate 3, it rotates on the hinge 11 and overlaps the seat 2. The inner channel of the pipe string is hermetically closed at the wellhead.

In the case when the energy of the upward flow is not enough to rotate the plate 3 after it is released from interaction with the protrusion 7, the shaft 6 is rotated. In this case, the pusher 8, interacting with the plate 3, rotates it by a certain angle, sufficient for its further rotation by the flow energy. This achieves the further landing of the plate 3 on the saddle 2.

To open the inner channel of the pipe string, it is necessary to measure the residual pressure under the plate 3 and reduce it to the pressure acting on the plate 3 by dumping certain volumes of the medium (fluids, liquids, etc.). To do this, when the valve 17 of the valve 13 is closed, valve 16 is opened and the medium filling the channel of the pipe string through the fitting 14 enters the pressure gauge. After measuring the value of the residual pressure and making a decision on the discharge of the medium, the valve 17 opens, the medium from the channel of the pipe string enters the fitting 16 and will be discharged through the hose into the receiving tank (not shown in the drawing). After reducing the pressure, the spring-loaded plate 3, turning on the hinge 11, takes its initial position. When turning the shaft 6, the plate 3 can be fixed by the protrusion 7 in the open position.

The application of the invention will increase the degree of reliability and safety while preventing gas and oil manifestations of the well by providing the ability to control the discharge of residual pressure under the plate and eliminate the creation of backpressure over the closed plate.

Information sources

1. Patent No. 123096, IPC E 21 B 35/00, 1993.

2. A.S. No. 1778065, IPC B 67 D 5/04, 1992.

3. A.S. No. 1661363, IPC E 21 B 33/03, 1991 (prototype).

Claims (1)

A device for blocking pipes during gas and oil water well manifestation, installed between the swivel and the lead pipe, comprising a housing with an axial channel in which a saddle is mounted pivotally connected to the plate, a pressure sleeve with thread on the outer surface and a spring installed between the saddle and pressure sleeve, a latch in in the form of a rotary shaft with a protrusion at the end and a pusher having the shape of a spiral blade, characterized in that on the outer surface of the device housing, below the level of the closed plate, on a tapered thread Mounting by on-off valve, the inner cavity of which communicates with the channel of the tubing fitting for the attachment comprising a manometer and a valve for closing the internal cavities of the body casing and tap fitting for attaching a hose and the blowdown valve overlap for internal cavities and tap fitting.