RU2334866C1 - Device for simultaneous-separate operation of multypay well - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: invention refers to oil and gas industry and can be used at operation of multypay wells for separate as well as for simultaneous working. The invention facilitates simplification of the design, reduction of costs for opening-closing of valves and also excludes back flow of well liquid into a bed during the well shutdown. The essence of the invention is as follows: the device contains a fitting with holes arranged opposite to each of producing beds pressure tight pressure tight separated from one another with packers. Valves are located outside the fitting opposite to each of its holes; each valve consists of a case with a side channel, of a spring, loaded from below a saddle, and installed pressure tight into the case, of a guiding pin and a ball, arranged on the saddle. A closed groove is made on the exterior surface of the saddle; the said groove consists of alternate short and long cuts, while the guiding pin is on one side rigidly fixed with the case, while on the other side it is placed in the closed groove of the saddle and is designed to move along the trajectories of alternate short and long cuts under the effect of the above hydraulic pressure. At that the valve is closed when the guiding pin is in the short cut of the closed groove of the saddle, and is open when the guiding pin is in the long cut of the closed groove of the saddle.

EFFECT: design simplification of device and reduction of costs for valve opening-closing as well as exclusion of back flow of well liquid into bed during well shut down.

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Description

The invention relates to the oil and gas industry and can be used in the operation of multilayer wells, both for separate production of layers, and for simultaneous.

The known method of simultaneous and separate operation of a multilayer well and a receiving valve for periodically shutting off the flow from the reservoirs (RF patent for the invention No. 2161698, IPC 7 Е21В 43/14; ЕВВ 34/06, published in Bulletin No. 1 of January 10, 2001 ), consisting of a housing that is part of the production casing, a spool with receiving holes and a spring installed under the spool end, with stops made on the ends of the spool, one of which, in a stable position of the valve, enters the groove in the housing with two alternating about the depth by the types of grooves, which determines the state of displacement of the spool holes relative to the holes in the body, and the stop of the other end of the spool when switching the valve enters the groove with curved grooves in the body on the other hand, which ensures its rotation in the axial direction.

The disadvantage of this device is that the opening-closing of the receiving valves occurs when a pressure pulse is applied to the hydraulic pump, which injects the working fluid into the production string, and each receiving valve has an individual element that determines the threshold for its operation and has a certain sequence, the violation of which, for example, when abrupt a jump in the pressure pulse can lead to a malfunction of the receiving valves, that is, it will not be certain in which of the stable positions it is “open” or “closed” Each inlet valve is included.

The closest in technical essence and the achieved result to the proposed one is a device for the simultaneous operation of several productive formations of one well (copyright certificate SU No. 907225, IPC 7 Е21В 43/14; published in bulletin No. 7 of 02.23.1982), made in the form of regulating valve bushings located in the housing part, provided with passage channels and gripping elements and controlled from the day surface by means of a control mechanism provided with a reciprocal gripping element, while gripping elements of cl pannyh sleeves arranged above the flow channels, and the control mechanism is configured in the form of two spring-loaded radially and kinematically interconnected half sleeves, which is situated the gripping element control mechanism.

The disadvantages of this design are:

- firstly, the complexity of the design of the device associated with a large number of nodes and parts, in particular, the complicated design of the valve bushings and the control mechanism, and this leads to a rise in the cost of manufacturing the device and its cost in general;

- secondly, for opening and closing valve valve sleeves in the well, it is necessary to carry out tripping operations of the control mechanism, for which it is necessary to attract repair or geophysical teams, and this requires additional costs;

- thirdly, after stopping the operation of the well, produced well fluid that is in the well, randomly returns back through the openings of the body to the productive formations, the valve sleeves of which are open, while the bottomhole zone of the formations is clogged, which reduces the overall oil production rate.

An object of the invention is to simplify the design of the device, as well as reducing the cost of opening and closing valves and eliminating the return of well fluid into the formation during the shutdown of the well.

The technical task is solved by a device for simultaneous and separate operation of a multilayer well containing a pipe with holes located opposite each of the productive formations, hermetically separated by packers.

What is new is that outside the nozzle, opposite each of its openings, valves are placed, each of which consists of a body with a side channel, a spring-loaded bottom of the seat, hermetically placed in the body, a guide pin and a ball mounted on the seat, and on the outer surface of the seat there is a closed a groove consisting of alternating short and long grooves, and a guide pin on one side is rigidly connected to the housing, and on the other hand is placed in a closed groove of the saddle with the ability to move along the trajectories of alternating short and long grooves under the action of hydraulic pressure from above, while the valve is closed when the guide pin is located in the short groove of the closed seat groove, and when the guide pin is placed in the long groove of the closed seat groove, the valve is open.

The figure 1 shows the proposed device for simultaneous and separate operation of a multilayer well.

Figure 2 shows the check valve in the open position.

The figure 3 shows a closed groove made on the outer surface of the saddle in the form of alternating short and long grooves.

A device for simultaneous and separate operation of a multilayer well (in this example, figure 1 shows a well with three productive formations) contains a pipe 1 with holes 2; 2 '; 2 '', made in front of each reservoir 3; 3 '; 3 ''. The pipe 1 may consist of a string of pipes, for example a string of tubing.

Each of the productive formations 3; 3 '; 3 '' in the well 4 is hermetically separated from each other by packers 5; 5'; 5''. Outside of the pipe 1 opposite each of its holes 2; 2 '; 2 '' installed respectively valves 6; 6 '; 6 ''. Each of the valves 6; 6 '; 6 '', for example, valve 6 (see FIG. 2), consists of a housing 7 with a lateral channel 8, spring-loaded from below by means of a spring 9 of the seat 10, hermetically by means of sealing elements 11 located in the housing 7, a guide pin 12 and a ball 13 mounted on the saddle 10.

On the outer surface of the seat 10, a closed groove 14 is made (see FIGS. 2 and 3), consisting of alternating short 15 and 16 long grooves (see FIG. 3), and the guide pin 12 is rigidly connected to the housing 7 on one side and, on the other hand, is placed in a closed groove 14 of the saddle 10 with the possibility of moving along the trajectory of alternating short 15 and long 16 grooves by the action of hydraulic pressure from above created in the well and, accordingly, in valves 6; 6 '; 6 '' by means of a pump (for example, the CA-320 pumping unit, which is widely used in well repair).

A device for simultaneous-separate operation of a multilayer well works as follows.

A device for simultaneous and separate operation of a multilayer well is mounted in the well 4, as shown in figure 1, each of the valves 6; 6 '; 6 '' is open, that is, the internal space of the well 4 communicates with the productive formations 3; 3 '; 3 ''. For example, the guide pin 12 of the valve 6 is placed in a long groove 16 of the closed groove 14 of the seat 10 (see figure 3), that is, the side channel 8 (see figure 2) of the housing 7 of the valve 6 communicates with the inner space of the pipe 1 and, accordingly, wells 4 (see figure 1).

Next, a pump 18 of any known construction (for example, an electric centrifugal pump) is lowered into a well 4 on a pipe string 17. Then start the well 4 in operation. In this case, the simultaneous operation of all three layers 3; 3 '; 3 '', i.e., the pump 18 pumps the produced well fluid from the well 4 to the surface. Suppose that during the operation one layer is flooded, for example, productive layer 3, which sharply increases the water cut of the produced well fluid. In order to reduce the water content of the produced well fluid, it becomes necessary to shut off the reservoir 3.

To do this, stop the well 4 and remove from it the string of pipes 17 with the pump 18, while the valves 6; 6 '; 6 '' (see FIGS. 1 and 2) due to balls 13 (see FIGS. 1 and 2) and balls 13 '; 13 '' (conventionally shown in Fig. 1) exclude the back flow of the wellbore fluid into the corresponding reservoirs 3; 3 '; 3 '', while there is no mudding of the bottomhole formation zone and the planned total oil production rate does not decrease.

Then, the mouth of the well 4 is tied with a pump (not shown in FIGS. 1, 2, 3) and a hydraulic pressure is created in the well 4 (see FIGS. 1 and 2), for example 12.0 MPa, corresponding to its response threshold (spring compression 9 with the possibility of moving the guide pin from the long groove of the closed groove 14 (see Fig. 3) to the short groove 15 of the closed groove 14 of the seat 10 of the valve 6), that is, the closing of the valve 6, while this hydraulic pressure acts through the pipe 2 on the valve 6; 6 '; 6 '' and, in particular, to valve 6.

As a result, the ball 13 (see figure 2) and the seat 10 of the valve 6 are moved down relative to the housing 7, rigidly connected to the pipe 1, compressing the spring 9, at this moment the guide pin 12 of the long groove 16 (see figure 3) closed the groove 14 is moved into the short groove 15 of the closed groove 14 of the seat 10 of the valve 6, while the lateral channel 8 of the housing 7 of the valve 6 is sealed by the seat 10 and the valve 6 is closed. As a result, the reservoir 3 is disconnected from the communication with the internal space of the well 4, and the reservoir 3 '; 3 '' continue to communicate with the interior of the borehole 4.

Then again, into the well 4 (see FIG. 1), on the pipe string 17, a pump 18 of any known design is lowered, for example, a sucker rod pump, and the well 4 is continued to operate. If necessary, open the valve 6 during the subsequent operation, the above operations are repeated.

If necessary, close the other valves 6 '; 6 '' the above operations are repeated, but at the same time, the hydraulic pressure created in the well 4 must be greater than the hydraulic pressure equal to 12.0 MPa and corresponding to the response threshold of valve 6, for example, for valve 6 '- 14.0 MPa, and for valve 6 '' - 16, MPa.

The proposed device for simultaneous and separate operation of a multilayer well has a simple design, and the use of a pump located at the wellhead to open and close valves reduces valve control costs, that is, tripping operations of the control mechanism into the well are eliminated involving a repair or geophysical team , while there is no back flow of the wellbore fluid into the formation during the shutdown of the well, which eliminates the mudding of the bottom-hole zone of the formation and not zhaet planned total production rate of oil.

Claims (1)

A device for simultaneously separately operating a multilayer well, comprising a nozzle with holes located opposite each of the reservoirs, hermetically separated by packers, characterized in that valves are placed outside the nozzle opposite each of its holes, each of which consists of a body with a side channel, a spring-loaded lower saddle, sealed in the housing, a guide pin and a ball mounted on the saddle, and on the outer surface of the saddle is made closed h, consisting of alternating short and long grooves, and the guide pin on one side is rigidly connected to the body, and on the other hand is placed in a closed groove of the saddle with the ability to move along the trajectory of alternating short and long grooves under the action of hydraulic pressure from above, at the same time, when the guide pin is located in the short groove of the closed groove of the saddle, the valve is closed, and when the guide pin is placed in the long groove of the closed groove of the saddle, the valve is open.

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