CN110671076A

CN110671076A - Circulating valve for whipstock

Info

Publication number: CN110671076A
Application number: CN201910875303.0A
Authority: CN
Inventors: 刘东明; 代刚; 陈�峰; 张保康; 梁聪; 王启伟; 薛宪波; 华泽君; 郝建刚; 王伟军; 何涛; 董社霞; 付强
Original assignee: China Oilfield Services Ltd; China National Offshore Oil Corp CNOOC
Current assignee: China Oilfield Services Ltd; China National Offshore Oil Corp CNOOC
Priority date: 2019-09-17
Filing date: 2019-09-17
Publication date: 2020-01-10
Anticipated expiration: 2039-09-17
Also published as: CN110671076B

Abstract

The application provides a circulating valve for whipstock, circulating valve include disk seat, case, water injection well choke, shearing pin, the disk seat cover is established the case outside, just the disk seat with the case passes through the shearing pin is fixed, the case is hollow structure, the tip of one side of case is equipped with the water injection well choke, be equipped with first intercommunicating pore on the case side, still be equipped with the second intercommunicating pore on the case side, the disk seat corresponds the position and is equipped with the third intercommunicating pore when the shearing pin is not cut, first intercommunicating pore quilt the disk seat shelters from, second intercommunicating pore and third intercommunicating pore intercommunication, when the shearing pin is cut, the case is relative the disk seat removes, inside first intercommunicating pore and the outside intercommunication of passing through of case. The application provides a circulating valve for whipstock can open the pump circulation unlimited number of times to after hanging the whipstock, enlarge circulation passage and realize the circulation of big discharge capacity.

Description

Circulating valve for whipstock

Technical Field

The present application relates to, but is not limited to, the field of whipstocks, and more particularly, to a circulation valve for a whipstock.

Background

At present, a circulating valve used for windowing an offshore oilfield whipstock can be used for 5-6 times of pumping circulation, and after the whipstock is hung, the underground milling operation can be continued only after the whipstock is subjected to pressure-holding shearing. When complex conditions in the well are met, the circulation valve cannot circulate after the pump is started for 5-6 times, so that the whipstock cannot be hung in a sitting mode. The drilling operation needs to be restarted and the tool needs to be replaced, which consumes a large period of time. Offshore oilfield drilling costs an average of about 70 ten thousand per day, with direct economic losses of 30 thousand, as at least 10 hours are required to re-trip and replace the tool.

Disclosure of Invention

The application provides a circulating valve for whipstock can open the pump circulation unlimited number of times to after hanging the whipstock, enlarge circulation passage and realize the circulation of big discharge.

The application provides a circulating valve for a whipstock, which comprises a valve seat, a valve core, a water nozzle and a shearing pin,

the valve seat is sleeved outside the valve core, the valve seat and the valve core are fixed through the shear pin, the valve core is of a hollow structure, the end part of one side of the valve core is provided with a water nozzle,

the side surface of the valve core is provided with a first communicating hole, when the shearing pin is not sheared, the first communicating hole is shielded by the valve seat, the side surface of the valve core is also provided with a second communicating hole, and a third communicating hole is arranged at a position corresponding to the valve seat.

Compared with the prior art, the method has the following beneficial effects:

different with traditional circulating valve "need suppress the pressure and just can continue the operation of milling in the pit after cuting", the circulating valve for whipstock that this application provided produces pressure differential when utilizing fluid flow water injection well choke to conduct this pressure differential to the anchoring mechanism of whipstock, make the whipstock realize sitting and hanging, can open the pump circulation many times, until the whipstock can carry out the windowing operation with correct angle, the condition of well ascending well change circulating valve in the middle of having avoided, and, after sitting and hanging the whipstock, the circulation of big discharge capacity is realized to first through-hole of accessible, be convenient for follow-up other downhole work. In addition, the circulating valve structure for the whipstock that this application provided is simple relatively, and operational reliability is high, and long service life has improved the practicality of this circulating valve greatly.

Other features and advantages of the present application will be set forth in the description that follows.

Drawings

The accompanying drawings are included to provide a further understanding of the claimed subject matter and are incorporated in and constitute a part of this specification, illustrate embodiments of the subject matter and together with the description serve to explain the principles of the subject matter and not to limit the subject matter.

FIG. 1 is a perspective view of a circulation valve for a whipstock according to an embodiment of the present disclosure (with the shear pin in an uncut state);

FIG. 2 is a perspective view of a circulation valve for a whipstock according to an embodiment of the present disclosure (shear pin in shear);

fig. 3 is a schematic structural diagram of a whipstock anchoring mechanism coupled to a circulation valve according to an embodiment of the present disclosure.

Illustration of the drawings:

1-valve seat, 11-third communication hole, 12-limiting part, 2-valve core, 21-first communication hole, 22-second communication hole, 23-abutting part, 3-water nozzle, 4-shearing pin, 5-elastic retainer ring, 6-sealing ring, 7-sealing ring, 81-slip, 82-slip push rod, 83-piston, 84-copper pin, 85-pin shearing disc, 86-compression spring and 87-throttling differential pressure.

Detailed Description

To make the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.

The embodiment of the application provides a circulating valve for whipstock, as shown in fig. 1 and fig. 2, the circulating valve includes disk seat 1, case 2, water injection well choke 3, shear pin 4, disk seat 1 cover is established in the case 2 outside, and disk seat 1 is fixed through shear pin 4 with case 2, case 2 is hollow structure, the tip of one side of case 2 is equipped with water injection well choke 3, be equipped with first intercommunicating pore 21 on the case 2 side, when shear pin 4 is not cut, first intercommunicating pore 21 is sheltered from by disk seat 1, still be equipped with second intercommunicating pore 22 on the case 2 side, disk seat 1 corresponds the position and is equipped with third intercommunicating pore 11.

The basic working process of the circulating valve is as follows: as shown in fig. 1, the initial state of the circulation valve (normal operation, the shear pin 4 is not sheared), the fluid flows from bottom to top, a certain pressure difference is generated when the fluid flows through the water nozzle 3 (the fluid flows through the water nozzle, and local pressure loss is generated due to sudden change of the cross section), and the single nozzle(s) ((The water nozzle 3) the calculation formula of the pressure difference is as follows:

wherein △ P is the throttle pressure difference (Pa) of the nozzle (water nozzle 3), and ρ is the density (kg/m) of the injected fluid³) (ii) a Q is displacement (m)³/s)；C_dIs a nozzle flow coefficient, dimensionless (i.e., physical unit-free); d is the nozzle diameter (m). According to the formula, the activation pressure of the whipstock sitting and hanging mechanism (enabling the whipstock to sit and hang) required by people can be obtained as long as the discharge capacity and the diameter of the nozzle are controlled, water nozzles 3 with different diameters can be selected for different conditions, and after the types of the water nozzles 3 are selected, the pressure difference at the position of the water nozzle 3 can be controlled by controlling the fluid discharge capacity, so that the sitting and hanging of the whipstock are realized. Specifically, the pressure difference at the water nozzle 3 is the same as the pressure at the second communication hole 22 and the third communication hole 11, the third communication hole 11 is externally connected with a pipeline and is connected with an anchoring mechanism (fig. 3 is a schematic diagram of an exemplary anchoring mechanism) of the whipstock, and the whipstock is hung by conducting the pressure difference to the anchoring mechanism. After the whipstock is hung, the fluid pressure is increased, the shearing pin 4 is sheared, the valve core 2 (and the water nozzle 3) moves upwards relative to the valve seat 1 to a set position and then stops (as shown in fig. 2), the first communication hole 21 on the side surface of the valve core 2 is not blocked by the valve seat 1 any more, the first communication hole 21 serves as a new circulation channel for fluid flow to realize large-displacement circulation, so that the fluid pressure is reduced, and other subsequent works are facilitated. After the valve core 2 is moved upwards, the positions of the second communication hole 22 and the third communication hole 11 do not correspond to each other, and the normal operation is not affected. It should be noted that the shear pin 4 may be subjected to a shear pressure that is greater than the pressure at which the fluid passes through as a whole, so that the shear pin 4 does not shear accidentally during normal operation.

The anchoring mechanism shown in fig. 3 comprises slips 81, a slip push rod 82, a piston 83, a copper pin 84, a pin shear disk 85 and a compression spring 86, and is communicated with the third communication hole 11 of the circulating valve at a throttling pressure difference 87.

In an exemplary embodiment, one of the valve seat 1 and the valve element 2 is provided with a limit portion 12, the other is provided with an abutting portion 23, and the limit portion 12 can abut against the abutting portion 23. In one example, the valve seat 1 is provided with a limiting part 12, and the limiting part 12 is a screw; the valve body 2 is provided with an abutting portion 23, and the abutting portion 23 has an annular step structure. When the limit screw moves to the abutting portion 23, the limit screw is stopped by the step structure, and the valve core 2 is limited and fixed at the position.

In an exemplary embodiment, the number of the screws is plural, and the screws are arranged at intervals in the circumferential direction. The abutting part 23 is of an annular step structure, and the number of the screws is set to be multiple, so that the reliability of limiting is guaranteed.

In an exemplary embodiment, a groove is formed on the valve element 2, a through hole is formed in a corresponding position of the valve seat 1, and the cutting pin 4 is inserted into the groove through the through hole, so that the valve seat 1 and the valve element 2 are relatively fixed. The number of the shear pins 4 is plural and is arranged at intervals in the circumferential direction.

The shear pin 4 is inserted into the valve core 2 through the valve seat 1, and when the shear pin 4 is sheared, the shear pin is sheared along the contact surface of the valve seat 1 and the valve core 2. Shear pin 4 sets up to a plurality ofly according to required shear pressure, and shear pin 4 can be interference fit with the contact of disk seat 1 to guarantee that shear pin 4 can not deviate from, perhaps, shear pin 4 fixes in disk seat 1 and case 2 with threaded connection's mode screw in.

In an exemplary embodiment, the circulation valve further comprises a circlip 5, the circlip 5 mounting the water nozzle 3 at the end of the valve element 2.

The water injection well choke 3 is installed at case 2 tip, and 3 one end of water injection well choke is spacing by the stair structure in case 2, and the other end passes through circlip 5 spacingly to with 3 fixed mounting in the one end of case 2 of water injection well choke. The elastic retainer ring 5 is used for fixing, so that the water nozzle 3 is convenient to disassemble, assemble and replace.

In an exemplary embodiment, a sealing ring 6 is arranged between the water nozzle 3 and the valve core 2.

A sealing ring 6 is arranged between the water nozzle 3 and the valve core 2 to improve the sealing performance between the water nozzle and the valve core, so that fluid is prevented from flowing through a gap between the water nozzle and the valve core, and the pressure difference at the position of the water nozzle 3 is guaranteed to be accurately calculated.

In an exemplary embodiment, the number of the second communication holes 22 and the third communication holes 11 is the same, and each is provided in plurality, each being provided at intervals in the circumferential direction.

The plurality of second communication holes 22 and the plurality of third communication holes 11 improve the efficiency of the fluid flowing to the anchoring mechanism, and ensure the fluid flow rate.

In an exemplary embodiment, a plurality of sealing rings 7 are provided between the valve element 2 and the valve seat 1.

A plurality of sealing rings 7 are arranged between the valve core 2 and the valve seat 1 to improve the sealing performance between the valve core 2 and the valve seat and prevent fluid from flowing out from a contact gap between the valve core 2 and the valve seat and influencing the pressure of the fluid in the valve core 2. In fig. 1 and 2, only a few sealing rings are exemplarily labeled, not all sealing rings are labeled.

In the description of the present application, it should be noted that the terms "plurality" refer to two or more, and the directions or positional relationships indicated by the terms "upper", "lower", "one side", "the other side", "one end", "the other end", "left", "right", and the like are based on the directions or positional relationships shown in the drawings, and are only for convenience of describing the present application and simplifying the description, but do not indicate or imply that the structures referred to have a specific direction, are configured and operated in a specific direction, and thus cannot be construed as limiting the present application.

In the description of the embodiments of the present application, unless expressly stated or limited otherwise, the terms "connected," "connected," and "mounted" are to be construed broadly, e.g., the term "connected" may be a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

The embodiments described herein are exemplary rather than limiting and it will be apparent to those of ordinary skill in the art that many more embodiments and implementations are possible within the scope of the embodiments described herein. Although many possible combinations of features are shown in the drawings and discussed in the detailed description, many other combinations of the disclosed features are possible. Any feature or element of any embodiment may be used in combination with or instead of any other feature or element in any other embodiment, unless expressly limited otherwise.

The present application includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The embodiments, features and elements that have been disclosed in this application may also be combined with any conventional features or elements to form unique aspects as defined by the claims. Any feature or element of any embodiment may also be combined with features or elements from other aspects to form another unique aspect as defined by the claims. Thus, it should be understood that any of the features shown and/or discussed in this application may be implemented alone or in any suitable combination. Accordingly, the embodiments are not limited except as by the appended claims and their equivalents. Furthermore, various modifications and changes may be made within the scope of the appended claims.

Claims

1. A circulating valve for a whipstock is characterized by comprising a valve seat, a valve core, a water nozzle and a shearing pin,

the side surface of the valve core is provided with a first communicating hole, the side surface of the valve core is also provided with a second communicating hole, a third communicating hole is arranged at a position corresponding to the valve seat, when the shearing pin is not sheared, the first communicating hole is shielded by the valve seat, the second communicating hole is communicated with the third communicating hole, when the shearing pin is sheared, the valve core moves relative to the valve seat, and the interior of the valve core is communicated with the outside through the first communicating hole.

2. The circulation valve for a whipstock as claimed in claim 1, wherein one of said valve seat and said valve element is provided with a stopper portion, and the other is provided with an abutting portion, wherein said stopper portion and said abutting portion are spaced apart by a predetermined distance when said shear pin is not sheared, and wherein said abutting portion abuts against said stopper portion when said shear pin is sheared.

3. The circulation valve for a whipstock of claim 2, wherein the valve seat is provided with the stopper portion, the stopper portion being a screw; the valve core is provided with the abutting part which is of an annular step structure.

4. The circulation valve for a whipstock of claim 3, wherein the number of screws is plural.

5. The circulation valve for a whipstock as claimed in claim 1, wherein the valve element has a recess, the valve seat has a through hole at a corresponding position, and the shear pin is inserted into the recess through the through hole to fix the valve seat and the valve element relative to each other.

6. The circulation valve for a whipstock of claim 5, wherein the number of shear pins is plural.

7. The circulation valve for a whipstock of any one of claims 1 to 6, further comprising a circlip mounting the water tap at an end of the spool.

8. The circulation valve for a whipstock of claim 7, wherein a sealing ring is disposed between the water nozzle and the valve element.

9. The circulation valve for a whipstock as claimed in any one of claims 1 to 6, wherein the number of the second communication holes and the third communication holes is the same and provided in plurality.

10. The circulation valve for a whipstock of any one of claims 1 to 6, wherein a plurality of sealing rings are provided between the spool and the valve seat.