CN207177805U - A device for slowing down the wear of rubber core of annular blowout preventer - Google Patents

Abstract

The utility model discloses a slow down device of annular preventer rubber core wearing and tearing belongs to oil field machinery. The device includes: self-sealing seat body, self-sealing rubber core, gland. The self-sealing seat body is provided with a cavity for accommodating an oil pipe, and the lower end of the self-sealing seat body is detachably connected with the fixed slips; the self-sealing rubber core is arranged in the self-sealing seat body and is used for enabling the oil pipe to penetrate through in a dynamic sealing manner; the gland is provided with the cavity that is used for holding oil pipe, can dismantle with the upper end of proclaiming oneself the seat body and be connected for compress tightly proclaiming oneself the rubber core. The device is simple to operate when the device is used for carrying out pressurized workover treatment, the rubber core of the annular blowout preventer can be fully utilized, the abrasion of the rubber core of the annular blowout preventer is slowed down, and the operation cost is reduced.

Description

A device for slowing down the wear of rubber core of annular blowout preventer

technical field

The utility model relates to the field of oilfield machinery, in particular to a device for slowing down the rubber core wear of an annular blowout preventer.

Background technique

In oil well workover operations under pressure, it is necessary to trip strings (such as drill pipes, tubing, etc.). In the process of tripping the pipe string, in order to prevent the oil, gas and water between the tubing and the casing from spraying upward, it is necessary to install a blowout preventer at the wellhead. In the annular BOP, the rubber core of the annular BOP arranged in the inner cavity of the annular BOP acts as a dynamic sealing oil pipe, so the rubber core of the annular BOP is easily worn during the process of lifting the pipe string. The worn rubber core of the annular blowout preventer has poor dynamic sealing effect, which may easily cause oil, gas, and water leakage, and cause safety accidents in severe cases. Therefore, it is very necessary to slow down the wear of the rubber core of the annular blowout preventer. Based on the above, it is very necessary to provide a method or device for reducing the wear of the rubber core of the annular blowout preventer.

The prior art provides a method for slowing down the wear of the rubber core of the annular blowout preventer. The method is specifically: during the workover operation under pressure, the pressure in the well is monitored in real time. According to the pressure in the well, adjust the pressure in the blowout preventer in real time to change the tightness of the annular cavity between the rubber core dynamic seal oil pipe of the annular preventer and the wellhead, and then make full use of the blowout preventer to slow down the blowout preventer The wear of the rubber core reduces the operating cost. For example, when the pressure in the well is small, the tightness of the annular cavity between the rubber core of the control ring blowout preventer and the wellhead is small. On the contrary, control the tightness of the annular cavity between the rubber core of the annular blowout preventer and the wellhead to dynamically seal the oil pipe. In a specific application, the fixed slip communicates with the upper end of the annular blowout preventer, and the oil pipe is clamped tightly by controlling the fixed slip to facilitate the connection or disassembly of the oil pipe.

The designer finds that the prior art has at least the following problems:

The method provided by the prior art is cumbersome, inconvenient to operate, difficult to control the sealing degree of the rubber core of the blowout preventer, and has a poor effect of slowing down the wear of the rubber core of the blowout preventer.

Utility model content

In order to solve the problems in the prior art, the embodiment of the utility model provides a device that is easy to operate and has a good effect in slowing down the wear of the rubber core of the annular blowout preventer. Described technical scheme is as follows:

The embodiment of the utility model provides a device for slowing down the wear of the rubber core of the annular blowout preventer. The device includes: a self-sealing seat body, a self-sealing rubber core, and a gland;

The body of the self-sealing seat is provided with a cavity for accommodating the oil pipe, and the lower end is detachably connected with the fixed slip;

The self-sealing rubber core is arranged in the self-sealing seat body, and is used to make the oil pipe pass through in a dynamic and sealed manner;

The gland is provided with a cavity for accommodating the oil pipe, which is detachably connected to the upper end of the self-sealing seat body, and is used for compressing the self-sealing rubber core.

Specifically, preferably, the self-sealing rubber core includes: a connecting section and a sealing section connected from top to bottom;

The outer diameter of the connecting section is larger than the outer diameter of the sealing section;

The lower end of the connecting section is detachably connected to the upper end of the self-sealing seat body, and the upper end of the connecting section is against the gland;

The sealing section is arranged in the self-sealing seat body, and is used for allowing the oil pipe to pass through in a dynamic and sealed manner.

Specifically, as a preference, the inner cavity of the self-sealing seat body includes: an inverted conical cavity and a cylindrical cavity connected from top to bottom;

The sealing section is in the structure of an inverted frustum, and the upper outer wall is in contact with the inner wall of the inverted frustum cavity.

Specifically, as a preference, the inner cavity of the sealing section is in the shape of an inverted truncated cone, and the lower part is used to allow the oil pipe to pass through in a dynamic and sealed manner.

Specifically, preferably, the lower end of the connecting section is engaged with the upper end of the self-sealing seat body.

Specifically, preferably, the lower end surface of the connecting section is provided with an annular locking body coaxial with the self-sealing rubber core;

The upper end surface of the self-sealing seat body is provided with an annular engaging groove coaxial with the self-sealing seat body;

The annular locking body is engaged with the annular locking groove.

Specifically, preferably, the groove width of the annular locking groove gradually decreases from top to bottom;

The annular clamping body has a structure adapted to the annular clamping groove.

Specifically, preferably, a limiting groove is provided at the lower end of the gland, and the top wall and the side wall of the connecting section respectively abut against the top wall and the side wall of the limiting groove.

Specifically, preferably, the self-sealing seat body includes: an upper connection section, a middle section, and a lower connection section connected from top to bottom;

Both the outer diameters of the upper connecting section and the lower connecting section are larger than the outer diameter of the middle section;

A plurality of bolt assemblies are used to connect the upper connecting section and the gland;

A plurality of bolt assemblies are used to connect the lower connecting section and the fixed slips.

The beneficial effects brought by the technical solution provided by the embodiment of the utility model are:

The device for slowing down the abrasion of the rubber core of the annular blowout preventer provided by the embodiment of the utility model is that the lower end of the self-sealing seat body is detachably connected with the fixed slips, and a self-sealing rubber core is provided in the self-sealing seat body to allow the oil pipe to dynamically seal and pass through. , so that it can be used alone in the hot workover operation below 7MPa, thereby reducing the frequency of use of the annular blowout preventer, slowing down the wear of the rubber core of the annular blowout preventer, and reducing operating costs. In the workover operation with pressure higher than 7MPa, control the device and the annular blowout preventer to work at the same time, or make the annular blowout preventer work independently, so as to make full use of the rubber core of the annular blowout preventer. It can be seen that the device provided by the embodiment of the utility model is easy to operate in the hot workover operation, can make full use of the rubber core of the annular blowout preventer, has a good effect of slowing down the wear of the rubber core of the annular blowout preventer, and reduces the operating cost.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some implementations of the present invention. For example, those of ordinary skill in the art can also obtain other drawings based on these drawings on the premise of not paying creative efforts.

Fig. 1 is a positional diagram of the device for slowing down the wear of the rubber core of the annular blowout preventer provided by the embodiment of the utility model and the fixed slips, the blowout preventer and the oil pipe;

Figure 2-1 is a schematic diagram of the first structure of the self-sealing rubber core provided by the embodiment of the present invention;

Fig. 2-2 is a second structural schematic diagram of the self-sealing rubber core provided by the embodiment of the present invention;

Fig. 3 is a half-sectional view of the self-sealing seat body provided by the embodiment of the present invention;

Fig. 4 is a schematic structural view of the gland provided by the embodiment of the present invention.

Wherein, the reference signs represent respectively:

1 Self-sealing seat body,

101 ring clamping groove,

1a upper connecting segment,

1b middle section,

1c lower connection section,

2 self-sealing rubber cores,

201 connection segment,

2011 ring clip body,

202 sealing section,

3 glands,

301 limit slot,

4 tubing,

5 fixed slips,

6 Annular BOP.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present utility model clearer, the implementation of the present utility model will be further described in detail below in conjunction with the accompanying drawings.

The embodiment of the utility model provides a device for slowing down the wear of the rubber core of the annular blowout preventer. As shown in Figure 1 , the device includes: a self-sealing seat body 1 , a self-sealing rubber core 2 , and a gland 3 . The self-sealing seat body 1 is provided with a cavity for accommodating the oil pipe 4, and the lower end is detachably connected with the fixed slip 5; the self-sealing rubber core 2 is arranged in the self-sealing seat body 1, and is used to make the oil pipe 4 pass through in a dynamic and sealed manner; the gland 3 is provided with a cavity for accommodating the oil pipe 4, which is detachably connected with the upper end of the self-sealing seat body 1, and is used for pressing the self-sealing rubber core 2.

It should be noted that the pressure bearing capacity of the self-sealing rubber core 2 is lower than that of the annular blowout preventer rubber core, the price is low, and it can be applied to workover operations under pressure below 7MPa.

In the embodiment of the present utility model, the fixed slip 5 is generally arranged on the annular blowout preventer 6, and it and the annular blowout preventer 6 are respectively the fixed slip and the annular blowout preventer commonly used in the field. Specifically, by controlling the movement of the piston in the fixed slip 5, the tooth block connected to the end of the piston is driven to clamp or loosen the oil pipe, thereby facilitating the lifting of the pipe string. By hydraulically controlling the rubber core of the annular blowout preventer in the annular blowout preventer 6, it can dynamically seal the oil pipe when it is working, and keep away from the oil pipe when it is not working.

Studies have shown that in about two-thirds of oil well workover operations under pressure, the pressure in the well is lower than 7MPa. At this time, the requirements for oil well blowout prevention operations are relatively low. If the annular blowout preventer 6 is used at this time, its application value is low Because of the wear and tear of the expensive rubber core. Therefore, it is necessary to achieve: when the pressure in the well is lower than 7MPa, the annular blowout preventer 6 will not work (slow down the wear of the rubber core), and at the same time, the requirements for the operation under pressure can be guaranteed; and, when the pressure in the well is higher than 7MPa, the annular BOP 6 works.

In order to solve the above technical problems, the embodiment of the utility model provides a device for slowing down the wear of the rubber core of the annular blowout preventer. The working principle of the device provided by the embodiment of the present invention is described below:

In application, the self-sealing seat body 1 is set on the oil pipe 4, and the oil pipe 4 is passed through the self-sealing rubber core 2 arranged in the self-sealing seat body 1 in a dynamic and sealed manner, and then the lower end of the self-sealing seat body 1 is connected to the fixed slip 5 Detachable connection, the gland 3 set on the oil pipe 4 is detachably connected with the upper end of the self-sealing seat body 1 to compress the self-sealing rubber core 2 .

The pressure in the target oil well is monitored in real time. When the pressure is lower than 7MPa, the annular blowout preventer 6 is hydraulically controlled not to work, and only the device is allowed to work. During the working process of the device, since the self-sealing rubber core 2 dynamically seals the tubing 4 to pass through, that is, the device can dynamically seal the annular cavity between the tubing 4 and the wellhead, avoiding oil, gas, water, etc. in the well. out. During the tripping and unloading process, the oil pipe 4 and other tubing strings only rub against the self-sealing rubber core 2, and the annular blowout preventer rubber core does not participate in the work, which reduces the frequency of using the blowout preventer rubber core. When the pressure in the target oil well is higher than 7MPa, the annular blowout preventer 6 is controlled to work simultaneously with the device, or the device is disassembled, and only the annular blowout preventer 6 is allowed to work.

When the device provided by the embodiment of the present invention, the annular blowout preventer 6, or both are working at the same time, the oil pipe 4 is clamped or loosened by controlling the fixed slip 5, so as to facilitate lifting and lowering of multiple oil pipes 4.

The device for slowing down the wear of the rubber core of the annular blowout preventer provided by the embodiment of the utility model is to detachably connect the lower end of the self-sealing seat body 1 with the fixed slip 5, and set the oil pipe 4 in the self-sealing seat body 1 so that the oil pipe 4 can be dynamically sealed and passed through. The self-sealing rubber core 2 can be used alone in the hot workover operation below 7MPa, thereby reducing the frequency of use of the annular blowout preventer 6, slowing down the wear of the annular blowout preventer rubber core, and reducing operating costs. In the workover operation with pressure higher than 7MPa, the device is controlled to work simultaneously with the annular blowout preventer 6, or the annular blowout preventer 6 works alone, so as to make full use of the rubber core of the annular blowout preventer. It can be seen that the device provided by the embodiment of the utility model is easy to operate in the hot workover operation, can make full use of the rubber core of the annular blowout preventer, has a good effect of slowing down the wear of the rubber core of the annular blowout preventer, and reduces the operating cost.

The self-sealing rubber core 2 can be set in various structures, on the premise that it is easy to be arranged in the self-sealing seat body 1, and the oil pipe 4 can pass through in a dynamic and sealed manner, as shown in Figure 2-1 and Figure 2-2 , the self-sealing rubber core 2 includes: a connecting section 201 and a sealing section 202 communicated from top to bottom, the outer diameter of the connecting section 201 is larger than the outer diameter of the sealing section 202; the lower end of the connecting section 201 is detachably connected with the upper end of the self-sealing seat body 1 , and the upper end of the connecting section 201 is against the gland 3; the sealing section 202 is set in the self-sealing seat body 1, and is used to make the oil pipe 4 pass through in a dynamic and sealed manner.

The inner cavity of the self-sealing seat body 1 and the sealing section 202 of the self-sealing rubber core 2 can be arranged in a variety of mutually cooperative structures, for example, the inner cavity of the self-sealing seat body 1 and the sealing section 202 of the self-sealing rubber core 2 can be set as a cylindrical structure , or other structures, etc. Wherein, when the sealing section 202 has a cylindrical structure, refer to Fig. 2-1. As a preference, as shown in Figure 3, the inner cavity of the self-sealing seat body 1 includes: an inverted conical cavity and a cylindrical cavity connected from top to bottom; the sealing section 202 is an inverted conical structure, and the upper outer wall is against the inner wall of the inverted conical cavity .

In this way, when the pressure in the well increases, the pressure in the well acts on the lower end of the sealing section 202 and the lower part of the outer wall, while the lower end of the connecting section 201 is detachably connected to the upper end of the self-sealing seat body 1, and the upper end of the connecting section 201 is connected to the gland 3 offset each other, so the sealing section 202 further dynamically seals the oil pipe 4 under the action of pressure, so as to avoid leakage of oil, gas, water, etc. in the well from the gap between the oil pipe 4 and the self-sealing rubber core 2 when the pressure in the well increases.

Wherein, the size of the inner diameter of the inverted conical cavity and the outer diameter of the inverted conical cylinder are gradually reduced from top to bottom.

In order to facilitate the oil pipe 4 to pass through the self-sealing rubber core 2, and under the action of the pressure in the well, the sealing section 202 can expand or move in the radial direction to further dynamically seal the oil pipe 4, as shown in Figure 2-2, the sealing section The inner cavity of 202 is an inverted circular truncated structure, and the lower part is used to make the oil pipe 4 pass through in a dynamic and sealed manner.

After the self-sealing rubber core 2 is worn out, in order to facilitate replacement of the self-sealing rubber core 2 , the lower end of the connecting section 201 is engaged with the upper end of the self-sealing seat body 1 .

There are many ways to engage the lower end of the connecting section 201 with the upper end of the self-sealing seat body 1, and two specific examples are given below:

As a first example, the lower end surface of the connecting section 201 is provided with an annular clamping body 2011 coaxial with the self-sealing rubber core 2; Groove 101; the ring clamping body 2011 is clamped with the ring clamping groove 101.

The annular clamping body 2011 and the annular clamping groove 101 are provided to facilitate the accurate alignment of the clamping body and the clamping groove when the self-sealing rubber core 2 and the self-sealing seat body 1 are clamped, and at the same time play a sealing role.

The cross-sections of the annular locking body 2011 and the annular locking groove 101 can be set in various structures, such as square, triangular and so on. Preferably, as shown in FIG. 3 , the groove width of the annular locking groove 101 gradually decreases from top to bottom; It can be understood that, the cross section of the annular locking groove 101 is an inverted trapezoidal structure, and the cross section of the annular locking body 2011 is a trapezoidal structure.

The structure of the annular clamping body 2011 and the annular clamping groove 101 is arranged in this way, which facilitates the insertion of the annular clamping body 2011 into the annular clamping groove 101, or pulls out from the annular clamping groove 101, thereby facilitating the self-sealing rubber core 2 and the self-sealing seat body 1 disassembly.

As a second example, the lower end surface of the connecting section 201 is provided with a plurality of engaging bodies along the circumference; the upper end surface of the self-sealing seat body 1 is provided with a plurality of engaging grooves; the engaging bodies are engaged with the engaging grooves.

The multiple clamping bodies and the multiple clamping grooves are respectively clamped to realize the clamping between the self-sealing rubber core 2 and the self-sealing seat body 1 .

Specifically, various structures of the locking body and the locking groove can be set, for example, the cross sections of both are square, arc, triangular, trapezoidal and so on. On the premise of easy disassembly and assembly of the two, the cross-section of the clamping body is an isosceles trapezoidal structure, and the cross-section of the clamping groove is an inverted isosceles trapezoidal structure.

Under the action of well pressure, in order to prevent the self-sealing rubber core 2 from moving radially outward and affecting the performance of its sealing tubing 4, as shown in Figure 4, the lower end of the gland 3 is provided with a limiting groove 301, and the connecting section 201 The top wall and the side wall are respectively against the top wall and the side wall of the limiting groove 301 to limit the position of the self-sealing rubber core 2 .

The outer contour structure of the self-sealing seat body 1 can be set in various types. In order to facilitate the detachable connection between it and the gland 3 and the fixed slip 5, the following specific examples are given:

As shown in Figure 3, the self-sealing seat body 1 includes: an upper connection section 1a, a middle section 1b, and a lower connection section 1c connected from top to bottom; The outer diameter is large; the upper connecting section 1a is connected to the gland 3 by multiple bolt assemblies; the lower connecting section 1c is connected to the fixed slip 5 by multiple bolt assemblies.

Setting the outer diameters of the upper connecting section 1a and the lower connecting section 1c to be larger than the outer diameter of the middle section 1b facilitates the setting of through holes on the upper connecting section 1a and the lower connecting section 1c, thereby facilitating the use of multiple bolt assemblies to respectively connect the upper connecting sections 1a and 1c. The segment 1a is detachably connected to the gland 3, and the lower connecting segment 1c is detachably connected to the fixed slip 5. Moreover, the method of realizing the above-mentioned detachable connection by using the bolt assembly is easy to set up and easy to assemble and disassemble.

Specifically, the upper connecting section 1 a and the lower connecting section 1 c are respectively provided with a plurality of through holes, the gland 3 is provided with a plurality of through holes, and the fixing slip 5 is provided with a plurality of through holes. Through a plurality of bolts respectively penetrated into the upper connecting section 1a and a plurality of opposite through holes on the gland 3, and are set on each bolt, and respectively resist the lower end of the upper connecting section 1a and the upper end of the gland 3 The two nuts are locked and fixed. By passing a plurality of bolts into the lower connection section 1c and a plurality of opposite through holes on the fixed slips 5, and being fitted on each bolt, and respectively connecting with the upper end of the lower connection section 1c and the upper end of the fixed slip 5 The two offset nuts are locked and fixed.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (9)

1. a kind of device for slowing down the abrasion of annular preventer glue core, it is characterised in that described device includes：Self-styled seat body (1), Self-sealing rubber core (2), gland (3)；

The self-styled seat body (1) is provided with the cavity for accommodating oil pipe (4), and lower end detachably connects with stationary slip (5) Connect；

The self-sealing rubber core (2) is arranged in the self-styled seat body (1), for passing through with making the oil pipe (4) dynamic sealing；

The gland (3) is provided with the cavity for accommodating the oil pipe (4), removable with the upper end of the self-styled seat body (1) Connection is unloaded, for compressing the self-sealing rubber core (2).

2. device according to claim 1, it is characterised in that the self-sealing rubber core (2) includes：The company connected from top to bottom Connect section (201) and seal section (202)；

The external diameter of the linkage section (201) is more than the external diameter of the seal section (202)；

The lower end of the linkage section (201) and the upper end of the self-styled seat body (1) are detachably connected, and the linkage section (201) upper end offsets with the gland (3)；

The seal section (202) is arranged in the self-styled seat body (1), and for passing through with making the oil pipe (4) dynamic sealing.

3. device according to claim 2, it is characterised in that the inner chamber of the self-styled seat body (1) includes：From top to bottom The handstand round platform chamber and cylindrical cavity of connection；

The seal section (202) is in handstand round platform barrel structure, and external wall of upper portion and the inwall of the handstand round platform chamber offset.

4. device according to claim 3, it is characterised in that the inner chamber of the seal section (202) is in handstand frustum cone structure, Bottom is used to pass through with making the oil pipe (4) dynamic sealing.

5. device according to claim 2, it is characterised in that the lower end of the linkage section (201) and the self-styled seat sheet The upper end clamping of body (1).

6. device according to claim 5, it is characterised in that the lower surface of the linkage section (201) be provided with one with The coaxial annular locking member (2011) of the self-sealing rubber core (2)；

The upper surface of the self-styled seat body (1) is provided with an annular buckling groove coaxial with the self-styled seat body (1) (101)；

The annular locking member (2011) and annular buckling groove (101) clamping.

7. device according to claim 6, it is characterised in that the groove width of the annular buckling groove (101) from top to bottom by It is decrescence small；

The annular locking member (2011) is in the structure being adapted with the annular buckling groove (101).

8. device according to claim 2, it is characterised in that the lower end of the gland (3) is provided with stopper slot (301), Roof and side wall of the roof and side wall of the linkage section (201) respectively with the stopper slot (301) offset.

9. device according to claim 1, it is characterised in that the self-styled seat body (1) includes：Connect from top to bottom Upper linkage section (1a), interlude (1b), lower linkage section (1c)；

External diameter of the external diameter of the upper linkage section (1a) and the lower linkage section (1c) than the interlude (1b) is big；

It is connected between the upper linkage section (1a) and the gland (3) using multiple bolt assemblies；

It is connected between the lower linkage section (1c) and the stationary slip (5) using multiple bolt assemblies.