CN214303757U - Wellhead anti-overflow device - Google Patents

Abstract

The application discloses wellhead anti-overflow device belongs to the oil gas equipment field. The device includes coupling assembling and flexible chamber, and coupling assembling passes through the external screw thread to be connected with well head packing box, the one end and the flexible chamber intercommunication of the last through-hole of coupling assembling, and the other end and outside intercommunication, flexible chamber can follow its axis direction and stretch out and draw back, and because the space size in flexible chamber is variable, can be applicable to various operating modes. The problem of be difficult to deal with in the different operating modes among the correlation technique the interior fluid of pit and spill over is solved, the effect of the interior fluid of spilling over of pit and improvement well head anti-overflow efficiency in effectively collecting each operating mode has been reached.

Description

Wellhead anti-overflow device

Technical Field

The application relates to the field of oil and gas equipment, in particular to a wellhead anti-overflow device.

Background

In oil production, water is injected into the formation through a water injection well to increase the pressure of the formation, so as to improve the oil production efficiency. In order to master the working state of the water injection well, a test instrument is required to be used for regularly monitoring the pressure and flow parameters of each layer section of the water injection well. The wellhead is equipped with the packing box, has the opening on the packing box, and this opening part has the internal thread, and the steel wire penetrates the back from this through-hole and connects test instrument, then goes deep into and tests in the pit, however, the frequent friction of rubber packing in steel wire and the packing box can lead to rubber packing wearing and tearing to become invalid, and the high-pressure fluid in the well can spill over from the clearance between rubber packing and the steel wire, and the fluid that spills over not only can cause the corruption of well head accessory, still can be in the polluted environment after falling to the ground. Therefore, the problem of liquid overflow in the well during the testing process of the water injection well needs to be solved.

At present, in a well head anti-overflow device, including installing the accumulator on the packing box, this accumulator of fluid accessible that overflows is stored, and then discharges through the external pipeline on the accumulator.

However, during the test of the water injection well, because the underground pressure is different, the oil spills over the condition differently, and the collecting tank is difficult to deal with various spillover conditions, may cause anti-overflow efficiency lower and the effect is relatively poor.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a wellhead anti-overflow device. The technical scheme is as follows:

according to a first aspect of the present application, there is provided a wellhead overfill prevention device comprising a telescoping cavity and a connection assembly;

the external part of the connecting component is provided with an external thread which is matched with an internal thread of an opening of a wellhead packing box, the connecting component is internally provided with a through hole, the first end of the through hole is communicated with the inside of the telescopic cavity, and the second end of the through hole is communicated with the outside;

an instrument wire outlet hole is formed in the wall of the telescopic cavity and located on the side, opposite to the connecting assembly, of the cavity wall.

Optionally, the connecting assembly comprises a jackscrew and a disc-shaped sealing cover connected with one end of the jackscrew;

the through hole is positioned in the jackscrew and is arranged along the axis of the jackscrew, and the first end of the through hole is positioned on the disc-shaped sealing cover;

the disc-shaped sealing cover is connected with the telescopic cavity.

Optionally, the telescopic cavity comprises a cylindrical telescopic structure and a cover plate covering one end of the cylindrical telescopic structure, the disc-shaped sealing cover covers the other end of the cylindrical telescopic structure, and the cylindrical telescopic structure can be stretched in the axial direction of the cylindrical telescopic structure.

Optionally, the second end of the through hole of the jackscrew has a limit opening, and the size of the limit opening is smaller than the size of the opening of the first end of the through hole.

Optionally, the tube-shaped telescopic structure is further provided with a pressure relief hole, and the pressure relief hole is located on the side wall of the tube-shaped telescopic structure far away from one end of the connecting assembly.

Optionally, the instrument outlet hole is located in the center of the cover plate.

Optionally, the wellhead overfill prevention device further comprises a securing assembly coupled to the cover plate and configured to couple to the mounting portion.

Optionally, the material of the cylindrical telescopic structure comprises rubber or plastic.

Optionally, the jackscrew is of unitary construction with the disc-shaped sealing cover.

Optionally, lubricating oil is arranged in the through hole of the jackscrew.

The beneficial effects brought by the technical scheme provided by the embodiment of the application at least comprise:

the utility model provides a well head anti-overflow device, the device includes coupling assembling and flexible chamber, coupling assembling passes through the external screw thread and is connected with well head packing box, the one end and the flexible chamber intercommunication of the through-hole on the coupling assembling, the other end and outside intercommunication, flexible chamber can be followed its axis direction and is stretched out and drawn back, the fluid that overflows all can get into the elastic space in flexible chamber through coupling assembling's through-hole in the different work condition in the pit, and because the space size in flexible chamber is variable, can be applicable to various operating modes. The problem of be difficult to deal with in the different operating modes among the correlation technique the interior fluid of pit and spill over is solved, the effect of the interior fluid of spilling over of pit and improvement well head anti-overflow efficiency in effectively collecting each operating mode has been reached.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a block diagram of a wellhead overfill prevention device in accordance with an embodiment of the present application;

FIG. 2 is a block diagram of another wellhead overfill prevention device in accordance with embodiments of the present application;

FIG. 3 is a diagram illustrating an example of a usage state of the apparatus shown in FIG. 2;

fig. 4 is a diagram showing an example of a state in which the apparatus shown in fig. 2 is used.

With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

Fig. 1 is a block diagram of a wellhead overfill prevention device according to an embodiment of the present disclosure, and as shown in fig. 1, the wellhead overfill prevention device 1 includes a telescoping chamber 11 and a connection assembly 12.

The connection assembly 12 has external threads 121 on the exterior, the external threads 121 mating with internal threads of the wellhead packing box opening, and the connection assembly 12 has a through hole 122 therein, a first end 1221 of the through hole 122 communicating with the interior of the telescoping cavity 11, and a second end 1222 communicating with the exterior.

Packing box opening part has the internal thread, and coupling assembling 12 is connected with packing box screw thread through external screw thread 121, and structure like this for coupling assembling 12 fixes in the packing box, reduces the relative displacement between coupling assembling 12 and the packing box, improves this wellhead anti-overflow device's stability. Still have the through-hole 122 in coupling assembling 12, the first end 1221 and the flexible chamber 11 intercommunication of this through-hole 122 for in the fluid accessible coupling assembling 12 that overflows in the pit got into flexible chamber 11, this part fluid in the flexible intracavity was collected and was retrieved in making things convenient for the subsequent handling, in order to reduce the pollution to the well head.

The wall of the telescopic cavity 11 is provided with an instrument outlet hole 111, and the instrument outlet hole 111 is positioned on the opposite side of the wall of the cavity from the connecting component 12. As shown in FIG. 1, instrumentation outlet holes 111 located on the walls of telescoping lumen 11 are opposite connector assembly 12. When the pressure parameter in the pit is monitored through the testing instrument, the steel wire can penetrate through the instrument wire outlet hole 111, then penetrate out of the through hole of the connecting component 12, and then are connected with the testing instrument for testing.

To sum up, this application embodiment provides a well head anti-overflow device, and the device includes coupling assembling and flexible chamber, and coupling assembling passes through the external screw thread to be connected with well head packing box, the one end and the flexible chamber intercommunication of the through-hole on the coupling assembling, and the other end communicates with the outside, and flexible chamber can be followed its axis direction and is stretched out and drawn back, and because the space size in flexible chamber is variable, can be applicable to various operating modes. The problem of be difficult to deal with in the different operating modes among the correlation technique the interior fluid of pit and spill over is solved, the effect of the interior fluid of spilling over of pit and improvement well head anti-overflow efficiency in effectively collecting each operating mode has been reached.

Fig. 2 is a block diagram of another wellhead overfill prevention device according to the embodiments of the present application, with some adjustments made to the wellhead overfill prevention device 2 based on the device shown in fig. 1.

This wellhead anti-overflow device 2 includes: a telescoping lumen 21 and a connector assembly 22.

Packing box opening part has the internal thread, and coupling assembling 22 is connected with packing box screw thread through the external screw thread 221 that is located coupling assembling 22, and structure like this, coupling assembling 22 and packing box closely link to each other for the fluid that overflows in the well enters into through-hole 222 on coupling assembling 22, and stores in flexible chamber 21, collects and retrieves this part fluid to flexible intracavity in the subsequent handling of being convenient for, in order to reduce the pollution to the well head, improve anti-overflow efficiency.

Have instrument wire hole 211 on the chamber wall in flexible chamber 21, as shown in fig. 2, instrument wire hole 211 on the chamber wall that is located flexible chamber 21 is relative with coupling assembling 22, and the steel wire penetrates from instrument wire hole 211, then wears out from coupling assembling 22's through-hole, links to each other with test instrument again, so guarantees going on smoothly of pressure test in the pit, also can guarantee the anti-overflow effect of the well head anti-overflow device 2 that this application embodiment provided.

Optionally, the connection assembly 22 includes a jackscrew 223 and a disc-shaped sealing cover 224 connected to one end of the jackscrew 223, the through hole 222 is located in the jackscrew 223 and is arranged along the axis of the jackscrew 223, the first end 2221 of the through hole 222 is located on the disc-shaped sealing cover 224, and the disc-shaped sealing cover 224 is connected to the telescopic cavity 21. Illustratively, as shown in fig. 2, a through hole 222 is provided in the jackscrew 223, the axis of the through hole 222 coincides with the axis of the jackscrew 223, a first end 2221 of the through hole 222 is located on the disc-shaped sealing cover 224, and a second end 2222 of the through hole 222 is in communication with the outside. The external thread 221 is provided on the jackscrew 223, and the jackscrew 223 is connected with the packing box through the external thread 21. With the structure, the jackscrew 223 is fixed in the packing box through the external thread 221, so that oil overflowing in the well enters the jackscrew 223 through the through hole 222 of the jackscrew 223 and continues to move upwards into the telescopic cavity 21.

Wherein the inner diameter d1 of the disc-shaped sealing cover 224 is larger than the inner diameter d2 of the jackscrew 223, optionally, d1 is more than or equal to 2 × d 2. Since the nominal diameter of the internal thread at the upper opening of the packing box is small (the nominal diameter is also called as an average outer diameter, namely, the standardized diameter at the thread position), and the external thread 221 of the jackscrew 223 is matched with the internal thread at the opening of the packing box, the nominal diameter of the external thread 221 of the jackscrew 223 is also small, and similarly, the internal diameter of the through hole 222 is also small. Therefore, the internal diameter d1 that sets up sealed lid 224 of disc is greater than the internal diameter d2 of jackscrew 223 for the fluid that overflows in the well gets into through-hole 222, and then when flowing into flexible chamber 21, flexible chamber 21 can store more fluid, has reduced the ascending length of flexible chamber 21 in vertical direction simultaneously, so not only for subsequent process has left the construction allowance, has still guaranteed the anti-overflow efficiency of the well head anti-overflow device 2 that this application embodiment provided.

Alternatively, the telescopic chamber 21 includes a cylindrical telescopic structure 212 and a cover plate 213 covering one end of the cylindrical telescopic structure 212, a disc-shaped sealing cover 224 covering the other end of the cylindrical telescopic structure 212, and the cylindrical telescopic structure 212 can be expanded and contracted in the axial direction of the cylindrical telescopic structure 212. Illustratively, as shown in fig. 2, the cylindrical telescopic structure 212 is connected to the cover plate 213 at one end and to the disc-shaped sealing cover 224 at the other end. The oil overflowing from the well goes upward, enters the through hole 222 of the jackscrew 223, and is then stored in the tubular telescopic structure 212. This tube-shape extending structure 212 sets up to can stretch out and draw back along its axis direction, and such structure not only can save more fluid, has improved anti-overflow efficiency, and tube-shape extending structure 212 is when the shrink flattens moreover, and the ascending size of its axis direction is less. Fig. 3 is a view showing an example of a usage state of the apparatus shown in fig. 2, and as shown in fig. 3, when a pressure parameter in a well is measured by a measuring instrument, one end of a wire is connected to the measuring instrument, and the other end of the wire is configured to be connected to a mounting part D, wherein the mounting part D includes a pulley support base D1 and a fixed pulley D2 mounted on a pulley support base D1, and the wire is wound on the fixed pulley D2, and the measuring instrument is lifted and lowered by the rotation of the fixed pulley D2. The distance of well head and fixed pulley D2 is less, and the steel wire need pass flexible chamber 21 and coupling assembling 22 back and be connected with the test instrument moreover, and consequently, the height when tube-shape extending structure 212 is located the shrink state is less, can give away the space on this tube-shape extending structure 212 upper portion, reserves construction allowance for upper portion equipment, convenient operation.

Optionally, the second end 2222 of the through bore 222 of the jackscrew 223 has a limit opening 22221, the size of the limit opening 22221 being smaller than the size of the opening of the first end 2221 of the through bore 222. As shown in fig. 2, the limiting opening 22221 is located at the second end of the through hole 222, so that a steel wire for lifting and lowering the testing apparatus can penetrate through the limiting opening 22221, and meanwhile, oil spilled from the well can enter the through hole 222 from the limiting opening 22221 and then be stored in the telescopic cavity 21. Optionally, the diameter of the limiting opening 22221 may be twice the diameter of the steel wire selected in the actual working condition, so that the steel wire can smoothly penetrate through the limiting opening 22221, the friction with the limiting opening 22221 is reduced, and the service life of the steel wire and the jackscrew 223 is prolonged.

Optionally, the tubular telescopic structure 212 further has a pressure relief hole 2121, and the pressure relief hole 2121 is located on a side wall of the tubular telescopic structure 212 at an end far away from the connection assembly 22. As shown in fig. 2, when oil in the well is slightly leaked, the oil can be stored through the tubular telescopic structure 212, and as the oil overflowing from the well is continuously increased, the liquid level of the oil in the tubular telescopic structure 212 also gradually rises, and the oil can flow out from the pressure relief hole 2121. In the wellhead anti-overflow device 2 that this application embodiment provided, pressure release hole 2121 links to each other with the hose, and recovery unit is connected to the other end of hose for the liquid that overflows in the well is effectively retrieved.

Optionally, the instrument outlet hole 211 is located in the center of the cover plate 213. As shown in fig. 2, a steel wire can be inserted through the instrument outlet hole 211 in the center of the cover plate 213, and then through the cylindrical telescopic structure 212 and the connecting member 22, and then connected with a testing instrument for performing a downhole pressure test. Wherein, a chamfer is provided on the instrument outlet hole 211, and optionally, the chamfer is a C2 type chamfer (i.e., a chamfer with 2 mm chamfer angle). By the structure, the steel wire used for lifting and putting down the testing instrument to perform the underground test can be ensured to smoothly penetrate through the instrument wire outlet hole 211, meanwhile, the abrasion between the steel wire and the instrument wire outlet hole 211 can be reduced, and the service life of the wellhead anti-overflow device 2 provided by the embodiment of the application is prolonged.

Optionally, wellhead overfill prevention device 2 further includes a securing assembly 23, the securing assembly 23 coupled to cover plate 213 and configured to couple to mounting section D. As shown in fig. 3, the fixing assembly 23 includes a fixing ring 231 and a fixing rod 232. The fixing ring 231 is connected to the cover plate 213, and the fixing rod 232 is connected to the pulley support seat D1 of the mounting portion D. The inner diameter of the fixing ring 231 is slightly larger than the outer diameter of the fixing rod 232, and the fixing rod 232 can pass through the fixing ring 231, so that the telescopic cavity 21 connected with the fixing ring 231 keeps an upright state when liquid in the well enters the cylindrical telescopic structure 212, and overflow prevention and collection of the liquid are realized.

Optionally, the material of the tubular telescoping structure 212 comprises rubber or plastic. In an exemplary embodiment, the material of the tubular extension 212 in the wellhead overfill prevention device 2 is oil-resistant Rubber, such as Nitrile Butadiene Rubber (NBR), which has the advantages of high flexibility, good elasticity and high oil resistance, and can be used in high-temperature oil for a long time without corrosion. So can guarantee the elasticity and the elasticity of tube-shape extending structure 212 for tube-shape extending structure 212 has better ductility when testing the pressure parameter in the well through testing instrument, the fluid that overflows in as much as possible storage well when taking out testing instrument, take off tube-shape extending structure 212 behind the fixed subassembly 23 and can kick-back, tube-shape extending structure 212 is less in the ascending height of its axis direction after kick-backing, can give way the convenient operation of upper portion space.

Optionally, the jackscrew 223 is integral with the disk-shaped sealing cap 224. As shown in fig. 2, the jackscrew 223 and the disc-shaped sealing cover 224 can be integrally turned, so that the problem of poor sealing caused by a gap between the jackscrew 223 and the disc-shaped sealing cover 224 can be reduced.

Optionally, the through hole 222 of the jackscrew 223 is provided with lubricating oil therein. When liquid in the well overflows less, the liquid enters the through hole 222 from the limiting opening 22221, lubricating oil is arranged in the through hole 222, and the lubricating oil plays a role in blocking and buffering the overflowing liquid under the action of gravity. Meanwhile, the steel wire is connected with a testing instrument after passing through the through hole 222, lubricating oil can lubricate the steel wire, and rigid friction between the steel wire and the inner wall of the through hole 222 when the steel wire moves up and down in the through hole 222 can be reduced.

Fig. 4 is an example of the state of the device shown in fig. 2 after use, and as shown in fig. 3 and 4, the steel wire passes around the fixed pulley D1 of the mounting portion D, and then passes through the instrument outlet hole 211, the cylindrical telescopic structure 212, the through hole 222 and the limiting opening 22221 in sequence, and is connected with a testing instrument to perform a downhole pressure parameter test. Firstly, this wellhead anti-overflow device 2 is fixed in installation department D through fixed subassembly 23, it is rotatory along with fixed pulley D2, the steel wire drives the tester and descends, high-pressure liquid in the well may overflow from spacing opening 22221, and then get into in through-hole 222 and the tube-shape extending structure 212, tube-shape extending structure 212 can store this part of liquid, if the liquid spills over too much in the well, the liquid level in the tube-shape extending structure 212 continues to rise, liquid can flow out from the pressure release hole 2121 that is located on the lateral wall of tube-shape extending structure 212 one end of keeping away from coupling assembling 22, the external recovery plant of pressure release hole 2121, so can realize the anti-overflow and the recovery of liquid in the well. After the downhole pressure parameter test is finished, the connection between the fixing ring 231 and the fixing rod 232 in the fixing assembly 23 is released, and the cylindrical telescopic structure 212 is in a contraction state, so that an upper space can be made, and the operation is convenient.

To sum up, this application embodiment provides a well head anti-overflow device, the device includes coupling assembling and flexible chamber, coupling assembling passes through the external screw thread and is connected with well head packing box, the one end and the flexible chamber intercommunication of the through-hole on the coupling assembling, the other end and outside intercommunication, flexible chamber can follow its axis direction and stretch out and draw back, and because the space size in flexible chamber is variable, can be applicable to various operating modes, the fluid accessible coupling assembling's that overflows in the well through-hole gets into in the elastic space in flexible chamber, and then flows through the pressure release hole that is located on the flexible chamber wall. The problem of be difficult to deal with in the different operating modes among the correlation technique the interior fluid of pit and spill over is solved, the effect of the interior fluid of spilling over of pit and improvement well head anti-overflow efficiency in effectively collecting each operating mode has been reached.

In this application, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" means two or more unless expressly limited otherwise.

The present application is intended to cover various modifications, alternatives, and equivalents, which may be included within the spirit and scope of the present application.

Claims (10)

1. A wellhead anti-overflow device is characterized by comprising a telescopic cavity and a connecting assembly;

the external part of the connecting component is provided with an external thread which is matched with an internal thread of an opening of a wellhead packing box, the connecting component is internally provided with a through hole, the first end of the through hole is communicated with the inside of the telescopic cavity, and the second end of the through hole is communicated with the outside;

an instrument wire outlet hole is formed in the wall of the telescopic cavity and located on the side, opposite to the connecting assembly, of the cavity wall.

2. The wellhead overfill prevention device of claim 1, wherein said connection assembly comprises a jackscrew and a disc-shaped seal cap connected to one end of said jackscrew;

the through hole is positioned in the jackscrew and is arranged along the axis of the jackscrew, and the first end of the through hole is positioned on the disc-shaped sealing cover;

the disc-shaped sealing cover is connected with the telescopic cavity.

3. The wellhead overfill prevention device of claim 2, wherein said telescoping chamber comprises a cylindrical telescoping structure and a cover plate covering one end of said cylindrical telescoping structure, said disc-shaped sealing cover covering the other end of said cylindrical telescoping structure, said cylindrical telescoping structure being capable of telescoping in the axial direction of said cylindrical telescoping structure.

4. The wellhead overfill prevention device of claim 2, wherein said jackscrew throughbore second end has a limit opening, said limit opening being smaller in size than the opening of said throughbore first end.

5. The wellhead spill prevention device according to claim 3, wherein the tubular telescoping structure further comprises a pressure relief hole, and the pressure relief hole is located on a side wall of the tubular telescoping structure at an end far away from the connection assembly.

6. The wellhead overfill prevention device of claim 3, wherein said instrumentation outlet hole is located in the center of said cover plate.

7. The wellhead overfill prevention device of claim 3, further comprising a securing assembly connected to said cover plate and configured to connect to a mounting portion.

8. The wellhead overfill prevention device of claim 3, wherein said tubular telescoping structure material comprises rubber or plastic.

9. The wellhead overfill prevention device of claim 2, wherein said jackscrew is of unitary construction with said disc-shaped seal cover.

10. The wellhead overfill prevention device of any of claims 2-9, wherein said jackscrew throughbore is provided with lubricating oil.

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