CN216277752U - Well killing type well washing structure - Google Patents

Abstract

The utility model discloses a kill-job type well flushing structure, which comprises a hollow pipe body, wherein a packing structure is arranged on the circumferential outer side of the pipe body, a check valve structure is arranged in the pipe body, the check valve structure comprises a flow blocking ball, the flow blocking ball is movably supported in the pipe body through a pressure damage type supporting structure, when the actual fluid flow direction in the pipe body is opposite to the fluid flow direction allowed by the check valve structure, and the fluid pressure exceeds the maximum supporting force of the pressure damage type supporting structure, the pressure damage type supporting structure is damaged, the check valve structure fails, and the pipe body can enable fluid to flow in two directions along the axial direction of the pipe body. The scheme above adopting can satisfy normal oil recovery demand, has good closing cap effect simultaneously at well-flushing in-process, prevents effectively that well-flushing liquid from soaking the stratum, causes the destruction to the oil reservoir, improves well-flushing efficiency, reduces well-flushing cost, and in addition, the quick kill job of being convenient for shortens kill reaction time, gets rid of the potential safety hazard, has good reliability.

Description

Well killing type well washing structure

Technical Field

The utility model belongs to the field of petroleum equipment, and particularly relates to a well killing type well washing structure.

Background

In the process of oil well exploitation, substances such as wax scale in oil can be separated out due to changes of pressure, temperature and the like and further attached to the wall of an oil pipe and a sucker rod, the service lives of the oil pipe and the sucker rod can be shortened in the past, and even production safety accidents are caused.

Therefore, some devices specially used for well washing are proposed in the prior art, such as a patent with the publication number of "CN 2620080Y" and the patent name of "hot well washing packer", namely the device can be used for a hot well washing process, and mainly comprises an upper packer structure and a lower check valve structure, however, the applicant finds that in the field practical application process, when the structure is adopted, the bottom-hole fluid can only flow upwards, and in the well closing and washing or well repairing process, when the bottom-hole pressure is abnormal and needs well killing, the tool becomes a well killing block, the well killing fluid can not reach the bottom hole to directly balance the bottom-hole pressure, the time consumed for temporarily taking out the oil pumping drilling tool assembly is long, the optimal well killing opportunity is missed, the construction risk is increased, and the potential safety hazard is large.

SUMMERY OF THE UTILITY MODEL

In view of the above, the utility model provides a kill-type well-flushing structure, which is used for solving the problems of high potential safety hazard, poor reliability and the like of a well-flushing leakage-proof structure in the prior art.

The technical scheme is as follows:

the utility model provides a but kill-job formula well-flushing structure, is including the body that is hollow structure, body circumference outside is equipped with seals the partition structure, is equipped with the check valve structure in the body, the check valve structure includes the choked flow ball, and its key lies in: the flow blocking ball is movably supported in the pipe body through the pressure damage type supporting structure, when the actual fluid flow direction in the pipe body is opposite to the fluid flow direction allowed by the check valve structure, and the fluid pressure exceeds the maximum supporting force of the pressure damage type supporting structure, the pressure damage type supporting structure is damaged, the check valve structure fails, and the pipe body can allow fluid to flow in the axial direction in a two-way mode.

By adopting the scheme, the oil well pump is connected to the lower part of the oil well pump when the oil well pump is in a well, the oil sleeve annulus is sealed by the sealing structure, the check valve structure ensures that fluid can flow upwards under the action of the oil well pump, meanwhile, the oil sleeve annulus on the upper part of the sealing structure can be in a local negative pressure state, namely, the back pressure of an oil sleeve annulus liquid column to an oil layer is reduced, a certain negative pressure oil extraction effect is achieved, in the well flushing process, the sealing structure and the check valve structure can effectively prevent the fluid from invading into a stratum below a short section, the oil layer or the stratum is prevented from being polluted, the using amount of well flushing liquid is reduced, the well flushing efficiency is improved, the well flushing cost is reduced, in the well repairing process, the bottom hole pressure is abnormal, when well killing operation is required, the pressure damage type supporting structure can be damaged by a fluid pressurizing mode, the paper check valve structure fails, at the time, the ground well flushing liquid can directly reach the bottom hole, the normal operation of the well killing operation is ensured without taking out and replacing the oil production pipe.

Preferably, the method comprises the following steps: the pressure failure type supporting structure comprises a ball seat and a shearing pin, the ball seat is matched with the flow resisting ball, and the ball seat is connected with the pipe body through the shearing pin. The ball seat and the shear pin matched structure is adopted to support the flow resisting ball, the structure is convenient to process and install, the implementation cost is relatively low, and the reliability is good.

Preferably, the method comprises the following steps: the shearing pin is along ball seat circumference evenly distributed, just the shearing pin radially sets up along the body. By adopting the scheme, the ball seat can be ensured to bear uniform force, the phenomenon that certain shearing pins are not sheared due to uneven force is avoided, and the ball seat is inclined to leak liquid.

Preferably, the method comprises the following steps: and a sealing ring A is arranged between the ball seat and the pipe body. Scheme more than adopting because has the clearance between ball seat and the body, and can seal the clearance between the two through sealing washer A, improves the leak protection reliability.

Preferably, the method comprises the following steps: and the sealing ring A is positioned above the shearing pin. By adopting the scheme, the phenomenon that the flushing fluid invades into a gap between the pipe body and the ball seat during conventional well flushing to cause physical or/and chemical abrasion to the shearing pin can be avoided.

Preferably, the method comprises the following steps: the bottom of the pipe body is provided with an anti-falling structure. By adopting the scheme, the support structure and the choked flow ball which are damaged can be received through the anti-falling structure, the support structure and the choked flow ball cannot fall off to the bottom of the well completely, the later fishing procedure can be avoided, and the formation of a two-way channel of the pipe body cannot be hindered.

Preferably, the method comprises the following steps: the pipe body comprises an upper pipe body and a lower pipe body which are connected in a threaded manner, the ball seat is located on the lower pipe body, and a sealing ring B is arranged between the upper pipe body and the lower pipe body. By adopting the scheme, the sealing structure and the check valve structure can be conveniently disassembled and assembled, and the overall sealing reliability is ensured.

Preferably, the method comprises the following steps: the packing structure comprises at least one packing cup, and the packing cup is located above the check valve structure. By adopting the scheme, the height difference is beneficial to improving the packing effect.

Preferably, the method comprises the following steps: the upper part of the pipe body is provided with a screen section, and screen holes distributed along the axial direction of the screen section are arranged on the screen section. By adopting the scheme, the liquid level in the well can be conveniently tested on the ground, and the testing efficiency is improved.

Compared with the prior art, the utility model has the beneficial effects that:

the well killing type well washing structure provided by the utility model can meet the normal exploitation requirement, has a good capping effect in the well washing process, effectively prevents well washing liquid from immersing the stratum to damage an oil layer, improves the well washing efficiency, reduces the well washing cost, facilitates the rapid well killing operation, shortens the well killing reaction time, eliminates potential safety hazards, and has good reliability.

Drawings

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is a partially enlarged view of fig. 1.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Refer to the kill-job well washing structure that fig. 1 and fig. 2 show, it mainly includes the body that is hollow structure, body circumference outside is equipped with seals the partition structure, be equipped with the check valve structure in the body, the check valve structure includes choked flow ball 7, choked flow ball 7 passes through pressure destruction formula bearing structure movable support in the body, pressure destruction formula bearing structure suffers destruction easily under the pressure effect, specifically speaking, the actual fluid flow direction in the body is opposite with the check valve structure permission fluid flow direction, and when fluid pressure exceeded pressure destruction formula bearing structure's maximum bearing force, pressure destruction formula bearing structure is destroyed, the check valve structure became invalid, the body can supply fluid along its axial bidirectional flow, can carry out normal kill-job this moment.

As shown in the figures, in order to reduce the processing cost and facilitate the assembly, the pipe body is designed to be a split type, which includes an upper pipe body 4 and a lower pipe body 9 (the upper and lower directions in this embodiment are referred to the position in the oil well, the upper direction is closer to the well head, and the lower direction is closer to the well bottom), the pressure-destructive support structure is mainly composed of a ball seat 8 and a shear pin 11, the ball seat 8 is located on the lower pipe body 9, and is a columnar structure with two open ends, the outer diameter of the columnar structure is adapted to the inner diameter of the lower pipe body 9, the two are in clearance fit or transition fit, the ball seat 8 is connected with the lower pipe body 9 through the shear pin 11, when the choke ball 7 is located on the ball seat 8, the downward passage of the fluid in the pipe body is cut off, when the upper oil pump pumps to lift the choke ball 7 to separate from the ball seat 8, the upward passage of the fluid in the pipe body is smooth, and certainly the same as that of most check valves, a stop structure is correspondingly arranged in the pipe body close to the upper part to prevent the flow blocking ball 7 from moving upwards beyond the allowable position along with the fluid.

Of course, pressure destruction formula bearing structure is except above-mentioned structure, also can adopt the resistance structure, if support ball seat 8 through the elastic component in the body, and set up the weeping hole on the lateral wall of body, under the normal production condition, the weeping hole is located ball seat 8's below, only when ground pump income fluid surpassed certain pressure, ball seat 8 just can descend to the below in weeping hole, make inside and the outside intercommunication of body lower extreme in body upper end, can carry out normal killing operation promptly, similar structure all is within the protection scope of this application.

In this embodiment, the ball seat 8 and the lower pipe body 9 are coaxially arranged, the number of the shear pins 11 is at least two, the shear pins are uniformly distributed along the circumferential direction of the ball seat 8 and radially arranged along the lower pipe body 9, and the number of the shear pins 11 is mainly determined according to the related pressure parameters of the production well.

As shown, in order to prevent the flushing fluid from leaking into the lower ground layer from the gap between the ball seat 8 and the lower tubular body 9, a sealing ring a10 is disposed between the ball seat 8 and the tubular body, and a sealing ring a10 is disposed above the shear pin 11, and a plurality of sealing rings a10 can be sleeved as required, and similarly, a sealing ring B12 is disposed between the upper tubular body 4 and the lower tubular body 9, and the sealing ring B12 is close to the lower end of the upper tubular body 4.

To the pressure destruction formula bearing structure that shear pin 11 and ball seat 8 constitute, in case need carry out the kill job, then need destroy pressure destruction formula bearing structure, shear pin 11 is cut promptly, ball seat 8 and choked flow ball 7 together fall into the shaft bottom, later stage salvage process has been increased, for this reason, during the implementation, set up anti-disengaging structure (not shown in the figure) in pipe body bottom is supporting, anti-disengaging structure is the basket usually, the net frame molding promptly, can prevent enough that ball seat 8 and choked flow ball 7 from dropping, do not cause the jam to passageway about the fluid again.

The packing structure adopts and traditional packer similar structure in this application, including at least one packing cup 5, as shown in the figure, packing cup 5 is installed on upper tube body 4 through the packing cup seat 6 that corresponds the setting, and packing cup seat 6 offsets with the up end of lower tube body 9, and the upper portion of upper tube body 4 is equipped with baffle 3.

To further improve the utilization of the present application, a screen 1 is attached to the upper end of the upper tubular body 4, as shown, the screen 1 is typically connected to the upper tubular body 4 by means of a joint 2, while the screen 1 has screen holes evenly distributed along its axial direction, and the lower end of the lower tubular body 9 has external threads for connection to a lower tool.

Referring to the kill-job type well-flushing structure shown in fig. 1 and fig. 2, when putting into the production string, can link to each other this nipple joint lug connection to the oil-well pump below, with oil pipe or sand-settling pipe, in the normal production process, produce through the oil-well pump suction and make fluid pass through the single current valve structure and get into the upper portion tubular column in, because the packing effect of leather cup 5 simultaneously, can make upper portion keep certain negative pressure environment to play the effect of negative pressure oil recovery.

In the well washing process, the well washing liquid gets into from the upper portion annular space, get into in the oil pipe through screen pipe 1 again, carry out the circulation of well washing liquid, because the separation of fluid downward passage leather cup 5 and choked flow ball 7, and can not invade the stratum of lower part, more can not cause the damage to the stratum, can also reduce the well washing liquid quantity simultaneously, improve well washing efficiency, reduce well washing cost etc., when closing the well workover in-process, when the condition that needs the kill-job appears, then the mode that accessible well head suppressed, destroy formula bearing structure to destroying, cut shear pin 11 promptly, thereby make the kill-job liquid can normally circulate to the shaft bottom, satisfy the kill-job demand.

Finally, it should be noted that the above-mentioned description is only a preferred embodiment of the present invention, and those skilled in the art can make various similar representations without departing from the spirit and scope of the present invention.

Claims (9)

1. The utility model provides a but kill-job formula well-flushing structure, is including the body that is hollow structure, body circumference outside is equipped with seals the partition structure, is equipped with the check valve structure in the body, the check valve structure includes choked flow ball (7), its characterized in that: the flow blocking ball (7) is movably supported in the pipe body through the pressure damage type supporting structure, when the actual fluid flow direction in the pipe body is opposite to the fluid flow direction allowed by the check valve structure, and the fluid pressure exceeds the maximum supporting force of the pressure damage type supporting structure, the pressure damage type supporting structure is damaged, the check valve structure fails, and the pipe body can supply fluid to flow in the axial direction in two directions.

2. The kill-able well-flushing structure of claim 1, wherein: the pressure failure type supporting structure comprises a ball seat (8) and a shearing pin (11), wherein the ball seat (8) is adapted to the flow resisting ball (7), and the ball seat (8) is connected with the pipe body through the shearing pin (11).

3. The kill-able well-flushing structure of claim 2, wherein: shear pin (11) are along ball seat (8) circumference evenly distributed, just shear pin (11) radially set up along the body.

4. The kill-type well-flushing structure of claim 2 or 3, wherein: and a sealing ring A (10) is arranged between the ball seat (8) and the pipe body.

5. The kill-able well-flushing structure of claim 4, wherein: the sealing ring A (10) is located above the shearing pin (11).

6. The kill-able well-flushing structure of any one of claims 1 to 3, wherein: the bottom of the pipe body is provided with an anti-falling structure.

7. The kill-type well-flushing structure of claim 2 or 3, wherein: the pipe body includes threaded connection's last body (4) and body (9) down, ball seat (8) are located body (9) down, and are equipped with between last body (4) and body (9) down and seal washer B (12).

8. The kill-able well-flushing structure of any one of claims 1 to 3, wherein: the packing structure comprises at least one packing cup (5), and the packing cup (5) is located above the check valve structure.

9. The kill-able well-flushing structure of any one of claims 1 to 3, wherein: the upper part of the pipe body is provided with a screen pipe section (1), and screen holes distributed along the axial direction of the screen pipe section (1) are arranged on the screen pipe section.

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