CN222228496U

CN222228496U - Sand washer for drilling and repairing well

Info

Publication number: CN222228496U
Application number: CN202421046867.6U
Authority: CN
Inventors: 郝鹏鹏
Original assignee: Daqing Zhongpeng Energy Technology Co ltd
Current assignee: Daqing Zhongpeng Energy Technology Co ltd
Priority date: 2024-05-15
Filing date: 2024-05-15
Publication date: 2024-12-24
Anticipated expiration: 2034-05-15

Abstract

A sand flushing device for drilling and repairing wells relates to the technical field of downhole drilling tools. The inner hole of the sand flushing pipe is connected with a piston through a sealing ring gap, the lower part of the sand flushing pipe is connected with a retaining ring through a thread, a step cap is processed on the lower part of the piston, the step cap is connected with the inner hole gap of the retaining ring, the step cap extends out of the retaining ring, a compression spring is arranged between the step of the step cap and the retaining ring, the piston is provided with an annular groove on the lower side of the sealing ring, the countersunk hole of the piston and the annular groove are connected through a side hole, a small sand flushing hole is provided at the bottom of the countersunk hole, and a large sand flushing hole is provided on the wall of the sand flushing pipe. The beneficial effect of the utility model is that the sand is flushed at the same time by setting a large sand flushing hole and a small sand flushing hole at normal pressure, and a large flow of flushing fluid is used to carry the sand back to the wellhead. When the mud and sand are hardened, the high-pressure and high-speed flushing fluid of the small sand flushing hole is used to impact the hardened sand by increasing the pressure, and the sand in the well can be flushed out by repeated circulation. The sand flushing operation can be completed by changing the pump pressure and flow rate without repeatedly inserting different pipe columns.

Description

Sand washer for drilling and repairing well

Technical Field

The utility model relates to the technical field of downhole tools for drilling, in particular to a sand washer for drilling and repairing.

Background

In the drilling process, sand is seriously discharged from a vertical well section, an inclined well section and a horizontal well section, a self-reverse drainage system cannot be established at the bottom of a well to discharge abrasive belts, so that tools are blocked in the well descending process in the drilling and well repairing process, the conventional sand removing mode comprises hydraulic sand washing and mechanical sand bailing, the hydraulic sand washing is most commonly used, in the hydraulic sand washing process, when the sand hardening strength is high, a sand washing pipe with a high-pressure punch is frequently placed in the well to wash sand when the sand is difficult to wash sand, a lower well tubular column is lifted out after sand washing reaches a preset position, the sand washing pipe is placed again after the high-pressure punch is detached, and the sand washing mode is carried by large flow to return sand into the well.

Disclosure of utility model

The utility model provides a drilling and workover sand washer, aiming at solving the problems that different tubular columns need to be put in for many times, the operation is complicated and the construction efficiency is low when drilling and workover sand is washed.

The technical scheme includes that the drilling and repairing sand washer comprises a sand washing pipe, an upper joint is processed at the upper part of the sand washing pipe, a piston is connected to an inner hole of the sand washing pipe through clearance fit of a sealing ring, the lower part of the sand washing pipe is connected with a baffle ring through threads, a step cap is processed at the lower part of the piston, the step cap is connected with the inner hole of the baffle ring through clearance fit, the step cap stretches out of the baffle ring, a compression spring is arranged between the step of the step cap and the baffle ring, the upper part of the inner hole of the sand washing pipe is processed into a step hole, the upper part of the piston is propped against the step of the step hole, a ring groove is formed at the lower side of the sealing ring, a counter bore is formed at the top of the piston, the counter bore is communicated with the ring groove through a side hole, a small sand washing hole is formed at the bottom of the counter bore, a large sand washing hole is formed in the pipe wall of the sand washing pipe, and the position of the inner hole of the sand washing pipe corresponds to the ring groove.

The large sand flushing holes are uniformly distributed along the circumference of the sand flushing pipe, the small sand flushing holes are uniformly distributed along the circumference of the step cap, the total sectional area of the large sand flushing holes is 8-10 times of the sectional area of the small sand flushing Kong Geji, the small sand flushing holes are obliquely opened on the step cap towards the outer diameter direction, and the large sand flushing holes are opened in the pipe wall of the sand flushing pipe towards the obliquely lower direction.

After the piston descends to a certain distance, the ring groove and the large sand washing hole can be staggered.

The sand washing device has the beneficial effects that sand is washed out simultaneously by arranging the normal-pressure large sand washing hole and the small sand washing hole, sand is carried by using the large-flow washing liquid to return to the wellhead, when the sand is hardened by the mud, the hardening intensity is high, the high-pressure high-speed washing liquid of the small sand washing hole is used for pressurizing to impact the hardened sand, the sand in the pit can be washed out by repeated circulation, and the sand washing operation can be completed without entering different tubular columns for many times only by changing the pump pressure and the flow.

Drawings

Fig. 1 is a schematic diagram of the structure of the present utility model.

In the figure, the sand washing pipe is 1-, the upper joint is 2-, the piston is 3-, the baffle ring is 4-, the annular groove is 5-, the side hole is 6-, the sand washing hole is 7-big, the step cap is 8-, the sand washing hole is 9-small, the counter bore is 10-, the step hole is 11-and the inner hole is 12-.

Detailed Description

As shown in fig. 1, the drilling and workover sand washer comprises a sand washing pipe 1, an upper joint 2 is processed at the upper part of the sand washing pipe 1, a piston 3 is connected with an inner hole 12 of the sand washing pipe 1 through a sealing ring clearance fit, a baffle ring 4 is connected to the lower part of the sand washing pipe 1 through threads, a step cap 8 is processed at the lower part of the piston 3, the step cap 8 is connected with the inner hole 12 of the baffle ring 4 through a clearance fit, the step cap 8 extends out of the baffle ring 5, a compression spring is arranged between the step of the step cap 8 and the baffle ring 4, a step hole 11 is processed at the upper part of the inner hole 12 of the sand washing pipe 1, the upper part of the piston 3 is propped against the step of the step hole 11, a ring groove 5 is formed at the lower side of the sealing ring of the piston 3, a counter bore 10 is formed at the top of the piston 3, the counter bore 10 is communicated with the ring groove 5 through a side hole 6, a small sand washing hole 9 is formed at the bottom of the counter bore 10, the small sand washing hole 9 is communicated with the outside at the step cap 8, a large sand washing hole 7 is formed in the pipe wall of the sand washing pipe 1, and the position of the inner hole 12 of the sand washing pipe 1 corresponds to the ring groove 5.

The large sand washing holes 7 are uniformly distributed along the circumference of the sand washing pipe 1, the small sand washing holes 9 are uniformly distributed along the circumference of the step cap 8, the total sectional area of the large sand washing holes 7 is 8-10 times of the total sectional area of the small sand washing holes 9, the small sand washing holes 9 are obliquely opened on the step cap 8 towards the outer diameter direction, and the large sand washing holes 7 are opened in the pipe wall of the sand washing pipe 1 towards the obliquely lower direction.

When the piston 3 descends to a certain distance, the annular groove 5 and the large sand flushing hole 7 can be staggered, when sand flushing is carried out, the sand flushing pipe 1 and the drilling tool are connected through the upper joint 2, the pipe is put into the well, flushing fluid is introduced into the pipe column, most flushing fluid flows out through the large sand flushing hole 7, the large flow of flushing fluid carries sand to return to the well head, when the hardening strength of the silt is high, the injection pressure of the flushing fluid is improved, the piston 3 descends under high pressure, the large sand flushing hole 7 is staggered with the annular groove 5, the flushing fluid can only be sprayed out from the small sand flushing hole 9, the high pressure flushing fluid sprays out to impact silt to loosen the silt, then the injection pressure is recovered to be normal, the large sand flushing hole 7 is communicated with the annular groove 5, and the loose sand is brought out of the well head by the large flow of flushing fluid.

Through setting up the big sand washing hole of ordinary pressure 7 and the sand washing hole of little 9 simultaneously, utilize the washing liquid of large-traffic to carry sand and return the well head, when meetting mud sand hardening intensity big, the high-pressure high-speed washing liquid of the little sand washing hole 9 of use of stepping up strikes the sand of hardening, and the sand in pit can be washed out by the circulation repeatedly, only needs to change pumping pressure and flow, need not to go into different tubular columns many times and can accomplish the sand washing operation.

Claims

1. A drilling and workover sand washer comprises a sand washing pipe (1), and is characterized in that an upper joint (2) is processed at the upper part of the sand washing pipe (1), an inner hole (12) of the sand washing pipe (1) is connected with a piston (3) through a sealing ring in a clearance fit manner, the lower part of the sand washing pipe (1) is connected with a baffle ring (4) through threads, a step cap (8) is processed at the lower part of the piston (3), the step cap (8) is connected with the inner hole (12) of the baffle ring (4) in a clearance fit manner, the step cap (8) extends out of the baffle ring (4), a compression spring is arranged between the step of the step cap (8) and the baffle ring (4), a step hole (11) is processed at the upper part of the inner hole (12) of the sand washing pipe (1), the upper part of the piston (3) is propped against the step of the step hole (11), a ring groove (5) is formed at the lower side of the sealing ring, a small hole (9) is formed at the top of the piston (3), the counter bore (10) is communicated with the ring groove (5) through a side hole (6), a small hole (9) is formed at the bottom of the step cap (10), a small hole (9) is formed at the bottom of the baffle ring (8) and is communicated with the sand washing pipe (7), the position of the large sand washing hole (7) in the inner hole (12) of the sand washing pipe (1) corresponds to the ring groove (5).

2. The well drilling and repairing sand washer according to claim 1 is characterized in that large sand washing holes (7) are uniformly distributed along the circumference of the sand washing pipe (1), small sand washing holes (9) are uniformly distributed along the circumference of the step cap (8), the total sectional area of the large sand washing holes (7) is 8-10 times of the total sectional area of the small sand washing holes (9), the small sand washing holes (9) are obliquely opened on the step cap (8) towards the outer diameter direction, and the large sand washing holes (7) are opened in the pipe wall of the sand washing pipe (1) towards the obliquely lower direction.

3. The workover rig according to claim 1, wherein the ring groove (5) and the large flushing hole (7) are offset from each other after the piston (3) has been lowered a certain distance.