Well drilling and workover sand washing device
By setting up a coordinated structure of large sand punching holes and small sand punching holes in the drilling and repairing sand punching device, using normal pressure and high flow rate and high pressure flushing liquid, the problem of low sand flushing efficiency during drilling is solved, and the construction efficiency is improved And reduces operational complexity and cost.
Patent Information
- Application Number
- CN202421046867.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-15
- Publication Date
- 2024-12-24
- Estimated Expiration
- 2034-05-15
AI Technical Summary
During the drilling process, sand is severely produced in straight well sections, inclined well sections, and horizontal well sections. The existing hydraulic sand flushing method is cumbersome and the construction efficiency is low. Especially when the mud sand plate is strong, it is difficult to effectively rush out the sand, resulting in tool drilling. block.
A drilling and repairing sand-pulling device is designed, which adopts large sand-pulling holes and small sand-pulling holes in the sand-pulling pipe. Through the matching structure of the piston and the step cap, the sand is carried back to the wellhead by using the normal pressure and high flow rate flushing liquid, and the When the mud and sand plate is solidified, use high-pressure small sand punching holes to impact the sand, and repeatedly circulate the sand to avoid the need to replace the pipe column multiple times.
It realizes efficiently rushing out of the sand from the hole without multiple downs of different pipe columns, improving construction efficiency and reducing operational complexity and operating costs.
Smart Images
Figure CN222228496U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of downhole drilling tools, in particular to a sand flushing device for drilling and repairing wells. Background Art
[0002] During the drilling process, there is serious sand production in the vertical well section, the inclined well section, and the horizontal well section. Due to the excessive amount of sand, a self-return drainage system cannot be established at the bottom of the well to bring out the sand, resulting in the tool being stuck in the well during the drilling and well repair process. The commonly used sand removal methods are hydraulic sand flushing and mechanical sand bailing, among which hydraulic sand flushing is the most commonly used. In the hydraulic sand flushing process, when the mud and sand are hard to be flushed out by the normal sand flushing pipe, a sand flushing pipe with a high-pressure punch is often lowered into the well for sand flushing. When the sand is flushed to the predetermined position, the downhole pipe column is pulled out, and the high-pressure punch is removed and the sand flushing pipe is lowered again to use a large flow rate to carry the mud and sand back into the well. This sand flushing method requires the sand flushing pipe to be pulled out and the high-pressure punch is removed, and then the sand flushing pipe is lowered again, which has the disadvantages of cumbersome operation, low construction efficiency, and high operating cost. Utility Model Content
[0003] In order to solve the problems that different pipes need to be lowered multiple times during sand flushing during drilling and repairing wells, the operation is complicated and the construction efficiency is low, the utility model provides a sand flushing device for drilling and repairing wells.
[0004] The technical scheme provided by the utility model is as follows: a well drilling and repairing sand flushing device comprises a sand flushing pipe, an upper joint is processed on the upper part of the sand flushing pipe, 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 upper part of the inner hole of the sand flushing pipe is processed into a step hole, the upper part of the piston is pressed on the step of the step hole, the piston is provided with an annular groove on the lower side of the sealing ring, a countersunk hole is formed on the top of the piston, the countersunk hole and the annular groove are communicated through a side hole, a small sand flushing hole is formed at the bottom of the countersunk hole, the small sand flushing hole is communicated with the outside at the step cap position, a large sand flushing hole is formed on the pipe wall of the sand flushing pipe, and the position of the large sand flushing hole in the inner hole of the sand flushing pipe corresponds to the annular groove.
[0005] The large sand-blasting holes are evenly arranged along the circumference of the sand-blasting tube, and the small sand-blasting holes are evenly arranged along the circumference of the step cap. The total cross-sectional area of the large sand-blasting holes is 8 to 10 times the total cross-sectional area of the small sand-blasting holes. The small sand-blasting holes are opened on the step cap in an inclined direction toward the outer diameter, and the large sand-blasting holes are opened in the wall of the sand-blasting tube toward an oblique downward direction.
[0006] When the piston descends to a certain distance, the ring groove and the large sand-blasting hole can be staggered with each other.
[0007] The beneficial effects of the utility model are as follows: by setting a large sand flushing hole and a small sand flushing hole at normal pressure to flush sand at the same time, a large flow of flushing fluid is used to carry sand back to the wellhead; when the mud and sand are compacted with great strength, the pressure is increased and the high-pressure and high-speed flushing fluid of the small sand flushing hole is used to impact the compacted sand; the sand in the well can be flushed out through repeated circulation; the sand flushing operation can be completed by only changing the pump pressure and flow rate, without the need to run different pipes multiple times. BRIEF DESCRIPTION OF THE DRAWINGS
[0008] Attached Figure 1 It is a structural schematic diagram of the utility model.
[0009] In the figure, 1-sand flushing pipe, 2-upper joint, 3-piston, 4-retaining ring, 5-ring groove, 6-side hole, 7-large sand flushing hole, 8-step cap, 9-small sand flushing hole, 10-countersunk hole, 11-step hole, 12-inner hole. DETAILED DESCRIPTION
[0010] like Figure 1 As shown, the well drilling and repairing sand flushing device comprises a sand flushing pipe 1, the upper part of the sand flushing pipe 1 is processed with an upper joint 2, the inner hole 12 of the sand flushing pipe 1 is connected with a piston 3 through a sealing ring gap, the lower part of the sand flushing pipe 1 is connected with a retaining ring 4 through a thread, the lower part of the piston 3 is processed with a step cap 8, the step cap 8 is connected with the inner hole 12 of the retaining ring 4 through a gap, the step cap 8 extends out of the retaining ring 5, and a compression spring is arranged between the step of the step cap 8 and the retaining ring 4, the upper part of the inner hole 12 of the sand flushing pipe 1 is processed into a step hole 11, the upper part of the piston 3 is supported on the step of the step hole 11, the piston 3 is provided with an annular groove 5 on the lower side of the sealing ring, the top of the piston 3 is provided with a counterbore 10, the counterbore 10 and the annular groove 5 are connected through a side hole 6, a small sand flushing hole 9 is provided at the bottom of the counterbore 10, and the small sand flushing hole 9 is connected with the outside at the step cap 8 position, and a large sand flushing hole 7 is provided on the pipe wall of the sand flushing pipe 1, and the large sand flushing hole 7 corresponds to the annular groove 5 at the position of the inner hole 12 of the sand flushing pipe 1.
[0011] The large sand flushing holes 7 are evenly arranged along the circumference of the sand flushing tube 1, and the small sand flushing holes 9 are evenly arranged along the circumference of the step cap 8. The total cross-sectional area of the large sand flushing holes 7 is 8 to 10 times the total cross-sectional area of the small sand flushing holes 9. The small sand flushing holes 9 are obliquely opened on the step cap 8 toward the outer diameter direction, and the large sand flushing holes 7 are opened in the tube wall of the sand flushing tube 1 toward oblique downward.
[0012] When the piston 3 descends to a certain distance, the annular groove 5 and the large sand flushing hole 7 can be staggered with each other. When sand flushing is performed, the sand flushing pipe 1 is connected to the drill bit through the upper joint 2 and lowered into the well. Flushing fluid is introduced into the pipe string. Most of the flushing fluid flows out through the large sand flushing hole 7. The flushing fluid with a large flow rate carries the sand back to the wellhead. When the mud and sand are hardened, the injection pressure of the flushing fluid is increased. At this time, the piston 3 descends under high pressure, the large sand flushing hole 7 is staggered with the annular groove 5, and the flushing fluid can only be ejected from the small sand flushing hole 9. The high-pressure flushing fluid is ejected to impact the mud and sand to loosen it, and then the injection pressure is restored to normal. The large sand flushing hole 7 is connected with the annular groove 5, and the flushing fluid with a large flow rate brings the loosened sand out of the wellhead.
[0013] By setting a large normal pressure sand flushing hole 7 and a small sand flushing hole 9 to flush sand at the same time, a large flow of flushing fluid is used to carry the sand back to the wellhead. When the mud and sand are compacted with great strength, the pressure is increased and the high-pressure and high-speed flushing fluid of the small sand flushing hole 9 is used to impact the compacted sand. The sand in the well can be flushed out by repeated circulation. The sand flushing operation can be completed by only changing the pump pressure and flow rate, without the need to run different pipes multiple times.
Claims
1. A sand flushing device for drilling and repairing a well, comprising a sand flushing pipe (1), characterized in that: The upper part of the sand blasting pipe (1) is processed with an upper joint (2), the inner hole (12) of the sand blasting pipe (1) is connected with a piston (3) through a sealing ring clearance fit, the lower part of the sand blasting pipe (1) is connected with a retaining ring (4) through a thread, the lower part of the piston (3) is processed with a step cap (8), the step cap (8) is connected with the inner hole (12) of the retaining ring (4) through a clearance fit, the step cap (8) extends out of the retaining ring (4), a compression spring is provided between the step of the step cap (8) and the retaining ring (4), the upper part of the inner hole (12) of the sand blasting pipe (1) is processed into a step hole (1 1), the upper part of the piston (3) is pressed against the step of the step hole (11), the piston (3) is provided with an annular groove (5) on the lower side of the sealing ring, the top of the piston (3) is provided with a countersunk hole (10), the countersunk hole (10) and the annular groove (5) are connected through a side hole (6), a small sand flushing hole (9) is provided at the bottom of the countersunk hole (10), the small sand flushing hole (9) is connected with the outside at the position of the step cap (8), a large sand flushing hole (7) is provided on the wall of the sand flushing pipe (1), and the large sand flushing hole (7) is located at the inner hole (12) of the sand flushing pipe (1) at a position corresponding to the annular groove (5).
2. The sand flushing device for drilling and repairing wells according to claim 1, characterized in that: The large sand flushing holes (7) are evenly arranged along the circumference of the sand flushing pipe (1), and the small sand flushing holes (9) are evenly arranged along the circumference of the step cap (8). The total cross-sectional area of the large sand flushing holes (7) is 8 to 10 times the total cross-sectional area of the small sand flushing holes (9). The small sand flushing holes (9) are obliquely opened on the step cap (8) in the direction of the outer diameter, and the large sand flushing holes (7) are obliquely opened in the pipe wall of the sand flushing pipe (1) toward the lower side.
3. The sand flushing device for drilling and repairing wells according to claim 1, characterized in that: When the piston (3) descends to a certain distance, the annular groove (5) and the large sand-blasting hole (7) can be staggered with each other.