Liquid drainage type well washing device capable of preventing oil pipe from falling off

Abstract

The utility model belongs to the technical field of oil field production equipment, and particularly relates to a liquid drainage type oil pipe anti-disengagement well washing device. Comprising an upper connector, a taper sleeve, a main body center pipe, a steel ball, a tooth block, a ball seat, a protective sleeve, an upper soluble pin, a tooth block base, an upper compression spring, a positioning ring, a one-way leather cup, a tray, a lower soluble pin, a tray pressing cap, a liquid drainage sliding sleeve, a sliding control sleeve, an arch-shaped steel sheet, a connecting sleeve, a lower compression spring, a spring seat and a lower connector. An upper center blind hole and a lower center blind hole are formed in the main body central pipe, and a liquid drainage hole is formed above the lower center blind hole; a T-shaped opening is formed in the tooth block base; a threaded pin hole is formed in the tray; a steel sheet clamping groove is formed in the sliding control sleeve. The well flushing device can automatically anchor a pipe column in the state that the pipe column naturally droops, and a sleeve is not damaged; breakage of the oil pipe can be avoided; the pipe column is lifted up to release the pipe column automatically, so that the pipe column is prevented from being stuck due to sand, dirt and the like; liquid in the annulus can be automatically discharged when the oil pipe is lifted.

Description

Technical Field

[0001] This utility model belongs to the field of oilfield production equipment, specifically relating to a draining type tubing anti-detachment well cleaning device. Background Technology

[0002] Currently, during the production process of pumping wells, frequent well cleaning is required due to wax and scale buildup in the wellbore. Frequent well cleaning not only affects production and wastes resources, but also easily causes reservoir contamination. Furthermore, when the tubing string moves up and down with the pumping unit (or the polished rod breaks off), the tubing threads are prone to fatigue and may fall into the well, significantly impacting oil production. Summary of the Invention

[0003] To address the aforementioned technical problems, this utility model provides a draining tubing anti-detachment well-washing tool. This tool can automatically anchor the tubing string in a naturally drooping state, and can also achieve well-washing without pressurizing the oil layer. Furthermore, during well workover operations when pulling out the tubing, it can drain the fluid inside the wellbore into the well.

[0004] The technical solution adopted by this utility model is as follows: a draining type tubing anti-detachment well cleaning device, which includes an upper connector, a tapered sleeve, a main body center tube, a steel ball, a toothed block, a ball seat, a protective sleeve, an upper soluble pin, a toothed block base, an upper compression spring, a positioning ring, a one-way cup, a tray, a lower soluble pin, a tray pressure cap, a draining sliding sleeve, a sliding control sleeve, an arc-shaped steel plate, a connecting sleeve, a lower compression spring, a spring seat, and a lower connector;

[0005] The upper and lower parts of the main central tube are respectively provided with upper and lower center blind holes. A drain hole is provided above the lower center blind hole, and a limiting ball seat is provided below it. A limiting steel ball is locked inside the limiting ball seat. The tooth block base is provided with circumferentially distributed T-shaped openings, and a pin threaded hole is provided below the T-shaped openings. The lower part of the one-way cup is provided with a threaded cup skeleton. The tray is provided with threaded pin holes. The upper and lower parts of the sliding control sleeve are provided with symmetrical and circumferentially distributed steel plate slots.

[0006] The upper connector is threaded to the upper end of the main body center tube, and the tapered sleeve is fitted onto the main body center tube below the upper connector. The tooth block base is fitted onto the main body center tube below the tapered sleeve and fixed by an upper fusible pin. The tooth block is installed in the T-shaped opening of the tooth block base, and a protective sleeve is threaded onto the outside of the T-shaped opening. The ball seat is located in the main body center tube corresponding to the tooth block, and the steel ball is set at the top of the ball seat. The positioning ring is fitted below the tooth block base and limited by a ring platform on the main body center tube. The upper compression spring is fitted onto the main body center tube between the tooth block base and the positioning ring. The tray is fitted onto the main body center tube below the positioning ring and fixed by a lower fusible pin. The one-way cup seat is mounted on the tray, and the one-way cup... The cup frame is fitted outside the drain hole and is limited by the ring platform on the main body central tube. An O-ring is provided on the upper part of the cup frame, and the O-ring is located above the drain hole. The tray pressure cap is installed on the bottom of the tray by threads. The sliding control sleeve is fitted on the main body central tube below the tray. The drain sliding sleeve is fitted on the lower part of the tray and the upper part of the sliding control sleeve, and is threaded to the top of the sliding control sleeve. The connecting sleeve is threaded to the bottom of the sliding control sleeve. The arc-shaped steel plate is installed in the steel plate slot of the sliding control sleeve. The lower connector is threaded to the lower end of the main body central tube, and the spring seat is threaded to the top of the lower connector. The lower compression spring is fitted on the main body central tube between the connecting sleeve and the spring seat.

[0007] Furthermore, the number of tooth blocks is 3.

[0008] Furthermore, the number of bow-shaped steel plates is four.

[0009] Furthermore, the ball seat has two sealing ring grooves on its exterior, and O-rings are fitted onto the sealing ring grooves.

[0010] Furthermore, the inner wall of the cup frame is provided with a sealing ring groove, and an O-ring is installed in the sealing ring groove.

[0011] Furthermore, the upper part of the installed tooth block contacts the lower surface of the cone sleeve.

[0012] Furthermore, the connecting sleeve at the bottom of the tray has a notch.

[0013] Furthermore, the sliding control sleeve is made of nylon.

[0014] Furthermore, the one-way cup is made of rubber.

[0015] Furthermore, the upper and lower soluble pins are made of magnesium metal soluble material.

[0016] Furthermore, after inserting the ball seat into the main body's central tube, two through holes are drilled in the central tube at the corresponding positions, and the ball seat is welded to the main body's central tube at the through holes.

[0017] Furthermore, the diameter of the upper soluble pin is smaller than that of the lower soluble pin; the former is an M8 soluble pin, and the latter is an M12 soluble pin. The lower soluble pin is melted after the upper soluble pin has melted, that is, after the tubing string is anchored. This prevents the tubing string from being pulled back during the well running process, which could easily cause the one-way cup to descend and the limiting steel ball to fail to return to its original position after ejection, resulting in fluid entering the formation during well flushing.

[0018] The beneficial effects of this utility model are as follows: It provides a draining type tubing anti-detachment well cleaning tool, the main advantages of which are as follows:

[0019] (1) It can automatically anchor the tubing when the tubing is hanging naturally without damaging the casing;

[0020] (2) It can prevent oil pipe breakage caused by various reasons;

[0021] (3) After anchoring, it can increase the stroke of the plunger in the pump barrel (increase the liquid) and protect and straighten the one-way cup;

[0022] (4) The tubing is automatically unblocked when the tubing is lifted, and the tubing will not be blocked due to sand, scale or other reasons;

[0023] (5) It can achieve well washing without pressing the oil layer;

[0024] (6) It can automatically drain the liquid in the annulus when the oil pipe is started. Attached Figure Description

[0025] Figure 1 This is a half-section diagram of a drain-type tubing anti-detachment well cleaning device;

[0026] Figure 2 This is a schematic diagram of the cross-sectional structure of the main central tube;

[0027] Figure 3 This is a schematic diagram of a half-section of the upper connector;

[0028] Figure 4 This is a schematic diagram of a half-section of the tapered sleeve.

[0029] Figure 5 This is a half-section diagram of the tooth block base;

[0030] Figure 6 yes Figure 5 Top view;

[0031] Figure 7 yes Figure 5 View from direction A;

[0032] Figure 8 This is a schematic diagram of a half-section of the protective case;

[0033] Figure 9 This is a schematic diagram of a half-section of the positioning ring;

[0034] Figure 10 This is a schematic diagram of the cross-sectional structure of the tooth block;

[0035] Figure 11 This is a schematic diagram of a half-section of a one-way leather cup;

[0036] Figure 12 This is a cross-sectional structural diagram of the leather cup frame;

[0037] Figure 13 This is a cross-sectional structural diagram of the pallet;

[0038] Figure 14 yes Figure 13 A bottom view;

[0039] Figure 15 This is a cross-sectional structural diagram of the pallet cap;

[0040] Figure 16 This is a schematic diagram of a half-section of the drain sleeve;

[0041] Figure 17 This is a half-section diagram of the sliding control sleeve;

[0042] Figure 18 yes Figure 17 Top view;

[0043] Figure 19 This is a schematic diagram of a half-section of the connecting sleeve;

[0044] Figure 20 This is a schematic diagram of a half-section of the spring seat;

[0045] Figure 21 This is a schematic diagram of the cross-sectional structure of the ball seat;

[0046] Figure 22 This is a schematic diagram of a half-section of the lower connector.

[0047] In the diagram, 1. Upper connector; 2. Conical sleeve; 3. Main body center tube; 4. Steel ball; 5. Tooth block; 6. Ball seat; 7. Protective sleeve; 8. Upper soluble pin; 9. Tooth block base; 10. Upper compression spring; 11. Positioning ring; 12. One-way cup; 13. Tray; 14. Lower soluble pin; 15. Tray pressure cap; 16. Drainage sleeve; 17. Sliding control sleeve; 18. Bow-shaped steel plate; 19. Connecting sleeve; 20. Lower compression spring; 21. Spring seat; 22. Lower connector; 301. Upper center blind hole; 302. Drainage hole; 303. Lower center blind hole; 304. Limiting ball seat; 305. Limiting steel ball; 901. T-shaped opening; 902. Pin threaded hole; 121. Cup frame; 131. Threaded pin hole; 171. Steel plate slot. Detailed Implementation Example

[0048] Referring to the figures, a draining type tubing anti-detachment well cleaning tool is provided, comprising an upper connector 1, a cone sleeve 2, a main body center tube 3, a steel ball 4, a toothed block 5, a ball seat 6, a protective sleeve 7, an upper soluble pin 8, a toothed block base 9, an upper compression spring 10, a positioning ring 11, a one-way cup 12, a tray 13, a lower soluble pin 14, a tray pressure cap 15, a draining sliding sleeve 16, a sliding control sleeve 17, an arc-shaped steel plate 18, a connecting sleeve 19, a lower compression spring 20, a spring seat 21, and a lower connector 22.

[0049] The upper and lower parts of the main central tube are respectively provided with an upper center blind hole 301 and a lower center blind hole 303. A drain hole 302 is provided above the lower center blind hole, and a limiting ball seat 304 is provided below it. A limiting steel ball 305 is locked inside the limiting ball seat. The tooth block base is provided with circumferentially distributed T-shaped openings 901, and a pin threaded hole 902 is provided below the T-shaped openings. The lower part of the one-way cup is provided with a threaded cup skeleton 121. The tray is provided with a threaded pin hole 131. The upper and lower parts of the sliding control sleeve are provided with symmetrical and circumferentially distributed steel plate slots 171. The upper soluble pin is an M8 soluble pin, and the lower soluble pin is an M12 soluble pin.

[0050] The upper connector is threaded to the upper end of the main body center tube, and the tapered sleeve is fitted onto the main body center tube below the upper connector. The tooth block base is fitted onto the main body center tube below the tapered sleeve and fixed by an upper fusible pin. The tooth block is installed in the T-shaped opening of the tooth block base, and a protective sleeve is threaded onto the outside of the T-shaped opening. The ball seat is located in the main body center tube corresponding to the tooth block, and the steel ball is set at the top of the ball seat. The positioning ring is fitted below the tooth block base and limited by a ring platform on the main body center tube. The upper compression spring is fitted onto the main body center tube between the tooth block base and the positioning ring. The tray is fitted onto the main body center tube below the positioning ring and fixed by a lower fusible pin. The one-way cup seat is mounted on the tray, and the one-way cup... The cup frame is fitted outside the drain hole and is limited by the ring platform on the main body central tube. An O-ring is provided on the upper part of the cup frame, and the O-ring is located above the drain hole. The tray pressure cap is installed on the bottom of the tray by threads. The sliding control sleeve is fitted on the main body central tube below the tray. The drain sliding sleeve is fitted on the lower part of the tray and the upper part of the sliding control sleeve, and is threaded to the top of the sliding control sleeve. The connecting sleeve is threaded to the bottom of the sliding control sleeve. The arc-shaped steel plate is installed in the steel plate slot of the sliding control sleeve. The lower connector is threaded to the lower end of the main body central tube, and the spring seat is threaded to the top of the lower connector. The lower compression spring is fitted on the main body central tube between the connecting sleeve and the spring seat.

[0051] There are 3 tooth blocks; there are 4 bow-shaped steel plates; the ball seat has two sealing ring grooves on the outside, and O-rings are fitted on the sealing ring grooves; the inner wall of the cup frame has sealing ring grooves, and O-rings are installed in the sealing ring grooves; the upper part of the installed tooth block contacts the lower surface of the cone sleeve; the connecting sleeve at the bottom of the tray has a notch; the sliding control sleeve is made of nylon; the one-way cup is made of rubber.

[0052] The drain-type tubing anti-detachment well-washing tool is lowered below the sand screen pipe of the pumping unit. Approximately three hours after the tubing string is lowered, the upper soluble pin automatically melts (the lower soluble pin automatically melts after the well-washing tool is anchored). After the upper soluble pin melts, the upper compression spring pushes the toothed block upwards, and the toothed block expands outwards along the conical sleeve, putting the well-washing tool into an anchored state (the toothed block and conical sleeve cooperate to achieve automatic anchoring, meaning that when the tubing string elastically contracts to its limit, it will no longer elastically elongate or descend). The tubing string neither bends nor creeps, increasing the effective stroke of the plunger within the pump barrel while avoiding wear on the one-way cup caused by tubing string creep. During reverse washing, under the action of the one-way cup and the steel ball and ball seat, the washing fluid will not enter the formation, but directly enters the pump barrel from the screen pipe above the well-washing tool, achieving well washing without pressurizing the oil layer. During well workover operations, when the tubing is pulled in, the arc-shaped steel plate on the sliding controller is compressed by the casing coupling, which in turn compresses the compression spring and drives the draining sleeve downward. After descending, the draining sleeve can no longer lock the limiting steel ball (at this point, the soluble pin has already melted). The liquid inside the casing forces the one-way cup downward and pushes the limiting steel ball away from the limiting blind hole hemispherical seat on the main body central tube and downward, exposing the drain hole of the main body central tube, thus achieving automatic draining and automatically draining the liquid in the annulus into the well.

Claims

1. A drain-type tubing anti-detachment well-washing device, characterized in that: The draining tubing anti-detachment well cleaning tool includes an upper connector, a tapered sleeve, a main central tube, a steel ball, a toothed block, a ball seat, a protective sleeve, an upper soluble pin, a toothed block base, an upper compression spring, a positioning ring, a one-way cup, a tray, a lower soluble pin, a tray pressure cap, a draining sliding sleeve, a sliding control sleeve, an arc-shaped steel plate, a connecting sleeve, a lower compression spring, a spring seat, and a lower connector. The upper and lower parts of the main central tube are respectively provided with an upper center blind hole and a lower center blind hole. A drain hole is provided above the lower center blind hole, and a limiting ball seat is provided below it, with a limiting steel ball inserted inside the limiting ball seat. The tooth block base is provided with circumferentially distributed T-shaped openings, and a pin threaded hole is provided below the T-shaped openings. The lower part of the one-way cup is provided with a threaded cup skeleton. The tray is provided with a threaded pin hole. The upper and lower parts of the sliding control sleeve are provided with symmetrical and circumferentially distributed steel plate slots. The diameter of the upper soluble pin is smaller than the diameter of the lower soluble pin. The upper connector is threaded to the upper end of the main body central tube, and the conical sleeve is fitted onto the main body central tube below the upper connector; the tooth block base is fitted onto the main body central tube below the conical sleeve and fixed by an upper soluble pin; the tooth block is installed in the T-shaped opening of the tooth block base, and a protective sleeve is threaded onto the outside of the T-shaped opening; the ball seat is located inside the main body central tube corresponding to the tooth block and is fixed to the main body central tube by welding, with a steel ball positioned at the top of the ball seat; the positioning ring is fitted onto the lower part of the tooth block base and limited by a ring platform on the main body central tube; the upper compression spring is fitted onto the main body central tube between the tooth block base and the positioning ring; the tray is fitted onto the main body central tube below the positioning ring and fixed by a lower soluble pin; the one-way cup seat is mounted on the tray. The upper part of the one-way cup is fitted with a cup frame outside the drain hole and is limited by a ring platform on the main body central tube. An O-ring is provided on the upper part of the cup frame, and the O-ring is located above the drain hole. The tray pressure cap is threadedly installed on the bottom of the tray. The sliding control sleeve is fitted on the main body central tube below the tray. The drain sliding sleeve is fitted on the lower part of the tray and the upper part of the sliding control sleeve and is threadedly connected to the top of the sliding control sleeve. The connecting sleeve is threadedly connected to the bottom of the sliding control sleeve. The arc-shaped steel plate is installed in the steel plate slot of the sliding control sleeve. The lower connector is threadedly connected to the lower end of the main body central tube, and the spring seat is threadedly installed on the top of the lower connector. The lower compression spring is fitted on the main body central tube between the connecting sleeve and the spring seat.

2. The draining type tubing anti-detachment well cleaning device according to claim 1, characterized in that: The number of tooth blocks is 3.

3. The draining type tubing anti-detachment well cleaning device according to claim 1, characterized in that: The number of the bow-shaped steel plates is 4.

4. The draining type tubing anti-detachment well cleaning device according to claim 1, characterized in that: The ball seat has two sealing ring grooves on its outside, and O-rings are fitted on the sealing ring grooves.

5. The draining type tubing anti-detachment well cleaning device according to claim 1, characterized in that: The inner wall of the leather cup frame is provided with a sealing ring groove, and an O-ring is installed in the sealing ring groove.

6. The draining type tubing anti-detachment well cleaning device according to claim 1, characterized in that: The upper part of the installed tooth block contacts the lower surface of the cone sleeve.

7. The draining type tubing anti-detachment well cleaning device according to claim 1, characterized in that: The connecting sleeve at the bottom of the tray has a notch.

8. The draining type tubing anti-detachment well cleaning device according to claim 1, characterized in that: The sliding control sleeve is made of nylon.

9. The draining type tubing anti-detachment well cleaning device according to claim 1, characterized in that: The one-way leather cup is made of rubber.

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