Anti-rotation device for dissolvable bridge plug

Abstract

The utility model relates to a kind of anti-rotation device of dissolvable bridge plug, it is related to oilfield downhole tool technical field, upper cap lower part thread sealing connection central tube, central tube lower part thread connection leading shoe, central tube is successively covered with advancing sleeve, rubber cylinder, vertebral body and slip below upper cap, slip falls on leading shoe, vertebral body is connected with slip by dovetail groove guide rail, advancing sleeve, vertebral body and central tube are connected by spline.This utility model has the beneficial effect that when the liquid in wellbore is rich in crude oil and does not meet the condition of dissolution reaction, the bridge plug is drilled by drilling tool, since central tube and advancing sleeve, vertebral body are connected by spline;vertebral body is connected with slip by dovetail groove guide rail, central tube and leading shoe are connected by thread, before slip anchoring is not removed, parts will not rotate each other, drilling tool will effectively drill each part of bridge plug, improve drilling efficiency;Drilling is complete, residual volume is small, can fall into well bottom and dissolve.

Description

TECHNICAL FIELD

[0001] The utility model relates to oilfield downhole tool technology field especially relates to a prevent rotation device of soluble bridge plug. BACKGROUND

[0002] Bridge plug is one of the main tools of staged fracturing technology, and is increasingly widely used in drilling operation, and the existing soluble bridge plug has the following two problems: one is that the bridge plug is accidentally set in the well during the well, and the downhole conditions for the dissolution reaction are not met, and the other is that after the bridge plug is used for layered fracturing operation, the liquid in the blowout return flow is rich in crude oil, and the dissolution reaction conditions are not met or the dissolution reaction is too slow, the center tube and the cone are synchronously rotated when the drilling tool is lowered into the well to drill the bridge plug, the drilling efficiency is low, the dissolution operation time is greatly prolonged, the downhole operation time is greatly increased, the production efficiency after fracturing is seriously reduced, and the oil exploitation cost is greatly increased. SUMMARY

[0003] In order to solve the problem of low efficiency when the soluble bridge plug does not meet the dissolution condition for drilling, the utility model provides a prevent rotation device of soluble bridge plug.

[0004] The technical scheme provided by the utility model is as follows: a prevent rotation device of soluble bridge plug, which comprises a cap, the cap is provided with a hand-off shearing screw hole, the lower part of the cap is threadedly connected with a center tube, the lower part of the center tube is threadedly connected with a leading shoe, the center tube is sequentially sleeved with a pushing sleeve, a rubber cylinder, a cone and a slip below the cap, the slip falls on the leading shoe, the number of the slip is four, the cone is connected with the slip through dovetail groove guide rails, and the slip is uniformly arranged along the circumference of the cone; the direction of the dovetail groove guide rail is that the cone descends and the slip moves outward.

[0005] The pushing sleeve, the cone and the center tube are connected through spline connection.

[0006] The slip is provided with a key groove which is opened upward from the bottom surface, the leading shoe is provided with four torsion bosses which extend to the periphery, and the torsion bosses are gap-connected with the key groove in width.

[0007] The key groove is connected with the torsion boss through one-way teeth, and the one-way teeth enable the slip to only move outward.

[0008] The pushing sleeve is connected with the center tube through setting pin connection.

[0009] The inner hole of the pushing sleeve is provided with an inner ring groove, the inner ring groove is provided with an elastic ring, and the center tube is provided with an outer ring groove in the lower part of the pushing sleeve.

[0010] The cap, the center tube, the pushing sleeve, the cone, the slip, the elastic ring and the leading shoe are made of soluble metal, and the rubber cylinder is made of soluble rubber.

[0011] The beneficial effects of this utility model are as follows: When the venting and backflowing liquid in the wellbore is rich in crude oil and does not meet the conditions for dissolution reaction, the drill string is lowered to drill open the bridge plug. Since the central tube, the push sleeve, and the cone are connected by splines; the cone is connected to the slips by a dovetail groove guide rail; and the central tube and the guide shoe are connected by threads, the components will not rotate relative to each other before the slips are released from anchoring. The drill string will effectively drill all parts of the bridge plug, improving drilling efficiency. The drilling is complete, the residual volume is small, and it can fall to the bottom of the well and dissolve. Attached Figure Description

[0012] Appendix Fig. 1 This is a schematic diagram of the structure of this utility model;

[0013] Appendix Fig. 2 This is a schematic diagram of the structure of the shoe in this utility model;

[0014] Appendix Fig. 3 This is a schematic diagram of the structure of the chuck in this utility model.

[0015] In the diagram, 1-upper cap, 2-center tube, 3-rubber sleeve, 4-propulsion sleeve, 5-cone, 6-locking slip, 61-keyway, 7-guide shoe, 71-torsion boss, 8-seat pin, 9-spline, 10-dovetail guide rail, 11-one-way tooth, 12-hand-release shearing screw hole, 13-elastic ring, 14-outer ring groove. Detailed Implementation

[0016] like Figs. 1-3 As shown, a soluble bridge plug anti-rotation device includes an upper cap 1 with a release shear screw hole 12. The lower part of the upper cap 1 is threadedly connected to a central tube 2, and the lower part of the central tube 2 is threadedly connected to a guide shoe 7. Below the upper cap 1, the central tube 2 is sequentially fitted with a push sleeve 4, a rubber sleeve 3, a cone 5, and a slip 6. The slip 6 rests on the guide shoe 7. There are four slips 6. The cone 5 is connected to the slip 6 through a dovetail groove guide rail 10. The slips 6 are evenly arranged along the circumference of the cone 5. The direction of the dovetail groove guide rail 10 is such that when the cone 5 descends, the slips 6 move outward.

[0017] The propulsion sleeve 4, the cone body 5, and the central tube 2 are connected by a spline 9;

[0018] The inner side of the shoe 6 has a keyway 61 extending upwards from the bottom, and four torsion bosses 71 extend outwards from the outer circle of the shoe 7. The torsion bosses 71 are fitted with the keyway 61 in width.

[0019] The upper end face of the keyway 61 is connected to the torsion boss 71 by a one-way tooth 11, which makes the slip 6 move only outward.

[0020] Because the key groove 61 and the torsion 71 connecting between the shoe 6 and the leading shoe 7, the key groove 61 and the torsion 71 connecting through the one-way tooth 11, after the drilling tool drills the center hole, before the shoe 6 is drilled completely, the shoe 6 is still anchored on the casing inner wall, only when the shoe 6 is drilled completely, the well bottom is only part of the leading shoe 7, which can fall into the well bottom and dissolve.

[0021] The advancing sleeve 4 is connected with the center pipe 2 through the setting pin 8.

[0022] The inner hole of the advancing sleeve 4 is provided with an inner ring groove, and the elastic ring 13 is arranged in the inner ring groove; the center pipe 2 is provided with an outer ring groove 14 at the lower part of the advancing sleeve 4; when the rubber sleeve 3 is set and the shoe 6 is anchored, the elastic ring 13 falls between the advancing sleeve 4 and the center pipe 2, thereby preventing setting failure.

[0023] The upper cap 1, the center pipe 2, the advancing sleeve 4, the vertebral body 5, the shoe 6, the elastic ring 13 and the leading shoe 7 are all made of soluble metal, and the rubber sleeve 3 is made of soluble rubber.

[0024] The working principle of the utility model is as follows:

[0025] 1, the utility model is connected with the explosive or hydraulic setting tool, and is conveyed to the designated position of the casing in the well by using the cable or the coiled tubing;

[0026] 2, the setting tool is started by blasting or other ways, the pressure of the setting tool acts on the advancing sleeve 4, the setting pin 8 is cut off, the advancing sleeve 4 descends, the advancing sleeve 4 moves downwards to push the vertebral body 5 to descend, the vertebral body 5 descends to force the shoe 6 to move outward, the shoe 6 is anchored on the casing inner wall, the advancing sleeve 4 continues to descend, the rubber sleeve 3 deforms and expands to set, at this time, the elastic ring 13 falls between the advancing sleeve 4 and the center pipe 2, thereby preventing setting failure;

[0027] 3, the cable is pulled up to drive the perforating gun to move, ignites and perforates after reaching the designated position, the perforating gun, the setting tool and other tool strings are pulled out after the perforating is completed, then the fracturing operation is carried out, and the well is closed after the fracturing is completed;

[0028] 4, when the liquid in the wellbore is rich in crude oil and does not meet the conditions of the dissolution reaction, the drilling tool is lowered to drill the bridge plug, because the center pipe 2 and the advancing sleeve 4 and the vertebral body 5 are connected through the spline 9, the vertebral body 5 is connected with the shoe 6 through the dovetail groove guide rail 10, and the center pipe 2 and the leading shoe 7 are connected through the thread, before the shoe 6 is anchored and removed, the components cannot rotate with each other, the drilling tool can effectively drill each part of the bridge plug, thereby improving the drilling efficiency; after the drilling is completed, the residual volume is small, and the residual part can fall into the well bottom and dissolve.

Claims

1. A device for preventing rotation of a soluble bridge plug, comprising an upper cap (1), characterized in that: The upper cap (1) has a hand-release shearing screw hole (12). The lower part of the upper cap (1) is threaded and connected to the central tube (2). The lower part of the central tube (2) is threaded and connected to the guide shoe (7). The central tube (2) is fitted with a push sleeve (4), a rubber sleeve (3), a cone (5) and a slip (6) in sequence below the upper cap (1). The slip (6) rests on the guide shoe (7). There are four slips (6). The cone (5) is connected to the slip (6) through the dovetail groove guide rail (10). The slips (6) are evenly arranged along the circumference of the cone (5). The direction of the dovetail groove guide rail (10) is: the cone (5) descends and the slip (6) moves outward. The propulsion sleeve (4), the cone body (5), and the central tube (2) are connected by a spline (9); The inner side of the card (6) has a keyway (61) extending upward from the bottom, and the outer circle of the shoe (7) has four torsion bosses (71) extending outwards. The torsion bosses (71) are in a clearance fit with the keyway (61) in width.

2. The anti-rotation device for a soluble bridge plug according to claim 1, characterized in that: The upper end face of the keyway (61) is connected to the torsion boss (71) by a one-way tooth (11), which makes the slip (6) move only outward.

3. The anti-rotation device for a soluble bridge plug according to claim 1, characterized in that: The push sleeve (4) is connected to the center tube (2) by a setting pin (8).

4. The anti-rotation device for a soluble bridge plug according to claim 1, characterized in that: The inner hole of the propulsion sleeve (4) has an inner ring groove, and an elastic ring (13) is provided in the inner ring groove. The center tube (2) has an outer ring groove (14) at the lower part of the propulsion sleeve (4).

5. The anti-rotation device for a soluble bridge plug according to claim 1, characterized in that: The cap (1), central tube (2), propulsion sleeve (4), cone (5), slip (6), elastic ring (13) and guide shoe (7) are all made of soluble metal, and the rubber tube (3) is made of soluble rubber.

Images