CN213478288U - Tool for plugging and nesting karst cave - Google Patents

Abstract

The utility model relates to a cave plugging and nesting tool, wherein the lower end of an upper joint is sequentially screwed with an initiation joint, an intermediate joint and a core pipe joint, the lower end of the core pipe joint is screwed with a core pipe, the periphery of the core pipe is wound with an initiation cable, the upper end of the central hole of the core pipe joint is inserted with an explosion transfer device, a partition plate ignition device is pressed above the explosion transfer device, an initiator is arranged above the partition plate ignition device, and the initiator is embedded in the central hole of the initiation joint; a detonation piston is arranged in a central hole of the upper joint, a large-diameter section at the lower part of the detonation piston is fixed in a piston outer bushing through a piston shear pin, the piston outer bushing is embedded in a first step hole of the detonation joint, and a firing pin is arranged at the center of the bottom of the detonation piston; the periphery of the lower end of the core pipe joint is hung with a nesting seam pipe through an upper pin, the lower end of the nesting seam pipe is hung on a seam pipe supporting body through a lower pin, and the seam pipe supporting body is fixed on the periphery of the core pipe. The tool can form a cage-shaped structure at the karst cave mouth, so that the plugging material can stay at the leakage passage.

Description

Tool for plugging and nesting karst cave

Technical Field

The utility model relates to an oil drilling device, in particular to tool of nesting of solution cavity shutoff belongs to oil drilling equipment technical field.

Background

The lost circulation is a common worldwide problem in drilling engineering, particularly serious loss which occurs when drilling encounters faults, large cracks and karst caves is often expressed as loss of drilling fluid and return, and the drilling cannot be carried out next step, sometimes even collapse, drill sticking, overflow or blowout of well walls can be caused, some of the holes can only abandon the drilled well and distribute the well again, and under the condition, a large amount of materials and time are consumed for processing the lost circulation, so that huge economic loss is caused.

The leakage stoppage adopts one or more materials, and an effective plugging layer with certain pressure bearing capacity is formed at the leakage passage. In recent years, various studies and attempts have been made by many domestic units or individuals for large-scale leakages such as large cracks and karst caves. The plugging technology and the material which can effectively deal with the karst cave leakage are less, and the universality is not strong. Although the technologies of high-concentration conventional leakage stopping slurry, bridge plug leakage stopping, cement slurry leakage stopping, chemical gel leakage stopping and the like are generally crossed, combined and repeatedly applied, and have certain effect on small-sized cracks and karst cave leakage loss, the leakage stopping effect is not obvious on larger cracks and karst cave leakage loss, a large amount of expensive leakage stopping materials are consumed, the treatment time is long, and the economic loss is huge. The lost circulation material is difficult to stay in a lost circulation channel because the lost circulation material is easily taken away by lost drilling fluid, and an effective blocking wall cannot be formed in the lost circulation channel, so that the lost circulation success rate is low.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the problem that exists among the prior art, provide a cave shutoff instrument of nesting, can form cage-like structure at the cave mouth, the lost circulation material of being convenient for can stop in leakage passageway department, is difficult for being taken away by the drilling fluid, can be formed with the artifical wall of a well of certain intensity in leakage passageway department.

In order to solve the technical problem, the utility model discloses a cave plugging and nesting tool, include the top connection who connects with the top drilling rod mutually soon, the lower extreme of top connection connects with the initiation connector soon, and the lower extreme of initiation connector connects with the intermediate head soon, and the lower extreme of intermediate head connects with the core union soon, connects with the core pipe in the lower port of core union soon, the periphery of core pipe twines there is the detonating cord, peg graft on the centre bore of core pipe joint and have the booster that can detonate the detonating cord, baffle ignition is pressed to the top of booster, baffle ignition is located the centre bore of intermediate head, the detonator is put to the top of baffle ignition, the detonator inlays in the centre bore of detonating joint; the ignition device comprises an upper joint, a piston outer bushing, a first step hole, an ignition piston, a piston shear pin, a firing pin and a firing pin, wherein the ignition piston is arranged in the central hole of the upper joint, the large-diameter section of the lower portion of the ignition piston is pressed below the upper joint and is fixed in the piston outer bushing through the piston shear pin, the piston outer bushing is embedded in the first step hole of the ignition joint, and the center of the bottom of the ignition piston is provided with the firing; the periphery of the lower end of the core pipe joint is hung with a nesting seam pipe through an upper pin, the lower end of the nesting seam pipe is hung on a seam pipe supporting body through a lower pin, and the seam pipe supporting body is fixed on the periphery of the core pipe.

Compared with the prior art, the utility model discloses following beneficial effect has been obtained: when the drill is subjected to karst cave leakage and the specific position, size and height of the karst cave are determined, the karst cave plugging and nesting tool is put down to the karst cave opening, and the effective length of the nesting seam pipe is greater than the height of the karst cave opening. The drilling fluid is pressurized to a set value, a piston shear pin is sheared, an initiation piston slides downwards, a firing pin impacts an initiator to detonate the initiation piston, a detonating cord is ignited through a partition plate detonating device and an explosion propagation device, a core tube is burst broken by shock waves generated by explosion of the detonating cord, and the nesting seam tube is expanded into an ellipsoidal cage shape and is clamped in a cave opening. And then injecting a plugging material into the underground, wherein the plugging material moves forward along with the flow of well drilling fluid, large particles are intercepted in the cage-shaped frame, small particles are intercepted by the large particles, the leakage loss is gradually reduced or prevented from leaking along with the accumulation of the plugging material at the karst cave opening, most injected cement stays in the nesting structure and is not taken away by the leaked drilling fluid, but stays in the nesting structure and then is solidified, so that a plugging wall with certain strength is formed at a leakage passage, the leakage recovery is reduced, and the success rate of plugging is improved.

As the improvement of the utility model, the strip seam on the seam pipe of nesting is located the middle section at the seam pipe of nesting, and each strip seam is equal and parallel to each other along axial extension, length, and each strip seam evenly distributed is on the circumference of the seam pipe of nesting. The upper end and the lower end of the nesting seam pipe are not slotted, the strength is ensured, the nesting seam pipe is clamped on the upper side and the lower side of the opening of the slot, the strength of the slotted seam is weak, when the nesting seam pipe is impacted by explosion, each pipe piece is bent outwards to form a cage shape, and the upper pin and the lower pin at the two ends of the nesting seam pipe are cut off. The seams are evenly distributed, so that the nesting seam pipe expands more evenly.

As a further improvement, the strip seam nodules are evenly arranged on the seams and on the two sides of the connecting strip seam, and the strip seam nodules on the two adjacent seams are located on the same cross section in the height direction. The strip seam knot makes each seam still keep certain intensity on the basis of weakening, when avoiding suffering the blast shock wave, warp too big. The seam nodes are located on the same cross section, so that the deformation of the pipe pieces is similar.

As the utility model discloses a further improvement, the distance between the strip seam knot on each strip seam is 165 ~ 190mm, and the height of each strip seam knot is 10 mm. The cage-shaped frame formed after explosion is relatively symmetrical and has better molding.

As a further improvement, the inner wall of the piston outer liner is parallel and level with the second step hole of the detonation joint, the third step hole aperture of the detonation joint is greater than the root diameter of the firing pin, and the detonator is embedded in the fourth step hole of the detonation joint. The inner wall of the piston outer bushing is flush with the second step hole of the initiation connector, so that the initiation piston can slide down conveniently, and the third step hole of the initiation connector is used as the stroke of the firing pin.

As a further improvement of the utility model, the winding density of the detonating cord in the middle section of the core tube is greater than that at both ends. So that the explosive force of the middle section of the core tube is larger than that of the two ends, and the nesting seam tube is more favorable for expanding into an ellipsoidal cage shape.

As a further improvement of the utility model, the nesting seam pipe is suspended with an inner layer and an outer layer, and the strip seams on the inner layer and the outer layer of nesting seam pipe are staggered. Can avoid overlarge seam in the middle section of the cage-shaped structure and is beneficial to better intercepting the plugging material.

As a further improvement of the utility model, be equipped with the radial hole of top connection on the circumference of top connection, the inner port quilt in the radial hole of top connection the upper end of priming piston is sealed. When the shear pin of the piston shear pin is sheared, the detonating piston slides downwards to expose the upper joint radial hole, drilling fluid in the drill rod flows out from the upper joint radial hole, the pressure at the wellhead fluctuates violently, and constructors know that the underground is exploded to nest through the fluctuation of the drilling fluid pressure above the well.

As a further improvement of the utility model, the guide shoe is installed to the lower extreme of core pipe. The guide shoe can guide the drill rod to move downwards, and the downward resistance is reduced.

Drawings

Fig. 1 is a front view of the cave plugging and nesting tool of the present invention.

Figure 2 is a front view of the nesting seam tube of figure 1.

Fig. 3 is an enlarged view of a portion of the nesting tube of fig. 1.

Fig. 4 is a cross-sectional view a-a of fig. 2.

In the figure: 1. an upper joint; 1a, an upper joint radial hole; 2. a detonating joint; 3. an intermediate joint; 4. a core tube joint; 5. a core tube; 6. a priming piston; 6a, a striker; 6b, piston shear pins; 7. a piston outer liner; 8. an initiator; 9. a bulkhead igniter; 10. an explosion propagation device; 11. a detonating cord; 12. building a nest and sewing the pipe; 12a, strip seam; a seam knot; 12c, upper pins; 12d, lower pin; 13. a tube sewing support; 14. a guide shoe.

Detailed Description

As shown in fig. 1 to 4, the cave plugging and nesting tool of the present invention comprises an upper joint 1 screwed with an upper drill rod, wherein the lower end of the upper joint 1 is screwed with a detonating joint 2, the lower end of the detonating joint 2 is screwed with an intermediate joint 3, the lower end of the intermediate joint 3 is screwed with a core pipe joint 4, the lower port of the core pipe joint 4 is screwed with a core pipe 5, the periphery of the core pipe 5 is wound with a detonating cord 11, the upper end of the central hole of the core pipe joint 4 is inserted with a booster 10 capable of detonating the detonating cord 11, a partition plate detonating device 9 is pressed above the booster 10, the partition plate detonating device 9 is positioned in the central hole of the intermediate joint 3, a detonator 8 is arranged above the partition plate detonating device 9, and the detonator 8 is embedded in the central hole of the; a detonation piston 6 is arranged in a central hole of the upper joint 1, a large-diameter section at the lower part of the detonation piston 6 is pressed below the upper joint 1 and is fixed in a piston outer bushing 7 through a piston shear pin 6b, the piston outer bushing 7 is embedded in a first step hole of the detonation joint 2, and a firing pin 6a capable of initiating an initiator 8 is arranged in the center of the bottom of the detonation piston 6; the periphery of the lower end of the core tube joint 4 is hung with a nesting seam tube 12 through an upper pin 12c, the lower end of the nesting seam tube 12 is hung on a seam tube supporting body 13 through a lower pin 12d, and the seam tube supporting body 13 is fixed on the periphery of the core tube 5.

When the drill is subjected to karst cave leakage and the specific position, size and height of the karst cave are determined, the karst cave plugging and nesting tool is put down to the karst cave opening, and the effective length of the nesting seam tube 12 is larger than the height of the karst cave opening. The drilling fluid is pressurized to a set value, the piston shear pin 6b is sheared, the detonating piston 6 slides downwards, the firing pin 6a impacts the detonator 8 to detonate the detonating piston, the detonating cord 11 is ignited through the clapboard detonating device 9 and the booster 10, and the core tube 5 is burst by shock waves generated by the explosion of the detonating cord 11, so that the nesting seam tube 12 is expanded into an ellipsoidal cage shape and is stuck in the karst cave mouth. And then injecting a plugging material into the underground, wherein the plugging material moves forward along with the flow of well drilling fluid, large particles are intercepted in the cage-shaped frame, small particles are intercepted by the large particles, the leakage loss is gradually reduced or prevented from leaking along with the accumulation of the plugging material at the karst cave opening, most injected cement stays in the nesting structure and is not taken away by the leaked drilling fluid, but stays in the nesting structure and then is solidified, so that a plugging wall with certain strength is formed at a leakage passage, the leakage recovery is reduced, and the success rate of plugging is improved.

The strip seams 12a of the nesting seam tube 12 are located in the middle section of the nesting seam tube 12, the strip seams 12a extend axially, are equal in length and are parallel to each other, and the strip seams 12a are evenly distributed on the circumference of the nesting seam tube 12. The upper end and the lower end of the nesting seam pipe 12 are not provided with slits, the strength is ensured, the nesting seam pipe is clamped on the upper side and the lower side of the opening of the hole, the strength of the slit 12a is weak, when the pipe pieces are impacted by explosion, the pipe pieces are respectively bent outwards to form a cage shape, and the upper pin 12c and the lower pin 12d at the two ends of the nesting seam pipe 12 are cut off. The uniform distribution of the seams 12a allows for a more uniform expansion of the nesting seam tube 12.

A plurality of seam knots 12b connected with two sides of each seam 12a are respectively and uniformly arranged on each seam 12a, and the seam knots 12b on two adjacent seams 12a are positioned on the same cross section in the height direction. The seam knot 12b ensures that each seam 12a still keeps certain intensity on the basis of weakening, and avoids too large deformation when suffering from explosion shock waves. The slot nodules 12b are located on the same cross-section so that the tube pieces deform approximately.

The distance between the seam knots 12b on each seam 12a is 165-190 mm, and the height of each seam knot 12b is 10 mm.

The inner wall of the piston outer bushing 7 is flush with the second stepped hole of the initiation connector 2, the diameter of the third stepped hole of the initiation connector 2 is larger than the diameter of the root of the firing pin 6a, and the initiator 8 is embedded in the fourth stepped hole of the initiation connector 2. The inner wall of the piston outer bushing 7 is flush with the second stepped hole of the initiation sub 2, so that the initiation piston 6 slides down, and the third stepped hole of the initiation sub 2 is used as the stroke of the striker 6a.

The winding density of the detonating cord 11 at the middle section of the core tube 5 is greater than that at both ends. So that the explosive force of the middle section of the core tube 5 is larger than that of the two ends, and the nesting seam tube 12 is more favorable to expand into an ellipsoidal cage shape.

The inner and outer layers of the nesting seam pipe 12 are hung, and the strip seams 12a on the nesting seam pipe 12 of the inner and outer layers are staggered. Can avoid overlarge seam in the middle section of the cage-shaped structure and is beneficial to better intercepting the plugging material.

An upper joint radial hole 1a is formed in the circumference of the upper joint 1, and the inner port of the upper joint radial hole 1a is closed by the upper end of the priming piston 6. When the shear pin of the piston shear pin 6b is sheared, the detonating piston 6 slides downwards to expose the upper joint radial hole 1a, drilling fluid in the drill rod flows out from the upper joint radial hole 1a, the pressure at the wellhead fluctuates violently, and constructors know that the underground is exploded and nested through the fluctuation of the drilling fluid pressure above the ground.

The lower end of the core tube 5 is provided with a guide shoe 14 to guide the drill rod to descend, thereby reducing descending resistance.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention. In addition to the above embodiments, the present invention may have other embodiments. All the technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope claimed by the present invention. The undescribed technical features of the present invention can be realized by or using the prior art, and are not described herein again.

Claims (9)

1. The utility model provides a cave shutoff tool of nesting, includes the top connection who connects soon mutually with the top drilling rod, its characterized in that: the lower end of the upper joint is screwed with a detonating joint, the lower end of the detonating joint is screwed with a middle joint, the lower end of the middle joint is screwed with a core pipe joint, a core pipe is screwed in the lower port of the core pipe joint, a detonating cord is wound on the periphery of the core pipe, the upper end of the central hole of the core pipe joint is spliced with an exploder which can detonate the detonating cord, a partition plate detonating device is pressed above the exploder, the partition plate detonating device is positioned in the central hole of the middle joint, a detonator is arranged above the partition plate detonating device, and the detonator is embedded in the central hole of the detonating joint; the ignition device comprises an upper joint, a piston outer bushing, a first step hole, an ignition piston, a piston shear pin, a firing pin and a firing pin, wherein the ignition piston is arranged in the central hole of the upper joint, the large-diameter section of the lower portion of the ignition piston is pressed below the upper joint and is fixed in the piston outer bushing through the piston shear pin, the piston outer bushing is embedded in the first step hole of the ignition joint, and the center of the bottom of the ignition piston is provided with the firing; the periphery of the lower end of the core pipe joint is hung with a nesting seam pipe through an upper pin, the lower end of the nesting seam pipe is hung on a seam pipe supporting body through a lower pin, and the seam pipe supporting body is fixed on the periphery of the core pipe.

2. A cave plugging nesting tool according to claim 1, wherein: the strip seams on the nesting seam pipe are positioned in the middle section of the nesting seam pipe, the strip seams extend axially, are equal in length and are parallel to each other, and the strip seams are uniformly distributed on the circumference of the nesting seam pipe.

3. A cave plugging nesting tool according to claim 2, wherein: the seam is evenly provided with a plurality of seam nodes which are connected with the two sides of the seam, and the seam nodes on two adjacent seams are positioned on the same cross section in the height direction.

4. A cave plugging nesting tool according to claim 3, wherein: the distance between the seam nodes on each seam is 165-190 mm, and the height of each seam node is 10 mm.

5. A cave plugging nesting tool according to claim 1, wherein: the inner wall of the piston outer bushing is flush with the second step hole of the detonation joint, the diameter of the third step hole of the detonation joint is larger than the diameter of the root of the firing pin, and the detonator is embedded in the fourth step hole of the detonation joint.

6. A cave plugging nesting tool according to claim 1, wherein: and the winding density of the detonating cord at the middle section of the core tube is greater than that at the two ends.

7. A cave plugging nesting tool according to claim 1, wherein: the nesting seam pipe is suspended with an inner layer and an outer layer, and strip seams on the nesting seam pipe of the inner layer and the outer layer are staggered.

8. A cave plugging nesting tool according to claim 1, wherein: and an upper joint radial hole is formed in the circumference of the upper joint, and the inner port of the upper joint radial hole is closed by the upper end of the detonation piston.

9. A cave plugging nesting tool according to any one of claims 1 to 8, wherein: the lower end of the core tube is provided with a guide shoe.

Images