CN219316926U - Failure-proof oil extraction device for cannula oil extraction well - Google Patents

Abstract

The utility model discloses an anti-failure oil extraction device of a cannula oil extraction well, wherein a drillable bridge plug is arranged below an oil layer, a drillable cannula oil extraction bridge plug is arranged above the oil layer, a cannula is inserted into a central pipe and is mutually sealed, an overcurrent purifier, a telescopic compensator and an oil pump are arranged above the cannula, and the upper part of the oil pump is connected with a tail pipe and is supported on the inner wall of a sleeve through a hydraulic anchor; the upper end of the compensation inner tube of the telescopic compensator is screwed at the lower end of the compensation upper joint, the compensation outer tube is sleeved on the periphery of the compensation inner tube, the lower end of the compensation outer tube is screwed with the compensation lower joint, the inner wall of the sealing section at the upper end of the compensation outer tube is sealed with the compensation inner tube, an outer tube stuffing box is arranged above the sealing section of the compensation outer tube, the outer tube stuffing box is filled with a V-shaped sealing component, the upper end of the outer tube stuffing box is screwed with a parallel ring, and the lower end of the parallel ring abuts against the V-shaped sealing component to compress the parallel ring. In the oil extraction process, peristaltic motion of the oil pump can not cause sealing failure of the insertion pipe, and the yield and the production stability are improved.

Description

Failure-proof oil extraction device for cannula oil extraction well

Technical Field

The utility model relates to a production string of an oil-water well, in particular to an anti-failure production device of a cannula production well, and belongs to the technical field of production tools.

Background

With the continuous deep development of oil fields and the extension of the exploitation life of oil wells, and the problems of corrosion and scaling accompanied by poor liquid extraction and high water content, casing damage and casing leakage are increased. The subsequent development of the old oil field is severely restricted by the development measures of long leakage breaking sections, multi-section leakage breaking and other complex shaft conditions, water blocking, returning and the like.

The conventional water-blocking oil extraction process technology has the limitations of long leakage breaking sections, multi-section leakage breaking, multi-layer water blocking and downward return development, and particularly the conventional water-blocking oil extraction process of a slim hole well cannot be implemented at all. For example, the operation cost of hanging the small sleeve is high, the construction period is long, and the subsequent construction difficulty is high; the effective period of the clamping of the pump with the packer is short, and the risk of clamping the pipe column is high; the construction period of the ash squeezing and plugging operation is long, the operation cost is high, the risk is high, and the plugging success rate is low.

With the increasing demands of casing damage well, leakage breaking well and later development of oil fields, the pipe-inserted oil extraction technology is widely applied due to lower cost, the total well number and the open well number of the pipe-inserted oil extraction well are continuously increased, and taking Jiangsu oil fields as examples, the number of the newly added pipe-inserted oil extraction wells is about 20 in the current year.

The conventional well intubation oil extraction process mainly comprises a QSC-114 ash squeezing bridge plug, an intubation tube, a bridge plug seat sealing tool, a pump hanging pipe column and the like. The condition that the cannula is not inserted in place, sand and dirt are blocked in the bridge plug and the sealing stability of the cannula is poor often occurs when the cannula oil production well is operated.

In addition, after the intubation succeeds, the intubation tube can also move up and down in the intubation oil extraction bridge plug due to the peristaltic motion of the oil pump in the oil extraction process, and the O-shaped ring sealed by the intubation tube and the bridge plug is worn, so that the tightness of the intubation bridge plug is invalid.

When the oil well needs to be repaired, the bridge plug can be fished out by a special fishing tool, the bridge plug is often fished out to fail or even overhaul due to long well leaving time of the bridge plug or borehole casing change, and the removable cannula oil extraction bridge plug is difficult to mill, so that the measure progress of a subsequent oil well is seriously influenced.

Disclosure of Invention

The utility model aims to overcome the problems in the prior art, and provides an anti-failure oil extraction device for an intubated oil extraction well, wherein the peristaltic motion of an oil pump can not cause the intubated seal failure in the intubated oil extraction process, so that the service life is greatly prolonged, and the yield and the production stability are improved.

In order to solve the technical problems, the utility model provides an anti-failure oil extraction device of an intubation oil extraction well, which comprises a sleeve, wherein a leakage breaking section of the sleeve is positioned above an oil layer, a drillable bridge plug for plugging an inner cavity of the sleeve is arranged below the oil layer, a drillable intubation oil extraction bridge plug is arranged above the oil layer, an intubation tube is inserted into a central tube of the drillable intubation oil extraction bridge plug and is mutually sealed, an overcurrent purifier is arranged above the intubation tube, a telescopic compensator is arranged above the overcurrent purifier, an oil pump is arranged above the telescopic compensator, and the upper part of the oil pump is connected with a tail tube and is supported on the inner wall of the sleeve through a hydraulic anchor; the telescopic compensator comprises a compensation upper joint, a compensation inner pipe, a compensation outer pipe and a compensation lower joint, wherein the upper end of the compensation inner pipe is screwed into the inner thread at the lower end of the compensation upper joint, the compensation outer pipe is sleeved on the periphery of the compensation inner pipe, the inner thread at the lower end of the compensation outer pipe is screwed with the outer thread section at the upper part of the compensation lower joint, the upper end of the compensation outer pipe is provided with a reduced compensation outer pipe sealing section, the inner wall of the compensation outer pipe sealing section is embedded with an outer pipe sealing ring to realize sealing with the compensation inner pipe, an outer pipe stuffing box is arranged above the compensation outer pipe sealing section, a V-shaped sealing assembly is filled in the inner thread at the upper part of the outer pipe stuffing box, and the lower end of the parallel ring is propped against the V-shaped sealing assembly to compress the V-shaped stuffing box.

As an improvement of the utility model, a gap is arranged between the middle section of the compensation inner pipe and the compensation outer pipe, the lower end of the compensation inner pipe is provided with a compensation inner pipe convex ring, the compensation inner pipe convex ring is propped against the inner wall of the compensation outer pipe, the lower port of the compensation inner pipe convex ring is uniformly provided with an inner pipe convex ring lower caulking groove, and the upper port of the compensation lower joint is uniformly provided with a compensation lower joint upper caulking groove which is correspondingly embedded with the inner pipe convex ring lower caulking groove.

As a further improvement of the utility model, the upper end step of the compensation inner pipe convex ring is uniformly provided with inner pipe convex ring caulking grooves, and the lower step of the compensation outer cylinder sealing section is uniformly provided with compensation outer cylinder sealing section lower caulking grooves which are correspondingly embedded with the inner pipe convex ring caulking grooves.

As a further improvement of the utility model, a compensation upper joint sealing ring is embedded above the lower internal thread section of the compensation upper joint, and the upper end of the compensation inner pipe is sealed; and a compensation lower joint sealing ring is embedded above the upper external thread section of the compensation lower joint and is sealed with the lower inner wall of the compensation outer barrel.

As a further improvement of the utility model, the upper end of the parallel ring is provided with a parallel ring flange, and parallel ring grooves are uniformly arranged on the circumference of the parallel ring flange.

As a further improvement of the utility model, the periphery of the lower end of the central tube of the drillable cannula oil extraction bridge plug is connected with a guide shoe in a rotating way, the upper end of the central tube is provided with a central tube convex ring with an expanded diameter, a push ring is arranged below a step of the central tube convex ring, and a setting mechanism is arranged between the push ring and the guide shoe; the periphery of the central tube convex ring is sleeved with a setting push cylinder, the lower end of the setting push cylinder is propped against the upper end face of the push ring, and the upper end of the setting push cylinder is in screwed connection with the periphery of the lower hydraulic cylinder; the inner thread of the central tube convex ring is screwed with a shearing ring, the inner wall of the upper end of the shearing ring is screwed with an adapter, the upper end of the adapter is screwed with a lower mandrel, the outer wall of the upper part of the lower mandrel is sealed with the inner wall of the piston of the lower hydraulic cylinder, the outer periphery of the upper end of the lower mandrel is screwed with an upper mandrel, the outer wall of the lower piston of the upper mandrel is sealed with the lower hydraulic cylinder, a lower hydraulic cavity is arranged between the bottom of the piston of the upper mandrel and the top of the piston of the lower hydraulic cylinder, and the circumference of the upper part of the lower mandrel is provided with a lower mandrel pressure transmission hole which is communicated with the lower hydraulic cavity.

As a further improvement of the utility model, the upper end of the lower hydraulic cylinder is screwed with an upper hydraulic cylinder, the inner wall of the lower end piston of the upper hydraulic cylinder is sealed with the outer wall of the upper mandrel, the upper end of the upper mandrel is screwed in the lower end internal thread of the oil production bridge plug upper joint, the upper periphery of the upper hydraulic cylinder is hung on the middle periphery of the oil production bridge plug upper joint through a pin, an upper hydraulic cavity is arranged between the bottom of the oil production bridge plug upper joint and the top of the piston of the upper hydraulic cylinder, and the upper periphery of the upper mandrel is provided with an upper mandrel pressure transmission hole which is communicated with the upper hydraulic cavity.

As a further improvement of the utility model, the inner wall of the lower mandrel below the pressure transmission hole of the lower mandrel is provided with a conical horn mouth for the steel ball to seat.

Compared with the prior art, the utility model has the following beneficial effects: the vibration that oil-well pump work brought can be absorbed by flexible compensator, and in the production process, tubular column peristalsis can only be transmitted flexible compensator department, and the intubate can be in static sealing state all the time with the center tube of drillable intubate oil recovery bridging plug, and the sealing washer of intubate periphery is difficult to wearing and tearing, realizes the extension of the sealing performance of intubate bridging plug.

The quick-release oil well packer can be used for quick blocking and sealing of large-section leakage or multi-point water outlet of an oil field sleeve, is quite reliable, convenient and quick to set and release, is suitable for oil wells with difficult salvage due to the fact that only a bridge plug is required to be ground off by directly grinding shoes down when the oil well needs to be repaired, at least one pipe column is saved, and the quick-release oil well packer is particularly suitable for oil wells with changeable shaft sleeves and difficult salvage.

Drawings

The utility model will now be described in further detail with reference to the drawings and the detailed description, which are provided for reference and illustration only and are not intended to limit the utility model.

FIG. 1 is a cross-sectional view of a drillable cannulated oil recovery bridge plug according to the present utility model;

FIG. 2 is a cross-sectional view of the expansion compensator of the present utility model;

FIG. 3 is an enlarged view of the compensating inner tube of FIG. 2;

FIG. 4 is an enlarged view of the compensating lower joint of FIG. 2;

fig. 5 is a diagram of the operation of the failure prevention oil recovery apparatus of the cannulated oil recovery well of the present utility model.

In the figure: A. a hydraulic anchor; B. an oil pump; C. a telescopic compensator; D. an overcurrent purifier; E. drilling a cannula oil extraction bridge plug; F. drillable bridge plugs; 1. the oil production bridge plug is connected with the upper joint; 1a, a joint sealing ring is plugged on an oil extraction bridge plug; 2. a hydraulic cylinder is arranged; 2a, an upper hydraulic cylinder piston; 2b, a pressure relief hole of the upper hydraulic cylinder; 3. a pin; 4. an upper mandrel; 4a, a mandrel pressure transmission hole is formed in the upper mandrel; 4b, upper mandrel piston; 5. a lower hydraulic cylinder; 5a, a lower hydraulic cylinder piston; 5b, a lower hydraulic cylinder through hole; 6. a lower core shaft; 6a, a lower mandrel pressure transmission hole; 7. setting a pushing cylinder; 7a, pushing a long groove of the barrel; 8. a conversion joint; 8a, radial holes of the adapter; 9. a shear ring; 10. a central tube; 10a, a central tube convex ring; 11. a push ring; 12. an upper slip; 13. an upper cone; 14. feeding a short rubber cylinder; 15. a long rubber cylinder; 16. a short rubber cylinder is arranged; 17. a lower cone; 18. a lower slip; 19. guiding shoes; 20. a steel ball; 21. compensating the upper joint; 22. compensating an upper joint sealing ring; 23. and (3) ring combining; a v-seal assembly; 25. sealing the spacer ring; 26. a compensating outer cylinder; 27. an outer cylinder sealing ring; 28. compensating the inner tube; 28a, embedding grooves on the inner pipe convex ring; 28b, compensating the inner pipe convex ring; 28c, inserting grooves under the inner pipe convex rings; 29. compensating the lower joint; 29a, compensating an upper caulking groove of the lower joint; 30. compensating the lower joint sealing ring.

Detailed Description

In the following description of the present utility model, the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience in describing the present utility model and simplifying the description, and do not mean that the device must have a specific orientation.

As shown in fig. 1, the periphery of the lower end of a central tube 10 of a drillable cannula oil recovery bridge plug E is connected with a guide shoe 19 in a screwed mode, the upper end of the central tube 10 is provided with a central tube convex ring 10a with an expanded diameter, a push ring 11 is arranged below a step of the central tube convex ring 10a, and a setting mechanism is arranged between the push ring 11 and the guide shoe 19.

The setting mechanism comprises a long rubber cylinder 15 sleeved on the periphery of the central tube 10, two ends of the long rubber cylinder 15 are embedded in a short rubber cylinder, an upper cone 13 is arranged above the upper short rubber cylinder 14, the small end of the upper cone 13 faces upwards and is matched with the inner conical surface of the lower part of the upper slip 12, and the top of the upper slip 12 is propped against the lower part of the push ring 11; a lower cone 17 is arranged below the lower short rubber cylinder 16, the small end of the lower cone 17 faces downwards and is matched with the upper inner cone surface of the lower slips 18, and the bottom of the lower slips 18 is abutted against the top of the guide shoes 19.

The periphery of the central tube convex ring 10a is sleeved with a setting push cylinder 7, the lower end of the setting push cylinder 7 is abutted against the upper end surface of the push ring 11, and the upper end of the setting push cylinder 7 is in screwed connection with the periphery of the lower hydraulic cylinder 5; the internal thread of the central tube convex ring 10a is screwed with a shearing ring 9, the inner wall of the upper end of the shearing ring 9 is screwed with an adapter 8, the lower end of the adapter 8 is closed, the upper end of the adapter 8 is screwed with a lower mandrel 6, the outer wall of the upper part of the lower mandrel 6 is sealed with the inner wall of the piston of the lower hydraulic cylinder 5, the outer periphery of the upper end of the lower mandrel 6 is screwed with an upper mandrel 4, the lower part of the upper mandrel 4 is provided with an upper mandrel piston 4b, the outer wall of the upper mandrel piston 4b is sealed with the lower hydraulic cylinder 5, a lower hydraulic cavity is arranged between the bottom of the piston of the upper mandrel 4 and the top of the piston of the lower hydraulic cylinder 5, and the circumference of the upper part of the lower mandrel 6 is provided with a lower mandrel pressure transmission hole 6a communicated with the lower hydraulic cavity. The central hole of the lower mandrel 6 is smaller, the aperture of the central tube 10 is larger, and the conversion of the size aperture is realized through the conversion connector 8, so that the central tube 10 has larger aperture, is convenient for inserting a cannula and has larger actual diameter.

The circumferential wall of the lower cylinder 5 is integrally connected with the lower cylinder piston 5a at the lower part and slides synchronously. The central tube 10 and the setting mechanism are made of composite materials, and can be directly worn down by a shoe drill without a fishing tool.

The upper end of lower hydraulic cylinder 5 has connect soon and has gone up hydraulic cylinder 2, the lower extreme of going up hydraulic cylinder 2 is equipped with and goes up hydraulic cylinder piston 2a, go up the inner wall of hydraulic cylinder piston 2a and the outer wall of last dabber 4 and realize sealedly, the upper end of going up dabber 4 is connected soon in the lower extreme internal thread of producing bridge plug upper joint 1, the upper portion periphery of going up hydraulic cylinder 2 hangs the middle part periphery at producing bridge plug upper joint 1 through pin 3, be equipped with the hydraulic pressure chamber between the bottom of producing bridge plug upper joint 1 and the top of last hydraulic cylinder piston 2a, the upper portion circumference of going up dabber 4 is equipped with dabber pressure transmission hole 4a and goes up the hydraulic pressure chamber and be linked together. The circumferential wall of the upper hydraulic cylinder 2 is connected with the lower upper hydraulic cylinder piston 2a into a whole and slides synchronously. The upper mandrel 4 is connected with an upper mandrel piston 4b at the lower part of the upper mandrel, and the outer wall of the upper mandrel piston 4b and the lower hydraulic cylinder 5 relatively slide.

The inner wall of the lower mandrel 6 below the lower mandrel pressure transmission hole 6a is provided with a conical horn mouth, when the setting is needed, the steel ball 20 is put into the well mouth, and the steel ball 20 falls onto the conical horn mouth of the lower mandrel 6 to be set, so that the pressure is generated.

The middle circumference of the adapter 8 is provided with an adapter radial hole 8a communicated with the center hole of the adapter 8. The circumference of the middle part of the setting push cylinder 7 is uniformly distributed with a plurality of push cylinder long grooves 7a which are communicated with a cavity between the bottom of the lower hydraulic cylinder 5 and the top of the central tube convex ring 10a. When the pipe column is lowered, the push barrel long groove 7a and the radial hole 8a of the adapter communicate the inside and the outside of the pipe column, so that the pressure balance between the inside and the outside of the pipe column is ensured, the buoyancy is avoided, and the well mouth is not required to be irrigated.

The periphery of the lower sealing section of the oil extraction bridge upper connector 1 is embedded with an oil extraction bridge upper connector sealing ring 1a to be sealed with the inner wall of the upper hydraulic cylinder 2, and the inner wall of the lower end piston of the upper hydraulic cylinder 2 is embedded with an upper hydraulic cylinder sealing ring to be sealed with the outer wall of the upper mandrel 4, so that the upper end and the lower end of the upper hydraulic cavity are sealed.

The lower piston outer wall of the upper mandrel 4 is embedded with an upper mandrel sealing ring and the inner wall of the lower hydraulic cylinder 5 to realize sealing, and the piston inner wall of the lower hydraulic cylinder 5 is embedded with a lower hydraulic cylinder sealing ring and the upper outer wall of the lower mandrel 6 to realize sealing, so that the upper end and the lower end of the lower hydraulic cavity are sealed.

An oil production bridge plug upper joint reducing section is arranged between the upper part of the lower sealing section of the oil production bridge plug upper joint 1 and the pin connection circumference, and an upper hydraulic cylinder pressure relief hole 2b is arranged on the circumference of the upper hydraulic cylinder 2 and is communicated with the upper part of the oil production bridge plug upper joint reducing section. The upper circumference of the lower hydraulic cylinder 5 is provided with a lower hydraulic cylinder through hole 5b which is communicated with the upper cavity of the upper mandrel piston 4b.

In the pipe column descending process, the upper cavity of the upper mandrel piston 4b is communicated with the annulus through the lower hydraulic cylinder through hole 5b, so that pressure holding is prevented. In the setting process, the upper mandrel 4 and the lower mandrel 6 are kept motionless, the upper hydraulic cylinder 2 and the lower hydraulic cylinder 5 slide downwards, the setting mechanism is driven to be set and hung through the setting push cylinder 7, and the heights of the upper hydraulic cavity and the lower hydraulic cavity are gradually increased. After the long rubber cylinder 15 is anchored and the shearing ring 9 is pulled off, the pressure release hole 2b of the upper hydraulic cylinder slides downwards to the position flush with the upper hydraulic cavity, so that the pressure release of the central pore canal above the steel ball 20 is realized, and ground personnel can judge that the setting release is finished.

Because the distance between the lower hydraulic cylinder through hole 5b and the top of the upper mandrel piston 4b is greater than the distance between the upper hydraulic cylinder pressure relief hole 2b and the sealing section of the upper joint of the oil production bridge plug, the lower hydraulic cylinder through hole 5b is always communicated with the cavity above the upper mandrel piston 4b before and after the long rubber cylinder 15 is completely sealed.

As shown in fig. 2 to 4, the telescopic compensator C in the present utility model includes a compensating upper joint 21, a compensating inner tube 28, a compensating outer tube 26 and a compensating lower joint 29, wherein the upper end of the compensating inner tube 28 is screwed into the inner thread at the lower end of the compensating upper joint 21, the compensating outer tube 26 is sleeved on the periphery of the compensating inner tube 28, the inner thread at the lower end of the compensating outer tube 26 is screwed with the upper outer thread section of the compensating lower joint 29, the upper end of the compensating outer tube 26 is provided with a compensating outer tube sealing section with a reduced diameter, the inner wall of the compensating outer tube sealing section is embedded with an outer tube sealing ring 27 to realize sealing with the compensating inner tube 28, an outer tube stuffing box is arranged above the compensating outer tube sealing section, the outer tube stuffing box is filled with a V-shaped sealing assembly 24, a parallel ring 23 is screwed into the inner screw above the outer tube stuffing box, and the lower end of the ring 23 is abutted against the V-shaped sealing assembly 24 to press the same.

The upper compensation joint 21 is fixedly connected with the inner compensation tube 28, and a sealing ring 22 of the upper compensation joint is embedded above the inner thread section of the lower part of the upper compensation joint 21 to realize sealing with the upper end of the inner compensation tube 28. The compensating upper joint 21 is screwed with the upper tail pipe, so that the tail pipe creep caused by the vibration of the oil pump can be transmitted to the compensating inner pipe 28 through the compensating upper joint 21, namely, the compensating inner pipe 28 can follow the upper tail pipe to generate creep.

The compensation outer cylinder 26 is fixedly connected with the compensation lower joint 29, a compensation lower joint sealing ring 30 is embedded above an upper external thread section of the compensation lower joint 29 and is sealed with the inner wall of the lower part of the compensation outer cylinder 26, the lower end of the compensation lower joint 29 is fixedly connected with a cannula, and when the cannula is inserted into the central tube 10 of the drillable cannula oil extraction bridge plug E, a plurality of sealing rings of the cannula outer Zhou Qianzhuang are sealed with the inner wall of the central tube 10.

The compensation outer cylinder 26 and the compensation inner tube 28 are sealed through the outer cylinder sealing ring 27 and the V-shaped sealing component 24, the V-shaped sealing component 24 plays a main sealing role and is divided into two sections with opposite openings, one group of openings on the upper surface are upward, the other group of openings on the lower surface are downward, a sealing spacer ring 25 is arranged between the two groups, and the upper port of the compensation outer cylinder 26 is tightly pressed by the parallel ring 23 on the V-shaped sealing component 24.

The upper end of the union ring 23 is provided with a union ring flange, and the circumference of the union ring flange is uniformly provided with union ring grooves, so that the union ring 23 can be conveniently rotated by a tool.

Although sealing is realized between the compensating outer cylinder 26 and the compensating inner tube 28, when the upper tail tube creeps, the compensating inner tube 28 can axially slide in the compensating outer cylinder 26, so that the creepage is prevented from being transmitted to the compensating outer cylinder 26, the compensating lower joint 29 and the cannula are kept motionless, abrasion caused by sealing rings at the periphery of the cannula is avoided, the cannula and the central tube 10 of the drillable cannula oil extraction bridge plug E are always in a static sealing state, and the sealing performance of the cannula bridge plug is prolonged. The drillable cannula oil extraction bridge plug E cannot fail, the sealing component of the telescopic compensator C has a compensation function after abrasion, and the service life of the cannula bridge plug is greatly prolonged.

A gap is arranged between the middle section of the compensation inner tube 28 and the compensation outer tube 26, a compensation inner tube convex ring 28b is arranged at the lower end of the compensation inner tube 28, the compensation inner tube convex ring 28b is propped against the inner wall of the compensation outer tube 26, the compensation inner tube convex ring 28b slides along the inner wall of the compensation outer tube 26, and coaxial line between the compensation inner tube 28 and the compensation outer tube 26 can be always ensured to avoid shaking when telescopic compensation is carried out.

When the compensating inner tube collar 28b moves down to rest against the upper end of the compensating lower joint 29, the compensating inner tube 28 reaches a lower limit; when the compensation inner pipe convex ring 28b moves downwards to lean against the lower inner step of the compensation outer cylinder sealing section, the compensation inner pipe 28 reaches the upper limit; the upper limit and the lower limit are the compensating free sections.

The lower end opening of the compensating inner pipe convex ring 28b is uniformly provided with inner pipe convex ring lower caulking grooves 28c, and inner pipe convex ring lower tenons are formed between adjacent inner pipe convex ring lower caulking grooves 28c, for example, four inner pipe convex ring lower caulking grooves 28c and four inner pipe convex ring lower tenons with equal width can be arranged. The upper ports of the compensating lower joints 29 are uniformly provided with compensating lower joint upper caulking grooves 29a, and compensating lower joint upper tenons are formed between adjacent compensating lower joint upper caulking grooves 29a. When the compensation lower joint upper tenons are embedded in the inner pipe convex ring lower caulking grooves 28c during well logging, the inner pipe convex ring lower tenons are also embedded in the compensation lower joint upper caulking grooves 29a, the compensation inner pipe 28 is locked radially, the compensation lower joint is prevented from rotating, and when the cannula is inserted into the central pipe 10 of the drillable cannula oil extraction bridge plug E, torque can be transmitted, so that the insertion is convenient.

The upper end steps of the compensation inner pipe convex rings 28b are uniformly provided with inner pipe convex ring embedding grooves 28a, and inner pipe convex ring tenons are formed between adjacent inner pipe convex ring embedding grooves 28 a; the lower steps of the compensating outer cylinder sealing sections are uniformly provided with lower caulking grooves of the compensating outer cylinder sealing sections, and lower tenons of the compensating outer cylinder sealing sections are formed between the lower caulking grooves of the adjacent compensating outer cylinder sealing sections.

When the compensation inner tube 28 is in place and limited, when the lower tenons of the compensation outer tube sealing section are embedded in the embedded grooves 28a of the inner tube convex ring, the tenons of the inner tube convex ring are correspondingly embedded in the lower embedded grooves of the compensation outer tube sealing section to form jaw type combination, so that when other tools or instruments are needed under unexpected conditions in the pit, the compensation inner tube 28 is lifted to be limited upwards, and torque can be transmitted.

As shown in fig. 5, the leakage breaking section of the casing is located above the oil layer, a drillable bridge plug F for plugging the inner cavity of the casing is arranged below the oil layer, a drillable cannula oil extraction bridge plug E is arranged above the oil layer, a cannula is inserted into a central pipe 10 of the drillable cannula oil extraction bridge plug E, an overcurrent purifier D (filter screen) is arranged above the cannula, an oil well pump B is arranged above the overcurrent purifier D, and the upper part of the oil well pump B is connected with a tail pipe and supported on the inner wall of the casing through a hydraulic anchor a. The hydraulic anchor A is selected from KYLM116 hydraulic anchors, and the drillable bridge plug F is selected from QSA drillable bridge plugs.

The operation process is as follows: the method comprises the steps of firstly, setting a drillable bridge plug F below an oil layer and setting the drillable bridge plug.

The drillable intubation oil production bridge plug E is placed above an oil layer by the next pipe column, the drillable intubation oil production bridge plug E is located below a leakage breaking section, a steel ball 20 is put into the pipe column, the steel ball 20 falls to a conical horn mouth of a lower mandrel 6 to be seated, a well mouth is pressed down to shear a pin 3, the pipe column is fixed on a central pipe 10 and a guide shoe 19 through an oil production bridge plug upper joint 1, an upper mandrel 4, a lower mandrel 6, a conversion joint 8 and a shearing ring 9, pressure liquid enters an upper hydraulic cavity through an upper mandrel pressure transmission hole 4a, enters a lower hydraulic cavity through a lower mandrel pressure transmission hole 6a, an upper hydraulic cylinder 2 and a lower hydraulic cylinder 5 push a setting push cylinder 7 to move downwards together, the lower end of the setting push cylinder 7 pushes an upper slip 12 to move downwards along a conical surface of an upper cone 13 through a push ring 11, the lower slip 18 moves upwards relatively along the conical surface of the lower cone 17, meanwhile, the large ends of the upper cone 13 and the lower cone 17 squeeze a short rubber cylinder 15 and a long rubber cylinder 15 from two sides, and the middle section of the long rubber cylinder 15 bulge outwards, and the inner wall of the sleeve is sealed; the teeth of the outer walls of the upper slips 12 and lower slips 18 are anchored to the inner wall of the casing. And then the wellhead pressure is increased, the shear ring 9 is broken, releasing is realized above the shear ring, the central tube 10 and the setting mechanism are left under the well, and the upper joint 1, the upper mandrel 4, the lower mandrel 6, the adapter 8, the shear ring 9, the upper hydraulic cylinder 2, the lower hydraulic cylinder 5 and the setting push cylinder 7 of the oil production bridge plug are pulled out of the wellhead along with the pipe column.

Thirdly, the hydraulic anchor A, the oil pump B, the telescopic compensator C, the overcurrent purifier D and the cannula are connected and run in the well at the well mouth, the lower end of the cannula is inserted from the central tube 10 of the drillable cannula oil extraction bridge plug E, and twelve sealing rings are arranged outside the cannula Zhou Qian and are sealed with the inner wall of the central tube 10. The compensating inner tube 28 of the telescopic compensator C is in a lower limit position, avoiding rotation during the trip.

A pipe column is lifted up for a distance, for example, 400mm, so that the compensation inner pipe convex ring 28b keeps a proper distance with the upper port of the compensation lower joint and the lower step of the compensation outer barrel sealing section, and the telescopic compensator is positioned at the middle free compensation position; and then the wellhead is pressed to enable the hydraulic anchor A to be anchored on the inner wall of the casing in a setting way.

The oil pump B is started for oil extraction, when the oil pump B is produced, the peristaltic motion of the oil pump B can only be transmitted to the telescopic compensator C, the central tube 10 of the cannula and the drillable cannula oil extraction bridge plug E is in a static sealing state, and the service life of the cannula bridge plug is greatly prolonged; after the oil layer is produced, the oil production pipe column is started.

Sixth, a drill pipe is put down to grind the pipe column, the drillable cannula oil extraction bridge plug E, the drillable bridge plug F and the ash surface below are drilled down at one time, and oil extraction of the next oil layer can be directly carried out.

The foregoing description is only of a preferred embodiment of the utility model and is not intended to limit the scope of the utility model. In addition to the embodiments described above, other embodiments of the utility model are possible. All technical schemes formed by equivalent substitution or equivalent transformation fall within the protection scope of the utility model. The technical features of the present utility model that are not described may be implemented by or using the prior art, and are not described herein.

Claims (8)

1. The utility model provides an oil recovery device that prevents inefficacy of intubate oil recovery well, includes the sleeve pipe, and the broken section of leaking of sleeve pipe is located the top of oil reservoir, its characterized in that: the oil layer is provided with a drillable insertion pipe oil extraction bridge plug for plugging the inner cavity of the sleeve, the drillable insertion pipe oil extraction bridge plug is arranged above the oil layer, insertion pipes are inserted into the central pipes of the drillable insertion pipe oil extraction bridge plug and are sealed with each other, an overcurrent purifier is arranged above the insertion pipes, a telescopic compensator is arranged above the overcurrent purifier, an oil pump is arranged above the telescopic compensator, and the upper part of the oil pump is connected with a tail pipe and is supported on the inner wall of the sleeve through a hydraulic anchor; the telescopic compensator comprises a compensation upper joint, a compensation inner pipe, a compensation outer pipe and a compensation lower joint, wherein the upper end of the compensation inner pipe is screwed into the inner thread at the lower end of the compensation upper joint, the compensation outer pipe is sleeved on the periphery of the compensation inner pipe, the inner thread at the lower end of the compensation outer pipe is screwed with the outer thread section at the upper part of the compensation lower joint, the upper end of the compensation outer pipe is provided with a reduced compensation outer pipe sealing section, the inner wall of the compensation outer pipe sealing section is embedded with an outer pipe sealing ring to realize sealing with the compensation inner pipe, an outer pipe stuffing box is arranged above the compensation outer pipe sealing section, a V-shaped sealing assembly is filled in the inner thread at the upper part of the outer pipe stuffing box, and the lower end of the parallel ring is propped against the V-shaped sealing assembly to compress the V-shaped stuffing box.

2. The fail-safe oil recovery apparatus for a cannulated oil recovery well of claim 1, wherein: the middle section of compensation inner tube is equipped with the clearance between the compensation urceolus, the lower extreme of compensation inner tube is equipped with the protruding circle of compensation inner tube, the protruding circle of compensation inner tube supports and leans on the inner wall of compensation urceolus, the lower port of the protruding circle of compensation inner tube evenly is equipped with the protruding round lower caulking groove of inner tube, the upper port of compensation lower clutch evenly is equipped with the compensation lower clutch upper caulking groove that corresponds the gomphosis with the protruding round lower caulking groove of inner tube.

3. The fail-safe oil recovery apparatus for a cannulated oil recovery well of claim 2, wherein: the upper end step of the compensation inner pipe convex ring is uniformly provided with inner pipe convex ring caulking grooves, and the lower step of the compensation outer cylinder sealing section is uniformly provided with compensation outer cylinder sealing section lower caulking grooves which are correspondingly embedded with the inner pipe convex ring caulking grooves.

4. The fail-safe oil recovery apparatus for a cannulated oil recovery well of claim 1, wherein: a compensation upper joint sealing ring is embedded above the lower internal thread section of the compensation upper joint, and sealing is realized with the upper end of the compensation inner pipe; and a compensation lower joint sealing ring is embedded above the upper external thread section of the compensation lower joint and is sealed with the lower inner wall of the compensation outer barrel.

5. The fail-safe oil recovery apparatus for a cannulated oil recovery well of claim 1, wherein: the upper end of the parallel ring is provided with a parallel ring flange, and parallel ring grooves are uniformly formed in the circumference of the parallel ring flange.

6. The fail-safe oil recovery apparatus for a cannulated oil recovery well of claim 1, wherein: the periphery of the lower end of the central tube of the drillable cannula oil extraction bridge plug is connected with a guide shoe in a rotating way, the upper end of the central tube is provided with a central tube convex ring with an expanded diameter, a push ring is arranged below a step of the central tube convex ring, and a setting mechanism is arranged between the push ring and the guide shoe; the periphery of the central tube convex ring is sleeved with a setting push cylinder, the lower end of the setting push cylinder is propped against the upper end face of the push ring, and the upper end of the setting push cylinder is in screwed connection with the periphery of the lower hydraulic cylinder; the inner thread of the central tube convex ring is screwed with a shearing ring, the inner wall of the upper end of the shearing ring is screwed with an adapter, the upper end of the adapter is screwed with a lower mandrel, the outer wall of the upper part of the lower mandrel is sealed with the inner wall of the piston of the lower hydraulic cylinder, the outer periphery of the upper end of the lower mandrel is screwed with an upper mandrel, the outer wall of the lower piston of the upper mandrel is sealed with the lower hydraulic cylinder, a lower hydraulic cavity is arranged between the bottom of the piston of the upper mandrel and the top of the piston of the lower hydraulic cylinder, and the circumference of the upper part of the lower mandrel is provided with a lower mandrel pressure transmission hole which is communicated with the lower hydraulic cavity.

7. The fail-safe oil recovery apparatus for a cannulated oil recovery well of claim 6, wherein: the upper end of lower hydraulic cylinder has connect soon and has gone up the hydraulic cylinder, go up the lower extreme piston inner wall of hydraulic cylinder with go up the outer wall of dabber and realize sealedly, the upper end of going up the dabber connects soon in the lower extreme internal thread of oil recovery bridge stopper top connection, the upper portion periphery of going up the hydraulic cylinder hangs through the pin oil recovery bridge stopper top connection's middle part periphery, oil recovery bridge stopper top connection's bottom with go up being equipped with the hydraulic pressure chamber between the piston top of hydraulic cylinder, the upper portion circumference of going up the dabber is equipped with dabber pressure transmission hole and goes up the hydraulic pressure chamber and is linked together.

8. The fail-safe oil recovery apparatus for a cannulated oil recovery well of claim 6, wherein: and a conical horn mouth for steel ball setting is arranged on the inner wall of the lower mandrel below the lower mandrel pressure transmission hole.

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