CN108457601B - Gas lift oil extraction one-trip well completion pipe string and process - Google Patents
Gas lift oil extraction one-trip well completion pipe string and process Download PDFInfo
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- CN108457601B CN108457601B CN201810313305.6A CN201810313305A CN108457601B CN 108457601 B CN108457601 B CN 108457601B CN 201810313305 A CN201810313305 A CN 201810313305A CN 108457601 B CN108457601 B CN 108457601B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/129—Packers; Plugs with mechanical slips for hooking into the casing
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/14—Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
- E21B43/122—Gas lift
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
- E21B2200/04—Ball valves
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a gas lift oil extraction one-pass well completion pipe column and a process, wherein the well completion pipe column comprises an oil pipe, a running tool, a sealing device d, a packer e, a perforated pipe f and a plug g which are sequentially connected from top to bottom; the completion process comprises the following steps: (1) running a tubular column; (2) packer setting; and (3) packer seal inspection: verifying successful setting of the packer; (4) running tool release; (5) unseating the packer ball seat; (6) gas lift production; according to the current situation of the oil field gas lift oil extraction technology, in order to overcome the problems that the traditional gas lift oil extraction technology needs to be put into two pipe columns, a packer releasing structure has the problems of low-pressure releasing, incapacity of releasing successfully, difficult packer salvage and the like, the developed one-time pipe column is used for completing pipe string pipe column setting, packer checking and sealing, sending tool releasing, packer ball seat breaking and lifting technologies. The technique has the advantages that the releasing structure is safe and reliable, the ball can be thrown for the second time and then released, and the successful completion of the releasing procedure is ensured; the V-shaped packing is adopted for sealing, so that the sealing effect is good, and the pipe column is easy to move; the well-leaving drift diameter is large, and the well-leaving drift diameter can be smoothly put into a tester; the device is suitable for gas-lift oil extraction, gas-lift drainage and gas extraction.
Description
Technical Field
The invention relates to the technical field of oil extraction equipment, in particular to a gas lift oil extraction one-trip well completion pipe column and a process.
Background
The gas lift oil recovery principle is an oil recovery mode that relies on mixing high-pressure gas injected into a well from the surface with oil layer generating fluid in a well bore, and the expansion of the gas is used to reduce the density of the mixed fluid in the well bore, so that crude oil flowing into the well is lifted to the surface.
In field production, the oil is heavy and relatively high pressures can be created in the well bore at thousands of meters or even thousands of meters, preventing the oil in the formation from flowing to the surface. If the gas can be artificially pressed into the well bore, the liquid in the well bore becomes lighter after mixing the gas, and crude oil is easy to spray to the ground.
The traditional gas lift needs to be completed by two times of pipe columns, namely a packer setting pipe column and a gas lift production pipe column. Setting the pipe column in the packer, throwing a ball to press the setting after the setting is completed, reversely buckling or hydraulically releasing the packer, and then inserting the gas lift pipe column into the sealing insertion pipe. The defects are as follows:
1. two pipe columns need to be put in, and manpower and material resources are wasted.
2. The packer releasing structure has the problems of low-pressure releasing and unsuccessful releasing.
3. The packer is difficult to salvage.
Disclosure of Invention
The invention aims at overcoming the defects of the prior art, providing a gas-lift oil extraction one-trip well completion pipe column and a process, and realizing the steps of setting, checking sealing, releasing, ball seat breaking and gas-lift production of a tool.
In order to achieve the above purpose, the present invention mainly provides the following technical solutions:
the invention provides a gas-lift oil extraction one-trip well completion pipe string, which comprises an oil pipe, a running tool, a sealing device, a packer, a perforated pipe and a plug which are sequentially connected from top to bottom, and specifically comprises the following steps:
first, running tool
The running tool comprises an upper joint, a pin, a releasing pin, a hanging pin, a lock sleeve, a first piston, a first ball seat, a supporting ring, a lower joint and an inner joint; the upper joint, the lock sleeve and the lower joint are sequentially connected from top to bottom to form an outer pipe part, and the first ball seat and the inner joint are connected up and down to form an inner pipe part;
the outer tube portion is specifically: the upper end of the upper joint is connected with the oil pipe through threads, a boss is arranged on the outer surface of the lower end of the upper joint, a groove is arranged on the inner surface of the lock sleeve, and the lock sleeve and the upper joint are assembled and positioned through the boss and the groove in a matching way; the lower end of the lock sleeve is connected with the lower connector through threads;
the inner pipe part is specifically: the upper end of the first ball seat is positioned and installed in the upper joint through a contact surface step, and a liquid flow gap is arranged between the first ball seat and the upper joint; the first ball seat penetrates through the outer tube part, and the lower end of the first ball seat is connected with an inner connecting head through threads; a first annular space is formed between the first ball seat and the outer tube, and the first annular space is communicated with the inner cavity of the upper joint through a liquid flow gap; the first piston is installed in the first annular space in a sliding sealing fit manner, the upper part of the first piston is connected with the upper joint through a releasing pin, the lower part of the first piston is connected with a supporting ring through threads, and the supporting ring is supported on the inner surface of the lower end of the upper joint and abuts against a boss on the outer surface of the lower end of the upper joint to press the boss in a groove of the lock sleeve; a limiting groove is formed in the outer wall of the first piston, and a hanging pin matched with the limiting groove is arranged on the upper joint;
when the releasing pin is sheared under pressure, the movable first plug can slide downwards along the first annulus in a sliding sealing fit manner until the hanging pin and the limiting groove realize limiting fit stop; when the oil pipe column is lifted up, the boss at the lower end of the upper joint loses the compaction effect of the supporting ring and is separated from the groove of the lock sleeve, and at the moment, the lock sleeve is separated from the upper joint;
(II) sealing device
The sealing device comprises a sealing cylinder, a sealing inserting rod and a lower variant buckle; wherein the sealing inserted rod is arranged in the sealing cylinder in a sliding sealing fit manner; the upper end of the sealing cylinder is connected with the lower connector through threaded fit, and the lower end of the sealing cylinder is connected with the lower buckle through threaded fit; the upper end of the sealing inserted link is connected with the inner connector through threaded fit;
(III) packer
The packer is a hydraulic packer, and a second ball seat and a steel ball are arranged in the packer.
Further, the packer comprises an outer pipe part, an inner pipe part and a slip mechanism connected between the outer pipe part and the inner pipe part, and the slip mechanism is specifically as follows:
the outer tube part comprises an upper connector, an upper guide ring, a pulling and pressing ring, a setting pin, a lock ring, a sheath, a hydraulic cylinder, a sleeve, a small rubber cylinder, a large rubber cylinder and a spacer ring, and is specifically as follows: the upper end part of the upper connector is connected with the lower variable buckle through threaded fit, the upper guide ring is sleeved outside the upper connector through threaded fit, and the pull ring is positioned at the lower part of the upper guide ring and is sleeved outside the upper connector through a setting pin; the lower end of the sheath is connected with the hydraulic cylinder through threaded fit; the lower end of the hydraulic cylinder is positioned and provided with the sleeve through a step and is in sliding fit with the sleeve; the small rubber cylinder and the large rubber cylinder are sequentially sleeved on the outer part of the sleeve in a sealing manner, and the small rubber cylinder and the large rubber cylinder are tightly pressed by a spacing ring which is connected with the lower end of the sleeve in a threaded fit manner;
the inner tube part comprises an upper central tube, an unsealing pin, a second piston, a third piston, a connecting rod, a lower central tube, a steel ball, a ball seat pin and a ball seat, and is specifically as follows: the upper end of the connecting rod is connected with the upper central tube in a threaded fit manner, and the lower end of the connecting rod is connected with the lower central tube in a threaded fit manner; a second annular space is formed between the sheath and the connecting rod, the second piston is arranged in the second annular space, the inner side and the outer side of the second piston are respectively in sealing fit with the connecting rod and the sheath, and the second piston and the sheath form step positioning fit in the axial direction; a seat hole communicated with the second annular space is arranged on the connecting rod; a third annular space is formed between the hydraulic cylinder and the lower central tube, the third piston is arranged in the third annular space, the inner side and the outer side of the third piston are respectively in sealing fit with the lower central tube and the hydraulic cylinder, and the third piston and the hydraulic cylinder form step positioning fit in the axial direction; a seat hole communicated with the third annulus is formed in the lower central tube; the second ball seat is arranged in the lower end of the lower central tube through the ball seat pin, and the steel ball is thrown into an oil pipe before later setting and falls onto the second ball seat;
the outer wall of the upper end of the upper central tube is provided with a plurality of grooves, and the lower end of the upper connector is provided with a plurality of rods corresponding to the grooves; the middle part of the upper connector and the upper end part of the upper central tube form step positioning fit in the axial direction, the rods are respectively arranged in the corresponding grooves, and the rods and the upper central tube are relatively fixed through unsealing pins; the locking ring is sleeved on the outer side of the upper end of the upper central tube through threaded fit, and the upper end of the locking ring is abutted against the lower end part of the pulling and pressing ring;
the slip mechanism comprises an upper cone, a slip cover, slips, a plate spring and a lower cone, wherein the upper cone is positioned below the spacer ring, the upper end of the upper cone is connected to the lower end of the sleeve through threaded fit, the lower end of the upper cone is sleeved on the outer wall of the lower central tube, and sliding fit can be formed between the upper cone and the lower cone; the upper end of the lower cone is connected with the lower end of the lower central tube through threaded fit, the upper cone and the lower cone are arranged at intervals, and the lower end of the lower cone is connected with a lower joint through threaded fit; the slip cover is erected and installed between the upper cone and the lower cone, an inner groove is formed among the upper cone, the slip cover and the lower cone, and the slips and the plate spring are installed in the inner groove;
further, the sealing insert rod is provided with a sealing structure which is used for being in sliding sealing fit with the sealing cylinder, and the sealing structure comprises an upper sealing gasket ring, a packing and a lower sealing gasket ring which are sequentially sleeved on the outer wall of the sealing insert rod from top to bottom; the sealing structure is tightly pressed by an adjusting ring in threaded connection on a sealing inserted rod at the lower part of the lower sealing gasket ring.
Further, an anti-rotation pin arranged in a radial direction is also connected between the adjusting ring and the sealing inserted link; an anti-rotation pin arranged in a radial direction is also connected between the lock sleeve and the lower connector; an O-shaped sealing ring is further arranged between the ball seat and the internal connection joint.
Further, the upper end of the slip cover and the upper cone are positioned through steps and form sliding fit, the lower end of the slip cover is connected with an inner protective cap through internal threads, and the inner protective cap and the lower cone form step positioning fit.
Furthermore, the lower cone body is sleeved with a lower guide ring through threaded fit, and the lower guide ring and the lower cone body are further connected with radially arranged anti-rotation pins.
The second invention provides a completion process established based on the gas-lift oil extraction one-trip completion pipe string, which comprises the following steps:
(1) And (3) pipe column setting: sequentially connecting a plug, a perforated pipe, a packer, a sealing device, a sending tool and an oil pipe from bottom to top to form a well completion pipe string, and then slowly descending into a well to a designed depth;
(2) Setting a packer:
firstly, pumping liquid into an annulus between a casing and an oil pipe, wherein the liquid enters the interior of the casing through a running tool, a sealing device, an annulus between a packer and the casing respectively, and then sequentially goes through the packer, the sealing device and the running tool to the inner cavity of the oil pipe to be returned until the returned liquid is clean and has no greasy dirt;
secondly, putting steel balls, waiting for the steel balls to fall on the ball seat, pumping liquid into the oil pipe, enabling the liquid to descend to the sealing device through the sending tool, continuing to descend to the inner cavity of the packer, and sealing the rubber cylinder and the sleeve through the hydraulic action to finish setting;
(3) And (3) checking sealing of the packer: verifying successful setting of the packer;
(4) Releasing the running tool: after the completion of setting is confirmed, continuously pumping liquid into the oil pipe, transmitting the liquid pressure to the first piston, allowing the first piston to downwards shear the releasing pin, allowing the first piston to downwards move to the limiting position of the hanging pin, releasing pressure, slowly lifting the oil pipe, at the moment, sequentially driving the upper joint, the first piston, the first ball seat, the inner joint and the sealing insert rod to upwards move, and confirming releasing after lifting a set distance;
(5) The packer ball seat is knocked off: pumping liquid into the oil pipe continuously, enabling the liquid to descend to the sealing device through the sending tool, continuing to descend to the inner cavity of the packer, enabling pressure to act on a sealing surface formed by the steel ball and the second ball seat, shearing the ball seat pin, and enabling the steel ball and the second ball seat to fall above the plug through the inner cavity of the perforated pipe;
(6) And (3) gas lift production: installing a gas lift wellhead and a ground flow according to requirements for production.
Further, the specific process of sealing the rubber sleeve and the sleeve by the hydraulic action in the packer setting step is as follows: the liquid flows out from the sealing hole of the connecting rod and the lower central tube in the inner cavity of the packer, the piston is pushed to drive the sheath and the hydraulic cylinder to move downwards, the sheath simultaneously drives the pulling ring to move downwards, the sealing pin is sheared, the locking ring simultaneously moves downwards along the upper central tube in a one-way buckling mode, the hydraulic cylinder moves downwards to compress the small rubber cylinder and the large rubber cylinder to expand, the upper cone is pushed to squeeze the slips, and the slips clamp the inner wall of the sleeve under the pushing force; the liquid pressure and settling time were operated as follows: 0-4 MPa, 5-8 MPa, 5-11 MPa, 5-14 MPa and 5-5 min to complete setting.
Further, the specific steps of the packer checking method comprise the following two modes:
pumping liquid into an annulus between the casing and the oil pipe, wherein the liquid pressure acts on sealing surfaces of the small rubber cylinder, the large rubber cylinder and the casing through the annulus between the sending tool, the sealing device and the packer and the casing respectively, and after the liquid pressure rises to 10MPa for 5min, the pressure drop is not more than 0.5MPa, so that the packer is successfully set;
and secondly, the lifting oil pipe column exceeds the original suspended weight by 2 tons or is pressed down by 10 tons, and setting is successful without sliding.
Further, in the step of releasing the running tool, the tonnage is lifted by 3t, not more than 5t, and 1.5m is lifted, namely the releasing is confirmed,
compared with the prior art, the invention has the following advantages:
1. one trip of pipe column is used for completing tool running, setting, seal checking, releasing, ball seat breaking and gas lift production.
2. The releasing structure is safe and reliable, and the releasing structure can be used for secondary ball throwing and releasing, namely if the well completion process step (4) is not successfully performed, the step (5) is automatically performed under abnormal pressure, at the moment, the ball throwing is required to be performed through the oil pipe b, the ball falls on the ball seat of the feeding tool, and then the operation of the well completion process step (4) is performed, and the secondary ball throwing and releasing can ensure that the releasing process is successfully completed.
3. The packer can be lifted and unsealed by adding tonnage, so that the risk of abnormal well retention of tools is avoided. If the implementation of the well completion process step is abnormal, the plug g, the perforated pipe f, the packer e, the sealing device d, the running tool c and the oil pipe b can be lifted out of the well only by 10 tons except the suspended weight of the pipe column, and the condition that the tool is fished out of the spear after the abnormality of the tool well completion process is avoided.
4. The packing type seal is adopted, so that the sealing effect is good, and the pipe column is easy to move.
5. The diameter of the reserved well is large, and the later operation can be smoothly carried out.
Drawings
FIG. 1 is a diagram of the operational state of a gas lift production one-pass completion string;
FIG. 2 is a schematic illustration of the construction of a running tool;
FIG. 3 is a schematic structural view of a sealing device;
FIG. 4 is a schematic diagram of the upper half of the packer;
FIG. 5 is a schematic view of the lower half of the packer;
in fig. 1: casing a, tubing b, running tool c, sealing device d, packer e, perforated pipe f and plug g;
in fig. 2: 1. the hydraulic bolt comprises an upper joint, a pin, a releasing pin, a hanging pin, a lock sleeve, a first piston, a first ball seat, a supporting ring, an anti-rotation pin, a lower joint, an inner joint and a 12O-shaped ring, wherein the upper joint, the pin, the releasing pin, the hanging pin, the lock sleeve and the first piston are arranged in sequence, the first ball seat is arranged in sequence, the supporting ring is arranged in sequence, the anti-rotation pin is arranged in sequence, and the lower joint is arranged in sequence, the inner joint is arranged in sequence, and the O-shaped ring is arranged in sequence.
In fig. 3: 13. the sealing cylinder comprises a sealing cylinder body, a sealing inserted rod, an upper sealing gasket ring, a packing, a lower sealing gasket ring, an adjusting ring and an anti-rotation pin, wherein the sealing cylinder body comprises a sealing inserted rod, an upper sealing gasket ring, a packing, a lower sealing gasket ring, a sealing gasket ring, an adjusting ring, an anti-rotation pin and a lower buckling.
In fig. 4 and 5: 21. the hydraulic joint comprises an upper connector, 22, an upper guide ring, 23, a pull ring, 24, a setting pin, 25, a lock ring, 26, a sheath, 27, a deblocking pin, 28, an upper central tube, 291, a second piston, 292, a third piston, 30, a connecting rod, 31, a hydraulic cylinder, 32, a lower central tube, 33, a sleeve, 34, a small rubber cylinder, 35, a large rubber cylinder, 36, a spacer ring, 37, an upper cone, 38, a slip cover, 39, slips, 40, a leaf spring, 41, a steel ball, 42, a ball seat pin, 43, a second ball seat, 44, an inner protective cap, 45, a lower cone, 46, an anti-rotation pin, 47, a lower guide ring and 48, and a lower joint.
Detailed Description
In order to further describe the technical means and effects adopted by the invention to achieve the preset aim, the following detailed description refers to the specific implementation, structure, characteristics and effects of the gas lift oil extraction one-pass completion string, the process and the working method thereof according to the invention by combining the accompanying drawings and the preferred embodiment. In the following description, different "an embodiment" or "an embodiment" do not necessarily refer to the same embodiment. Furthermore, the particular features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.
Example 1
Referring to fig. 1-5, a gas lift oil extraction one-trip completion pipe string comprises an oil pipe b, a running tool c, a sealing device d, a packer e, a perforated pipe f and a plug g which are sequentially connected from top to bottom, wherein the gas lift oil extraction one-trip completion pipe string comprises the following concrete steps:
first, running tool
The running tool comprises an upper joint 1, a pin 2, a releasing pin 3, a hanging pin 4, a lock sleeve 5, a first piston 6, a first ball seat 7, a supporting ring 8, a lower joint 10 and an inner joint 11; wherein the upper joint 1, the lock sleeve 5 and the lower joint 10 are sequentially connected from top to bottom to form an outer pipe part, and the first ball seat 7 and the inner joint 11 are sequentially connected from top to bottom to form an inner pipe part.
The outer tube part is specifically: the upper end of the upper joint 1 is connected with an oil pipe b through threads, a boss is arranged on the outer surface of the lower end of the upper joint 1, a groove is arranged on the inner surface of the lock sleeve 5, and the lock sleeve 5 and the upper joint 1 are assembled and positioned through the boss and the groove; the lower end of the lock sleeve 5 is connected with a lower connector 10 through threads; the pin 2 is used for plugging a pin hole of the lock sleeve 5.
The inner pipe part is specifically: the upper end of the first ball seat 7 is positioned and installed in the upper joint 1 by a contact surface step, and a liquid flow gap is arranged between the first ball seat 7 and the upper joint 1; the first ball seat 7 penetrates through the outer tube part and the lower end is connected with the inner connector 11 through threads; a first annular space is formed between the first ball seat 7 and the outer tube, and the first annular space is communicated with the inner cavity of the upper joint 1 through a liquid flow gap; the first piston 6 is installed in the first annular space in a sliding sealing fit manner, the upper part of the first piston 6 is connected with the upper joint 1 through the releasing pin 3, the lower part of the first piston 6 is connected with the supporting ring 8 through threads, and the supporting ring 8 is supported on the inner surface of the lower end of the upper joint 1 and abuts against a boss on the outer surface of the lower end of the upper joint 1 to tightly press the boss in a groove of the lock sleeve 5; the outer wall of the first piston 6 is provided with a limit groove, and the upper joint 1 is provided with a hanging pin 4 matched with the limit groove.
When the releasing pin 3 is sheared under pressure, the first piston 6 can slide downwards along the first annular space in a sliding sealing fit manner until the hanging pin 4 and the limiting groove realize limiting fit stop; when the oil pipe column is lifted up, the boss at the lower end of the upper joint 1 loses the compaction effect of the supporting ring 8 and is separated from the groove of the lock sleeve 5, and at the moment, the lock sleeve 5 is separated from the upper joint 1.
(II) sealing device
The sealing device comprises a sealing cylinder 13, a sealing inserted link 14 and a lower variant buckle 20; wherein the sealing insert rod 14 is mounted inside the sealing cylinder 13 through sliding sealing fit; the upper end of the sealing cylinder 13 is connected with the lower connector 10 through screw thread fit, and the lower end of the sealing cylinder 13 is connected with the lower button 20 through screw thread fit; the upper end of the sealing plug rod 14 is connected with the inner connector 11 through threaded fit; the sealing insert rod 14 is provided with a sealing structure which is in sliding sealing fit with the sealing cylinder 13, and the sealing structure comprises an upper sealing gasket ring 15, a packing 16 and a lower sealing gasket ring 17 which are sleeved on the outer wall of the sealing insert rod 14 from top to bottom in sequence; the sealing structure is tightly pressed by an adjusting ring 18 which is connected with the sealing inserted rod 14 in a threaded way at the lower part of the lower sealing gasket ring 17; also connected between the adjusting ring 18 and the sealing insert 14 are radially arranged anti-rotation pins 19.
(III) packer
The packer is a hydraulic packer and comprises an outer pipe part, an inner pipe part and a slip mechanism connected between the outer pipe part and the inner pipe part, and the slip mechanism is specifically as follows:
the outer tube part comprises an upper connector 21, an upper guide ring 22, a pulling and pressing ring 23, a setting pin 24, a locking ring 25, a sheath 26, a hydraulic cylinder 31, a sleeve 33, a small rubber cylinder 34, a large rubber cylinder 35 and a spacing ring 36, and is specifically as follows: the upper end part of the upper connector 21 is connected with the lower variable buckle 20 through threaded fit, the upper guide ring 22 is sleeved outside the upper connector 21 through threaded fit, and the pull ring 23 is positioned at the lower part of the upper guide ring 22 and is sleeved outside the upper connector 21 through a setting pin 24; the lower end of the sheath 26 is connected with the lower end of the tension ring 23 through screw thread fit, and the lower end of the sheath 26 is connected with the hydraulic cylinder 31 through screw thread fit; the lower end of the hydraulic cylinder 31 is positioned and provided with a sleeve 33 through a step and forms sliding fit with the sleeve; the small rubber cylinder 34 and the large rubber cylinder 35 are sequentially sleeved on the outer part of the sleeve 33 in a sealing manner, and the small rubber cylinder 34 and the large rubber cylinder 35 are compressed by a spacing ring 36 which is connected with the lower end of the sleeve 33 in a threaded fit manner;
the inner tube portion includes an upper center tube 28, a unsealing pin 27, a second piston 291, a third piston 292, a connecting rod 30, a lower center tube 32, a steel ball 41, a ball seat pin 42, and a ball seat 43, as follows: the upper end of the connecting rod 30 is connected with the upper central tube 28 through screw thread fit, and the lower end is connected with the lower central tube 32 through screw thread fit; a second annular space is formed between the sheath 26 and the connecting rod 30, a second piston 291 is arranged in the second annular space, the inner side and the outer side of the second piston 291 are respectively in sealing fit with the connecting rod 30 and the sheath 26, and the second piston 291 and the sheath 26 are in step positioning fit in the axial direction; the connecting rod 30 is provided with a seat hole communicated with the second annular space; a third annulus is formed between the hydraulic cylinder 31 and the lower central tube 32, a third piston 292 is arranged in the third annulus, the inner side and the outer side of the third piston 292 are respectively in sealing fit with the lower central tube 32 and the hydraulic cylinder 31, and the third piston 292 and the hydraulic cylinder 31 are in step positioning fit in the axial direction; the lower center tube 32 is provided with a seat hole communicated with the third annulus; a second ball seat 43 is arranged in the lower end of the lower central tube 32 through a ball seat pin 42, and the steel ball 41 falls on the second ball seat 43 after being put into the oil pipe b before later setting;
the outer wall of the upper end of the upper central tube 28 is provided with a plurality of grooves, and the lower end of the upper connector 21 is provided with a plurality of rods corresponding to the grooves; the middle part of the upper connector 21 and the upper end part of the upper central tube 28 form step positioning fit in the axial direction, rods are respectively arranged in corresponding grooves, and the rods and the upper central tube 28 are relatively fixed through unsealing pins 27; the lock ring 25 is sleeved outside the upper end of the upper central tube 28 through threaded fit, and the upper end of the lock ring 25 abuts against the lower end of the pull compression ring 23.
The slip mechanism comprises an upper cone 37, a slip cover 38, a slip 39, a plate spring 40 and a lower cone 45, wherein the upper cone 37 is positioned below the spacer ring 36, the upper end of the upper cone is connected to the lower end of the sleeve 33 through threaded fit, and the lower end of the upper cone 37 is sleeved on the outer wall of the lower central tube 32 and can form sliding fit; the upper end of the lower cone 45 is connected with the lower end of the lower central tube 32 through screw thread fit, the upper cone 37 and the lower cone 45 are arranged at intervals, and the lower end of the lower cone 45 is connected with a lower joint 48 through screw thread fit; the slip cover 38 is erected and installed between the upper cone 37 and the lower cone 45, an inner groove is formed among the upper cone 37, the slip cover 38 and the lower cone 45, and the slips 39 and the plate springs 40 are installed in the inner groove; the upper end of the slip cover 38 and the upper cone 37 are positioned by steps and form sliding fit, the lower end of the slip cover 38 is connected with the inner protective cap 44 by internal threads, and the inner protective cap 44 and the lower cone 45 form step positioning fit; the lower cone 45 is sleeved with a lower guide ring 47 through screw thread fit, and the lower guide ring 47 and the lower cone 45 are also connected with radially arranged anti-rotation pins 46.
Example 2
Referring to fig. 1-5, the completion process of the gas lift oil recovery one-pass completion string of example 1 comprises the steps of:
1) Lower pipe column
And (3) connecting from bottom to top: the plug g+the perforated pipe f+the packer e+the sealing device d+the feeding tool c+the oil pipe b slowly descends to the designed depth.
2) Packer setting
Pumping liquid into the annular space between the casing a and the oil pipe b, respectively carrying out the inside of the annular space between the running tool c, the sealing device d and the casing a by the holes on the perforated pipe f, sequentially returning the liquid from the running tool c to the inner cavity of the casing b through the sealing device d and the packer e until the returned liquid is clean and free of greasy dirt, putting steel balls 41, and waiting the steel balls to fall on the second ball seat 43; pumping liquid into the oil pipe b by using small displacement, enabling the liquid pressure to descend to a sealing device d through a feeding tool c, continuing to descend to the inner cavity of a packer e, enabling the liquid pressure to flow out through a sealing hole of a connecting rod 30 and a lower central pipe 32, pushing a piston (a second piston 291 and a third piston 292) to descend with a sheath 26 and a hydraulic cylinder 31, driving a pulling-pressing ring 23 to descend through the sheath 26 at the moment, shearing a setting pin 24, enabling a lock ring 25 to descend along an upper central pipe 28 in a one-way buckling mode, enabling the hydraulic cylinder 31 to descend to compress a small rubber cylinder 34 and a large rubber cylinder 35, pushing an upper cone 37 to squeeze a slip 39, enabling the slip 39 to clamp the inner wall of the sleeve under the pushing force, and enabling the liquid pressure and the stabilizing time to operate according to the following procedures: setting was completed from 0 to 4MPa (5 min of pressure stabilization), 8MPa (5 min of pressure stabilization), 11MPa (5 min of pressure stabilization), and 14MPa (5 min of pressure stabilization).
3) And (3) checking sealing of the packer:
pumping liquid into the annular space between the sleeve a and the oil pipe b, and acting on the sealing surfaces of the small rubber cylinder 34, the large rubber cylinder 35 and the sleeve a respectively through the annular space between the feeding tool c, the sealing device d and the packer e and the sleeve a, wherein after the liquid pressure is increased to 10MPa and 5min, the pressure drop is not more than 0.5MPa, so that the packer is successfully set; or the lifting oil pipe column exceeds the original suspended weight by 2 tons or is pressed down by 10 tons, and setting is successful without sliding.
4) Releasing the running tool:
after the completion of setting is confirmed, liquid is continuously pumped into the oil pipe b until the liquid pressure is increased to 19MPa, the liquid pressure is transmitted to the first piston 6 through a liquid flow gap between the first ball seat 7 and the upper joint 1, the first piston 6 is downwards sheared off the releasing pin 3, the first piston 6 is continuously downwards moved to the limit position of the hanging pin 4, the pressure is released, the oil pipe b is slowly lifted, at the moment, the oil pipe b sequentially drives the upper joint 1, the first piston 6, the first ball seat 7, the inner joint 11, the sealing insert rod 14, the upper sealing gasket ring 15, the packing 16, the lower sealing gasket ring 17 and the adjusting ring 18 to upwards lift the tonnage 3t except the hanging weight of a pipe column to be not more than 5t, and the lifting is 1.5m, so that releasing is confirmed. The release is to separate the pipe string, so that the pipe string can be directly pulled out when the production pipe string is pulled out, if the production pipe string is released after a period of time, the release is likely to fail because oil dirt in the well is attached to the sealing surface of the ball seat, and the production pipe string cannot be pulled out of the well.
5) And (5) the ball seat of the packer is knocked off:
liquid is pumped into the oil pipe b, the liquid pressure descends to the sealing device d through the sending tool c and continues to descend to the inner cavity of the packer e, the pressure acts on the sealing surface formed by the steel ball 41 and the second ball seat 43, the ball seat pin 42 is sheared off, and the steel ball 41 and the second ball seat 43 drop to be above the plug g through the inner cavity of the perforated pipe f.
6) And (3) gas lift production:
installing a gas lift wellhead and a ground flow according to requirements for production.
Example 3
A completion process of a gas lift oil recovery one-pass completion string, the process steps being substantially identical to those of example 2, when completion process step 4) fails, step 5) has been automatically performed by abnormal pressure, i.e. the running tool has not been released and the second ball seat 43 and ball 41 have been knocked out; in this case, a second ball injection can be performed through the oil pipe b, the ball falls on the first ball seat 7 of the running tool, and then the operation of the completion process step 4) is performed, namely, a second release is performed; the secondary ball throwing and releasing can ensure that the releasing procedure is successfully completed.
It will be readily appreciated by those skilled in the art that the foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (7)
1. The utility model provides a gas lift oil recovery one time completion tubular column which characterized in that, including oil pipe (b), running tool (c), sealing device (d), packer (e), perforating pipe (f) and plug (g) that top-down connects gradually, concretely as follows:
first, running tool
The feeding tool comprises an upper joint (1), a pin (2), a releasing pin (3), a hanging pin (4), a lock sleeve (5), a first piston (6), a first ball seat (7), a supporting ring (8), a first rotation-preventing pin (9), a lower joint (10), an inner joint (11) and an O-shaped sealing ring (12); the upper joint (1), the lock sleeve (5) and the lower joint (10) are sequentially connected from top to bottom to form an outer pipe part, and the first ball seat (7) and the inner joint (11) are connected up and down to form an inner pipe part;
the outer tube portion is specifically: the upper end of the upper joint (1) is connected with the oil pipe (b) through threads, a boss is arranged on the outer surface of the lower end of the upper joint (1), a groove is arranged on the inner surface of the lock sleeve (5), and the lock sleeve (5) and the upper joint (1) are assembled and positioned through the boss and the groove in a matching way; the lower end of the lock sleeve (5) is connected with a lower connector (10) through threads;
the inner pipe part is specifically: the upper end of the first ball seat (7) is positioned and installed in the upper joint (1) by a contact surface step, and a liquid flow gap is arranged between the first ball seat (7) and the upper joint (1); the first ball seat (7) penetrates through the outer tube part, and the lower end of the first ball seat is connected with an inner connecting head (11) through threads; a first annular space is formed between the first ball seat (7) and the outer tube, and the first annular space is communicated with the inner cavity of the upper joint (1) through a liquid flow gap; the first annular inner sliding seal is matched with the first piston (6), the upper part of the first piston (6) is connected with the upper joint (1) through a releasing pin (3), the lower part of the first piston (6) is connected with a supporting ring (8) through threads, and the supporting ring (8) is supported on the inner surface of the lower end of the upper joint (1) and abuts against a boss on the outer surface of the lower end of the upper joint (1) to compress the boss in a groove of the lock sleeve (5); a limiting groove is formed in the outer wall of the first piston (6), and a hanging pin (4) matched with the limiting groove is arranged on the upper joint (1);
when the releasing pin (3) is pressed and sheared, the first piston (6) can slide downwards along the first annular space in a sliding sealing fit manner until the hanging pin (4) and the limiting groove realize limiting fit stop; when the oil pipe column is lifted up, a boss at the lower end of the upper connector (1) loses the compaction effect of the supporting ring (8) and is separated from a groove of the lock sleeve (5), and at the moment, the lock sleeve (5) is separated from the upper connector (1);
(II) sealing device
The sealing device comprises a sealing cylinder (13), a sealing inserting rod (14) and a lower variant buckle (20); wherein the sealing insert rod (14) is arranged inside the sealing cylinder (13) in a sliding sealing fit manner; the upper end of the sealing cylinder (13) is connected with the lower connector (10) through threaded fit, and the lower end of the sealing cylinder (13) is connected with the lower buckle (20) through threaded fit; the upper end of the sealing inserted rod (14) is connected with the inner connector (11) through threaded fit;
(III) packer
The packer is a hydraulic packer, and a second ball seat (43) and a steel ball (41) are arranged in the packer;
the packer comprises an outer pipe part, an inner pipe part and a slip mechanism connected between the outer pipe part and the inner pipe part, and the slip mechanism is specifically as follows:
the outer tube part comprises an upper connector (21), an upper guide ring (22), a pull ring (23), a setting pin (24), a lock ring (25), a sheath (26), a hydraulic cylinder (31), a sleeve (33), a small rubber cylinder (34), a large rubber cylinder (35) and a spacer ring (36), and is specifically as follows: the upper end part of the upper connector (21) is connected with the lower variable buckle (20) through threaded fit, the upper guide ring (22) is sleeved outside the upper connector (21) through threaded fit, and the pull ring (23) is positioned at the lower part of the upper guide ring (22) and is sleeved outside the upper connector (21) through a setting pin (24); the sheath (26) is connected with the lower end of the pulling and pressing ring (23) through threaded fit, and the lower end of the sheath (26) is connected with the hydraulic cylinder (31) through threaded fit; the lower end of the hydraulic cylinder (31) is provided with the sleeve (33) in a positioning way through a step and is in sliding fit with the sleeve; the small rubber cylinder (34) and the large rubber cylinder (35) are sequentially sleeved on the outer part of the sleeve (33) in a sealing manner, and the small rubber cylinder (34) and the large rubber cylinder (35) are tightly pressed by a spacing ring (36) which is connected with the lower end of the sleeve (33) in a threaded fit manner;
the inner tube part comprises an upper central tube (28), a deblocking pin (27), a second piston (291), a third piston (292), a connecting rod (30), a lower central tube (32), a steel ball (41), a ball seat pin (42) and a second ball seat (43), and is specifically as follows: the upper end of the connecting rod (30) is connected with the upper central tube (28) through screw thread fit, and the lower end of the connecting rod is connected with the lower central tube (32) through screw thread fit; a second annular space is formed between the sheath (26) and the connecting rod (30), the second piston (291) is arranged in the second annular space, the inner side and the outer side of the second piston are respectively in sealing fit with the connecting rod (30) and the sheath (26), and the second piston (291) and the sheath (26) form step positioning fit in the axial direction; a seat hole communicated with the second annulus is arranged on the connecting rod (30); a third annular space is formed between the hydraulic cylinder (31) and the lower central tube (32), the third piston (292) is arranged in the third annular space, the inner side and the outer side of the third piston are respectively in sealing fit with the lower central tube (32) and the hydraulic cylinder (31), and the third piston (292) and the hydraulic cylinder (31) form step positioning fit in the axial direction; a seat hole communicated with the third annulus is arranged on the lower central tube (32); the second ball seat (43) is arranged in the lower end of the lower central pipe (32) through the ball seat pin (42), and the steel ball (41) falls onto the second ball seat (43) in an oil pipe (b) before later setting;
the outer wall of the upper end of the upper central tube (28) is provided with a plurality of grooves, and the lower end of the upper connector (21) is provided with a plurality of rods corresponding to the grooves; the middle part of the upper connector (21) and the upper end part of the upper central tube (28) form step positioning fit in the axial direction, the rods are respectively arranged in the corresponding grooves, and the rods and the upper central tube (28) are relatively fixed through the unsealing pin (27); the locking ring (25) is sleeved outside the upper end of the upper central tube (28) through threaded fit, and the upper end of the locking ring (25) abuts against the lower end of the pulling and pressing ring (23);
the slip mechanism comprises an upper cone (37), a slip cover (38), slips (39), a plate spring (40) and a lower cone (45), wherein the upper cone (37) is positioned below the spacer ring (36) and the upper end of the upper cone is connected to the lower end of the sleeve (33) through threaded fit, and the lower end of the upper cone (37) is sleeved on the outer wall of the lower central tube (32) and can form sliding fit; the upper end of the lower cone (45) is connected with the lower end of the lower central tube (32) through threaded fit, the upper cone (37) and the lower cone (45) are arranged at intervals, and the lower end of the lower cone (45) is connected with a lower joint (48) through left-handed threaded fit; the slip cover (38) is arranged between the upper cone (37) and the lower cone (45) in a erection mode, an inner groove is formed among the upper cone (37), the slip cover (38) and the lower cone (45), and the slips (39) and the plate springs (40) are arranged in the inner groove;
the sealing insert rod (14) is provided with a sealing structure which is used for being matched with the sealing cylinder (13) in a sliding sealing way, and the sealing structure comprises an upper sealing gasket ring (15), a packing (16) and a lower sealing gasket ring (17) which are sleeved on the outer wall of the sealing insert rod (14) in sequence from top to bottom; the sealing structure is tightly pressed by an adjusting ring (18) which is connected with the sealing inserting rod (14) at the lower part of the lower sealing gasket ring (17) in a threaded manner.
2. A gas lift production one-pass completion string according to claim 1, characterized in that a radially arranged second anti-rotation pin (19) is also connected between the adjusting ring (18) and the sealing spigot (14); a first anti-rotation pin (9) which is radially arranged is also connected between the lock sleeve (5) and the lower connector (10); an O-shaped sealing ring (12) is further arranged between the first ball seat (7) and the inner connector (11).
3. The gas lift oil recovery one-trip completion string according to claim 1, wherein an upper end of the slip cap (38) and the upper cone (37) are positioned by steps and form a sliding fit therebetween, a lower end of the slip cap (38) is connected with an inner protective cap (44) by internal threads, and a step positioning fit is formed between the inner protective cap (44) and the lower cone (45).
4. The gas lift oil recovery one-trip completion string according to claim 1, wherein the lower cone (45) is sleeved with a lower guide ring (47) through screw thread fit, and the lower guide ring (47) and the lower cone (45) are further connected with a third rotation preventing pin (46) which is radially arranged.
5. A completion process established based on the gas lift oil recovery one-pass completion string of any one of claims 1-4, comprising the steps of:
(1) And (3) lower pipe column: sequentially connecting a plug (g), a perforated pipe (f), a packer (e), a sealing device (d), a running tool (c) and an oil pipe (b) from bottom to top to form a well completion pipe string, and then slowly running into a well to a designed depth;
(2) Setting a packer:
firstly, pumping liquid into an annulus between a casing (a) and an oil pipe (b), wherein the liquid passes through an annular space between a running tool (c), a sealing device (d), a packer (e) and the casing (a) respectively, then enters the inside of the annular space through a hole on a perforated pipe (f), and then sequentially passes through the packer (e), the sealing device (d) and the running tool (c) to the inner cavity of the oil pipe (b) to be returned until the returned liquid is clean and free of greasy dirt;
secondly, putting steel balls (41), waiting for the steel balls (41) to fall onto a second ball seat (43), pumping liquid into an oil pipe (b), enabling the liquid to descend to a sealing device (d) through a delivery tool (c), continuing to descend to an inner cavity of a packer (e), and sealing a rubber cylinder with a sleeve (a) through hydraulic action to finish setting;
(3) And (3) checking sealing of the packer: verifying successful setting of the packer;
(4) Releasing the running tool: after the completion of setting is confirmed, continuously pumping liquid into the oil pipe (b), transmitting the liquid pressure to the first piston (6), cutting off the releasing pin (3) by the first piston (6) in a descending way, continuously descending to the limit position of the hanging pin (4) by the first piston (6), releasing pressure, slowly lifting the oil pipe (b), at the moment, sequentially driving the upper joint (1), the first piston (6), the first ball seat (7), the inner joint (11) and the sealing inserted rod (14) by the oil pipe (b), and confirming releasing after lifting a set distance;
(5) And (5) the ball seat of the packer is knocked off: continuously pumping liquid into the oil pipe (b), enabling the liquid to descend to the sealing device (d) through the feeding tool (c), continuously descending to the inner cavity of the packer (e), enabling pressure to act on a sealing surface formed by the steel ball (41) and the second ball seat (43), shearing the ball seat pin (42), and enabling the steel ball (41) and the second ball seat (43) to drop above the plug (g) through the inner cavity of the perforated pipe (f);
(6) And (3) gas lift production: installing a gas lift wellhead and a ground flow according to requirements for production.
6. The well completion process of claim 5, wherein the hydraulic action in the packer setting step is performed by: the liquid flows out from the sealing holes of the connecting rod (30) and the lower central tube (32) in the inner cavity of the packer (e), the piston (29) is pushed to drive the sheath (26) and the hydraulic cylinder (31) to descend, the sheath (26) simultaneously drives the pull ring (23) to descend, the setting pin (24) is sheared, the lock ring (25) simultaneously descends along the upper central tube (28) in a one-way buckling manner, the hydraulic cylinder (31) downwards compresses the small rubber cylinder (34) and the large rubber cylinder (35) to expand, the upper cone (37) is pushed to squeeze the slips (39), and the slips (39) clamp the inner wall of the sleeve (a) under the thrust; the liquid pressure and settling time were operated as follows: 0-4 MPa, 5-8 MPa, 5-11 MPa, 5-14 MPa and 5-5 min to complete setting.
7. The completion process of claim 6, wherein the specific step of packer verification comprises two steps:
firstly, pumping liquid into an annulus between a casing (a) and an oil pipe (b), wherein the liquid pressure acts on sealing surfaces of a small rubber cylinder (34), a large rubber cylinder (35) and the casing (a) through an annulus between a sending tool (c), a sealing device (d) and a packer (e) and the casing (a), and after the liquid pressure rises to 10MPa and 5min, the pressure drops to not more than 0.5MPa, so that the packer is successfully set;
and secondly, lifting the pipe column of the oil pipe (b) to exceed the original suspended weight by 2 tons or pressing the pipe column by 10 tons, and setting successfully without sliding.
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| CN201810313305.6A CN108457601B (en) | 2018-04-10 | 2018-04-10 | Gas lift oil extraction one-trip well completion pipe string and process |
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| CN201810313305.6A CN108457601B (en) | 2018-04-10 | 2018-04-10 | Gas lift oil extraction one-trip well completion pipe string and process |
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| CN116624130B (en) * | 2023-07-21 | 2023-09-22 | 中海油能源发展股份有限公司采油服务分公司 | Gas lift plunger |
| CN117433916B (en) * | 2023-12-20 | 2024-02-23 | 中国石油集团渤海钻探工程有限公司 | Air energy storage well is with annotating and producing packer testing arrangement |
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