CN111980610A - CO2Water alternate injection well completion pipe string, water alternate injection well completion method and water alternate injection well service pipe string - Google Patents
CO2Water alternate injection well completion pipe string, water alternate injection well completion method and water alternate injection well service pipe string Download PDFInfo
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- CN111980610A CN111980610A CN202010653122.6A CN202010653122A CN111980610A CN 111980610 A CN111980610 A CN 111980610A CN 202010653122 A CN202010653122 A CN 202010653122A CN 111980610 A CN111980610 A CN 111980610A
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- locking
- sealing
- pipe
- casing
- releasing
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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
- E21B23/00—Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells
- E21B23/01—Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells for anchoring the tools or the like
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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
- E21B17/02—Couplings; joints
- E21B17/021—Devices for subsurface connecting or disconnecting by rotation
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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
- E21B33/1208—Packers; Plugs characterised by the construction of the sealing or packing means
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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
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
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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
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/02—Equipment or details not covered by groups E21B15/00 - E21B40/00 in situ inhibition of corrosion in boreholes or wells
-
- 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/164—Injecting CO2 or carbonated water
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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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
Abstract
The invention relates to CO2Water alternating injection well completion string, water alternating injection well completion method and water alternating injection well completion service string, and application of water alternating injection well completion string to CO2And alternately injecting water and gas into the oil-displacing field. The well completion string comprises an anchoring mechanism and a sealing mechanism, wherein the anchoring mechanism is connected with an oil pipe and a casing, the anchoring mechanism consists of an oil pipe anchoring mechanism and a casing anchoring mechanism, and the sealing mechanism consists ofThe sealing insertion mechanism and the sealing short section are formed, and the casing is a new well casing or an inner lining casing. The well completion steps of the old well comprise: running a lining casing string by using a running service string; cementing; releasing the service pipe column; backwashing; waiting for coagulation; perforating; the injection string is run in and the string is depressed. The service pipe column comprises a locking claw releasing mechanism, a central pipe and a collision and pressing mechanism. The invention has the advantages that: the sealing mechanism has simple structure and reliable sealing, the anchoring mechanism has simple structure, and the sealing and anchoring are easier and more reliable; corrosion protection of the casing below the seal segment is achieved.
Description
Technical Field
The invention relates to the technical field of oil field development and gas injection in the petroleum industry, in particular to CO2A water alternating injection well completion string and a method and service string for completing the same.
Background
In the process of oil field development, along with the technical progress of oil field exploration and development, more and more low-permeability oil reservoirs and ultra-low-permeability oil reservoirs are explored and developed. Waterflooding is the most dominant mode of development in most reservoirs, but for partially lowThe oil reservoir and the whole ultra-low permeability oil reservoir are infiltrated, the water injection is difficult, even water is not injected, and the crude oil recovery rate and the economic benefit of the oil field are seriously influenced. In order to supplement the oil reservoir energy and improve the crude oil recovery, gas flooding, especially CO, is generally adopted at home and abroad2Development mode of the driver.
In contrast to water flooding development, if technology is not properly managed, CO2Flooding the well may create serious corrosion and scaling problems. Especially with CO2This problem is particularly acute in the case of alternating water injection, in the case of injection wells. All CO is currently available for protection of the casing and production safety2An annular packer is installed downhole of the injection well. Like chinese utility model patent "a gas injection tubular column in pit", patent application day: day 31, 01/2012, patent application No.: 201220030238.5, such a string with a downhole packer is disclosed. When corrosion and scaling occur, the packer may be difficult to unset out of the wellbore, increasing operating costs and even possibly causing well abandonment.
In the injection well, a downhole packer is installed at a position above the oil layer, and a section of the annulus from the perforation blasthole to the packer position is a section of permanent CO2Moisture, which is highly corrosive. Water CO2When the water is alternately injected, even if the corrosion inhibitor is added into the injected water, the corrosivity of moisture in the annular space above the perforation blasthole cannot be weakened, and the prior art has no effect on the protection of the section of casing.
The technology is developed, the sleeve above an oil layer can be protected from being corroded, the annular space of the oil sleeve can be conveniently sealed and released, and the technology has important significance for perfecting the CO2 flooding technology and reducing the production cost.
Disclosure of Invention
In order to solve the technical problems, CO is invented2The water alternate injection well completion pipe column, the water alternate injection well completion method and the service pipe column comprehensively solve the problems of difficult unsealing of a packer and corrosion resistance of a casing below the packer in the prior art, and provide a comprehensive technical scheme which can ensure reliable sealing of an oil casing annulus, can easily remove sealing and can also ensure that the casing below a sealing section is not corroded.
In order to achieve the purpose, the invention adopts the following technical scheme:
CO2the water alternate injection well completion string comprises an oil pipe, a casing, an anchoring mechanism and a sealing mechanism, wherein the anchoring mechanism is formed by the oil pipe anchoring mechanism connected to the oil pipe and the casing anchoring mechanism connected to the casing together, the sealing mechanism is formed by a sealing insertion mechanism connected to the oil pipe and a sealing short section connected to the casing together, and the casing is a new well casing or an inner lining casing.
In a preferred embodiment, the tubing anchor mechanism is a male shoulder and the casing anchor mechanism is an internal shoulder, the male shoulder having an outer diameter greater than the inner diameter of the internal shoulder.
In the preferred embodiment, the tubing anchoring mechanism is an external thread, the casing anchoring mechanism is an internal casing thread, and the external thread and the internal casing thread form a thread pair together. The thread pair is a conical thread pair.
In a preferred embodiment, the conical thread pair comprises an external conical thread, the external conical thread is arranged at the lower end of the threaded elastic claw, the threaded elastic claw is sleeved on the anchoring inner tube, the inner hole surface at the lower end of the threaded elastic claw is an internal conical surface, correspondingly, the external conical surface arranged on the outer surface of the insertion short section is matched with the internal conical surface, and the anchor releasing mechanism is arranged at the upper part of the threaded elastic claw. The anchor releasing mechanism is a torque transmission mechanism and comprises a torque transmission hole arranged at the upper part of the threaded elastic claw, and correspondingly, a torque transmission bulge arranged on the anchoring inner pipe is matched with the torque transmission hole.
In a preferred embodiment, the anchoring mechanism may also be a locking ring mechanism, which includes a lower locking ring disposed in an inner annular groove at the upper part of the threaded elastic claw, an upper locking ring disposed in an inner annular groove at the lower end of the unlocking sleeve, an unlocking thread disposed at the periphery of the anchoring inner tube, and an unlocking shear pin, wherein the lower locking ring is sleeved below the unlocking thread, the upper locking ring is sleeved on the unlocking thread, and the unlocking shear pin fixes the axial relative positions of the anchoring inner tube and the unlocking sleeve.
In a preferred embodiment, the oil pipe anchoring mechanism is a locking block anchoring mechanism, the locking block anchoring mechanism comprises locking block elastic claws, supporting protrusions and a locking mechanism, the supporting protrusions are arranged on the sealing insertion pipe, and the outer diameters of the supporting protrusions are matched with the inner diameters of the locking block elastic claws; the sleeve anchoring mechanism is a locking inner ring groove arranged on the inner wall of the sleeve. The locking mechanism is a pawl mechanism and comprises a pawl, a mandrel, a reset leaf spring and a release surface; the pawl mechanism is eccentrically arranged above the locking block elastic claw, a mandrel of the pawl mechanism is vertical to the axis of a shaft, and the pawl is fixed in a side wall hole of the locking block elastic claw by the mandrel; one end of the reset leaf spring is fixed on the outer wall of the locking block elastic claw, and the other end of the reset leaf spring freely compresses the upper end of the pawl.
In a preferred embodiment, the locking mechanism can also be a ball locking mechanism, which comprises a reset column spring, a lock ball outer ring groove, a lock ball inner ring groove, a lock ball release sleeve, a release positioning step and a release surface; the upper part of the elastic claw of the locking block is provided with a radial locking ball hole on the side wall, the locking ball is arranged in the locking ball hole, and the outer wall of the sealed insertion pipe is provided with a locking ball outer ring groove; a lock ball release sleeve is sleeved outside the lock ball hole, and the inner wall of the lock ball release sleeve is provided with a lock ball inner ring groove; the diameter of the lock ball is larger than the thickness of the lock ball hole, and the raised part of the lock ball is arranged in the lock ball outer ring groove or the lock ball inner ring groove; the outside of the locking block elastic claw is provided with a releasing and positioning step, and the reset column spring is axially arranged between the locking ball releasing sleeve and the releasing and positioning step.
In a preferred embodiment, the sealing insertion mechanism consists of an insertion short section connected to the oil pipe and a sealing ring sleeved outside the insertion short section; the sealing short section is provided with a section of smooth inner sealing surface which is matched with the outer surface of the sealing insertion mechanism.
In a preferred embodiment, the sealing insertion mechanism can also be composed of a sealing insertion pipe connected to the oil pipe, a sliding sealing ring sleeved outside the sealing insertion pipe, an outer sealing ring and an inner sealing ring which are arranged inside and outside the sliding sealing ring, wherein the part of the sealing insertion pipe, which is matched with the inner sealing ring, is a section of smooth pipe; the sealing short section is provided with a section of smooth inner sealing surface which is matched with the outer surface of the sealing insertion mechanism.
In a preferred embodiment, the part of the new well casing or the inner lining casing below the casing anchoring mechanism is made of corrosion-resistant metal material, and the sealing short joint is made of corrosion-resistant metal material.
In a preferred embodiment, the inner lining casing pipe, the casing anchoring mechanism connected with the upper part of the inner lining casing pipe and the sealing short section jointly form an inner lining casing pipe column, the inner lining casing pipe column is installed in an old well casing pipe, and cement stones are arranged in the annular space between the inner lining casing pipe column and the old well casing pipe. The inner bushing (12) is a collar-free bushing (132). The lower end of the inner lining sleeve (12) is provided with a floating shoe (10). A floating ball (153) of the floating shoe (10) is fixed below a grout return hole (154) by a floating ball claw (152), and a release lever (150) penetrates through a baffle plate (151) and is propped against the lower surface of the floating ball (153).
CO2A method of completing a water alternating injection well completion string comprising the steps of:
(a) a lining casing string is put into the old well casing by using a feeding service pipe string;
(b) injecting cement slurry from the feeding service pipe column to fill the annular space outside the inner lining pipe column;
(c) disconnecting the running service string from the inner liner string;
(d) washing out the excessive cement slurry in a reverse circulation manner;
(e) lifting the service pipe column to be above the inner lining pipe column;
(f) waiting for coagulation;
(g) pulling out and sending into a service pipe column;
(h) perforating;
(i) and (4) running the injection pipe column, inserting the sealing insertion mechanism into the sealing short section, activating the anchoring mechanism and pressing down the pipe column.
Said CO2The service pipe column comprises a locking claw releasing mechanism, a central pipe and a collision and pressing mechanism, wherein the locking claw releasing mechanism, the central pipe and the collision and pressing mechanism are sleeved outside the central pipe; the locking claw releasing mechanism comprises a releasing locking claw connected with the central pipe, a releasing piston supported in the releasing locking claw and a releasing shear pin; the releasing locking claw is a split elastic claw, one end of which is provided with a male thread meshed with the internal thread of the sleeve or one end of which is provided with a locking block andlocking the inner ring grooves; the releasing piston is sleeved outside the central tube, and the releasing shear pin fixes the axial relative position of the releasing piston and the central tube.
In the preferred embodiment, the notch of the releasing locking claw faces downwards, the releasing piston is arranged below the releasing locking claw, a pressure difference sealing surface is formed between the central pipe and the releasing piston above and below the pressure transfer hole, the bumping mechanism is connected to the lower end of the central pipe or the extension pipe, and the bumping seat is in dead connection.
In the preferred embodiment, the releasing locking claw can also have a notch upwards, the releasing piston is arranged above the releasing locking claw and seals the annular space between the central pipe and the sealing barrel, and the pressing seat of the pressing mechanism is connected with the central pipe or the extension pipe thereof through the constant-pressure shear pin. The collision pressing mechanism is a double-composite rubber plug mechanism.
The technical advantages of the invention are as follows:
1. the structure is simple. The sealing mechanism is formed by connecting a section of sealing short section on a well completion casing and connecting a section of sealing insert pipe on an oil pipe, and is the simplest sealing structure. The anchoring mechanism of the invention is only provided with a sleeve internal thread or an inner ring groove on the sleeve, and the tubing string is connected with a tubing anchoring mechanism matched with the sleeve anchoring mechanism. The sealing mechanism and the anchoring mechanism jointly form an anchoring sealing assembly of the underground injection string, and compared with an underground anchoring packer with the same function and complex structure, the anchoring sealing assembly has the advantages of simpler structure, easier sealing removal and anchoring, and more reliability.
2. The sealing is more reliable. According to the above, the sealing scheme of the invention is a sealing ring seal, which is extremely reliable compared with a packer seal.
3. Corrosion protection of the casing below the seal segment is achieved. The anchoring mechanism, the sealing mechanism and the casing below the anchoring mechanism realize corrosion protection by adopting a scheme of corrosion-resistant metal materials, and solve the problem that a corrosion inhibitor cannot reach the casing above a perforation blasthole to realize casing protection. The scheme is easy to implement, and can be realized by connecting a casing anchoring mechanism made of corrosion-resistant metal materials, a sealing short section and a lower casing when the casing is lowered, regardless of a new well or an old well.
Drawings
A more complete appreciation of the invention and many of the attendant advantages thereof will be readily obtained as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings, wherein the accompanying drawings are included to provide a further understanding of the invention and form a part of this specification, and the illustrated embodiments and descriptions thereof are intended to illustrate and not limit the invention. Some of the tools in the figures are too long and are broken for clarity, indicated by the dashed connections in the figures, in which:
FIG. 1 is CO2The structure of the old well completion pipe string of the water alternate injection well completion pipe string is shown schematically.
FIG. 2 is CO2The structure of the new well completion pipe string is schematic diagram of the water alternate injection well completion pipe string.
Fig. 3 is a schematic structural diagram of an anchoring mechanism and a sealing mechanism based on gravity loading.
Fig. 4 is a schematic structural diagram of an anchoring mechanism and a sealing mechanism based on screw thread pairs.
Fig. 5 is a schematic view of the anchoring and sealing mechanisms using threaded resilient jaws, in which a torque-transmitting anchor-releasing mechanism is used.
FIG. 6 is a schematic view of the anchoring and sealing mechanisms using threaded resilient jaws, showing a locking ring release mechanism.
FIG. 7 is a further exploded view of the FIG. 6 tubular string structure.
Fig. 8 is a structural schematic diagram of a threaded resilient claw.
Fig. 9 is a schematic structural view of an anchoring mechanism and a sealing mechanism based on locking block elastic claws, wherein the locking mechanism is a pawl mechanism which is in a locking state.
Fig. 10 is a schematic structural view of an anchoring mechanism and a sealing mechanism based on locking block elastic claws, wherein the locking mechanism is a pawl mechanism, and the pawl mechanism is in an unlocking state, and the upper structure of a lining casing string is also shown in the figure.
Fig. 11 is a schematic structural view of an anchoring mechanism and a sealing mechanism based on locking block elastic claws, wherein the locking mechanism is a ball locking mechanism, and the ball locking mechanism is in an unlocking state.
Fig. 12 is a schematic structural diagram of an anchoring mechanism and a sealing mechanism based on locking block elastic claws, wherein the locking mechanism is a ball locking mechanism, and the ball locking mechanism is in a locking state, and the upper structure of a lining casing string is also shown in the figure.
FIG. 13 is a schematic diagram of the configuration of an uncapped lined casing string and a threaded connection running joint.
FIG. 14 is a schematic view of the construction of an uncased liner casing string and service string based on a slotted drop-off latch, the ram being unthreading.
FIG. 15 is a schematic view of a floating shoe with float release mechanism.
FIG. 16 is a schematic view of the construction of an uncased liner casing string and service string based on a slotted-up-release latch dog, the ram seat of which is knockdown.
Fig. 17 is a schematic structural view of a double composite rubber plug mechanism.
FIG. 18 is a schematic diagram of a downhole completion string for zonal production.
Detailed Description
The terms "upper", "lower", "left" and "right" in the description and claims refer to the positional relationship as viewed from the perspective of the reader, with the top of the page being the top, the bottom of the page being the bottom, the left hand of the reader being the left, and the right hand of the reader being the right. When the relation of inside, outside or inside and outside of the pipe is described, the small radius is taken as inside or inside in the radial direction, and the large radius is taken as outside. The "oil jacket annulus" described below refers to the annular space between the casing and the outer pipe. The positions where there is a seal in each drawing are shown schematically, such as the seal ring 66 in fig. 6, and are not described in detail in the following description.
CO2The water alternately injects the well, can be new well, also can be old oil well, and the main problem that solves includes three aspect, firstly solves the anticorrosive problem of oil reservoir perforation porthole to the well casing between the packer, secondly solves the safe problem of coming out after the packer is in service for a long time in the pit, and thirdly is the annular sealing problem of oil casing that is reliable for a long time.
As the injected corrosion inhibitor cannot reach the inner wall of the casing above the perforation blasthole, the scheme of the invention essentially solves the problem of corrosion prevention of the casing by adopting a corrosion-resistant metal material. The corrosion-resistant metal material has corresponding products in the current domestic casing pipe production plant, such as a 3Cr casing pipe (a casing pipe with a chromium content of about 3%, the same shall apply hereinafter), a 5 Cr casing pipe, a 9 Cr casing pipe, a 13 Cr casing pipe and the like, and can also adopt a carbon steel casing pipe internally plated with a metal coating, such as a tungsten alloy (also called as nickel-tungsten alloy) coating casing pipe, a nickel-phosphorus coating casing pipe and the like which are successfully applied in the domestic at present. The sleeves have good corrosion resistance and are suitable for different working conditions. Similarly, the downhole tool related in the scheme comprises a sealing short section, a casing anchoring mechanism, an oil pipe anchoring mechanism, a sealing insertion mechanism and the like, the corrosion-resistant metal material can be used, one corrosion-resistant material can be used, and the combination of different corrosion-resistant materials can also be used.
See FIG. 1 for CO2The technical scheme of the water alternate injection well completion pipe string is an old well completion scheme and comprises an oil pipe 1, an inner lining sleeve 12, and an anchoring mechanism and a sealing mechanism which are connected on the oil pipe and the inner lining sleeve. The anchoring mechanism is composed of an oil pipe anchoring mechanism 4 connected to the oil pipe and a sleeve anchoring mechanism 5 connected to the lining sleeve. The sealing mechanism is composed of a sealing insertion mechanism 7 connected to the oil pipe and a sealing short joint 6 connected to the lining sleeve. The inner bushing pipe 12, the sleeve anchoring mechanism 5 connected with the upper part of the inner bushing pipe and the sealing short section 6 jointly form an inner bushing pipe column 22, the inner bushing pipe column 22 is installed in the old well sleeve 21, and cement stones 11 are arranged in the annular space between the inner bushing pipe column 22 and the old well sleeve 21.
The petroleum industry generally refers to the product of the setting of cement slurry as set cement.
See also FIG. 2 for CO2The technical scheme of the water alternate injection well completion pipe string is a new well completion scheme, and comprises an oil pipe 1, a new well casing 2, and an anchoring mechanism and a sealing mechanism which are connected on the oil pipe and the new well casing. The anchoring mechanism is composed of an oil pipe connected to the oil pipeThe anchoring means 4 are constituted together with casing anchoring means 5 attached to the new well casing. The sealing mechanism is composed of a sealing insertion mechanism 7 connected to the oil pipe and a sealing short section 6 connected to the new well casing.
Whether new well casing or liner casing, not specifically identified below, are collectively referred to as casing, with the drawings serving as a guide.
In order to prevent the backflow of the injected gas and improve the safety of production, a check valve 8 is generally installed at the lower part of the injection string.
The sealing nipple 6 is arranged above the perforation blasthole 9 in the figures 1 and 2.
Referring to fig. 3, the tubing anchor mechanism 4 is a male shoulder 31, the casing anchor mechanism 5 is an internal shoulder 32, and the outer diameter of the male shoulder 31 is greater than the inner diameter of the internal shoulder 32. When the injection pressure is not high and the sealing pressure difference of the sealing mechanism is not large, the shoulder anchoring mechanism can be used for pressing the outer convex shoulder on the oil pipe against the inner shoulder of the casing pipe by pressing the pipe column downwards, and the upper jacking force of the lower part is resisted by the pressing load.
Referring to fig. 4, the tubing anchor 4 is an external thread 41, the casing anchor 5 is an internal casing thread 42, and the external thread 41 and the internal casing thread 42 form a thread pair. The figures show a conical screw thread pair, but a cylindrical screw thread pair is also possible. Such a threaded anchoring mechanism may be used when the downhole injection pressure is high. When in use, the sealing insertion mechanism 7 is inserted into the sealing short section 6, and then the oil pipe is rotated to engage the thread pair.
In case of deep oil well or inconvenient rotation of oil pipe, the three-insertion mesh type conical screw pair anchoring mechanism of the preferred embodiment is designed for the convenience of installation of the screw pair anchoring mechanism, as shown in fig. 5. The conical thread pair comprises an external conical thread 52, the external conical thread 52 is arranged at the lower end of a threaded elastic claw 53, the threaded elastic claw 53 is sleeved on an anchoring inner pipe 54, the inner hole surface at the lower end of the threaded elastic claw 53 is an internal conical surface 51, correspondingly, the external conical surface arranged on the outer surface of the inserting short section 33 is matched with the internal conical surface, and the anchoring releasing mechanism is arranged at the upper part of the threaded elastic claw 53. The anchor releasing mechanism shown in the figure is a torque transmission mechanism, and comprises a torque transmission hole 55 arranged at the upper part of the threaded elastic claw 53, and correspondingly, a torque transmission bulge 56 arranged on the anchoring inner pipe 54 is matched with the torque transmission hole 55. The torque transmission hole may be a key slot or a long hole, so that the threaded resilient claw 53 has an axial movement space when inserted. By means of the external conical thread 52 and the internal conical surface 51 the anchoring means can resist the upward jacking force from the seal insertion means. To release the anchoring, the oil pipe is rotated and the torque is transmitted to the thread elastic claw 53 through the torque transmission mechanism, so that the conical thread pair can be reversed.
In order to further improve the convenience of operation, the fourth preferred embodiment provides an anchor releasing mechanism for the insertion meshing type conical thread pair anchoring mechanism. Referring to fig. 6, the anchoring mechanism according to the present embodiment is a locking ring mechanism, and includes a lower locking ring 61 disposed in an inner annular groove at an upper portion of the threaded elastic claw 53, an upper locking ring 62 disposed in an inner annular groove at a lower end of the unlocking sleeve 63, an unlocking thread 64 disposed at an outer periphery of the anchoring inner tube 54, and an unlocking shear pin 65, wherein the lower locking ring 61 is sleeved below the unlocking thread 64, the upper locking ring 62 is sleeved on the unlocking thread 64, and the unlocking shear pin 65 fixes an axial relative position of the anchoring inner tube 54 and the unlocking sleeve 63.
The unlocking thread and the upper and lower locking ring threads matched with the unlocking thread are saw-tooth one-way threads, and the structure of the unlocking thread is commonly used in a downhole hydraulic packer. The upper lock ring and the lower lock ring can only go up along the unlocking thread and can not go down along the unlocking thread.
In the condition shown in figure 6, the threaded resilient fingers 53 are free to move axially and the running string is run to engage the internal threads of the casing to achieve anchoring. When the anchoring is removed, the oil pipe is lifted up to drive the unlocking sleeve 63 to move upwards, the unlocking shear nail 65 is sheared, and the upper locking ring 62 climbs upwards along the unlocking thread 64. Then the oil pipe is lowered to drive the unlocking sleeve 63 to push the anchoring inner pipe 54 to move downwards through the upper locking ring 62, so that the lower locking ring 61 climbs onto the unlocking thread 64, and then the oil pipe is lifted upwards, at this time, because the inner conical surface between the thread elastic claw 53 and the inserted short section 33 is separated, the conical thread pair is disengaged due to radial loss of support, and the anchoring is released.
As shown in fig. 5 to 7, a connecting thread is provided between the inserting nipple 33 and the anchoring inner pipe 54, which is provided for clarity of description, and the actual tool design can be disassembled according to the requirements of materials, machining and assembly. For another example, fig. 7 illustrates the installation requirements of the upper and lower lock rings 62, 61 of fig. 6, with the threaded resilient fingers 53 separated into a lower cap 71 and the release sleeve 63 separated into an upper cap 72. In this specification, the parts which can be screwed together are mostly drawn as one part, and for clarity of description, the tool which can be one part is artificially disassembled, for example, the seal sub 6 and the casing anchoring mechanism 5 can be one part. The separation or integration of these parts is not a limitation of the present invention.
Referring to fig. 3 to 7, the sealing insertion mechanism 7 is composed of an insertion nipple 33 and a sealing ring 34 sleeved outside the insertion nipple; the sealing short section 6 is provided with a smooth inner sealing surface 35 which is matched with the outer surface of the sealing insertion mechanism 7.
The smooth sealing surface is a surface which meets the requirement of mechanical sealing and has roughness meeting the design requirement, and the roughness value can be found in a mechanical design manual and is a conventional technology. The cooperation of the sealing insertion mechanism and the sealing short section is also a common cooperation which can be found in a mechanical design manual. For brevity, similar descriptions are omitted below.
Fig. 8 shows a method of machining the threaded resilient fingers 53 by axially milling grooves in the wall of the tube to divide the end with the external conical thread into multiple lobes.
Fifth in the preferred embodiment, referring to fig. 9 and 10, the oil pipe anchoring mechanism 4 is a locking piece anchoring mechanism, the locking piece anchoring mechanism includes locking piece elastic claws 95, a supporting protrusion 94 and a locking mechanism, the supporting protrusion 94 is arranged on the sealing insertion pipe 97, and the outer diameter of the supporting protrusion 94 is matched with the inner diameter of the locking piece elastic claws 95; the sleeve anchoring mechanism 5 is a locking internal ring groove 96 arranged on the inner wall of the sleeve. The locking mechanism is a pawl mechanism 102 and comprises a pawl 98, a mandrel 99, a reset leaf spring 101 and a release surface 100; the pawl mechanism is eccentrically arranged above the locking block elastic claw 95, a mandrel 99 of the pawl mechanism is vertical to the axis of a shaft, and the pawl 98 is fixed in a side wall hole of the locking block elastic claw 95 by the mandrel 99; one end of a reset leaf spring 101 is fixed on the outer wall of the locking block elastic claw 95, and the other end freely compresses the upper end of the pawl.
A downward thrust is required during the process of the seal plug-in mechanism entering the seal nipple and during the process of the radial contraction of the lock block elastic claw 95 entering the locking inner annular groove 96, fig. 10 shows the state that the pawl reaches the front of the release surface, the support protrusion 94 presses on the pawl, and the downward pressure of the oil pipe is transmitted to the lock block elastic claw and the seal plug-in mechanism through the pawl. When the pawl passes through the releasing surface, the sealing insertion mechanism and the locking block elastic claw are in place, the supporting bulge 94 loses the blocking of the pawl and descends to reach the state shown in fig. 9, the locking block part of the locking block elastic claw is radially supported, and the anchoring mechanism plays an anchoring role. To release the anchoring, the oil pipe is lifted. For convenience of operation, a convex shoulder is generally arranged on the periphery of the sealing insertion mechanism or the anchoring mechanism, fig. 9 shows that an outer positioning step 93 is arranged on the periphery of the sliding sealing ring 90, and when the sealing insertion mechanism is in place by pressing down the pipe column, the outer positioning step 93 is pressed on the upper opening step of the sealing short section, so that reliable sealing of the sealing mechanism is ensured.
Figure 9 shows the connection of the new well casing to the downhole tool and figure 10 shows the connection of the inner liner to the downhole tool.
Another preferred embodiment of the locking mechanism is a ball locking mechanism, see fig. 11 and 12. Fig. 11 shows an unlocked state of the ball lock mechanism, and fig. 12 shows a locked state of the ball lock mechanism.
In the unlocked state shown in fig. 11, the locking mechanism is a ball locking mechanism 110, which includes a return bolt 111, a lock ball 112, an outer lock ball groove 113, an inner lock ball groove 114, a lock ball release sleeve 115, a release detent step 116, and a release surface 100; the upper part of the locking block elastic claw 95 is provided with a radial locking ball hole on the side wall, a locking ball 112 is arranged in the locking ball hole, the outer wall of the sealed insertion pipe 97 is provided with a locking ball outer ring groove 113 opposite to the locking ball hole, the diameter of the locking ball 112 is larger than the thickness of the locking ball hole, and the part of the locking ball exposed out of the locking ball hole extends into the locking ball outer ring groove 113; a lock ball release sleeve 115 is fitted around the outside of the lock ball hole, a lock ball inner annular groove 114 is provided on the inner wall of the lock ball release sleeve 115, a release positioning step 116 is provided on the outside of the lock piece resilient claw 95, and the return spring 111 is axially disposed between the lock ball release sleeve 115 and the release positioning step 116.
Fig. 11 shows the unlocked state of the ball lock mechanism, from a run-in perspective, before the ball lock mechanism reaches the release face. The operation of the ball locking mechanism is described below in conjunction with fig. 11 and 12. Since the diameter of the locking ball 112 is greater than the thickness of the locking ball hole, the portion of the locking ball that is higher than the locking ball hole in the unlocked state is disposed in the locking ball outer ring groove 113, and the locking ball 112 axially secures the seal insert 97 and the locking piece resilient fingers 95 together. The oil pipe is lowered, the sealing insertion pipe 97, the oil pipe anchoring mechanism and the sealing insertion mechanism can move downwards at the same time, the sealing insertion mechanism enters the sealing short section, the locking piece of the elastic claw of the locking piece enters the locking inner annular groove 96, the locking ball release sleeve 115 moves upwards under the upward jacking force of the release surface 100, when the locking ball inner annular groove 114 is aligned with the locking ball hole, the locking ball enters the locking ball inner annular groove 114 under the radial extrusion force of the locking ball outer annular groove 113 on the sealing insertion pipe 97, at this time, the sealing insertion pipe 97 is separated from the elastic claw 95 of the locking piece, the sealing insertion pipe moves downwards, the supporting protrusion 94 is supported on the inner side of the elastic locking piece of the locking piece, and the anchoring process is completed, as shown in. To release the anchoring, the oil pipe is lifted.
The locking balls 112 may also be replaced by cylinders, as in cylindrical roller bearings.
Fig. 11 shows the connection of the new well casing to the downhole tool and fig. 12 shows the connection of the inner liner to the downhole tool.
Another preferred embodiment of the seal insert mechanism is seen in fig. 9-12. The sealing insertion mechanism 7 is composed of a sealing insertion pipe 97 connected to the oil pipe, a sliding sealing ring 90 sleeved outside the sealing insertion pipe, an outer sealing ring 91 and an inner sealing ring 92 which are arranged inside and outside the sliding sealing ring, and the part of the sealing insertion pipe 97, which is matched with the inner sealing ring 92, is a smooth pipe; the sealing short section 6 is provided with a smooth inner sealing surface 35 which is matched with the outer surface of the sealing insertion mechanism 7.
CO2Crossing with waterThe well completion method for replacing injection well completion string is to connect sealing short joint and casing anchoring mechanism on the casing of new well. For an old well, the method comprises the following steps:
(a) running an inner lining pipe string 22 in the old well casing 21 by using a feeding service pipe string;
(b) injecting cement slurry from the feeding service pipe column to fill the annular space outside the inner lining pipe column;
(c) disconnecting the running service string from the inner liner string;
(d) washing out the excessive cement slurry in a reverse circulation manner;
(e) lifting the service pipe column to be above the inner lining pipe column;
(f) waiting for coagulation;
(g) pulling out and sending into a service pipe column;
(h) perforating;
(i) and (4) putting in the gas injection pipe column, inserting the sealing insertion mechanism 7 into the sealing short section 6, activating the anchoring mechanism and pressing down the pipe column.
The rest is the conventional well completion procedures of connecting a tubing hanger, installing a wellhead and the like.
Activation of the anchoring mechanism is an operation performed to bring the anchoring mechanism into the anchoring state.
Generally, the annular protection liquid needs to be injected into the oil jacket ring air above the sealing mechanism, and the annular protection liquid can be replaced by the annular protection liquid before the sealing insertion mechanism is inserted, or the sliding sleeve 3 is opened to replace the annular protection liquid after the well is completed and then the sliding sleeve is closed.
The running service string may be run into the running service tool using drill pipe or tubing.
Figure 13 shows a liner casing cementing string with the service tool having an upper joint, the liner casing having a sealing nipple 6 attached thereto, and the casing internal threads 42 serving as the later casing anchoring mechanism.
Figure 14 shows a service tool for use with a service string. The service pipe column comprises a locking claw releasing mechanism 140 sleeved outside a central pipe 141, the central pipe 141 and a collision and pressing mechanism 149 connected below the central pipe; the locking claw releasing mechanism comprises a releasing locking claw 142 connected with a central pipe 141, a releasing piston 143 supported in the releasing locking claw and a releasing shear pin 144; the releasing locking claw is a split elastic claw, and one end of the releasing locking claw is provided with a male thread which is meshed with the internal thread 42 of the sleeve; the releasing piston is sleeved outside the central tube, and the releasing shear pin 144 fixes the axial relative position of the releasing piston and the central tube. The mouth of the releasing locking claw 142 is downward, the releasing piston 143 is mounted below the releasing locking claw 142, a pressure difference sealing surface is formed between the central tube 141 and the releasing piston at the upper and lower parts of the pressure transfer hole 145, and the pressing seat 148 of the pressing mechanism 149 is in dead connection. The above-mentioned "release piston 143 supported in the release pawl" means that the upper end of the illustrated release piston is supported in the lower end of the release pawl to prevent the release pawl from radially contracting.
The above-mentioned "releasing piston 143 is mounted below the releasing locking claw 142", which means that the releasing piston is generally located below the releasing locking claw in the illustrated state, but the upper part of the releasing piston and the lower part of the releasing locking claw have an axially overlapped section, which functions to support the releasing locking claw in the radial direction, to ensure the effective engagement of the thread pair before releasing, and the subsequent shearing movement of the shear pin by the releasing piston is downward.
Figure 15 shows a service tool for the same type of service string as in figure 14, except that the coupling of the release pawl to the casing is done in the arrangement of figure 15, where a locking block is provided at one end of the release pawl to mate with a locking internal recess 96.
The dead joint means that the striker 148 is not hydraulically disengageable, and the striker is shown as being threaded into the center tube, although it could be welded.
When the inner liner is longer, an extension tube 146 is typically connected between the center tube and the ram mechanism, as shown in FIG. 15, in order to completely wash out the grout in the inner liner.
The latch mechanism shown in fig. 14 is composed of a latch ball 147 and a latch base 148. The arrangement purposes of the bumping mechanisms are two, firstly, a pressure signal is provided for an operator on the ground, when the bumping ball is bumped to the bumping seat, the ground pressure is increased, and cement paste is replaced into the annular space; and secondly, hydraulic pressure is provided for releasing the service pipe column. To better synchronize the pressure signal with the completion of the grout insertion, a tubing plug 155 may also be used to bump in, as shown in FIG. 15.
Referring to FIG. 16, another embodiment of a service tool for use in a service string is shown. The service pipe column comprises a locking claw releasing mechanism 140 sleeved outside a central pipe 141, the central pipe 141 and a collision and pressing mechanism 149 connected to the lower end of the central pipe or an extension pipe; the locking claw releasing mechanism 140 comprises a releasing locking claw 142 connected with a central pipe 141, a releasing piston 143 supported in the releasing locking claw and a releasing shear pin 144; the releasing locking claw is a split elastic claw, and one end of the releasing locking claw is provided with a male thread which is meshed with the internal thread 42 of the sleeve; the releasing piston 143 is sleeved outside the central tube 141, and the releasing shear pin 144 fixes the axial relative position of the releasing piston and the central tube. The back-off dogs 142 are slotted up and the back-off piston 143 is mounted above the back-off dogs 142 and seals the annulus between the base pipe 141 and the sealing sleeve 163. The bumping mechanism 149 comprises an oil pipe plug 155, a constant pressure shear pin 162, a bumping seat 148 and a ball float seat 161, wherein the bumping seat 148 is connected with the central pipe 141 or the extension pipe 146 thereof through the constant pressure shear pin 162. The constant pressure shear ring can also be replaced by a shear ring. In order to prevent the injected cement slurry from returning from the annular space to the inside of the inner bushing, as shown in fig. 17, the pressing mechanism 149 preferably uses a double-composite rubber plug mechanism, which includes an oil tube rubber plug 155, a constant pressure shear pin 162, a sleeve rubber plug 157 and a rubber plug seat 158, the lower portions of the oil tube rubber plug and the sleeve rubber plug are respectively provided with a sealing ring and a snap spring, and correspondingly, a snap spring groove and a sealing surface are arranged in the inner cavities of the sleeve rubber plug and the rubber plug seat.
The above-mentioned "releasing piston 143 is mounted above the releasing locking claw 142", which means that the releasing piston is generally located above the releasing locking claw in the illustrated state, but the lower part of the releasing piston and the upper part of the releasing locking claw have an axially overlapped section, which functions to support the releasing locking claw in the radial direction, to ensure the effective engagement of the thread pair before releasing, and the subsequent shearing movement of the shear pin by the releasing piston is upward.
In the above-mentioned solution of fig. 16, the "releasing locking claw is a split elastic claw, and one end of the releasing locking claw is provided with a male thread engaged with the internal thread 42 of the sleeve", and like the solution shown in fig. 15, the solution in fig. 16 may also adopt a solution of "one end of the releasing locking claw is provided with a locking piece matched with the locking internal annular groove" instead of the thread pair solution.
As shown in FIGS. 13-16, the inner liner 12 is typically formed using an unconfined casing 132, although conventional walled casings may be used.
As shown in fig. 16, the locking inner ring groove 96 and the sleeve internal thread 42 are arranged at the position above the sealing short section, so that the matching requirements of different oil pipe anchoring mechanisms can be met, and the matching anchoring requirements of the threaded elastic claw and the locking block elastic claw can be met. Meanwhile, as can also be seen from fig. 16, the sealing barrel 163 and the casing anchoring mechanism, including the locking inner ring groove 96 and the casing internal thread 42, may be disposed on the same component as the sealing nipple 6, and of course, may be separated into a plurality of components if necessary.
In order to prevent the injected cement slurry from returning from the annulus into the inner liner, the new well casing 2 or the inner liner 12 is typically provided with a float shoe 10 at its lower end, as shown in fig. 1 and 2. In order to prevent the float ball and the float seat from being damaged by grout, as shown in fig. 15, the float ball 153 of the floating shoe 10 is fixed below the grout return hole 154 by the float claw 152, and the release lever 150 is pressed against the lower side of the float ball 153 through the blocking plate 151. When the casing reaches the bottom of the well, the release lever 150 pushes the floating ball 153 against the lower opening of the floating ball seat 161 and compresses, and this structure has another advantage that the sealing effect between the floating ball 153 and the floating ball seat 161 is better, and a double sealing effect can be formed with the above-mentioned double composite rubber plug structure, so that the function of preventing cement paste from returning is more reliable.
The invention can be used not only for CO2The water alternate injection working condition can be used in other water-gas alternate injection working conditions, and can also be used in single fluid underground injection working conditions, such as continuous CO injection2The working conditions of gas, air or water and the like can also be used for other various working conditions requiring sealing in the underground, such as H-containing working conditions for safe operation2The anchoring mechanism and the sealing mechanism are arranged at the position above the underground oil layer of the S well.
The invention can also be used for a layered injection or layered oil production well, and as shown in figure 18, when more than 2 sealing short joints 6 are arranged underground, the same number of sealing insertion mechanisms 7 are used for matching, so that layered production can be realized. Fig. 18 shows the completion of a new well only, and the same structure is used for lining the old well and cementing the well.
It will be apparent that those skilled in the art can make many modifications and variations based on the spirit of the present invention.
Claims (22)
1.CO2A well completion string for water alternate injection wells comprises an oil pipe (1), a casing, an anchoring mechanism and a sealing mechanism, and is characterized in that the anchoring mechanism is formed by an oil pipe anchoring mechanism (4) connected to the oil pipe and a casing anchoring mechanism (5) connected to the casing, the sealing mechanism is formed by a sealing insertion mechanism (7) connected to the oil pipe and a sealing short joint (6) connected to the casing, the casing is a new well casing (2) or an inner lining casing (12), and the number of the sealing mechanisms is more than 1.
2. CO according to claim 12A water alternate injection well completion string, characterized in that said tubing anchor means (4) is a male shoulder (31) and said casing anchor means (5) is an inner shoulder (32), the outer diameter of the male shoulder (31) being larger than the inner diameter of the inner shoulder (32).
3. CO according to claim 12The water alternate injection well completion string is characterized in that the oil pipe anchoring mechanism (4) is an external thread (41), the casing anchoring mechanism (5) is an internal casing thread (42), and the external thread (41) and the internal casing thread (42) form a thread pair together.
4. CO according to claim 32The water alternate injection well completion string is characterized in that the thread pair is a conical thread pair.
5. CO according to claim 42The water alternate injection well completion string is characterized in that the conical thread pair comprises an outer conical thread (52), the outer conical thread (52) is arranged at the lower end of a threaded elastic claw (53), the threaded elastic claw (53) is sleeved on an anchoring inner pipe (54), the inner hole surface at the lower end of the threaded elastic claw (53) is an inner conical surface (51), correspondingly, the outer conical surface arranged on the outer surface of the inserting nipple (33) is matched with the inner conical surface, and an anchor releasing mechanism is arranged on the upper part of the threaded elastic claw (53).
6. CO according to claim 52The water alternate injection well completion string is characterized in that the anchoring and releasing mechanism is a torque transmission mechanism and comprises a torque transmission hole (55) arranged at the upper part of the threaded elastic claw (53), and correspondingly, a torque transmission bulge (56) arranged on the anchoring inner pipe (54) is matched with the torque transmission hole (55).
7. CO according to claim 52The water alternate injection well completion string is characterized in that the anchoring releasing mechanism is a locking ring mechanism and comprises a lower locking ring (61) arranged in an inner annular groove at the upper part of a threaded elastic claw (53), an upper locking ring (62) arranged in an inner annular groove at the lower end of a releasing sleeve (63), a releasing thread (64) arranged on the periphery of an anchoring inner pipe (54) and a releasing shear pin (65), the lower locking ring (61) is sleeved below the releasing thread (64), the upper locking ring (62) is sleeved on the releasing thread (64), and the releasing shear pin (65) fixes the axial relative position of the anchoring inner pipe (54) and the releasing sleeve (63).
8. CO according to claim 12The water alternate injection well completion string is characterized in that the oil pipe anchoring mechanism (4) is a locking block anchoring mechanism which comprises locking block elastic claws (95), supporting bulges (94) and a locking mechanism, wherein the supporting bulges (94) are arranged on a sealing insertion pipe (97), and the outer diameter of the supporting bulges (94) is matched with the inner diameter of the locking block elastic claws (95); the sleeve anchoring mechanism (5) is arranged in a locking part arranged on the inner wall of the sleeveAn annular groove (96).
9. CO according to claim 82The water alternate injection well completion string is characterized in that the locking mechanism is a pawl mechanism (102) and comprises a pawl (98), a mandrel (99), a reset leaf spring (101) and a release surface (100); the pawl mechanism is eccentrically arranged above the locking block elastic claw (95), a mandrel (99) of the pawl mechanism is vertical to the axis of a shaft, and the pawl (98) is fixed in a side wall hole of the locking block elastic claw (95) by the mandrel (99); one end of a reset leaf spring (101) is fixed on the outer wall of the locking block elastic claw (95), and the other end freely compresses the upper end of the pawl.
10. CO according to claim 82The water alternate injection well completion string is characterized in that the locking mechanism is a locking ball mechanism (110) which comprises a reset column spring (111), a locking ball (112), a locking ball outer ring groove (113), a locking ball inner ring groove (114), a locking ball release sleeve (115), a release positioning step (116) and a release surface (100); a radial ball locking hole is formed in the side wall of the upper part of the locking block elastic claw (95), a locking ball (112) is arranged in the ball locking hole, and a ball locking outer ring groove (113) is formed in the outer wall of the sealing insertion pipe (97); a lock ball release sleeve (115) is sleeved outside the lock ball hole, and a lock ball inner ring groove (114) is arranged on the inner wall of the lock ball release sleeve (115); the diameter of the lock ball (112) is larger than the thickness of the lock ball hole, and the raised part of the lock ball is arranged in the lock ball outer ring groove (113) or the lock ball inner ring groove (114); a release positioning step (116) is arranged outside the locking block elastic claw (95), and the reset column spring (111) is axially arranged between the locking ball release sleeve (115) and the release positioning step (116).
11. CO according to claim 12The water alternate injection well completion pipe string is characterized in that the sealing insertion mechanism (7) consists of an insertion nipple (33) connected to an oil pipe and a sealing ring (34) sleeved outside the insertion nipple; the sealing short section (6) is provided with a section of smooth inner sealing surface (35) and a sealing plugThe outer surfaces of the inlet mechanisms (7) are matched.
12. CO according to claim 12The water alternate injection well completion string is characterized in that the sealing insertion mechanism (7) consists of a sealing insertion pipe (97) connected to an oil pipe, a sliding sealing ring (90) sleeved outside the sealing insertion pipe, an outer sealing ring (91) and an inner sealing ring (92) which are arranged inside and outside the sliding sealing ring, wherein the part, matched with the inner sealing ring (92), of the sealing insertion pipe (97) is a smooth pipe; the sealing short section (6) is provided with a section of smooth inner sealing surface (35) which is matched with the outer surface of the sealing insertion mechanism (7).
13. CO according to claim 12The water alternate injection well completion string is characterized in that the part of the new well casing (2) or the inner lining casing (12) below the casing anchoring mechanism (5) is made of corrosion-resistant metal materials, and the sealing short section (6) is made of corrosion-resistant metal materials.
14. CO according to any one of claims 1 to 132The water alternate injection well completion string is characterized in that the lining casing pipe (12), a casing anchoring mechanism (5) connected with the upper portion of the lining casing pipe and a sealing short joint (6) jointly form a lining casing string (22), the lining casing string (22) is installed in an old well casing pipe (21), and cement stones (11) are arranged in the annular space between the lining casing string (22) and the old well casing pipe (21).
15. CO according to claim 142A water alternating injection well completion string, characterized in that said inner liner (12) is an unjointed casing (132).
16. CO according to claim 142The well completion string for the water alternate injection well is characterized in that a floating shoe (10) is arranged at the lower end of the inner lining sleeve (12).
17. CO according to claim 162The well completion string for water alternate injection well is characterized in that a floating ball (153) of the floating shoe (10) is fixed below a mud return hole (154) by a floating ball claw (152), and a release lever (150) penetrates through a baffle plate (151) and abuts against the lower surface of the floating ball (153).
18. CO for use according to claim 142A method of completing a water alternating injection well completion string comprising the steps of:
(a) running a lining casing string (22) in the old well casing (21) by using a running service string;
(b) injecting cement slurry from the feeding service pipe column to fill the annular space outside the inner lining pipe column;
(c) disconnecting the running service string from the inner liner string;
(d) washing out the excessive cement slurry in a reverse circulation manner;
(e) lifting the service pipe column to be above the inner lining pipe column;
(f) waiting for coagulation;
(g) pulling out and sending into a service pipe column;
(h) perforating;
(i) and (3) putting in the gas injection pipe column, inserting the sealing insertion mechanism (7) into the sealing short section (6), activating the anchoring mechanism, and pressing down the pipe column.
19. CO for use according to claim 182The service string of the well completion method for the water alternate injection well is characterized by comprising a locking claw releasing mechanism (140), a central pipe (141) and a collision and pressing mechanism (149) which are sleeved outside the central pipe (141); the locking claw releasing mechanism comprises a releasing locking claw (142) connected with a central pipe (141), a releasing piston (143) supported in the releasing locking claw and a releasing shear pin (144); the releasing locking claw is a split elastic claw, one end of the releasing locking claw is provided with a male thread which is meshed with the internal thread (42) of the sleeve or one end of the releasing locking claw is provided with a locking block which is matched with a locking inner ring groove (96); the releasing piston is sleeved outside the central tube, and the releasing shear pin (144) is fixedThe axial opposite position of the releasing piston and the central tube.
20. CO according to claim 192The service string of the well completion method of the water alternate injection well completion string is characterized in that a notch of a releasing locking claw (142) is downward, a releasing piston (143) is installed below the releasing locking claw (142), a differential pressure sealing surface is formed between a central pipe (141) and the releasing piston and above and below a pressure transfer hole (145), a collision and pressing mechanism (149) is connected to the lower end of the central pipe or an extension pipe, and a collision and pressing seat (148) is in dead connection.
21. CO according to claim 192The service string of the well completion method of the water alternate injection well completion string is characterized in that a notch of a releasing locking claw (142) is upward, a releasing piston (143) is arranged above the releasing locking claw (142) and seals an annular space between a central pipe (141) and a sealing barrel (163), and a bumping seat (148) of a bumping mechanism (149) is connected with the central pipe (141) or an extension pipe (146) thereof through a constant pressure shear pin (162).
22. CO according to claim 212The service string of the well completion method for the water alternate injection well is characterized in that the bumping mechanism (149) is a double composite rubber plug mechanism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010653122.6A CN111980610B (en) | 2020-07-08 | 2020-07-08 | CO 2 Water alternate injection well completion pipe column, well completion method thereof and service pipe column |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010653122.6A CN111980610B (en) | 2020-07-08 | 2020-07-08 | CO 2 Water alternate injection well completion pipe column, well completion method thereof and service pipe column |
Publications (2)
| Publication Number | Publication Date |
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| CN111980610A true CN111980610A (en) | 2020-11-24 |
| CN111980610B CN111980610B (en) | 2022-11-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010653122.6A Active CN111980610B (en) | 2020-07-08 | 2020-07-08 | CO 2 Water alternate injection well completion pipe column, well completion method thereof and service pipe column |
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| Country | Link |
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| CN (1) | CN111980610B (en) |
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| CN115467644A (en) * | 2022-11-02 | 2022-12-13 | 华运隆腾机械制造有限公司 | Corrosion-resistant carbon dioxide gas production wellhead device |
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| CN115467644B (en) * | 2022-11-02 | 2023-02-10 | 华运隆腾机械制造有限公司 | Corrosion-resistant carbon dioxide gas production wellhead device |
Also Published As
| Publication number | Publication date |
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| CN111980610B (en) | 2022-11-18 |
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