CN112796693A - Pre-releasing filling tool and pre-releasing positive well-flushing sand-prevention well completion method - Google Patents
Pre-releasing filling tool and pre-releasing positive well-flushing sand-prevention well completion method Download PDFInfo
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- CN112796693A CN112796693A CN202110397317.3A CN202110397317A CN112796693A CN 112796693 A CN112796693 A CN 112796693A CN 202110397317 A CN202110397317 A CN 202110397317A CN 112796693 A CN112796693 A CN 112796693A
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- 238000011010 flushing procedure Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000007246 mechanism Effects 0.000 claims abstract description 142
- 238000007789 sealing Methods 0.000 claims abstract description 109
- 238000010276 construction Methods 0.000 claims abstract description 45
- 239000004576 sand Substances 0.000 claims abstract description 35
- 238000005406 washing Methods 0.000 claims abstract description 29
- 238000007667 floating Methods 0.000 claims abstract description 13
- 230000008569 process Effects 0.000 claims abstract description 10
- 238000010008 shearing Methods 0.000 claims abstract description 5
- 239000007788 liquid Substances 0.000 claims description 45
- 229910000831 Steel Inorganic materials 0.000 claims description 26
- 239000010959 steel Substances 0.000 claims description 26
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 16
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 16
- 241001330002 Bambuseae Species 0.000 claims description 16
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 16
- 239000011425 bamboo Substances 0.000 claims description 16
- 230000009471 action Effects 0.000 claims description 15
- 125000006850 spacer group Chemical group 0.000 claims description 10
- 230000000903 blocking effect Effects 0.000 claims description 8
- 238000003825 pressing Methods 0.000 claims description 8
- 210000002445 nipple Anatomy 0.000 claims description 5
- 239000012530 fluid Substances 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000013461 design Methods 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 230000001681 protective effect Effects 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000011001 backwashing Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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 boreholes or wells
- E21B23/01—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells for anchoring the tools or the like
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B34/08—Valve arrangements for boreholes or wells in wells responsive to flow or pressure of the fluid obtained
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- Mining & Mineral Resources (AREA)
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- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
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Abstract
The invention relates to a pre-releasing filling tool and a pre-releasing positive well-flushing sand-prevention well completion method. The technical scheme is as follows: the pre-releasing filling service mechanism is connected with the hydraulic seat sealing mechanism through a hand-releasing head by using a back-off thread, the lower end of the pre-releasing filling service mechanism is in sealing fit with the sliding sleeve type channel control mechanism through a shearing pin, and the bottom of the hydraulic seat sealing mechanism is connected with the filling mechanism; the lower end of the sliding sleeve type channel control mechanism is connected with a wash pipe in the inner cavity of the sleeve, the lower end of the wash pipe is connected with a high-pressure sealing rod through an annular throttling valve, the lower side of the sleeve is connected with a sieve pipe, and the lower end of the sieve pipe is connected with a floating shoe through a high-temperature sealing cylinder. The beneficial effects are that: the invention realizes the positioning of different construction procedures in the filling construction process by lifting and lowering the filling tool; the function of back-off releasing before filling is realized through a forward rotation pipe column; the functions of positive circulation well flushing, circulation filling and reverse circulation sand washing are realized through a sliding sleeve type channel control mechanism and an annular throttling valve; the invention can reduce the construction risk and improve the construction success rate.
Description
Technical Field
The invention relates to the technical field of oil and gas exploitation in oil fields, in particular to a pre-releasing filling tool and a pre-releasing positive well-flushing sand-prevention well completion method.
Background
In the development of the currently known oil field, along with the increase of drilling and production development of deep wells and complex wells, especially continuous innovation of drilling and well completion technologies, higher requirements are put forward on the functions and technical schemes of the sand control well completion tool. The sand control completion technology is a necessary process technology for filling sand control operation on a sand production well and completing different operations by using a sand control completion tool, although the sand control completion tools in the current market are various, long-term investigation shows that the sand control completion tools have different technical bottlenecks, and the specific steps are as follows:
1. the device does not have the function of positive circulation well washing, and once the device cannot fall to the position due to resistance in the well descending process, the sand prevention operation fails;
2. the back-off releasing is carried out after the sand control operation, so that the risk of blocking the pipe column due to the fact that the pipe column cannot be opened after the back-off releasing is carried out;
3. after the filling construction is finished, the well is back-washed after the pipe column is lifted, and certain risk of sand blocking the pipe column is generated.
At present, no sand control completion technology and matched tools can achieve the functions in the market.
Chinese patent document No. CN207620779U, its patent name is "a pre-releasing filling device", which includes a well-retaining part and a releasing part arranged in it, the releasing head of the releasing part is positioned in the central tube of the well-retaining part and connected by left-hand thread buckle type; when a well completion pipe string is established, the well remaining part is communicated with the oil sleeve annulus, the well remaining part is connected with a sand control pipe, the sand control pipe is connected with a centralizer, and the lowest end of the sand control pipe is connected with the plug; the oil pipe is connected with the first end of the releasing part, the washing pipe is connected with the second end of the releasing part, and the lower end of the releasing part is provided with a left-handed connecting screw thread connected with the well reserving part.
Because the three-section open hole sand control completion has the requirement of positive circulation well washing in the well descending process, the patent product has the following defects: the well-descending process can not realize positive circulation well washing, and the sand prevention application of open hole completion with three openings can not be met.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a pre-releasing filling tool and a pre-releasing well-washing sand-prevention well completion method, which can reduce the construction risk and improve the construction success rate; the pre-releasing filling tool integrates the functions of positive circulation well flushing, back-off releasing before filling, circulation filling, reverse circulation sand washing and the like, and can realize the positioning of different construction procedures in the filling construction process by lifting and lowering the filling tool; the function of back-off releasing before filling is realized through a forward rotation pipe column; the functions of positive circulation well flushing, circulation filling and reverse circulation sand washing are realized through a sliding sleeve type channel control mechanism and an annular throttling valve.
The invention provides a pre-releasing filling tool, which adopts the technical scheme that: the system comprises a pre-releasing filling service mechanism, a hydraulic seat sealing mechanism, a filling mechanism and a sliding sleeve type channel control mechanism, wherein the pre-releasing filling service mechanism is connected with the hydraulic seat sealing mechanism through a hand-losing head by using a back-off thread, the lower end of the pre-releasing filling service mechanism is in sealing fit with the sliding sleeve type channel control mechanism through a shearing pin, and the bottom of the hydraulic seat sealing mechanism is connected with the filling mechanism;
a centering spring is arranged on the upper part of the throwing head on the pre-releasing filling service mechanism, the upper part of the centering spring is connected with a bearing, and under the double action of the bearing and the centering spring, the extra pressure on the back-off thread during back-off releasing construction is reduced;
the switching valve on the filling mechanism is provided with a groove, the elastic sleeve on the pre-releasing filling service mechanism is provided with a boss, and when the pipe column is lifted, the boss enters the groove to drive the switching valve to move upwards so as to close the filling port;
the middle ball seat on the sliding sleeve type channel control mechanism is provided with a liquid discharge hole, a lower check block and a steel ball are arranged in the lower ball seat of the sliding sleeve type channel control mechanism, and the lower ball seat enables liquid to flow only in a single direction under the action of the lower check block and the steel ball.
Preferably, the pre-releasing filling service mechanism comprises an upper joint, a piston, a hydraulic cylinder, an upper ball seat, a connecting inner pipe, a bearing, a centering spring, a releasing head, a movable pressing cap, a movable joint, a filling pipe, a buckle changing joint, a double-way body, a ball seat bushing, a connecting pipe, a supporting pipe, an elastic sleeve, a ball seat joint and a flushing pipe nipple, wherein the hydraulic cylinder is installed on the outer side of the upper joint, the upper ball seat is connected to the center of the upper joint, the piston is arranged in an annular space between the hydraulic cylinder and the upper ball seat, the lower end of the upper ball seat is connected with the connecting inner pipe, the bearing, the centering spring and the releasing head are arranged on the outer wall of the connecting inner pipe, and the centering; the lower end of the connecting inner pipe is connected with a movable joint through a movable pressing cap, the lower end of the movable joint is connected with a filling pipe, the lower end of the filling pipe is connected with a double-way body through a buckle changing joint, a ball seat bushing is arranged in an inner cavity of the double-way body, the lower end of the double-way body is connected with a supporting pipe through a connecting pipe, the lower end of the supporting pipe is installed at the ball seat joint, an elastic sleeve is arranged on the outer wall of the supporting pipe, and.
Preferably, foretell hydraulic pressure seat seals mechanism includes clamping ring, deblocking joint, seat seal pin, catch, sheath, center tube I, deblocking pin, sleeve, high temperature packing element, spacer ring, goes up centrum, slip cover, spring leaf, slips, interior helmet, centrum down, the lower extreme inboard of clamping ring is connected the deblocking joint, and the lower extreme outer wall is equipped with the sheath, and the lower extreme inboard of deblocking joint connects center tube I, and the lower extreme of sheath is fixed with muffjoint, and the telescopic outside is equipped with high temperature packing element and spacer ring, and the downside of spacer ring is equipped with the centrum, and the downside of going up the centrum is equipped with slip cover, spring leaf, slips and centrum down, and the spring leaf is established between slips and slip cover.
Preferably, the filling mechanism comprises a sealing cylinder, an adjusting ring, a high-pressure sealing piece I, a filling cylinder, a switch valve spring, a centralizing joint and a lower joint, the lower end of the sealing cylinder is connected with the filling cylinder, the adjusting ring and the high-pressure sealing piece I are arranged in the inner cavity of the sealing cylinder, the switch valve and the switch valve spring are arranged in the inner cavity of the filling cylinder, the lower end of the filling cylinder is connected with the lower joint through the centralizing joint, and a plurality of filling ports are formed in the upper side of the filling cylinder.
Preferably, foretell sliding sleeve formula passageway control mechanism includes middle ball seat, lower dog, lower ball seat sealed pad, steel ball, lower ball seat, lower dog seat, the lower ball seat is connected through lower dog seat to the lower extreme of middle ball seat, installs lower dog in lower dog seat, installs the steel ball in lower ball seat, under the effect of lower dog and steel ball, makes liquid only one-way flow.
Preferably, the center of the middle ball seat is provided with a liquid drainage channel, and the outer wall of the middle ball seat is provided with a sealing step; and a lower ball seat sealing gasket is arranged between the lower block seat and the lower ball seat.
The invention relates to a pre-releasing normal well-washing sand-prevention completion pipe string, which adopts the technical scheme that: the device comprises a pre-releasing filling tool, a pre-releasing filling service mechanism, a hydraulic seat sealing mechanism, a filling mechanism, a sliding sleeve type channel control mechanism, a sleeve, a washpipe, an annular throttle valve, a sieve pipe, a high-pressure sealing rod, a high-temperature sealing cylinder and a floating shoe, wherein the pre-releasing filling tool is installed on the outer wall above the sleeve, the lower end of the sliding sleeve type channel control mechanism of the pre-releasing filling tool is connected with the washpipe of the inner cavity of the sleeve, the lower end of the washpipe is connected with the annular throttle valve, the lower end of the annular throttle valve is provided with the high-pressure sealing rod, the sieve pipe is connected to the lower side of the sleeve, the lower end of the sieve pipe is connected with.
Preferably, foretell annular space choke valve includes choke valve upper joint, center tube II, cylinder body, throttle spring, choke valve lower clutch, the lower extreme inner chamber of choke valve upper joint connect center tube II, the lower extreme outer wall connection cylinder body of choke valve upper joint, the annular space between cylinder body and the center tube II is equipped with throttle spring and choke valve, connects the choke valve lower clutch at the lower extreme of cylinder body and choke valve.
Preferably, foretell high temperature seal section of thick bamboo is including a sealing section of thick bamboo top connection, a sealing section of thick bamboo governing valve, high pressure seal II, a sealing section of thick bamboo lower clutch is connected to the lower extreme of a sealing section of thick bamboo top connection, is equipped with a sealing section of thick bamboo governing valve in a sealing section of thick bamboo lower clutch inner chamber, is equipped with high pressure seal II below a sealing section of thick bamboo governing valve.
The invention provides a method for realizing pre-releasing positive well-washing sand-prevention well completion by adopting a pre-releasing positive well-washing sand-prevention well completion pipe string, which comprises the following steps:
firstly, lower pipe column: connecting a floating shoe, a high-temperature sealing cylinder, a sieve tube and a sleeve on an outer pipe column at a wellhead and then sequentially putting the floating shoe, the high-temperature sealing cylinder, the sieve tube and the sleeve into a well; the inner part of the outer pipe column is provided with an inner pipe column, and the sequence of the inner pipe column is as follows: the high-pressure sealing rod, the annular throttle valve and the flushing pipe are connected with the upper part of the sleeve pipe and the corresponding thread at the lower part of the pre-releasing filling tool respectively, and then the pre-releasing filling tool is lowered to the underground design position by using an oil pipe;
secondly, a positive well-flushing construction method comprises the following steps: when a pipe column encounters resistance in the process of running into a well and needs positive well washing, well washing liquid is pumped into an oil pipe, the liquid enters a pre-releasing filling service mechanism through the oil pipe and then enters a sliding sleeve type channel control mechanism, the liquid enters a flushing pipe through a liquid discharge hole in a middle ball seat and then flows through an annular throttling valve and a high-pressure sealing insertion pipe to enter a floating shoe, when the pressure exceeds the opening pressure of the floating shoe, the liquid enters the annular space of a sieve pipe sleeve through the floating shoe and finally flows out from a sleeve opening, and the positive circulation well washing operation is completed;
thirdly, tool setting construction method: after the positive circulation well washing construction is finished, throwing a seat seal steel ball into the oil pipe, pressing the seat seal steel ball into the oil pipe after the seat seal steel ball falls to a middle ball seat on the sliding sleeve type channel control mechanism, and shearing a seat seal pin on the hydraulic seat seal mechanism when certain pressure is reached to finish tool seat seal;
fourthly, the construction method of back-off releasing before filling comprises the following steps: rotating the oil pipe forward until a throwing head on the pre-releasing filling service mechanism is separated from a central pipe I on the hydraulic seat sealing mechanism, then lifting the oil pipe upward to remove the connection relation between the inner pipe column and the outer pipe column, completing the construction operation of back-off releasing before filling, and at the moment, a switch valve on the filling mechanism ascends under the elastic force action of a switch valve spring, and closing a filling port;
fifthly, a circulating filling construction method: after the back-off releasing is completed before filling, lowering an oil pipe to the original position, lowering a switch valve on a filling mechanism under the action of a double-way body on a pre-releasing filling service mechanism, opening a filling port, starting filling, pumping filling liquid into the oil pipe, enabling the filling liquid to flow out through the filling port on the filling mechanism, blocking solid filling materials outside by a sieve pipe, enabling the filtered filling liquid to flow into an annular throttling valve from the sieve pipe, then entering a sliding sleeve type channel control mechanism through a ball seat, then flowing into an inner annular through a liquid discharge hole on an intermediate joint, then entering an outer sleeve, and finally flowing out from a sleeve port;
sixthly, a reverse circulation sand washing construction method comprises the following steps: after the designed filling discharge capacity is reached, the oil lifting pipe closes a switch valve on the filling mechanism through an elastic sleeve on the pre-releasing filling service mechanism, namely, a filling port is closed; then, the flushing fluid is pumped from the casing port, enters the internal annulus through the external annulus, enters the pre-releasing filling service mechanism through the fluid discharge hole in the middle ball seat, and finally flows out from the oil pipe port to form reverse circulation sand flushing, so that the purposes of cleaning the shaft and preventing sand blocking are achieved.
Compared with the prior art, the invention has the following beneficial effects:
the pre-releasing filling tool provided by the invention integrates functions of positive circulation well flushing, back-off releasing before filling, circulation filling, reverse circulation sand washing and the like, and can realize positioning of different construction procedures in the filling construction process by lifting and lowering the filling tool; the function of back-off releasing before filling is realized through a forward rotation pipe column; the functions of positive circulation well flushing, circulation filling and reverse circulation sand washing are realized through a sliding sleeve type channel control mechanism and an annular throttling valve;
after the pre-releasing filling tool seat is sealed, the tubular column does not need to be operated, an additional seal checking tool does not need to be matched, the external annular space can be directly pressed by a sleeve for seal checking, the operation is simple and convenient, the sleeve is in seal matching with the supporting tube on the pre-releasing filling service mechanism through the middle ball seat on the sliding sleeve type channel control mechanism, so that the sleeve pressure cannot enter the internal annular space, and the function of tool seal checking is realized;
the invention can open the filling channel, close the positive well-flushing channel, and establish the circulating filling backwashing channel; when the sliding sleeve type channel control mechanism moves downwards, the filling port is opened, the sealing of the middle ball seat and the supporting tube is released, the circular filling backwashing channel is opened, the lower ball seat enters the ball seat joint to form a sealing cavity, and the forward flushing well channel is closed;
in addition, the annular throttle valve is arranged, when the pressure outside the valve is larger than the pressure inside the valve by a certain value, the throttle valve moves upwards, the throttle channel is opened, and when the pressure outside the valve is reduced, the throttle valve moves downwards under the action of the throttle spring and the pressure inside the valve, and the throttle channel is closed; the invention can reduce the construction risk and improve the construction success rate.
Drawings
FIG. 1 is a schematic illustration of a monolithic pipe string in which the present invention is applied;
FIG. 2 is a schematic diagram of the construction of the pre-release filling tool of the present invention;
FIG. 3 is a schematic diagram of the structure of a pre-release filling service;
FIG. 4 is a schematic structural view of a hydraulic seating mechanism;
FIG. 5 is a schematic view of the structure of the filling mechanism;
FIG. 6 is a schematic structural view of a sliding sleeve type channel control mechanism;
FIG. 7 is a schematic view of the configuration of the annulus choke;
FIG. 8 is a schematic structural view of a sealing cartridge;
FIG. 9 is a schematic view of the construction of the float shoe;
in the upper diagram: upper joint 101, piston 102, hydraulic cylinder 103, upper ball seat 104, connecting inner tube 105, bearing 106, centering spring 107, thrower head 108, loose press cap 109, loose joint 110, filling tube 111, change-over joint 112, double pass body 113, ball seat bushing 114, connecting tube 115, support tube 116, elastic sleeve 117, ball seat joint 118, washpipe nipple 119, press ring 201, unset joint 202, set pin 203, lock ring 204, jacket 205, center tube i 206, unset pin 207, sleeve 208, high temperature rubber barrel 209, spacer ring 210, upper cone 211, slip cover 212, spring leaf 213, slip 214, inner cap 215, lower cone 216, seal barrel 301, adjusting ring 302, high pressure seal i 303, filling barrel 304, on-off valve 305, on-off valve spring 306, centering joint 307, lower joint 308, filling port 309, intermediate ball seat 401, lower stop 402, lower ball seat seal 403, steel ball 404, lower ball seat 405, The sealing device comprises a lower stop block seat 406, a sealing step 407, an upper throttling valve joint 701, a central pipe II 702, a cylinder body 703, a throttling spring 704, a throttling valve 705, a lower throttling valve joint 706, an upper sealing cylinder joint 1001, a sealing cylinder regulating valve 1002, a high-pressure sealing member II 1003, a lower sealing cylinder joint 1004, a guide cap 1101, a flow blocking plate 1102, a basket 1103, a sealing ball 1104, a compression spring 1105 and a sealing rod 1106.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Embodiment 1, referring to fig. 2, the pre-releasing filling tool according to the present invention includes a pre-releasing filling service mechanism 100, a hydraulic seating sealing mechanism 200, a filling mechanism 300, and a sliding sleeve type channel control mechanism 400, where the pre-releasing filling service mechanism 100 is connected to the hydraulic seating sealing mechanism 200 by a drop head 108 through a back-off thread, the lower end of the pre-releasing filling service mechanism 100 is in sealing fit with the sliding sleeve type channel control mechanism 400 through a shear pin, and the bottom of the hydraulic seating sealing mechanism 200 is connected to the filling mechanism 300;
a centering spring 107 is arranged at the upper part of a lost hand head 108 on the pre-releasing filling service mechanism 100, the upper part of the centering spring 107 is connected with a bearing 106, and under the double action of the bearing 106 and the centering spring 107, the extra pressure on a back-off thread during back-off releasing construction is reduced;
a groove is formed in the switch valve 305 on the filling mechanism 300, a boss is arranged on the elastic sleeve 117 on the pre-releasing filling service mechanism 100, and when the pipe column is lifted, the boss enters the groove to drive the switch valve 305 to move upwards so as to close the filling port 309;
a liquid discharge hole is formed in a middle ball seat 401 on the sliding sleeve type channel control mechanism 400, a lower stop 402 and a steel ball 404 are installed inside a lower ball seat 405 of the sliding sleeve type channel control mechanism 400, and the lower ball seat 405 enables liquid to flow only in a single direction under the action of the lower stop 402 and the steel ball 404.
Referring to fig. 3, the pre-releasing filling service mechanism 100 of the present invention includes an upper joint 101, a piston 102, a hydraulic cylinder 103, an upper ball seat 104, a connecting inner tube 105, a bearing 106, a centering spring 107, a releasing head 108, a movable pressure cap 109, a movable joint 110, a filling tube 111, a change-over joint 112, a double-pass body 113, a ball seat bushing 114, a connecting tube 115, a supporting tube 116, an elastic sleeve 117, a ball seat joint 118, and a flushing nipple 119, wherein the hydraulic cylinder 103 is installed outside the upper joint 101, the center of the upper joint 101 is connected to the upper ball seat 104, the piston 102 is disposed in an annulus between the hydraulic cylinder 103 and the upper ball seat 104, the lower end of the upper ball seat 104 is connected to the connecting inner tube 105, the outer wall of the connecting inner tube 105 is provided with the bearing 106, the centering spring 107, and the releasing head 108, and the centering; the lower end of the connecting inner pipe 105 is connected with a movable joint 110 through a movable pressing cap 109, the lower end of the movable joint 110 is connected with a filling pipe 111, the lower end of the filling pipe 111 is connected with a double-way body 113 through a buckle-changing joint 112, a ball seat bushing 114 is arranged in the inner cavity of the double-way body 113, the lower end of the double-way body is connected with a supporting pipe 116 through a connecting pipe 115, the lower end of the supporting pipe 116 is installed on a ball seat joint 118, an elastic sleeve 117 is arranged on the outer wall of the supporting pipe, and a pipe.
Referring to fig. 4, the hydraulic setting mechanism 200 of the present invention includes a press ring 201, a deblocking joint 202, a setting pin 203, a lock ring 204, a sheath 205, a central tube i 206, a deblocking pin 207, a sleeve 208, a high temperature rubber cylinder 209, a spacer ring 210, an upper cone 211, a slip cover 212, a spring plate 213, a slip 214, an inner protective cap 215, and a lower cone 216, wherein the inner side of the lower end of the press ring 201 is connected with the deblocking joint 202, the outer wall of the lower end is provided with the sheath 205, the inner side of the lower end of the deblocking joint 202 is connected with the central tube i 206, the lower end of the sheath 205 connects and fixes the sleeve 208, the outer side of the sleeve 208 is provided with the high temperature rubber cylinder 209 and the spacer ring 210, the lower side of the spacer ring 210 is provided with the upper cone 211, the lower side of the upper cone 211 is provided with the slip cover 212.
Referring to fig. 5, the filling mechanism 300 of the present invention includes a sealing cylinder 301, an adjusting ring 302, a high pressure seal i 303, a filling cylinder 304, a switch valve 305, a switch valve spring 306, a centering joint 307, and a lower joint 308, wherein the lower end of the sealing cylinder 301 is connected to the filling cylinder 304, the adjusting ring 302 and the high pressure seal i 303 are disposed in an inner cavity of the sealing cylinder 301, the switch valve 305 and the switch valve spring 306 are disposed in the inner cavity of the filling cylinder 304, the lower end of the filling cylinder 304 is connected to the lower joint 308 through the centering joint 307, and a plurality of filling ports 309 are disposed on the upper side of the filling cylinder 304.
Referring to fig. 6, the sliding sleeve type passage control mechanism 400 of the present invention includes an intermediate ball seat 401, a lower stopper 402, a lower ball seat gasket 403, a steel ball 404, a lower ball seat 405, and a lower stopper seat 406, wherein a lower end of the intermediate ball seat 401 is connected to the lower ball seat 405 through the lower stopper seat 406, the lower stopper 402 is installed in the lower stopper seat 406, the steel ball 404 is installed in the lower ball seat 405, and under the action of the lower stopper 402 and the steel ball 404, liquid can only flow in one direction.
Preferably, a liquid drainage channel is arranged in the center of the middle ball seat 401, and a sealing step 407 is arranged on the outer wall; a lower ball seat seal 403 is provided between the lower block seat 406 and the lower ball seat 405.
Referring to fig. 1, the technical scheme of the pre-releasing normal well-washing sand-prevention completion pipe string provided by the invention is as follows: the device comprises a pre-releasing filling tool 10, a pre-releasing filling service mechanism 100, a hydraulic seat sealing mechanism 200, a filling mechanism 300, a sliding sleeve type channel control mechanism 400, a sleeve 500, a washpipe 600, an annular throttle valve 700, a sieve pipe 800, a high-pressure sealing rod 900, a high-temperature sealing cylinder 1000 and a floating shoe 1100, wherein the pre-releasing filling tool 10 is installed on the outer wall above the sleeve 500, the lower end of the sliding sleeve type channel control mechanism 400 of the pre-releasing filling tool 10 is connected with the washpipe 600 in the inner cavity of the sleeve, the lower end of the washpipe 600 is connected with the annular throttle valve 700, the lower end of the annular throttle valve 700 is provided with the high-pressure sealing rod 900, the sieve pipe 800 is connected to the lower side of the sleeve 500, the lower end of the sieve pipe 800 is connected with the high-.
Referring to fig. 7, the annular throttling valve 700 of the invention comprises an upper throttling valve joint 701, a central pipe ii 702, a cylinder body 703, a throttling spring 704, a throttling valve 705 and a lower throttling valve joint 706, wherein the inner cavity of the lower end of the upper throttling valve joint 701 is connected with the central pipe ii 702, the outer wall of the lower end of the upper throttling valve joint 701 is connected with the cylinder body 703, the throttling spring 704 and the throttling valve 705 are arranged in the annular space between the cylinder body 703 and the central pipe ii 702, and the lower ends of the cylinder body 703 and the throttling valve 705 are connected with the.
Referring to fig. 8, the high-temperature sealing cartridge 1000 of the present invention includes a sealing cartridge upper joint 1001, a sealing cartridge regulating valve 1002, a high-pressure sealing member ii 1003, and a sealing cartridge lower joint 1004, wherein the lower end of the sealing cartridge upper joint 1001 is connected to the sealing cartridge lower joint 1004, the sealing cartridge regulating valve 1002 is disposed in an inner cavity of the sealing cartridge lower joint 1004, and the high-pressure sealing member ii 1003 is disposed below the sealing cartridge regulating valve 1002.
Referring to fig. 9, the float shoe 1100 of the present invention includes a guide cap 1101, a spoiler 1102, a flower basket 1103, a sealing ball 1104, a compression spring 1105, and a sealing rod 1106.
The invention provides a method for realizing pre-releasing positive well-washing sand-prevention well completion by adopting a pre-releasing positive well-washing sand-prevention well completion pipe string, which comprises the following steps:
firstly, lower pipe column: sequentially putting a floating shoe 1100, a high-temperature sealing cylinder 1000, a sieve tube 800 and a sleeve 500 on an outer pipe column into a well after well connection at a wellhead; the inner part of the outer pipe column is provided with an inner pipe column, and the sequence of the inner pipe column is as follows: the high-pressure sealing rod 900, the annular throttle valve 700 and the washpipe 600, and after the washpipe 600 and the upper part of the sleeve 500 are respectively in corresponding threaded connection with the lower part of the pre-releasing filling tool 10, the pre-releasing filling tool 10 is lowered to a downhole design position by using an oil pipe;
secondly, a positive well-flushing construction method comprises the following steps: when the pipe column encounters resistance in the process of running into the well and needs positive well washing, well washing liquid is pumped into an oil pipe, the liquid enters the pre-releasing filling service mechanism 100 through the oil pipe and then enters the sliding sleeve type channel control mechanism 400, the liquid enters the flushing pipe 600 through a liquid discharge hole in the middle ball seat 401, then flows through the annular throttling valve 700 and the high-pressure sealing insertion pipe 900 and enters the float shoe 1100, and when the pressure exceeds the opening pressure of the float shoe 1100, the liquid enters the annular space of the sieve pipe sleeve through the float shoe 1100 and finally flows out from the sleeve opening to finish the positive circulation well washing operation;
thirdly, tool setting construction method: after the positive circulation well washing construction is finished, a setting steel ball 404 is thrown into the oil pipe, after the steel ball 404 falls to the position of a middle ball seat 401 on the sliding sleeve type channel control mechanism 400, the steel ball is pressed into the oil pipe, and when a certain pressure is reached, a setting pin 203 on the hydraulic setting mechanism 200 is cut off, so that tool setting is finished;
fourthly, the construction method of back-off releasing before filling comprises the following steps: the oil pipe is rotated forwards until the hand losing head 108 on the pre-releasing filling service mechanism 100 is separated from the central pipe I206 on the hydraulic seat sealing mechanism 200, then the oil pipe is lifted upwards to release the connection relation between the inner and outer pipe columns, the back-off releasing construction operation before filling is completed, at the moment, the switch valve 305 on the filling mechanism 300 is lifted under the elastic force of the switch valve spring 306, and the filling port 309 is closed;
fifthly, a circulating filling construction method: after the back-off and the back-off before filling are finished, lowering the oil pipe to the original position, lowering the switch valve 305 on the filling mechanism 300 under the action of the through body 113 on the pre-back-off filling service mechanism 100, opening the filling port 309 to start filling, pumping filling liquid into the oil pipe, wherein the filling liquid flows out through the filling port 309 on the filling mechanism 300, solid filling is blocked by the sieve pipe 800, the filtered filling liquid flows into the annular throttling valve 700 from the sieve pipe 800, then enters the sliding sleeve type channel control mechanism 400 through the ball dropping seat 405, then flows into the inner annular through the liquid discharge hole on the middle joint 401, then enters the outer sleeve 500, and finally flows out from the sleeve port;
sixthly, a reverse circulation sand washing construction method comprises the following steps: after the designed filling displacement is reached, the oil lifting pipe closes the switch valve 305 on the filling mechanism 300 through the elastic sleeve 117 on the pre-releasing filling service mechanism 100, namely, closes the filling port 309; then, the flushing fluid is pumped from the casing port, enters the internal annulus through the external annulus, enters the pre-releasing filling service mechanism 100 through the liquid discharge hole in the middle ball seat 401, and finally flows out from the oil pipe port to form reverse circulation sand flushing, so that the purposes of cleaning the shaft and preventing sand blocking are achieved.
In addition, the tool setting construction method in the third step further comprises the following steps:
a. the tool seal checking construction method comprises the following steps: after the tool seat is sealed, directly pressing an annular space through a sleeve opening to test the seal;
the principle of the seal checking construction method is as follows: after the tool seat is sealed, the high-temperature rubber cylinder 209 on the hydraulic seat sealing mechanism 200 seals the external annulus (the annulus between the pre-releasing filling tool 10 and the external casing) to form a bottom sealing layer, then the liquid enters the internal annulus (the annulus between the pre-releasing filling service mechanism 100 and the hydraulic seat sealing mechanism 200) through the pressure ring 201 on the hydraulic seat sealing mechanism 200, and the annular is sealed due to the sealing step 407 between the middle ball seat 401 on the sliding sleeve type channel control mechanism 400 and the supporting pipe 116 on the pre-releasing filling service mechanism 100, so that the purpose of the seal checking tool is achieved. The seal checking construction method is simple to operate, convenient and reliable.
b. The construction method of the opening sliding sleeve type channel control mechanism comprises the following steps: and after the seal is tested to be qualified, closing the casing pipe for pressurizing, starting the oil pipe for pressurizing, cutting the shearing pin when a certain pressure is reached, moving the sliding sleeve type channel control mechanism 400 downwards to enable the lower ball seat 405 on the sliding sleeve type channel control mechanism 400 to fall into the ball seat joint 118 on the pre-releasing filling service mechanism 100, opening the filling channel, closing the well washing channel, and simultaneously establishing a circulating filling backwashing channel.
The principle of the construction method for opening the sliding sleeve type channel control mechanism is as follows: when the sliding sleeve type passage control mechanism 400 moves downwards, the filling port is opened, the sealing between the middle ball seat 401 and the support pipe 116 is released, the lower ball seat 405 enters the ball seat joint 118 to form a sealing cavity, the lower stop 402 and the steel ball 404 are installed inside the lower ball seat 405, and the lower ball seat sealing pad 403 is arranged outside the lower ball seat. The lower ball seat 405 enables the liquid to flow only in one direction under the action of the lower stop 402 and the steel ball 404, so that the circulating filling backwashing channel is opened, and the forward well-flushing channel is closed.
The above description is only a few of the preferred embodiments of the present invention, and any person skilled in the art may modify the above-described embodiments or modify them into equivalent ones. Therefore, the technical solution according to the present invention is subject to corresponding simple modifications or equivalent changes, as far as the scope of the present invention is claimed.
Claims (10)
1. A pre-release filling tool, characterized by: the device comprises a pre-releasing filling service mechanism (100), a hydraulic seat sealing mechanism (200), a filling mechanism (300) and a sliding sleeve type channel control mechanism (400), wherein the pre-releasing filling service mechanism (100) is connected with the hydraulic seat sealing mechanism (200) through a hand-releasing head (108) by using back-off threads, the lower end of the pre-releasing filling service mechanism (100) is in sealing fit with the sliding sleeve type channel control mechanism (400) through a shearing pin, and the bottom of the hydraulic seat sealing mechanism (200) is connected with the filling mechanism (300);
a centering spring (107) is arranged at the upper part of a throwing head (108) on the pre-releasing filling service mechanism (100), the upper part of the centering spring (107) is connected with a bearing (106), and under the double action of the bearing (106) and the centering spring (107), the extra pressure on a back-off thread during back-off releasing construction is reduced;
a groove is arranged on the switch valve (305) on the filling mechanism (300), a boss is arranged on the elastic sleeve (117) on the pre-releasing filling service mechanism (100), and when the pipe column is lifted, the boss enters the groove to drive the switch valve (305) to move upwards so as to close the filling opening;
a liquid discharge hole is formed in a middle ball seat (401) on the sliding sleeve type channel control mechanism (400), a lower stop block (402) and a steel ball (404) are installed inside a lower ball seat (405) of the sliding sleeve type channel control mechanism (400), and the lower ball seat (405) enables liquid to flow only in a single direction under the action of the lower stop block (402) and the steel ball (404).
2. The pre-release filling tool of claim 1, wherein: the pre-releasing filling service mechanism (100) comprises an upper joint (101), a piston (102), a hydraulic cylinder (103), an upper ball seat (104), a connecting inner pipe (105), a bearing (106), a centering spring (107), a releasing head (108), a movable pressing cap (109), a movable joint (110), a filling pipe (111), a buckle changing joint (112), a double-pass body (113), a ball seat lining (114), a connecting pipe (115), a supporting pipe (116), an elastic sleeve (117), a ball seat joint (118) and a pipe flushing nipple (119), wherein the hydraulic cylinder (103) is installed on the outer side of the upper joint (101), the upper ball seat (104) is connected to the center of the upper joint (101), the piston (102) is arranged in an annular space between the hydraulic cylinder (103) and the upper ball seat (104), the lower end of the upper ball seat (104) is connected with the connecting inner pipe (105), and the bearing (106) and the inner pipe (105, A centering spring (107) and a throwing head (108), wherein the centering spring (107) is arranged between the bearing (106) and the throwing head (108); connect the lower extreme of inner tube (105) and pass through loose joint cap (109) and connect loose joint (110), filling tube (111) is connected to the lower extreme of loose joint (110), the lower extreme of filling tube (111) is through becoming detain joint (112) and connecting bi-pass body (113), the inner chamber of bi-pass body (113) is equipped with ball seat bush (114), the lower extreme passes through connecting pipe (115) and connects stay tube (116), the lower extreme of stay tube (116) is installed at ball seat joint (118), the outer wall is equipped with elastic sleeve (117), towards pipe nipple (119) is installed to the bottom of ball seat joint (118).
3. The pre-release filling tool of claim 1, wherein: the hydraulic setting mechanism (200) comprises a pressing ring (201), a deblocking joint (202), a setting pin (203), a locking ring (204), a sheath (205), a central tube I (206), a deblocking pin (207), a sleeve (208), a high-temperature rubber cylinder (209), a spacer ring (210), an upper cone (211), a slip cover (212), a spring plate (213), a slip (214), an inner protective cap (215) and a lower cone (216), wherein the inner side of the lower end of the pressing ring (201) is connected with the deblocking joint (202), the outer wall of the lower end is provided with the sheath (205), the inner side of the lower end of the deblocking joint (202) is connected with the central tube I (206), the lower end of the sheath (205) is fixedly connected with the sleeve (208), the outer side of the sleeve (208) is provided with the high-temperature rubber cylinder (209) and the spacer ring (210), the lower side of the spacer ring (210) is provided with the upper cone (211), and the lower side, The anchor comprises a spring piece (213), slips (214) and a lower cone body (216), wherein the spring piece (213) is arranged between the slips (214) and a slip cover (212).
4. The pre-release filling tool of claim 1, wherein: filling mechanism (300) including sealed section of thick bamboo (301), adjusting ring (302), high pressure seal I (303), fill a section of thick bamboo (304), ooff valve (305), switching valve spring (306), right joint (307), lower clutch (308), the lower extreme of sealed section of thick bamboo (301) is connected and is filled a section of thick bamboo (304), the inner chamber of sealed section of thick bamboo (301) is equipped with adjusting ring (302) and high pressure seal I (303), fill a section of thick bamboo (304) inner chamber and be equipped with ooff valve (305) and switching valve spring (306), connect lower clutch (308) through right joint (307) at the lower extreme that fills a section of thick bamboo (304), the upside that fills a section of thick bamboo (304) is equipped with a plurality of filling ports (309).
5. The pre-release filling tool of claim 1, wherein: the sliding sleeve type channel control mechanism (400) comprises a middle ball seat (401), a lower stop block (402), a lower ball seat sealing gasket (403), a steel ball (404), a lower ball seat (405) and a lower stop block seat (406), wherein the lower end of the middle ball seat (401) is connected with the lower ball seat (405) through the lower stop block seat (406), the lower stop block (402) is installed in the lower stop block seat (406), the steel ball (404) is installed in the lower ball seat (405), and under the action of the lower stop block (402) and the steel ball (404), liquid can only flow in a single direction.
6. The pre-release filling tool of claim 5, wherein: a liquid drainage channel is arranged in the center of the middle ball seat (401), and a sealing step (407) is arranged on the outer wall of the middle ball seat; and a lower ball seat sealing gasket (403) is arranged between the lower block seat (406) and the lower ball seat (405).
7. A sand control completion string for use with the pre-release forward-flushing well of any of claims 1-6, characterized by: comprises a pre-releasing filling tool (10), a pre-releasing filling service mechanism (100), a hydraulic seat sealing mechanism (200), a filling mechanism (300), a sliding sleeve type channel control mechanism (400), a sleeve (500), a wash pipe (600), an annular throttle valve (700), a sieve pipe (800), a high-pressure sealing rod (900), a high-temperature sealing cylinder (1000) and a floating shoe (1100), a pre-releasing filling tool (10) is arranged on the outer wall above the sleeve (500), the lower end of a sliding sleeve type channel control mechanism (400) of the pre-releasing filling tool (10) is connected with a wash pipe (600) in the inner cavity of the sleeve, the lower end of the wash pipe (600) is connected with an annular throttle valve (700), the lower end of the annular throttle valve (700) is provided with a high-pressure sealing rod (900), the lower side of the casing (500) is connected with a sieve tube (800), the lower end of the sieve tube (800) is connected with a high-temperature sealing cylinder (1000), and the lower end of the high-temperature sealing cylinder (1000) is connected with a floating shoe (1100).
8. The pre-release normal well-flushing sand control completion string of claim 7, wherein: the annular throttle valve (700) comprises a throttle valve upper joint (701), a central pipe II (702), a cylinder body (703), a throttle spring (704), a throttle valve (705) and a throttle valve lower joint (706), wherein the central pipe II (702) is connected with a lower end inner cavity of the throttle valve upper joint (701), the lower end outer wall of the throttle valve upper joint (701) is connected with the cylinder body (703), the annular space between the cylinder body (703) and the central pipe II (702) is provided with the throttle spring (704) and the throttle valve (705), and the throttle valve lower joint (706) is connected with the lower ends of the cylinder body (703) and the throttle valve (705).
9. The pre-release normal well-flushing sand control completion string of claim 7, wherein: the high-temperature sealing barrel (1000) comprises a sealing barrel upper joint (1001), a sealing barrel adjusting valve (1002), a high-pressure sealing piece II (1003) and a sealing barrel lower joint (1004), wherein the lower end of the sealing barrel upper joint (1001) is connected with the sealing barrel lower joint (1004), the sealing barrel adjusting valve (1002) is arranged in the inner cavity of the sealing barrel lower joint (1004), and the high-pressure sealing piece II (1003) is arranged below the sealing barrel adjusting valve (1002).
10. A method of implementing a pre-release positive-flushing sand control completion using the pre-release positive-flushing sand control completion string of any of claims 7-9, comprising:
firstly, lower pipe column: connecting a floating shoe (1100), a high-temperature sealing cylinder (1000), a sieve tube (800) and a sleeve (500) on an outer pipe column at a wellhead and then sequentially putting the connected floating shoes, the high-temperature sealing cylinder and the sieve tube into a well; the inner part of the outer pipe column is provided with an inner pipe column, and the sequence of the inner pipe column is as follows: the high-pressure sealing rod (900), the annular throttle valve (700) and the washpipe (600), and after the washpipe (600) and the upper part of the sleeve (500) are respectively in corresponding threaded connection with the lower part of the pre-releasing filling tool (10), the pre-releasing filling tool is lowered to a downhole design position by using an oil pipe;
secondly, a positive well-flushing construction method comprises the following steps: when a pipe column encounters resistance in the process of descending the well and needs positive well flushing, well flushing liquid is pumped into an oil pipe, the liquid enters the pre-releasing filling service mechanism (100) through the oil pipe and then enters the sliding sleeve type channel control mechanism (400), the liquid enters the flushing pipe (600) through a liquid discharge hole in the middle ball seat (401), then flows through the annular throttling valve (700) and the high-pressure sealing insertion pipe (900) and enters the float shoe (1100), and when the pressure exceeds the opening pressure of the float shoe, the liquid enters the annular space of the sieve pipe sleeve through the float shoe (1100) and finally flows out from the sleeve opening, so that the positive circulation well flushing operation is completed;
thirdly, tool setting construction method: after the positive circulation well washing construction is finished, a setting steel ball is thrown into the oil pipe, after the setting steel ball falls to the position of a middle ball seat (401) on the sliding sleeve type channel control mechanism (400), the oil pipe is pressed, and when a certain pressure is reached, a setting pin (203) on the hydraulic setting mechanism (200) is cut off, so that the tool setting is finished;
fourthly, the construction method of back-off releasing before filling comprises the following steps: the oil pipe is positively rotated until a hand losing head (108) on the pre-releasing filling service mechanism (100) is separated from a central pipe I (206) on the hydraulic seat sealing mechanism (200), then the oil pipe is lifted up to release the connection relation between the inner pipe column and the outer pipe column, the back-off releasing construction operation before filling is completed, at the moment, a switch valve (305) on the filling mechanism (300) is lifted up under the elastic force action of a switch valve spring (306), and a filling port (309) is closed;
fifthly, a circulating filling construction method: after the back-off and the back-off are finished before filling, lowering the oil pipe to the original position, lowering a switch valve (305) on a filling mechanism (300) under the action of a double-way body (113) on a pre-back-off filling service mechanism (100), opening a filling port (309), starting filling, pumping filling liquid into the oil pipe, enabling the filling liquid to flow out through the filling port (309) on the filling mechanism (300), blocking solid filling materials outside by a sieve pipe (800), enabling the filtered filling liquid to flow into an annular throttling valve (700) from the sieve pipe (800), enabling the filtered filling liquid to enter a sliding sleeve type channel control mechanism (400) through a ball dropping seat (405), enabling the filtered filling liquid to flow into an inner annular through a liquid discharge hole on an intermediate joint (401), then entering an outer sleeve (500) and finally flowing out from a sleeve opening;
sixthly, a reverse circulation sand washing construction method comprises the following steps: after the designed filling displacement is reached, the oil lifting pipe closes the switch valve (305) on the filling mechanism (300) through the elastic sleeve (117) on the pre-releasing filling service mechanism (100), namely closes the filling port (309); then, the flushing fluid is pumped from the casing port, enters the internal annulus through the external annulus, enters the pre-releasing filling service mechanism (100) through a liquid discharge hole in the middle ball seat (401), and finally flows out from the oil pipe port to form reverse circulation sand flushing, so that the purposes of cleaning the shaft and preventing sand blocking are achieved.
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| CN202110397317.3A CN112796693B (en) | 2021-04-14 | 2021-04-14 | Pre-releasing filling tool and pre-releasing positive well-flushing sand-prevention well completion method |
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| CN202110397317.3A CN112796693B (en) | 2021-04-14 | 2021-04-14 | Pre-releasing filling tool and pre-releasing positive well-flushing sand-prevention well completion method |
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| CN117127946A (en) * | 2023-10-27 | 2023-11-28 | 山东巨辉石油科技有限公司 | Integral filling tool for underground operation of oil field |
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