CN101624904A - Open hole completion well sand resistant pipe string of sidetracking branch well and inserting type acid cleaning filling inner pipe string thereof - Google Patents
Open hole completion well sand resistant pipe string of sidetracking branch well and inserting type acid cleaning filling inner pipe string thereof Download PDFInfo
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- CN101624904A CN101624904A CN200910017893A CN200910017893A CN101624904A CN 101624904 A CN101624904 A CN 101624904A CN 200910017893 A CN200910017893 A CN 200910017893A CN 200910017893 A CN200910017893 A CN 200910017893A CN 101624904 A CN101624904 A CN 101624904A
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Abstract
The invention discloses an open hole completion well sand resistant pipe string of a sidetracking branch well and an inserting type acid cleaning filling inner pipe string thereof, which are used for the technologies of well completion sand resistance, acid cleaning and gravel filling of the sidetracking well and the sidetracking branch well in the oil industry. The completion well sand resistant pipe string comprises a release base seal mechanism which is provided with a releasing tool and an external hanging isolator; the release base seal mechanism is connected with an inner pipe string and an outer pipe string; the inner pipe string is connected with a check valve and a fluid-release device from bottom to top; the outer pipe string is connected with an acid cleaning filling valve, a sand filtering pipe, an open hole isolator and a cement injector from bottom to top in sequence; and a pipe spacing seal part is sealed between the inner pipe string and the outer pipe string. The inner pipe string and the outer pipe string are constructed in a fit way to complete cement injecting completion well and sand resistance. The acid cleaning filling inner pipe string comprises a plurality of flow blocking isolators which are connected with connecting pipes; and the bottoms of the flow blocking isolators are connected with an acid cleaning filling plug. The acid cleaning filling inner pipe string matches with the outer pipe string, so as to complete acid cleaning construction and gravel filling construction. By adopting the invention, workers can complete several constructions only by entering into the pipe string at one time in the sidetracking well and the sidetracking branch well.
Description
Technical field
The present invention relates to the underground equipment of oil exploitation, especially sidetracking Multilateral Wells barefoot completion sand control pipe and inserting type acid cleaning filling inner pipe post thereof are applicable to sidetracking Multilateral Wells completion sand-preventing process and follow-up pickling, gravel pack technology thereof.
Background technology
Exploitation field in petroleum industry, the sidetracking Multilateral Wells comprises sidetracked hole, Multilateral Wells and multilayer lateral branching well etc., be the integrated of horizontal well, sidetracked hole technology and development, purpose is the contact area that increases well bore and oil reservoir as far as possible, discharge stratum energy to a greater degree, improve output, improve the floood conformance volume, improve ultimate recovery.At present horizontal well, sidetracking branch hole drilling technology solve, but completion, well cementation, also prematurity is supporting for sand prevention integrated technology.The sidetracking Multilateral Wells mainly adopts small casing at present, and perforation completion behind the well cementing of cement is subjected to the well restriction can only adopt the method for chemical sand control or the littler sand screen of extension to carry out completion for loose sand oil accumulation.The chemical sand control period of validity is short, is not suitable for longer horizontal segment; Hang the littler sand screen weak effect that then recovers the oil, the sand control back well workover difficulty that lost efficacy.
Summary of the invention
The purpose of this invention is to provide sidetracking Multilateral Wells barefoot completion sand control pipe and inserting type acid cleaning filling inner pipe post thereof, solve the barefoot completion sand control of sidetracking Multilateral Wells and the technical barrier of follow-up construction thereof.
Can use the present technique solution for reaching above-mentioned purpose:
Sidetracking Multilateral Wells barefoot completion sand control pipe comprises a sealing mechanism of giving up, this mechanism has gives up and outer hanging packer, a sealing mechanism of giving up is connected with outer tubing string with interior tubing string, interior tubing string connects ball-and-seat and earial drainage device from bottom to top, outer tubing string connects acid cleaning filling valve, sand screen, open hole packer and cementing device from bottom to top successively, is sealed by seal between pipe between interior tubing string and the outer tubing string.Inside and outside tubing string coordinative construction is finished cementing completion and sand control.
Comprise the choked flow packer that several are connected by tube connector with the supporting use of sidetracking Multilateral Wells barefoot completion sand control pipe, the inserting type acid cleaning filling inner pipe post of finishing follow-up construction, connect the acid cleaning filling plug in its bottom.The acid cleaning filling inner pipe post cooperates with outer tubing string, finishes pickling construction and gravel pack construction.
The present invention compared with prior art has following significant effect: the present invention be have that hanging packer seat envelope, open hole packer seat envelope, inside and outside tubing string are given up, cementing well, sand control completion and the follow-up pickling and the integrated pipe column of the multiple function of gravel pack.In sidetracked hole and this complex structural well of sidetracking Multilateral Wells, one-trip string can be finished multinomial construction under only needing.Can not only reduce production costs, improve the construction safety degree, and when having been adopted after by the extraction layer, can on return second layer construction, the continuation sidetracking is exploited.Reach the economic aim of the highest oil recovery factor and least cost.
Description of drawings
Fig. 1 is an operating principle schematic diagram of the present invention.
Fig. 2 is the give up structural representation of a sealing mechanism of the present invention.
Fig. 3 is the structural representation of earial drainage device in cementing device and the interior tubing string in the outer tubing string of the present invention.
Fig. 4 is the structural representation of the ball-and-seat in the tubing string in the present invention.
Fig. 5 is the structural representation of the acid cleaning filling valve in the outer tubing string of the present invention.
Fig. 6 is the structural representation of inserting type acid cleaning filling inner pipe post of the present invention.
The specific embodiment
Below in conjunction with embodiment further detailed description is done in invention: referring to Fig. 1, sidetracking Multilateral Wells barefoot completion sand control pipe comprises a sealing mechanism of giving up, a sealing mechanism of giving up has gives up 1 and outer hanging packer 5, a sealing mechanism of giving up is connected with outer tubing string with interior tubing string, interior tubing string connects ball-and-seat 47 and earial drainage device 46 from bottom to top, outer tubing string connects acid cleaning filling valve 48, sand screen 29, open hole packer 27 and cementing device 45 from bottom to top successively, is sealed by seal between pipe between interior tubing string and the outer tubing string.Between each instrument, as connecting by tube connector between the parts such as ball-and-seat 47, earial drainage device 46, acid cleaning filling valve 48, open hole packer 27 and cementing device 45, tube connector is sleeve pipe or oil pipe.Referring to Fig. 4, ball-and-seat 47 comprises lower contact 25, spring 24, steel ball 23 and valve body 22, and the top inner chamber of valve body 22 is provided with inner conical surface, and steel ball 23 and spring 24 are installed between this inner conical surface and lower contact 25.Referring to Fig. 3, earial drainage device 46 comprises outer slip pipe 17, inner sliding pipe 18 and lower contact 20, and slip pipe 17 is provided with liquid flow hole 19 outside, and outer slip pipe 17 bottoms are connected with lower contact 20, outer slip pipe 17 tops and inner sliding pipe 18 anti-screwed connections, and its thread is left-handed button 16.The bottom cylindrical of inner sliding pipe 18 is provided with shoulder, and the diameter of this shoulder is greater than the big footpath or the title root footpath of screw thread in the outer slip pipe 17.Referring to Fig. 5, acid cleaning filling valve 48 comprises top connection 31, steel ball 32, screen casing 33, spring 35 and guide head 36, top connection 31 tops are connected with sand screen 29, the inner chamber of top connection 31 is provided with conical surface boss, screen casing 33 is connected with guide head 36 with top connection 31, steel ball 32 and spring 35 are installed in the screen casing 33 of top connection 31 conical surface boss below, and the middle part of conical surface boss is provided with sealing ring 30, and screen casing 33 is provided with screen casing hole 34.Referring to Fig. 3, cementing device 45 comprises spring 9, central tube 10, piston ring 11, joint ring 12, pressure ring 13 and outer fluid cylinder 15, and central tube 10 cylindricals are provided with shoulder, and the bottom body is provided with liquid flow hole 14, link to each other by tube connector with outer hanging packer 5 on the central tube 10, be connected with outer fluid cylinder 15 down.Spring 9, piston ring 11, joint ring 12 and pressure ring 13 are installed between central tube 10 cylindrical shoulders and the outer fluid cylinder 15 from top to bottom successively.The interior circle of piston ring 11 is provided with sealing ring 8.The liquid flow hole 14 of the liquid flow hole 19 of the outer slip pipe 17 in the earial drainage device 46 and the central tube 10 of cementing device 45 and the middle part inner chamber of outer fluid cylinder 15 are corresponding.Referring to Fig. 2, giving up 1 is provided with left-hand thread 3 and the liquid stream boss of giving up, design radial seat sealing of hole 4 and axial flowbore 2 on the liquid stream boss, and the left-hand thread 3 of giving up also is provided with axial flowbore 2, and radial seat sealing of hole 4 and axial flowbore 2 each intervals do not link.1 left-hand thread 3 design of giving up of giving up is connected with the outer hanging packer 5 that is provided with effluent hole 6 above liquid stream boss, and 1 the bottom of giving up is connected with the last tube connector of interior tubing string, and the bottom of outer hanging packer 5 is connected with the tube connector of outer tubing string.Referring to Fig. 6, comprise a plurality of choked flow packer and acid cleaning filling plugs 43 that link to each other with tube connector with the supporting use of sidetracking Multilateral Wells barefoot completion sand control pipe, the inserting type acid cleaning filling inner pipe post of finishing follow-up construction, the choked flow packer has only been drawn one in Fig. 6.Choked flow packer and tube connector are connected to become and reach tens meters and even 100 meters, 200 meters or longer tubing string, specifically look the distribution situation of down-hole oil reservoir and determine, connect acid cleaning filling plug 43 in the bottom of this tubing string.The choked flow packer comprises central tube 37, unidirectional leather cup 38, unidirectional leather cup sliding sleeve 39, spring 41, pressure ring 42.At least be milled with three spouts 40 on the central tube 37, the cylindrical of central tube 37 is with unidirectional leather cup 38, unidirectional leather cup sliding sleeve 39 and spring 41 successively, by the pressure ring 42 that is threaded.The bottom body of acid cleaning filling plug 43 is provided with by-pass prot 44, and its underpart body cooperates with top connection 31 inner chambers in the outer tubing string acid cleaning filling valve 48, by-pass prot 44 corresponding screen casings 33.
Seal comprises leather cup 7, down cup 21, goes up leather cup 26 and down cup 28 between pipe, also comprises the unidirectional leather cup 38 of acid cleaning filling inner pipe post, is one-way sealing.Last leather cup 7 and down cup 21, last leather cup 26 and the cementing device 45 of the corresponding outer tubing string of down cup 28 difference and the upper and lower of open hole packer 27 are connected on the interior tubing string; Unidirectional leather cup 38 is finished the sealing of acid cleaning filling inner pipe post and outer tubing string.
At first in the main hole of completion, bore a sidetracking branch uncased wellbore in the enforcement, from bottom to top the outer tubing string that parts such as acid cleaning filling valve 48, sand screen 29, open hole packer 27, cementing device 45 are formed is connected at well head then; The interior tubing string that parts such as ball-and-seat 47, earial drainage device 46, last leather cup 7, down cup 21, last leather cup 26, down cup 28 are formed connects and is lowered in the outer tubing string again.The outer hanging packer 5 that is connected with outer tubing string be connected with interior tubing string give up 1, before not giving up, be kit.Interior tubing string 1 is connected with giving up, outer tubing string is connected with outer hanging packer 5, be lowered in the sidetracking Multilateral Wells uncased wellbore behind the inside and outside tubing string tubing string in aggregates, seat envelope in 5 main holes in the sidetracking pit shaft of outer hanging packer has been filled up and has not been had the downhole production instrument that following one-trip string just can be finished multinomial construction in the present sidetracked hole.
When the present invention uses at the scene, undertaken by following operation sequence:
Cementing completion and sand control construction: outer tubing string and interior tubing string are connected to the order illustrated of Fig. 5 by Fig. 2, and design attitude in the lower going-into-well is suppressed power from oil pipe, and fluid power is 5 envelopes of hanging packer outside oil pipe makes through radial seat sealing of hole 4.Simultaneously fluid power makes 27 envelopes of open hole packer by the last leather cup 26 on interior tubing string and the interior tubing string, liquid flow hole between the down cup 28.The good back of seat positive rotation tubing string make give up 1 and outer hanging packer 5 by the left-hand thread 3 of the giving up disengagement of giving up.Relatively rotating and axial displacement of the left-handed button 16 of outer slip pipe 17 by earial drainage device 46 and inner sliding pipe 18 moved on the inner sliding pipe 18 simultaneously, and its lower surface moves on to liquid flow hole 19 tops, and liquid flow hole 19 is exposed.Pump into cement slurry cementing from tubing string this moment, and cement paste is pushed the piston ring 11 of cementing device 45 open by the liquid flow hole 19 of earial drainage device 46, enters casing annulus, and effluent hole 6 and liquid flow hole 2 by outer hanging packer 5 return the oil jacket annular space.Suppress from the oil jacket annular space after annotating capacity, fluid power goes out the backwash of superfluous water mud to tubing string through last leather cup 7, liquid flow hole 19 from liquid flow hole 2.Then interior tubing string from outer tubing string completion is proposed.Sand screen 29 in the outer tubing string is stayed the down-hole, plays the sand control effect.
Pickling construction: during pickling pickling plug 43 is connected into the inserting type acid cleaning filling inner pipe post with several by the choked flow packer that tube connector is connected, in the lower going-into-well to the shaft bottom.Press down tubing string, the pickling plug 43 of inserting type acid cleaning filling inner pipe post is backed down steel ball 32, acid cleaning filling valve 48 is opened, pump into pickle from the oil jacket annular space then, pickle enters the outer annular space of sand screen 29 from the oil jacket annular space under the guiding of several choked flow packers, enter acid cleaning filling inner pipe post inner chamber and oil pipe returns ground from the screen casing hole 34 of acid cleaning filling valve 48 through the by-pass prot 44 of pickling plug 43 again.During this sand screen 29 outer mud cake and mud are cleaned up.
Gravel pack construction: from oil pipe gravel slurry is pumped into, enter the annular space of sand screen 29 and uncased wellbore through acid cleaning filling inner pipe post inner chamber and by-pass prot 44 and screen casing hole 34, gravel is stayed the uncased wellbore annular space by filter, and liquid then enters the oil jacket annular space and returns ground.After filling finished, backwash went out unnecessary gravel, proposed the acid cleaning filling inner pipe post and got final product completion.
Claims (13)
1, sidetracking Multilateral Wells barefoot completion sand control pipe, comprise a sealing mechanism of giving up, this mechanism has gives up (1) and outer hanging packer (5), a sealing mechanism that it is characterized in that giving up is connected with outer tubing string with interior tubing string, interior tubing string connects ball-and-seat (47) and earial drainage device (46) from bottom to top, outer tubing string connects acid cleaning filling valve (48), sand screen (29), open hole packer (27) and cementing device (45) from bottom to top successively, is sealed by seal between pipe between interior tubing string and the outer tubing string.
2, sidetracking Multilateral Wells barefoot completion sand control pipe according to claim 1, it is characterized in that ball-and-seat (47) comprises lower contact (25), spring (24), steel ball (23) and valve body (22), the top inner chamber of valve body (22) is provided with inner conical surface, and steel ball (23) and spring (24) are installed between this inner conical surface and lower contact (25).
3, sidetracking Multilateral Wells barefoot completion sand control pipe according to claim 1, it is characterized in that earial drainage device (46) comprises outer slip pipe (17), inner sliding pipe (18) and lower contact (20), slip pipe (17) is provided with liquid flow hole (19) outside, outer slip pipe (17) bottom is connected with lower contact (20), outer slip pipe (17) top and the anti-screwed connection of inner sliding pipe (18).
4, sidetracking Multilateral Wells barefoot completion sand control pipe according to claim 3, the bottom cylindrical that it is characterized in that inner sliding pipe (18) is provided with shoulder, the diameter of this shoulder is greater than the big footpath of the interior screw thread of outer slip pipe (17), and inner sliding pipe (18) is left-handed button (16) with the thread of outer slip pipe (17).
5, sidetracking Multilateral Wells barefoot completion sand control pipe according to claim 1, it is characterized in that acid cleaning filling valve (48) comprises top connection (31), steel ball (32), screen casing (33), spring (35) and guide head (36), top connection (31) top is connected with sand screen (29), and the inner chamber of top connection (31) is provided with conical surface boss; Screen casing (33) is connected with guide head (36) with top connection (31); Steel ball (32) and spring (34) are installed in the screen casing (33) of top connection (31) conical surface boss below.
6, sidetracking Multilateral Wells barefoot completion sand control pipe according to claim 1, it is characterized in that cementing device (45) comprises spring (9), central tube (10), piston ring (11), joint ring (12), pressure ring (13) and outer fluid cylinder (15), central tube (10) cylindrical is provided with shoulder, the bottom body is provided with liquid flow hole (14), central tube (10) is gone up and is linked to each other by tube connector with outer hanging packer (5), is connected with outer fluid cylinder (15) down; Spring (9), piston ring (11), joint ring (12) and pressure ring (13) are installed between central tube (10) cylindrical shoulder and the outer fluid cylinder (15) from top to bottom successively.
7, sidetracking Multilateral Wells barefoot completion sand control pipe according to claim 1 is characterized in that the liquid flow hole (19) of the outer slip pipe (17) in the earial drainage device (46) is corresponding with the middle part inner chamber of liquid flow hole (14) and outer fluid cylinder (15).
8, sidetracking Multilateral Wells barefoot completion sand control pipe according to claim 1, it is characterized in that giving up (1) be provided with the left-hand thread of giving up (3) and liquid stream boss, design radial seat sealing of hole (4) and axial flowbore (2) on the liquid stream boss, the left-hand thread (3) of giving up also is provided with axial flowbore (2), and radial seat sealing of hole (4) and axial flowbore (2) each interval do not link.
9, according to claim 1 or 8 described sidetracking Multilateral Wells barefoot completion sand control pipes, the left-hand thread of giving up (3) design of (1) of it is characterized in that giving up is connected with the outer hanging packer (5) that is provided with effluent hole (6) above liquid stream boss, the give up bottom of (1) is connected with the last tube connector of interior tubing string, and the bottom of outer hanging packer (5) is connected with the tube connector of outer tubing string.
10, sidetracking Multilateral Wells barefoot completion sand control pipe according to claim 1, it is characterized in that seal comprises leather cup (7), down cup (21) between pipe, go up leather cup (26) and down cup (28), last leather cup (7) and down cup (21), go up leather cup (26) and down cup (28) upper and lower of corresponding outer tubing string cementing device (45) and open hole packer (27) respectively, be connected on the interior tubing string.
11, be exclusively used in the inserting type acid cleaning filling inner pipe post of claim 1 sidetracking Multilateral Wells barefoot completion sand control pipe, it is characterized in that this tubing string comprises the choked flow packer that several are connected by tube connector, connect acid cleaning filling plug (43) in its bottom.
12, inserting type acid cleaning filling inner pipe post according to claim 11, it is characterized in that the choked flow packer comprises central tube (37), unidirectional leather cup (38), unidirectional leather cup sliding sleeve (39), spring (41) and pressure ring (42), at least be milled with three spouts (40) on the central tube (37), the cylindrical of central tube (37) is with unidirectional leather cup (38), unidirectional leather cup sliding sleeve (39) and spring (41) successively, by the pressure ring that is threaded (42).
13, inserting type acid cleaning filling inner pipe post according to claim 11, the bottom body that it is characterized in that acid cleaning filling plug (43) is provided with by-pass prot (44), its underpart body cooperates the corresponding screen casing of by-pass prot (44) (33) with top connection (31) inner chamber of outer tubing string acid cleaning filling valve (48).
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| CN 200910017893 CN101624904B (en) | 2009-08-14 | 2009-08-14 | Open hole completion well sand resistant pipe string of sidetracking branch well and inserting type acid cleaning filling inner pipe string thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200910017893 CN101624904B (en) | 2009-08-14 | 2009-08-14 | Open hole completion well sand resistant pipe string of sidetracking branch well and inserting type acid cleaning filling inner pipe string thereof |
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| CN101624904B CN101624904B (en) | 2012-07-25 |
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