CN101818619A - Well cementation and completion structure and process for cased branch well with temporarily-sealed opening - Google Patents

Well cementation and completion structure and process for cased branch well with temporarily-sealed opening Download PDF

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Publication number
CN101818619A
CN101818619A CN 201010131662 CN201010131662A CN101818619A CN 101818619 A CN101818619 A CN 101818619A CN 201010131662 CN201010131662 CN 201010131662 CN 201010131662 A CN201010131662 A CN 201010131662A CN 101818619 A CN101818619 A CN 101818619A
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China
Prior art keywords
well
sleeve pipe
main
perforate
finder
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CN 201010131662
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Chinese (zh)
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CN101818619B (en
Inventor
张承武
李登前
王文斌
王兴建
陈建刚
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CNPC Chuanqing Drilling Engineering Co Ltd
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CNPC Chuanqing Drilling Engineering Co Ltd
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Priority to CN2010101316624A priority Critical patent/CN101818619B/en
Publication of CN101818619A publication Critical patent/CN101818619A/en
Application granted granted Critical
Publication of CN101818619B publication Critical patent/CN101818619B/en
Expired - Fee Related legal-status Critical Current
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Abstract

The invention discloses a well cementation and completion structure and a process for a cased branch well with a temporarily-sealed opening. An upper branch casing of the well cementation and completion structure comprises a bent guide shoe positioned in an upper branch well, an upper branch tail pipe connected with the bent guide shoe and a perforated casing connected with the upper branch tail pipe, wherein the end, connected with the upper branch tail pipe, of the perforated casing, is positioned in the upper branch well, while the other end is fixed in a main casing; a sealing material is arranged in the opening of the perforated casing; the main casing is arranged in a main well; a lower branch casing is arranged in a lower branch well; a guide sleeve, an orientator and a whipstock are arranged in the main casing; the guide sleeve is positioned above a joint where the perforated casing and the main sleeve are fixed; the orientator is positioned above the lower branch casing; the whipstock is positioned above the orientator; and a filler is arranged in an inner through hole of the orientator. The structure and the process have the advantages of realization of quick well completion of a plurality of branch wells, easy tail pipe perforation operation, high perforation quality, no damage to upper well walls in the perforation of the tail pipe and no need of casing off and fishing lining pipes.

Description

Temporary sealed opening sleeve pipe Multilateral Wells well cementation completion structure and technology
Technical field
The present invention relates to the well cementation completion structure and the method for a kind of oil, gas field Multilateral Wells, relate in particular to a kind of temporary sealed opening sleeve pipe Multilateral Wells well cementation completion structure and technology.
Background technology
At present, the Multilateral Wells technology is one can reduce the oil and gas development cost, improves the advanced technology of the rate of oil and gas recovery, but is a drilling technology that difficulty is very big, and along with the high speed development of drilling technology, the utilization of branch hole drilling technology will be more and more widely.For example China Patent No. 200410004401.0 discloses the perforate of oil-gas branch well, deflector equipment and perforate, the reentry method, its applying date is on February 19th, 2004, notice of authorization day is on June 21st, 2006, the perforate of its oil-gas branch well, deflector equipment comprises Multilateral Wells casing pipe hole opening device and Multilateral Wells deflector equipment, Multilateral Wells casing pipe hole opening device is made up of two parts: first comprises tieback device and the directional bond that is fixed on the tieback device, and second portion comprises directed stop, guide rail on the directed stop, helicoid hydraulic motor, back-up block on the helicoid hydraulic motor, and the drilling tool of helicoid hydraulic motor tail end; The Multilateral Wells deflector equipment comprises and connects pipe nipple, connects the spacing collar on the pipe nipple and connect pipe nipple and the outer guide cylinder of spacing collar.
But realize the level Four completion both at home and abroad, the technology that can satisfy window structure stability, bifurcation sealing and branch well hole reentry mainly contains: the tail pipe perforate completion technique of (1) Vad good fortune.What it adopted is that branch joint is hanging to main borehole, again to the branch joint perforate, gets through the passage with main borehole behind the cementing well.The problem that adopts this structure and method to exist is: tail pipe perforate difficulty is big, and perforate is of poor quality; During the tail pipe perforate top borehole wall there is destruction.(2) shell Hughes's wall hook formula perforate sleeve pipe is introduced in the Liaohe River.Cause the problem of cementing quality difference during its branch joint solid water mud for fear of the pre-drilled cavity short circuit, in the pre-drilled cavity sleeve pipe, be lowered to bushing pipe again, the shutoff pre-drilled cavity.The problem that adopts this structure and method to exist is: need be lowered to and salvage bushing pipe; Need repair window and master, branch well hole.
In sum, realize the level Four completion both at home and abroad, under the condition that satisfies window structure stability, bifurcation sealing and branch well hole reentry, all also have more problem.
Summary of the invention
The objective of the invention is to overcome existing the problems referred to above that realize that the level Four completion exists, a kind of temporary sealed opening sleeve pipe Multilateral Wells well cementation completion structure and technology are provided, the present invention can realize the quick completion of multilateral well, guaranteeing to improve the Multilateral Wells cementing quality under the prerequisite that window is stable, bifurcated seals and well is reentried, and tail pipe perforate easy operating, perforate quality height, during the tail pipe perforate top borehole wall is not destroyed, do not need to be lowered to and to salvage bushing pipe, do not need to repair window and master, branch well hole yet.
For achieving the above object, the technical solution used in the present invention is as follows:
A kind of temporary sealed opening sleeve pipe Multilateral Wells well cementation completion structure, comprise main borehole, main sleeve pipe, the inferior division well, the inferior division sleeve pipe, whipstock, top set's well, fairlead, it is characterized in that: also comprise the top set's sleeve pipe that is arranged in top set's well, described top set sleeve pipe comprises the curved guide shoe that is positioned at top set's well, top set's tail pipe that is connected with curved guide shoe and the perforate sleeve pipe that is connected with the top set tail pipe, the link that the perforate sleeve pipe is connected with the top set tail pipe is positioned at top set's well, the other end is fixed in the main sleeve pipe, is provided with sealing compound in the perforate of perforate sleeve pipe; Main sleeve pipe is arranged in the main borehole, the inferior division sleeve pipe is arranged in the inferior division well, be provided with fairlead, finder and whipstock in the main sleeve pipe, fairlead is positioned at the top of perforate sleeve pipe and main sleeve pipe bearing, finder is positioned at inferior division sleeve pipe top, whipstock is positioned at the finder top, is provided with inserts in the inner via hole of finder.
The packing element of described finder and slip seals, finder are anchored on the inwall of main sleeve pipe.
The packing element of described whipstock and slip seals, whipstock are anchored on the inwall of main sleeve pipe.
Described top set tail pipe is connected with the perforate sleeve pipe through swivel joint, and curved guide shoe, top set's tail pipe, swivel joint and perforate sleeve pipe are threaded successively.
Described perforate sleeve pipe one end hangs on the main sleeve pipe of top set's well and main sleeve pipe connection place lower edge through the wall hook on the perforate sleeve pipe, and the other end hangs on the inwall of main sleeve pipe by slip spider.
A kind of temporary sealed opening sleeve pipe Multilateral Wells well cementation well-completing process is characterized in that, comprises the steps:
A, bore main borehole, in main borehole, become owner of sleeve pipe down, the interior cementing well of the annular space of main borehole and main sleeve pipe;
B, brill inferior division well are lowered to the inferior division sleeve pipe, cementing well in the annular space of inferior division well and inferior division sleeve pipe in the inferior division well;
C, in main borehole, be lowered to finder, make finder be positioned at inferior division sleeve pipe top, measure the orientation of finder again;
D, before going into the well according to the orientation of finder deflecting surface angle by the design orientation adjustment whipstock of top set's well, adjust and be lowered to whipstock after finishing, make whipstock be positioned at the finder top;
E, by whipstock guiding drilling tool, window sidetracking top set well, salvaging whipstock top set's well drilling well is finished after;
F, in top set's well, be lowered to the top set's sleeve pipe that constitutes by curved guide shoe, top set's tail pipe, swivel joint, perforate sleeve pipe;
G, go up the swivel joint of lower tubular column by pressed status and relatively rotate, make wall hook on the perforate sleeve pipe rotate to sealed opening direction on the perforate sleeve pipe automatically over against the bottom main borehole;
Cementing well in the annular space of h, top set's sleeve pipe and top set's well;
I, brill are got through main borehole and inferior division well except the sealing compound of borehole jack pipe and the inserts of finder;
J, be lowered to fairlead, make fairlead be positioned at perforate sleeve pipe upper end, the gathering sill of fairlead is corresponding with the window of top set's well, determines that again the fairlead and the angle of perforate sleeve pipe concern that the completion of cementing the well is finished.
The present invention also comprises the step that enters the inferior division well with straight seeker guiding later stage working string.
The present invention also comprises the gathering sill position of the feather key of rotary steering joint to fairlead, makes the window of curved guide shoe facing to top set's well, later stage working string guiding is entered the step of top set's well.
Described cementing well is that clear water is annotated in first cementing again in the sleeve pipe, injects clear water and makes cement be positioned at the annular space of well and sleeve pipe, and sleeve pipe and well are consolidated.
In the described f step, with the beneath window of sleeve pipe elder generation of top set down to top set's well, upwards carry again and positive tube post, curved guide shoe is adjacent in main borehole one side by elasticity, when curved guide shoe is just going to the window's position of top set's well, the elbow of curved guide shoe enters the window of top set's well, and top set's sleeve pipe guiding is entered in top set's well.
Employing the invention has the advantages that:
One, well cementation well-completing process of the present invention can be realized the quick completion of multilateral well, guaranteeing to improve the Multilateral Wells cementing quality under the prerequisite that window is stable, bifurcated seals and well is reentried, and tail pipe perforate easy operating, perforate quality height, during the tail pipe perforate top borehole wall is not destroyed, do not need to be lowered to and to salvage bushing pipe, do not need to repair window and master, branch well hole yet.
Two, among the present invention, it is that sealing compound temporarily seals that the perforate of the perforate sleeve pipe in top set's well is easy to bore the material that removes, and can not form short circuit from perforate during perforate sleeve pipe cementing well in top set's well and reflux, and has guaranteed the cementing quality of top set's well.
Three, among the present invention, the inner via hole of finder is easy to bore the temporary transient shutoff of the material that removes, and avoids cement to deposit to main borehole during the branch joint cementing well.
Four, among the present invention, bore except the sealing compound of borehole jack pipe and the inserts in the finder, and unnecessary cement, can get through the passage of main borehole and inferior division well, main borehole and inferior division well are communicated with simple and convenient, easy operating.
Five, the present invention goes at least three branch well holes, and because main borehole and inferior division well are easy to be communicated with, efficient is high.
Six, the present invention can utilize the gathering sill of fairlead and curved guide shoe to add feather key guiding later stage working string, can realize that the selectivity of a plurality of branches enters, and the disposable seat of fairlead is hung and can forever be used, and can reduce drilling cost, improves the life-span of well.
Seven, among the present invention, the packing element of finder and whipstock and slips all are hermetically-sealed constructions, all are anchored on the inwall of main sleeve pipe, adopt this hermetically-sealed construction to guarantee sealing between branch joint and the main borehole.
Eight, among the present invention, top set's tail pipe is connected with the perforate sleeve pipe through swivel joint, curved guide shoe, top set's tail pipe, swivel joint and perforate sleeve pipe are threaded successively, adopt to be threaded successively and be convenient to be connected, adopt swivel joint, lower tubular column can relatively rotate on pressed status makes, and makes perforate direction on the perforate sleeve pipe over against the bottom main borehole, is convenient to get through main borehole and inferior division well.
Nine, among the present invention, perforate sleeve pipe one end hangs on the main sleeve pipe of top set's well and main sleeve pipe connection place lower edge through the wall hook on the perforate sleeve pipe, and the other end hangs over by slip spider on the inwall of main sleeve pipe, installs fast, has improved well cementation completion speed.
Ten, among the present invention, the slips anchoring of fairlead adopts the connected mode of grappling on the inwall of main sleeve pipe, make the position of fairlead more fixing, has improved cementing quality.
Description of drawings
Fig. 1 is the structural representation of the window sidetracking of drilling well, setting of casing, cementing well and top set's well of main borehole of the present invention and inferior division well
Fig. 2 is the setting of casing of top set of the present invention well, the structural representation of cementing well
The structural representation that Fig. 3 removes sealing compound and underfill material and fairlead is set for the present invention bores
1, main borehole, 2, main sleeve pipe, 3, the inferior division well, 4, the inferior division sleeve pipe, 5, finder, 6, whipstock, 7, top set's well, 8, the perforate sleeve pipe, 9, swivel joint, 10, top set's tail pipe, 11, curved guide shoe, 12, fairlead.
The specific embodiment
A kind of temporary sealed opening sleeve pipe Multilateral Wells well cementation completion structure, comprise main borehole 1, main sleeve pipe 2, inferior division well 3, inferior division sleeve pipe 4, whipstock 6, top set's well 7, fairlead 12, also comprise the top set's sleeve pipe that is arranged in top set's well 7, top set's sleeve pipe comprises the curved guide shoe 11 that is positioned at top set's well 7, top set's tail pipe 10 that is connected with curved guide shoe 11 and the perforate sleeve pipe 8 that is connected with top set tail pipe 10, perforate sleeve pipe 8 is positioned at top set's well 7 with the link that top set tail pipe 10 is connected, the other end is fixed in the main sleeve pipe 2, is provided with sealing compound in the perforate of perforate sleeve pipe 8; Main sleeve pipe 2 is arranged in the main borehole 1, be cementing concrete between main sleeve pipe 2 and the main borehole 1, inferior division sleeve pipe 4 is arranged in the inferior division well 3, be cementing concrete between inferior division sleeve pipe 4 and the inferior division well 3, be provided with fairlead 12, finder 5 and whipstock 6 in the main sleeve pipe 2, fairlead 12 is positioned at the top of perforate sleeve pipe 8 and main sleeve pipe 2 bearings, finder 5 is positioned at inferior division sleeve pipe 4 tops, whipstock 6 is positioned at finder 5 tops, being provided with inserts in the inner via hole of finder 5, is cementing concrete between top set's sleeve pipe and the top set's well 7.
Among the present invention,, and finder 5 is anchored on the inwall of main sleeve pipe 2 packing element and the slip seals of finder 5.The packing element and the slips of whipstock 6 also seal, and whipstock 6 are anchored on the inwall of main sleeve pipe 2.
Top set's tail pipe 10 is connected with perforate sleeve pipe 8 through swivel joint 9, and curved guide shoe 11, top set's tail pipe 10, swivel joint 9 and perforate sleeve pipe 8 are threaded successively.
Perforate sleeve pipe 8 one ends hang on the main sleeve pipe 2 of top set's well 7 and main sleeve pipe 2 connection place lower edges through the wall hook on the perforate sleeve pipe 8, and the other end hangs on the inwall of main sleeve pipe 2 by slip spider.With the slips anchoring of fairlead 12 on the inwall of main sleeve pipe 2.
Below the present invention is done to launch explanation:
The present invention includes main borehole 1, main sleeve pipe 2, inferior division well 3, inferior division sleeve pipe 4, finder 5, whipstock 6, top set's well 7, perforate sleeve pipe 8, swivel joint 9, top set's tail pipe 10, curved guide shoe 11, fairlead 12.Main sleeve pipe 2 is in main borehole 1, cementing well in the annular space of main sleeve pipe 2 and main borehole 1, inferior division sleeve pipe 4 is in inferior division well 3, cementing well in the annular space of inferior division sleeve pipe 4 and inferior division well 3, finder 5 is seated in above the inferior division sleeve pipe 4, the packing element of finder 5 and slip seals also are anchored on the inwall of main sleeve pipe 2, whipstock 6 is seated in above the provisional filling finder 5, the packing element of whipstock 6 and slips also seal and are anchored on the inwall of main sleeve pipe 2, by whipstock 6 guiding drilling tools, take out whipstock 6 after the window sidetracking top set well 7, curved guide shoe 11, top set's tail pipe 10, swivel joint 9, perforate sleeve pipe 8 is from bottom to up successively by being threaded, constitute top set's sleeve pipe, down in top set's well 7, wall hook on the perforate sleeve pipe 8 hangs over lower window edge, the inwall that hangs over main sleeve pipe 2 is sat in the upper end by slips, cementing well in the annular space of top set's sleeve pipe and top set's well 7, fairlead 12 is seated in perforate sleeve pipe 8 upper ends, and the slips anchoring of fairlead 12 is at the inwall of main sleeve pipe 2.
Adopt the present invention's well-completing process flow process of cementing the well as follows:
(1) bores main borehole 1, become owner of sleeve pipe 2, the interior cementing well of the annular space of main borehole 1 and main sleeve pipe 2 under main borehole 1 in, be that clear water is annotated in first cementing again in the sleeve pipe during well cementation, clear water replaces cement to the annular space of well and sleeve pipe, and sleeve pipe and well are consolidated, and below well cementation herewith.
(2) bore inferior division well 3, be lowered to inferior division sleeve pipe 4 in inferior division well 3, inferior division sleeve pipe 4 is sat and is hung over main sleeve pipe 2 lower ends, cementing well in the annular space of inferior division well 3 and inferior division sleeve pipe 4.
(3) be lowered to finder 5 in main borehole 1, the inner via hole of finder is the sealing compound temporary filling with being easy to bore the material that removes, and is seated in above the inferior division sleeve pipe 4, and the packing element of finder 5 and slip seals also are anchored on the inwall of main sleeve pipe 2, measure the orientation of finder 5.For example adopt plastics to fill, sealing compound has a lot, and those skilled in the art can make correct selection according to actual conditions, and the bearing measurement of finder 5 can be according to existing assay method.
(4) whipstock 6 according to the orientation of finder 5 angle by the design orientation adjustment deflecting surface of top set's well, is lowered to whipstock 6 before going into the well, and is seated in above the finder 5, and the packing element of whipstock 6 and slips also seal and be anchored on the inwall of main sleeve pipe 2.Angle adjustment those skilled in the art of deflecting surface can realize in conjunction with prior art according to the present techniques scheme.
(5) by whipstock 6 guiding drilling tools, window sidetracking top set well 7 is salvaged whipstock 6 again.
(6) in top set's well 7, be lowered to the top set's sleeve pipe that constitutes by curved guide shoe 11, top set's tail pipe 10, swivel joint 9, perforate sleeve pipe 8, earlier down to beneath window, the positive tube post in limit is carried on slowly in the limit then, curved guide shoe 11 is adjacent to a side in well by elasticity, in case curved guide shoe 11 goes to the window's position, elbow just enters window, and top set's sleeve pipe guiding is entered in top set's well 7.
(7) swivel joint 9 lower tubular column on pressed status allows relatively rotates, and the wall hook on the perforate sleeve pipe 8 is rotated automatically, hangs over lower window edge, and the perforate direction on the perforate this moment sleeve pipe 8 is over against the bottom main borehole.
(8) cementing well in the annular space of top set's sleeve pipe and top set's well 7, because the perforate on the perforate sleeve pipe 8 is temporarily sealed, can not reflux by perforate during cementing forms short circuit, has guaranteed the cementing quality of top set's sleeve pipe.
(9) bore except the sealing compound of borehole jack pipe 8 and the inserts in the finder 5, and unnecessary cement, get through the passage of main borehole and inferior division.Sealing compound and inserts can be selected same material, and those skilled in the art can realize according to the technical program.
(10) be lowered to fairlead 12, fairlead 12 is seated in temporary sealed opening sleeve pipe 8 upper ends, slips anchoring is at the inwall of main sleeve pipe 2, the gathering sill of fairlead 12 is consistent with the window of top set's well, be the window direction of the direction of gathering sill towards top set's well, fairlead 12 is determined the angle relation with perforate sleeve pipe 8 by directional bond, and the angle relation determines that according to actual conditions those skilled in the art can realize.
The present invention can guide tubing string to enter the inferior division well with straight seeker when being lowered to later stage working string such as perforation or pressure break.
If want to enter top set's well, then get final product with curved guide shoe and guide sub, tubing string just can be lowered to when the feather key of guide sub rotates to the gathering sill of fairlead 12, this moment curved guide shoe just in time facing to top set's window, nature enters top set's well with the tubing string guiding.
If top set well top also has branch well hole, with the window of the gathering sill of fairlead and the branch well hole certain angle that staggers, such as 180 degree, being lowered to the later stage also adds the guide sub guiding with curved guide shoe during working string, and the direction of curved guide shoe and the guiding of guide sub are built the respective angles that also staggers and got final product as 180 degree.
The present invention can adapt to more branch, divides number many more, and angle control precision requires high more, and the branch number of adaptation is not less than 3.
Obviously; those of ordinary skill in the art is according to technological know-how of being grasped and customary means; according to above said content, can also make the various ways that does not break away from basic technical scheme of the present invention, these pro forma conversion are all within protection scope of the present invention.

Claims (10)

1. temporary sealed opening sleeve pipe Multilateral Wells well cementation completion structure, comprise main borehole (1), main sleeve pipe (2), inferior division well (3), inferior division sleeve pipe (4), whipstock (6), top set's well (7), fairlead (12), it is characterized in that: also comprise the top set's sleeve pipe that is arranged in top set's well (7), described top set sleeve pipe comprises the curved guide shoe (11) that is positioned at top set's well (7), top set's tail pipe (10) that is connected with curved guide shoe (11) and the perforate sleeve pipe (8) that is connected with top set's tail pipe (10), the link that perforate sleeve pipe (8) is connected with top set's tail pipe (10) is positioned at top set's well (7), the other end is fixed in the main sleeve pipe (2), is provided with sealing compound in the perforate of perforate sleeve pipe (8); Main sleeve pipe (2) is arranged in the main borehole (1), inferior division sleeve pipe (4) is arranged in the inferior division well (3), be provided with fairlead (12), finder (5) and whipstock (6) in the main sleeve pipe (2), fairlead (12) is positioned at the top of perforate sleeve pipe (8) and main sleeve pipe (2) bearing, finder (5) is positioned at inferior division sleeve pipe (4) top, whipstock (6) is positioned at finder (5) top, is provided with inserts in the inner via hole of finder (5).
2. temporary sealed opening sleeve pipe Multilateral Wells well cementation completion structure according to claim 1, it is characterized in that: the packing element and the slip seals of described finder (5), finder (5) is anchored on the inwall of main sleeve pipe (2).
3. temporary sealed opening sleeve pipe Multilateral Wells well cementation completion structure according to claim 1, it is characterized in that: the packing element and the slip seals of described whipstock (6), whipstock (6) is anchored on the inwall of main sleeve pipe (2).
4. temporary sealed opening sleeve pipe Multilateral Wells well cementation completion structure according to claim 1, it is characterized in that: described top set tail pipe (10) is connected with perforate sleeve pipe (8) through swivel joint (9), and curved guide shoe (11), top set's tail pipe (10), swivel joint (9) and perforate sleeve pipe (8) are threaded successively.
5. according to arbitrary described temporary sealed opening sleeve pipe Multilateral Wells well cementation completion structure among the claim 1-4, it is characterized in that: described perforate sleeve pipe one end hangs on the main sleeve pipe (2) of top set's well (7) and main sleeve pipe (2) connection place lower edge through the wall hook on the perforate sleeve pipe (8), and the other end hangs on the inwall of main sleeve pipe (2) by slip spider.
6. the well cementation well-completing process of a temporary sealed opening sleeve pipe Multilateral Wells well cementation completion structure as claimed in claim 1 is characterized in that, comprises the steps:
A, bore main borehole, in main borehole, become owner of sleeve pipe down, the interior cementing well of the annular space of main borehole and main sleeve pipe;
B, brill inferior division well are lowered to the inferior division sleeve pipe, cementing well in the annular space of inferior division well and inferior division sleeve pipe in the inferior division well;
C, in main borehole, be lowered to finder, make finder be positioned at inferior division sleeve pipe top, measure the orientation of finder again;
D, before going into the well according to the orientation of finder deflecting surface angle by the design orientation adjustment whipstock of top set's well, adjust and be lowered to whipstock after finishing, make whipstock be positioned at the finder top;
E, by whipstock guiding drilling tool, window sidetracking top set well, salvaging whipstock top set's well drilling well is finished after;
F, in top set's well, be lowered to the top set's sleeve pipe that constitutes by curved guide shoe, top set's tail pipe, swivel joint, perforate sleeve pipe;
G, go up the swivel joint of lower tubular column by pressed status and relatively rotate, make wall hook on the perforate sleeve pipe rotate to sealed opening direction on the perforate sleeve pipe automatically over against the bottom main borehole;
Cementing well in the annular space of h, top set's sleeve pipe and top set's well;
I, brill are got through main borehole and inferior division well except the sealing compound of borehole jack pipe and the inserts of finder;
J, be lowered to fairlead, make fairlead be positioned at perforate sleeve pipe upper end, the gathering sill of fairlead is corresponding with the window of top set's well, determines that again the fairlead and the angle of perforate sleeve pipe concern that the completion of cementing the well is finished.
7. a kind of temporary sealed opening sleeve pipe Multilateral Wells well cementation well-completing process according to claim 6 is characterized in that: also comprise the step that enters the inferior division well with straight seeker guiding later stage working string.
8. a kind of temporary sealed opening sleeve pipe Multilateral Wells well cementation well-completing process according to claim 7, it is characterized in that: also comprise the gathering sill position of the feather key of rotary steering joint to fairlead, make the window of curved guide shoe, later stage working string guiding is entered the step of top set's well facing to top set's well.
9. according to arbitrary described a kind of temporary sealed opening sleeve pipe Multilateral Wells well cementation well-completing process among the claim 6-8, it is characterized in that: described cementing well is that clear water is annotated in first cementing again in the sleeve pipe, inject clear water and make cement be positioned at the annular space of well and sleeve pipe, sleeve pipe and well are consolidated.
10. according to arbitrary described a kind of temporary sealed opening sleeve pipe Multilateral Wells well cementation well-completing process among the claim 6-8, it is characterized in that: in the described f step, with the beneath window of sleeve pipe elder generation of top set down to top set's well, upwards carry again and positive tube post, curved guide shoe is adjacent in main borehole one side by elasticity, when curved guide shoe was just going to the window's position of top set's well, the elbow of curved guide shoe entered the window of top set's well, and top set's sleeve pipe guiding is entered in top set's well.
CN2010101316624A 2010-03-24 2010-03-24 Well cementation and completion structure and process for cased branch well with temporarily-sealed opening Expired - Fee Related CN101818619B (en)

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Cited By (4)

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CN102409977A (en) * 2011-11-16 2012-04-11 中国石油集团长城钻探工程有限公司 Integrated replacement process of branched well whipstock and hollow whipstock
CN105507839A (en) * 2015-12-01 2016-04-20 中国石油天然气集团公司 Window milling method for casings of continuous oil pipes
CN106639969A (en) * 2016-11-29 2017-05-10 中国石油天然气股份有限公司 Blocking method for perforation well sections of slim hole sidetracking well
CN107152268A (en) * 2017-07-13 2017-09-12 中国石油集团长城钻探工程有限公司 A kind of branch's well construction and its formation process

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