CN111946265B - Hollow whipstock capable of being connected back - Google Patents
Hollow whipstock capable of being connected back Download PDFInfo
- Publication number
- CN111946265B CN111946265B CN202010847253.8A CN202010847253A CN111946265B CN 111946265 B CN111946265 B CN 111946265B CN 202010847253 A CN202010847253 A CN 202010847253A CN 111946265 B CN111946265 B CN 111946265B
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- hollow
- whipstock
- inclined plane
- hole
- side wall
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- 210000000078 claw Anatomy 0.000 claims description 10
- 238000003780 insertion Methods 0.000 claims description 5
- 230000037431 insertion Effects 0.000 claims description 5
- 230000007704 transition Effects 0.000 claims description 4
- 210000002310 elbow joint Anatomy 0.000 description 4
- 238000005553 drilling Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Images
Classifications
-
- 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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/06—Deflecting the direction of boreholes
- E21B7/061—Deflecting the direction of boreholes the tool shaft advancing relative to a guide, e.g. a curved tube or a whipstock
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
- Supports For Pipes And Cables (AREA)
Abstract
The invention relates to a hollow whipstock capable of being connected back, which comprises a hollow connecting back part, a hollow guide part and a hollow inserting back part which are arranged with a central shaft, wherein the upper end of the hollow guide part is connected with the lower end of the hollow connecting back part, and the lower end of the hollow guide part is connected with the upper end of the hollow inserting back part; the hollow return connection part is provided with a first through hole which penetrates through two end faces of the hollow return connection part, and the side wall of the hollow return connection part is provided with a first inclined plane; the hollow guide part is provided with a second through hole, the second through hole penetrates through two end faces of the hollow guide part, the first through hole is communicated with the second through hole, a second inclined plane is arranged on the side wall of the hollow guide part, the inclination directions of the first inclined plane and the second inclined plane are opposite, and a recess is formed between the first inclined plane and the second inclined plane. The invention avoids the problem that the traditional whipstock can not guide the branch well pipe string to enter the branch well, thereby solving the technical problems of low success rate and long operation time of the branch well pipe string entering the branch well.
Description
Technical Field
The invention relates to the technical field of petroleum drilling and production equipment, in particular to a hollow whipstock capable of being connected back.
Background
The multilateral well technology can effectively improve the connectivity between an oil-gas well and a reservoir, enlarge the oil drainage area, improve the oil flow profile, increase the single-well productivity and be widely applied to oil-gas fields at home and abroad.
The window connector realizes effective communication between the branch well bore and the main well bore, is guided by a bent connector and is hung at the bottom of the casing window through equipment such as a wall hook. The prior art has the risks that the length, the angle and the offset of the elbow joint are large, so that a branch well pipe string generates large friction resistance when being put into a branch well, and a tail pipe is not easy to put in place; and the position of the elbow joint is unknown in the underground, and a plurality of repeated attempts are needed to enter the branch well bore. Meanwhile, the wall hook suspension type window connector requires that the shape and the state of the sleeve window are regular and have no burrs, so that the sleeve can be smoothly seated and hung in place, and the requirements on the window opening process are higher.
The whipstock is typically used during lateral drilling of a lateral borehole, with the slant guide milling cone, the drill bit completing the windowing of the casing and lateral drilling of the lateral borehole. However, the existing whipstock is recovered after the casing is windowed, and the string of the branch well pipe string cannot be guided to enter the branch well; and are generally solid without the function of a suspended window connector.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a hollow whipstock capable of being connected in a reverse manner, which is used for guiding strings of branch well bores to enter, suspending a window connector, and avoiding the problem that the conventional whipstock cannot guide the strings of the branch well bores to enter the branch well bores, thereby solving the technical problems of low success rate and long operation time when the strings of the branch well bores enter the branch well bores.
In order to achieve the purpose, the invention adopts the following technical scheme:
the hollow whipstock capable of being reconnected comprises a hollow connecting part, a hollow guide part and a hollow plugging part which are arranged with the same central shaft, wherein the hollow guide part is positioned between the hollow connecting part and the hollow plugging part; the hollow return connection part is provided with a first through hole, the first through hole penetrates through two end faces of the hollow return connection part, and a first inclined plane is arranged on the side wall of the hollow return connection part; the hollow guide part is provided with a second through hole, the second through hole penetrates through two end faces of the hollow guide part, the first through hole is communicated with the second through hole, a second inclined plane is arranged on the side wall of the hollow guide part, the inclination directions of the first inclined plane and the second inclined plane are opposite, and a recess is formed between the first inclined plane and the second inclined plane.
The hollow whipstock capable of being reconnected is preferably provided with a spiral guide groove for hanging and guiding the window port connector to be lowered on the inner side wall of the hollow connecting part.
The hollow whipstock can be connected back, and preferably, the aperture of the first through hole is larger than that of the second through hole.
The hollow whipstock is connected back, and preferably, the included angle between the first inclined plane and the second inclined plane is greater than 90 °.
The hollow whipstock is preferably provided with a reverse slope at the lower end of the hollow return portion in the circumferential direction, wherein the reverse slope forms a transition from the hollow return portion to the hollow guide portion.
The hollow whipstock is connected back, and preferably, the side wall of the hollow back-inserting part is provided with a spiral key for ensuring the hollow whipstock to be smoothly inserted into the lower anchor.
The hollow whipstock is connected with the hollow plug-back portion, and preferably, the spiral key extends from the upper end to the middle of the hollow plug-back portion.
The hollow whipstock can be connected back, and preferably, a plurality of elastic claws for locking with the lower anchor are arranged on the lower side wall of the hollow back insertion part at intervals along the circumferential direction.
The hollow whipstock can be connected back, and the elastic claws are preferably evenly distributed along the circumferential direction.
The retractable hollow whipstock preferably has a lower end of each of the resilient fingers provided with a projection for engaging a member in the anchor.
Due to the adoption of the technical scheme, the invention has the following advantages:
the invention avoids using the elbow joint to guide the string of the branch well pipe column, reduces the friction resistance of the whole string of pipe columns in the running-in process, and reduces the risk of the string of the branch well pipe column not running in place.
The invention utilizes the inclined plane with the through hole which can be connected with the hollow whipstock back to guide the string of the branch well pipe column to enter quickly, thereby improving the success rate of the string of the branch well pipe column entering the branch well and saving the operation time.
The invention has the capability of hanging the window connector with the positioning boss, and reduces the difficulty of sitting and hanging the window connector.
The spiral guide groove is arranged at the top of the device, so that the accurate position of the window connector after being hung is ensured, the effective alignment of the opening of the window connector and the through hole of the hollow whipstock which can be connected back is realized, and the device is favorable for the reentry operation of a main well.
Drawings
FIG. 1 is a schematic structural view of a hollow whipstock of the present invention;
FIG. 2 is a side view of FIG. 1;
FIG. 3 is a rear view of FIG. 1;
FIG. 4 is an enlarged partial schematic view of the hollow return of FIG. 1;
fig. 5 is a partially enlarged schematic view of the hollow reinsertion portion of fig. 1.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the objects, features and advantages of the invention can be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are merely intended to illustrate the spirit of the technical solution of the present invention.
As shown in fig. 1 to 3, the hollow whipstock capable of being connected back comprises a hollow connection part 1, a hollow guide part 2 and a hollow insertion part 3 which are sequentially arranged from top to bottom, the three parts are arranged with the same central axis, the hollow guide part 2 is positioned between the hollow connection part 1 and the hollow insertion part 3, the upper end of the hollow guide part 2 is connected with the lower end of the hollow connection part 1, and the lower end of the hollow guide part 2 is connected with the upper end of the hollow insertion part 3.
The hollow connecting part 1 is provided with a first through hole 4, the first through hole 4 penetrates through two end faces of the hollow connecting part 1, and the side wall of the hollow connecting part 1 is provided with a first inclined plane 5; a second through hole 6 is formed in the hollow guide part 2, the second through hole 6 penetrates through two end faces of the hollow guide part 2, the first through hole 4 is communicated with the second through hole 6, a second inclined plane 7 is formed in the side wall of the hollow guide part 2, the inclination directions of the first inclined plane 5 and the second inclined plane 7 are opposite, and a recess is formed between the first inclined plane 5 and the second inclined plane 7; the aperture of the first through-hole 4 is larger than that of the second through-hole 6.
When the branch well is in operation, a branch well string (not shown in the figure) with a window connector passes through the first through hole 4 of the hollow return connection part 1 and enters a branch well under the guidance of the second inclined surface 7; the second through hole 6 is arranged to communicate the main shaft at the upper part of the branch well bore with the main well bore at the lower part of the branch well bore, so that subsequent reentry work of the main well bore can be smoothly carried out.
Here, it should be noted that the outer diameter of the guide shoe at the lower end of the branch well pipe string should be larger than the opening hole diameter size of the second through hole 6, so as to avoid entering the second through hole 6 due to the small size of the branch well pipe string, which cannot enter the branch well.
In the above embodiment, it is preferable that a spiral guide groove 8 for hanging and guiding the window adapter to be lowered is provided on the inner sidewall of the hollow returning part 1 as shown in fig. 4, and the spiral guide groove 8 is used for hanging and guiding the window adapter to be smoothly lowered to be in place.
It should be noted that the window connector is located at the top of the string of lateral well strings (not shown), i.e. the lower end of the window connector is connected to the top of the string of lateral well strings, and the upper end of the window connector is suspended in the hollow return portion 1 of the hollow whipstock.
In the above embodiment, the included angle between the first inclined surface 5 and the second inclined surface 7 is preferably greater than 90 °. This enables the lateral string to be guided more easily by the second inclined surface 7 and enter the lateral more smoothly.
In the above embodiment, preferably, a reverse slope 9 for forming a transition from the hollow returning part to the hollow guiding part is provided at the lower end of the hollow returning part 1 along the circumferential direction. This is a transition from the hollow return 1 to the hollow guide 2, avoiding the presence of corners.
In the above-mentioned embodiment, preferably, as shown in fig. 5, a spiral key 10 is provided on the side wall of the hollow reinsertion portion 3, wherein the spiral key 10 extends from the upper end to the middle of the hollow reinsertion portion 3. The hollow back-insert part 3 is inserted into the anchor (not shown in the figure), and the hollow whipstock is smoothly inserted into the lower anchor under the guiding action of the spiral key 10.
In the above-mentioned embodiment, preferably, a plurality of elastic claws 11 for locking with the lower anchor are circumferentially provided at intervals on the lower side wall of the hollow reinsertion portion 3. Wherein the elastic claws 11 are evenly distributed along the circumferential direction, and the lower end of each elastic claw 11 is provided with a lug 12 used for being engaged with a component in the anchor. When the hollow whipstock is put in place, the elastic claw 11 is put into the anchor, the convex block 12 on the elastic claw 11 is occluded with the component in the anchor to limit the up-and-down displacement of the hollow whipstock, and the locking with the lower anchor is realized.
In addition, the invention utilizes the inclined plane with holes (namely the second inclined plane) which can be connected with the hollow whipstock in a return way to quickly guide the string of the branch well pipe column to enter, thereby improving the success rate of the string of the branch well pipe column entering the branch well; the tail pipe is guided by the elbow joint, so that the friction resistance of the whole set of pipe column string in the running-in process is reduced, and the risk of the branch well pipe column not running in place is reduced; and the window connector with the positioning boss can be hung, so that the difficulty of hanging the window connector is reduced.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A hollow whipstock capable of being connected back is characterized by comprising a hollow connecting back part, a hollow guide part and a hollow inserting back part which are arranged with the same central shaft, wherein the hollow guide part is positioned between the hollow connecting back part and the hollow inserting back part;
the hollow return connection part is provided with a first through hole, the first through hole penetrates through two end faces of the hollow return connection part, and a first inclined plane is arranged on the side wall of the hollow return connection part;
the hollow guide part is provided with a second through hole, the second through hole penetrates through two end faces of the hollow guide part, the first through hole is communicated with the second through hole, the side wall of the hollow guide part is provided with a second inclined plane, the inclination directions of the first inclined plane and the second inclined plane are opposite, and a recess is formed between the first inclined plane and the second inclined plane;
a plurality of elastic claws used for locking with a lower anchor are arranged on the side wall of the lower part of the hollow back-inserting part at intervals along the circumferential direction; the elastic claws are uniformly distributed along the circumferential direction; the lower end of each elastic claw is provided with a lug used for being meshed with a component in the anchor.
2. A reconnectable hollow whipstock according to claim 1, wherein a helical guide groove for suspending and guiding the window connector down is provided on the inner side wall of the hollow whipstock.
3. A retractable hollow whipstock as claimed in claim 1, wherein the first bore is larger in diameter than the second bore.
4. A retractable hollow whipstock as claimed in claim 1, wherein the angle between the first and second ramps is greater than 90 °.
5. A retractable hollow whipstock as claimed in claim 1, wherein a lower end of the hollow return portion is provided with a chamfer circumferentially forming a transition from the hollow return portion to the hollow guide portion.
6. A retrievable hollow whipstock according to any one of claims 1 to 5, wherein the side wall of the hollow reinsertion portion is provided with a helical key for ensuring smooth insertion of the hollow whipstock into the lower anchor.
7. A retrievable hollow whipstock according to claim 6, wherein the helical key extends from the upper end to the middle of the hollow reinsertion portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010847253.8A CN111946265B (en) | 2020-08-21 | 2020-08-21 | Hollow whipstock capable of being connected back |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010847253.8A CN111946265B (en) | 2020-08-21 | 2020-08-21 | Hollow whipstock capable of being connected back |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111946265A CN111946265A (en) | 2020-11-17 |
| CN111946265B true CN111946265B (en) | 2022-05-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010847253.8A Active CN111946265B (en) | 2020-08-21 | 2020-08-21 | Hollow whipstock capable of being connected back |
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| Country | Link |
|---|---|
| CN (1) | CN111946265B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112627778B (en) * | 2020-12-18 | 2023-02-21 | 中海石油(中国)有限公司 | Branch well double-pipe completion pipe string system and construction method and oil extraction method thereof |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1793599A (en) * | 2005-12-30 | 2006-06-28 | 中国海洋石油总公司 | Apparatus for connecting branching well window and connecting method thereof |
| CN101413384A (en) * | 2008-11-24 | 2009-04-22 | 中国石油集团长城钻探工程有限公司 | Method for sealing branch well window by using metal expansion pipe |
| CN201386510Y (en) * | 2009-04-23 | 2010-01-20 | 常琦 | Hydraumatic self- sealed self-locking window-opening integrated whipstock |
| 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 for multilateral well whipstock and hollow whipstock |
| CN102418478A (en) * | 2011-12-29 | 2012-04-18 | 中国海洋石油总公司 | Hollow whipstock for windowing and side drilling of branched well |
| CN102434099A (en) * | 2011-11-16 | 2012-05-02 | 中国石油集团长城钻探工程有限公司 | Integrated device of multilateral well whipstock and hollow whipstock |
| CN105275396A (en) * | 2015-11-05 | 2016-01-27 | 中国海洋石油总公司 | Whipstock for casing pipes below mud line and applicable to abandoned wellhead slot recycle |
| CN205477483U (en) * | 2016-02-29 | 2016-08-17 | 河北中荣石油机械有限责任公司 | Integrated whipstock |
-
2020
- 2020-08-21 CN CN202010847253.8A patent/CN111946265B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1793599A (en) * | 2005-12-30 | 2006-06-28 | 中国海洋石油总公司 | Apparatus for connecting branching well window and connecting method thereof |
| CN101413384A (en) * | 2008-11-24 | 2009-04-22 | 中国石油集团长城钻探工程有限公司 | Method for sealing branch well window by using metal expansion pipe |
| CN201386510Y (en) * | 2009-04-23 | 2010-01-20 | 常琦 | Hydraumatic self- sealed self-locking window-opening integrated whipstock |
| 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 for multilateral well whipstock and hollow whipstock |
| CN102434099A (en) * | 2011-11-16 | 2012-05-02 | 中国石油集团长城钻探工程有限公司 | Integrated device of multilateral well whipstock and hollow whipstock |
| CN102418478A (en) * | 2011-12-29 | 2012-04-18 | 中国海洋石油总公司 | Hollow whipstock for windowing and side drilling of branched well |
| CN105275396A (en) * | 2015-11-05 | 2016-01-27 | 中国海洋石油总公司 | Whipstock for casing pipes below mud line and applicable to abandoned wellhead slot recycle |
| CN205477483U (en) * | 2016-02-29 | 2016-08-17 | 河北中荣石油机械有限责任公司 | Integrated whipstock |
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| Publication number | Publication date |
|---|---|
| CN111946265A (en) | 2020-11-17 |
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