CN216922042U - Branch well branch centralizer for sea natural gas hydrate drilling - Google Patents
Branch well branch centralizer for sea natural gas hydrate drilling Download PDFInfo
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- CN216922042U CN216922042U CN202121252887.5U CN202121252887U CN216922042U CN 216922042 U CN216922042 U CN 216922042U CN 202121252887 U CN202121252887 U CN 202121252887U CN 216922042 U CN216922042 U CN 216922042U
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- NMJORVOYSJLJGU-UHFFFAOYSA-N methane clathrate Chemical compound C.C.C.C.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O NMJORVOYSJLJGU-UHFFFAOYSA-N 0.000 title claims abstract description 41
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- 238000010586 diagram Methods 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Natural products C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
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- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
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Abstract
The utility model discloses a branching centralizer for a multilateral well for a marine natural gas hydrate drill, which comprises a conical body, a connecting part arranged at the first end of the conical body, at least one guide groove arranged on the outer wall surface of the conical body, and at least two guide wing plates arranged on the outer wall surface of the conical body and positioned at two sides of the guide groove, wherein the diameter of the first end of the conical body is smaller than that of the second end of the conical body. When the bottom end of the branch well sleeve needs to be deviated, the centralizer is lifted upwards through the drill rod, the bottom end of the branch well sleeve slides into the guide groove gradually, and the branch well sleeve also deviates outwards gradually along with the gradual upward movement of the centralizer, so that a certain included angle is formed between the bottom end of the branch well sleeve and the centralizer, and the branch well sleeve is expanded outwards. Meanwhile, the guide wing plates are arranged, so that the position deviation of the branch well sleeve when the branch well sleeve slides in the guide groove is prevented, and the branch well sleeve is ensured to slide in the preset direction.
Description
Technical Field
The utility model relates to the field of drilling and production of sea natural gas hydrates, in particular to a branch centralizer for a sea natural gas hydrate drilling branch well.
Background
The natural gas hydrate in the sea area of China is widely distributed, the resource amount is large, and the natural gas hydrate is the most possible alternative energy of the conventional and unconventional petroleum and natural gas and other fossil fuels. At present, our country has already developed two times of trial production of sea natural gas hydrates, the first trial production in 2017 adopts a vertical well type, and the Chinese geological survey bureau in 2019 takes precedence over the horizontal well type in south China sea to perform the trial production of hydrates, so that a world record of 'total gas production amount and daily average gas production amount' is created, but because the exposed area of a reservoir is limited, the single-well productivity cannot meet the commercial development conditions. On the basis of the experience of developing dense oil gas, thick oil and coal bed gas on land for reference, the multilateral well type is adopted to exploit natural gas hydrate in the sea area, 1 or more branch well bores are drilled in one main well bore, the exposed area of a reservoir stratum is increased by multiple times, the single well productivity is improved by multiple times, the development cost is reduced, and the method is an effective way for improving the single well productivity of the natural gas hydrate. On the other hand, the sea natural gas hydrate is generally distributed in the shallow area with the depth of 800m and 300m below a mud line, the reservoir and the overlying strata are generally not cemented into rock, the stratum has low pressure bearing capacity, the stratum strength is continuously reduced in the mining process, and the conventional sidetrack branch well hole may collapse and destabilize the well wall at the sidetrack point, thereby causing drilling accidents. Therefore, a multi-branch mechanism for efficiently developing a multi-branch well of the sea area natural gas hydrate needs to be designed, the mechanical strength of a branch well bore is improved on the basis of improving the single-well productivity of the multi-branch well, and the mechanical integrity and the hydraulic tightness of a production shaft and the reentry capability of a subsequent well completion and workover tool are guaranteed.
Multilateral wells are wells drilled from a main well bore into two or more lateral well bores into the reservoir, and even from a secondary well bore into three lateral well bores. The main well bore can be a vertical well, a directional well or a horizontal well, the branch well bore can also be a directional well or a horizontal well, and the multilateral well is also called a multi-bottom well. Compared with the common vertical well, the directional well and the horizontal well, the multilateral well has the advantages of increasing the exposed area of an oil-gas reservoir, improving oil drainage efficiency, improving an oil-gas flow profile and reducing flow resistance; the well construction cost and the risk of the straight well section are reduced, the moving times of the drilling machine are reduced, the wellhead slot of the offshore platform is fully utilized, the well construction cost is reduced, and the economic benefit is increased. The key core technology of the multilateral well is to realize the mechanical integrity, hydraulic tightness and reentry of the multilateral well bore and the main well bore at the position of the multilateral well bore.
Currently, most multilateral wells are drilled in a main well bore and a multilateral well bore, and then a multi-branch completion mechanism is put down to treat mechanical integrity and hydraulic sealing of the main well bore and the multilateral well bore at a lateral drilling point. The branch well mouth of the multilateral well generally adopts a pre-perforated casing, casing tie-back, casing windowing sidetracking and the like, the connection mode of the branch well hole is a multi-pipe lapping mode, and the lapping technology has certain mechanical strength but cannot ensure the hydraulic tightness of the branch well hole. Therefore, the weakest part of the whole branch well is also positioned at the branch well hole after the current multilateral well is formed.
Considering that a sea natural gas hydrate reservoir is buried shallowly, the existing three-section well bore structure and the production casing are not well-fixed, so that the requirement on the integrity of the well bore of the production well bore is high, and the smooth development of the depressurization exploitation can be ensured only by meeting the hydraulic tightness; the unconsolidated formation strength is continuously weakened in the sea area natural gas hydrate pressure-reducing exploitation process, the deformation of the well wall is intensified under the action of the ground stress and the overlying formation pressure, and the mechanical strength of the existing multilateral well multi-branch mechanism is difficult to meet the requirement of mechanical integrity.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model provides a branch centralizer for a branch well for drilling natural gas hydrate in the sea area.
The technical scheme adopted by the utility model for solving the technical problems is as follows: a structure is that sea area gas hydrate bores and adopts multilateral well branch centralizer, and this centralizer includes the toper body, set up in the connecting portion of this toper body first end, set up in at least one guide way of this toper body outer wall and set up in this toper body outer wall and lie in two at least direction pterygoid lamina of this guide way both sides, and the first end diameter of this toper body is less than this toper body second end diameter.
In the branching centralizer for the sea natural gas hydrate drill, the guide groove is concavely arranged on the outer wall surface of the conical body, and the guide wing plate is convexly arranged on the outer wall surface of the conical body.
In the offshore natural gas hydrate drilling multilateral well centralizer provided by the utility model, the conical body of the conical body is gradually increased in diameter from the first end to the second end.
In the branching centralizer for the offshore natural gas hydrate drilling and adopting the branch well, the guide groove is arranged along the length direction of the conical body, and the guide wing plate is arranged along the length direction of the conical body.
In the branching centralizer for the offshore natural gas hydrate drilling branch well, the depth of the guide groove is gradually reduced from the middle part to the two ends, and the width of the guide groove is gradually reduced from the middle part to the two ends.
In the branching centralizer for the offshore natural gas hydrate drill adopting the branch well, the at least one guide groove is M guide grooves, the at least two guide wing plates are N guide wing plates, the N guide wing plates are wound on the outer side wall of the conical body at equal intervals, the M guide grooves are wound on the outer side wall of the conical body at equal intervals, each guide groove in the M guide grooves is clamped between the two guide wing plates, wherein M is equal to N, and M and N are positive integers greater than or equal to 2.
In the branched centralizer for the offshore natural gas hydrate drilling adoption branched well, the centralizer further comprises a lower cone fixedly arranged at the second end of the conical body, the first end of the lower cone is fixedly connected with the conical body, and the second end of the lower cone is provided with a connecting thread.
In the branched centralizer for the sea natural gas hydrate drilling adoption branched well, the diameter of the lower cone is gradually reduced from the first end to the second end, and a spiral diversion trench is arranged at the joint of the conical body and the lower cone.
In the branching centralizer for the offshore natural gas hydrate drill adopting the branch well, through holes penetrating through the conical body and the lower cone are arranged in the conical body and the lower cone.
In the branching centralizer for the offshore natural gas hydrate drilling multilateral well, the connecting part comprises a connecting pipe fixedly connected with the first end of the conical body and a pipe thread or a connecting buckle arranged on the connecting pipe.
The marine natural gas hydrate drill adopts the branch well branch centralizer, and has the following beneficial effects: when the offshore natural gas hydrate drill adopts the branch centralizer, the centralizer can be connected with the drill rod through the connecting part, meanwhile, the top end of the branch well sleeve is fixed with the wellhead equipment, and the bottom end of the branch well sleeve is arranged around the centralizer. When the bottom end of the branch well sleeve needs to be deviated, the centralizer is lifted upwards through the drill rod, the bottom end of the branch well sleeve gradually slides into the guide groove, and the branch well sleeve gradually deviates outwards along with the gradual upward movement of the centralizer, so that the bottom end of the branch well sleeve and the centralizer form a certain included angle, and the branch well sleeve is expanded outwards. Meanwhile, the guide wing plates are arranged, so that the position deviation of the branch well sleeve when the branch well sleeve slides in the guide groove is prevented, and the branch well sleeve is ensured to slide in the preset direction.
Drawings
The utility model will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic structural diagram of a branch centralizer for a branched well for sea area gas hydrate drilling;
FIG. 2 is a schematic structural diagram of a top view of a branch centralizer for a marine natural gas hydrate drilling branch well according to the utility model;
FIG. 3 is a schematic structural diagram of a first use state of the branch centralizer for a sea area natural gas hydrate drilling branch well according to the utility model;
fig. 4 is a structural schematic diagram of a second use state of the branch centralizer for the offshore natural gas hydrate drilling branch well according to the utility model.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1-4, in the first embodiment of the branching centralizer for offshore natural gas hydrate drilling, the centralizer 1 includes a conical body 2, a connecting portion 5 disposed at a first end of the conical body 2, at least one guide groove 3 disposed on an outer wall surface of the conical body 2, and at least two guide wing plates 4 disposed on the outer wall surface of the conical body 2 and located at two sides of the guide groove 3, wherein a diameter of the first end of the conical body 2 is smaller than a diameter of the second end of the conical body 2.
When the offshore natural gas hydrate drill adopts the branch centralizer 1 for the branch well, the centralizer 1 can be connected with a drill rod through the connecting part 5, meanwhile, the top end of the branch well sleeve 10 and wellhead equipment are fixed, and the bottom end of the branch well sleeve 10 is arranged around the centralizer 1. When the bottom end of the branch well sleeve 10 is required to be deviated, the centralizer 1 is upwards pulled through the drill rod, the bottom end of the branch well sleeve 10 gradually slides into the guide groove 3, and the branch well sleeve 10 gradually deviates outwards along with the gradual upward movement of the centralizer 1, so that a certain included angle is formed between the bottom end of the branch well sleeve 10 and the centralizer 1, and the branch well sleeve 10 is outwards expanded. Meanwhile, the guide wing plate 4 is arranged to prevent the lateral well sleeve 10 from deviating when sliding in the guide groove 3, and ensure the lateral well sleeve 10 to slide in a predetermined direction.
In the present embodiment, the guide groove 3 is recessed in the outer wall surface of the tapered body 2, and the guide vane 4 is protruded in the outer wall surface of the tapered body 2.
Preferably, the conical body 2 is a conical body 2, the diameter of the conical body 2 gradually increasing from the first end to the second end. The guide groove 3 is provided along the length direction of the tapered body 2, and the guide wing 4 is provided along the length direction of the tapered body 2.
As shown in fig. 1, the depth of the guide groove 3 becomes gradually shallower from the middle portion toward both ends, and the width of the guide groove 3 becomes gradually narrower from the middle portion toward both ends.
In the present embodiment, the at least one guide groove 3 is M guide grooves 3, the at least two guide wing plates 4 are N guide wing plates 4, the N guide wing plates 4 are wound on the outer side wall of the tapered body 2 at equal intervals, the M guide grooves 3 are wound on the outer side wall of the tapered body 2 at equal intervals, each guide groove 3 of the M guide grooves 3 is sandwiched between two guide wing plates 4, where M is N, and M and N are positive integers greater than or equal to 2.
Preferably, M and N are 3, 3 guide wing plates 4 are arranged on the outer side wall of the conical body 2 at equal intervals, 3 guide grooves 3 are also arranged on the outer side wall of the conical body 2 at equal intervals, and the included angle between every two adjacent guide wing plates 4 in the 3 guide wing plates 4 is 120 degrees.
Further, this centralizer 1 still includes the lower cone 6 that sets firmly in this toper body 2 second end, and 6 first ends of this lower cone and this toper body 2 fixed connection, this 6 second ends of lower cone are equipped with connecting thread 7.
Further, the diameter of the lower cone 6 is gradually reduced from the first end to the second end, and a spiral guide groove 8 is arranged at the joint of the conical body 2 and the lower cone 6.
Preferably, the spiral guide groove 8 is a double-thread guide groove, so that the strength of the centralizer 1 when the multifunctional drilling tool is lifted is guaranteed, the branch well sleeve 10 is favorably separated and formed, the multifunctional drilling tool smoothly enters a well hole when being drilled downwards, later-stage well cementation is favorably carried out, the cement flow state is changed, the counter torque support is provided when the drill string of the multi-branch well is reversely buckled and lifted after cement is solidified, and the centralizer 1 is better fixed.
Specifically, through holes penetrating through the conical body 2 and the lower cone 6 are arranged in the conical body 2 and the lower cone 6.
In order to facilitate the connection of the centralizer 1 and the drill rod, the connecting portion 5 includes a connecting pipe fixedly connected to the first end of the conical body 2, and a pipe thread or a connecting buckle disposed on the connecting pipe.
In addition, in the present invention, unless otherwise explicitly specified or limited, the terms "connected," "stacked," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The utility model provides a sea area gas hydrate bores and adopts multilateral well branch centralizer, its characterized in that, centralizer (1) include toper body (2), set up in connecting portion (5) of toper body (2) first end, set up in at least one guide way (3) of toper body (2) outer wall surface and set up in toper body (2) outer wall surface is located two at least direction pterygoid lamina (4) of guide way (3) both sides, toper body (2) first end diameter is less than toper body (2) second end diameter.
2. The offshore natural gas hydrate drilling and branching centralizer according to claim 1, wherein the guide groove (3) is concavely arranged on the outer wall surface of the conical body (2), and the guide wing plate (4) is convexly arranged on the outer wall surface of the conical body (2).
3. The offshore natural gas hydrate drilling and branching well centralizer as claimed in claim 2, wherein the conical body (2) is a conical body, and the diameter of the conical body (2) gradually increases from the first end to the second end.
4. The offshore natural gas hydrate drilling and branching well centralizer according to claim 3, wherein the guide groove (3) is arranged along the length direction of the conical body (2), and the guide wing plate (4) is arranged along the length direction of the conical body (2).
5. The offshore natural gas hydrate drilling and branching well centralizer according to claim 4, wherein the depth of the guide groove (3) becomes gradually shallower from the middle part to the two ends, and the width of the guide groove (3) becomes gradually narrower from the middle part to the two ends.
6. The offshore natural gas hydrate drilling and multilateral well branching centralizer according to any one of claims 1-5, wherein the at least one guide groove (3) is M guide grooves (3), the at least two guide wing plates (4) are N guide wing plates (4), the N guide wing plates (4) are wound on the outer side wall of the conical body (2) at equal intervals, the M guide grooves (3) are wound on the outer side wall of the conical body (2) at equal intervals, each guide groove (3) in the M guide grooves (3) is clamped between the two guide wing plates (4), M is N, and M and N are positive integers greater than or equal to 2.
7. The offshore natural gas hydrate drilling and branching well centralizer according to claim 1, wherein the centralizer (1) further comprises a lower cone (6) fixedly arranged at the second end of the conical body (2), the first end of the lower cone (6) is fixedly connected with the conical body (2), and the second end of the lower cone (6) is provided with a connecting thread (7).
8. The offshore natural gas hydrate drilling and branching well centralizer according to claim 7, wherein the diameter of the lower cone (6) is gradually reduced from the first end to the second end, and a spiral diversion trench (8) is formed at the joint of the conical body (2) and the lower cone (6).
9. The offshore natural gas hydrate drilling and branching well centralizer according to claim 8, wherein through holes penetrating through the conical body (2) and the lower cone (6) are formed in the conical body (2) and the lower cone (6).
10. The offshore natural gas hydrate drilling multilateral well centralizer according to claim 1, wherein the connecting part (5) comprises a connecting pipe fixedly connected with the first end of the conical body (2), and a pipe thread or a connecting buckle arranged on the connecting pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121252887.5U CN216922042U (en) | 2021-06-04 | 2021-06-04 | Branch well branch centralizer for sea natural gas hydrate drilling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121252887.5U CN216922042U (en) | 2021-06-04 | 2021-06-04 | Branch well branch centralizer for sea natural gas hydrate drilling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216922042U true CN216922042U (en) | 2022-07-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121252887.5U Expired - Fee Related CN216922042U (en) | 2021-06-04 | 2021-06-04 | Branch well branch centralizer for sea natural gas hydrate drilling |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216922042U (en) |
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2021
- 2021-06-04 CN CN202121252887.5U patent/CN216922042U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20220708 |