CN118187680A - Deep water shallow layer three-in-one well construction method - Google Patents
Deep water shallow layer three-in-one well construction method Download PDFInfo
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- 238000005553 drilling Methods 0.000 claims abstract description 86
- 230000036346 tooth eruption Effects 0.000 claims abstract description 28
- 239000002344 surface layer Substances 0.000 claims abstract description 26
- 239000010410 layer Substances 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 15
- 238000009434 installation Methods 0.000 claims abstract description 9
- 238000005507 spraying Methods 0.000 claims abstract description 5
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- 238000005520 cutting process Methods 0.000 claims description 13
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- 210000002445 nipple Anatomy 0.000 claims description 12
- 238000005259 measurement Methods 0.000 claims description 10
- 230000002159 abnormal effect Effects 0.000 claims description 7
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- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000013049 sediment Substances 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000011161 development Methods 0.000 abstract description 17
- 230000018109 developmental process Effects 0.000 abstract description 17
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/12—Underwater drilling
- E21B7/136—Underwater drilling from non-buoyant support
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
- E21B10/32—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools
- E21B10/322—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools cutter shifted by fluid pressure
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/42—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/02—Determining slope or direction
- E21B47/022—Determining slope or direction of the borehole, e.g. using geomagnetism
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/28—Enlarging drilled holes, e.g. by counterboring
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (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)
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Abstract
The invention discloses a deep water shallow layer three-in-one well construction method, which comprises the following steps: the dual-function installation tool is installed on the underwater base in a descending mode through the drill string; installing a surface layer conduit in place by a spraying and putting down method, and standing for a designed waiting time, and continuously drilling until the lower end of a telescopic reamer of the multifunctional bottom drilling tool reaches the surface layer conduit shoes; opening cutting teeth of the telescopic reamer to perform reaming operation; drilling to the designed run-in depth of the surface casing to open the surface casing well section borehole; closing the cutting teeth of the telescopic reamer to perform drilling operation; continuing drilling to a designed run-in depth of the technical casing to open a wellbore of the technical casing wellbore; and lifting the drill string, and lowering the surface casing and the technical casing to well fix the well. The invention can realize the combined operation of the surface conduit, the surface sleeve and the technical sleeve by only one drilling, shortens the construction period, reduces the operation cost, ensures the benefit of oil field development and realizes the safe and efficient development of offshore oil.
Description
Technical Field
The invention relates to the technical field of ocean oil and gas drilling engineering, in particular to a deep water shallow layer three-in-one well construction method.
Background
In recent years, deep sea petroleum operations have been considered as an important frontier for the petroleum industry, and deep water drilling has become a mature technique in the past 20 years, and more deep water fields are currently under development in northern africa, the gulf of mexico, the brazil sea, and the north sea. Deep water drilling has entered the technology maturity and drilling and completion is feasible within 3000 meters of water depth. However, deep water drilling still faces the key problems of high cost, complex process and the like, so that the cost and risk of deep water operation are reduced, and the time effect of deep water operation is improved in the future of the development of deep water drilling technology.
In deep-sea oil and gas drilling development, deep-water shallow drilling is very critical, and deep-water shallow drilling technology is the first step of deep-sea oil and gas development engineering, and is required to be carried out on the sea, a wellhead is firstly established on the sea surface, then the wellhead is established to the sea bottom, and oil and gas resources on the sea bottom form a channel. The next construction is to form a channel on the sea floor and platform, separate the sea water, and then do the next deep oil and gas drilling work. The deep water shallow layer generally has operation risk factors such as soft stratum structure, unstable seabed, seabed shallow fault, ancient river channel, natural gas hydrate, shallow gas shallow layer flow and the like. The conventional deep water shallow well construction mode has the disadvantages of complicated operation process, long construction period and poor economy, and particularly has the disadvantages of overlong surface layer well construction period in the development process of deep water oil fields and ultra-deep water oil fields.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides a deep water shallow layer three-in-one well construction method, which aims to optimize the deep water shallow layer well construction process flow, integrate the traditional three-time well section operation, finally realize the combined operation of a surface layer conduit, a surface layer sleeve and a technical sleeve by only one drilling, shorten the construction period, reduce the operation cost, ensure the benefit of oil field development and realize the safe and efficient offshore oil development.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a deep water shallow layer three-in-one well construction method comprises the following steps:
the dual-function installation tool is installed on the underwater base in a descending mode through the drill string;
Installing a surface layer conduit in place by a spraying and putting down method, and standing for a designed waiting time, and continuously drilling until the lower end of a telescopic reamer of the multifunctional bottom drilling tool reaches the surface layer conduit shoes;
opening the telescopic reamer, opening the cutting teeth, and performing reaming operation;
Drilling to the designed running depth of the surface casing to open the wellbore of the surface casing section, and establishing the wellbore of the surface casing section;
Closing the telescopic reamer, contracting the cutting teeth, and performing drilling operation;
Continuing drilling to the designed running depth of the technical casing to open the borehole of the technical casing section and establish the borehole of the technical casing section;
And lifting the drill string, and lowering the surface casing and the technical casing to well fix the well.
As preferable: the multifunctional bottom hole drilling tool comprises a drill rod, a drill collar, a centralizer, a measurement while drilling assembly, a mud motor, a telescopic reamer and a PDC drill bit;
The PDC drill bit consists of a drill bit body and cutting teeth and is used for cutting and crushing stratum to form a borehole channel; the mud motor is placed in the drill pipe for providing additional power to the PDC bit; the measurement while drilling assembly consists of a measurement nipple, a transmitting nipple, a wireless nipple and a receiving nipple and is used for measuring well deviation and azimuth data of the position near the PDC drill bit; the telescopic reamer is arranged on the drill rod close to the PDC drill bit and is used for reaming and drilling operation of a two-open-hole section; the centralizer is connected to the drill rod and used for stabilizing the drilling direction; the drill collar is arranged at the lowest part of the drill rod, and connecting threads are processed at two ends of the drill collar and used for ensuring that the PDC drill bit works stably; the drill rod is a steel pipe with threads at the tail part and is used for connecting ground equipment and the PDC drill bit.
As preferable: the telescopic reamer comprises: the telescopic reamer body is of a tubular structure, a drilling fluid flow channel is formed in the telescopic reamer body, a plurality of accommodating grooves are formed in the telescopic reamer body along the circumferential direction, and the accommodating grooves are communicated with the drilling fluid flow channel; the cutting teeth are respectively arranged in the accommodating grooves of the telescopic reamer body and can move in the accommodating grooves along the radial direction of the telescopic reamer body; the sensing device is arranged inside the telescopic reamer body and can move along the axial direction of the telescopic reamer body, and the sensing device is used for closing or opening a passage between the accommodating groove and the drilling fluid flow passage.
As preferable: a plurality of circulation holes are designed in the telescopic reamer body, and drilling fluid can circulate through the circulation holes.
As preferable: in the stage of the surface layer conduit entering, seawater is pumped into the drill string and sprayed out from the drill bit, and the seabed sediment is washed away, so that the entering resistance of the surface layer conduit is reduced, the surface layer conduit is installed in place, and the surface layer conduit is installed after the waiting time of standing design is shortened.
As preferable: the reaming operation stage comprises the following substeps:
adjusting the surface equipment to reversely rotate the drill string at an abnormal rotating speed;
the ground equipment acquires a signal of an induction device in the telescopic reamer body and triggers the induction device;
Cutting teeth of the telescopic reamer are opened to control the discharge capacity of drilling fluid;
The reaming operation is started.
As preferable: the drilling operation stage comprises the following substeps:
Adjusting the abnormal rotating speed of the ground equipment to positively rotate the drill string;
the ground equipment acquires a signal of an induction device in the telescopic reamer body and triggers the induction device;
cutting teeth of the telescopic reamer are closed, and drilling fluid discharge capacity is controlled;
The drilling operation is started.
Due to the adoption of the technical scheme, the invention has the following advantages:
1. Compared with the traditional well construction method, the method can effectively shorten the average operation time of deep water shallow drilling, realize the efficient well construction of a deep water layer, ensure the benefit of oil field development, reduce the development risk, realize the safe and efficient development of the deep water oil field, and have important significance for saving offshore operation time and ensuring offshore operation safety
2. The multifunctional bottom hole drilling tool provided by the invention can be suitable for various working conditions: ① Drilling a deep water surface layer; ② Cementing the back reaming operation of the loose stratum; ③ Reaming of easily-reduced, easily-expanded or abrasive formations; ④ Wellbores with ECD or casing clearance problems.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Like parts are designated with like reference numerals throughout the drawings. In the drawings:
FIG. 1 is a schematic diagram of an overall flow of a deep water shallow layer three-in-one well construction method according to an embodiment of the present invention;
FIG. 2 is a schematic view of a multi-functional bottom hole assembly according to an embodiment of the present invention;
FIG. 3a is a schematic view of a retractable reamer of the present invention in a closed position with cutting teeth;
FIG. 3b is a schematic view of the expandable reamer of the present invention in an open position with cutting teeth.
The reference numerals in the figures are as follows:
1. A drill string; 2. a dual function installation tool 3, an underwater base; 4. a surface catheter; 5. multifunctional bottom hole assembly; 6. a telescoping reamer; 7. a surface layer sleeve; 8. a technical sleeve; 9. a drill rod; 10. a drill collar; 11. a centralizer; 12. a measurement while drilling assembly; 13. a mud motor; 15. PDC drill bit; 61. a telescoping reamer body; 62. cutting teeth; 63. an induction device.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "plurality" is two or more unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
The invention provides a deep water shallow layer three-in-one well construction method, which comprises the following steps: the dual-function installation tool is installed on the underwater base in a descending mode through the drill string; installing a surface layer conduit in place by a spraying and putting down method, and standing for a designed waiting time, and continuously drilling until the lower end of a telescopic reamer of the multifunctional bottom drilling tool reaches the surface layer conduit shoes; opening cutting teeth of the telescopic reamer to perform reaming operation; drilling to the designed run-in depth of the surface casing to open the surface casing well section borehole; closing the cutting teeth of the telescopic reamer to perform drilling operation; continuing drilling to a designed run-in depth of the technical casing to open a wellbore of the technical casing wellbore; and lifting the drill string, and lowering the surface casing and the technical casing to well fix the well. The invention can realize the combined operation of the surface conduit, the surface sleeve and the technical sleeve by only one drilling, shortens the construction period, reduces the operation cost, ensures the benefit of oil field development and realizes the safe and efficient development of offshore oil.
The method for constructing the deep water shallow layer three-in-one well provided by the embodiment of the invention is described in detail below with reference to the accompanying drawings.
Referring to fig. 1, the invention provides a deep water shallow layer three-in-one well construction method, which specifically comprises the following steps:
S1, a dual-function installation tool 2 is installed on an underwater base 3 in a descending mode through a drill string 1;
s2, installing the surface layer conduit 4 in place through a spraying and lowering method, and standing for design waiting time, and continuously drilling until the lower end of the telescopic reamer 6 of the multifunctional bottom drilling tool 5 reaches the shoe of the surface layer conduit 4;
s3, opening the telescopic reamer 6, opening cutting teeth (refer to FIG. 3 a), and performing reaming operation (two-opening operation);
S4, drilling to the designed running depth of the surface casing so as to open the well bore of the surface casing section, and establishing the well bore of the surface casing section;
S5, closing the telescopic reamer 6, contracting the cutting teeth (refer to FIG. 3 b), and performing drilling operation (three-opening operation);
s6, continuing drilling to the designed running depth of the technical casing so as to open the well bore of the technical casing section and establish the well bore of the technical casing section;
s7, lifting the drill string 1, and setting the surface casing 7 and the technical casing 8 and cementing the well.
In the above embodiment, referring to fig. 2, the multifunctional bottom hole assembly 5 preferably includes a drill pipe 9, a drill collar 10, a centralizer 11, a measurement while drilling assembly 12, a mud motor 13, a telescoping reamer 6, and a PDC bit 15. The PDC bit 15 is composed of a bit body and cutters, among other things, for cutting and fracturing the formation to form a wellbore path. A mud motor 13 is placed in the drill pipe 9 for providing additional power to the PDC bit 15. The measurement while drilling assembly 12 is composed of a measurement nipple, a transmitting nipple, a wireless nipple and a receiving nipple and is used for measuring data such as well deviation, azimuth and the like of the position near the PDC drill bit 15. The telescopic reamer 6 is arranged on a drill rod 9 close to the PDC drill bit 15 and is used for reaming and drilling operation of two open well sections. A centralizer 11 is attached to the drill pipe 9 for stabilizing the drilling direction. The drill collar 10 is arranged at the lowest part of the drill rod 9, and connecting threads are machined at two ends of the drill collar for ensuring stable operation of the PDC drill bit 15. The drill rod 9 is a steel pipe with threads at the tail part and is used for connecting ground equipment and the PDC drill bit 15.
In the above embodiment, preferably, referring to fig. 3a and 3b, the telescopic reamer 6 includes a telescopic reamer body 61, cutting teeth 62 and a sensing device 63, the telescopic reamer body 61 has a tubular structure, a drilling fluid flow channel is formed in the telescopic reamer body 61, a plurality of cutting tooth accommodating grooves are formed on the telescopic reamer body 61 along the circumferential direction, and the cutting tooth accommodating grooves are communicated with the drilling fluid flow channel; the cutting teeth 62 are arranged in the cutting teeth accommodating grooves of the telescopic reamer body 61, and the cutting teeth 62 can move in the cutting teeth accommodating grooves along the radial direction of the telescopic reamer body 61; the sensing device 63 is disposed inside the expandable reamer body 61 and is movable along the axial direction of the expandable reamer body 61, and the sensing device 63 is used for closing or opening a passage between the cutting tooth accommodating groove and the drilling fluid flow passage. Through the above arrangement, during normal drilling, the passage between the cutting tooth accommodating groove and the drilling fluid flow passage is shut off by the sensing device 63, and the cutting tooth 62 is retracted in the cutting tooth accommodating groove; when the drill string 1 is reversely rotated or thrown at an abnormal rotation speed, the sensing device 63 can be triggered to move, at the moment, a passage between the cutting tooth accommodating groove and the drilling fluid flow passage is opened by the sensing device 63, part of drilling fluid flows into the cutting tooth accommodating groove and drives the cutting tooth 62 to extend outwards, and reaming operation is carried out.
In the above embodiment, preferably, the telescopic reamer body 61 is provided with a plurality of circulation holes, and the drilling fluid can circulate through the circulation holes, so that the rock carrying capacity of the drilling annulus can be effectively improved, and the cuttings can be removed.
In the above embodiment, preferably, in the surface conduit running stage, sea water is pumped into the drill string 1 and sprayed out from the drill bit to flush out the seabed sediment, so as to reduce the running resistance of the surface conduit 4, and the surface conduit installation operation is completed after the waiting time of standing design is reached.
In the above embodiment, preferably, the step S3 includes the following sub-steps:
S31, adjusting surface equipment to reversely rotate the drill string 1 at an abnormal rotating speed;
s32, the ground equipment acquires a signal of an induction device in the telescopic reamer body 61, and triggers the induction device;
S33, cutting teeth 62 of the telescopic reamer 6 are opened, and drilling fluid displacement is controlled;
S34, starting reaming operation.
In the above embodiment, preferably, the step S5 includes the following sub-steps:
S51, adjusting the abnormal rotating speed of the ground equipment to positively rotate the drill string 1;
s52, the ground equipment acquires a signal of an induction device in the telescopic reamer body 61, and triggers the induction device;
s53, cutting teeth 62 of the telescopic reamer 6 are closed, and drilling fluid displacement is controlled;
S54, starting drilling operation.
In summary, the deep water shallow layer well construction method provided by the invention optimizes the process flow of deep water surface layer well construction, introduces a multifunctional bottom drilling tool, and can complete the installation operation of the surface layer conduit, the surface layer sleeve and the technical sleeve by one drilling under the condition of complex underwater environment. Compared with the traditional deep water shallow well construction method, the method has the advantages of simple process, short operation period and the like, can better adapt to the requirements of deep water shallow well construction operation, simultaneously avoids frequently taking off the whole drilling pipe column during the deep water shallow well construction operation, reduces the operation period and the production cost on the premise of ensuring safe development, ensures the benefit of oil field development, is favorable for realizing the efficient development of the ocean oil field, and has good practicability and popularization value.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application 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 scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application, and are intended to be included within the scope of the appended claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.
Claims (7)
1. The deep water shallow layer three-in-one well construction method is characterized by comprising the following steps of:
the dual-function installation tool is installed on the underwater base in a descending mode through the drill string;
Installing a surface layer conduit in place by a spraying and putting down method, and standing for a designed waiting time, and continuously drilling until the lower end of a telescopic reamer of the multifunctional bottom drilling tool reaches the surface layer conduit shoes;
opening the telescopic reamer, opening the cutting teeth, and performing reaming operation;
Drilling to the designed running depth of the surface casing to open the wellbore of the surface casing section, and establishing the wellbore of the surface casing section;
Closing the telescopic reamer, contracting the cutting teeth, and performing drilling operation;
Continuing drilling to the designed running depth of the technical casing to open the borehole of the technical casing section and establish the borehole of the technical casing section;
And lifting the drill string, and lowering the surface casing and the technical casing to well fix the well.
2. The deep water shallow "three-in-one" well construction method of claim 1, wherein the multi-functional bottom hole assembly comprises a drill pipe, a drill collar, a centralizer, a measurement while drilling assembly, a mud motor, a telescoping reamer, and a PDC bit;
The PDC drill bit consists of a drill bit body and cutting teeth and is used for cutting and crushing stratum to form a borehole channel; the mud motor is placed in the drill pipe for providing additional power to the PDC bit; the measurement while drilling assembly consists of a measurement nipple, a transmitting nipple, a wireless nipple and a receiving nipple and is used for measuring well deviation and azimuth data of the position near the PDC drill bit; the telescopic reamer is arranged on the drill rod close to the PDC drill bit and is used for reaming and drilling operation of a two-open-hole section; the centralizer is connected to the drill rod and used for stabilizing the drilling direction; the drill collar is arranged at the lowest part of the drill rod, and connecting threads are processed at two ends of the drill collar and used for ensuring that the PDC drill bit works stably; the drill rod is a steel pipe with threads at the tail part and is used for connecting ground equipment and the PDC drill bit.
3. The deep water shallow "three in one" well construction method of claim 2, wherein the telescoping reamer comprises:
The telescopic reamer body is of a tubular structure, a drilling fluid flow channel is formed in the telescopic reamer body, a plurality of accommodating grooves are formed in the telescopic reamer body along the circumferential direction, and the accommodating grooves are communicated with the drilling fluid flow channel;
the cutting teeth are respectively arranged in the accommodating grooves of the telescopic reamer body and can move in the accommodating grooves along the radial direction of the telescopic reamer body;
the sensing device is arranged inside the telescopic reamer body and can move along the axial direction of the telescopic reamer body, and the sensing device is used for closing or opening a passage between the accommodating groove and the drilling fluid flow passage.
4. A deep water shallow "three-in-one" well construction method according to claim 3, wherein a plurality of circulation holes are designed in the telescopic reamer body through which drilling fluid can circulate.
5. The deep water shallow layer three-in-one well construction method according to claim 1, wherein in the surface layer conduit lowering stage, seawater is pumped into a drill string and sprayed out from a drill bit to flush out seabed sediment so as to reduce the lowering resistance of the surface layer conduit, and the surface layer conduit is installed in place and kept standing for a designed waiting time to complete the surface layer conduit installation operation.
6. A deep water shallow "three in one" well construction method according to claim 3, comprising the sub-steps of, during a reaming operation:
adjusting the surface equipment to reversely rotate the drill string at an abnormal rotating speed;
the ground equipment acquires a signal of an induction device in the telescopic reamer body and triggers the induction device;
Cutting teeth of the telescopic reamer are opened to control the discharge capacity of drilling fluid;
The reaming operation is started.
7. A deep water shallow "three-in-one" well construction method according to claim 3, characterized in that it comprises the following sub-steps during the drilling operation phase:
Adjusting the abnormal rotating speed of the ground equipment to positively rotate the drill string;
the ground equipment acquires a signal of an induction device in the telescopic reamer body and triggers the induction device;
cutting teeth of the telescopic reamer are closed, and drilling fluid discharge capacity is controlled;
The drilling operation is started.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410342680.9A CN118187680A (en) | 2024-03-25 | 2024-03-25 | Deep water shallow layer three-in-one well construction method |
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