CN115637926B - Drilling and well completion method for drilling U-shaped oil well by using inclined and vertical well drilling machine - Google Patents
Drilling and well completion method for drilling U-shaped oil well by using inclined and vertical well drilling machine Download PDFInfo
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Abstract
The invention relates to the technical field of petroleum drilling and completion, in particular to a drilling and completion method for drilling a U-shaped oil well by using a slant and straight well drilling machine. The invention uses a slant straight well drilling machine to drill a well from one end of a shallow oil deposit at a certain initial well slant angle, and drill out the ground from the other end, so as to form a surface casing well section, a slant straight well section, a directional slant increasing well section, a horizontal well section and an upper cantilever well section in sequence, drill out a U-shaped oil well with low dogleg degree, and complete the well by using a dragging type electric logging and casing running method. The difficulty of electrical measurement and casing running can be obviously reduced by drilling with the method, the electrical measurement and casing running are easier to complete, a well completion pipe column is easier to run, and the aim of efficiently exploiting the petroleum on the shallow part of the stratum is fulfilled finally; the reduction of dog-leg degree can also greatly prolong the service life of the sleeve. The well drilling and completion method is safe and reliable, is simple and convenient to operate, and has good popularization prospect in shallow petroleum areas.
Description
Technical Field
The invention relates to the technical field of petroleum drilling and completion, in particular to a drilling and completion method for drilling a U-shaped oil well by using a slant and straight well drilling machine.
Background
The shallow layer petroleum resources in China are rich and are widely distributed in regions such as Henan oil fields, shengli oil fields, daqing oil fields and the like, and the burial depth is dozens of meters to hundreds of meters. These reservoirs are developed with greater efficiency using horizontal wells than using vertical and directional wells. However, in the current method for drilling a horizontal well perpendicular to the ground, when a horizontal well section is directionally drilled, a high build rate is needed to drill a well track into a horizontal shape. For example, patent publication No. CN109812256a, "a horizontal well type structure for low permeability shallow reservoir and a drilling method" describes: a horizontal well type structure for a low-permeability shallow oil reservoir comprises a track consisting of a straight well section, a first deflecting section, a stable deflecting section, a second deflecting section and a horizontal section which are sequentially connected end to end; the total length of the horizontal section is 600-800m, and the whole horizontal section is positioned between the top interface and the bottom interface of the target oil layer and comprises a downward inclined horizontal section, a micro-inclination-increasing adjusting section and an upward inclined horizontal section which are sequentially connected; the build-up rate of the first slope building section is more than or equal to that of the second slope building section, and the build-up rate of the first slope building section is 1 degree different from that of the second slope building section; the initial point of the declination horizontal segment is vertically lower than the top interface of the target oil layer by 1-1.5m; the vertical depth of the terminal point of the upward-inclined horizontal section is positioned in the middle of a target oil layer; the projection of the initial point of the micro-inclination-increasing adjustment section is positioned at 2/3 of the connecting line projection of the initial point of the downward inclination horizontal section and the terminal point of the upward inclination horizontal section, and the vertical depth is 1-1.5m above the bottom interface of the target oil layer; the build-up rate of the micro-tilt-increasing adjusting section is 1-3 degrees/30 m; the build-up rate of the micro-tilt-increasing adjusting section is 2 degrees/30 m; the angle of the well track where the starting point of the declined horizontal section is located is 86.50-88.5 degrees; the length of the straight well section is at least equal to the thickness of a loess layer and +60m; the length of the stable slope section is 10-20m. The higher build-up rate causes greater resistance to be met during well completion electrical measurement and casing running, so that electrical measurement instruments and casings are difficult to run, and great failure risk is brought to the whole construction.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a method for drilling and completing a U-shaped oil well by using a slant-straight well drilling machine, which comprises the following steps:
(1) The inclined and straight well drilling machine is arranged according to the design angle and the direction, the inclined and straight well drilling machine is connected with a drill collar and drills the surface layer to the stratum by a drill bit, and a larger borehole, namely a surface casing well section, is drilled; a surface casing is put in, and then cement is injected between the surface casing and the stratum for well cementation, namely a first wellhead;
(2) A blowout preventer is arranged on the well-cemented surface casing pipe, so that well control safety guarantee is provided for the next drilling;
(3) Reconnecting the drilling tool and drilling other well sections; the drilling tool structure is: drilling an inclined straight well section and a directional deviation-increasing well section by using a drill bit, a bent housing power drilling tool, a formation evaluation measurement system while drilling, a measuring instrument while drilling and a drill rod, and drilling downwards by using the drilling tool structure; the formation evaluation while drilling measuring system evaluates the physical parameters of the oil reservoir of the formation at any time, the measurement while drilling instrument measures the well deviation, the orientation and the tool face parameters of the well at any time, and the inclined straight well section, the directional deviation-increasing well section, the horizontal well section and the upper well-picking section are completed until the ground is drilled according to the track required by the design, namely a second well mouth; connecting a steel wire rope on a winch at a second wellhead with a drilling inclined straight well section and a directional deviation-increasing well section by using a drill bit, then starting to pull out the drill, pulling a drilling tool in the well out of the well, and simultaneously pulling the steel wire rope to the first wellhead; completing the drilling work of the U-shaped well;
(4) Carrying out a logging procedure, recognizing the oil layer condition, and determining the position distribution of a screen pipe, a drilling-free plug device and a casing; connecting the pulled steel wire rope with the lower end of an electrical measuring instrument, starting to discharge the electrical measuring instrument from a first wellhead, and simultaneously starting to drag the electrical measuring instrument by a winch positioned at a second wellhead so as to overcome resistance met by the electrical measuring instrument in electrical measurement until the electrical measuring instrument is dragged to the second wellhead; the electric logging truck at the first wellhead begins to drag an electric logging instrument to perform electric logging; during the period, the electric measuring instrument can pull the well logging to the first well mouth and the second well mouth at will under the action of the electric measuring vehicle and the winch at the two ends until the well logging is finished, and the electric measuring instrument is taken out from the first well mouth; the connection between the steel wire rope and the electric measuring instrument is released;
(5) Carrying out drifting operation, namely, descending a drifting drilling tool combination of a drill bit and a drill rod for drilling an inclined straight well section and a directional inclined increasing well section from a first wellhead, and carrying out short tripping operation according to the meeting resistance condition of a well hole in the middle until reaching a second wellhead; at the moment, a casing running frame is prepared at the second wellhead, casing tongs are arranged on the casing running frame, and casing and the like can be buckled;
(6) Starting to run a casing, a drilling-free plug device and a screen pipe, arranging the sequence of running the screen pipe, the drilling-free plug device and the casing according to the stratum conditions judged by the logging results, and starting to run the casing; detaching the inclined straight well section and the directional deviation-increasing well section which are communicated to the second wellhead by using a drill bit, connecting a drill rod behind the inclined straight well section and the directional deviation-increasing well section by using a conversion joint with a casing pipe in a buckling manner, starting to drill by using an inclined straight well drilling machine at the first wellhead, dragging a casing pipe string and starting to put into a well completion pipe string; during the period, the casing and the screen pipe are buckled and connected on a casing running frame at a second wellhead, and a casing string is continuously run in until the casing appears from the first wellhead;
(7) Installing casing heads at the first wellhead and the second wellhead, then sequentially injecting cement into a well cementing truck for cementing, and then pulling out a drilling-free plug device; and completing the whole well drilling, electrical logging and casing cementing work.
And (2) designing a well inclination angle of 45-60 degrees by the inclined straight well drilling machine in the step (1).
And (2) drilling a drill bit phi of 444.5mm for drilling the surface layer in the step (1).
And (2) drilling a surface casing well section in the step (1) to a drilling depth of 30m.
The diameter of the surface casing pipe phi 339.7mm in the step (1) is reduced.
The type of the blowout preventer in the step (2) is FZ21-35.
And (4) drilling a drill bit phi 244.5mm for the inclined straight well section and the directional inclined increasing well section in the step (3), and drilling a power drilling tool phi 171mm with a bent shell.
And (3) drilling rods phi of 127mm.
And (4) the steel wire rope phi is 25.4mm.
And (5) drilling a drill bit phi 244.5mm for the inclined straight well section and the directional deviation-increasing well section.
Compared with the prior art, the invention mainly has the following beneficial technical effects:
1. the invention uses the inclined straight well drilling machine to drill the well from one end to the other end in the shallow oil deposit, and drill the U-shaped oil well with low dogleg degree, and uses the dragging type electric logging and casing method to complete the well, which obviously reduces the difficulty of electric logging and casing, makes the electric logging and casing more easily completed, and the completion pipe column is easier to be put in, thus achieving the purpose of efficiently exploiting the oil in the shallow part of the stratum.
2. The reduction of dog-leg degree can also greatly prolong the service life of the sleeve.
3. The well drilling and completion method is safe and reliable, is simple and convenient to operate, and has good popularization prospect in shallow petroleum areas.
Drawings
The invention is illustrated in the drawings as a whole, but the drawings are not limited to the description.
FIG. 1 shows the first step in the overall construction process of the present invention, with the slant well rig in place according to design requirements.
FIG. 2 shows a schematic representation of the present invention utilizing a slant well rig to initiate drilling of a surface casing wellbore section.
FIG. 3 shows a block diagram of the present invention after running a surface casing, cementing, and installing a blowout preventer.
FIG. 4 shows the working principle of the drill bit, the curved casing power drill, the formation evaluation while drilling measurement system, the measurement while drilling instrument, the drill rod, the inclined straight well section, the directional slant well section, the horizontal well section and the upper picking well section and the structural combination of the drill.
Figure 5 shows a schematic view of the present invention drilling a complete U-shaped well.
FIG. 6 illustrates the present invention after drilling a U-shaped well, connecting the wireline on the winch at the second wellhead to the drill bit, and tripping the drill; and in the process of tripping, the steel wire rope is pulled to the first wellhead from the second wellhead to be connected with an electrical measuring instrument.
FIG. 7 illustrates the process of electrical logging of the present invention, i.e., connecting a wire rope that has been pulled from a second wellhead to a first wellhead, where the electrical logging instrument is lowered by a cable for electrical logging, while a winch at the second wellhead pulls the electrical logging instrument to move toward the second wellhead; the electric measurement of each well section can be carried out at will according to the electric measurement requirement until the electric measurement task is completed.
FIG. 8 is a diagram illustrating the connection of the present invention to a completion string at the second wellhead after the wireline assembly has been electrically tripped out of the surface at the second wellhead.
FIG. 9 is a block diagram of the present invention after the connection of the drift and casing by the crossover joint.
FIG. 10 is a schematic representation of a wellbore configuration of the present invention in preparation for cementing after completion of pulling a completion string at a second wellhead from a first wellhead using a drilling tool.
In the figure: 1-inclined straight well drilling machine, 2-drill collar, 3-drill bit for surface layer, 4-surface casing well section, 5-blowout preventer, 6-surface casing, 7-cement, 8-inclined straight well section and directional deviation-increasing well section, 9-drill bit for inclined straight well section and directional deviation-increasing well section, 10-bent housing power drilling tool, 11-formation evaluation and measurement system while drilling, 12-measurement-while-drilling instrument, 13-drill rod, 14-horizontal well section, 15-upper-picking well section, 16-steel wire rope, 17-winch, 18-electric measurement instrument, 19-electric measurement cable, 20-lower casing rack, 21-upper buckle device, 22-sieve tube, 23-drilling-free device, 24-casing, 25-conversion joint and 26-casing head.
Detailed Description
To further illustrate the implementation of the present invention, the following detailed description is given with reference to the accompanying drawings and examples to explain the detailed implementation, structural features and efficacy of the present invention.
It is specifically noted that the descriptions of various positions in the description, as well as the descriptions of the dimensions of various elements, are only for the purpose of illustrating the processes performed by the present invention clearly and are not intended to indicate that the components described must have particular dimensions, and therefore, should not be construed as limiting the invention.
Example 1
Referring to fig. 1, a method of drilling and completing a U-well with a slant-straight drilling rig positioned at 90 ° and 45 ° relative to the design requirements and oriented for drilling.
Referring to fig. 2, a drill bit 3 for drilling the surface with the diameter of 444.5mm is used for drilling a surface casing well section 4, the drill bit 3 for drilling the surface is connected with a drill collar 2 with the diameter of 177.8mm, the surface casing well section 4 is drilled at a design angle of 45 degrees, the drilling depth is 30m, and preparation is made for drilling an inclined straight well section, a directional deviation-increasing well section 8 and a horizontal well section 14 in the next step.
Referring to fig. 3, after drilling the surface casing well section 4, the surface casing 6 with the diameter of 339.7mm is put in for well cementation, and cement 7 is injected between the surface casing 6 and the stratum for well cementation; during the waiting period, a blowout preventer 5 of the type FZ21-35 was installed to provide conditions for drilling of the subsequent wellbore section.
Referring to fig. 4, an inclined straight well section, a directional deviation-increasing well section 8, a horizontal well section 14 and an upper picking well section 15 are drilled; the drill bit 9 for drilling the inclined straight well section with phi 244.5mm and the directional deviation-increasing well section is connected with the bent shell power drilling tool 10 with phi 171mm, the formation evaluation and measurement system 11 while drilling, the measurement instrument 12 while drilling and the drill rod 13 with phi 127mm, and the rotary power provided by the inclined straight well drilling machine 1 and the drilling fluid drive the bent shell power drilling tool 10 with phi 171mm to jointly drive the drill bit 9 for drilling the inclined straight well section and the directional deviation-increasing well section to drill downwards in a rotating mode.
Referring to fig. 5, in the whole drilling process, according to the stratum evaluation while drilling system 11 and the control of the measurement while drilling instrument 12 on the well orbit, the rotary table drilling and the power drill are adopted to drill the well directionally, and the ground is drilled according to the designed orbit requirement to form a second well mouth.
Referring to fig. 6, after drilling the inclined straight well section and the directional deviation-increasing well section, the drill bit 9 for drilling the inclined straight well section and the directional deviation-increasing well section is used for leading the drill bit 9 for drilling the inclined straight well section and the directional deviation-increasing well section to be connected with the drill bit 9 for drilling the inclined straight well section and the directional deviation-increasing well section, at this time, the steel wire rope 16 with the diameter of 25.4mm on the winch 17 placed at the second well mouth is connected with the drill bit 9 for drilling the inclined straight well section and the directional deviation-increasing well section, the inclined straight well drilling machine 1 pulls the whole drill bit to the first well mouth for drilling, and after all the drill bits are pulled out, the steel wire rope 16 is also pulled to the first well mouth for connecting the electric logging instrument 18 during the step electric logging.
Referring to fig. 7, at a first wellhead, a steel wire rope 16 is connected with an electrical measuring instrument 18, the rear part of the electrical measuring instrument 18 is connected with an electrical measuring cable 19, a winch 17 starts to drag the electrical measuring instrument 18 to move to a second wellhead, and meanwhile, a roller on an electrical measuring truck at the first wellhead slowly discharges the electrical measuring cable 19 and the electrical measuring instrument 18, so that logging can be performed in the process of pulling to the second wellhead, or logging can be performed while the electrical measuring cable 19 is pulled to move to the first wellhead by the electrical measuring truck at the first wellhead after the electrical measuring instrument 18 is pulled to the second wellhead; the specific logging procedure is performed according to the requirements of the electrical logging program.
Referring to fig. 8, after the electrical logging is completed, the well dredging is started; the drifting drilling tool is used for drifting with a straight well section with the diameter phi of 244.5mm and a directional deviation-increasing well section, and a drill bit 9 is connected with a drill rod 13 to drift to a second wellhead until the drifting drilling tool reaches the second wellhead; at this point the winch 17 at the second wellhead is removed and the casing running rig 20 and make-up 21 are installed, ready for casing running operations.
Referring to fig. 9, the drill bit 9 for drilling the inclined straight well section and the directional slant increasing well section is detached, the conversion joint 25 is installed at the position of the drill bit 9 for drilling the inclined straight well section and the directional slant increasing well section, the conversion joint 25 is connected with the upper casing 24, the inclined straight well drilling machine 1 starts to drill, and the drilling tool and the casing string are pulled to drill at the first well mouth.
Referring to fig. 10, during tripping, the casing 24, the drilling-free plug 23, the screen 22, etc. are connected behind the crossover sub 25 one by one until all completion tubulars are strung into the wellbore as designed, and the last casing 24 is connected to the casing head 26 in preparation for cementing; and (3) connecting well cementing equipment at two sides, injecting cement 7 into the well section above the drilling-free plug device 23, and after the cement 7 is injected, pulling out a core in the drilling-free plug device 23 by a lower small drill rod to finish the whole drilling and completion work, namely Hou Ninggu well.
Example 2
In the example, the drilling angle of the inclined straight well drilling machine 1 is adjusted to 60 degrees, and the sizes of all the casings are reduced by one grade; the surface casing 6 has a size of 273.1mm phi, the completion string has a size of 139.7mm phi, and other operations are the same as in example 1.
The foregoing is a further detailed description of the invention in connection with specific preferred embodiments and it is not intended to limit the invention to the specific embodiments described. For those skilled in the art to which the present invention pertains, a number of simple deductions or substitutions can be made without departing from the concepts of U-well drilling, towed logging, and towed casing running for the slant wells of the present invention, and all shall be considered to fall within the scope of the present invention.
Claims (10)
1. A method for drilling and completing a U-shaped oil well by using a slant/straight well drilling machine is characterized by comprising the following steps:
the method comprises the following steps that (1) a slant and straight well drilling machine (1) is arranged at a proper position according to a design angle and a design direction, the slant and straight well drilling machine (1) is connected with a drill collar (2) and a drill bit (3) for drilling a surface layer to drill a stratum, and a larger well hole, namely a surface casing well section (4), is drilled; a surface casing (6) is lowered, and then cement (7) is injected between the surface casing (6) and the stratum for well cementation, namely a first wellhead;
(2) A blowout preventer (5) is arranged on a surface casing (6) after well cementation is finished, so that well control safety guarantee is provided for next drilling;
(3) Reconnecting the drilling tool and drilling the rest well sections; the drilling tool structure is: drilling an inclined straight well section and a directional deviation-increasing well section by using a drill bit (9), a bent shell power drilling tool (10), a formation evaluation and measurement while drilling system (11), a measurement while drilling instrument (12) and a drill rod (13), and drilling downwards by using the drilling tool structure; the formation evaluation and measurement while drilling system (11) evaluates the physical parameters of the oil reservoir of the formation at any time, the measurement while drilling instrument (12) measures the well deviation, the azimuth and the tool face parameters of the well at any time, and completes the inclined and straight well section, the directional deviation-increasing well section (8), the horizontal well section (14) and the upper well-picking section (15) until the ground is drilled according to the track required by design, and the ground is a second well mouth; connecting a steel wire rope (16) on a winch (17) positioned at the second wellhead with an inclined straight well drilling section and an oriented inclined increasing well drilling section by using a drill bit (9), starting to pull out the drill, pulling out a drilling tool in the well hole, and simultaneously pulling the steel wire rope (16) to the first wellhead; completing the drilling work of the U-shaped well;
(4) Carrying out a logging procedure, recognizing the oil layer condition, and determining the position distribution of a screen pipe (22), a drilling-free device (23) and a casing pipe (24); connecting the pulled steel wire rope (16) with the lower end of an electrical measuring instrument (18), starting to lower the electrical measuring instrument (18) from the first wellhead, and simultaneously starting to drag the electrical measuring instrument (18) by a winch (17) positioned at the second wellhead so as to overcome the resistance met by the electrical measuring instrument (18) in electrical measurement until the electrical measuring instrument (18) is dragged to the second wellhead; the electrical measurement vehicle at the first well mouth starts to drag an electrical measurement instrument (18) to perform electrical measurement; during the period, the electric logging instrument (18) can pull the logging to the first well head direction and the second well head direction randomly under the action of the electric logging trolley and the winch (17) at two ends until the logging is finished, and the electric logging instrument (18) is taken out from the first well head; the connection between the steel wire rope (16) and the electric measuring instrument (18) is released;
(5) Carrying out drifting operation, namely adopting a drifting drilling tool combination of a drill bit (9) and a drill rod (13) for drilling an inclined straight well section and a directional inclined increasing well section to go down from a first well mouth, and carrying out short tripping operation in the middle according to the meeting resistance condition of a well hole until reaching a second well mouth; preparing a casing running frame (20) at a second wellhead, wherein a casing clamp is arranged on the casing running frame (20) and can be used for buckling a casing (24), a sieve tube (22) and a drilling-free device (23);
(6) Starting to set a casing (24), a drilling-free device (23) and a screen pipe (22), arranging the setting sequence of the screen pipe (22) and the casing (24) according to the stratum conditions judged by the logging results, installing the drilling-free device (23) between the casing (24) and the screen pipe (22), and starting to set the casing; the method comprises the following steps that a drill bit (9) for an inclined straight well section and a directional deviation-increasing well section which are communicated to a second well opening is detached, a conversion joint (25) is used for connecting a drill rod (13) behind the drill bit (9) for the inclined straight well section and the directional deviation-increasing well section with a casing (24) in a buckling mode, an inclined straight well drilling machine (1) at the first well opening starts to drill, and a casing string is dragged to start to be lowered into a well completion pipe string; during which the casing (24), the drilling-free device (23) and the screen (22) are made up-lock on the casing running stand (20) at the second wellhead, and the casing string is continuously run until the casing (24) emerges from the first wellhead;
(7) Installing casing heads (26) at the first and second wellheads, then sequentially injecting cement (7) with a cementing truck for cementing, and then pulling out the drilling-free device (23); and completing the whole well drilling, electrical logging and casing cementing work.
2. The method for drilling and completing a U-shaped well with a slant well drilling rig according to claim 1, wherein the step (1) of the slant well drilling rig (1) is designed with a well angle of 45 ° to 60 °.
3. The method of drilling and completing a U-well with a deviated and straight well drilling machine according to claim 1 wherein step (1) drilling the surface with a drill bit (3) phi 444.5mm.
4. The method of drilling and completing a U-well with a slant entry well drill according to claim 1 wherein step (1) drills the surface casing interval (4) to a depth of 30m.
5. The method of drilling and completing a U-well with a slant entry well rig according to claim 1 wherein step (1) surface casing (6) Φ 339.7mm.
6. A method of drilling and completing a U-shaped well with a deviated and straight well drilling machine according to claim 1 wherein step (2) the blowout preventer (5) is of type FZ21-35.
7. The method of claim 1, wherein step (3) comprises drilling the deviated well section and the directional deviation-increasing well section with a drill bit (9) phi 244.5mm and a bent casing power drill (10) phi 171mm.
8. A method of drilling and completing a U-shaped well with a slant entry well drilling rig according to claim 1 wherein step (3) involves drilling a pipe (13) of 127mm Φ.
9. A method of drilling and completing a U-shaped well with a deviated and straight well drilling machine according to claim 1 wherein said step (3) and step (4) wireline (16) is 25.4mm Φ.
10. The method of drilling and completing a U-well with a slant entry well drilling rig as claimed in claim 1 wherein said step (5) of drilling the slant entry well section and the directional enhanced deviation well section is performed with a drill bit (9) of phi 244.5mm.
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| CN115637926B true CN115637926B (en) | 2023-02-28 |
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| CN114165215A (en) * | 2020-08-21 | 2022-03-11 | 中国石油天然气股份有限公司 | Logging conveying device and logging conveying method |
| CN114909119A (en) * | 2022-04-29 | 2022-08-16 | 大庆辰平钻井技术服务有限公司 | Drilling method for converting original vertical well or inclined well into U-shaped geothermal well with ultra-short radius |
| CN114991750A (en) * | 2022-06-16 | 2022-09-02 | 利丰新能源技术(山东)股份有限公司 | Casing pipe connecting method for U-shaped totally-enclosed geothermal communication well |
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2022
- 2022-12-23 CN CN202211660034.4A patent/CN115637926B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3316051A1 (en) * | 1983-05-03 | 1984-11-08 | Erno Raumfahrttechnik Gmbh, 2800 Bremen | Transportable drilling system |
| CN1682007A (en) * | 2002-07-25 | 2005-10-12 | 施蓝姆伯格海外股份有限公司 | Drilling method |
| CN101218459A (en) * | 2005-03-14 | 2008-07-09 | 单浮筒系泊公司 | Riser installation from offshore floating production unit |
| CN109812256A (en) * | 2019-03-28 | 2019-05-28 | 陕西延长石油(集团)有限责任公司研究院 | A kind of horizontal well well structure and boring method for hyposmosis shallow oil reservoir |
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| CN114909119A (en) * | 2022-04-29 | 2022-08-16 | 大庆辰平钻井技术服务有限公司 | Drilling method for converting original vertical well or inclined well into U-shaped geothermal well with ultra-short radius |
| CN114991750A (en) * | 2022-06-16 | 2022-09-02 | 利丰新能源技术(山东)股份有限公司 | Casing pipe connecting method for U-shaped totally-enclosed geothermal communication well |
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| CN115637926A (en) | 2023-01-24 |
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