CN107060642A - Horizontal well track control method being connected trona deep-thin layer more - Google Patents
Horizontal well track control method being connected trona deep-thin layer more Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 16
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 title claims abstract description 11
- 241001625808 Trona Species 0.000 title claims abstract description 11
- 238000005259 measurement Methods 0.000 claims abstract description 32
- 238000013461 design Methods 0.000 claims abstract description 26
- 238000005516 engineering process Methods 0.000 claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000012937 correction Methods 0.000 claims abstract description 7
- 238000005457 optimization Methods 0.000 claims abstract description 7
- 238000003032 molecular docking Methods 0.000 claims abstract description 6
- 238000005553 drilling Methods 0.000 claims description 19
- 239000003513 alkali Substances 0.000 claims description 18
- 238000010276 construction Methods 0.000 claims description 16
- 238000006073 displacement reaction Methods 0.000 claims description 7
- 150000001875 compounds Chemical class 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 5
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 4
- 239000011707 mineral Substances 0.000 claims description 4
- 238000004458 analytical method Methods 0.000 claims description 3
- 238000010835 comparative analysis Methods 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 claims description 3
- 230000001186 cumulative effect Effects 0.000 claims description 3
- 238000010348 incorporation Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000011084 recovery Methods 0.000 claims description 3
- 230000009897 systematic effect Effects 0.000 claims description 3
- 241001074085 Scophthalmus aquosus Species 0.000 claims 1
- 239000007788 liquid Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 241000286609 Chuco Species 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- 235000020681 well water Nutrition 0.000 description 1
- 239000002349 well water Substances 0.000 description 1
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
- E21B7/04—Directional drilling
-
- 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
- E21B44/00—Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator, e.g. computer-controlled drilling systems; Systems specially adapted for monitoring a plurality of drilling variables or conditions
-
- 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
-
- 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
- E21B7/046—Directional drilling horizontal drilling
-
- 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
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- Mining & Mineral Resources (AREA)
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- Geochemistry & Mineralogy (AREA)
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- Geophysics And Detection Of Objects (AREA)
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Abstract
The invention discloses a kind of trona deep layer tee joint horizontal well track control method, it is characterised in that includes following steps：（1）, doubly-linked lead to the optimization design of Trajectory of Horizontal Well section；（2）, error correction techniques；（3）, LWD merged with RMRS measurement and well track precision Control Technology.Solve the problem of deep layer doubly-linked water flowing horizontal well Section Design；Using conventional LWD measuring instruments, introduce RMRS e measurement technologies, realized " trying to make a match " by the precise controlling of well track, in vertical depth 2981m and 3013m, oblique depth 3239.5m has connected two mouthfuls of Φ 118mm and Φ 105mm straight well wells at one stroke with 3512.6m, is successfully realized " point-to-point " docking.
Description
Technical field
The invention belongs to trona production technique field, and in particular to horizontal well well is connected a kind of trona deep-thin layer more
Method for controlling trajectory.
Background technology
It is the special technique grown up in recent years to orient the well technology that is docked and connected, and at present, China is mainly used in
The exploitation of soluble well mineral resources and the exploitation of coal bed gas.It is to use directional well horizontal well technology, makes a certain depth in underground
At a distance of hundreds of meters, even above two mouthfuls of km or multiple wells eye orientation are docked and connected, and realize the technology that many well connections are efficiently dug up mine.With
The progress of directional horizontal wellss technology and survey tool instrument, makes it possible that the point point between well and well is connected, and
Adopt alkali and adopt in the high-efficiency mining of the field such as salt and obtain extensive popularization and application.Being applied at present country's connection technology in coal bed gas money more
Source, alkali ore deposit is few using connection technology, and utilizes double connection technologies more beyond example.Connection horizontal well drilling supporting technology is alkali money
Source exploitation provides strong technical support, while connected well technology has been widely used for shale gas exploitation field, studies and answers
With this technology, drilling well survival and development space certainly will be expanded, to oil-field thick-oil SAGD (Steam
Assistance Gravity Drive) high efficient mining technology（Double-layer water horizontal well）There is stronger directive significance.
Following difficult point is primarily present in hole trajectory control：
1. Section Design is difficult：
Alkali well water horizontal well design profile is different from common horizontal well, not only to consider that A, B target enter target orientation and unanimously, and connected
80m needs to be designed to hold angle before target spot, it is necessary to give deflecting tool when the target point of design target spot and RMRS apparatus measures is inconsistent
Stay enough abilities（Build angle rate）Go to the track of adjustment connection control section；
2. well track accurately controls to require high：
The precise controlling of well track, will construct before connection in strict accordance with planned course, if off-design track is remote, with connecting
Deviate big with connecting target after RMRS instrument communications, means capability can not adjust well track to connection target point, it is necessary to backfill
Sidetracking realizes connection purpose.3000 meters or so deep layers connect two mouthfuls of straight wells, and two straight well borehole diameters are small, respectively Φ 118mm
With Φ 105mm wells, accurate point-to-point connected well；Straight well well is deeper, and the accumulated error of wellbore data is big, and the accuracy of data is straight
Connect and decide and can once connect, target spot data error is big, track adjustment can not be realized, connection failure will be caused, it is necessary to backfill
Certain distance removes sidetracking；
3rd, connection target well is small, and connection difficulty is high：
The A point B points of two connection target straight wells connect difficulty from reduction, should build molten chamber diameter after groove (expanding molten chamber) and become greatly half
More than rice, it is more beneficial for " point-to-point " connection between two wells；But it is excessive to build molten chamber after groove, underground is dangerous during to crossing A points, easily meets
Resistance etc., thus groove (expanding molten chamber) is not built, directly connect drilling well Φ 118mm and Φ 105mm wells with stepout well Φ 216mm wells
Eye, target point is too small, and " point-to-point " connection difficulty of construction is big.
The content of the invention
The present invention is the Section Design for solving the problems, such as the connection of deep water horizontal well, fine TRAJECTORY CONTROL, realizes accurate " point pair
Point " connection docking, improves and docks one-time success rate, and horizontal well track controlling party is connected a set of trona deep-thin layer of formation more
Method.
To achieve the above object, the technical solution adopted by the present invention：Horizontal well well rail is connected the trona deep-thin layer more
Mark control method, it is characterised in that include following steps：
（1）, doubly-linked lead to the optimization design of Trajectory of Horizontal Well section
The characteristics of for alkali ore deposit purpose layer depth, incorporation engineering situation, optimization doubly-linked water flowing horizontal well Section Design is difficult to reduce construction
Degree；
（2）, error correction techniques
At 2500-3100 meters, the accumulated error of measurement data is big, thus must carry out school to the basic data for connecting phase closing well
Just.One is that well data is corrected, two mouthfuls of straight well well track measurement data and mouth coordinate, the correction error of ground elevation,
Data to target well carry out error analysis, and the data main source of target well is magnetic list multiple shot tool, and electrical measurement is continuously surveyed
Oblique instrument, electronics list multiple shot tool, these data have human error and systematic error.It can be dropped by checking human error
To accuracy of instrument, according to measuring instrument type, the wellbore trajectory data of the directional well of accuracy rating, analyzer are calculated
Horizontal displacement and the error range of vertical depth that device precision is caused, the oblique data of well track must be surveyed by carrying out high accuracy gyroscope to old well,
So as to calculate the horizontal displacement trueness error of target well, it is determined that reducing error as far as possible before well location and construction.Two be construction
Well is reduced and planned course measured deviation, in connectivity points using high accuracy LWD measurement while-drilling instruments monitoring construction well bore track
Preceding 100 meters of tripping in RMRS（Rotary magnetic range-measurement system）Set up and communicate with target as early as possible, correct positive drilling well cumulative departure, really
Protect accurate commutation；
（3）, LWD merged with RMRS measurement and well track precision Control Technology
The difficult point such as be difficult to grasp for the deep alkali layer easy corrosion in loose, stratum of alkali ore deposit, drilling tool deflecting rule, carry out deflecting tool, LWD with
Bore the preferred of measuring instrument, it is ensured that accurate measurements and control well track, improve the precision of prediction to shaft bottom hole deviation, orientation, to
RMRS provides accurate downhole data information, and RMRS could feed back accurate relative coordinate, and then accurate guiding well rail
Mark advances to target spot direction, realizes " point-to-point " accurate commutation.
Orient the well technology that is docked and connected and realize that two wells or many wells are directly docked and connected in purpose mined bed：" note, molten, adopt " one
Body, water filling is big with mineral reserve contact area, and buck yield is high with content, and control ore faces product is big, and resource utilization is high, and recovery well
Production management is simple, small to ground and stratum dirt.
The wellbore trajectory control technology includes：
（1）Straight well section control
The straight well section of horizontal connected well helps screw rod to creep into using double, and direction of deflection is adjusted at any time.Hole deviation is controlled before kickoff point (KOP), is controlled
Closure as far as possible falls direction of closure to be conducive to the identical rhumb line with planned course away within scope of design 30m
On；
（2）Inclination section is controlled
By comparative analysis, singly help 1.25 degree of screw rods not only to can guarantee that build angle rate but also compound half root can be taken, slide the mode of half root,
Ensure that well track is smooth, reach the fast effect bored and crept into strict accordance with design profile.Hole deviation, orientation will be kept with design
Unanimously, next step connection construction is conducive to；
（3）The precise controlling of borehole track during connection
Accurate control well track is run along design lines, and connection docking requires accurate to shaft bottom hole deviation, bearing prediction, and this will
Seek the performance to drilling tool（The increasing drop angle situation of build angle rate and compound tense during slip）Grasp accurate, it is to avoid shadow when prediction deviation is big
Ring RMRS accurate guiding, drilling is to away from before A targets during about 100m or so, the tripping in RMRS instruments in connected well is treated, while to be
RMRS engineer provides accurately estimated shaft bottom hole deviation, orientation, vertical depth, relatively northern coordinate, relatively eastern coordinate；By straight
Software calculates relative distance and deflecting angle of the target spot relative to drill bit (strong magnetic short section) after the RMRS measurements of well, instructs orientation work
Cheng Shi continues to creep into after adjusting track, adjustment orientation according to feedback data, often creeps into 5~10m, connects measurement once, so
Repeatedly, constantly adjustment well track makes drill bit alignment target well, so as to realize that " point-to-point " " trying to make a match " completes connection.
Using the beneficial effect of above-mentioned technical proposal：The HV027-8 wells of applicant are applied to using inventive technique, should
HV027-8 wells are that the first for pacifying canopy alkali ore deposit arrangement adopts alkali doubly-linked water flowing horizontal well.This well is three to drive a well body structure, protective casing
（Lower 1500 meters of depth）Leakage chuco is gushed on sealing top, and three open as Φ 216mm wells, design well depth 3504m, kickoff point (KOP) 2700m, most
Big 83.47 ° of hole deviation, A range well head 387m are connected, B range wells at 2981.9 meters of vertical depth with VT012-8 well Φ 118mm wells
Mouthful 657m, in vertical depth, 3013 meters connects with VT013-8 alkali well Φ 105mm wells, the well drill purpose be an attempt to utilize new technology,
New technology Efficient Development alkali resource.By complex art optimal enforcement, the whole nine yards connects two mouthfuls of straight wells：HV027-8 wells Φ
216mm wells are connected at the m of well depth 3239.5 with A target VT012-8 well Φ 118mm wells, with B targets at well depth 3512.6m
VT013-8 well Φ 105mm wells are connected, and are successfully realized " point-to-point " docking, realize " note, molten, adopt " integration, big displacement,
Tee joint, ultra-long horizontal section, high Drilling ratio, yield are high, and quality is good, and Area of a well is big, and resource utilization is high, to ground and
Stratum dirt is small, achieves preferable effect and significant economic and social profit；Realize domestic deep layer Φ 216mm wells first with
The disposable accurate commutation of Φ 108mm and Φ 105mm wells；HV027-8 wells are connected successfully only with 62 days, plus straight well is led eye and amounted to
83 days, than 28.5 days in advance 112.5 days of design.The yield of alkali ore deposit is also greatly improved：Straight well individual well produces liquid daily（Pressure break aftereffect
Really）500m3, liquid is produced after connection（Not pressure break）1000m3, it is 2 times of single straight well production liquid, production effect is preferable.
Embodiment
The trona deep layer tee joint horizontal well track control method, it is characterised in that include following steps：
（1）, doubly-linked lead to the optimization design of Trajectory of Horizontal Well section
The characteristics of for alkali ore deposit purpose layer depth, incorporation engineering situation, optimization doubly-linked water flowing horizontal well Section Design is difficult to reduce construction
Degree；
（2）, error correction techniques
At 2500-3100 meters, the accumulated error of measurement data is big, thus must carry out school to the basic data for connecting phase closing well
Just.One is that well data is corrected, two mouthfuls of straight well well track measurement data and mouth coordinate, the correction error of ground elevation,
Data to target well carry out error analysis, and the data main source of target well is magnetic list multiple shot tool, and electrical measurement is continuously surveyed
Oblique instrument, electronics list multiple shot tool, these data have human error and systematic error.It can be dropped by checking human error
To accuracy of instrument, according to measuring instrument type, the wellbore trajectory data of the directional well of accuracy rating, analyzer are calculated
Horizontal displacement and the error range of vertical depth that device precision is caused, the oblique data of well track must be surveyed by carrying out high accuracy gyroscope to old well,
So as to calculate the horizontal displacement trueness error of target well, it is determined that reducing error as far as possible before well location and construction.Two be construction
Well is reduced and planned course measured deviation, in connectivity points using high accuracy LWD measurement while-drilling instruments monitoring construction well bore track
Preceding 100 meters of tripping in RMRS（Rotary magnetic range-measurement system）Set up and communicate with target as early as possible, correct positive drilling well cumulative departure, really
Protect accurate commutation；
（3）, LWD merged with RMRS measurement and well track precision Control Technology
The difficult point such as be difficult to grasp for the deep alkali layer easy corrosion in loose, stratum of alkali ore deposit, drilling tool deflecting rule, carry out deflecting tool, LWD with
Bore the preferred of measuring instrument, it is ensured that accurate measurements and control well track, improve the precision of prediction to shaft bottom hole deviation, orientation, to
RMRS provides accurate downhole data information, and RMRS could feed back accurate relative coordinate, and then accurate guiding well rail
Mark advances to target spot direction, realizes " point-to-point " accurate commutation.
Orient the well technology that is docked and connected and realize that two wells or many wells are directly docked and connected in purpose mined bed：" note, molten, adopt " one
Body, water filling is big with mineral reserve contact area, and buck yield is high with content, and control ore faces product is big, and resource utilization is high, and recovery well
Production management is simple, small to ground and stratum dirt.
The wellbore trajectory control technology includes：
（1）Straight well section control：The straight well section of horizontal connected well helps screw rod to creep into using double, and direction of deflection is adjusted at any time.Kickoff point (KOP)
Preceding control hole deviation, control closure as far as possible falls direction of closure to be conducive to and planned course away within scope of design 30m
Identical rhumb line on；
（2）Inclination section is controlled：By comparative analysis, singly help 1.25 degree of screw rods not only to can guarantee that build angle rate but also compound half root can be taken,
Slide the mode of half root, it is ensured that well track is smooth, reach the fast effect bored and crept into strict accordance with design profile.Hole deviation, side
Position will be consistent with design, be conducive to next step connection construction；
（3）The precise controlling of borehole track during connection：Accurate control well track is run along design lines, and connection docking is required to well
Bottom hole deviation, bearing prediction are accurate, and this requires the performance to drilling tool（The increasing drop angle feelings of build angle rate and compound tense during slip
Condition）It is accurate to grasp, it is to avoid influence RMRS accurate guiding when prediction deviation is big, and drilling before A targets to away from during about 100m or so, treating
Tripping in RMRS instruments in connected well, while to provide accurately estimated shaft bottom hole deviation, orientation for RMRS engineer, hang down
Deep, relatively northern coordinate, relatively eastern coordinate；Calculating target spot by software after the RMRS measurements of straight well, (strong magnetic is short relative to drill bit
Section) relative distance and deflecting angle, instruct orientation engineer to adjust track according to feedback data, continue to bore behind adjustment orientation
Enter, often creep into 5~10m, once, so repeatedly, constantly adjustment well track makes drill bit alignment target well for connection measurement, so that
Realize that " point-to-point " " trying to make a match " completes connection.
Claims (3)
1. connecting horizontal well track control method a kind of trona deep-thin layer, it is characterised in that include following steps more：
（1）, doubly-linked lead to the optimization of Trajectory of Horizontal Well section
The characteristics of for alkali ore deposit purpose layer depth, incorporation engineering situation, many connection horizontal well Section Designs of optimization are difficult to reduce construction
Degree；
（2）, error correction
At 2500-3100 meters, the accumulated error of measurement data is big, and the basic data for connecting phase closing well is corrected,
One is that well data is corrected, two mouthfuls of straight well well track measurement data and mouth coordinate, the correction error of ground elevation,
Data to target well carry out error analysis, and the data main source of target well is magnetic list multiple shot tool, and electrical measurement is continuously surveyed
Oblique instrument, electronics list multiple shot tool, these data have human error and systematic error, can dropped by checking human error
To accuracy of instrument, according to measuring instrument type, the wellbore trajectory data of the directional well of accuracy rating, analyzer are calculated
Horizontal displacement and the error range of vertical depth that device precision is caused, the oblique data of well track must be surveyed by carrying out high accuracy gyroscope to old well,
So as to calculate the horizontal displacement trueness error of target well, it is determined that reducing error as far as possible before well location and construction；Two be construction
Well is reduced and planned course measured deviation, in connectivity points using high accuracy LWD measurement while-drilling instruments monitoring construction well bore track
Preceding 100 meters of tripping in rotary magnetic range-measurement system RMRS sets up with target communicate as early as possible, corrects positive drilling well cumulative departure, it is ensured that
Accurate commutation；
（3）, LWD merged with rotary magnetic range-measurement system RMRS measurement and well track precision Control Technology
It is difficult to grasp difficult point for the deep alkali layer easy corrosion in loose, stratum of alkali ore deposit, drilling tool deflecting rule, carries out deflecting tool, LWD with brill
Preferred, accurate measurements and the control well track of measuring instrument, improve the precision of prediction to shaft bottom hole deviation, orientation, to rotary magnetic
Range-measurement system RMRS provides accurate downhole data information, and rotary magnetic range-measurement system RMRS could feed back accurate relative seat
Mark, and then accurate guiding well track realizes point-to-point accurate commutation to the advance of target spot direction.
2. connecting horizontal well track control method trona deep-thin layer according to claim 1 more, it is characterised in that：
Orient the well technology that is docked and connected and realize that two wells or many wells are directly docked and connected in purpose mined bed：" note, molten, adopt " one
Change, water filling is big with mineral reserve contact area, buck yield is high with content, control ore faces product is big, and resource utilization is high, and the life of recovery well
Production management is simple, small to ground and stratum dirt.
3. connecting horizontal well track control method trona deep-thin layer according to claim 1 more, it is characterised in that：
The wellbore trajectory control technology includes：
（1）Straight well section control：The straight well section of horizontal connected well helps screw rod to creep into using double, and direction of deflection, kickoff point (KOP) are adjusted at any time
Preceding control hole deviation, control closure as far as possible falls direction of closure to be conducive to and planned course away within scope of design 30m
Identical rhumb line on；
（2）Inclination section is controlled：By comparative analysis, singly help 1.25 degree of screw rods not only to can guarantee that build angle rate but also compound half root can be taken,
Slide the mode of half root, it is ensured that well track is smooth, reach the fast effect bored and crept into strict accordance with design profile, hole deviation, side
Position will be consistent with design, be conducive to next step connection construction；
（3）The precise controlling of borehole track during connection：Accurate control well track is run along design lines, and connection docking is required to well
Bottom hole deviation, bearing prediction are accurate, and the performance of the increasing drop angle situation of the build angle rate and compound tense when being slided to drilling tool grasps accurate,
RMRS accurate guiding is influenceed when avoiding prediction deviation big, when drilling is to away from 100m before A targets or so, the tripping in connected well is treated
RMRS instruments, at the same to be provided for RMRS engineer accurately estimated shaft bottom hole deviation, orientation, vertical depth, relatively northern coordinate,
Relatively eastern coordinate；By software after the RMRS of straight well measurement calculate target spot relative to the relative distance of drill bit (strong magnetic short section) and
Deflecting angle, instructs orientation engineer to continue to creep into after adjusting track, adjustment orientation according to feedback data, often creeps into 5~10m,
Once, so repeatedly, constantly adjustment well track makes drill bit alignment target well, so as to realize that " point-to-point " " wears for connection measurement
Pin lead " completes connection.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108071340A (en) * | 2017-12-12 | 2018-05-25 | 大港油田集团有限责任公司 | A kind of well track designs preferred method |
| CN109057768A (en) * | 2018-08-02 | 2018-12-21 | 四川盐业地质钻井大队 | Recovery method suitable for thin interbed native soda deposit |
| CN109184693A (en) * | 2018-09-06 | 2019-01-11 | 四川盐业地质钻井大队 | The old mining area old well production potential tapping technique of rock salt |
| 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 |
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