CN112696173A - One-trip drilling high-pressure well washer and well washing method for geothermal well - Google Patents
One-trip drilling high-pressure well washer and well washing method for geothermal well Download PDFInfo
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- 238000005553 drilling Methods 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000005406 washing Methods 0.000 title abstract description 28
- 238000004364 calculation method Methods 0.000 claims abstract description 19
- 239000012530 fluid Substances 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
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- 230000015572 biosynthetic process Effects 0.000 claims description 21
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- 239000008186 active pharmaceutical agent Substances 0.000 claims description 20
- 238000002347 injection Methods 0.000 claims description 19
- 239000007924 injection Substances 0.000 claims description 19
- 238000011010 flushing procedure Methods 0.000 claims description 12
- 230000035699 permeability Effects 0.000 claims description 12
- 239000011148 porous material Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 7
- 230000008859 change Effects 0.000 claims description 3
- 238000012937 correction Methods 0.000 claims description 3
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- 239000004576 sand Substances 0.000 claims description 3
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Abstract
The utility model relates to a well drilling technical field discloses a geothermal well one trip bores high pressure well washer, be greater than 139.7mmAPI sleeve pipe including a hollow external diameter, the sleeve pipe body is provided with a plurality of jet orifices, sheathed tube one end is connected with oil pipe joint, oil pipe articulate oil pipe, the cover is located intraductal to the oil pipe cover, sheathed tube other end pipe diameter reduces and is down trapezoidal form, inside is provided with the bowling, the bowling is supporting with sheathed tube shape pipe diameter of falling trapezoidal form, can realize sealed effect, forms the radial ejector of the formula of throwing in the area, the outside of the sleeve pipe other end is provided with the guide shoe. A well washing method of the geothermal well one-trip drilling high-pressure well washer is also disclosed. The method and the device can completely meet the aims of replacing the drilling fluid at low pressure and jetting the radial jet to wash the well at high pressure, achieve the purpose of completing the displacement of the drilling fluid and jetting the well washing operation of the jet on the inner wall of the water filter pipe by the high-pressure jet device after one-time drilling, and save 20 ten thousand yuan for a single well at least from the cost calculation of well drilling and completion.
Description
Technical Field
The application relates to the technical field of drilling, in particular to a one-trip drilling high-pressure well washer and a well washing method for a geothermal well.
Background
According to geological survey specifications of geothermal resources (GB/T11615-. The traditional well washing operation steps need to complete well washing operation twice, a 89.9mm drill rod is put down for the first time to replace underground drilling fluid to the bottom of a well in a segmented mode, all drilling fluid in a shaft is replaced by clear water and then the shaft is drilled, and a radial ejector is put down for the second time to perform jet injection well washing on the inner wall of a water filter pipe from bottom to top. Therefore, the drilling can be completed by tripping the drill twice, and the time and the labor are consumed. If just going into radial ejector while replacing drilling fluid and carrying out the efflux to the strainer inner wall for the first time and spouting, because what the injection was the clear water replacement is the high drilling fluid of density, the pump pressure is originally just high, and the pressure drop of radial ejector nozzle in addition, the unable construction that construction pressure will be high, if increase radial ejector nozzle, satisfy the pump pressure needs, just lost the purpose of radial efflux well-flushing.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a geothermal well one-trip drilling high-pressure well washer and a well washing method.
In order to realize the purpose, the invention provides a geothermal well one-trip drilling high-pressure well washer, which adopts the following technical scheme:
a hot-well one-trip bores high pressure well washer, be greater than 139.7mmAPI sleeve pipe including a hollow external diameter, the sleeve pipe body is provided with a plurality of jet orifices, sheathed tube one end is connected with oil pipe joint, oil pipe articulate oil pipe, it is intraductal that the cover is located to the oil pipe cover, sheathed tube other end pipe diameter reduces and is the shape of falling the trapezoid, inside is provided with the bowling, the bowling is supporting with sheathed tube shape of falling the trapezoid pipe diameter, can realize sealed effect, forms the radial ejector of taking the bowling, the outside of the sleeve pipe other end is provided with the guide shoe.
Preferably, the pitching ball is a sphere with the diameter of 30 mm.
Preferably, the hole diameter of the injection hole is 10 mm.
Preferably, the oil pipe joint is an 88.9mm pipe diameter oil pipe joint.
Further preferably, the outer diameter of the oil pipe is 88.9mm, the inner diameter of the oil pipe is 76mm, the wall thickness of the sleeve is 6.45mm, the outer diameter of the sleeve is 177.8mm, the annular cross-sectional area of the sleeve and the oil pipe is 0.00167m2, the aperture of the injection hole is 10mm, the distance between the injection holes is 18mm, and quincunx distribution control is performed.
The invention also provides a well washing method of the geothermal well one-trip drilling high-pressure well washer, which comprises the following steps:
1) the geothermal well one-trip drilling high-pressure well washer is put into the geothermal well, underground drilling fluid is replaced to the bottom of the well in sections through a 88.9mm drilling tool with a ball-throwing radial ejector, and no ball is thrown during drilling;
2) carrying out discharge circulation of 32L/s to clean the settled sand and mud cakes in the shaft until all drilling fluid in the shaft is replaced by clear water; 3) the lower end of the radial ejector is sealed by the throwing ball, and the radial nozzle pressure is increased to start the radial jet well washing operation.
The application also provides a judging model for judging whether the well wall is suitable for the geothermal well one-trip drilling high-pressure well washer for high-pressure well washing.
Based on the molar coulomb strength criterion and taking into account the lithology and permeability of the surrounding rock of the borehole, a computational model of the collapse pressures of the different lithology and permeability formations around the borehole wall can be obtained as follows.
1) Sandstone thermal reservoir permeability sandstone layer (delta 1,
Ppg>1.0MPa/100m)
2) Mudstone and tight sandstone formations (delta 0,
Ppg>1.0MPa/100m)
3) Shale and tight rock formations (delta 0,
Ppg≤1.0MPa/100m)
Wherein
In the formula, delta represents the permeability coefficient of the pore-type sandstone, the mudstone is 0, and the permeability sandstone layer of the thermal reservoir is 1;
representing rock porosity; ppg denotes the pore pressure gradient, MPa/100 m; BP represents the collapse pressure, MPa; eta represents a stress nonlinear correction coefficient, generally takes 0.95 and is dimensionless; σ H and σ H respectively represent maximum and minimum horizontal principal stress, MPa; c represents rock cohesion, MPa; k represents an intermediate variable for calculating the internal friction force of the rock and is dimensionless; pp represents pore pressure, MPa; α represents an effective stress coefficient; xi represents a relation coefficient containing an effect coefficient and a Poisson ratio; phi denotes the rock internal friction angle, (°); mu represents the Poisson's ratio of the rock and is dimensionless. However, for jet flushing, the pressure of the fluid column in the wellbore is equal to the formation equilibrium pressure and the confining pressure. The stability of the borehole wall during high pressure injection is mainly dependent on the change of the cohesion of the formation rock. If the collapse pressure is approximately zero, i.e. BP is 0, then equations (1), (2) and (3) can be deformed to derive the C value, which is the sandstone cohesion used to balance the formation stress, and is essentially the critical value (C') of the sandstone cohesion. The C' calculation model for determining the stability of the high-pressure jet well-flushing well wall is as follows.
1) Sandstone thermal reservoir and permeable sandstone layer (delta 1,
Ppg＞1.0MPa/100m)：
2) Mudstone and tight sandstone formations (delta 0,
Ppg＞1.0MPa/100m)：
Therefore, the judgment criterion of the stability of the well wall when the rock around the well hole is subjected to shear failure can be given as follows: when C is more than C', the well wall is stable and is suitable for high-pressure well washing; when C is less than C', the borehole wall is unstable, which is not beneficial to high-pressure well washing, and the collapse of the new series stratum with poor incompetence of unconsolidated rocks can be caused.
The method for calculating the main parameters in the calculation model of the collapse pressures of different lithological and permeable strata around the well wall comprises the following steps:
(1) formation pore pressure
The method is obtained by an improved variable index Eton method, and the calculation formula is as follows:
(2) poisson ratio of rock
In the formula,. DELTA.tc 2And represents the rock transverse wave time difference, mu s/ft.
When the transverse wave time difference curve is not measured in a certain well section, GR and delta t can be usedcThe constructed transverse wave time difference formula is used for calculating a continuous delta tsThe curves, namely:
Δts＝0.004GR+1.433Δtc+22.906 (8)
where GR represents the rock natural gamma log, API.
(3) Cohesion of rock
Where ρ represents the rock density, g/cm3，vcRepresents the rock longitudinal wave velocity (reciprocal of time difference), ft/mus; vclRepresenting the mud content without dimension.
(4) Effective stress coefficient
In the formula Cr、CbRespectively representing the volume compression coefficient and the rock volume compression coefficient of the rock framework without dimension; rhosRepresenting the density, v, of the rock skeletonmc、vmsThe branch table shows the longitudinal wave and transverse wave velocities (reciprocal of time difference) of the rock skeleton, ft/mus.
In addition, the application also provides a calculation method for the external pressure intensity crushing criterion of the API standard oil pipe of the geothermal well one-trip drilling high-pressure well washer.
When the API standard oil pipe material is crushed under the condition of pure external pressure, sudden failure occurs when the external pressure reaches a limit value, which is because the appearance of the API standard oil pipe in the actual engineering is not an ideal pure circle, so that the circumferential stress of the non-circular API standard oil pipe in the circumferential direction is not unevenly distributed, namely an additional bending moment effect exists, and when the external pressure is continuously increased, the API standard oil pipe is up to yield at the position of the maximum compressive circumferential stress; when the yield reaches the limit value, the API standard oil pipe fails due to insufficient strength bearing capacity, so that strength or instability crushing is caused, and a strength crushing criterion under the action of external pressure is established. The criterion calculation method does not distinguish between elastic crushing or plastic crushing, i.e.:
F＝E+σ0-μσa (17)
H＝CB-3RDBe0+t(μσa-E) (R-t/2)B (18)
K＝3AR+CR-3RDe0R+3RDB+t(μσa-E)(R-t/2)R-3RBt(μσa-E)
(19)
wherein P represents the crushing strength, MPa; e0 denotes the initial ovality of the cannula; r represents the central circle radius of the section of the sleeve in mm; re represents the average radius of the sleeve after deformation, mm; e represents the modulus of elasticity, Nmm, of the material; ρ represents the central axis radius of curvature, mm; t represents the casing wall thickness, mm; μ represents a poisson's ratio; σ 0 represents the circumferential pressure, MPa; σ a represents the axial pressure, MPa; e. a, B, C, D, F, H, K respectively indicate calculation process intermediate parameters.
The working principle of the one-trip high-pressure well washer of the invention is as follows: when the ball-throwing type radial jet device drills down, no ball is thrown, the construction pressure is reduced by the guide shoe main nozzle, all drilling fluid in a shaft is replaced by clear water and then the ball is thrown, and the guide shoe main nozzle is closed after the ball is thrown, so that the pressure in a drilling tool rises, the discharge capacity of the radial jet nozzle and the pressure rise to achieve the purpose of jet well washing.
Compared with the prior art, the ball throwing type high-pressure jet device can completely meet the aims of replacing the drilling fluid at low pressure and jetting radial jet to wash the well at high pressure by one-time drilling, and achieves the purpose of completing the operations of replacing the drilling fluid and jetting and washing the inner wall of the water filter pipe by the high-pressure jet device by one-time drilling; the well washing technology can play a role in efficient well washing, saves cost and reduces underground risks, and saves 20 ten thousand yuan for a single well at least through calculation of the cost of well drilling and completion.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic diagram of a one-trip high-pressure well washer;
FIG. 2 is a schematic cross-sectional view of a cannula;
FIG. 3 is a simulation diagram of stresses at different depths of an oil pipe;
FIG. 4 is a 10mm triaxial stress test chart of a high-pressure injection hole;
FIG. 5 is a 10mm high pressure injection hole triaxial stress test plot (simulated strength was calculated using two triaxial equivalent plastic strains);
reference numbers in fig. 1: 1-casing pipe, 2-oil pipe joint, 3-ball throwing, 4-jet hole, 5-guide shoe.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
Example 1
As shown in fig. 1, geothermal well one-trip drilling high-pressure well washer, including a hollow external diameter be greater than 139.7mmAPI sleeve pipe 1, sleeve pipe 1 body is provided with a plurality of jet orifices 4, the one end of sleeve pipe 1 is connected with oil pipe joint 2, oil pipe joint connection oil pipe, it is intraductal that the cover is located to the oil pipe cover, sheathed tube other end pipe diameter reduces and is the shape of falling the trapezoid, inside is provided with bowling 3, bowling and sheathed tube shape of falling the trapezoid pipe diameter are supporting, can realize sealed effect, form the radial jet ejector of the formula of throwing, the outside of the sleeve pipe other end is provided with guide shoe 5.
In this embodiment, the ball is a sphere with a diameter of 30mm, and the aperture of the injection hole is 10 mm. The oil pipe joint is an 88.9mm pipe diameter oil pipe joint, the oil pipe outer diameter is 88.9mm, the oil pipe inner diameter is 76mm, the casing wall thickness is 6.45mm, the casing outer diameter is 177.8mm, and the annular cross-sectional area of the casing and the oil pipe is 0.00167m2And the distance between the jet holes is 18mm, and quincuncial distribution and control are carried out.
A well washing method of a geothermal well one-trip drilling high-pressure well washer comprises the following steps:
1) the geothermal well is put into the high-pressure well washer for one trip, the underground drilling fluid is replaced to the bottom of the well in a segmented manner through an 88.9mm drilling tool (a standard API drilling tool can be purchased in the market) with a ball-throwing radial jet device, and no ball is thrown during the drilling;
2) carrying the settled sand and mud cakes in the shaft completely through large discharge circulation of 32L/s until the drilling fluid in the shaft is completely replaced by clear water;
3) the lower end of the radial ejector is sealed by the throwing ball, and the radial nozzle pressure is increased to start the radial jet well washing operation.
During operation, the geothermal well one-trip drilling high-pressure well washer is firstly put into the geothermal well one-trip drilling high-pressure well washer to carry out high-displacement slurry replacing well washing, after the slurry replacing well washing process is completed, ball throwing seat sealing is carried out to block the inner diameter position of the lower body, clean water is injected into an oil pipe by a slurry pump high-pressure pump to form circulation to carry out radial injection well washing, and then high-pressure one-trip drilling well washing is carried out.
Example 2
A model for judging whether the well wall is suitable for the high-pressure well washing device for one trip drilling of the geothermal well to carry out high-pressure well washing is provided.
Based on the molar coulomb strength criterion and taking into account the lithology and permeability of the surrounding rock of the borehole, a computational model of the collapse pressures of the different lithology and permeability formations around the borehole wall can be obtained as follows.
1) Sandstone thermal reservoir permeability sandstone layer (delta 1,
Ppg>1.0MPa/100m)
2) Mudstone and tight sandstone formations (delta 0,
Ppg>1.0MPa/100m)
3) Shale and tight rock formations (delta 0,
Ppg≤1.0MPa/100m)
Wherein
In the formula, delta represents the permeability coefficient of the pore-type sandstone, the mudstone is 0, and the permeability sandstone layer of the thermal reservoir is 1;
representing rock porosity; ppg denotes the pore pressure gradient, MPa/100 m; BP represents the collapse pressure, MPa; eta represents a stress nonlinear correction coefficient, generally takes 0.95 and is dimensionless; σ H and σ H respectively represent maximum and minimum horizontal principal stress, MPa; c represents rock cohesion, MPa; k represents an intermediate variable for calculating the internal friction force of the rock and is dimensionless; pp represents pore pressure, MPa;α represents an effective stress coefficient; xi represents a relation coefficient containing an effect coefficient and a Poisson ratio; phi denotes the rock internal friction angle, (°); mu represents the Poisson's ratio of the rock and is dimensionless. However, for jet flushing, the pressure of the fluid column in the wellbore is equal to the formation equilibrium pressure and the confining pressure. The stability of the borehole wall during high pressure injection is mainly dependent on the change of the cohesion of the formation rock. If the collapse pressure is approximately zero, i.e. BP is 0, then equations (1), (2) and (3) can be deformed to derive the C value, which is the sandstone cohesion used to balance the formation stress, and is essentially the critical value (C') of the sandstone cohesion. The C' calculation model for determining the stability of the high-pressure jet well-flushing well wall is as follows.
1) Sandstone thermal reservoir and permeable sandstone layer (delta 1,
Ppg＞1.0MPa/100m)：
2) Mudstone and tight sandstone formations (delta 0,
Ppg＞1.0MPa/100m)：
Therefore, the judgment criterion of the stability of the well wall when the rock around the well hole is subjected to shear failure can be given as follows: when C is more than C', the well wall is stable and is suitable for high-pressure well washing; when C is less than C', the borehole wall is unstable, which is not beneficial to high-pressure well washing, and the collapse of the new series stratum with poor incompetence of unconsolidated rocks can be caused.
The method for calculating the main parameters in the calculation model of the collapse pressures of different lithological and permeable strata around the well wall comprises the following steps:
(1) formation pore pressure
The method is obtained by an improved variable index Eton method, and the calculation formula is as follows:
(2) poisson ratio of rock
In the formula,. DELTA.tc 2And represents the rock transverse wave time difference, mu s/ft.
When the transverse wave time difference curve is not measured in a certain well section, GR and delta t can be usedcThe constructed transverse wave time difference formula is used for calculating a continuous delta tsThe curves, namely:
Δts＝0.004GR+1.433Δtc+22.906 (8)
where GR represents the rock natural gamma log, API.
(3) Cohesion of rock
Where ρ represents the rock density, g/cm3，vcRepresents the rock longitudinal wave velocity (reciprocal of time difference), ft/mus; vclRepresenting the mud content without dimension.
(4) Effective stress coefficient
In the formula Cr、CbRespectively representing the volume compression coefficient and the rock volume compression coefficient of the rock framework without dimension; rhosRepresenting the density, v, of the rock skeletonmc、vmsThe branch table shows the longitudinal wave and transverse wave velocities (reciprocal of time difference) of the rock skeleton, ft/mus.
Example 3
A method for calculating the external pressure intensity crushing criterion of an API standard oil pipe of the geothermal well one-trip drilling high-pressure well washer.
When the API standard oil pipe material is crushed under the condition of pure external pressure, sudden failure occurs when the external pressure reaches a limit value, which is because the appearance of the API standard oil pipe in the actual engineering is not an ideal pure circle, so that the circumferential stress of the non-circular API standard oil pipe in the circumferential direction is not unevenly distributed, namely an additional bending moment effect exists, and when the external pressure is continuously increased, the API standard oil pipe is up to yield at the position of the maximum compressive circumferential stress; when the yield reaches the limit value, the API standard oil pipe fails due to insufficient strength bearing capacity, so that strength or instability crushing is caused, and a strength crushing criterion under the action of external pressure is established. The criterion calculation method does not distinguish between elastic crushing or plastic crushing, i.e.:
F＝E+σ0-μσa (17)
H＝CB-3RDBe0+t(μσa-E)(R-t/2)B (18)
K＝3AR+CR-3RDe0R+3RDB+t(μσa-E)(R-t/2)R-3RBt(μσa-E)
(19)
wherein P represents the crushing strength, MPa; e0 denotes the initial ovality of the cannula; r represents the central circle radius of the section of the sleeve in mm; re represents the average radius of the sleeve after deformation, mm; e represents the modulus of elasticity, Nmm, of the material; ρ represents the central axis radius of curvature, mm; t represents the casing wall thickness, mm; μ represents a poisson's ratio; σ 0 represents the circumferential pressure, MPa; σ a represents the axial pressure, MPa; e. a, B, C, D, F, H, K respectively indicate calculation process intermediate parameters.
The method comprises the steps of establishing a finite element three-dimensional entity API standard oil pipe model by using ANSYS Workbench finite element analysis software, in order to avoid the influence of end effect on simulation analysis results, enabling the length/outer diameter ratio of the established model to be larger than that of the established model, bringing real stress-strain into a material model, applying fixed constraint boundary conditions at two ends of the established API standard oil pipe model in order to be consistent with physical evaluation test conditions, applying external pressure on the outer surface of the calculation model, obtaining a critical load analysis model when a structural model is unstable by adopting finite elements to increase loads step by step based on a nonlinear buckling analysis theory, and analyzing the external extrusion resistance of a sleeve injection hole under the condition of non-uniform loads.
As shown in fig. 2, which is a schematic cross-sectional view of the casing, the bore diameter is designed according to 10mm, the points 1-14 in the drawing represent injection holes, the hole spacing is quincunx controlled according to 18mm, and the processing is performed according to different angles as shown in the following table:
comparing the data of the oil pipes with different sizes, the well-flushing tool carried out on the 177.8mm sieve tube outer diameter is more common and efficient, and the outer diameter of the oil pipe is 88.9 mm/wall thickness is 6.45mm, and the annular cross-sectional area is 0.00167m2The inner diameter is 76mm, and the diameter of the ball is 30 mm.
And (3) performing simulation calculation on the stress intensities at different depths to ensure the safety of the downhole tool, wherein a simulation diagram of the stress at different depths of the oil pipe is shown in FIG. 3.
As shown in fig. 4-5, the triaxial stress test was performed for a high-pressure injection hole having a hole diameter of 10mm without any destruction pressure; in all anti-collapse calculations, the pipe is assumed to be not affected by axial load, nominal values are adopted for the outer diameter and the wall thickness, the ovality of the outer diameter is set to be 0.1%, no residual stress exists, the wall thickness is uniform, the yield stress is the minimum nominal yield strength of 110ksi strength level, namely 758MPa, 207GPa is measured for the elastic modulus of an oil pipe material, 0.33 is taken for Poisson's ratio, 28 specifications of oil sleeves with typical outer diameters of 73.02-339.72 mm are selected from API TR 5C3 for calculation and comparative analysis, when the outer diameter of the oil pipe is 88.9mm, the inner diameter of the oil pipe is 76mm, the wall thickness of the sleeve is 6.45mm, the outer diameter of the sleeve is 177.8mm, the annular sectional area of the sleeve and the oil pipe is 0.00167m2, the aperture of an injection hole is 10mm, the hole spacing is 18 mm.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (8)
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6059032A (en) * | 1997-12-10 | 2000-05-09 | Mobil Oil Corporation | Method and apparatus for treating long formation intervals |
| CN104153744A (en) * | 2014-07-31 | 2014-11-19 | 山东省地矿工程勘察院 | Pore type geothermal well jet well-flushing device and method for jetting well-flushing by using same |
| CN208564507U (en) * | 2018-06-06 | 2019-03-01 | 湖北地大热能科技有限公司 | A kind of geothermal well well wall cleaning tool |
| CN110552663A (en) * | 2019-09-24 | 2019-12-10 | 中国石油集团渤海钻探工程有限公司 | Flexible rotary jet cleaning tool |
| CN111287693A (en) * | 2018-12-06 | 2020-06-16 | 中国石油天然气集团有限公司 | Well flushing tool with coiled tubing capable of realizing positive and negative circulation |
| CN111395994A (en) * | 2020-03-13 | 2020-07-10 | 中石化绿源地热能(陕西)开发有限公司 | High-pressure hydraulic jet radial jet well washing device |
-
2021
- 2021-01-06 CN CN202110014870.4A patent/CN112696173A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6059032A (en) * | 1997-12-10 | 2000-05-09 | Mobil Oil Corporation | Method and apparatus for treating long formation intervals |
| CN104153744A (en) * | 2014-07-31 | 2014-11-19 | 山东省地矿工程勘察院 | Pore type geothermal well jet well-flushing device and method for jetting well-flushing by using same |
| CN208564507U (en) * | 2018-06-06 | 2019-03-01 | 湖北地大热能科技有限公司 | A kind of geothermal well well wall cleaning tool |
| CN111287693A (en) * | 2018-12-06 | 2020-06-16 | 中国石油天然气集团有限公司 | Well flushing tool with coiled tubing capable of realizing positive and negative circulation |
| CN110552663A (en) * | 2019-09-24 | 2019-12-10 | 中国石油集团渤海钻探工程有限公司 | Flexible rotary jet cleaning tool |
| CN111395994A (en) * | 2020-03-13 | 2020-07-10 | 中石化绿源地热能(陕西)开发有限公司 | High-pressure hydraulic jet radial jet well washing device |
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