CN108952622B - Quick leaking stoppage and collapse prevention process for drilling in downhole of geothermal well - Google Patents
Quick leaking stoppage and collapse prevention process for drilling in downhole of geothermal well Download PDFInfo
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- CN108952622B CN108952622B CN201810745348.1A CN201810745348A CN108952622B CN 108952622 B CN108952622 B CN 108952622B CN 201810745348 A CN201810745348 A CN 201810745348A CN 108952622 B CN108952622 B CN 108952622B
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- 238000005553 drilling Methods 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 46
- 230000008569 process Effects 0.000 title claims abstract description 41
- 230000002265 prevention Effects 0.000 title claims description 8
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 63
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 63
- 239000007864 aqueous solution Substances 0.000 claims abstract description 42
- 238000005086 pumping Methods 0.000 claims abstract description 22
- 230000008719 thickening Effects 0.000 claims abstract description 13
- 239000012530 fluid Substances 0.000 claims abstract description 10
- 125000006850 spacer group Chemical group 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 238000004140 cleaning Methods 0.000 claims description 9
- VGTPCRGMBIAPIM-UHFFFAOYSA-M sodium thiocyanate Chemical compound [Na+].[S-]C#N VGTPCRGMBIAPIM-UHFFFAOYSA-M 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 238000006136 alcoholysis reaction Methods 0.000 claims description 4
- 239000000498 cooling water Substances 0.000 claims description 4
- 239000003381 stabilizer Substances 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 238000002955 isolation Methods 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 10
- 239000004568 cement Substances 0.000 description 12
- 239000011435 rock Substances 0.000 description 12
- 239000003795 chemical substances by application Substances 0.000 description 8
- 239000000243 solution Substances 0.000 description 8
- 239000012466 permeate Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/426—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells for plugging
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/44—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing organic binders only
-
- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
- E21B33/134—Bridging plugs
Landscapes
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The invention discloses a quick plugging and anti-collapse process for drilling a down-the-hole of a geothermal well, which comprises the following steps of; preparing a polyvinyl alcohol aqueous solution; lifting the drilling tool to the upper part of the leakage section, and sequentially pumping a lower rubber plug and spacer fluid into the drilling rod until the lower rubber plug is pressed against the down-the-hole hammer impacter; sequentially pumping the polyvinyl alcohol aqueous solution prepared in the step one and the upper rubber plug into a drill rod until the upper rubber plug is in collision pressure with a down-the-hole hammer impactor; and step three, thickening, condensing and thickening the polyvinyl alcohol aqueous solution injected into the step three to form a film, namely completing the plugging. In conclusion, the process disclosed by the invention is mainly applied to the downhole drilling construction of the geothermal well, can be used for rapidly plugging a broken stratum, greatly shortens the construction period, saves the cost and further improves the working efficiency.
Description
Technical Field
The invention relates to a rapid leaking stoppage and collapse prevention process, in particular to an effective process aiming at stratum leakage and collapse in the drilling construction process of a downhole of a geothermal well.
Background
The air down-the-hole hammer drilling process is reputed all over the world with high quality and high efficiency. The main equipment of the air down-the-hole hammer drilling process comprises a down-the-hole hammer and an air compressor, wherein the air compressor provides compressed air for the down-the-hole hammer. The large-diameter down-the-hole hammer is driven to work by taking compressed air as a power medium under the action of an air compressor, and high-frequency crushing impact is carried out on hard rock; in the drilling process of the pneumatic down-the-hole hammer, high-pressure air drives a piston in the impactor to do high-frequency reciprocating motion, and kinetic energy generated by the motion is continuously transmitted to a drill bit, so that the drill bit obtains certain impact energy. Under the action of the impact energy, the drill bit continuously impacts the hole bottom rock. Under the action of the impact energy, the rock is subjected to volume crushing. Meanwhile, compressed air generated by the air compressor is also used as a well washing medium to carry out the rock debris crushed by the down-the-hole hammer into the hole.
Namely, the underground hole drilling of the geothermal well mainly utilizes high-pressure airflow discharged by an impactor to cool a drill bit and carry rock debris to the surface in a positive circulation mode. But the method has the primary problems that high-speed fluid formed in the annular space of the well wall further damages the stability of the stratum of the well wall, so severe leakage or collapse and block falling happen, and even the accidents of drill sticking and burying happen seriously. The conventional treatment measures are that the drilling tool is lifted out of a wellhead, cement slurry is poured into the wellhead, after cement penetrates into cracks to solidify broken rocks, a down-the-hole hammer is used for drilling a cement plug, the next drilling process is continued, and even multiple times of cement sealing can be completed when a well section with serious breaking and collapse is encountered. The down-the-hole drilling has the characteristic of high-efficiency and quick construction, and the measure can achieve the effects of plugging and preventing collapse, but the whole working efficiency is reduced because a large amount of auxiliary treatment time is increased, including the drilling tool lifting and drilling, the cement consolidation waiting and setting period and the like.
The present invention has been made in view of the above problems.
Disclosure of Invention
The invention aims to provide a quick leaking stoppage and collapse prevention process for drilling a downhole of a geothermal well, which can be used for inputting a prepared collapse prevention agent into a hole through an air compressor air supply pipeline by a surface pumping device on the premise of not lifting the drill, and finally permeating rock cracks to form a film with stronger adhesive force to be adsorbed on a well wall according to the characteristics of solidification film forming in a shorter time and accelerated solidification along with temperature reduction and better adhesive force characteristic.
In order to achieve the purpose, the technical scheme of the invention is as follows: a kind of geothermal well down-hole bores and creeps into the fast leak stoppage and anti-collapse craft, including the following steps;
the method comprises the following steps: preparing a polyvinyl alcohol aqueous solution as a plugging and anti-collapse agent;
step two: lifting the drilling tool to the upper part of the leakage section, and sequentially pumping a lower rubber plug and spacer fluid into the drilling rod until the lower rubber plug is pressed against the down-the-hole hammer impacter;
step three: pumping the polyvinyl alcohol aqueous solution prepared in the step one and the upper rubber plug into a drill rod in sequence, wherein the pumping pressure is greater than the compressive strength of the lower rubber plug, and the lower rubber plug is damaged in the pumping process of the upper rubber plug so that the polyvinyl alcohol aqueous solution is injected into a leakage section until the upper rubber plug is in collision pressure with a down-the-hole hammer impactor, so that the injection is finished;
step four: and (4) thickening, condensing and thickening the polyvinyl alcohol aqueous solution injected in the third step to form a film, namely completing the plugging.
Further, in the first step, a polyvinyl alcohol material with an alcoholysis degree of 99% is selected and added into water to be heated so as to dissolve the polyvinyl alcohol material to prepare a polyvinyl alcohol aqueous solution, wherein the polyvinyl alcohol accounts for 8% -10% by mass.
Further, after the preparation of the polyvinyl alcohol aqueous solution is finished, the temperature of the prepared polyvinyl alcohol aqueous solution is controlled to be 90-95 ℃ by a temperature control device.
Further, a sodium thiocyanate stabilizer is also added into the polyvinyl alcohol aqueous solution prepared in the step one.
Furthermore, the mass percent of the sodium thiocyanate in the polyvinyl alcohol aqueous solution in the step one is 0.3-0.5%.
And further, after the drilling tool is lifted to the upper part of the leakage section, cooling water is pumped into the drilling rod to pretreat the well, and then the lower rubber plug and the spacer fluid are sequentially pumped into the drilling rod.
Further, in the first step, the drilling tool is lifted to the position 3-5 meters away from the loss section; in the second step, the compressive strength of the lower rubber plug is 3-5 MPA; the compressive strength of the rubber plug in the third step is 6-8 MPA.
Further, in the fourth step, after the upper rubber plug is pressed against the down-the-hole hammer impactor, the drilling tool is lifted to the upper part of the loss section by 10-15m, then cleaning water is pumped into the drill pipe, and the pumping pressure is 9-10 MPA.
Further, the pressure in the drill rod in the processes of the first step to the fourth step meets the following conditions: pa is more than Pb and less than Pc, wherein Pa is the compressive strength of the lower rubber plug; pb is the compressive strength of the rubber plug; pc is the pump-in cleaning water pressure.
Furthermore, the thickening film-forming time in the fourth step is 2h-3 h.
The invention has the beneficial effects that:
the process is mainly applied to the downhole drilling construction of the geothermal well, when the well section cracks or collapses in the drilling process, only the drilling tool needs to be lifted to the upper part of the leakage section, then the anti-collapse and leak-stopping process is implemented, the polyvinyl alcohol solution is used as an anti-collapse agent, and can be kept dry at high temperature after film forming, so that the process is suitable for the environment of the geothermal well, the broken stratum can be well plugged, and the drilling operation can be continued after plugging; the conventional plugging measures are that the drilling tool is lifted out of a well mouth, cement slurry is poured into a well section, after cement permeates into cracks to solidify broken rocks, a down-the-hole hammer is used for drilling a cement plug, the next drilling process is continued, and the well section with serious breakage and collapse can be completed even after multiple times of cement sealing. Compared with the traditional plugging process, the plugging process greatly shortens the construction period, saves the cost and further improves the working efficiency.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below.
Example 1:
a kind of geothermal well down-the-hole creeps into the fast leaking stoppage and prevents the technology of collapsing, when in the course of drilling, when the stratum cracks or collapses the phenomenon, the method used for leaking stoppage, including the following steps;
the method comprises the following steps: preparing a polyvinyl alcohol aqueous solution as an anti-collapse agent. After the polyvinyl alcohol aqueous solution is dried, a strong and tough anti-tearing film can be formed, and the wear resistance of the film is also good. The mechanical property of the polyvinyl alcohol film can be adjusted by the dosage of the plasticizer, the water content, different grades of polyvinyl alcohol and the like. All grades of polyvinyl alcohol are hygroscopic and films of polyvinyl alcohol remain non-tacky and dry even at high temperatures. The temperature of the geothermal well section is higher, and the polyvinyl alcohol aqueous solution as the anti-collapse agent can be well adapted to the underground environment. The polyvinyl alcohol aqueous solution is solidified into a film in a short time, and is solidified with acceleration along with the temperature reduction, and the polyvinyl alcohol aqueous solution has better cohesive force characteristic, finally permeates into rock cracks to form a film with stronger adhesive force, and is adsorbed on a well wall, so that the effects of quickly plugging and preventing collapse are achieved.
Step two: and lifting the drilling tool to the upper part of the leakage section, and pumping a lower rubber plug and spacer fluid into the drilling rod in sequence until the lower rubber plug is pressed against the down-the-hole hammer impacter. In the step, the lower rubber plug and the isolation liquid are pumped in through an air supply pipeline of the air compressor, and the lower rubber plug has the characteristics of unidirectionality and smaller pressure resistance.
Step three: and (2) sequentially pumping the polyvinyl alcohol aqueous solution prepared in the step one and the upper rubber plug into a drill pipe, pumping the polyvinyl alcohol aqueous solution and the upper rubber plug into an air compressor air supply pipeline through an external linkage pump and a three-way device during pumping, simultaneously opening an air supply valve of the air compressor, pumping the formed air-water mixed solution into a well, wherein the pumping pressure is higher than the compressive strength of the lower rubber plug, and the lower rubber plug is damaged in the pumping process of the upper rubber plug so that the polyvinyl alcohol aqueous solution is injected into a leakage section until the upper rubber plug is pressed against a down-the-hole hammer impactor, so that the polyvinyl alcohol. The upper rubber plug has the characteristics of unidirectionality and pressure resistance which are larger than those of the lower rubber plug. And calculating the air supply amount according to the drill rod and the inner annular space of the outer pipeline.
Step four: and (4) thickening, condensing and thickening the polyvinyl alcohol aqueous solution injected in the third step to form a film, namely completing the plugging. After the anti-collapse agent is injected into the leakage section, the anti-collapse agent permeates into the cracks and has strong affinity with rock stratums, and after the polyvinyl alcohol aqueous solution is dried, a strong and tough anti-tear film can be formed, and the wear resistance of the film is also good. Therefore, the broken rock stratum can be well plugged. The film of the polyvinyl alcohol water solution is formed, and the plugging operation is finished.
The first step and the second step in the above embodiments may be in a sequence as required.
In the technical scheme, in the first step, a polyvinyl alcohol material with an alcoholysis degree of 99% is selected and added into water to be heated so as to dissolve the polyvinyl alcohol material to prepare a polyvinyl alcohol aqueous solution, wherein the mass percentage of the polyvinyl alcohol is 8% -10%. The mass percent of polyvinyl alcohol in the polyvinyl alcohol aqueous solution is determined according to the severity of the leakage, and the more severe the concentration is.
In the technical scheme, after the preparation of the polyvinyl alcohol aqueous solution is finished, the temperature of the prepared polyvinyl alcohol aqueous solution is controlled to be 90-95 ℃ by a temperature control device. The polyvinyl alcohol water solution with 99 percent of alcoholysis degree can keep the fluid state only when the temperature is over 90 ℃, so the fluid state is kept by keeping the temperature at 90-95 ℃ before being pumped into a drill rod.
In the technical scheme, a sodium thiocyanate stabilizer is also added into the polyvinyl alcohol aqueous solution prepared in the step one. In order to increase the viscosity stability of the polyvinyl alcohol aqueous solution under the high temperature condition, a sodium thiocyanate stabilizer is added into the polyvinyl alcohol aqueous solution prepared in the step one to keep the viscosity stability of the polyvinyl alcohol aqueous solution.
In the technical scheme, the mass percent of the sodium thiocyanate in the polyvinyl alcohol aqueous solution in the step one is 0.3-0.5%.
Example 2:
in each technical scheme of embodiment 1, preferably, in the second step, after the drilling tool is lifted to the upper part of the leaking section, cooling water is pumped into the drilling rod to pretreat the well, and then the lower rubber plug and the spacer fluid are sequentially pumped into the drilling rod. The cooling water can be pumped into the drill pipe through the air inlet pipe of the air compressor, on one hand, the inner wall of the drill pipe and the impactor can be washed clean, on the other hand, the temperature of a target stratum can be reduced, and the quick film forming of the polyvinyl alcohol water solution is facilitated.
Example 3:
in each technical scheme of the embodiment 1 and the embodiment 2, the drilling tool in the step one is lifted to a position 3-5 meters away from the loss section;
selecting a lower rubber plug with the compressive strength of 3-5MPA in the second step;
in the third step, an upper rubber plug with the compressive strength of 6-8MPA is selected.
Example 4:
in each technical scheme of the embodiment 1, the embodiment 2 and the embodiment 3, after the upper rubber plug and the down-the-hole hammer impactor are pressed in the fourth step, the drilling tool is lifted to the upper part of the leakage section by 10-15m, then the cleaning water is pumped into the drill pipe, and the pumping pressure is 9-10 MPA. The air compressor air inlet pipe can be used for pumping cleaning water, the cleaning water can be used for cleaning the polyvinyl alcohol solution remained on the inner wall of the drill rod, and meanwhile, the bottom hole temperature is reduced, so that the pumped polyvinyl alcohol aqueous solution is accelerated to form a film, and the working efficiency is improved.
In the technical scheme, the pressure in the drill rod in the processes of the first step to the fourth step meets the following requirements: pa is more than Pb and less than Pc, wherein Pa is the compressive strength of the lower rubber plug; pb is the compressive strength of the rubber plug; pc is the pump-in cleaning water pressure.
In the technical scheme, the thickening film-forming time in the fourth step is 2-3 h. The whole plugging construction operation can be completed within the thickening time of the polyvinyl alcohol aqueous solution, and a certain safety coefficient is included. The construction time is generally +1 hour < the thickening time.
And after the geothermal well plugging work is finished, the drill bit penetrates through the leakage stratum section to continuously drill into the subsequent stratum.
In conclusion, the process is mainly applied to the downhole drilling construction of the geothermal well, when the well section cracks or collapses in the drilling process, the drilling tool is only required to be lifted to the upper part of the lost circulation section, then the anti-collapse and leak-stopping process is implemented, the polyvinyl alcohol solution is used as an anti-collapse agent, the drying can be kept at high temperature after the film is formed, the anti-collapse and leak-stopping process is suitable for the environment of the well section, the broken stratum can be well plugged, and the drilling operation can be continued after the plugging; the conventional plugging measures are that the drilling tool is firstly lifted out, cement slurry is poured into a well section, after cement permeates into cracks to solidify broken rocks, a down-the-hole hammer is used for drilling a drilled hole, the next drilling process is continued, and when the well section with serious breakage and collapse is encountered, multiple times of cement sealing are needed to complete the plugging. Compared with the traditional plugging process, the plugging process greatly shortens the construction period, saves the cost and further improves the working efficiency.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and not restrictive, and various changes and modifications may be made in the technical solutions of the present invention by those skilled in the art without departing from the spirit of the present invention, which is defined in the claims.
Claims (9)
1. A quick leak stoppage and collapse prevention process for drilling a down-the-hole in a geothermal well is characterized by comprising the following steps;
the method comprises the following steps: preparing a polyvinyl alcohol aqueous solution;
step two: lifting the drilling tool to the upper part of the leakage section, and sequentially pumping a lower rubber plug and spacer fluid into the drilling rod until the lower rubber plug is pressed against the down-the-hole hammer impacter;
step three: pumping the polyvinyl alcohol aqueous solution prepared in the step one and the upper rubber plug into a drill rod in sequence, wherein the pumping pressure is greater than the compressive strength of the lower rubber plug, and the lower rubber plug is damaged in the pumping process of the upper rubber plug so that the polyvinyl alcohol aqueous solution is injected into a leakage section until the upper rubber plug is in collision pressure with a down-the-hole hammer impactor, so that the injection is finished;
step four: thickening, condensing and thickening the polyvinyl alcohol aqueous solution injected in the third step to form a film, namely completing the plugging;
in the first step, a polyvinyl alcohol material with alcoholysis degree of 99% is selected and added into water to be heated so as to dissolve the polyvinyl alcohol material to prepare a polyvinyl alcohol aqueous solution, and the mass percent of the polyvinyl alcohol is 8% -10%.
2. The process for rapidly plugging and preventing collapse of the borehole drilling of the geothermal well according to claim 1, wherein the temperature of the prepared polyvinyl alcohol aqueous solution is controlled to be 90-95 ℃ by a temperature control device after the preparation of the polyvinyl alcohol aqueous solution is completed.
3. The process for quickly plugging and preventing the collapse of the downhole drilling of the geothermal well as defined in claim 2, wherein a sodium thiocyanate stabilizer is further added into the polyvinyl alcohol aqueous solution prepared in the step one.
4. The rapid leaking stoppage and collapse prevention process for the drilling of the downhole of the geothermal well as defined in claim 3, wherein the mass percentage of the sodium thiocyanate in the polyvinyl alcohol aqueous solution in the step one is 0.3-0.5%.
5. The process for quickly plugging and preventing the collapse of the downhole drilling of the geothermal well according to any one of claims 1 to 4, wherein in the second step, after the drilling tool is lifted to the upper part of the leaking section, cooling water is pumped into the drill rod to pretreat the downhole, and then a lower rubber plug and an isolation fluid are sequentially pumped into the drill rod.
6. The rapid leaking stoppage and anti-collapse process for the drilling of the downhole of the geothermal well as defined in any one of claims 1 to 4, wherein in the first step, the drilling tool is lifted to a position 3 to 5 meters away from the leaking section; in the second step, the compressive strength of the lower rubber plug is 3-5 MPA; the compressive strength of the rubber plug in the third step is 6-8 MPA.
7. The process for quickly plugging and preventing the collapse of the downhole drilling of the geothermal well according to any one of claims 1 to 4, wherein in the fourth step, after the upper rubber plug is impacted with the down-the-hole hammer impactor, the drilling tool is lifted to the upper part of the lost circulation section by 10 to 15m, and then cleaning water is pumped into the drill pipe, wherein the pumping pressure is 9 to 10 MPA.
8. The rapid leak stoppage and collapse prevention process for the drilling of the downhole of the geothermal well as defined in claim 7 is characterized in that the pressure in the drill rod in the processes of the first step to the fourth step meets the following requirements: pa is more than Pb and less than Pc, wherein Pa is the compressive strength of the lower rubber plug; pb is the compressive strength of the rubber plug; pc is the pump-in cleaning water pressure.
9. The process for quickly plugging and preventing the collapse of the drilling well downhole of the geothermal well according to claim 8, wherein the thickening and film forming time in the fourth step is 2 to 3 hours.
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| CN201810745348.1A CN108952622B (en) | 2018-07-09 | 2018-07-09 | Quick leaking stoppage and collapse prevention process for drilling in downhole of geothermal well |
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| CN110028927A (en) * | 2019-03-13 | 2019-07-19 | 河南诚信密封材料有限公司 | A kind of fireproof gum of high fire-retardance and preparation method thereof |
| CN110157397A (en) * | 2019-05-23 | 2019-08-23 | 新疆格瑞迪斯石油技术股份有限公司 | A kind of drilling fluid nanometer film forming sealing agent and its preparation method and application |
| CN110205106B (en) * | 2019-05-27 | 2021-03-26 | 吉林省安和石油技术服务有限公司 | Plugging and isolating agent for low-pressure natural gas well of oil field and preparation method of plugging and isolating agent |
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