CN108952622A - A kind of geothermal well down-the-hole drilling anti-collapse technique of fast blockage - Google Patents
A kind of geothermal well down-the-hole drilling anti-collapse technique of fast blockage Download PDFInfo
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- CN108952622A CN108952622A CN201810745348.1A CN201810745348A CN108952622A CN 108952622 A CN108952622 A CN 108952622A CN 201810745348 A CN201810745348 A CN 201810745348A CN 108952622 A CN108952622 A CN 108952622A
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- polyvinyl alcohol
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- 238000005553 drilling Methods 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 53
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 52
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 52
- 239000004568 cement Substances 0.000 claims abstract description 32
- 208000034656 Contusions Diseases 0.000 claims abstract description 11
- 230000008719 thickening Effects 0.000 claims abstract description 10
- 239000007788 liquid Substances 0.000 claims abstract description 9
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 8
- 238000009833 condensation Methods 0.000 claims abstract description 4
- 230000005494 condensation Effects 0.000 claims abstract description 4
- 229940068984 polyvinyl alcohol Drugs 0.000 claims description 49
- 235000019422 polyvinyl alcohol Nutrition 0.000 claims description 49
- 239000000243 solution Substances 0.000 claims description 46
- 230000006835 compression Effects 0.000 claims description 15
- 238000007906 compression Methods 0.000 claims description 15
- 238000002360 preparation method Methods 0.000 claims description 7
- 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
- 229920002689 polyvinyl acetate Polymers 0.000 claims description 6
- 239000011118 polyvinyl acetate Substances 0.000 claims description 6
- 238000006136 alcoholysis reaction Methods 0.000 claims description 4
- 239000000498 cooling water Substances 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 239000003381 stabilizer Substances 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000004090 dissolution Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 239000007864 aqueous solution Substances 0.000 claims description 2
- 238000007781 pre-processing Methods 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 10
- 239000011435 rock Substances 0.000 description 10
- 239000003795 chemical substances by application Substances 0.000 description 7
- 241001074085 Scophthalmus aquosus Species 0.000 description 5
- 238000001035 drying Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 239000003292 glue Substances 0.000 description 3
- 230000008595 infiltration Effects 0.000 description 3
- 238000001764 infiltration Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000007596 consolidation process Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- IMROMDMJAWUWLK-UHFFFAOYSA-N Ethenol Chemical compound OC=C IMROMDMJAWUWLK-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000011533 pre-incubation Methods 0.000 description 1
- 238000012163 sequencing technique Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000002351 wastewater Substances 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)
- Engineering & Computer Science (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Chemical & Material Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Geochemistry & Mineralogy (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a kind of geothermal well down-the-holes to creep into the anti-collapse technique of fast blockage, includes the following steps；Prepare polyvinyl alcohol water solution；Drilling tool is above mentioned to leakage section top, bottom plug, insulating liquid are successively pumped into drilling rod, until bottom plug and the bruising of down-hole hammer impactor；Polyvinyl alcohol water solution and top cement plug that step 1 is prepared successively are pumped into drilling rod until the top cement plug and the bruising of down-hole hammer impactor；The polyvinyl alcohol water solution thickening condensation thickening film forming injected in step 3, i.e. leak stopping are completed.In conclusion technique of the invention is mainly used in geothermal well down-the-hole drilling construction, quickly broken formation can be blocked, substantially reduce construction period and save the cost, and then improve working efficiency.
Description
Technical field
The present invention relates to be directed to stratum in a kind of anti-collapse technique of fast blockage, especially geothermal well down-the-hole drilling work progress
Leakage and a kind of effective technique collapsed.
Background technique
Air down-hole hammer drilling process, it is high-quality with its, efficiently enjoy great prestige the whole world.Air down-hole hammer drilling process is mainly set
Standby includes down-hole hammer and air compressor, and wherein air compressor provides compressed air for down-hole hammer.Major diameter downhole hammer is in sky
Under the action of air compressor, its work is driven by dynamic medium of compressed air, the broken impact of high-frequency is carried out to hard rock；In gas
During dynamic DTH drilling, the piston in high pressure air drives impactor makees high-frequency reciprocating movement, and will be produced by the movement
Kinetic energy be endlessly transmitted on drill bit, so that drill bit is obtained certain ballistic work.Drill bit is under the action of the ballistic work, even
Continuous device to hole bed rock stone implements impact.Rock forms volumetric fracture under the action of the ballistic work.Meanwhile air compressor machine generation
Compressed air also doubles as well-flushing medium, and the landwaste that down-hole hammer is crushed is carried outside in hole.
The high pressure draught that i.e. geothermal well down-the-hole drilling mainly be discharged using impactor cooled down in the way of direct circulation drill bit with
Cutting carring is to earth's surface.But its matter of utmost importance faced is the high-velocity fluid formed in borehole wall annular space, to the steady of borehole wall stratum
It is qualitative to cause further destruction, lead to occur acutely leakage or collapsing and breaking, serious or even generation bit freezing and underground drilling accident.
Conventional treatment measures are that drilling tool is proposed well head, pour into cement slurry, after cement infiltration crack consolidates fractured rock, then are used
Down-hole hammer opens cement plug brill, continues drilling process in next step, encounters broken serious well section of collapsing, or even need multiple cement
Sealing could be completed.Down-the-hole drilling itself has the characteristics that efficient rapid construction, though such measure also can achieve leak stopping and prevent
The effect collapsed, but because increase a large amount of ancillary processing time, including drilling tool puts brill, cement consolidation Hou Ning phase etc., so
Reduce whole work efficiency.
In view of the above-mentioned problems, proposing the present invention.
Summary of the invention
The object of the present invention is to provide a kind of geothermal well down-the-holes to creep into the anti-collapse technique of fast blockage, this technique can not mention
Under the premise of brill, being pumped into device by earth's surface will pass through in air compressor air supply pipeline input hole with the anti-sloughing agent got ready, foundation
It has the characteristics that consolidation forms a film within a short period of time, reduces acceleration solidification with temperature, and has preferably bonding force characteristic,
It eventually penetrates rock fracture and forms the stronger film of adhesion strength, be adsorbed on the borehole wall, achieve the effect that fast blockage is anti-collapse.
For achieving the above object, the technical scheme is that a kind of geothermal well down-the-hole drilling fast blockage is anti-collapse
Technique includes the following steps；
Step 1: polyvinyl alcohol water solution is prepared, as leak stopping anti-sloughing agent；
Step 2: drilling tool is above mentioned to leakage section top, bottom plug, insulating liquid is successively pumped into drilling rod, until lower glue
Plug and the bruising of down-hole hammer impactor；
Step 3: polyvinyl alcohol water solution and top cement plug that the step 1 is prepared successively are pumped into drilling rod, pump-in pressure
Greater than the compression strength of bottom plug, bottom plug is destroyed during top cement plug is pumped into makes polyvinyl alcohol water solution be injected into leakage
Section, until the top cement plug and the bruising of down-hole hammer impactor, injection is completed；
Step 4: the polyvinyl alcohol water solution thickening condensation thickening film forming injected in the step 3, i.e. leak stopping are completed.
Further, step 1, the polyvinyl acetate material that alcoholysis degree is 99% heating that is added to the water is chosen when preparation to be made
Polyvinyl acetate material dissolution is configured to polyvinyl alcohol water solution, and the mass percent of polyvinyl alcohol is 8%-10%.
Further, pass through temperature regulating device after the completion of polyvinyl alcohol water solution is prepared for prepared polyvinyl alcohol water solution
Temperature is controlled at 90 DEG C -95 DEG C.
Further, sodium sulfocyanate stabilizer is additionally added in the polyvinyl alcohol water solution of step 1 preparation.
Further, the mass percent of sodium sulfocyanate is 0.3%-0.5% in step 1 polyvinyl alcohol water solution.
Further, step 2 drilling tool is above mentioned to leakage section top after, first be pumped into drilling rod cooling water in well into
After row pretreatment, then bottom plug, insulating liquid are successively pumped into drilling rod.
Further, drilling tool is above mentioned to section 3-5 meters of leakage in step 1；Bottom plug compression strength is in the step 2
3-5MPA；Top cement plug compression strength is 6-8MPA in step 3.
Further, in step 4, after the top cement plug and the bruising of down-hole hammer impactor, drilling tool is above mentioned to leakage section
It is pumped into ejected wash water, pump-in pressure 9-10MPA after portion 10-15m into drilling rod again.
Further, inner pressure inside pipe meets during step 1 to step 4: Pa < Pb < Pc, and Pa is bottom plug in formula
Compression strength；Pb is top cement plug compression strength；Pc is to be pumped into cleaning water pressure.
Further, it is 2h-3h that film formation time is thickened in step 4.
The beneficial effects of the present invention are:
Technique of the invention is mainly used in geothermal well down-the-hole drilling construction, when crack occurs for well section in drilling process
Or when collapsing phenomenon, it is only necessary to by drilling tool lifting to leakage section top, then implement above-mentioned anti-collapse leak-stopping technique, polyvinyl alcohol
Solution is also able to maintain drying as anti-sloughing agent under high temperature after film forming, adapt to geothermal well environment, can be very good by broken formation into
Row blocks, and can continue drilling operation after closure；Conventional close measure is that drilling tool is first proposed well head, and water is poured into well section
Cement plug brill is opened after cement infiltration crack consolidates fractured rock, then with down-hole hammer, continues drilling work in next step by mud
Sequence encounters broken serious well section of collapsing, or even needs multiple cement sealing that could complete.Leak-stopping technique and tradition of the invention
Leak-stopping technique compared to substantially reducing construction period and save the cost, and then improve work efficiency.
Specific embodiment
The technical scheme in the embodiments of the invention will be clearly and completely described below.
Embodiment 1:
A kind of geothermal well down-the-hole drilling anti-collapse technique of fast blockage, in drilling process, stratum occurs crack or collapses
When phenomenon of collapsing, for the method for leak stopping, include the following steps；
Step 1: polyvinyl alcohol water solution is prepared, as anti-sloughing agent.After polyvinyl alcohol water solution is dry, it can be formed very
Tough tear-resistant film, the wearability of film are also fine.The mechanical property of polyvinyl alcohol film can by plasticizer consumption, water content and
The items such as the different polyvinyl alcohol trades mark are adjusted.The polyvinyl alcohol of all trades mark all has hygroscopicity, and the film of polyvinyl alcohol is even
It still keeps not sticking and drying under high-temperature.Underground heat well section temperature is higher, and polyvinyl alcohol water solution can be fine as anti-sloughing agent
Adaptation subsurface environment.Polyvinyl alcohol water solution consolidates film forming within a short period of time, reduces the characteristics of accelerating solidification with temperature, with
And there is preferable bonding force characteristic, it eventually penetrates rock fracture and forms the stronger film of adhesion strength, be adsorbed on the borehole wall, reach fast
The anti-collapse effect of fast leak stopping.
Step 2: drilling tool is above mentioned to leakage section top, bottom plug, insulating liquid is successively pumped into drilling rod, until lower glue
Plug and the bruising of down-hole hammer impactor.Bottom plug and insulating liquid, lower glue are pumped by air compressor gas supply pipeline in this step
Plug has one-way, the lesser feature of crushing resistance.
Step 3: being successively pumped into drilling rod for polyvinyl alcohol water solution and top cement plug that the step 1 is prepared, can when being pumped into
To be pumped into air compressor gas supply pipeline by external linkage pump and three-way device, while opening air compressor air delivery valve
Door, the mixing wastewater with air liquid pump of formation is entered in well, and pump-in pressure is greater than the compression strength of bottom plug, and bottom plug is pumped into top cement plug
Being destroyed in the process makes polyvinyl alcohol water solution be injected into leakage section, until the top cement plug and the bruising of down-hole hammer impactor, gather
Vinyl alcohol aqueous solution injection leakage section is completed.Top cement plug has one-way, crushing resistance with respect to the biggish characteristic of bottom plug.According to brill
Bar and outer pipeline inner loop sky calculate gas pushing quantity.
Step 4: the polyvinyl alcohol water solution thickening condensation thickening film forming injected in the step 3, i.e. leak stopping are completed.It is anti-
After agent of collapsing injection leakage section, penetrate into has very strong affinity with rock stratum in crack, after polyvinyl alcohol water solution drying, can be formed
Very tough tear-resistant film, the wearability of film are also fine.So the rock stratum that can be very good to be crushed blocks.Polyethylene
Plugging operations are both completed after alcohol solution film forming.
Step one and step 2 in above-described embodiment can according to need selection sequencing.
In above-mentioned technical proposal, the polyvinyl acetate material that alcoholysis degree is 99% is chosen in step 1, when preparation and is added to
Heating makes polyvinyl acetate material dissolution be configured to polyvinyl alcohol water solution in water, and the mass percent of polyvinyl alcohol is 8%-
10%.The mass percent of polyvinyl alcohol determines that more serious, concentration is got over according to leakage severity in polyvinyl alcohol water solution
It is high.
In above-mentioned technical proposal, polyvinyl alcohol water solution passes through temperature regulating device for prepared polyvinyl alcohol after the completion of preparing
Aqueous temperature is controlled at 90 DEG C -95 DEG C.The polyvinyl alcohol water solution of alcoholysis degree 99% can just keep fluid at 90 degree or more
State, so keeping its fluid state being pumped into 90-95 DEG C of drilling rod preincubation.
In above-mentioned technical proposal, sodium sulfocyanate stabilizer is additionally added in the polyvinyl alcohol water solution of step 1 preparation.Generally
Underground heat well construction deep temperature is higher, to increase polyvinyl alcohol water solution by viscosity stability under the high temperature conditions, in step 1
Sodium sulfocyanate stabilizer is added in the polyvinyl alcohol water solution of preparation and keeps its viscosity stabilization.
In above-mentioned technical proposal, the mass percent of sodium sulfocyanate is 0.3%- in step 1 polyvinyl alcohol water solution
0.5%.
Embodiment 2:
In each technical solution in embodiment 1, more preferably, in step 2, drilling tool is above mentioned to leakage section top
Afterwards, after being first pumped into cooling water into drilling rod to pre-processing in well, then bottom plug, insulating liquid are successively pumped into drilling rod.It is cold
But water can be pumped by air compressor air inlet pipe, on the one hand cooling water can rinse drilling rod inner wall and impactor well,
On the other hand purpose formation temperature can be reduced, is conducive to the fast filming of polyvinyl alcohol water solution.
Embodiment 3:
In each technical solution in embodiment 1 and embodiment 2, the drilling tool in step 1 is above mentioned to section 3-5 meters of leakage
Place；
Select compression strength for the bottom plug of 3-5MPA in step 2；
Select compression strength for the top cement plug of 6-8MPA in step 3.
Embodiment 4:
In each technical solution in embodiment 1, embodiment 2 and embodiment 3, top cement plug and down-hole hammer are rushed in step 4
After hitting device bruising, ejected wash water, pump-in pressure 9- are pumped into drilling rod again after drilling tool above being mentioned to leakage section top 10-15m
10MPA.Ejected wash water can be pumped by air compressor air inlet pipe, ejected wash water can clean the remaining polyvinyl alcohol of drilling rod inner wall
Solution, while bottom hole temperature (BHT) is reduced, so that the polyvinyl alcohol water solution being pumped into is accelerated film forming, improves working efficiency.
In the above-mentioned technical solutions, inner pressure inside pipe meets during step 1 to step 4: Pa < Pb < Pc, Pa in formula
For bottom plug compression strength；Pb is top cement plug compression strength；Pc is to be pumped into cleaning water pressure.
In the above-mentioned technical solutions, it is 2h-3h that film formation time is thickened in step 4.Entire blocking construction job requirements can
It is completed within the polyvinyl alcohol water solution thickening time, and includes certain safety coefficient.Generally+1 hour construction time <
Thickening time.
After completing the geothermal well closure work, drill bit is passed through into the leakage interval and continues to creep into subsequent stratum.
In conclusion technique of the invention is mainly used in geothermal well down-the-hole drilling construction, when the well in drilling process
When the crack Duan Fasheng or collapsing phenomenon, it is only necessary to by drilling tool lifting to leakage section top, then implement above-mentioned anti-collapse leak stopping work
Skill, poly-vinyl alcohol solution are also able to maintain drying as anti-sloughing agent, adapt to well section environment under high temperature after film forming, can be very good by
Broken formation is blocked, and can continue drilling operation after closure；Conventional close measure is first to propose drilling tool, into well section
Cement slurry is poured into, after cement infiltration crack consolidates fractured rock, then drilling is bored with down-hole hammer and is opened, continue drilling in next step
Process encounters broken serious well section of collapsing, needs multiple cement sealing that could complete.Leak-stopping technique of the invention and traditional
Leak-stopping technique is compared and substantially reduces construction period and save the cost, and then improves work efficiency.
It is recited above to implement to be only that preferred embodiments of the present invention will be described, not to the scope of the present invention
It is defined, without departing from the spirit of the design of the present invention, this field ordinary engineering and technical personnel is to technical solution of the present invention
The various changes and improvements made, should fall within the scope of protection determined by the claims of the present invention.
Claims (10)
1. a kind of geothermal well down-the-hole creeps into the anti-collapse technique of fast blockage, which is characterized in that include the following steps；
Step 1: polyvinyl alcohol water solution is prepared；
Step 2: drilling tool is above mentioned to leakage section top, bottom plug, insulating liquid are successively pumped into drilling rod, until bottom plug with
Down-hole hammer impactor bruising；
Step 3: polyvinyl alcohol water solution and top cement plug that the step 1 is prepared successively are pumped into drilling rod, pump-in pressure is greater than
The compression strength of bottom plug, bottom plug is destroyed during top cement plug is pumped into makes polyvinyl alcohol water solution be injected into leakage section,
Until the top cement plug and the bruising of down-hole hammer impactor, injection is completed；
Step 4: the polyvinyl alcohol water solution thickening condensation thickening film forming injected in the step 3, i.e. leak stopping are completed.
2. a kind of geothermal well down-the-hole according to claim 1 creeps into the anti-collapse technique of fast blockage, which is characterized in that the step
Rapid one, the polyvinyl acetate material that alcoholysis degree is 99% heating that is added to the water is chosen when preparation prepares polyvinyl acetate material dissolution
At polyvinyl alcohol water solution, the mass percent of polyvinyl alcohol is 8%-10%.
3. a kind of geothermal well down-the-hole according to claim 2 creeps into the anti-collapse technique of fast blockage, which is characterized in that described poly-
Vinyl alcohol aqueous solution is controlled prepared polyvinyl alcohol water solution temperature at 90 DEG C -95 by temperature regulating device after the completion of preparing
℃。
4. a kind of geothermal well down-the-hole according to claim 3 creeps into the anti-collapse technique of fast blockage, which is characterized in that the step
Sodium sulfocyanate stabilizer is additionally added in the polyvinyl alcohol water solution of a rapid preparation.
5. a kind of geothermal well down-the-hole according to claim 4 creeps into the anti-collapse technique of fast blockage, which is characterized in that the step
The mass percent of sodium sulfocyanate is 0.3%-0.5% in a rapid polyvinyl alcohol water solution.
6. a kind of geothermal well down-the-hole according to claim 1-5 creeps into the anti-collapse technique of fast blockage, feature exists
In, the step 2 above mentions drilling tool to leakage section top, after being first pumped into cooling water into drilling rod to pre-processing in well,
Bottom plug, insulating liquid are successively pumped into drilling rod again.
7. a kind of geothermal well down-the-hole according to claim 1-5 creeps into the anti-collapse technique of fast blockage, feature exists
In drilling tool is above mentioned to section 3-5 meters of leakage in the step 1；Bottom plug compression strength is 3-5MPA in the step 2；Step
Top cement plug compression strength is 6-8MPA in rapid three.
8. a kind of geothermal well down-the-hole according to claim 1-5 creeps into the anti-collapse technique of fast blockage, feature exists
In after the top cement plug and the bruising of down-hole hammer impactor, drilling tool above being mentioned to leakage section top 10-15m in the step 4
Ejected wash water, pump-in pressure 9-10MPA are pumped into drilling rod again.
9. a kind of geothermal well down-the-hole according to claim 8 creeps into the anti-collapse technique of fast blockage, which is characterized in that the step
Rapid one meets to inner pressure inside pipe during step 4: Pa < Pb < Pc, and Pa is bottom plug compression strength in formula；Pb is top cement plug
Compression strength；Pc is to be pumped into cleaning water pressure.
10. a kind of geothermal well down-the-hole according to claim 9 creeps into the anti-collapse technique of fast blockage, which is characterized in that described
It is 2h-3h that film formation time is thickened in step 4.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| 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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| 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 |
| CN110205106A (en) * | 2019-05-27 | 2019-09-06 | 吉林省安和石油技术服务有限公司 | A kind of oil field low pressure natural gas well leak stopping interleaving agent and preparation method thereof |
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| EP1555385A1 (en) * | 2004-01-16 | 2005-07-20 | Services Petroliers Schlumberger SA | Method of consolidating an underground formation |
| CN101250398A (en) * | 2008-03-25 | 2008-08-27 | 施晓红 | Well drilling leak-proof sealing agent |
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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 |
| CN110205106A (en) * | 2019-05-27 | 2019-09-06 | 吉林省安和石油技术服务有限公司 | A kind of oil field low pressure natural gas well leak stopping interleaving agent and preparation method thereof |
| 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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