CN102268963B - Basement rock fractured formation mixed drilling well completion process - Google Patents
Basement rock fractured formation mixed drilling well completion process Download PDFInfo
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Abstract
The invention discloses a basement rock fractured formation mixed drilling well completion process. The process comprises the following process steps of: (1) drilling at a certain depth from an upper part loose layer to a basement rock layer by a mud positive circulation process, inserting a surface casing after the drilling, and fixedly sealing by using cement; (2) drilling the basement rock layer by an air downhole hammer reverse circulation process; (3) after a water-bearing layer is drilled, drilling convertibly by a gas lift reverse circulation process until a target layer is reached when drilling efficiency is influenced by back pressure, which is generated by a water column in a hole, on the downhole hammer; (4) washing a well by acidification; (5) washing the well by using a piston; (6) washing the well by using air; and (7) pumping water by using a water pump to complete the well, namely putting a submersible pump down to pump the water after the process that the well is washed by the air is finished until a water pumping test is finished. The invention has the advantages that: 1, dry holes are avoided or reduced, and construction risks are reduced; 2, a well constructioncycle is shortened, unnecessary investment is reduced, and production cost is reduced; 3, mud is not used, fresh water resources are saved, and environment pollution caused by mud construction or emission is prevented; and 4, all fractures are changed into water catchment channels to the maximum extent to realize the maximum water yield of a single hole.
Description
Technical field
The present invention relates to a kind of drilling technology, especially a kind of basement rock fractured formation mixed drilling well completion process.
Background technology
The aquifer lithology of Bedrock Crevice Water is take intrusive rock class, lava, volcano lava as main, groundwater occurrence at the joint, structural fracture, weathering fissures and the separation fracture fracture zone of fracture of growing.2～3 millimeters of general Fracture Widths, 10～20 millimeters of large persons, rice more than long number rice to ten, underground water are enriched in north-south, northwest (NW) relatively in a property or the property turned round crack, and take diving as main, there is the veiny artesian water fracture zone of fracture part.Watery is uneven, and the water yield is poor, general 0.008～0.4 liter/second of spring flow, people's well yield 3～12 ton per days, drilling well single hole water yield 3～200 ton per days.
When utilizing the conventional drilling construction technology, to carry drilling cuttings ability and its viscosity (the higher mud cake of viscosity stops up more serious) relevant with shear force due to mud, often cause drilling cuttings to repeat in the shaft bottom broken, repeat the part drilling cuttings to be ground broken the time in borehole wall crack, form artificial the obstruction, affect water yield.In addition, the swell soil in mud or clay particle usually are penetrated in bedrock fracture, form hard mud cake and also can stop up the crack under differential pressure action.
The crack is less originally for basement rock fractured formation, and the water yield is poor, usually brings out again mud and drilling cuttings and stop up in drilling process.Long because of the common process drilling period again, Cheng Jinghou drilling cuttings, mud cake and charges are difficult for coming out, and cause the less or anhydrous dry hole that becomes of single hole water yield, make drilling well lose meaning.For avoiding stopping up the less or anhydrous result of the water yield that causes, therefore, study a kind of crack of avoiding artificially stopping up, also to as much as possible strengthen simultaneously the basement rock fractured formation mixed drilling well completion process of the permeability in crack, be the present technical issues that need to address.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of basement rock fractured formation mixed drilling well completion process.
The technical scheme that the present invention solves its technical problem is:
Basement rock fractured formation mixed drilling well completion process, its processing step is: 1. top unconsolidated formation to horizon d certain depth uses the mud normal circulation technology to creep into, be lowered to surface pipe after boring and use cement sealing, 2. horizon d uses air latent drift reverse circular technique to creep into, after 3. being drilled into the aquifer, when water column produces back pressure and affects drilling efficiency down-hole hammer to the hole, using gas lift reverse circulation technique instead creeps into, until target zone, 4. acidizing flushing
The piston well-flushing,
Air circulation,
The pumping for water pump completion, dive pumping for water pump at once after namely air circulation finishes is until pumping test is completed.
Preferably, after described acidizing flushing is the drilling well end-of-job, first carry out electrical measurement and sentence layer, determine the position, crack of target zone according to electrical measurement result and the data of sieving residue log, then calculate the hydrochloric acid consumption, determine concentration of hydrochloric acid, re-use the slush pump acid filling, static certain hour after acid filling makes hydrochloric acid and gapfiller that chemical reaction fully occur, decompose or softening filler, then inject and the clear water of hydrochloric acid content with volume in the hole from the aperture.
Preferably, during acid filling first with under the acid filling drilling tool at the bottom of the hole, the water filling pressure testing checks acid filling pipeline seal, then begins water filling, measures to inject clear water amount and aperture whether rout up the water yield consistent, if it is consistent with injection clear water amount to rout up the water yield, adopt disposable acid filling at the bottom of the hole, if inconsistent, adopt at the bottom of the hole first layer position, crack to begin successively upwards in each layer position, crack acid filling respectively, after acid filling finishes, drilling tool in the hole is proposed.
Preferably, concentration of hydrochloric acid is 15%～30%, and concentration of hydrochloric acid is generally 20% left and right, if the more repeatedly acid filling of filler or strengthen concentration of hydrochloric acid in the crack, but concentration can not surpass 30%, and be 4～8 hours quiescent time.
Preferably, described piston well-flushing has namely been annotated lower piston in clear water backward hole, when the piston depth of setting guarantees to draw piston on piston starting point below hydrostatic level, draw continuously piston or intermittently draw piston all can, the piston rising or falling speed is 1～3 meter per second, draws the piston cumulative time to be not less than 12 hours.
Preferably, the piston depth of setting is following 30 meters～50 meters of hydrostatic level.
Preferably, described air circulation is namely after the piston well-flushing finishes, employing is lowered to common drilling tool air compressor machine well-flushing or is lowered to the both arms drilling tool and common drilling tool employing gas lift reverse circulation well-flushing, less Kong Zhongke adopts foam blocking to coordinate air circulation in the water yield, to form larger suction force, the well-flushing duration reaches " water is clear husky clean " as principle take the aperture water outlet.
Know-why of the present invention:
Bedrock Crevice Water is composed the fracture zone of fracture that exists joint, structural fracture, weathering fissures and separation fracture to grow.2～3 millimeters of general Fracture Widths, 10～20 millimeters of large persons, rice more than long number rice to ten, watery is uneven, and the water yield is poor.Some gapfillers of filling usually in the crack, impact or stop up the charge for remittance passage causes water yield of well less.
The crack is less originally for basement rock fractured formation, the water yield is poor, usually bringing out mud and drilling cuttings when utilizing the conventional drilling construction technology stops up, long because of the common process drilling period again, Cheng Jinghou drilling cuttings, mud cake and charges are difficult for coming out, cause the less or anhydrous dry hole that becomes of single hole water yield, make drilling well lose meaning.For avoiding stopping up the less or anhydrous result of the water yield that causes, only have the research one novel drilling process of cover, avoid artificially stopping up the crack, also to as much as possible strengthen simultaneously the permeability in crack.
Method is exactly: the anti-blocking yield-increasing technology of basement rock fractured formation well (adopt air reverse circulation drilling, get into acidizing flushing after target zone, piston well-flushing, gas lift reverse circulation well-flushing or air compressor machine well-flushing).
Adopt air reverse circulation drilling, can avoid mud cake to stop up; Adopt air reverse circulation drilling can also guarantee drilling cuttings in the very first time from hole on bottom, avoid the repetition fragmentation that the part drilling cuttings is ground in borehole wall crack; Adopt air reverse circulation drilling can also rinse, carry out the charges in the crack, to increase the crack water permeable area.Make to greatest extent every crack all become the charge for remittance passage, to realize the single hole max water yield, reduce construction risk, reduce unnecessary investment, the environment pollution of avoiding mud to cause, fresh-water-saving resource.
Acidizing flushing is the effective measures of volume increase, and particularly the carbonate strata effect is very remarkable.Utilize hydrochloric acid to the chemical action of stratum and gapfiller, form a kind of extension crack and strengthen the crack, to reach the purpose that increases water yield.Acidizing flushing should be better in conjunction with the water filling working effect.
The piston well-flushing is the more creviced formation of the effective measures of getting through the crack passage, particularly filler.The piston well-flushing can be with the filler in the crack or the drilling cuttings fallen in the crack when creeping into release, to get through the purpose that the crack passage reaches increases water yield.
Gas lift reverse circulation well-flushing, air compressor machine well-flushing can be discharged wellhole with the sediment in boring, to guarantee effective drilling depth, avoid affecting water yield.
The anti-blocking yield-increasing technology points for attention of basement rock fractured formation water and technical essential:
The reverse circulation drilling of air latent drift can only used without water hole section or the stratum that goes out a small amount of water section.If the stratum water yield is larger, anti-circulation can not be discharged to water outlet outside the hole again, and when the hole internal water accumulation was flowed or blow over and cover completely the down-hole hammer certain altitude, the down-hole hammer operating efficiency reduced, and when down-hole hammer creeps into efficient lower than 2 m/hs, pull out of hole and use gas lift reverse circulation technique instead and continue to creep into.
Gas-water mixer is generally 3～4 times of gas-water mixer submersible depth with the drilling tool length down to drill bit, generally be no more than 7 times.
Calculate hydrochloric acid consumption: Q=r
2Π 2H,
Q in formula---hydrochloric acid content (m3)
R---boring radius (m)
Π---pi
H---need acid filling hole segment length (m)
Determine concentration of hydrochloric acid.For guaranteeing safe acid filling, concentration of hydrochloric acid is generally 20% left and right, if the more repeatedly acid filling of filler or strengthen concentration of hydrochloric acid in the crack, but concentration can not surpass 30%.
Use the slush pump acid filling, first that acid filling drilling tool (or oil pipe) is lower at the bottom of the hole, water filling pressure testing (pressure test pressure should be when replacing hydrochloric acid pressure 50%) checks acid filling pipeline seal.Then begin water filling, whether measure injecting clear water amount and aperture, to rout up the water yield consistent.If inconsistent, acid filling can not be disposable firmly complete at the bottom of the hole, should begin to inject hydrochloric acid in first layer position, crack at the bottom of the hole, successively upwards in each layer position, crack difference acid filling.
After acid filling finishes, drilling tool (or oil pipe) in the hole is proposed, static 4～8 hours, make hydrochloric acid and gapfiller that chemical reaction fully occur, decompose or softening filler.Then inject and the clear water of hydrochloric acid content with volume in the hole from the aperture.Annotated lower piston in clear water backward hole.
5, piston well-flushing.The piston depth of setting is 30 meters～50 meters (on piston, starting point gets final product below hydrostatic level when drawing piston) below hydrostatic level.The piston rising or falling speed is 1～3 meter per second.Draw the piston cumulative time to be not less than 12 hours.
6, gas lift reverse circulation well-flushing, air compressor machine well-flushing.Adopt the gas lift reverse circulation well-flushing, the drilling tool water inlet will be positioned at the crack layer, and from going up most crack layer well-flushing successively downwards, until clean at the bottom of the hole.
Be lowered to common drilling tool air compressor machine well-flushing, the drilling tool depth of setting is determined according to the air compressor machine ability to bear, turns over the air water post as long as can form, and produces suction force and gets final product.Less Kong Zhongke adopts foam blocking to coordinate air circulation in the water yield, has formed larger suction force.The well-flushing duration reaches " water is clear husky clean " as principle take the aperture water outlet.
Gas lift reverse circulation well-flushing, air compressor machine well-flushing can be discharged wellhole with the sediment in boring, to guarantee effective drilling depth, avoid affecting water yield.
Compared with prior art, have the following advantages:
1, avoid or reduce the appearance of dry hole, reduce construction risk.
2, shorten well construction period, reduce unnecessary investment, reduce production costs.
3, do not use mud, fresh-water-saving resource, the environment pollution of avoiding mud construction or discharging to cause.
4, make to greatest extent every crack all become the charge for remittance passage, to realize the single hole max water yield.
The specific embodiment
Basement rock fractured formation mixed drilling well completion process, its processing step is: 1. top unconsolidated formation to horizon d certain depth uses the mud normal circulation technology to creep into, be lowered to surface pipe after boring and use cement sealing, 2. horizon d uses air latent drift reverse circular technique to creep into, after 3. being drilled into the aquifer, when water column produces back pressure and affects drilling efficiency down-hole hammer to the hole, using gas lift reverse circulation technique instead creeps into, until target zone, 4. acidizing flushing
The piston well-flushing,
Air circulation,
The pumping for water pump completion, dive pumping for water pump at once after namely air circulation finishes is until pumping test is completed.
After described acidizing flushing is the drilling well end-of-job, first carry out electrical measurement and sentence layer, determine the position, crack of target zone according to electrical measurement result and the data of sieving residue log, then calculate the hydrochloric acid consumption, determine concentration of hydrochloric acid, re-use the slush pump acid filling, static certain hour after acid filling, make hydrochloric acid and gapfiller that chemical reaction fully occur, decompose or softening filler, then inject and the clear water of hydrochloric acid content with volume in the hole from the aperture.
During acid filling first with under the acid filling drilling tool at the bottom of the hole, the water filling pressure testing checks acid filling pipeline seal, then begin water filling, whether measure injecting clear water amount and aperture, to rout up the water yield consistent, if rout up the water yield and inject that the clear water amount is consistent adopts disposable acid filling at the bottom of the hole, if inconsistent, adopt at the bottom of the hole first layer position, crack to begin successively upwards in each layer position, crack acid filling respectively, after acid filling finishes, drilling tool in the hole is proposed.
Concentration of hydrochloric acid is 15%～30%, and concentration of hydrochloric acid is generally 20% left and right, if the more repeatedly acid filling of filler or strengthen concentration of hydrochloric acid in the crack, but concentration can not surpass 30%, and be 4～8 hours quiescent time.
Described piston well-flushing has namely been annotated lower piston in clear water backward hole, when the piston depth of setting guarantees to draw piston on piston starting point below hydrostatic level, draw continuously piston or intermittently draw piston all can, the piston rising or falling speed is 1～3 meter per second, draws the piston cumulative time to be not less than 12 hours.
The piston depth of setting is following 30 meters～50 meters of hydrostatic level.
Described air circulation is namely after the piston well-flushing finishes, employing is lowered to common drilling tool air compressor machine well-flushing or is lowered to the both arms drilling tool and common drilling tool employing gas lift reverse circulation well-flushing, less Kong Zhongke adopts foam blocking to coordinate air circulation in the water yield, to form larger suction force, the well-flushing duration reaches " water is clear husky clean " as principle take the aperture water outlet.
Claims (7)
1. basement rock fractured formation mixed drilling well completion process, it is characterized in that: its processing step is: 1. top unconsolidated formation to horizon d certain depth uses the mud normal circulation technology to creep into, be lowered to surface pipe after boring and use cement sealing, 2. horizon d uses air latent drift reverse circular technique to creep into, 3. after being drilled into the aquifer, when water column produces back pressure and affects drilling efficiency down-hole hammer to the hole, using gas lift reverse circulation technique instead creeps into, until target zone, 4. acidizing flushing, 5. piston well-flushing, 6. air circulation, 7. pumping for water pump completion, it is dive pumping for water pump at once after air circulation finishes, until pumping test is completed.
2. basement rock fractured formation mixed drilling well completion process according to claim 1, it is characterized in that: after described acidizing flushing is the drilling well end-of-job, first carry out electrical measurement and sentence layer, determine the position, crack of target zone according to electrical measurement result and the data of sieving residue log, then calculate the hydrochloric acid consumption, determine concentration of hydrochloric acid, re-use the slush pump acid filling, static certain hour after acid filling, make hydrochloric acid and gapfiller that chemical reaction fully occur, decompose or softening filler, then inject and the clear water of hydrochloric acid content with volume in the hole from the aperture.
3. basement rock fractured formation mixed drilling well completion process according to claim 2, it is characterized in that: during acid filling first with under the acid filling drilling tool at the bottom of the hole, the water filling pressure testing checks acid filling pipeline seal, then begin water filling, whether measure injecting clear water amount and aperture, to rout up the water yield consistent, if it is consistent with injection clear water amount to rout up the water yield, disposable acid filling at the bottom of the employing hole, if inconsistent, employing first layer position, crack at the bottom of the hole begins successively upwards in each layer position, crack difference acid filling, after acid filling finishes, drilling tool in the hole is proposed.
4. basement rock fractured formation mixed drilling well completion process according to claim 2, it is characterized in that: concentration of hydrochloric acid is 15%～30%, be 4～8 hours quiescent time.
5. basement rock fractured formation mixed drilling well completion process according to claim 2, it is characterized in that: described piston well-flushing has namely been annotated lower piston in clear water backward hole, when the piston depth of setting guarantees to draw piston on piston starting point below hydrostatic level, draw continuously piston or intermittently draw piston all can, the piston rising or falling speed is 1～3 meter per second, draws the piston cumulative time to be not less than 12 hours.
6. basement rock fractured formation mixed drilling well completion process according to claim 5 is characterized in that: the piston depth of setting is following 30 meters～50 meters of hydrostatic level.
7. basement rock fractured formation mixed drilling well completion process according to claim 1, it is characterized in that: described air circulation is namely after the piston well-flushing finishes, employing is lowered to common drilling tool air compressor machine well-flushing or is lowered to the both arms drilling tool and common drilling tool employing gas lift reverse circulation well-flushing, less Kong Zhongke adopts foam blocking to coordinate air circulation in the water yield, to form larger suction force, the well-flushing duration reaches " water is clear husky clean " as principle take the aperture water outlet.
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| CN103161405B (en) * | 2013-03-03 | 2015-07-29 | 中国矿业大学 | Mine underground visits the casing off stratum crushing band method of putting high pressure karst water drilling construction |
| CN103867119B (en) * | 2014-02-27 | 2016-08-03 | 中国石油天然气股份有限公司 | Coal seam reservoirs completion remodeling method |
| US10337249B2 (en) | 2017-02-04 | 2019-07-02 | Jason A Hatfield | Drilling wells with air |
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| US4237974A (en) * | 1978-05-09 | 1980-12-09 | The Dow Chemical Company | Method of controlling fluid loss in acidizing treatment of a subterranean formation |
| US6772847B2 (en) * | 2002-02-26 | 2004-08-10 | Bj Services Company | Chemically enhanced drilling methods |
| US8714244B2 (en) * | 2007-12-18 | 2014-05-06 | Schlumberger Technology Corporation | Stimulation through fracturing while drilling |
| CN101718184B (en) * | 2009-12-15 | 2013-10-30 | 中国石油大学(华东) | Foamed acid washing technological method for horizontal well |
| CN101929309B (en) * | 2010-08-16 | 2011-08-31 | 邯郸市伟业地热开发有限公司 | Gas lift reverse circulation drilling process |
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Denomination of invention: Hybrid drilling technology for bedrock fracture formation Effective date of registration: 20220920 Granted publication date: 20130522 Pledgee: Guangping County Rural Credit Cooperative Pledgor: HANDAN WEIYE GEOTHERMAL DEVELOPMENT CO.,LTD. Registration number: Y2022130000073 |
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Address after: 057651 North side of the middle section of Jin Guangyuan Road, Guangping County, Handan City, Hebei Province Patentee after: Hebei Weiye Geothermal New Energy Technology Co.,Ltd. Address before: 057650 South of Renmin Road East Section, Guangping County, Handan City, Hebei Province Patentee before: HANDAN WEIYE GEOTHERMAL DEVELOPMENT CO.,LTD. |