CN104879112A - Nano fracturing process with function of desorption acceleration - Google Patents
Nano fracturing process with function of desorption acceleration Download PDFInfo
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- CN104879112A CN104879112A CN201410080866.8A CN201410080866A CN104879112A CN 104879112 A CN104879112 A CN 104879112A CN 201410080866 A CN201410080866 A CN 201410080866A CN 104879112 A CN104879112 A CN 104879112A
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Abstract
The invention belongs to fields of underground energy development, reserve increase, yield increase and reservoir modification and discloses a nano fracturing process with a function of desorption acceleration. The nano fracturing process includes: removing well incrustations by well flushing, sequentially dissolving fracturing fluid CFs, liquid-state retardant acid CArL, stratum authigenic latent acid CAP, solid-state retardant acid CArS and acidic viscoelastic cleaning foam fracturing fluid VCFa, performing acidic sand fracturing, breaking viscosity, flowing back, communicating and broadening nano apertures. Network cracks in nano size, micron size, millimeter size and centimeter size can be constructed efficiently with low cost while desorption speed, diffusion rate and seepage velocity are increased, industrial exploitation of compact oil gas, adsorption oil (shale oil) and adsorption gas (coalbed methane and shale gas) in nano pores can be realized, and industrial power generation of thermal energy of hot dry rocks is realized.
Description
Technical field:
The invention belongs to underground energy exploitation increasing the storage volume increase reservoir reconstruction fracturing technique, the special nanometer fracturing technique proposing raising desorption rate.
Technical background:
Utilize hydraulic action, with fracturing unit truck high-pressure large-displacement, the thick liquid of mixing proppant is clamp-oned oil reservoir, form crack, proppant pack crack at reservoir, improve the penetrating power of oil-gas Layer, improve production capacity, this technology is called pressure break.
Pressure break is the key realizing the production of fine and close oil and gas industryization, the key of coal bed gas, shale gas, shale wet goods adsorbed gas, adsorbed oil suitability for industrialized production especially.Fracturing fluid, fracturing procedures, fracturing technology are the keys of fracturing technique.The key of the fracturing fluid key of fracturing technique especially.
The oil-gas reservoir of China is all hypotonic, Oil in Super-low Permeability oil-gas reservoir substantially, and pressure break not there is no production capacity.The U.S. exploitation coal bed gas, shale gas, be all pressuredly split formation production capacity substantially, U.S.'s shale gas adopts 20000m
3the pressure break of heavy dose of huge discharge, facilitates the suitability for industrialized production of shale gas.Can say there is no present petroleum industry without pressure break, there is no oil-production capacity without pressure break.Conventional fracturing fluid has aqueous fracturing fluid, oil base fracturing fluid, emulsus fracturing fluid, foam fracturing fluid and acid-base fracturing fluid 5 kinds of fundamental types.Pressure break selects the principle of well: the well that (1) oil-gas Layer is contaminated or blocking is larger; (2) note is not entered the well that water or water filling do not take effect.Fracturing Technology mainly contains layering and sleective fracturing technology, the high fracturing technique of control seam.Layering and sleective fracturing are divided into packer layered pressure break, the separate stratum fracfturing of current limliting method.Packer layered pressure break has: single packer layered pressure break, twin packer separate stratum fracfturing, bridging plug packer layered pressure break, slide sleeve packer separate stratum fracfturing.The object adopting various ways fracturing technique is exactly adopt different fracturing technique for different reservoirs, obtains preferably the most effective fracturing effect, obtains the high yield of long duration.
Existing petroleum geology, petroleum works are all based on seepage flow.The examination & verification of existing reserves is also based on seepage flow, only consider to be greater than porosity cutoff, can the reservoir of seepage flow.Existing oil-gas reservoir of having developed is all that reserves abundance is very high can the reservoir of seepage flow.For in the nanoscale hole below porosity cutoff, be enriched in nanoaperture the flood tide adsorbed gas, the adsorbed oil that are difficult to seepage flow with ADSORPTION STATE, all do not consider both at home and abroad to produce.The Objective Concept of reservoir can the high thin layer of seepage flow reserves abundance change into can the high thin layer of seepage flow reserves abundance and adsorbed gas, thick-layer that adsorbed oil content is high.Existing fracturing technique based on seepage flow can only link up low permeability reservoir, improves seepage velocity, improves flow conductivity; Can not desorption rate be improved, can not diffusion velocity be improved.
The countries such as the U.S. are successful commercialization exploiting coal bed methane, shale gas.Coal bed gas gas reservoir, the shale gas gas reservoir of the country such as the U.S. are all oversaturated, i.e. hole, fracture development, and the free gas reserves in hole, crack are high, the free gas in the mainly hole of production, crack.75% is free gas, and 25% is adsorbed gas.
The fracturing technique of the U.S. is also just based on seepage flow, and this is the basic reason that U.S.'s methane output can not continue to rise.
Coal bed gas gas reservoir, the shale gas gas reservoir of China are all undersaturated substantially, i.e. hole, crack agensis, the free gas in hole, crack does not almost have, and 95% is adsorbed gas.Pressure break based on seepage flow, instead of to improve the pressure break based on desorption rate is that Coalbed Methane In China can not the basic reason of suitability for industrialized production.
Summary of the invention:
The object of the invention is first by well-flushing removing well dirt, carry out clean dissolving fracturing fluid CFs, liquid cleaning retarded acid CArL successively, stratum self-generating cleans potential sour CAP, solid-state clean retarded acid CArS, the sand fracturing of acidic group viscoplasticity cleaning foam fracturing fluid VCFa acid adding, greatly reduce fracture pressure, greatly reduce operation pressure, greatly low-cost high-efficiency ground forms fracturing fluid and flows through nanoscale huge in region, micron order, grade, the Centimeter Level volume network system; The lasting unimpeded of established volume network fracture is ensured again by broken glue, the row of returning, production.The present invention had both emphasized that nanometer fracturing technique formed volume network fracture, emphasized again the lasting unimpeded of volume network fracture.The present invention establishes the nanometer fracturing technique of the fracturing fluid of nanometer pressure break, of the fracturing fluid pressing crack construction program and construction technology system engineering system, improve desorption rate, diffusion velocity and seepage velocity simultaneously, make adsorbed gas in nanoaperture (coal bed gas, shale gas), adsorbed oil (shale oil), super fine and close oil gas realize industrialization exploitation greatly low-cost high-efficiency, make hot dry rock heat energy realize industrialization generating.
Innovation of the present invention:
For adsorbed gas, adsorbed oil, also there is no real development theories and method both at home and abroad.
Also really do not solve the fracturing technique of adsorbed gas, adsorbed oil raising desorption rate both at home and abroad.Existing domestic and international fracturing technique relies on the powerful fractured rock of powerful pressure, presses off and forms single slit, and linking up can the reservoir of seepage flow.In fact, there is huge being filled with, by cementing disconnected natural void, fracture network in reservoir itself.As long as with a small amount of dissolving, corrosion fracturing fluid just can dissolve, corrosion natural void, fracture network, link up, expand these disconnected natural void, fracture networks, huge release rock stress, greatly reduce fracture pressure, greatly reduce operation pressure, greatly low-cost high-efficiency ground forms huge nanoscale, micron order, grade, the Centimeter Level volume network system, and greatly low-cost high-efficiency ground obtains the industrialization exploitation of adsorbed gas, adsorbed oil.
Practicality of the present invention:
Shale oil is actual is adsorbed oil.The thick all enrichments shale oil of whole eight gulf, the road group 200 meters of Tarim Basin In Xinjiang.The oil-sand also enrichment adsorbed oil of shallow-layer.Also enrichment adsorbed oil in the basement rock of thick oil reservoir.
Adsorbed gas, adsorbed oil reserves are extremely huge.Rock is finer and close, and the content of adsorbed gas, adsorbed oil is larger.In the fine and close basement rock of the oil-gas reservoir of having developed, the content of adsorbed gas, adsorbed oil is also abnormal large.The clean fracturing fluid that dissolves is as adsorbed gas, the prepad fluid adsorbing wet goods oil-gas reservoir pressure break, build, link up, expand nano-pore seam makes seam pilot hole seam as further pressure break, for carrying out acid fracturing further, nanoscale is built in sand fracturing, micron order, grade map cracking create basis, really makes the reserves such as coal bed gas, shale gas abnormal huge adsorbed gas, adsorbed oil suitability for industrialized production.
The hot dry rock heat energy power-generating that underground is deeper than 3000 meters has a high potential.All extremely show great attention to hot dry rock heat energy power-generating both at home and abroad, the international developed country such as the U.S., Canada has all dropped into huge fund exploitation hot dry rock heat energy power-generating for a long time, not yet realizes industrialization exploitation so far.The clean pressure break hydraulic pressure that dissolves is adopted to split, dissolve hot dry rock (mainly granite) and form nanometer, micron openings seam, build the first seam guide of nanoscale, for carrying out acid fracturing further, sand fracturing makes and builds nanoscale, micron order, grade map cracking, build hot dry rock and manually store up fluid layer, long-term sustainable exploitation hot dry rock heat energy power-generating.Earth any place can utilize hot dry rock heat energy power-generating.
The nanometer fracturing technique improving desorption rate has broad prospect of application.
Improve the nanometer fracturing technique of desorption rate and can make that China is existing to have developed in oil-gas reservoir in fine and close basement rock by adsorbed oil, adsorbed gas that everyone ignores, realize low-cost high-efficiency industrialization exploitation, greatly increasing the storage volume increase.
The nanometer fracturing technique improving desorption rate has huge strategic importance, not only can solve the urgent need energy that China increases severely day by day, and can break through again the world and block the energy of China, can also expand employment rate.The nanometer fracturing technique improving desorption rate is the extremely important guarantee realizing Chinese dream.
Example 1. coal bed gas well builds the nanometer fracturing technique of nano-pore seam.Design pressure break total amount 300m
3~ 2000m
3.
1. well-flushing, with the spontaneous clean solid-state clean retarded acid CArSco+99% water of potential sour CAPco+0.5% of 0.5% coal bearing seams, liquid measure 20m
3~ 30m
3the positive well-flushing of huge discharge.
2. just squeezing 1% coal petrography clean dissolving fracturing fluid CFsco+99% water, 50m
3~ 200m
3, inject discharge capacity: 0.5m
3/ min ~ 6m
3/ min.First small displacement 0.5 ~ 1m
3/ min injects, and progressively improve discharge capacity, maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.
3. just squeeze 1% coal petrography liquid cleaning retarded acid CArLco+99% water 50m
3~ 100m
3, inject discharge capacity: 0.5m
3/ min ~ 6m
3/ min.Maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.
4. just squeezing the spontaneous clean solid-state clean retarded acid CArSco+99% water 100m of potential sour CAPco+0.5% coal petrography of 0.5% coal bearing seams
3~ 400m
3, inject discharge capacity: 0.5m
3/ min ~ 6m
3/ min.Maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.
5. just squeeze 0.1% ~ 1% coal petrography acidic group viscoplasticity cleaning foam fracturing fluid VCFaco+12% [31%HCI]+2% [41%HF]+85.9% ~ 85% water, 100m
3~ 400m
3, inject discharge capacity: 0.5m
3/ min ~ 6m
3/ min.Maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.
6. add sand with tee piece and add matrix acidizing.Tee piece two entrances, an inlet calibre is large, and an inlet calibre is little, an outlet.The outlet of tee piece connects well head.1% coal petrography acidic group viscoplasticity cleaning foam fracturing fluid VCFaco+99% water, 300m
3~ 500m
3, press working design sand than mulling by fracturing blender truck, connect the heavy caliber entrance of tee piece, discharge capacity 4m
3/ min ~ 8m
3/ min or by design discharge capacity.0.1% ~ 1% coal petrography acidic group viscoplasticity cleaning foam fracturing fluid VCFaco+12% [31%HCI]+2% [41%HF]+85.9% ~ 85% water, 100m
3~ 400m
3, connect the small-bore entrance of tee piece, discharge capacity 0.5m
3/ min ~ 3m
3/ min or by design discharge capacity.Maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.
7. just squeeze the solid-state clean retarded acid CArSco+99.5% water of 0.5% coal petrography and break glue, 50m
3~ 400m
3, discharge capacity 0.5m
3/ min ~ 1m
3/ min or by design discharge capacity.
8. just squeeze 20m with 5%KCl ~ 15%KCl liquid
3~ 30m
3prevent other fluids from entering stratum.
9. pressing crack construction must the row's of returning raffinate in 2 hours ~ 8 hours after completing.Must start to produce internal drainage gas production in 10 hours.
According to concrete reservoir conditions and execution conditions adjustment construction sequence, construction liquid, construction liquid measure.
The nanometer fracturing technique of nano-pore seam built by example 2. shale gas well.Design pressure break total amount 300m
3~ 2000m
3.
1. well-flushing, with the spontaneous clean solid-state clean retarded acid CArSsh+99% water of potential sour CAPsh+0.5% shale of 0.5% shale formation, liquid measure 20m
3~ 30m
3the positive well-flushing of huge discharge.
2. just squeezing 1% shale clean dissolving fracturing fluid CFssh+99% water, 50m
3~ 200m
3, inject discharge capacity: 0.5m
3/ min ~ 6m
3/ min.First small displacement 0.5 ~ 1m
3/ min injects, and progressively improve discharge capacity, maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.
3. just squeeze 1% shale liquid cleaning retarded acid CArLcsh+99% water 50m
3~ 100m
3, inject discharge capacity: 0.5m
3/ min ~ 6m
3/ min.Maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.
4. just squeezing the spontaneous clean solid-state clean retarded acid CArSsh+99% water 100m of potential sour CAPsh+0.5% shale of 0.5% shale formation
3~ 400m
3, inject discharge capacity: 0.5m
3/ min ~ 6m
3/ min.First small displacement 0.5 ~ 1m
3/ min injects, and progressively improve discharge capacity, maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.
5. just squeeze 0.1% ~ 1% shale acidic group viscoplasticity cleaning foam fracturing fluid VCFash+12% [31%HCI]+2% [41%HF]+85.9% ~ 85% water, 100m
3~ 400m
3, inject discharge capacity: 0.5m
3/ min ~ 6m
3/ min.Maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.
6. add sand with tee piece and add matrix acidizing.Tee piece two entrances, an inlet calibre is large, and an inlet calibre is little, an outlet.The outlet of tee piece connects well head.1% shale acidic group viscoplasticity cleaning foam fracturing fluid VCFash+99% water, 300m
3~ 500m
3, press working design sand than mulling by fracturing blender truck, connect the heavy caliber entrance of tee piece, discharge capacity 4m
3/ min ~ 8m
3/ min or by design discharge capacity.0.1% ~ 1% shale acidic group viscoplasticity cleaning foam fracturing fluid VCFash+12% [31%HCI]+2% [41%HF]+85.9% ~ 85% water, 100m
3~ 400m
3, connect the small-bore entrance of tee piece, discharge capacity 0.5m
3/ min ~ 3m
3/ min or by design discharge capacity.Maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.
7. just squeeze the solid-state clean retarded acid CArSsh+99.5% water of 0.5% shale and break glue, 50m
3~ 400m
3, discharge capacity 0.5m
3/ min ~ 1m
3/ min or by design discharge capacity.
8. just squeeze 20m with 5%KCl liquid
3~ 30m
3prevent other fluids from entering stratum.
9. pressing crack construction must the row's of returning raffinate in 2 hours ~ 8 hours after completing.Must in 10 hours opening well and making production.
According to concrete reservoir conditions and execution conditions adjustment construction sequence, construction liquid, construction liquid measure.
Example 3. tight sand oil gas water well builds the nanometer fracturing technique of nano-pore seam.Design pressure break total amount 300m
3~ 2000m
3.
1. well-flushing, with the spontaneous clean solid-state clean retarded acid CArSsa+99% water of potential sour CAPsa+0.5% sandstone of 0.5% sandstone formation, liquid measure 20m
3~ 30m
3the positive well-flushing of huge discharge.
2. just squeezing 1% sandstone clean dissolving fracturing fluid CFssa+99% water, 50m
3~ 200m
3, inject discharge capacity: 0.5m
3/ min ~ 6m
3/ min.First small displacement 0.5 ~ 1m
3/ min injects, and progressively improve discharge capacity, maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.
3. just squeeze 1% sandstone liquid cleaning retarded acid CArLsa+99% water 50m
3~ 100m
3, inject discharge capacity: 0.5m
3/ min ~ 6m
3/ min.Maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.
4. just squeezing the spontaneous clean solid-state clean retarded acid CArSsa+99% water 100m of potential sour CAPsa+0.5% sandstone of 0.5% sandstone formation
3~ 400m
3, inject discharge capacity: 0.5m
3/ min ~ 6m
3/ min.Maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.
5. just squeeze 0.1% ~ 1% sandstone acidic group viscoplasticity cleaning foam fracturing fluid VCFasa+12% [31%HCI]+2% [41%HF]+85.9% ~ 85% water, 100m
3~ 400m
3, inject discharge capacity: 0.5m
3/ min ~ 6m
3/ min.Maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.
6. add sand with tee piece and add matrix acidizing.Tee piece two entrances, an inlet calibre is large, and an inlet calibre is little, an outlet.The outlet of tee piece connects well head.1% sandstone acidic group viscoplasticity cleaning foam fracturing fluid VCFasa+99% water, 300m
3~ 500m
3, press working design sand than mulling by fracturing blender truck, connect the heavy caliber entrance of tee piece, discharge capacity 4m
3/ min ~ 8m
3/ min or by design discharge capacity.0.1% ~ 1% sandstone acidic group viscoplasticity cleaning foam fracturing fluid VCFasa+12% [31%HCI]+2% [41%HF]+85.9% ~ 85% water, 100m
3~ 400m
3, connect the small-bore entrance of tee piece, discharge capacity 0.5m
3/ min ~ 3m
3/ min or by design discharge capacity.Maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.
7. just squeeze the solid-state clean retarded acid CArSsa+99.5% water of 0.5% sandstone and break glue, 50m
3~ 400m
3, discharge capacity 0.5m
3/ min ~ 1m
3/ min or by design discharge capacity.
8. just squeeze 20m with 5%KCl liquid
3~ 30m
3prevent other fluids from entering stratum.
9. pressing crack construction must the row's of returning raffinate in 2 hours ~ 8 hours after completing.Must in 10 hours opening well and making production.
According to concrete reservoir conditions and execution conditions adjustment construction sequence, construction liquid, construction liquid measure.
Example 4. dense carbonate oil gas water well builds the nanometer fracturing technique of nano-pore seam.Design pressure break total amount 300m
3~ 2000m
3.
1. well-flushing, with the spontaneous clean solid-state clean retarded acid CArSca+99% water of potential sour CAPca+0.5% carbonate rock of 0.5% carbonate formation, liquid measure 20m
3~ 30m
3the positive well-flushing of huge discharge.
2. just squeezing 1% carbonate rock clean dissolving fracturing fluid CFsca+99% water, 50m
3~ 200m
3, inject discharge capacity: 0.5m
3/ min ~ 6m
3/ min.First small displacement 0.5 ~ 1m
3/ min injects, and progressively improve discharge capacity, maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.
3. just squeeze 1% carbonate rock liquid cleaning retarded acid CArLca+99% water 50m
3~ 100m
3, inject discharge capacity: 0.5m
3/ min ~ 6m
3/ min.Maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.
4. just squeezing the spontaneous clean solid-state clean retarded acid CArSca+99% water 100m of potential sour CAPca+0.5% carbonate rock of 0.5% carbonate formation
3~ 400m
3, inject discharge capacity: 0.5m
3/ min ~ 6m
3/ min.Maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.
5. just squeeze 0.1% ~ 1% carbonate rock acidic group viscoplasticity cleaning foam fracturing fluid VCFaca+12% [31%HCI]+2% [41%HF]+85.9% ~ 85% water, 100m
3~ 400m
3, inject discharge capacity: 0.5m
3/ min ~ 6m
3/ min.Maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.
6. add sand with tee piece and add matrix acidizing.Tee piece two entrances, an inlet calibre is large, and an inlet calibre is little, an outlet.The outlet of tee piece connects well head.1% carbonate rock acidic group viscoplasticity cleaning foam fracturing fluid VCFaca+99% water, 300m
3~ 500m
3, press working design sand than mulling by fracturing blender truck, connect the heavy caliber entrance of tee piece, discharge capacity 4m
3/ min ~ 8m
3/ min or by design discharge capacity.0.1% ~ 1% carbonate rock acidic group viscoplasticity cleaning foam fracturing fluid VCFaca+12% [31%HCI]+2% [41%HF]+85.9% ~ 85% water, 100m
3~ 400m
3, connect the small-bore entrance of tee piece, discharge capacity 0.5m
3/ min ~ 3m
3/ min or by design discharge capacity.Maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.
7. just squeeze the solid-state clean retarded acid CArSca+99.5% water of 0.5% carbonate rock and break glue, 50m
3~ 400m
3, discharge capacity 0.5m
3/ min ~ 1m
3/ min or by design discharge capacity.
8. just squeeze 20m with 5%KCl liquid
3~ 30m
3prevent other fluids from entering stratum.
9. pressing crack construction must the row's of returning raffinate in 2 hours ~ 8 hours after completing.Must in 10 hours opening well and making production.
According to concrete reservoir conditions and execution conditions adjustment construction sequence, construction liquid, construction liquid measure.
Example 5. builds the fracturing technique of the hot dry rock exploitation artificial storage fluid layer based on nano-pore seam.Design pressure break total amount 300m
3~ 2000m
3.
1. well-flushing, with the spontaneous clean solid-state clean retarded acid CArSgr+99% water of potential sour CAPgr+0.5% granite of 0.5% granitic formation, liquid measure 20m
3~ 30m
3the positive well-flushing of huge discharge.
2. just squeezing 1% granite clean dissolving fracturing fluid CFsgr+99% water, 50m
3~ 200m
3, inject discharge capacity: 0.5m
3/ min ~ 6m
3/ min.First small displacement 0.5 ~ 1m
3/ min injects, and progressively improve discharge capacity, maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.
3. just squeeze 1% granite liquid cleaning retarded acid CArLgr+99% water 50m
3~ 100m
3, inject discharge capacity: 0.5m
3/ min ~ 6m
3/ min.Maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.
4. just squeezing the spontaneous clean solid-state clean retarded acid CArSgr+99% water 100m of potential sour CAPgr+0.5% granite of 0.5% granitic formation
3~ 400m
3, inject discharge capacity: 0.5m
3/ min ~ 6m
3/ min.Maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.
5. just squeeze 0.1% ~ 1% granite acidic group viscoplasticity cleaning foam fracturing fluid VCFagr+12% [31%HCI]+2% [41%HF]+85.9% ~ 85% water, 100m
3~ 400m
3, inject discharge capacity: 0.5m
3/ min ~ 6m
3/ min.Maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.
6. add sand with tee piece and add matrix acidizing.Tee piece two entrances, an inlet calibre is large, and an inlet calibre is little, an outlet.The outlet of tee piece connects well head.1% granite acidic group viscoplasticity cleaning foam fracturing fluid VCFagr+99% water, 300m
3~ 500m
3, press working design sand than mulling by fracturing blender truck, connect the heavy caliber entrance of tee piece, discharge capacity 4m
3/ min ~ 8m
3/ min or by design discharge capacity.0.1% ~ 1% granite acidic group viscoplasticity cleaning foam fracturing fluid VCFagr+12% [31%HCI]+2% [41%HF]+85.9% ~ 85% water, 100m
3~ 400m
3, connect the small-bore entrance of tee piece, discharge capacity 0.5m
3/ min ~ 3m
3/ min or by design discharge capacity.Maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.
7. just squeeze the solid-state clean retarded acid CArSgr+99.5% water of 0.5% granite and break glue, 50m
3~ 400m
3, discharge capacity 0.5m
3/ min ~ 1m
3/ min or by design discharge capacity.
8. just squeeze 20m with 5%KCl liquid
3~ 30m
3prevent other fluids from entering stratum.
9. pressing crack construction must the row's of returning raffinate in 2 hours ~ 8 hours after completing.Must in 10 hours opening well and making production.
According to concrete reservoir conditions and execution conditions adjustment construction sequence, construction liquid, construction liquid measure.
Claims (10)
1. improve the nanometer fracturing technique of desorption rate, it is characterized in that adopting clean dissolving fracturing fluid CFs, acidic group viscoplasticity cleaning foam fracturing fluid VCFa, stratum self-generating cleans potential sour CAP, liquid cleaning retarded acid CArL, solid-state clean retarded acid CArS carries out well-flushing, preposition pressure break, clean retarded acid pressure break, potential matrix acidizing, take sand pressure break, broken glue, the fracturing technologies such as the row of returning, link up, expand nano-pore seam, build nanoscale, micron order, grade, the volume map cracking of Centimeter Level, improve desorption rate simultaneously, diffusion velocity and seepage velocity, make adsorbed gas (coal bed gas, shale gas), adsorbed oil (shale oil), fine and close oil gas energy industrialization exploitation, the industrialization of hot dry rock heat energy energy is generated electricity.
Configure No. 1, No. 2, No. 3, No. 4, No. 5, No. 6, No. 7 liquid.Liquid measure is determined by working design, total amount 300m
3~ 2000m
3.
No. 1 liquid: 0.5% ~ 1% clean dissolving fracturing fluid CFs+99% water, uses the circulation of fracturing blender truck, huge discharge water pumper, huge discharge pump truck or liquid distributing vehicle to stir evenly for 15 ~ 20 minutes.Liquid measure accounts for about 1/5 of total amount.Declare patent: the clean dissolving pressure break liquid making method dissolving petrographic formation nano-pore seam
No. 2 liquid: acidproof configuration of storage tanks 1% liquid cleaning retarded acid CArL+99% water, use the circulation of huge discharge water pumper, huge discharge pump truck or liquid distributing vehicle to stir evenly for 15 ~ 20 minutes.Liquid measure accounts for about 1/5 of total amount.Declare patent: the clean retarded acid compound method of rock nano-pore seam do not built by replace tubes post.
No. 3 liquid: acidproof configuration of storage tanks 0.5% stratum self-generating cleans the solid-state clean retarded acid CArS+99% water of potential sour CAP+0.5%, use the circulation of huge discharge water pumper, huge discharge pump truck or liquid distributing vehicle to stir evenly for 15 ~ 20 minutes.Liquid measure accounts for about 1/5 of total amount.Declare patent: the stratum self-generating building nano-pore seam cleans potential sour compound method.
No. 4 liquid: acidproof configuration of storage tanks 0.1% ~ 1% acidic group viscoplasticity cleaning foam fracturing fluid VCFa+12% [31%HCl]+2% [41%HF]+85.9% ~ 85% water, use huge discharge water pumper, huge discharge pump truck or liquid distributing vehicle to circulate and stir evenly for 20 minutes.Liquid measure accounts for about 1/5 of total amount.Declare patent: the acidic group viscoplasticity cleaning foam fracturing fluid compound method of building nano-pore seam.
No. 5 liquid: 1% acidic group viscoplasticity cleaning foam fracturing fluid VCFa+99% water, use huge discharge water pumper, huge discharge pump truck or liquid distributing vehicle to circulate and stir evenly for 20 minutes.Liquid measure accounts for about 1/5 of total amount.Proppant is prepared by design.
No. 6 liquid: the solid-state clean retarded acid CArS+99.5% water of acidproof configuration of storage tanks 0.5%, use fracturing blender truck, huge discharge water pumper, huge discharge pump truck or liquid distributing vehicle to circulate and stir evenly for 20 minutes.Liquid measure 50m
3~ 200m
3.
No. 7 liquid: 5% ~ 15%KCl, 20m3 ~ 30m3, by 1.1 times of preparations of wellbore volume.Clay content is higher, and KCl consumption is larger.The best 15%KCl of shale.
2., according to described in claim 1, it is characterized in that first step well-flushing, use 20m
3~ 30m
3no. 3 positive well-flushings of liquid huge discharge.0.5% stratum self-generating cleans the stolen goods thing such as oil, mud, sandstone, Ca, Mg and Fe dirt in the solid-state clean retarded acid CArS wash oil well pit shaft of potential sour CAP+0.5%.Return and drain washing well raffinate.
3., according to described in claim 1-2, it is characterized in that second step is just squeezing preposition clean dissolving fracturing fluid CFs (1% clean dissolving fracturing fluid CFs), inject No. 1 liquid by the amount of working design, inject discharge capacity: 0.5m
3/ min-6m
3/ min.First small displacement 0.5-1m
3/ min injects, and progressively improve discharge capacity, maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.The clean fracturing fluid that dissolves can dissolve cement in nano-pore seam and wall, and the cement in the nano-pore seam utilizing the time official post of dissolving to clean to dissolve fracturing fluid to flow through and wall, form the nano-seam net of first phase guide.
4., according to described in claim 1-3, it is characterized in that the 3rd step just squeezes the slow acid solution of liquid cleaning (1% liquid cleaning retarded acid), inject No. 2 liquid by the amount of working design, inject discharge capacity: 0.5m
3/ min-6m
3/ min.First small displacement 0.5-1m
3/ min injects, and progressively improve discharge capacity, maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.The slow acid solution of liquid cleaning, along first-phase nano-seam net, expands and extends first-phase nano-seam net, forms second phase nanometer, micron seam net.
5. according to described in claim 1-4, it is characterized in that the 4th step is just squeezing preposition solid-state clean retarded acid, solid-state clean potential acid solution (0.5% stratum self-generating cleans the solid-state clean retarded acid CArS of potential sour CAP+0.5%), inject No. 3 liquid by the amount of working design, inject discharge capacity: 0.5m
3/ min-6m
3/ min.Maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.0.5% stratum self-generating cleans nano-seam net, the micron seam net of the solid-state clean retarded acid CArS of potential sour CAP+0.5% along the second phase, expands further and extends nanometer, the micron seam net of the second phase, forming third phase nanometer, micron stitches net.
6. according to described in claim 1-5, it is characterized in that the 5th step just squeezes hydrochloric acid clean retarded acid (0.1% ~ 1% acidic group viscoplasticity cleaning foam fracturing fluid VCFa+12% [31%HCl]+2% [41%HF]), inject No. 4 liquid by the amount of working design, inject discharge capacity: 0.5m
3/ min-6m
3/ min.Maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.0.1% ~ 1% acidic group viscoplasticity cleaning foam fracturing fluid VCFa+12% [31%HCl]+2% [41%HF] is along nano-seam net, the micron seam net of the third phase, expand further again and extend nanometer, the micron seam net of the third phase, forming fourth phase nanometer, micron, millimeter stitch net.
7., according to described in claim 1-6, it is characterized in that the 6th step tee piece adds sand and adds matrix acidizing.Sand proportion adopts low sand ratio, progressively increases progressively sand proportion.Sand proportion is as table 1.
Table 1 pressing crack construction sand proportion
Tee piece two entrances (inlet calibre is large, and an inlet calibre is little), an outlet.The outlet of tee piece connects well head.No. 5 liquid (1% acidic group viscoplasticity cleaning foam fracturing fluid VCFa) press working design sand than mulling by fracturing blender truck, connect the heavy caliber entrance of tee piece, discharge capacity 4m
3/ min ~ 8m
3/ min or by design discharge capacity.No. 4 liquid (0.1% ~ 1% acidic group viscoplasticity cleaning foam fracturing fluid VCFa acid solution+12% [31%HCl]+2% [41%HF]) connect the small-bore entrance of tee piece, discharge capacity 0.5m
3/ min ~ 3m
3/ min or by design discharge capacity.Maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.Add sand and add nano-seam net, the micron seam net of matrix acidizing along the fourth phase, then expands further and extend the nanometer of the fourth phase, micron, millimeter stitch net, builds nanoscale, micron order, grade, Centimeter Level large regions volume fracture network on this basis.
8., according to described in claim 1-7, it is characterized in that must taking to keep nanometer pressure break to improve the measure of desorption rate.These measures are broken glue, 5%KCl ~ 15%KC (clay mineral content high, shale 15%KC) liquid replaces, immediately the row's of returning raffinate, producing well produce immediately, water injection well water filling immediately.
Broken glue: just crowded with No. 6 liquid, discharge capacity 0.5m
3/ min ~ 1m
3/ min or by design discharge capacity.Formation temperature breaks glue and 0.5% solid-state clean retarded acid CArS accelerates broken glue, makes raffinate without residue or low level of residue.
Replace: just squeeze 20m with 5%KCl ~ 15%KCl liquid
3~ 30m
3, prevent other fluids from entering formation contaminant reservoir.
The row's of returning raffinate immediately: must the row's of returning raffinate immediately in 2 hours ~ 8 hours after pressing crack construction completes.Row's raffinate makes residue discharge pit shaft and does not block reservoir.
Produce immediately: producing well must start to produce in 10 hours.Water injection well must start water filling in 10 hours.Production makes fluid flow, and keeps terrane stress, prevents the closing up of cracks that the high-strength stress of rock causes, and retaining hole seam is unblocked.
9., according to described in claim 1-8, it is characterized in that being construction sequence, construction liquid, construction liquid measure, adjust according to reservoir conditions and execution conditions, make pressing crack construction be more suitable for reservoir conditions and execution conditions, ensure the long-lasting of pressing crack construction.
10., according to described in claim 1-9, it is characterized in that all well in developing zone all must carry out overall nanometer pressure break, simultaneously overall collection and arrange in a row and adopt, form developing zone overall volume desorb, improve overall volume desorption rate completely.
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