CN102757778B - Fracturing fluid capable of resisting high salinity water quality - Google Patents
Fracturing fluid capable of resisting high salinity water quality Download PDFInfo
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Abstract
The invention relates to a fracturing fluid capable of resisting high salinity water quality. The fracturing fluid is characterized by being composed of a base fluid and a cross-linking fluid which are fully mixed in proportion. The base fluid contains a chelate cosolvent and a chelate stabilizer, wherein the chelate cosolvent can restrain high salinity of water quality and promote swelling of guanidine gum. The base fluid comprises 98.2-98.65 parts of high salinity surface water, 0.1-0.15 part of the chelate cosolvent,0.3-0.4 part of thickener, 0.1-0.15 part of bactericide, 0.3-0.5 part of clay stabilizer, 0.5 part of demulsifying cleanup agent and 0.05-0.1 part of the chelate stabilizer; the cross-linking fluid comprises 50 parts of water, 50 parts of organic cross-linking agents and 0.35 part of gel breaker; and the fracturing fluid comprises 99.2-99.5 parts of the base fluid and 0.5-0.8 part of the cross-linking fluid. By aid of the fracturing fluid, water resources can be saved effectively, and the success rate for fracturing construction can be improved.
Description
Technical field
The present invention relates to a kind of fracturing liquid, particularly a kind of anti-high-salinity water quality fracturing liquid for oil field compression fracture construction.Belong to hydrocarbon zone exploitation field.
Background technology
In the prior art, the fracturing liquid using in oil-gas field fracturing transformation process is mainly take water-base gel fracturing fluid as main.There is following inadaptability in Ji's plateau area conventional fracturing liquid formula used:
(1) at present the on-the-spot water-base gel fracturing fluid using is mainly that vegetable jelly is, pH value, salinity, foreign matter content, turbidity, the bacterium of dosing water quality are had to strict requirement, otherwise can not dosing, or causes fracturing liquid degraded, rotten, corrupt;
(2) be slightly acidic from the construction water of Ji's plateau area collection in worksite, color is turned to be yellow slightly.With water source point the guanidine glue swelling rate of standby water sample configuration very slow, and there is the phenomenon of layering and precipitating.After the standing 4h of guanidine matrix liquid, at the bottom of tank, occur that precipitation condenses into bulk, and tank deck viscosity grade is low.Base fluid, at the frozen glue toughness extreme difference that adds organic borate cross-linker to be cross-linked to form, can not hang.Frozen glue very easily dewaters and becomes fragile, and takes grittiness energy and high temperature resistant property also very weak.
(3) by finding out the assay of water sample, experiment 6 water samples of getting are compared with process water, solid content exceeds 8.5 times of left and right, salinity reaches the more than 9 times of service water salinity, wherein the highest with 195-34 wellblock, ground surface water salinity, reach 277.63 milligramequivalents/L, this just becomes the important factor that affects guanidine matrix fluidity energy.The frozen glue that the base fluid of service water preparation forms is sheared after 60min, more than viscosity remains on 100mpas continuously at 70 ℃; And the frozen glue that ground 195-34 wellblock surface water water forms is under the continuous shearing of rheometer, after 7min, reduced viscosity, to 50mpas, can not meet site operation requirement.Add pressure break chelating solubility promoter CSO-1 and pressure break chelating solubility promoter CST-1 anti-shear performance to improve.
Summary of the invention
Object of the present invention provides a kind of anti-high-salinity water quality fracturing liquid, can suppress water quality high salinity, promote glue swelling chelating solubility promoter and chelate stabilizer, forms a kind of new fracturing fluid system, reaching water saving, improve and be constructed into power object.
For achieving the above object, the technical solution used in the present invention is:
A kind of anti-high-salinity water quality fracturing liquid, is characterized in that: fracturing liquid suppresses water quality high salinity by containing, promote the base fluid of chelating solubility promoter that guanidine peptization is swollen and chelate stabilizer and crosslinked fluid forms and base fluid and crosslinked fluid are fully mixed in proportion;
Its technological process is:
(1) preparation of base fluid:
The proportioning of base fluid:
98.2～98.65 parts of high salinity surface water, 0.1～0.15 part of chelating solubility promoter, 0.3～0.4 part of thickening material, 0.1～0.15 part, sterilant, clay stabilizer 0.3-0.5 part, 0.5 part of breakdown of emulsion cleanup additive, 0.05～0.1 part of chelate stabilizer;
Blending process process is: in the situation that stirring with pump circulation or agitator, to the chelating solubility promoter, sterilant, thickening material, clay stabilizer, breakdown of emulsion cleanup additive and the chelate stabilizer that successively slowly add above-mentioned mass parts in above-mentioned mass parts high salinity surface water, continue circulation or stir 30 minutes, so that liquid mixing is abundant, thickening material is fully swelling, forms uniform liquid;
(2) preparation of crosslinked fluid:
The proportioning of crosslinked fluid: 50 parts, water, 50 parts of organic crosslinking agents, 0.35 part of gel breaker;
Blending process process is: by even by the abundant mixed cycle of above-mentioned mass parts to water and linking agent;
(3) of the fracturing fluid preparation:
Of the fracturing fluid proportioning: 99.2～99.5 parts of base fluids, crosslinked fluid 0.5-0.8 part;
Blending process process is: under the condition stirring, base fluid and crosslinked fluid are fully mixed by above-mentioned mass parts, to form full-bodied liquid.
Described thickening material is the derivative of natural plant guanidine glue, i.e. hydroxypropyl guar HPG, and its molecular structural formula is as follows:
Described chelating solubility promoter is the mixture of poly-phosphate and ethylenediamine tetraacetic acid (EDTA).
Described sterilant is nonionic non-oxidative bactericide.
Described clay stabilizer is the long-acting low injury type clay stabilizer of organic low molecular class, and molecular weight is at 300-800.
Described breakdown of emulsion cleanup additive is the composite reactive systems forming of nonionogenic tenside, can keep the wetting ability of rock, prevents from abolishing the milk sap of fracturing fluid and crude oil formation.
Described chelate stabilizer is organic bases or mineral alkali, and described organic bases is one or both mixture of trolamine, thanomin, and described mineral alkali is sodium hydroxide.
Described organic crosslinking agent is that vegetable jelly is crosslinked with organic chelated highly enriched linking agent, is cross-linked 0.5-2min time of lag, temperature resistant capability >=70 ℃, and cross-linking properties is good, the linking agent of lower concentration viscosifying agent.
Described gel breaker is any one in ammonium persulphate, Potassium Persulphate, hydrogen peroxide, benzoyl peroxide; Except adding according to quantity in linking agent, the variation of formation temperature during also according to pressure break, manually on truck-mounted blender, wedge shape adds.
Described chelating solubility promoter is chelating solubility promoter CSO-1, thickening material is guanidine glue CJ2-6, sterilant is sterilant CJSJ-2, clay stabilizer is clay stabilizer COP-1, chelate stabilizer is that chelate stabilizer CST-1, breakdown of emulsion cleanup additive are breakdown of emulsion cleanup additive CF-5D, organic crosslinking agent is that linking agent JL-2, gel breaker are gel breaker APS, the above-mentioned trade name that is.On above-mentioned raw materials market, all there is sale.
The invention has the beneficial effects as follows: the organic crosslinking agent that 1) the present invention adopts is that vegetable jelly is crosslinked with organic chelated highly enriched linking agent, there is crosslinked wide ranges, consumption is little, cross crosslinked not bleed, not embrittlement of low temperature frozen glue, aquation is thorough, and low temperature does not return glue, frozen glue temperature resistance shear resistant is strong, take grittiness and can wait well feature, be cross-linked 0.5-2min time of lag, temperature resistant capability is greater than 70 ℃.
2) when chelating solubility promoter dosage is 0.05%-0.15%, it is effective that guanidine peptization is swollen, and when chelate stabilizer dosage is 0.05～0.1%, cross-linking properties is good, can meet the needs of site operation.
3) water-soluble rear ionization of chelating solubility promoter, generates the molecular chain of electronegative property, and it and Ca2+, Mg2+ plasma form water-soluble complex compound or inner complex, thereby inorganic salt solubleness is increased, and plays hydrotropy scale effect.
4) the crosslinked guanidine glue forming after formula adjustment is at 70 ℃ of down cut 45min, more than last viscosity all remains on 100mpas.This fracturing liquid formula has good heatproof anti-shear performance, and laboratory and test in place all have good prop-carrying capacity (according to the requirement of industry standard, reaching 50mpas in viscosity can meet).
5) add chelating solubility promoter and chelate stabilizer, make this fracturing fluid system have that good shear resistant, thermostability, water-insoluble and residue content are low, to control strong, the broken glue of filtration capacity thorough in time, less to reservoir damage, comparatively adapt to this reservoir.
6) of the fracturing fluid preparation can not used life fresh water, uses local high salinity surface water, can saving water resource and the energy, effectively protection of the environment.
7) this fracturing liquid is suitable for the pressing crack construction in the poor low-permeability oil gas field of surface water quality condition, improves of the fracturing fluid performance, improves pressing crack construction success ratio.The recovery ratio that improves Oil/gas Well, has good economic benefit and wide application prospect.
Accompanying drawing explanation
Below in conjunction with embodiment and Figure of description, the present invention is described in further detail, but not as a limitation of the invention.
Fig. 1 is the long 8 layers of epimere construction curve of the ground 195-34 well of embodiment 5;
Fig. 2 is the long 8 layers of hypomere hydraulic fracture operating curve of the ground 195-34 well of embodiment 5.
Embodiment
A kind of anti-high-salinity water quality fracturing liquid, is characterized in that: fracturing liquid suppresses water quality high salinity by containing, promote the base fluid of chelating solubility promoter that guanidine peptization is swollen and chelate stabilizer and crosslinked fluid forms and base fluid and crosslinked fluid are fully mixed in proportion;
Its technological process is:
(1) preparation of base fluid:
The proportioning of base fluid:
98.2～98.65 parts of high salinity surface water, 0.1～0.15 part of chelating solubility promoter, 0.3～0.4 part of thickening material, 0.1～0.15 part, sterilant, clay stabilizer 0.3-0.5 part, 0.5 part of breakdown of emulsion cleanup additive, 0.05～0.1 part of chelate stabilizer;
Blending process process is: in the situation that stirring with pump circulation or agitator, to the chelating solubility promoter, sterilant, thickening material, clay stabilizer, breakdown of emulsion cleanup additive and the chelate stabilizer that successively slowly add above-mentioned mass parts in the high salinity surface water of above-mentioned mass parts, continue circulation or stir 30 minutes, so that liquid mixing is abundant, thickening material is fully swelling, forms uniform liquid;
(2) preparation of crosslinked fluid:
The proportioning of crosslinked fluid: 50 parts, water, 50 parts of organic crosslinking agents, 0.35 part of gel breaker;
Blending process process is: by even by the abundant mixed cycle of above-mentioned mass parts to water and crosslinked fluid,
(3) of the fracturing fluid preparation:
Of the fracturing fluid proportioning: 99.2～99.5 parts of base fluids, crosslinked fluid 0.5-0.8 part;
Blending process process is: under the condition stirring, base fluid and crosslinked fluid are fully mixed by above-mentioned mass parts, to form full-bodied liquid.
Embodiment 1(buried depth of strata≤1700m)
(1) preparation of base fluid:
The proportioning of base fluid:
High salinity surface water 98.65kg, chelating solubility promoter 0.1kg, thickening material 0.3kg, sterilant 0.1kg, clay stabilizer 0.3kg, breakdown of emulsion cleanup additive 0.5kg, chelate stabilizer 0.05kg;
Blending process process is: in the situation that stirring with pump circulation or agitator, to the chelating solubility promoter, sterilant, thickening material, clay stabilizer, breakdown of emulsion cleanup additive and the chelate stabilizer that successively slowly add above-mentioned mass parts in the high salinity surface water of above-mentioned mass parts, continue circulation or stir 30 minutes, so that liquid mixing is abundant, thickening material is fully swelling, forms uniform liquid;
(2) preparation of crosslinked fluid:
The proportioning of crosslinked fluid: water 50kg, organic crosslinking agent 50kg, gel breaker 0.35kg;
Blending process process is: by even by the abundant mixed cycle of above-mentioned quality to water and linking agent,
(3) of the fracturing fluid preparation:
Of the fracturing fluid proportioning: get above-mentioned base fluid 99.2kg, crosslinked fluid 0.5kg;
Blending process process is: under the condition stirring, base fluid and crosslinked fluid are fully mixed by above-mentioned quality, to form full-bodied liquid.
Embodiment 2(buried depth of strata >=2700m)
Basic identical with embodiment 1, difference is: the proportioning of base fluid: high salinity surface water 98.2kg, chelating solubility promoter 0.15kg, thickening material 0.4kg, sterilant 0.15kg, clay stabilizer 0.5kg, breakdown of emulsion cleanup additive 0.5kg, chelate stabilizer 0.1kg;
The proportioning of crosslinked fluid: water 50kg, organic crosslinking agent 50kg, gel breaker 0.35kg;
Of the fracturing fluid proportioning: base fluid 99.5kg, crosslinked fluid 0.8kg.
Embodiment 3(1700m≤buried depth of strata≤2200m)
Basic identical with embodiment 1, difference is: the proportioning of base fluid: high salinity surface water 98.3kg, chelating solubility promoter 0.15kg, thickening material 0.35kg, sterilant 0.10kg, clay stabilizer 0.5kg, 0.5 part of breakdown of emulsion cleanup additive, chelate stabilizer 0.1kg;
The proportioning of crosslinked fluid: water 50kg, organic crosslinking agent 50kg, gel breaker 0.35kg;
Of the fracturing fluid proportioning: base fluid 99.3kg, crosslinked fluid 0.6kg;
Embodiment 4
Basic identical with embodiment 1, difference is: described thickening material is the derivative of natural plant guanidine glue, i.e. hydroxypropyl guar HPG, and its molecular structural formula is as follows: (its molecular weight is at 20-30 ten thousand)
HPG molecular structure
Described chelating solubility promoter is the mixture of poly-phosphate and ethylenediamine tetraacetic acid (EDTA), ethylenediamine tetraacetic acid (EDTA) ethylenediaminetetraacetic acid, and this chelating solubility promoter has the high salinity, the swollen effect of promotion guanidine peptization that suppress water quality.Described sterilant is nonionic non-oxidative bactericide, has the features such as efficient, wide spectrum, low toxicity, compatibleness are good.Described clay stabilizer is the long-acting low injury type clay stabilizer of organic low molecular class, and it has high-affinity to surface of clay, has overcome the feature of macromolecule positively charged ion obstruction pore throat, and hole injury is little, and preventive effect of expansion is obvious.Described breakdown of emulsion cleanup additive is the composite reactive systems forming of nonionogenic tenside, overcome the absorption of cationic cleanup additive and reduced the shortcoming of its effective concentration, during whole discharge opeing, the row of helping acts on obviously, can prevent the change of rock wettability simultaneously and prevent, abolishes fracturing fluid and crude oil formation milk sap.Described chelate stabilizer is organic bases or mineral alkali, and described organic bases is one or both the mixture in trolamine, thanomin, and described mineral alkali is sodium hydroxide, selects trolamine here.Described organic crosslinking agent is that vegetable jelly is crosslinked with organic chelated highly enriched linking agent, there is crosslinked wide ranges, consumption is little, cross crosslinked not bleed, not embrittlement of low temperature frozen glue, aquation is thorough, and low temperature does not return glue, frozen glue temperature resistance shear resistant is strong, take grittiness and can wait well feature, be cross-linked 0.5-2min time of lag, temperature resistant capability is greater than 70 ℃.Described gel breaker is any one in ammonium persulphate, Potassium Persulphate, hydrogen peroxide, benzoyl peroxide, selects ammonium persulphate here.
Embodiment 5
1, on-the-spot dosing
The chelating solubility promoter CSO-1 of 0.15kg is added to the 10min that circulates in the high salinity surface water of 98.35kg, after mixing in tank, chelating solubility promoter CSO-1 adds successively the guanidine glue CJ2-6 of 0.4kg by formula order according to conventional fracturing liquid compound method, the sterilant CJSJ-2 of 0.15kg, the clay stabilizer COP-1 of 0.5kg, after the breakdown of emulsion cleanup additive CF-5D of the chelate stabilizer CST-1 of 0.1kg and 0.5kg, circulate about 10min, obtained performance detection data table as shown in the table.Guanidine matrix liquid is in the large tank guanidine matrix liquid configuring, and the base fluid viscosity that tank deck and pot bottom divide is between 36-48mpas, and pH value, between 8.5-9, is evenly distributed, and leaves standstill without layering and precipitating phenomenon, meets construction requirement completely.Linking agent is blended in a 2m uniformly by the water of linking agent JL-2, the 50kg of 50kg and the gel breaker APS of 0.35kg
3pond in, when construction, squeeze into truck-mounted blender by being cross-linked pump.Under the condition stirring, 99.5kg base fluid and 0.5kg crosslinked fluid are fully mixed, to form full-bodied liquid.Above-mentioned raw materials purchased from producer with embodiment 1.195-34 wellblock, ground on-the-spot fracturing liquid performance detection data table (after dosing, 2h detects) is in table 1
(table 1)
2, pressure break situation
In pressing crack construction process crosslinked beguine to be controlled at 100:0.5-0.8(ground 195-34 well according to field condition crosslinked than being 100:0.6) in scope.In whole construction process, guanidine matrix liquid is can both be on truck-mounted blender well crosslinked, the frozen glue toughness after crosslinked and take grittiness can be all fine, can under different sand concentration, hang.The long 8 layers of epimere construction results of ground 195-34 well: formation-parting pressure 29.2MPa, adds 20/40 order low-density ceramsite 35m
3, discharge capacity 2.408m
3/ min, operating pressure 28.4Mpa left and right, sand is than 33.6%, and ground 195-34 well is grown 8 layers of hypomere construction results: the broken 33.9Mpa that presses in stratum, adds 20/40 order low-density ceramsite 35m
3, discharge capacity, 2.404m
3/ min operating pressure 24.8MPa left and right, sand is than 33.7%.Twice construction all requires steadily to promote sand ratio according to working design, and whole fracturing process is very well.(seeing shown in Fig. 1 and Fig. 2)
3, broken glue situation
81.2 ℃ of Ji's plateau ground head of district average buried depth 2685m of 8 reservoir left and right, temperature.System after improving has obtained good effect in construction process.Aspect broken glue, except adding in linking agent hydrated agent by design, in the time that being also left about 30 minutes, pressure break add hydrated agent to guarantee brokenly glue according to 0.01%～0.03%～0.05%～0.07%～0.09% ratio wedge shape.195-34 well long 8 two-layer pressure breaks in ground add hydrated agent 112Kg, and artificial wedge shape adds hydrated agent 28Kg on truck-mounted blender, returns the viscosity of discharge opeing in the time of 30 ℃ and is all controlled at below 10mpas, meets the related standards of complete fracturing liquid rubber-breaking.This well, through examination row, is produced pure oily 18.36m daily
3/ d, has obtained good construction effect.
Meanwhile, the present invention is to the fracturing liquid of above-described embodiment 1-4 also as the effect analysis of the fracturing liquid Performance Detection of embodiment 5, pressure break situation, broken glue situation, and its result is substantially consistent with the effect of embodiment 5.
Above-mentioned chelating solubility promoter is chelating solubility promoter CSO-1, thickening material is guanidine glue CJ2-6, sterilant is sterilant CJSJ-2, clay stabilizer is clay stabilizer COP-1, chelate stabilizer is that chelate stabilizer CST-1, breakdown of emulsion cleanup additive are breakdown of emulsion cleanup additive CF-5D, organic crosslinking agent is that linking agent JL-2, gel breaker are gel breaker APS, the above-mentioned trade name that is.
Above-mentioned raw materials is respectively purchased from following unit: producer of Xianyang branch office of Qingyang Changqing Down-hole Oilfield Auxiliaries Co., Ltd., address: Xianyang, Shanxi province city is exposed to the sun seven tunnels, sales department's phone: 02986565388; Shaanxi treasuredization science and technology limited Company, address: No. 38, Chen Cang main road, Baoji, Shaanxi Province, China, home sale and Service Phone :+86-917-28538992853896; Linyi City Jia Geng commerce and trade company limited, address: Linyi City chemistry city B district, Linyi 358, phone: 860,539 3127717, fax: 86 0,539 3127393; Xi'an Sheng Da Chemical trade company limited, address: No. 62, eternally happy road, Xi'an City, Shanxi Province, sales department's contact details, phone: 029-62293991, fax: 029-62293991; Xi'an milky way Raw Materials Company of Chemical Industry, address: the prosperous Chemical market of Northwest China south gate, No. 301, West Road, Daxing, Xi'an, Shaanxi east row No. B-8, phone: 029-84410177, fax: 029-62983765.
The part that the present embodiment does not describe in detail and english abbreviation belong to the common practise of the industry, can search on the net, here not narration one by one.
Claims (2)
1. an anti-high-salinity water quality fracturing liquid, is characterized in that: fracturing liquid suppresses water quality high salinity by containing, promote the base fluid of chelating solubility promoter that guanidine peptization is swollen and chelate stabilizer and crosslinked fluid forms and base fluid and crosslinked fluid are fully mixed in proportion;
Its technological process is:
(1) preparation of base fluid:
The proportioning of base fluid:
High salinity surface water 98.35kg, chelating solubility promoter 0.15kg, thickening material 0.4kg, sterilant 0.15kg, clay stabilizer 0.5kg, breakdown of emulsion cleanup additive 0.5kg, chelate stabilizer 0.1kg;
Blending process process is: in the situation that stirring with pump circulation or agitator, to the chelating solubility promoter, sterilant, thickening material, clay stabilizer, breakdown of emulsion cleanup additive and the chelate stabilizer that successively slowly add above-mentioned mass parts in above-mentioned mass parts high salinity surface water, continue circulation or stir 30 minutes, so that liquid mixing is abundant, thickening material is fully swelling, forms uniform liquid;
(2) preparation of crosslinked fluid:
The proportioning of crosslinked fluid: water 50kg, organic crosslinking agent 50kg, gel breaker 0.35kg;
Blending process process is: by even by the abundant mixed cycle of above-mentioned mass parts to water and linking agent;
(3) of the fracturing fluid preparation:
Of the fracturing fluid proportioning: base fluid 99.5kg, crosslinked fluid 0.5kg;
Blending process process is: under the condition stirring, base fluid and crosslinked fluid are fully mixed by above-mentioned mass parts, to form full-bodied liquid;
Described chelating solubility promoter is chelating solubility promoter CSO-1, thickening material is guanidine glue CJ2-6, sterilant is sterilant CJSJ-2, clay stabilizer is clay stabilizer COP-1, chelate stabilizer is that chelate stabilizer CST-1, breakdown of emulsion cleanup additive are breakdown of emulsion cleanup additive CF-5D, organic crosslinking agent is that linking agent JL-2, gel breaker are gel breaker APS, the above-mentioned trade name that is;
Described gel breaker except adding according to quantity in linking agent, the variation of formation temperature during also according to pressure break, pressure break also remaining 30 minutes time according to 0.01%～0.03%～0.05%～0.07%～0.09% ratio manually on truck-mounted blender wedge shape add.
2. the anti-high-salinity water quality fracturing liquid of one according to claim 1, it is characterized in that: described organic crosslinking agent is that vegetable jelly is crosslinked with organic chelated highly enriched linking agent, is cross-linked 0.5-2min time of lag, temperature resistant capability >=70 ℃, cross-linking properties is good, the linking agent of lower concentration viscosifying agent.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104927830A (en) * | 2015-06-15 | 2015-09-23 | 中国石油集团西部钻探工程有限公司 | Waterproof lock fracturing fluid and preparation method thereof |
| CN104927830B (en) * | 2015-06-15 | 2017-11-24 | 中国石油集团西部钻探工程有限公司 | Waterproof lock fracturing fluid and preparation method thereof |
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