CN110079294A - A kind of high temperature resistant weighted fracture fluid and preparation method thereof - Google Patents
A kind of high temperature resistant weighted fracture fluid and preparation method thereof Download PDFInfo
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- CN110079294A CN110079294A CN201910464347.4A CN201910464347A CN110079294A CN 110079294 A CN110079294 A CN 110079294A CN 201910464347 A CN201910464347 A CN 201910464347A CN 110079294 A CN110079294 A CN 110079294A
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- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B37/00—Preparation of polysaccharides not provided for in groups C08B1/00 - C08B35/00; Derivatives thereof
- C08B37/006—Heteroglycans, i.e. polysaccharides having more than one sugar residue in the main chain in either alternating or less regular sequence; Gellans; Succinoglycans; Arabinogalactans; Tragacanth or gum tragacanth or traganth from Astragalus; Gum Karaya from Sterculia urens; Gum Ghatti from Anogeissus latifolia; Derivatives thereof
- C08B37/0087—Glucomannans or galactomannans; Tara or tara gum, i.e. D-mannose and D-galactose units, e.g. from Cesalpinia spinosa; Tamarind gum, i.e. D-galactose, D-glucose and D-xylose units, e.g. from Tamarindus indica; Gum Arabic, i.e. L-arabinose, L-rhamnose, D-galactose and D-glucuronic acid units, e.g. from Acacia Senegal or Acacia Seyal; Derivatives thereof
- C08B37/0096—Guar, guar gum, guar flour, guaran, i.e. (beta-1,4) linked D-mannose units in the main chain branched with D-galactose units in (alpha-1,6), e.g. from Cyamopsis Tetragonolobus; Derivatives thereof
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- 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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/66—Compositions based on water or polar solvents
- C09K8/68—Compositions based on water or polar solvents containing organic compounds
- C09K8/685—Compositions based on water or polar solvents containing organic compounds containing cross-linking agents
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
- C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
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- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/26—Gel breakers other than bacteria or enzymes
Abstract
The invention discloses a kind of high temperature resistant weighted fracture fluids and preparation method thereof, belong to technical field of oilfield chemistry.The present invention includes: the water of thickening agent 0.15wt%~0.6wt%, 0~0.05wt% of acidic ph modifier, heavy weight additive 10wt%~70wt%, crosslinking agent 0.4wt%~1.0wt%, cleanup additive 0.01wt%~0.2wt%, fungicide 0.01wt%~0.2wt%, temperature stability agent 0.01wt%~2.0wt%, acidity gel breaker 0.1wt%~1.0wt% and surplus.High temperature resistant weighted fracture fluid production of the invention is simple, and site operation rapid preparing may be implemented in Rapid liquid-dissolving, the performance with superior heatproof resistant to shearing.
Description
Technical field
The present invention relates to technical field of oilfield chemistry, and in particular to a kind of high temperature resistant weighted fracture fluid and preparation method thereof.
Background technique
As exploration engineering is constantly progressive, domestic and international major oil field deep well, ultradeep well, high-pressure well and abnormal formation stress well by
It is cumulative plus, for such well since fracture pressure is higher, pressing crack construction generally reaches 90MPa or more, even more than 100MPa, when pressure break
Well head operation pressure is big, can exceed that the upper pressure limit of existing equipment.In order to reduce operation pressure, can be aggravated using fracturing fluid
Measure increases reservoir stress by the pressure at right angle of liquid in pit shaft, improves the success rate of live pressing crack construction.
Currently, existing weighted fracture fluid can no longer meet mining requirement, close with the increasingly increase of exploitation difficulty
Degree, high temperature resistant endurance of cutting can need to be further increased, in addition, existing weighted fracture fluid, which also cannot achieve recycling, repeats benefit
With resulting in waste of resources.
Summary of the invention
The purpose of the present invention is to provide a kind of high temperature resistant weighted fracture fluids and preparation method thereof, to solve existing exacerbation pressure
The problem of density of power liquid is low, high temperature resistant endurance of cutting energy is poor and non-refractory utilizes.
The technical scheme to solve the above technical problems is that
A kind of high temperature resistant weighted fracture fluid, comprising: thickening agent 0.15wt%~0.6wt%, acidic ph modifier 0~
0.05wt%, heavy weight additive 10wt%~70wt%, crosslinking agent 0.4wt%~1.0wt%, cleanup additive 0.01wt%~0.2wt%,
Fungicide 0.01wt%~0.2wt%, temperature stability agent 0.01wt%~2.0wt%, acid gel breaker 0.1wt%~
The water of 1.0wt% and surplus.
Further, in preferred embodiments of the present invention, above-mentioned high temperature resistant weighted fracture fluid includes: thickening agent
0.35wt%~0.55wt%, 0.01~0.04wt% of acidic ph modifier, heavy weight additive 30wt%~60wt%, crosslinking agent
0.5wt%~0.7wt%, cleanup additive 0.05wt%~0.1wt%, fungicide 0.05wt%~0.1wt%, temperature stability agent
The water of 0.05wt%~1.0wt%, acidity gel breaker 0.5wt%~1.0wt% and surplus.
Further, in preferred embodiments of the present invention, above-mentioned high temperature resistant weighted fracture fluid includes: thickening agent
0.35wt%~0.45wt%, 0.02~0.03wt% of acidic ph modifier, heavy weight additive 40wt%~60wt%, crosslinking agent
0.65wt%~0.7wt%, cleanup additive 0.06wt%~0.08wt%, fungicide 0.06wt%~0.08wt%, temperature are stablized
The water of agent 0.06wt%~0.08wt%, acidity gel breaker 0.5wt%~0.7wt% and surplus.
Further, in preferred embodiments of the present invention, above-mentioned thickening agent is modified guanidine collagen powder and modified guanidine rubber powder
One or both of.Further, in preferred embodiments of the present invention, the preparation method of above-mentioned modified guanidine rubber powder includes:
Guanidine glue is mixed with water and keeps the temperature 10min~20min under 40 DEG C~60 DEG C of oil bath, concentration, which is then added, is
Sodium hydroxide solution, propane sultone, the polyethylene glycol that molecular weight is 200~1000 and the second of 0.05mol/L~0.15mol/L
Feed liquid, is cooled to room temperature by the mixed solution and phase transfer catalyst hexadecyltrimethylammonium chloride of alcohol after fully reacting,
Material liquid pH value is adjusted to neutrality, modified guanidine rubber powder is made in crushed after being dried.
The present invention is by being modified guanidine rubber powder, so that modified guanidine rubber powder is than existing guanidine rubber powder with preferably water-soluble
Property and salt tolerance and high temperature resistant cutting performance, because by realizing the change of molecular structure to existing guanidine rubber powder modified,
Final performance is promoted.
In modifying process, alkali is added in the present invention, is applied not only to adjust pH value, more primarily to the hydrogen of substituted hydroxy,
Replace, to activate active site, modified work is allowed to be easier to carry out.It selects polyethylene glycol and ethyl alcohol is molten as mixing
Agent occurs further etherification modified.Modifying agent is propane sultone, not only produced after ring-opening reaction one it is additional
Hydroxyl, there are one sulfonate radicals, and being conducive to modified product has preferably water solubility, while also ensuring more temperature tolerance.
And due to group be all it is negatively charged, it is mutually exclusive, guarantee the stretching, extension of strand under the conditions of high salinity, final performance is very
Good resistance to salinity performance.In addition, the present invention is by improving reaction to the restriction in modifying process to raw material and reaction condition
Speed and modification efficiency and also reduce modified cost.The polyethylene glycol that molecular weight is 200~1000, it is not only cheap,
And there is better dissolubility and catalytic effect, allow subsequent modification to be easier to occur.
Further, in preferred embodiments of the present invention, the preparation method of above-mentioned modified guanidine collagen powder includes: by epoxy
The mixed solution of chloropropane and propane sultone is sprayed at the surface of guanidine collagen powder, dries after mixing evenly；Wherein, epoxy chloropropionate
The volume ratio of alkane and propane sultone is (6-8): (2-4).
Using guanidine glue as thickening agent, it is extracted from plants, it is environmentally protective, there is preferably thickening and anti-shearing effect
Fruit, and viscosity is low, easy pumping, and sexual valence is relatively high.Guanidine xanthan molecule chain occurs by being modified to guanidine collagen powder in the present invention
Change, to promote the performance of product, finally shows extraordinary heat resistance and resistance to superelevation salinity performance.And point
Subchain introduces some band point groups, mutually exclusive and can guarantee long chain-unfolding, therefore resistance to salinity performance is brilliant.The present invention will
Epoxychloropropane and propane sultone are modified guanidine collagen powder, which, which all has, is easy to happen function derived from open loop
Effect, is sprayed on surface, can allow guanidine peptization being modified in an instant in water.And in the volume of epoxychloropropane and propane sultone
Than for (6-8): the optimal modified effect after under the proportion of (2-4).
Further, in preferred embodiments of the present invention, above-mentioned acidic ph modifier include formic acid, acetic acid, citric acid,
The mixture of one or more of hydrochloric acid and lactic acid；Heavy weight additive includes one of alkali halide and alkali metal formate
Or two kinds；Acid gel breaker includes one of formic acid, hydrochloric acid and nitric acid or a variety of.
Above-mentioned alkali halide can be potassium chloride or sodium chloride.Alkali metal formate can be potassium formate or formic acid
Sodium.
Further, in preferred embodiments of the present invention, above-mentioned crosslinking agent includes: borax 15wt%~30wt%, sweet
Oily 5wt%~20wt%, mannitol 5wt%~20wt%, triethanolamine 15wt%~30wt% and sodium hydroxide solution 0~
20wt%.
Crosslinking agent of the invention passes through the borax of aforementioned proportion, glycerol, mannitol, triethanolamine and sodium hydroxide is molten
It is blended in synthesize at 60 DEG C~80 DEG C and obtain.Sodium hydroxide solution is conventionally formulated, concentration 0.1mol/L
~1mol/L.
Further, in preferred embodiments of the present invention, the density of above-mentioned high temperature resistant weighted fracture fluid is 1.10g/cm3
~1.40g/cm3。
The preparation method of above-mentioned high temperature resistant weighted fracture fluid, comprising:
(1) heavy weight additive is added into water, adjusts pH value of solution to 6-8 with acidic ph modifier, thickening agent is then added and stirs
It mixes, fungicide, cleanup additive, temperature stability agent, acidic ph modifier and acid gel breaker is added after thickening agent aquation is complete and stirs
It mixes, obtains fracturing fluid base fluid；
(2) crosslinking agent mixing is added into fracturing fluid base fluid, high temperature resistant weighted fracture fluid is made.
The invention has the following advantages:
High temperature resistant weighted fracture fluid density of the invention has biggish increase, and temperature and shearing sustainability is superior, meets scene
Construction requirement.Using heavy weight additive aggravate density it is adjustable, residue is few, breaking glue solution after filtering high temperature resistant recycle the features such as, be applicable in
In formation temperature 100-180 DEG C of reservoir pressing crack construction.High temperature resistant weighted fracture fluid production of the invention is simple, liquid speed
It is molten, site operation rapid preparing may be implemented, the performance with superior heatproof resistant to shearing.
The prepared weighted fracture fluid most high-density of the present invention can achieve 1.4g/cm3, heat resistance reach 180 DEG C, break
Gelatin viscosity is 480mg/L up to 3.482mPas, breaking glue solution residue content, and fracturing fluid system meets oil and gas industry
Standard " SY/T5107-2005 " aqueous fracturing fluid method of evaluating performance " standard ", can be good at meeting pressing crack construction demand.
Detailed description of the invention
Fig. 1 is the 1.20g/cm that density is embodiment 43Weighted fracture fluid viscosity-temperature curve；
Fig. 2 is the 1.30g/cm that density is embodiment 43Weighted fracture fluid viscosity-temperature curve；
Fig. 3 is the 1.40g/cm that density is embodiment 43Weighted fracture fluid viscosity-temperature curve；
Fig. 4 is the 1.20g/cm that density is embodiment 73Weighted fracture fluid viscosity-temperature curve；
Fig. 5 is the 1.30g/cm that density is embodiment 73Weighted fracture fluid viscosity-temperature curve；
Fig. 6 is the 1.40g/cm that density is embodiment 73Weighted fracture fluid viscosity-temperature curve；
Fig. 7 is the 1.20g/cm that density is embodiment 93Weighted fracture fluid viscosity-temperature curve；
Fig. 8 is the 1.30g/cm that density is embodiment 93Weighted fracture fluid viscosity-temperature curve；
Fig. 9 is the 1.40g/cm that density is embodiment 93Weighted fracture fluid viscosity-temperature curve.
Specific embodiment
The principle and features of the present invention will be described below with reference to the accompanying drawings, and the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the invention.The person that is not specified actual conditions in embodiment, according to normal conditions or the item suggested of manufacturer
Part carries out.Reagents or instruments used without specified manufacturer is the conventional products that can be obtained by commercially available purchase.
Embodiment 1:
The high temperature resistant weighted fracture fluid of the present embodiment, comprising: modified guanidine collagen powder 0.15wt%, acidic ph modifier
0.01wt%, heavy weight additive 10wt%, crosslinking agent 0.4wt%, cleanup additive 0.01wt%, fungicide 0.01wt%, temperature stability agent
The water of 0.01wt%, acidity gel breaker 0.1wt% and surplus.
The production method of modified guanidine collagen powder include: by the mixed solution of epoxychloropropane and propane sultone (V:V=7:
3) it is sprayed directly on the surface of guanidine collagen powder, is dried after mixing evenly, discrete modification guanidine collagen powder is obtained.
The acidic ph modifier that the present embodiment uses is formic acid；The heavy weight additive is potassium chloride；It is described acidity gel breaker be
Formic acid；The crosslinking agent includes: borax 15wt%, glycerol 20wt%, mannitol 20wt%, triethanolamine 30wt% and hydrogen-oxygen
Change sodium solution 15wt%.
Embodiment 2:
The high temperature resistant weighted fracture fluid of the present embodiment, comprising: modified guanidine collagen powder 0.6wt%, acidic ph modifier
0.05wt%, heavy weight additive 70wt%, crosslinking agent 1.0wt%, cleanup additive 0.2wt%, fungicide 0.2wt%, temperature stability agent
The water of 2.0wt%, acidity gel breaker 1.0wt% and surplus.
The production method of modified guanidine collagen powder include: by the mixed solution of epoxychloropropane and propane sultone (V:V=6:
4) it is sprayed directly on the surface of guanidine collagen powder, is dried after mixing evenly, discrete modification guanidine collagen powder is obtained.
The acidic ph modifier that the present embodiment uses is acetic acid；The heavy weight additive is sodium chloride；It is described acidity gel breaker be
Hydrochloric acid；The crosslinking agent includes: borax 30wt%, glycerol 15wt%, mannitol 5wt%, triethanolamine 30wt% and hydrogen-oxygen
Change sodium solution 20wt%.
Embodiment 3:
The high temperature resistant weighted fracture fluid of the present embodiment, comprising: modified guanidine collagen powder 0.4wt%, acidic ph modifier
0.025wt%, heavy weight additive 45wt%, crosslinking agent 0.6wt%, cleanup additive 0.08wt%, fungicide 0.08wt%, temperature stability agent
The water of 0.55wt%, acidity gel breaker 0.08wt% and surplus.
The production method of modified guanidine collagen powder include: by the mixed solution of epoxychloropropane and propane sultone (V:V=8:
2) it is sprayed directly on the surface of guanidine collagen powder, is dried after mixing evenly, discrete modification guanidine collagen powder is obtained.
The acidic ph modifier that the present embodiment uses is citric acid；The heavy weight additive is potassium formate；The acidity gel breaker
For nitric acid；The crosslinking agent includes: borax 25wt%, glycerol 5wt%, mannitol 20wt%, triethanolamine 30wt% and hydrogen
Sodium hydroxide solution 20wt%.
Embodiment 4:
The high temperature resistant weighted fracture fluid of the present embodiment, comprising: modified guanidine rubber powder 0.15wt%, acidic ph modifier
0.01wt%, heavy weight additive 10wt%, crosslinking agent 0.4wt%, cleanup additive 0.01wt%, fungicide 0.01wt%, temperature stability agent
The water of 0.01wt%, acidity gel breaker 0.1wt% and surplus.
The preparation method of modified guanidine rubber powder includes:
Guanidine glue is mixed with water and keeps the temperature 20min under 40 DEG C of oil bath, sodium hydroxide solution (0.1mol/ is then added
L), the mixed solution and cetyl trimethyl chlorine of propane sultone, polyethylene glycol (molecular weight be 200~1000) and ethyl alcohol
Change ammonium to be cooled to room temperature feed liquid as after phase transfer catalyst fully reacting, adjusting material liquid pH value to neutrality, crushed after being dried,
Modified guanidine rubber powder is made；Wherein, the mass ratio of guanidine glue, water and phase transfer catalyst is 1:2:0.01, sodium hydroxide solution, the third sulphur
The volume ratio of acid lactone, polyethylene glycol and ethyl alcohol is 1:0.5:0.1:0.5.
The acidic ph modifier that the present embodiment uses is lactic acid；The heavy weight additive is sodium formate；It is described acidity gel breaker be
First hydrochloric acid；The crosslinking agent includes: borax 28wt%, glycerol 12wt%, mannitol 20wt%, triethanolamine 20wt% and hydrogen
Sodium hydroxide solution 20wt%.
Embodiment 5:
The high temperature resistant weighted fracture fluid of the present embodiment, comprising: modified guanidine rubber powder 0.6wt%, acidic ph modifier
0.05wt%, heavy weight additive 70wt%, crosslinking agent 1.0wt%, cleanup additive 0.2wt%, fungicide 0.2wt%, temperature stability agent
The water of 2.0wt%, acidity gel breaker 1.0wt% and surplus.
The preparation method of modified guanidine rubber powder includes:
Guanidine glue is mixed with water and keeps the temperature 10min under 60 DEG C of oil bath, the hydrogen-oxygen that concentration is 0.05mol/L is then added
Change the mixed solution and phase transfer catalysis (PTC) of sodium solution, propane sultone, the polyethylene glycol that molecular weight is 200~1000 and ethyl alcohol
Feed liquid, is cooled to room temperature by agent hexadecyltrimethylammonium chloride after fully reacting, adjusting material liquid pH value to neutrality, powder after drying
It is broken, modified guanidine rubber powder is made；Wherein, the mass ratio of guanidine glue, water and phase transfer catalyst is 1:4:0.1, sodium hydroxide solution, third
The volume ratio of sultones, polyethylene glycol and ethyl alcohol is 3:2:1:1.5.
The acidic ph modifier that the present embodiment uses is formic acid and lactic acid (waiting than mixing)；The heavy weight additive be potassium chloride and
Potassium formate (is waited than mixing)；The acidity gel breaker is formic acid；The crosslinking agent includes: borax 25wt%, glycerol 18wt%, sweet
Reveal alcohol 15wt%, triethanolamine 28wt% and sodium hydroxide solution 14wt%.
Embodiment 6:
The high temperature resistant weighted fracture fluid of the present embodiment, comprising: modified guanidine rubber powder 0.4wt%, acidic ph modifier
0.025wt%, heavy weight additive 45wt%, crosslinking agent 0.6wt%, cleanup additive 0.08wt%, fungicide 0.08wt%, temperature stability agent
The water of 0.55wt%, acidity gel breaker 0.08wt% and surplus.
The preparation method of modified guanidine rubber powder includes:
Guanidine glue is mixed with water and keeps the temperature 15min under 50 DEG C of oil bath, the hydrogen-oxygen that concentration is 0.1mol/L is then added
Change the mixed solution and phase transfer catalysis (PTC) of sodium solution, propane sultone, the polyethylene glycol that molecular weight is 200~1000 and ethyl alcohol
Feed liquid, is cooled to room temperature by agent hexadecyltrimethylammonium chloride after fully reacting, adjusting material liquid pH value to neutrality, powder after drying
It is broken, modified guanidine rubber powder is made；Wherein, the mass ratio of guanidine glue, water and phase transfer catalyst be 1:3:0.05, sodium hydroxide solution,
The volume ratio of propane sultone, polyethylene glycol and ethyl alcohol is 2:1:0.5:1.
The acidic ph modifier that the present embodiment uses is citric acid；The heavy weight additive is sodium formate；The acidity gel breaker
For formic acid；The crosslinking agent includes: borax 20wt%, glycerol 15wt%, mannitol 15wt%, triethanolamine 30wt% and hydrogen
Sodium hydroxide solution 20wt%.
Embodiment 7:
The high temperature resistant weighted fracture fluid of the present embodiment, comprising: modified guanidine rubber powder 0.35wt%, acidic ph modifier
0.01wt%, heavy weight additive 30wt%, crosslinking agent 0.5wt%, cleanup additive 0.05wt%, fungicide 0.05wt%, temperature stability agent
The water of 0.05wt%, acidity gel breaker 0.5wt% and surplus.
The preparation method of modified guanidine rubber powder includes:
Guanidine glue is mixed with water and keeps the temperature 10min under 55 DEG C of oil bath, the hydrogen-oxygen that concentration is 0.1mol/L is then added
Change the mixed solution and phase transfer catalysis (PTC) of sodium solution, propane sultone, the polyethylene glycol that molecular weight is 200~1000 and ethyl alcohol
Feed liquid, is cooled to room temperature by agent hexadecyltrimethylammonium chloride after fully reacting, adjusting material liquid pH value to neutrality, powder after drying
It is broken, modified guanidine rubber powder is made；Wherein, the mass ratio of guanidine glue, water and phase transfer catalyst be 1:3:0.05, sodium hydroxide solution,
The volume ratio of propane sultone, polyethylene glycol and ethyl alcohol is 2.5:1:0.5:1.
The acidic ph modifier that the present embodiment uses is acetic acid；The heavy weight additive is sodium chloride；It is described acidity gel breaker be
Hydrochloric acid；The crosslinking agent includes: borax 28wt%, glycerol 12wt%, mannitol 13wt%, triethanolamine 27wt% and hydrogen-oxygen
Change sodium solution 20wt%.
Embodiment 8:
The high temperature resistant weighted fracture fluid of the present embodiment, comprising: modified guanidine rubber powder 0.55wt%, acidic ph modifier
0.04wt%, heavy weight additive 60wt%, crosslinking agent 0.7wt%, cleanup additive 0.1wt%, fungicide 0.1wt%, temperature stability agent
The water of 1.0wt%, acidity gel breaker 1.0wt% and surplus.
The preparation method of modified guanidine rubber powder includes:
Guanidine glue is mixed with water and keeps the temperature 20min under 45 DEG C of oil bath, sodium hydroxide solution (0.1mol/ is then added
L), the mixed solution and cetyl trimethyl chlorine of propane sultone, polyethylene glycol (molecular weight be 200~1000) and ethyl alcohol
Change ammonium to be cooled to room temperature feed liquid as after phase transfer catalyst fully reacting, adjusting material liquid pH value to neutrality, crushed after being dried,
Modified guanidine rubber powder is made；Wherein, the mass ratio of guanidine glue, water and phase transfer catalyst is 1:3:0.05, sodium hydroxide solution, the third sulphur
The volume ratio of acid lactone, polyethylene glycol and ethyl alcohol is 2:1:0.5:0.8.
The acidic ph modifier that the present embodiment uses is hydrochloric acid；The heavy weight additive is sodium formate；It is described acidity gel breaker be
Hydrochloric acid；The crosslinking agent includes: borax 30wt%, glycerol 15wt%, mannitol 10wt%, triethanolamine 25wt% and hydrogen-oxygen
Change sodium solution 20wt%.
Embodiment 9:
The high temperature resistant weighted fracture fluid of the present embodiment, comprising: modified guanidine rubber powder 0.45wt%, acidic ph modifier
0.02wt%, heavy weight additive 60wt%, crosslinking agent 0.65wt%, cleanup additive 0.08wt%, fungicide 0.06wt%, temperature stability agent
The water of 0.08wt%, acidity gel breaker 0.5wt% and surplus.
The preparation method of the modification guanidine rubber powder of the present embodiment is same as Example 8；The acid pH that the present embodiment uses is adjusted
Agent, the heavy weight additive, the acid gel breaker and the crosslinking agent are same as Example 8.
Embodiment 10:
The high temperature resistant weighted fracture fluid of the present embodiment, comprising: modified guanidine rubber powder 0.35wt%, acidic ph modifier
0.03wt%, heavy weight additive 40wt%, crosslinking agent 0.7wt%, cleanup additive 0.06wt%, fungicide 0.08wt%, temperature stability agent
The water of 0.06wt%, acidity gel breaker 0.7wt% and surplus.
The preparation method of the modification guanidine rubber powder of the present embodiment is same as Example 8；The acid pH that the present embodiment uses is adjusted
Agent, the heavy weight additive, the acid gel breaker and the crosslinking agent are same as Example 8.
Above-described embodiment 1 to embodiment 10 high temperature resistant weighted fracture fluid preparation process according to it is following cross carry out:
(1) heavy weight additive is added into water, adjusts pH value of solution to 6-8 with acidic ph modifier, thickening agent is then added and stirs
It mixes, fungicide, cleanup additive, temperature stability agent, acidic ph modifier and acid gel breaker is added after thickening agent aquation is complete and stirs
It mixes, obtains fracturing fluid base fluid；
(2) crosslinking agent mixing is added in Xiang Suoshu fracturing fluid base fluid, high temperature resistant weighted fracture fluid is made.
The weighted fracture fluid of above-described embodiment 1 to embodiment 10 is tested for the property respectively, is included under different densities
It aggravates pressure fluid performance test and constant temperature perseverance shears the viscosity test of 2h at 100 DEG C, test is indicated, the embodiment of the present invention 1
Weighted fracture fluid to embodiment 10 shows excellent performance: density is big, high temperature resistant and resistant to shearing superior performance, level of residue
It is few.
It is illustrated now with the testing result of embodiment 4, embodiment 7 and embodiment 9.
Test 1
Crosslinking agent is added in the prepared base fluid into embodiment 4, pours into rheometer after stirring 1~3min using glass bar
Measuring cylinder.Shear rate 170s is set-1, 5 DEG C/min of heating rate is warming up to 100 DEG C from 30 DEG C, and constant temperature perseverance is cut at 100 DEG C
Cut 2h.
Different densities weighted fracture fluid is tested in 1 embodiment 4 of table
Fig. 1 is that density is 1.20g/cm3Weighted fracture fluid viscosity-temperature curve；Fig. 2 is that density is 1.30g/cm3Weighted fracture fluid
Viscosity-temperature curve；Fig. 3 is that density is 1.40g/cm3Weighted fracture fluid viscosity-temperature curve.
Test 2
Crosslinking agent is added in the prepared base fluid into embodiment 7, pours into rheometer after stirring 1~3min using glass bar
Measuring cylinder.Shear rate 170s is set-1, 5 DEG C/min of heating rate is warming up to 140 DEG C from 30 DEG C, and constant temperature perseverance is cut at 140 DEG C
Cut 2h.
Different densities weighted fracture fluid is tested in 2 embodiment 7 of table
Fig. 4 is that density is 1.20g/cm3Weighted fracture fluid viscosity-temperature curve；Fig. 5 is that density is 1.30g/cm3Weighted fracture fluid
Viscosity-temperature curve；Fig. 6 is that density is 1.40g/cm3Weighted fracture fluid viscosity-temperature curve.
Test 3
Crosslinking agent is added in the prepared base fluid into embodiment 9, pours into rheometer after stirring 1~3min using glass bar
Measuring cylinder.Shear rate 170s is set-1, 5 DEG C/min of heating rate is warming up to 160 DEG C from 30 DEG C, and constant temperature perseverance is cut at 160 DEG C
Cut 2h.
Different densities weighted fracture fluid is tested in 3 embodiment 9 of table
Fig. 7 is that density is 1.20g/cm3Weighted fracture fluid viscosity-temperature curve；Fig. 8 is that density is 1.30g/cm3Weighted fracture fluid
Viscosity-temperature curve；Fig. 9 is that density is 1.40g/cm3Weighted fracture fluid viscosity-temperature curve.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of high temperature resistant weighted fracture fluid characterized by comprising thickening agent 0.15wt%~0.6wt%, acid pH are adjusted
0~0.05wt% of agent, heavy weight additive 10wt%~70wt%, crosslinking agent 0.4wt%~1.0wt%, cleanup additive 0.01wt%~
0.2wt%, fungicide 0.01wt%~0.2wt%, temperature stability agent 0.01wt%~2.0wt%, acid gel breaker 0.1wt%
The water of~1.0wt% and surplus.
2. high temperature resistant weighted fracture fluid according to claim 1 characterized by comprising thickening agent 0.35wt%~
0.55wt%, 0.01~0.04wt% of acidic ph modifier, heavy weight additive 30wt%~60wt%, crosslinking agent 0.5wt%~
0.7wt%, cleanup additive 0.05wt%~0.1wt%, fungicide 0.05wt%~0.1wt%, temperature stability agent 0.05wt%~
The water of 1.0wt%, acidity gel breaker 0.5wt%~1.0wt% and surplus.
3. high temperature resistant weighted fracture fluid according to claim 2 characterized by comprising thickening agent 0.35wt%~
0.45wt%, 0.02~0.03wt% of acidic ph modifier, heavy weight additive 40wt%~60wt%, crosslinking agent 0.65wt%~
0.7wt%, cleanup additive 0.06wt%~0.08wt%, fungicide 0.06wt%~0.08wt%, temperature stability agent 0.06wt%
The water of~0.08wt%, acidity gel breaker 0.5wt%~0.7wt% and surplus.
4. high temperature resistant weighted fracture fluid according to any one of claims 1 to 3, which is characterized in that the thickening agent is to change
Property one or both of guanidine collagen powder and modified guanidine rubber powder.
5. high temperature resistant weighted fracture fluid according to claim 4, which is characterized in that the preparation method of the modified guanidine rubber powder
Include:
Guanidine glue is mixed with water and keeps the temperature 10min~20min under 40 DEG C~60 DEG C of oil bath, concentration, which is then added, is
Sodium hydroxide solution, propane sultone, the polyethylene glycol that molecular weight is 200~1000 and the second of 0.05mol/L~0.15mol/L
Feed liquid, is cooled to room temperature by the mixed solution and phase transfer catalyst hexadecyltrimethylammonium chloride of alcohol after fully reacting,
Material liquid pH value is adjusted to neutrality, modified guanidine rubber powder is made in crushed after being dried；
Wherein, the mass ratio of guanidine glue, water and phase transfer catalyst is 1:(2-4): (0.01-0.1), sodium hydroxide solution, the third sulphur
The volume ratio of acid lactone, polyethylene glycol and ethyl alcohol is (1-3): (0.5-2): (0.1-1): (0.5-1.5).
6. high temperature resistant weighted fracture fluid according to claim 4, which is characterized in that the preparation side of the modified guanidine collagen powder
Method includes: that the mixed solution of epoxychloropropane and propane sultone is sprayed to the surface of guanidine collagen powder, is dried after mixing evenly；
Wherein, the volume ratio of epoxychloropropane and propane sultone is (6-8): (2-4).
7. high temperature resistant weighted fracture fluid according to any one of claims 1 to 3, which is characterized in that
The acidic ph modifier includes the mixture of one or more of formic acid, acetic acid, citric acid, hydrochloric acid and lactic acid；
The heavy weight additive includes one or both of alkali halide and alkali metal formate；
The acidity gel breaker includes one of formic acid, hydrochloric acid and nitric acid or a variety of.
8. high temperature resistant weighted fracture fluid according to any one of claims 1 to 3, which is characterized in that the crosslinking agent includes:
Borax 15wt%~30wt%, glycerol 5wt%~20wt%, mannitol 5wt%~20wt%, triethanolamine 15wt%~
0~20wt% of 30wt% and sodium hydroxide solution.
9. high temperature resistant weighted fracture fluid according to any one of claims 1 to 3, which is characterized in that the high temperature resistant aggravates
The density of fracturing fluid is 1.10g/cm3~1.40g/cm3。
10. the preparation method of the described in any item high temperature resistant weighted fracture fluids of claim 1 to 9 characterized by comprising
(1) heavy weight additive is added into water, with acidic ph modifier adjusting pH value of solution to 6-8, thickening agent stirring is then added, to
Fungicide, cleanup additive, temperature stability agent, acidic ph modifier and acid gel breaker stirring is added in thickening agent aquation afterwards completely, obtains
To fracturing fluid base fluid；
(2) crosslinking agent mixing is added in Xiang Suoshu fracturing fluid base fluid, high temperature resistant weighted fracture fluid is made.
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