Fluid loss additive and preparation methodTechnical field
The present invention relates to of the fracturing fluid treatment technology, specifically a kind of fluid loss additive and preparation method.
Technical background
Of the fracturing fluid filtration characteristics is very large to fracturing fluid performance impact. The lower width generation capacity of fluid loss rateStronger, more obvious to oil and gas reservoir correctional effect. Of the fracturing fluid filtration property has become many oil gas fieldsThe problem that exploitation and engineering service company are concerned about most.
The total leak-off of fracturing fluid generally can be divided into two parts: instantaneous leak-off, the liquid representing with leakoff coefficentThe long filtration characteristics of body. Instantaneous leak-off degree depends on fracturing fluid viscosity, formation temperature and infiltrationRate. Use the object of fluid loss additive to be effectively to reduce of the fracturing fluid instantaneous leak-off and leakoff coefficent.The effect of different types of fluid loss additive under different amounts differs greatly.
For the normally hydro carbons of liquid fluid loss additive host of aqueous fracturing fluid, there are diesel oil, crude cresylic acid, ore depositThe former wet goods in field. The Main Function mechanism of this class fluid loss additive is in water, to form oil-in-water (micro-) emulsion,The leak-off that emulsion sees through filter cake is two-phase flow, and resistance is larger, thereby makes the water permeability reduction of filter cake.Hydro carbons and water do not dissolve each other, and place the night diesel oil layering of just can floating after dosing.
Hydro carbons fluid loss additive mainly contains diesel oil, toluene, unsaturated hydrocarbons and oils etc. Due toToluene is poisonous, and scene is many need not.
Summary of the invention
The present invention provides a kind of fluid loss additive and preparation method in order to solve the problems of the technologies described above.
According to an aspect of the present invention, provide a kind of fluid loss additive, leak-off, falls in meter by weightAgent raw material comprises 700～800 parts of oils, 10～75 parts of hydrocarbon dispersant As, 10～75 partsHydrocarbon dispersant B and 10～50 parts of cedar oils.
Meter by weight, above-mentioned fluid loss additive material composition becomes to amount to arbitrary proportion mixtureBetween 730～1000 parts.
Described oils comprises by weight percentage, alkane 28-48%, aromatic hydrocarbons 20-50%,Unsaturated hydrocarbons 1-6%, cyclic hydrocarbon 17-44%.
Described hydrocarbon dispersant A is hydrophilic emulsifying agent.
Described hydrocarbon dispersant B is lipophilic emulsifying agent.
According to another aspect of the present invention, provide a kind of preparation method of fluid loss additive, by weightNumber meter, under normal pressure, successively by 700～800 parts of oils, stir 10～75Part hydrocarbon dispersant A and 10～75 parts of hydrocarbon dispersant Bs and 10～50 parts of cedar oils evenly mix,Obtain fluid loss additive.
Described oils comprises by weight percentage, alkane 28-48% and aromatic hydrocarbons20-50%, unsaturated hydrocarbons 1-6%, cyclic hydrocarbon 17-44%.
Described hydrocarbon dispersant A is hydrophilic emulsifying agent.
Described hydrocarbon dispersant B is lipophilic emulsifying agent.
Advantage of the present invention and effect: the fluid loss additive that utilizes the method to make, mainly transform at gas wellMiddle low-concentration carboxymethyl fracturing fluid system supports the use, by add fluid loss additive with not with fluid loss additiveLiquid system filtration property contrast, can find out, add liquid shape in fracturing fluid of fluid loss additiveBecome oil-in-water (micro-) emulsion, make the water permeability reduction of filter cake, with reach effectively reduce of the fracturing fluidInstantaneous leak-off and leakoff coefficent. The present invention disperses soon in aqueous fracturing fluid, forms emulsion, and plantsThe of the fracturing fluid compatibility of thing glue base is good, can effectively reduce of the fracturing fluid instantaneous leak-off and leak-off systemNumber, reduces the double action that emulsion stops up, and can also keep the resistance to shearing of fracturing fluid heatproof at high temperatureAnd viscosity performance. Matching used the falling of low-concentration carboxymethyl fracturing fluid system using in gas well transformationFluid loss agents and preparation technology.
Fluid loss additive provided by the invention, can form emulsion with aqueous fracturing fluid and landing leak-off workWith, there is good peptizaiton, good with the compatibility of PLANT GUM WATER BASE FRACTURING FLUIDS, can effectively reduceOf the fracturing fluid instantaneous leak-off and leakoff coefficent, reduce the double action that emulsion stops up, simultaneously at high temperatureUnder on the resistance to shearing of of the fracturing fluid heatproof and viscosity performance without any impact.
Brief description of the drawings
The fluid loss additive preparation method's that Fig. 1 provides for the embodiment of the present invention flow chart.
Detailed description of the invention
Referring to Fig. 1, below in conjunction with embodiment, the invention will be further described:
Embodiment 1
1) under normal pressure, in 1000ml container, add 700ml part oils, stand-by;
2) in dry blender jar, get 10ml hydrocarbon dispersant A, 10ml hydrocarbon dispersant B, mix,Stir 15min even;
3) mixed liquor of the above-mentioned hydrocarbon dispersant A stirring and hydrocarbon dispersant B is joined slowlyIn the oils of 1000ml container;
4) mentioned component is mixed to rear stirring 15min;
5) add 10ml cedar oil, mix and obtain 730ml fluid loss additive.
Wherein oils is the high-purity coal purchased from Beijing north bridge Bo Run petrochemical industry Co., LtdOil, by weight percentage, alkane (C11-15) 28-48%, aromatic hydrocarbons (C15-17) 20-50%,Unsaturated hydrocarbons (C11-14) 1-6%, cyclic hydrocarbon (C15-17) 17-44%; Hydrocarbon dispersant A is that Qingyang is long(Tween-20, chemical name is polyoxy to the hydrophilic emulsifying agent that celebrating down-hole auxiliary agent Co., Ltd producesEthene sorbitan fatty acid ester); Hydrocarbon dispersant B is Chang Qing down-hole, Qingyang auxiliary agent Limited Liability public affairs(Tween-80, chemical name is polyoxyethylene sorbitan aliphatic acid to the lipophilic emulsifying agent that department producesEster); Cedar oil is purchased from the undersaturated glyceride of the sky, Beijing auspicious sign Science and Technology Ltd., hasInvestigation of stabilized dispersion of nano.
Embodiment 2
1) under normal pressure, in 1000ml container, add 800ml part oils, stand-by;
2) in dry blender jar, get 75ml hydrocarbon dispersant A, 75ml hydrocarbon dispersant B, mix,Stir 15min even;
3) mixed liquor of the above-mentioned hydrocarbon dispersant A stirring and hydrocarbon dispersant B is joined slowlyIn the oils of 1000ml container;
4) mentioned component is mixed to rear stirring 15min;
5) add 50ml cedar oil, mix and obtain 1000ml fluid loss additive.
Embodiment 3
1) under normal pressure, in 1000ml container, add 700ml part oils, stand-by;
2) in dry blender jar, get 75ml hydrocarbon dispersant A, 75ml hydrocarbon dispersant B, mix,Stir 15min even;
3) mixed liquor of the above-mentioned hydrocarbon dispersant A stirring and hydrocarbon dispersant B is joined slowlyIn the oils of 1000ml container;
4) mentioned component is mixed to rear stirring 15min;
5) add 50ml cedar oil, mix and obtain 900ml fluid loss additive.
By above-described embodiment gained fluid loss additive according to " SY-T5107-2005 aqueous fracturing fluid performance is commentedValency method " in relevant provision detect:
The contrast of table 1 filtration property
Select the rule of fluid loss additive as follows:
1. can be not with fluid loss additive in foam fracturing fluid and polymer emulsified fracturing fluid.
2. when reservoir gas permeability is less than 0.01 × 10-3μm2, oleic permeability is less than 0.1 × 10-3μm2Time, can or needn't screen especially fluid loss additive not with fluid loss additive.
3. when reservoir gas permeability is greater than 0.01 × 10-3μm2And be less than 1 × 10-3μm2, oleic permeabilityBe greater than 0.1 × 10-3μm2And be less than 10 × 10-3μm2Time (Soviet Union Sulige gas field gas-bearing formation permeability belong to this modelEnclose), can use liquid state or liquid state to add solid-state fluid loss additive.
4. when reservoir gas permeability is greater than 1 × 10-3μm2, oleic permeability is greater than 10 × 10-3μm2Time,Can use 0.4%～0.7% solid-state fluid loss additive.
5. as there is intrinsic fracture on stratum, stitch the wide particle diameter of solid-state fluid loss additive used while being less than 50 μ mShould be in 200 order left and right, when seam is wider than 50 μ m, particle diameter should be in 100 order left and right; As crack pressure and oilHide pressure differential more than 14MPa, should use a large amount of fluid loss additives.
It should be noted last that, above detailed description of the invention is only in order to illustrate technical scheme of the present inventionAnd unrestricted, although the present invention is had been described in detail with reference to example, the ordinary skill people of this areaMember should be appreciated that and can modify or be equal to replacement technical scheme of the present invention, and does not depart fromThe spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.