CN101629074A - Formulation for preparing fracturing fluid from biological enzyme preparation - Google Patents
Formulation for preparing fracturing fluid from biological enzyme preparation Download PDFInfo
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- CN101629074A CN101629074A CN200910164483A CN200910164483A CN101629074A CN 101629074 A CN101629074 A CN 101629074A CN 200910164483 A CN200910164483 A CN 200910164483A CN 200910164483 A CN200910164483 A CN 200910164483A CN 101629074 A CN101629074 A CN 101629074A
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Abstract
The invention relates to a formulation for fracturing fluid from a biological enzyme preparation, which is prepared from 0.2-0.5 percent (mass percent) of biological enzyme plugging removal agent, a thickening agent hydroxyproppyl guar gum, a cross-linking agent borax or an organic boron cross-linking agent and a biological gel breaker. The cross-linking ratio of the cross-linking agent is 100:5 or 100:0.25. The formulation has favorable environment-friendly performance, is suitable for an oil well the pH value of which is 4-10, and has the advantages of super activity and catalytic force, small consumption, convenient use, improved efficiency, no residue after gel breaking, long time acted under stratum, favorable restoring and stabilizing functions on stratus rock core, favorable water solubility and wetting effect, favorability for accelerating the movement of water molecules, simple and convenient operation, simple equipment for on-site construction and the like.
Description
Technical field
The present invention relates to the technology that a kind of oil field use chemicals carries out pressure break, especially a kind of prescription that utilizes the biological enzyme formulation preparing fracturing fluid.
Background technology
At present in order to improve the ultimate recovery factor in oil field, under developmently take a lot of well stimulations, wherein the porosity and the rate of permeation of formation fracturing raising oil reservoir are one of main well stimulations, especially low permeability oil field, because the porosity and the rate of permeation of rock stratum are lower, just can't put into production as not carrying out pressure break, fracturing yield increasing method is feasible, but different fracturing technologies has different effects, and different defectives is also arranged, as fracture acidizing, certain effect of increasing production is arranged, but bigger to the oil well pipe corrosion, the work-ing life of having reduced tubing and casing, the stratum caused cave in, cause old reservoir choke; Pressure break squeeze the sand effect also can, but in quartz sand, have residual fracturing liquid, the time is long easily hardens, cause new obstruction, along with oil recovery pressure reduction increases gradually, crude oil also arrives the shaft bottom to the abrasive band, cause the shaft bottom to stop up, be extracted into ground with oil and cause collection transmission pipe network to stop up and collect the wearing and tearing of transfer device.Gel breaker is one of requisite material in the pressing crack construction, it mainly acts on is after formation fracture forms the thorough aquation viscosity reduction of high viscosity fracturing fluid frozen glue to be beneficial to fracturing liquid counter ejecting from the stratum, the flow conductivity of propping agent is given full play to, so whether fracturing liquid rubber-breaking thoroughly directly have influence on the quality of fracturing effect.
Original broken colloid system is an ammonium persulphate, and Potassium Persulphate etc., additive have cleanup additive, emulsion splitter, promoting agent and sterilant etc., and the problem of existence is: speed slowly, not environmental protection, residue is many, injury is big, medicament kind is many, synergetic property is poor.Investigate demonstration through us, prolong oil field compression fracture and may have three major injury problems: i.e. cold damage, water injury and residue injury restricted fracturing yield increasing efficient.
1, uses cold water to carry out pressure break, can produce cold damage.Because crude oil contains compositions such as wax, the possibility of knot organic deposition is arranged.
2, water injury-water lock, the organic-inorganic dirt.Behind the broken glue of fracturing process, the interface dialysis influence of generation, the water lock, problems such as fouling produce, and influence is row instead.
3, residue injury: the broken glue speed of melon glue is slow, and not thorough, residue is many.
Fracturing liquid CHEMICAL DEVELOPMENT direction is high-quality, low infringement, low-cost and eco-friendly novel material and industrial system; Essential Chemistry, chemical engineering, chemical technology, materialogy need be combined with the petroleum natural gas exploration engineering, laboratory experiment is put into practice with mining site and is combined.The broken glue of biological enzyme pressure break has become the main flow direction of the broken glue of next step pressure break.
Summary of the invention
The purpose of this invention is to provide a kind of prescription that utilizes the biological enzyme formulation preparing fracturing fluid, can effectively solve three injury problems, by adding an amount of biological enzymolysis blocking agent, play the prevention cold damage as spearhead solution by heating, the effect of prevention wax deposition, the omnidistance biological enzymolysis blocking agent that adds, has the reduction oil water interfacial tension, clean oil-sand is eliminated the water lock, the viscosity reduction de-plugging, influent, anti-easily row improves the near-well-bore permeability effect, uses biological broken glue technology, broken glue speed is fast, broken glue is thorough, and residue is few, improves fissured perviousness greatly.
Technical scheme of the present invention realizes in the following manner:
A kind of prescription that utilizes the biological enzyme formulation preparing fracturing fluid, with mass percent is that biological enzymolysis blocking agent and the viscosifying agent hydroxypropyl guar gum of 0.2-1%, the linking agent borax of 3-10% and the biological gel breaker of 0.005-0.1% of 0.2-0.5% is re-dubbed fracturing liquid, compress at normal temperatures in oil well or the well with fracturing truck, drive a well after 4 hours.
Biological gel breaker is that the biological enzyme gel breaker adds that for the ratio of 0.01-0.1% the assistant agent of 0-0.05% is formulated by mass percentage.Assistant agent is that the water purification agent of sodium bicarbonate, 0-0.1% of yellow soda ash, the 0-2% of citric acid, the 0-2% of zymoexciter, the 0-0.5% of 0-2% and water are joined by mass percent.
Biological enzyme formulation is the proteolytic enzyme of 20-50%, the cellulase of 30-50%, compound the making of papain of 0-50% by mass percent; Perhaps mass percent is the proteolytic enzyme of 20-50%, the cellulase of 30-50%, the papain of 10-40%, the opsonigenous substances of 2-10%, compound the making of biologically active agent of 5-20%, and perhaps biological Scale inhibitors is compound makes for the papain of the cellulase of the proteolytic enzyme of 20-50%, 30-50%, 10-40% and 10mg/L-5000mg/L.
Linking agent can also be an organic borate cross-linker, and mass percent is 0.1-0.5%, and the crosslinked ratio of linking agent is 100: 5--100: 0.25.
Fracturing liquid also can add the liquid nitrogen of 5-30m3 or 10mg/L-5000mg/L Scale inhibitors and viscosifying agent, linking agent, biological gel breaker is formulated.
Advantage of the present invention is that to have the feature of environmental protection good, oil production environment and people there is not injury, pollution-free, be applicable to the oil well of pH value for 4-10, have super-active and catalytic force, consumption is little, easy to use, enter the microcosmic duct by inducing with spontaneous dialyzing, be adsorbed on the rock core top layer, degrade crude oil, have complementary advantages, improve usefulness, do not have residue behind the broken glue, following action time is lasting on the stratum, formation core is had good recovery stabilization function, water-soluble, wetting effect good, favourable quickening water molecules motion, easy and simple to handle, site operation equipment is simple etc.
Embodiment
For further disclosing technical scheme of the present invention, elaborate below by embodiment:
Embodiment one: under the normal temperature, by mass percent be 2% zymoexciter and water join assistant agent, be by mass percentage the assistant agent of 0.1% biological enzyme gel breaker and 0.05% and water join biological gel breaker.
With mass percent is that 0.5% biological enzymolysis blocking agent and 0.3 hydroxypropyl guar gum, 5% borax and 0.02% biological gel breaker are re-dubbed fracturing liquid, compresses at normal temperatures in oil well or the well with fracturing truck, drives a well after 4 hours.
The biological enzymolysis blocking agent is 50% proteolytic enzyme, 30% cellulase, 20% compound the making of papain by mass percent.
Be 0.5% biological enzymolysis blocking agent, 0.6% melon glue, 5% borax, 0.1% biological enzyme gel breaker and 0.05% assistant agent configuration fracturing liquid with mass percent under embodiment two, the normal temperature, fracturing liquid be pressed onto in the stratum with fracturing truck.Wherein assistant agent is that 2% zymoexciter, 0.5% citric acid, 2% yellow soda ash and water are joined.
Embodiment three: by a bite well 100m3 fracturing liquid, reservoir temperature is 50 ℃ of calculating, need 0.5 ton of biological enzymolysis blocking agent, 0.3 ton in melon glue, 5 tons of borax linking agents, biological enzyme gel breaker 20Kg, whole process is carved the type adding behind the mixing, the 20Kg assistant agent finishes to carve type with 15-20min and adds adding sand, and anti-row drives a well behind the closing well 4h.
Embodiment four: if the lower oil well of water-oil ratio, the fracturing liquid that adds the liquid nitrogen preparation of 10m3 according to embodiment three carries out pressure break, fracturing liquid is pressed onto in the stratum closing well discharge opeing that normally drives a well after 4 hours in the intact back of pressure break with fracturing truck.
Biological enzyme formulation mixed with viscosifying agent, linking agent be re-dubbed fracturing liquid, compress at normal temperatures in oil well or the well with fracturing truck, in the crack closure process, the biological enzymolysis blocking agent is infiltrated pore throat, and biological gel breaker is carved the type adding from injecting spearhead to displacing liquid whole process.As require brokenly glue to speed up, and can add assistant agent, assistant agent finishes 15-20min and carves type and add adding sand, can give full play to broken glue speed-controllable, broken glue advantage completely, guarantees that fracturing liquid takes grittiness and can in time thoroughly break glue under the prerequisite.
The reservoir rock surface wettability is divided into that oil is wet, water wet and is middle wetting, the wetting regime on reservoir rock surface has very big influence to crude oil flow, the oil wettability rock is strong to the adhesive power of crude oil, and water membrane is easily formed on the surface of wetting ability rock, has weakened the adhesive power to crude oil.
Biological enzyme formulation is as a kind of water-soluble products, it can make the reservoir rock wettability of the surface transform to the wet direction of water from oil is wet, thereby change the wetting regime of reservoir rock, reduce the interfacial tension between oil-rock stratum, make crude oil be easy to strip down from rock surface, the biological enzymolysis blocking agent also has certain viscosity reduction effect simultaneously, thereby has reduced the resistance to flow of crude oil in formation pore.Under the effect of reservoir pressure, crude oil easily from around flow to pit shaft, play increase oil effect.
Biological enzyme formulation is when quickening displacement oil stream, form the effective molecular film structure of one deck on the oil reservoir top layer, oil reservoir is played the effect that prevents once more dirt deposition, anti-sealing injury, so comprehensive action improves greatly, effectively raise water-injection capability, recovery ratio is improved, and has the reduction petroleum sand carrying property, reduce the friction of fluid and sandstone, thereby reach stable effect.
Make its cracking by the specific glycosidic link in catalysis guanidine glue surface, polymerization macromolecular complex in the most broken glue raffinate is changed into simple unreducible monose, make the fracturing liquid raffinate from proppant pack, more stably to return and eject, reduce the polymkeric substance injury, improve oil recovery gas production yield-increasing efficiency.
In the present invention, biological enzyme fractured well selection principle is: (1) selects the well that skin factor is higher, the oil reservoir injury weighs.Skin factor is tried to achieve by build-up analysis.(2) choose the well lower than liquid-producing capacity.Be meant the ratio of present production fluid amount and peak value production fluid amount than liquid-producing capacity, this ratio is low more, and the pressure break measure may be effective more.(3) choose the lower well of water-oil ratio.Water-oil ratio is lower, and fractured well is potential more.(4) choose the well that the individual well recovery ratio is a block overall recovery factor mean value.If the individual well recovery ratio is very low, illustrate that the oil reservoir grade is very poor; If this value is very high, illustrate that oil well does not need the pressure break measure; If the very approaching oil of this value drives mean value, the most suitable pressure break of this well.(5) choose well that never carried out the secondary well stimulation or the well that never carried out well stimulation in 5 years in the past.
In the present invention, the qualifications of screening fractured well is: the block that (1) implements pressure break should be in the ripe water drive stage, guarantees to have reached stabilization of fluidized.(2) reservoir pressure should be on bubbling pressure.Only in this way, in most cases gassiness saturation concentration and gas compressive coefficient can be ignored.(3) fractured well of Xuan Zeing should have stable production history, so that the calculation stability daily oil production.
Biological enzyme formulation and viscosifying agent, linking agent etc. are re-dubbed fracturing liquid, and biological enzyme formulation is carved type to displacing liquid whole process and is added from injecting spearhead.As require brokenly glue to speed up, and can add assistant agent, assistant agent finishes 15-20min and carves type and add adding sand, can give full play to broken glue speed-controllable, broken glue advantage completely, guarantees that fracturing liquid takes grittiness and can in time thoroughly break glue under the prerequisite.
Biological enzyme is the biomacromolecule material with catalytic activity and special space conformation.What enzyme was followed is " key principle ", i.e. the principle of " lock of a key ".
The biological enzyme fracturing technique does not change existing pressure break pattern, just carries out the optimization of implementing process.Except that melon glue, linking agent, propping agent, temporary plugging agent, broken glue, the row of helping, breakdown of emulsion, promoting agent, sterilant are all finished with biological enzyme formulation.
The biocatalysis of the biological enzyme formulation by specific purification, the skeleton bond rupture with high molecular polymer-melon glue makes it be degraded to low-molecular weight polymer, remove polymer residue fast, improve the oil gas rate of permeation, allow the oil gas well reach best operation state, obtain good economic gain.Utilize the biological enzymolysis blocking agent to carry out the oil reservoir protection, pre-good antiscale property cleans crude oil targetedly, eliminates the water lock, and the viscosity reduction de-plugging improves percolation ability, comprehensively improves the pressure break measure, obtains the achievement of clean fracturing.
Claims (7)
1, a kind of prescription that utilizes the biological enzyme formulation preparing fracturing fluid, it is characterized in that with mass percent being that biological enzymolysis blocking agent and the viscosifying agent hydroxypropyl guar gum of 0.2-1%, the linking agent borax of 3-10% and the biological gel breaker of 0.005-0.1% of 0.2-0.5% is re-dubbed fracturing liquid, compress at normal temperatures in oil well or the well with fracturing truck, drive a well after 4 hours.
2, a kind of prescription that utilizes the biological enzyme formulation preparing fracturing fluid according to claim 1 is characterized in that linking agent can also be an organic borate cross-linker, and mass percent is 0.1-0.5%.
3, a kind of prescription that utilizes the biological enzyme formulation preparing fracturing fluid according to claim 1 is characterized in that in the fracturing liquid adding the liquid nitrogen of 5-30m3 or 10mg/L-5000mg/L Scale inhibitors and viscosifying agent, linking agent, biological gel breaker is formulated.
4, a kind of prescription that utilizes the biological enzyme formulation preparing fracturing fluid according to claim 1 is characterized in that described biological gel breaker is that the biological enzyme gel breaker adds that for the ratio of 0.01-0.1% the assistant agent of 0-0.05% is formulated by mass percentage.
5, a kind of prescription that utilizes the biological enzyme formulation preparing fracturing fluid according to claim 1 is characterized in that described biological enzyme formulation is the proteolytic enzyme of 20-50%, the cellulase of 30-50%, compound the making of papain of 0-50% by mass percent; Perhaps mass percent is the proteolytic enzyme of 20-50%, the cellulase of 30-50%, the papain of 10-40%, the opsonigenous substances of 2-10%, compound the making of biologically active agent of 5-20%, and perhaps biological Scale inhibitors is compound makes for the papain of the cellulase of the proteolytic enzyme of 20-50%, 30-50%, 10-40% and 10mg/L-5000mg/L.
6, a kind of prescription that utilizes the biological enzyme formulation preparing fracturing fluid according to claim 4 is characterized in that described assistant agent is that the water purification agent of sodium bicarbonate, 0-0.1% of yellow soda ash, the 0-2% of citric acid, the 0-2% of zymoexciter, the 0-0.5% of 0-2% and water are joined by mass percent.
7, a kind of prescription that utilizes the biological enzyme formulation preparing fracturing fluid according to claim 1 is characterized in that the crosslinked ratio of linking agent is 100: 5--100: 0.25.
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| CN200910164483A CN101629074A (en) | 2009-06-30 | 2009-07-31 | Formulation for preparing fracturing fluid from biological enzyme preparation |
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| CN200910016939.6 | 2009-06-30 | ||
| CNA2009100169396A CN101608113A (en) | 2009-06-30 | 2009-06-30 | A kind of prescription that utilizes the biological enzyme formulation preparing fracturing fluid |
| CN200910164483A CN101629074A (en) | 2009-06-30 | 2009-07-31 | Formulation for preparing fracturing fluid from biological enzyme preparation |
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Cited By (3)
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| CN102305050A (en) * | 2011-07-12 | 2012-01-04 | 西安石油大学 | SUN-W100 biological enzyme well completion production increasing process for well completion plugging removal of oil field |
| CN102536165A (en) * | 2012-02-07 | 2012-07-04 | 西南石油大学 | Method and device for removing water lock damage of low-permeability densified sandstone air layer |
| CN103911140A (en) * | 2013-01-09 | 2014-07-09 | 中国石油化工股份有限公司 | Combined-type fracturing fluid bio-enzyme gel breaker and application method thereof |
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| CN101781551B (en) * | 2010-03-05 | 2013-06-05 | 西安石油大学 | Bio-enzyme well completion fluid |
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| CN106893573A (en) * | 2015-12-17 | 2017-06-27 | 大连百奥泰科技有限公司 | A kind of biological fracturing fluid system and its preparation and application |
| CN109971444A (en) * | 2019-04-10 | 2019-07-05 | 苏州泽方新能源技术有限公司 | Biological enzymolysis blocking agent suitable for oil gas field |
| CN109971453A (en) * | 2019-04-23 | 2019-07-05 | 咸阳川庆鑫源工程技术有限公司 | Energy saving and environment friendly biological fracturing fluid of one kind and its preparation method and application |
| CN114989802B (en) * | 2022-07-18 | 2022-10-25 | 胜利油田方圆化工有限公司 | Preparation method and application of fracturing fluid thickening agent for oil and gas exploitation |
| CN117447977B (en) * | 2023-12-18 | 2024-02-23 | 东营市百扬石油科技有限责任公司 | Preparation method and application of blocking remover containing biological enzyme |
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| CN102536165A (en) * | 2012-02-07 | 2012-07-04 | 西南石油大学 | Method and device for removing water lock damage of low-permeability densified sandstone air layer |
| CN103911140A (en) * | 2013-01-09 | 2014-07-09 | 中国石油化工股份有限公司 | Combined-type fracturing fluid bio-enzyme gel breaker and application method thereof |
| CN103911140B (en) * | 2013-01-09 | 2016-09-14 | 中国石油化工股份有限公司 | A kind of combined fracturing fluid enzyme gel breaker and using method thereof |
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| CN101608113A (en) | 2009-12-23 |
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Application publication date: 20100120 |