CN101608543A - A kind of cleaning fracturing outlet liquid recovery oil displacement and de-plugging process - Google Patents
A kind of cleaning fracturing outlet liquid recovery oil displacement and de-plugging process Download PDFInfo
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- CN101608543A CN101608543A CNA2009100169381A CN200910016938A CN101608543A CN 101608543 A CN101608543 A CN 101608543A CN A2009100169381 A CNA2009100169381 A CN A2009100169381A CN 200910016938 A CN200910016938 A CN 200910016938A CN 101608543 A CN101608543 A CN 101608543A
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Abstract
The present invention relates to a kind of cleaning fracturing outlet liquid recovery oil displacement and de-plugging process, step has: broken glue, add flocculant, adhesive mud remover or bactericide carry out sedimentation of suspension, sterilization, filtered and recycled, filter through accurate filter is smart once more, in filtered fluid, add biological enzyme formulation etc., solved the problem of environmental pollution of fracturing outlet liquid up hill and dale, remaining oil in the displacement oil reservoir effectively, improve oil recovery factor, and have characteristic of environmental protection, can obviously improve the core performance, recover in-place permeability, improve the water-wet effect, strengthen anti-swollen steady sand effect, stop dirt to form deposition once more, reduce oil water interfacial tension, improve oil recovery factor.
Description
Technical field
The present invention relates to a kind of waste liquid chemical recovery technology, especially a kind of recovery displacement of reservoir oil of cleaning fracturing outlet liquid and de-plugging treatment process.
Background technology
Various load fluids have appearred in the continuous development along with fracturing.In pressure break operations such as water base, emulsification and foam, using maximum fracturing fluids is water-base gel fracturing fluid, and wherein thickener all is some high molecular polymers, as the crosslinked guanidine glue of boron, hydroxypropyl cellulose, polyacrylamide etc.These polymer can satisfy the requirement of present site operation to liquid substantially.But, because polymer molecular weight height, water-insoluble is many, crosslinked and then formed the super large molecule with crosslinking agent, after pressure break finishes, in breaking glue solution, just have quite a few water-insoluble (20-60%) and not the super large molecule of thoroughly broken glue reside in the crack, in-place permeability is descended, construction effect is bad.In addition, in whole fracturing process, the fracturing fluid Admixture is of a great variety, and thickener disperses swelling rate to wait slowly, has had a strong impact on the fracturing fluid quality.It has been recognized that this harm, on broken colloid system and additive, carried out significant improvement, still, improve pressure break at the reduction residue and still produce little effect qualitatively.Though foam fracturing has overcome above-mentioned deficiency, costly because of equipment and liquid, limited its extensive use.
The water-based fracturing liquid system of the novel fracturing fluid system of research and development-low injury also claims not have the reasonable the problems referred to above that solved of polymer fracturing fluid system at present.This system by means of have certain density material (its molecular weight is less than 500g/mol usually, be polymer 1/1000), under the certain environment condition, the characteristic that can form certain viscosity is effectively carried proppant.This system fracturing fluid has not only overcome the deficiency of conventional water-based fracturing liquid system, but also have simplify the pressing crack construction operation, the Admixture kind is few, dosing is convenient, leak-off is little, injury is low, the fracturing fluid stable performance, guaranteed liquid make the seam and take the required viscosity of sand, improved the integral hydraulic fracturing effect.
Novel fracturing fluid system is a kind of in recent years desirable fracturing fluid system, thereby more and more is subjected to people's attention.This fracturing fluid mainly is made up of low molecule long-chain fatty acid derivative quaternary ammonium salt cationic and beet alkali surface activator, salting liquid, activator and stabilizing agent, main effect is to carry proppant, fracturing liquid rubber-breaking returns the basic free of losses of row back main active, contaminated environment again after effluxing.
Summary of the invention
The present invention provides a kind of cleaning fracturing outlet liquid recovery oil displacement and de-plugging treatment process for avoiding the prior art deficiency.
Technical scheme of the present invention is:
A kind of cleaning fracturing outlet liquid recovery oil displacement and de-plugging process comprise the following steps:
1) cleaning fracturing outlet liquid adds flocculant, adhesive mud remover or bactericide and carries out sedimentation of suspension, sterilization through after breaking glue;
2) well-flushing car through filtering function is arranged or the preliminary filtered and recycled of accurate filter, cleaning fracturing outlet liquid suspension content≤10mg/l after treatment; Oil content≤15mg/l;
3) injecting water quality requirement according to every mouthful of well filters through the essence of accurate filter 2 μ m-150 μ m once more;
4) after smart the filtration, in filtered fluid, add biological enzyme formulation 0.1%---0.3% (mass percent)+water, must can be used for the complex oil displacing and the de-plugging agent of oil-water well.
Wherein, the interpolation of chemical agent or the chemical agent of composite indication are meant 0.1%-0.3% biological enzyme formulation (mass percent)+water, and biological enzyme formulation is the compound formulation of the compound formulation of the compound formulation of protease, cellulase, papain or protease, cellulase, papain, opsonigenous substance, bioactivator or protease, cellulase, papain, biological antisludging agent.
The cleaning fracturing outlet liquid rate of recovery through this PROCESS FOR TREATMENT can reach more than 70%, has solved the problem of environmental pollution of fracturing outlet liquid up hill and dale.
Composition oil displacement system that biological enzyme formulation+cleaning fracturing outlet liquid (surfactant properties) is mixed with and underground crude oil can reach the low interfacial tension of 102～10-2mN/m, and the remaining oil in the displacement oil reservoir improves oil recovery factor 6-15% effectively.And have obvious characteristic of environmental protection, can obviously improve the core performance, recover in-place permeability, improve the water-wet effect, strengthen anti-swollen steady sand effect, stop dirt to form deposition once more, reduce oil water interfacial tension, improve oil recovery factor.
The specific embodiment
For further disclosing technical scheme of the present invention, elaborate below:
A kind of cleaning fracturing outlet liquid recovery oil displacement and de-plugging process is characterized in that comprising the following steps:
1) cleaning fracturing outlet liquid adds flocculant, adhesive mud remover or bactericide and carries out sedimentation of suspension, sterilization through after breaking glue;
2) well-flushing car through filtering function is arranged or the preliminary filtered and recycled of accurate filter, cleaning fracturing outlet liquid suspension content≤10mg/l after treatment; Oil content≤15mg/l;
3) injecting water quality requirement according to every mouthful of well filters through the essence of accurate filter 2 μ m-150 μ m once more;
4) after smart the filtration, in filtered fluid, add biological enzyme formulation 0.1% (mass percent)+water, must can be used for the complex oil displacing and the de-plugging agent of oil-water well.
Wherein, said biological enzyme formulation is the compound formulation of protease, cellulase, papain.
The cleaning fracturing outlet liquid rate of recovery through this PROCESS FOR TREATMENT can reach more than 70%.Thoroughly solve problem of environmental pollution.Index contrasted referring to table one before and after the anti-discharge opeing of clean fracturing was reclaimed:
Table one: index contrast before and after the anti-discharge opeing of clean fracturing is reclaimed
| Project | Unit | Before the recovery | Coarse filtration | The smart filtration | Standard (is reference with permeability＞0.6 μ m2) |
| Suspended solids content | ??mg/l | ??2200.0 | ??4.1 | ??0.9 | ??≤5 |
| The SRB bacterium | Individual/ml | ??106 | ??102 | ??21 | ??≤102 |
| Saprophytic bacteria | Individual/ml | ??106 | ??102 | ??0 | ??≤102 |
| A suspension median diameter | ??μm | ??132 | ??1.8 | ??≤3.0 | |
| Oil content | ??mg/l | ??72.8 | ??9.7 | ??1.05 | ??≤10 |
| Total iron content | ??mg/l | ??10.8 | ??0.48 | ??0.35 | ??≤0.5 |
| Sulfide content | ??mg/l | ??8.5 | ??1.9 | ??1.5 | ??＜2.0 |
| Average corrosion rate | ??mm/a | ??0.085 | ??0.069 | ??0.021 | ??≤0.076 |
During the quaternary ammonium salt cationic surfactant displacement of reservoir oil, there is low interfacial tension mechanism in the basic free of losses of fracturing outlet liquid main active of reclaiming, wetting wraparound mechanism and surface electrical behavior wraparound mechanism.When oil displacement agent concentration reached 600mg/l, recovery ratio can improve 5%-6%, the betaine type amphoteric surfac-tant, because this kind surfactant has chelation to metal ion, thereby great majority all can be used for the oil reservoir displacement of reservoir oil of high salinity, higher temperature.This combinations-of surfactants body can reach the low interfacial tension of 101～10-2mN/m, the remaining oil in the displacement oil reservoir effectively separately with underground crude oil.The composition that 0.1% (mass percent) biological enzyme formulation+cleaning fracturing outlet liquid (surfactant) is mixed with can be under the effect of biological enzyme formulation, reduce quaternary ammonium salt cationic surfactant viscosity, strengthen its surface-active, strengthened the clay swell inhibitory action of the fracturing outlet liquid that reclaims.The biological enzyme formulation that adds can destroy the crosslinked polymer chain, and the injury of polymer residue is eliminated in the viscosity reduction degraded.What enzyme was followed is " key principle ", and promptly the principle of " lock of a key " only disconnects glycosidic bond specific in the polysaccharide polymer structure, is the monose and the disaccharides of irreducibility thereby make depolymerization.Adopt organized enzyme can be fast hydrocarbon from solid grain sur-face peeling, and with the skeleton bond fission of high molecular polymer, make it be degraded to low-molecular weight polymer, and can destroy and be close to the polymer long-chain in the mud cake on the borehole wall, thereby mud cake is disposed fast.Destroy oil film, be broken into the little oil droplet of small particle diameter, peel off grease.After the rock core cleaning, make rock core present the strong hydrophilicity feature, stop the grease deposition to form.Low surface tension is eliminated water blocking damage, bacterium injury, the effect that produces influent.Concrete experimental data such as table two:
Table two: the anti-discharge opeing of clean fracturing reclaims to increase increases following index after biology enzyme is handled
| Project | Unit | Before the processing | After the processing |
| Surface tension | ??mN/m | ??34 | ??30.8 |
| Interfacial tension | ??mN/m | ??1.26 | ??0.56 |
| Permeability resume figure | ??％ | ??55 | ??91.8 |
| Permeability ratio | ??0.98 | ??1.28 | |
| Improve recovery ratio | ??％ | ??6 | ??18 |
The composition that this 0.1% (mass percent) biological enzyme formulation+cleaning fracturing outlet liquid (surfactant) is mixed with has obvious characteristic of environmental protection, can ensure under the situation of not having injury, inorganic scale is removed operation, have and eliminate polymer plugging, good anti-swollen and reduce capillary effect.
Claims (2)
- A kind of cleaning fracturing outlet liquid recovery oil displacement and de-plugging process is characterized in that comprising the following steps:
1) cleaning fracturing outlet liquid adds flocculant, adhesive mud remover or bactericide and carries out sedimentation of suspension, sterilization through after breaking glue;2) well-flushing car through filtering function is arranged or the preliminary filtered and recycled of accurate filter, cleaning fracturing outlet liquid suspension content≤10mg/l after treatment; Oil content≤15mg/l;3) injecting water quality requirement according to every mouthful of well filters through the essence of accurate filter 2 μ m-150 μ m once more;4) after smart the filtration, in filtered fluid, add biological enzyme formulation 0.1%---0.3% (mass percent)+water, must can be used for the complex oil displacing and the de-plugging agent of oil-water well. - 2, a kind of cleaning fracturing outlet liquid recovery oil displacement according to claim 1 and de-plugging process is characterized in that biological enzyme formulation is the compound formulation of the compound formulation of the compound formulation of protease, cellulase, papain or protease, cellulase, papain, opsonigenous substance, bioactivator or protease, cellulase, papain, biological antisludging agent.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2009100169381A CN101608543A (en) | 2009-06-30 | 2009-06-30 | A kind of cleaning fracturing outlet liquid recovery oil displacement and de-plugging process |
| CN200910159223A CN101629486A (en) | 2009-06-30 | 2009-07-31 | Clean fracturing flowback fluid recovery, oil displacement and blockage removal process |
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| CNA2009100169381A CN101608543A (en) | 2009-06-30 | 2009-06-30 | A kind of cleaning fracturing outlet liquid recovery oil displacement and de-plugging process |
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| CNA2009100169381A Pending CN101608543A (en) | 2009-06-30 | 2009-06-30 | A kind of cleaning fracturing outlet liquid recovery oil displacement and de-plugging process |
| CN200910159223A Pending CN101629486A (en) | 2009-06-30 | 2009-07-31 | Clean fracturing flowback fluid recovery, oil displacement and blockage removal process |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104498014A (en) * | 2014-12-30 | 2015-04-08 | 中国石油集团川庆钻探工程有限公司工程技术研究院 | Gel breaking liquid based modifying and flooding agent and preparation method thereof |
| CN105565556A (en) * | 2014-10-11 | 2016-05-11 | 中国石油化工股份有限公司 | Flown back fracturing fluid treatment method, flown back fracturing fluid obtained after treatment, and application of flown back fracturing fluid |
| CN106905947A (en) * | 2017-02-08 | 2017-06-30 | 中国石油天然气股份有限公司 | A kind of displacement of reservoir oil fracturing fluid and preparation method and application |
| CN107722957A (en) * | 2017-10-24 | 2018-02-23 | 西安石油大学 | A kind of Application of weak gel profile agent based on cleaning fracturing outlet liquid |
| US20200048990A1 (en) * | 2018-08-13 | 2020-02-13 | Saudi Arabian Oil Company | Systems and Methods for Treating Fluids in Oilfield Facilities |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103160263B (en) * | 2013-03-08 | 2014-12-24 | 中国石油天然气股份有限公司 | Method for preparing base fluid of fracturing fluid by using oil field well site waste water |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4817717A (en) * | 1987-12-28 | 1989-04-04 | Mobil Oil Corporation | Hydraulic fracturing with a refractory proppant for sand control |
| CN1329473C (en) * | 2005-06-17 | 2007-08-01 | 甘肃省庆阳长庆井下化工厂 | Low-molecular environmentally-friendly fracturing fluid and use of recovery liquid thereof |
| CN1766283A (en) * | 2005-11-12 | 2006-05-03 | 东营盛世石油科技有限责任公司 | Fracturing process in oil and water well by means of biological enzyme preparation |
| CN101302065B (en) * | 2008-07-03 | 2010-09-29 | 濮阳市天地人环保工程技术有限公司 | Method for processing oil-gas field fracturing waste liquor |
| CN101475290B (en) * | 2009-01-21 | 2010-10-13 | 大庆油田有限责任公司 | Recovery processing process for fracturing return liquid |
-
2009
- 2009-06-30 CN CNA2009100169381A patent/CN101608543A/en active Pending
- 2009-07-31 CN CN200910159223A patent/CN101629486A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105565556A (en) * | 2014-10-11 | 2016-05-11 | 中国石油化工股份有限公司 | Flown back fracturing fluid treatment method, flown back fracturing fluid obtained after treatment, and application of flown back fracturing fluid |
| CN105565556B (en) * | 2014-10-11 | 2019-01-08 | 中国石油化工股份有限公司 | The fracturing outlet liquid and its application that the processing method of fracturing outlet liquid and processing obtain |
| CN104498014A (en) * | 2014-12-30 | 2015-04-08 | 中国石油集团川庆钻探工程有限公司工程技术研究院 | Gel breaking liquid based modifying and flooding agent and preparation method thereof |
| CN104498014B (en) * | 2014-12-30 | 2018-02-06 | 中国石油集团川庆钻探工程有限公司工程技术研究院 | Profile control agent based on breaking glue solution and preparation method thereof |
| CN106905947A (en) * | 2017-02-08 | 2017-06-30 | 中国石油天然气股份有限公司 | A kind of displacement of reservoir oil fracturing fluid and preparation method and application |
| CN107722957A (en) * | 2017-10-24 | 2018-02-23 | 西安石油大学 | A kind of Application of weak gel profile agent based on cleaning fracturing outlet liquid |
| US20200048990A1 (en) * | 2018-08-13 | 2020-02-13 | Saudi Arabian Oil Company | Systems and Methods for Treating Fluids in Oilfield Facilities |
| US11261705B2 (en) * | 2018-08-13 | 2022-03-01 | Saudi Arabian Oil Company | Systems and methods for treating fluids in oilfield facilities |
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| CN101629486A (en) | 2010-01-20 |
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