CN102174317A - Profile control agent suitable for ASP flooding - Google Patents
Profile control agent suitable for ASP flooding Download PDFInfo
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- CN102174317A CN102174317A CN2011100562560A CN201110056256A CN102174317A CN 102174317 A CN102174317 A CN 102174317A CN 2011100562560 A CN2011100562560 A CN 2011100562560A CN 201110056256 A CN201110056256 A CN 201110056256A CN 102174317 A CN102174317 A CN 102174317A
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Abstract
The invention relates to a profile control agent suitable for alkali-surfactant-polymer (ASP) flooding, which comprises the following components: 2,000mg/L polyacrylamide with the molecular weight of 16,000,000 to 20,000,000 and the hydrolysis degree of 20 to 25 percent, an organic chromium crosslinking agent with the polymerization-crosslinking ratio of 25:1 (W/W), 800mg/L stabilizer thiourea, and the balance of water, wherein the organic chromium crosslinking agent consists of chromium trichloride, sodium hydroxide and lactic acid in a molar ratio of 1:3:3. By the profile control agent, the pressure of an injection well is increased, the relative water absorption ratio of a main water absorption layer is reduced, the producing condition of an oil layer is improved, swept volume is increased, development contradiction is effectively alleviated, the utilization rate of chemical flooding is improved, funds are saved, and the recovery ratio is improved.
Description
Technical field
The present invention relates to the used a kind of auxiliary agent in oil recovery field, oil field, particularly a kind of amendment that is applicable to ternary composite driving.
Background technology
Oil-field development is over 40 years, entered the ultra-high water-containing development stage.The nonuniformity of oil reservoir makes injection system charge into oil well along most permeable zone easily, especially major reservoir, wash away through secular intensification flooding, the oil reservoir pore texture changes violent, a large amount of injection systems is along most permeable zone or the extra-high-speed pervious course is done invalid and the poor efficiency circulation, reduce the water drive swept volume, influenced the oil-field development effect.Polymer flooding depth profile control technology is a pointed important adjustment measure.
Depth profile control technical development general introduction depth profile control technology proposed and grows up in the eighties middle and later periods.Through years of researches and practice, stream and the layer cross flow problem in the layer of finding to exist in the conventional low dose of utilization, the many oil reservoirs of the very difficult solution of immediate vicinity of wellbore Gel Treatment, these problems have had a strong impact on the raising of waterflooding and oil recovery factor, therefore people's depth profile control agent that begins one's study, and the deep profile controlling technology caused extensive attention.The depth profile control technology is mainly handled by heavy dose of deep, and deep and thorough layer generation stopped up to height, changes the back and annotates the fluidic flow direction, increases the displacement of reservoir oil area and the oil displacement efficiency of displacing agent, to improve recovery percent of reserves.Through 10 years of development, handled by individual well and developed into the block integral comprehensive regulation, develop into multiple-limb system by the inorganic particle amendment based on weak gel, enlarged the Application Areas of this research.With stopping up water stream channel behind the chemical profile control agent injection oil reservoir deep, make injection system in oil reservoir, change the flow direction, to improve sweep efficiency, improve oil recovery factor.It is particularly necessary that the depth profile control technology seems in present oil production process, its reason following points: (1) is along with oilfield exploitation enters the middle and later periods, especially after the immediate vicinity of wellbore was repeatedly repeated to transfer and blocked up, oil saturation reduced greatly, needed to use the degree of depth especially and transferred plugging technique.(2) drive in the process in polymer flooding, ternary, when the extra-high-speed pervious course being arranged in the zone of interest, when macropore exists, can occurring that individual layer is advanced by leaps and bounds or the fingering phenomenon, the extraction well is the extraction polymkeric substance prematurely, has reduced the displacement effect that polymkeric substance, ternary are driven.Especially thick oil pay, common shallow accent can't satisfy the needs that improve sweep efficiency, can only cause the fluid diversion of the immediate vicinity of wellbore of short-term, must carry out depth profile control.No matter characteristics such as (3) Chang Gui chemical profile control system is short owing to gelation time, gel-strength is big are on the construction technology, or all can not carry out heavy dose on the economic benefit and handle.Therefore, solve in layer cross flow and the layer and stream phenomenon, must study to be fit to the supporting depth profile control technology of heavy dose of cheap amendment that injects.During " eight or five ", China's depth profile control technology begins to take shape, and has formed two kinds of main Technologies, i.e. heavy dose of depth profile control technology of particulate species and deferred class cross-linked polymer deep profile controlling technology.The heavy dose of depth profile control technology of so-called particulate species is to adopt cheap inorganic particle, injects the purpose that reaches the deep fluid changed course by heavy dose.The retarding crosslinked system that China grows up is by the type of the linking agent cross-linking system that can be divided three classes: a class be can with organic aldehydes linking agent of acid amides machine group effect in the water-soluble polymers molecule; Another kind of be with polymer molecule in the transition metal organic crosslinking agent of hydroxy-acid group effect; The 3rd class is that the former two is used simultaneously.The basic thought of the second class linking agent is by selecting different linking agents to come controlling reaction time, thereby prolongation gelation time, at present about more with the linking agent of polyacrylamide formation gel, the organic zirconium linking agent is wherein arranged, the organoaluminum linking agent, organic chromium linking agent etc., the gel-strength of organic zirconium linking agent and polymer formation a little less than, the less stable of the gel of organoaluminum linking agent and polymer formation, by detailed investigation of related literatures and indoor preliminary experiment screening, find that organic chromium linking agent and polymkeric substance are in the intensity that forms gel, aspects such as control gelation time and price are compared with other linking agent has remarkable advantages.Selected organic chromium and polymkeric substance synthetic amendment.The main raw material that linking agent is chosen is chromium trichloride, lactic acid, main component with the partially hydrolyzed polyacrylamide reaction in the linking agent is a chromium ion, chromium ion and the effect of HPAM hydroxyl form has the system of tridimensional network, has higher viscosity, can carry out effective shutoff to most permeable zone.Complexing agent adds in the linking agent, forms complex compound with chromium ion, controls the release rate of chromium ion in the cross-linking system, controls the reaction times of linking agent to a certain extent, to satisfy the on-the-spot condition of injecting.
Summary of the invention
The purpose of this invention is to provide a kind of amendment that is applicable to ternary composite driving, adopt this amendment injection well pressure rising, main water accepting layer suction ratio relatively decline, oil reservoir producing status to improve, enlarged swept volume, exploitation contradiction is effectively alleviated, improved the utilization ratio of chemical flooding, promptly save fund, improved recovery ratio again.
The technical solution adopted in the present invention is: this is applicable to that the amendment of ternary composite driving comprises following component, each component is the proportioning meter by mass percentage: concentration is the polyacrylamide of 2000 mg/L, Molecular Weight for Polyacrylamide is 1600-2000 ten thousand, and degree of hydrolysis is 20%-25%; The organic chromium linking agent, poly-double ratio 25:1(W/W); Concentration is the stablizer thiocarbamide of 800 mg/L; And the water of surplus; Wherein the organic chromium linking agent is made up of chromium trichloride, sodium hydroxide and ammonium lacate mol ratio 1:3:3.
Technique effect of the present invention is: the rock core sealing ratiod of using the different rate of permeation of the present invention is all more than 95%; The chromium ion amendment has stronger abrasion resistance energy, and after waterflood flush 5PV, sealing ratiod still remains on about 90%.In addition, when heterogeneous reservoir injected this amendment, amendment at first entered most permeable zone, and is strong to the selectively blocking off ability of macropore, low permeability reservoir then only had on a small quantity enter, and injures lighter.All reached requirement at aspects such as quality, safety and environmental protection.By field experiment, injection well pressure rises, main water accepting layer suction ratio relatively descends, the oil reservoir producing status improves, and has enlarged swept volume, exploitation contradiction is effectively alleviated, improve the utilization ratio of chemical flooding, promptly saved fund, improved recovery ratio again.According to 50.0 ten thousand yuan of individual well profile control expenses, the average individual well accumulative total of prediction profile control well increases 1000 tons of oil, if crude oil price by 1700 yuan of/ton calculating, obtains 1,750,000 yuan of direct economic benefits, input-output ratio is 1:3.5.
Embodiment:
Below by embodiment the present invention is specifically described.The used organic chromium gel-type amendment of following experiment is: concentration is the polyacrylamide of 2000 mg/L, and Molecular Weight for Polyacrylamide is 1600-2000 ten thousand, and degree of hydrolysis is 20%-25%; The organic chromium linking agent, poly-double ratio 25:1(W/W); Concentration is the stablizer thiocarbamide of 800 mg/L; And the water of surplus; Wherein the organic chromium linking agent is made up of chromium trichloride, sodium hydroxide and ammonium lacate mol ratio 1:3:3.
Several amendment contrast tables 1
| Classification | Clear water preparation compound ion amendment | Sewage preparation compound ion amendment | Water carries precrosslink volume expansion grain amendment | Polymkeric substance carries precrosslink volume expansion grain amendment | Organic chromium gel-type amendment |
| Environment for use | Clear water | Clear water, sewage | Clear water, sewage | Clear water, sewage | Clear water, sewage |
| Advantage | Comparative maturity, effect are better | Mature technology there is inheritance preferably | Influence, the process for preparation that is not injected water is simple, cost is low, be applicable to macropore, the crack | Do not injected water influence, section is had a better role, be applicable to macropore, crack | Comparative maturity, effect are better, to inject the steady validity period of easy performance of profile modification longer |
| Shortcoming | Cost is too high, be not suitable for the sewage environment | Cost height, profile control system are higher to injection device seriously corroded, maintenance cost | The tax carrying capacity is weak, particle is piled up in the immediate vicinity of wellbore and obstruction easily, causes follow-up injection difficulty | Carry with polymkeric substance, cost increases to some extent, but working lipe is shorter | ? |
| Average single well chemical agent expense (ten thousand yuan) | 62 | 72.7 | 45.0 | 48.5 | 50.0 |
By above contrast table 1 as can be seen, the advantage that has than other several amendments of organic chromium gel-type amendment
The experiment that organic chromium gel-type amendment of the present invention influences the ternary interfacial tension:
At the indoor three-component compound system of having prepared, polymer concentration 1650 mg/L, alkali are 1.2% (mass percent) according to Xing Bei trial plot practical situation, and table agent effective concentration alive is respectively 0.05%, 0.10%, 0.20%, 0.30% (mass percent).Guaranteeing that table lives under the constant situation of agent and alkali concn, chromium ion amendment of the present invention is joined respectively in the three-component compound system, detect whole system respectively in the time of 1 day, 3 days, 5 days, 7 days, 15 days and the interfacial tension of crude oil.Testing data shows that after chromium ion amendment and ternary system were mixed, rear interface tension force still can reach 1.0 * 10 in 15 days
-3(seeing Table 2).The interfacial tension not obviously influence of chromium ion amendment to three-component compound system has been described.
Ternary system and the chromium ion amendment rear interface tension force that is mixed detects data sheet (mN/m) table 2
Ternary liquid soaks the influence experiment to gellifying property of the present invention:
In order to investigate the compatibleness of chromium ion amendment and ternary system, this system after 10 days gelatigenous viscosity be 22530mPa.s.Chromium ion amendment behind the one-tenth glue is put into ternary system soak, the prescription of ternary system is 1650mg/L for polymer concentration, and table agent concentration alive is 0.3%, and alkali concn is 1.2%.Mixed solution is placed in 45 ℃ of baking ovens, and the viscosity of results of regular determination amendment and pH value are observed the variation of mixed solution.It is 20840mPa.s that the viscosity of different time and pH value see Table 3,30 days viscosity, and the pH value is 12.5, and outward appearance does not have too big variation, illustrates that this amendment and ternary system compatibleness are better, helps the ternary composite driving profile control.
Ternary is soaked gel experimental result table 3
The present invention has tested more than 90 mouthful of well altogether in Daqing oil field Xing Bei development area, has obtained obvious effects.
The profile control technique input profile improves situation contrast table 4
Profile control technique improves injection situation contrast table 5
Profile control zone of interest production profile change list 6
Claims (1)
1. amendment that is applicable to ternary composite driving, comprise following component: concentration is the polyacrylamide of 2000 mg/L, and Molecular Weight for Polyacrylamide is 1600-2000 ten thousand, and degree of hydrolysis is 20%-25%; The organic chromium linking agent, poly-double ratio 30:1(W/W); Concentration is the stablizer thiocarbamide of 800 mg/L; And the water of surplus; Wherein the organic chromium linking agent is made up of chromium trichloride, sodium hydroxide and ammonium lacate mol ratio 1:3:3.
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| CN2011100562560A CN102174317A (en) | 2011-03-09 | 2011-03-09 | Profile control agent suitable for ASP flooding |
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| CN2011100562560A CN102174317A (en) | 2011-03-09 | 2011-03-09 | Profile control agent suitable for ASP flooding |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104234676A (en) * | 2014-08-28 | 2014-12-24 | 中国石油天然气股份有限公司 | Method for deep profile control by utilizing ASP (alkaline/surfactant/polymer) combination flooding produced sewage |
| CN104263337A (en) * | 2014-09-26 | 2015-01-07 | 中国石油天然气股份有限公司 | In-depth profile controlling agent for medium temperature oil deposit three compound combination flooding |
| CN104371680A (en) * | 2014-10-13 | 2015-02-25 | 中国石油天然气股份有限公司 | Depth profile control agent applicable to low permeability oilfield wastewater reinjection |
| WO2016084032A1 (en) * | 2014-11-28 | 2016-06-02 | Ecopetrol S.A. | Formulations of colloidal dispersion gels and surfactants for the improved recovery of petroleum and method of obtaining these formulations |
| CN106634879A (en) * | 2016-12-22 | 2017-05-10 | 石家庄华莱鼎盛科技有限公司 | Bionic nanometer blocking agent for drilling fluid and preparation method thereof |
| CN108130063A (en) * | 2017-12-30 | 2018-06-08 | 周益铭 | A kind of preparation method of water plugging profile control agent |
| CN111892918A (en) * | 2020-08-27 | 2020-11-06 | 胜利油田盛嘉化工有限责任公司 | Jelly water shutoff profile control agent and preparation method thereof |
| CN113969761A (en) * | 2020-07-24 | 2022-01-25 | 中国石油化工股份有限公司 | Periodic profile control and flooding method for ultrahigh water-cut oil reservoir |
| CN115873569A (en) * | 2022-09-21 | 2023-03-31 | 中国石油化工股份有限公司 | Gel formation accelerant for profile control agent and application of gel formation accelerant in gel profile control agent |
| CN116044391A (en) * | 2023-03-09 | 2023-05-02 | 西南石油大学 | Method for determining dosage of profile control agent of low permeability reservoir horizontal well |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104234676A (en) * | 2014-08-28 | 2014-12-24 | 中国石油天然气股份有限公司 | Method for deep profile control by utilizing ASP (alkaline/surfactant/polymer) combination flooding produced sewage |
| CN104263337A (en) * | 2014-09-26 | 2015-01-07 | 中国石油天然气股份有限公司 | In-depth profile controlling agent for medium temperature oil deposit three compound combination flooding |
| CN104371680A (en) * | 2014-10-13 | 2015-02-25 | 中国石油天然气股份有限公司 | Depth profile control agent applicable to low permeability oilfield wastewater reinjection |
| WO2016084032A1 (en) * | 2014-11-28 | 2016-06-02 | Ecopetrol S.A. | Formulations of colloidal dispersion gels and surfactants for the improved recovery of petroleum and method of obtaining these formulations |
| CN106634879A (en) * | 2016-12-22 | 2017-05-10 | 石家庄华莱鼎盛科技有限公司 | Bionic nanometer blocking agent for drilling fluid and preparation method thereof |
| CN106634879B (en) * | 2016-12-22 | 2017-10-17 | 石家庄华莱鼎盛科技有限公司 | Drilling fluid bionic nano sealing agent and preparation method thereof |
| CN108130063A (en) * | 2017-12-30 | 2018-06-08 | 周益铭 | A kind of preparation method of water plugging profile control agent |
| CN113969761A (en) * | 2020-07-24 | 2022-01-25 | 中国石油化工股份有限公司 | Periodic profile control and flooding method for ultrahigh water-cut oil reservoir |
| CN111892918A (en) * | 2020-08-27 | 2020-11-06 | 胜利油田盛嘉化工有限责任公司 | Jelly water shutoff profile control agent and preparation method thereof |
| CN115873569A (en) * | 2022-09-21 | 2023-03-31 | 中国石油化工股份有限公司 | Gel formation accelerant for profile control agent and application of gel formation accelerant in gel profile control agent |
| CN116044391A (en) * | 2023-03-09 | 2023-05-02 | 西南石油大学 | Method for determining dosage of profile control agent of low permeability reservoir horizontal well |
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Application publication date: 20110907 |