CN101067078A - Sandstone matrix acidifying solution - Google Patents
Sandstone matrix acidifying solution Download PDFInfo
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- CN101067078A CN101067078A CN 200710088856 CN200710088856A CN101067078A CN 101067078 A CN101067078 A CN 101067078A CN 200710088856 CN200710088856 CN 200710088856 CN 200710088856 A CN200710088856 A CN 200710088856A CN 101067078 A CN101067078 A CN 101067078A
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Abstract
The sandstone matrix acidifying solution for increasing yield of conventional sandstone oil well and weight injecting well stimulation consists of complex phosphonic acid-sulfonic acid 4-6 wt%, ammonium bifluoride 4-7 wt%, XS-01 phosphonic acid corrosion inhibitor 0.3-0.5 wt%, NTS-2 ferric ion stabilizer 1-2 wt%, JS-7 clay stabilizer 1-2 wt%, ethylene glycol monobutyl ether 1-3 wt%, XBS-919 cleanup additive 0.1- 0.3 wt% and water 79.2-88.6 wt%. The sandstone matrix acidifying solution is superior to conventional acid solution, and has simple site construction and wide application range.
Description
Technical field
The present invention relates to the oil production technical field of chemistry, particularly relate to a kind of acidizing fluid in the oil and water well acidification technical field.
Background technology
At present, the acid solution of oilfield oil well acidification use both at home and abroad mainly is hydrochloric acid-hydrofluoric acid (being mud acid), gelled acid, nitric acid.Utilize the chemical corrosion of acid solution, rock forming mineral, tamper in the dissolving stratum, mediation stratum pore throat passage to recover and to improve the rate of permeation on stratum, reduces oil and flows into well resistance or water filling resistance, thereby reaches the purpose of oil well production increasing, intensified injection of wells.As the Chinese patent publication number be 1528854 and publication number be 1488704 patent, adopt configuration acidizing fluids such as nitric acid exactly.Rig-site utilization shows, the acid of these acid solutions-rock speed of response is fast, EFFECTIVE RANGE is short, the matrix correctional effect is poor, acid solution is higher than corrosion rate to quartz to the corrosion rate of clay, excessively to the corrosion of stratum clay cement, easily causes near wellbore formation to cave in, cause formation sand production, and acid solution is stronger to oil well production string corrodibility.
Summary of the invention
The objective of the invention is to: provide a kind of matrix to transform the sandstone matrix acidifying solution that good, the slow performance of performance is good, clay had low corrosion rate.Reduce acid-rock speed of response, increase EFFECTIVE RANGE, improve the matrix correctional effect; Improve the corrosion rate of acid solution, reduce corrosion, overcome near wellbore formation and cave in clay cement to quartz; This acid solution to flow string corrodibility a little less than, the protection oil well pipe prolongs the oil well pipe life-span.
Technical scheme of the present invention is: a kind of sandstone matrix acidifying solution, and its formulation weight ratio is: by 4～6% organic multicomponent phosphono and sulfonics; 4～7% ammonium bifluorides; 0.3～0.5%XS-01 phosphonic acids inhibiter; 1～2%NTS-2 Fe stabilizer; 1～2%JS-7 clay stabilizer; 1～3% ethylene glycol monobutyl ether; 0.1～0.3%XBS-919 cleanup additive and 79.2～88.6% water are formed.Compound method is fairly simple.Water with calculated amount adds in the dosing pond earlier, under normal temperature, agitation condition, add respectively calculated amount by organic multicomponent phosphono and sulfonic, ammonium bifluoride, XS-01 phosphonic acids inhibiter, NTS-2 Fe stabilizer, JS-7 clay stabilizer, ethylene glycol monobutyl ether, XBS-919 cleanup additive and water, after mixing, the tank car of packing into is standby.At the construction field (site), the acidizing treatment construction technology is clamp-oned the well in operation stratum with this acidizing fluid routinely, through closing well, acid discharge, well cleanout and reverse cleanout, well is returned to normal production.The starting material that sandstone matrix acidifying solution of the present invention adopted all can have been bought on market or by factory.
The beneficial effect that this sandstone matrix acidifying solution produces is: 1. utilize the parcel performance of organic multicomponent phosphono and sulfonic to clay, compare the corrosion that has reduced clay with mud acid, make a large amount of acid solutions and quartz reaction, raising (is compared with mud acid the corrosion rate of quartz, improved 60%), raising has improved the seepage channel on stratum to the matrix transformation effect on stratum, and is effective; 2. utilize 5 grades of ionization H of organic multicomponent phosphono and sulfonic
+Progression, the slow performance of raising acid solution, acid-rock effective reaction time can reach 48 hours (mud acid acid-rock effective reaction time only has 0.5 hour), has reduced speed of response, has increased the EFFECTIVE RANGE of acid solution; 3. little to flow string corrodibility, corrosion speed 2.31g/m
2.h (90 ℃, normal pressure).Can effectively solve the conventional middle and high sandstone reservoir difficult water injection well stimulation that repeatedly acidifying is invalid, low porosity and low permeability hydrocarbon-bearing pool water injection well of oozing annotates not advance and an oil field injection yield-increasing technology difficult problem such as oil well production increasing.Site operation is simple, and strong operability can be constructed with complete sets of Techniques such as segmentation acidifying, stifled acidifyings temporarily, has wide range of applications.
Description of drawings
Fig. 1 is the ionization curve figure of organic multicomponent phosphono and sulfonic
Embodiment
Performance to this sandstone matrix acidifying solution in the laboratory is tested respectively.Test process is as follows:
1, test the corrosion ability of this acid solution: the organic multicomponent phosphono and sulfonic that under agitation adds 4g to quartz or clay, the 4g ammonium bifluoride, 0.3g XS-01 phosphonic acids inhibiter, 1g NTS-2 Fe stabilizer, 1g JS-7 clay stabilizer, the 1g ethylene glycol monobutyl ether, 0.1g XBS-919 cleanup additive, 88.6g water, to be mixed evenly after, add 5g quartz or clay (tolerance range 0.001g), 90 ℃, normal pressure isothermal reaction 4 hours, take out, filter with quantitative paper, clean up, put into 105 ℃ of thermostat container constant temperature 2 hours, put into moisture eliminator again and carry out drying, reach room temperature to sample temperature, carry out weighing (tolerance range 0.001g), calculate the corrosion amount (g) of acid to quartz or clay, divided by the original weight (g) of quartz or clay, obtain the corrosion rate (%) of acid solution at last to quartz or clay, judge the corrosion ability of acid solution to quartz or clay.
Sandstone matrix acidifying solution prescription and experimental result
| Example | 1 | 2 | 3 |
| Organic multicomponent phosphono and sulfonic (g) | 4 | 5 | 6 |
| Ammonium bifluoride (g) | 4 | 5 | 7 |
| XS-01 phosphonic acids inhibiter (g) | 0.3 | 0.4 | 0.5 |
| NTS-2 Fe stabilizer (g) | 1 | 1.5 | 2 |
| JS-7 clay stabilizer (g) | 1 | 1.5 | 3 |
| Ethylene glycol monobutyl ether (g) | 1 | 2 | 3 |
| XBS-919 cleanup additive (g) | 0.1 | 0.2 | 0.3 |
| Water (g) | 88.6 | 84.4 | 78.2 |
| To quartz dissolution rate (%) | 33.6 | 35.95 | 39.98 |
| To clay dissolution rate (%) | 19.94 | 22.19 | 26.15 |
2, the ionization H of test organic multicomponent phosphono and sulfonic
+Progression: according to GB GB601, configuration 0.5N standard solution of sodium hydroxide.Under agitation condition, add the organic multicomponent phosphono and sulfonic of 1g, and add 99g water, dispose 1% organic multicomponent phosphono and sulfonic solution.Pipette the 1% organic multicomponent phosphono and sulfonic solution that configures in right amount with transfer pipet, put into the 200ml beaker of being furnished with magnetic stirring apparatus and acidometer, with the centinormal 1 standard solution of sodium hydroxide titration of 0.5N organic multicomponent phosphono and sulfonic, turn on agitator and acidometer, whenever spend the 1ml standard solution of sodium hydroxide, just note pH value at that time, till titration to pH value no longer rises.With used sodium hydroxide volume (milliliter) number is X-coordinate, is ordinate zou with the pH value, draws out the ionization curve (seeing accompanying drawing 1) of organic multicomponent phosphono and sulfonic, just can judge the ionization H of this organic multicomponent phosphono and sulfonic according to ionization curve
+Progression.Raise with the sodium hydroxide volume, pH value rises, and judges the ionization H of organic multicomponent phosphono and sulfonic according to pH value rising numbers of steps
+Progression, 1 rising step of every appearance characterizes 1 ionization progression, and 5 rising steps signs occurring 5 ionization H
+Progression.
3, test the slow ability of this acid solution: the organic multicomponent phosphono and sulfonic that under agitation adds 4g, the 6g ammonium bifluoride, 90g water, to be mixed evenly after, add 5g (tolerance range 0.001g) landwaste, be heated to 90 ℃, the normal pressure isothermal reaction, respectively by 0.5,1,4,10,16,32,36,44, took out in 48 hours, filter with quantitative paper respectively, put into 105 ℃ of thermostat container constant temperature of constant temperature 2 hours, put into moisture eliminator again and carry out drying, reach room temperature to sample temperature, carry out weighing (tolerance range 0.001g), calculate the corrosion amount (g) of acid, divided by the original weight (g) of landwaste to landwaste, obtain the corrosion rate (%) of acid solution at last, judge the slow ability of acid solution the landwaste different time.
The sandstone matrix acidifying solution prescription is formed and experimental result
| Reaction times h | 0.5 | 1 | 4 | 10 | 16 | 32 | 36 | 44 | 48 |
| Corrosion rate % | 14.76 | 16.29 | 24.18 | 31.22 | 35.48 | 43.44 | 46.01 | 47.85 | 48.3 |
| Prescription is formed | 6g ammonium bifluoride+4g organic multicomponent phosphono and sulfonic+90g water | ||||||||
4, test this acidizing fluid corrosive nature: under agitation add 4g organic multicomponent phosphono and sulfonic, 6g ammonium bifluoride, 0.3gXS-01 phosphonic acids inhibiter, 89.7g water, according to the SY/T5405-1996 standard, carry out the Evaluation of Corrosion Resistance of sandstone matrix acidifying solution, the experimental result corrosion speed is 2.31g/m
2.h (normal pressure, 90 ℃).
Draw by laboratory experiment: this acid solution reaches 39.98% to quartz dissolution, and the clay dissolution rate is reached 26.15%; And have 5 grades of ionization H
+Performance, the slow time can reach 48 hours; Corrosion speed is 2.31g/m
2.h.
Rig-site utilization example: at first,, then calculate the consumption of required each component in the aforementioned formula ratio according to the total amount of layer position thickness, porosity and the required acidizing fluid of acidifying radius calculation of intending enforcement acidizing treatment well.The 5% organic multicomponent phosphono and sulfonic, 5% ammonium bifluoride, 0.4%XS-01 phosphonic acids inhibiter, 1.5%NTS-2 Fe stabilizer, 1.5%JS-7 clay stabilizer, 2% ethylene glycol monobutyl ether, 0.2%XBS-919 cleanup additive, 84.4% water that under agitation condition, add calculated amount during dosing respectively in the dosing pond, after mixing, install to special-purpose acid tank truck, with 700 type fracturing trucks institute's complex acid liquid is clamp-oned the well in operation stratum, closing well reaction acid discharge after 12～24 hours, up to the liquid effluent pH value near 7, in big two weeks of discharge capacity anti-flushing well of water, in time produce on request.
This sandstone matrix acidifying solution is mainly used in the conventional sandstone formation water injection well stimulation in oil field, oil well production increasing.Through the inferior test of on-the-spot 15 wells, obtained increasing yield and injection effect relatively, accumulative total augmented injection 188048m
3, the corresponding oil well accumulative total of measure water injection well increases oily 10344.94t, 282 days average effective phases, and 648.7 ten thousand yuan of the wound output values, 750,000 yuan of deduction construction cost, materials cost have a net increase of 573.7 ten thousand yuan of economic benefits.
Claims (2)
1. sandstone matrix acidifying solution, be mainly used in the oil and water well acidification, be composited by organic multicomponent phosphono and sulfonic, ammonium bifluoride, auxiliary agent and water, it is characterized in that: each component and weight percent thereof are: 4～6% organic multicomponent phosphono and sulfonics, 4～7% ammonium bifluorides, 0.3～0.5%XS-01 phosphonic acids inhibiter, 1～2%NTS-2 Fe stabilizer, 1～2%JS-7 clay stabilizer, 1～3% ethylene glycol monobutyl ether, 0.1～0.3%XBS-919 cleanup additive, 79.2～88.6% water.
2. sandstone matrix acidifying solution as claimed in claim 1 is characterized in that: each component and weight percent thereof are: 5% organic multicomponent phosphono and sulfonic, 5% ammonium bifluoride, 0.4%XS-01 phosphonic acids inhibiter, 1.5%NTS-2 Fe stabilizer, 1.5%JS-7 clay stabilizer, 2% ethylene glycol monobutyl ether, 0.2%XBS-919 cleanup additive, 84.4% water.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101781982A (en) * | 2010-02-25 | 2010-07-21 | 中国石油化工股份有限公司 | Short-injection water injection well acidation injectivity process |
| CN101538461B (en) * | 2009-04-30 | 2011-01-12 | 中国石油天然气股份有限公司 | Pressure reducing and injection increasing agent used for flooding well and preparation method thereof |
| CN101285378B (en) * | 2008-05-09 | 2012-02-01 | 大庆汇联技术开发有限公司 | Activator composite plug removal technology |
| CN102604619A (en) * | 2012-02-07 | 2012-07-25 | 中国石油天然气股份有限公司 | Protective agent for chlorite membrane on oil reservoir pore surface |
| CN102899013A (en) * | 2011-07-29 | 2013-01-30 | 中国石油天然气股份有限公司 | Clastic sandstone gas reservoir acidizing fluid |
| CN104629712A (en) * | 2013-11-15 | 2015-05-20 | 中国石油天然气股份有限公司 | Deep acidizing acid liquor and deep acidizing method of low-permeability sandstone reservoir |
| CN114426836A (en) * | 2020-10-29 | 2022-05-03 | 中国石油化工股份有限公司 | Near-neutral working fluid for improving permeability of high-temperature sandstone reservoir and preparation method thereof |
-
2007
- 2007-03-24 CN CN 200710088856 patent/CN101067078A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101285378B (en) * | 2008-05-09 | 2012-02-01 | 大庆汇联技术开发有限公司 | Activator composite plug removal technology |
| CN101538461B (en) * | 2009-04-30 | 2011-01-12 | 中国石油天然气股份有限公司 | Pressure reducing and injection increasing agent used for flooding well and preparation method thereof |
| CN101781982A (en) * | 2010-02-25 | 2010-07-21 | 中国石油化工股份有限公司 | Short-injection water injection well acidation injectivity process |
| CN102899013A (en) * | 2011-07-29 | 2013-01-30 | 中国石油天然气股份有限公司 | Clastic sandstone gas reservoir acidizing fluid |
| CN102604619A (en) * | 2012-02-07 | 2012-07-25 | 中国石油天然气股份有限公司 | Protective agent for chlorite membrane on oil reservoir pore surface |
| CN102604619B (en) * | 2012-02-07 | 2013-09-04 | 中国石油天然气股份有限公司 | Protective agent for chlorite membrane on oil reservoir pore surface |
| CN104629712A (en) * | 2013-11-15 | 2015-05-20 | 中国石油天然气股份有限公司 | Deep acidizing acid liquor and deep acidizing method of low-permeability sandstone reservoir |
| CN114426836A (en) * | 2020-10-29 | 2022-05-03 | 中国石油化工股份有限公司 | Near-neutral working fluid for improving permeability of high-temperature sandstone reservoir and preparation method thereof |
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