CN102877820A - Method for reducing water injection pressure of reservoir well - Google Patents
Method for reducing water injection pressure of reservoir well Download PDFInfo
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- CN102877820A CN102877820A CN2011101986211A CN201110198621A CN102877820A CN 102877820 A CN102877820 A CN 102877820A CN 2011101986211 A CN2011101986211 A CN 2011101986211A CN 201110198621 A CN201110198621 A CN 201110198621A CN 102877820 A CN102877820 A CN 102877820A
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Abstract
The invention relates to a method for reducing water injection pressure of a reservoir well. The method comprises the following steps of: 1, displacing 1 to 2 cubes of cleaning fluid, closing the well, reacting for 50 minutes, cleaning a shaft, an oil pipe and hole impurities, and displacing residual acid out of the shaft; 2, injecting a first front acid slug in a volume which is one time the volume of the shaft; 3, injecting a second main body acid slug in a volume which is twice the volume of the shaft by positive extrusion; 4, injecting a third rear acid slug in a volume which twice the volume of the shaft by positive extrusion; and 5, injecting a fourth surfactant slug in a volume which is 5 to 6 times the volume of the shaft by positive extrusion, wherein the concentration of the surfactant is 0.15 to 0.05 percent, and the balance is clean water. The water injection pressure of the ultra low-seepage compact water injection well is reduced through a comprehensive effect formed by different acting mechanisms of four slugs.
Description
Technical field:
The present invention relates to a kind of method that reduces Oil in Super-low Permeability compact reservoir well water injection pressure.
Background technology:
At present, long celebrating ultra-low penetration oil reservoir development zone is wide, straticulate exploration is many, reservoir characteristic is complicated, and water filling is the key of ultra-low penetration oil reservoir economical and effective exploitation.In the extensive upper product process, find that part block water injection pressure is high, can not satisfy the injection allocation requirement, adopt conventional single acidifying increase water injection technology, such as conventional mud acid, retarded acid, continuously acid, spontaneous weak acid, many hydracids etc., augmented injection DeGrain.
Summary of the invention:
The purpose of this invention is to provide a kind of method that reduces reservoir well water injection pressure, to adopt five steps specifically, inject four different liquid slug, the comprehensive effect that the different mechanisms of action by four slugs form reduces the water injection pressure of the fine and close water injection well of Oil in Super-low Permeability that conventional well stimulation is difficult to prove effective.
A kind of method that reduces reservoir well water injection pressure of the present invention, to adopt five steps specifically, inject four different liquid slug, the comprehensive effect that the not same-action by four slugs forms reduces the water injection pressure of the water injection well that conventional well stimulation is difficult to prove effective, and it is characterized in that:
The first step is just being replaced cleaning fluid, liquid measure 1-2 side, and closing well reaction 50min cleans pit shaft, oil pipe and eyelet impurity, and pit shaft is replaced out in residual acid;
Second step injects the first preposition sour slug, and liquid measure is 1 times of hole volume;
The 3rd step was just squeezing into the second main acid slug, and liquid measure is 2 times of hole volumes;
The 4th step was just squeezing into the 3rd rearmounted sour slug, and liquid measure is 2 times of hole volumes;
The 5th step was just squeezing into the 4th ultralow interfacial tension surfactant slug, and liquid measure is 5-6 times of hole volume, and surfactant concentration is 0.15%-0.05%, and all the other are clear water;
Described cleaning fluid is: 7-8% hydrochloric acid, and the 2-4% glacial acetic acid, the 2-4% composite additive, 2-4% ammonium chloride, all the other are clear water.
Described preposition acid is: 11-13% hydrochloric acid, and the 2-4% glacial acetic acid, the 2-4% composite additive, 2-4% ammonium chloride, all the other are clear water.
Described main acid is: 11-13% hydrochloric acid, and the 4-6% glacial acetic acid, 1-3% hydrofluoric acid, the 2-4% composite additive, 2-4% ammonium chloride, all the other are clear water.
Described rearmounted acid is: 11-13% hydrochloric acid, and the 2-4% glacial acetic acid, the 2-4% composite additive, 2-4% ammonium chloride, all the other are clear water.
Described ultralow interfacial tension surfactant preparation method: select the low solidifying cycloalkyl vacuum distillate in Xinjiang to be raw material, SO 3 sulfonated with gas; Take 1000 milliliters of there-necked flasks that agitator, thermometer are housed as the sulfonating reaction bottle, put into 500-650 gram fraction oil, agitating heating is warming up to 60 ℃, be weighed into required sulfan amount with 500 milliliters of there-necked flasks that thermometer is housed in addition, the mass ratio of oil and sulfur trioxide is 1: 1.4, and water bath heat preservation is with the generation of control sulfur trioxide gas; The air drying of air steel cylinder also enters in the sulfur trioxide bottle by after the gas flowmeter metering, and sulfur trioxide is blown out gradually, and the gas that blows out imports the sulfonating reaction bottle until the sulfur trioxide total overall reaction is complete after surge flask is heated to 60-70 ℃; Continue to react half an hour in 60C, stop to stir; Insulation sedimentation half an hour, emit unreacted oil and mahogany acid, be neutralized to pH7-7.5 with quality 20% sodium hydrate aqueous solution at 60 ℃ under constantly stirring, add 300 milliliters of quality 50% ethanol/water solution extractions, get petroleum sulfonate, separate after the placement layering, evaporate to dryness alcohol water layer namely gets product.
Described composite additive is: the compound of clay stabilizer, cleanup additive and ferrous stability, specifically form 20% clay stabilizer, 30% cleanup additive, 20% ferrous stability, and all the other are clear water.
Described clay stabilizer is: small cation quaternary ammonium salt, product designation COP-1, molecular weight 500-600, manufacturer Xi'an long celebrating Chemical Group Co., Ltd.
Described cleanup additive: fluorocarbon surfactant, product designation CF-5D, manufacturer Xi'an long celebrating Chemical Group Co., Ltd.
Described ferrous stability is: TGA.
The invention characteristics:
The present invention is a kind of hypotonic compact reservoir step-down augmented injection method that is fit to, to adopt five steps specifically, inject four different liquid slug, the comprehensive effect that not same-action by four slugs forms reduces the water injection pressure of the water injection well that conventional well stimulation is difficult to prove effective, it is characterized in that: the first step is just being replaced cleaning fluid, liquid measure 1-2 side, closing well reaction 50min, clean pit shaft, oil pipe and eyelet impurity, pit shaft is replaced out in residual acid; Second step is just squeezing into the first preposition sour slug, and liquid measure is 1 times of hole volume; The 3rd step was just squeezing into the second main acid slug, and liquid measure is 2 times of hole volumes; The 4th step was just squeezing into the 3rd rearmounted sour slug, and liquid measure is 2 times of hole volumes; The 5th step was just squeezing into the 4th ultralow interfacial tension surfactant slug, and liquid measure is 5-6 times of hole volume, and surfactant concentration is 0.05%-0.15%.
The present invention is in the technical innovation of carrying out three aspects: of fracturing fluid.
1, newly-increased injecting method
A cleaning fluid adds three variable concentrations acid slugs, the augmented injection method of last surfactant slug.
2, three new slug prescriptions
Preposition acid: 11%-13% hydrochloric acid, 2%-4% glacial acetic acid, 2%-4% composite additive, 2%-4% ammonium chloride.
Main acid: 11%-13% hydrochloric acid, 4%-6% glacial acetic acid, 1%-3% hydrofluoric acid, 2%-4% composite additive, 2%-4% ammonium chloride.
Rearmounted acid: 11%-13% hydrochloric acid, 2%-4% glacial acetic acid, 2%-4% composite additive, 2%-4% ammonium chloride.
3, novel surfactant
Researched and developed a new nonionic surfactant, had ultralow interfacial tension, mass fraction is that 0.15% the aqueous solution and the interfacial tension of aviation kerosine are 0.021mN/m, and the specific performance index sees attached list 1.Described ultralow interfacial tension surfactant preparation method: select the low solidifying cycloalkyl vacuum distillate in Xinjiang to be raw material, SO 3 sulfonated with gas; Take 1000 milliliters of there-necked flasks that agitator, thermometer are housed as the sulfonating reaction bottle, put into 500-650 gram fraction oil, agitating heating is warming up to 60 ℃, be weighed into required sulfan amount with 500 milliliters of there-necked flasks that thermometer is housed in addition, the mass ratio of oil and sulfur trioxide is 1: 1.4, and water bath heat preservation is with the generation of control sulfur trioxide gas; The air drying of air steel cylinder also enters in the sulfur trioxide bottle by after the gas flowmeter metering, and sulfur trioxide is blown out gradually, and the gas that blows out imports the sulfonating reaction bottle until the sulfur trioxide total overall reaction is complete after surge flask is heated to 60-70 ℃; Continue to react half an hour in 60C, stop to stir; Insulation sedimentation half an hour, emit unreacted oil and mahogany acid, be neutralized to pH7-7.5 with quality 20% sodium hydrate aqueous solution at 60 ℃ under constantly stirring, add 300 milliliters of quality 50% ethanol/water solution extractions, get petroleum sulfonate, separate after the placement layering, evaporate to dryness alcohol water layer namely gets product.
Description of drawings
Well example one is implemented in Fig. 1 five step four slug method augmented injections
Well example two is implemented in Fig. 2 five step four slug method augmented injections
The specific embodiment:
Embodiment 1:
The stake on August 7th, 2006 of an example well, stake initial stage day injection allocation 20m
3, day real 22m that annotates
3, oil pressure 16.3MPa, casing pressure 16.0MPa is along with the prolongation of water injection time, begin to annotate not advance in November, 2009, successively carried out regular mud acid augmented injection and the augmented injection of many hydracids, water injection pressure is all less than obviously descending, present oil pressure 16.5MPa, casing pressure 16.5MPa, daily water-injection rate only is 5m
3Implement five step four slug method augmented injections in March, 2010: just for cleaning fluid, fill a prescription is the first step: 7% hydrochloric acid, and 2% glacial acetic acid, 2% composite additive, 2% ammonium chloride, liquid measure 1 side, closing well reaction 50min, pit shaft is replaced out in residual acid; Second step injects the first preposition sour slug, and preposition acid prescription is: 11% hydrochloric acid, and 2% glacial acetic acid, 2% composite additive, 2% ammonium chloride, liquid measure is 1 times of hole volume; The 3rd step was just squeezing into the second main acid slug, main acid: 11% hydrochloric acid, and 4% glacial acetic acid, 1% hydrofluoric acid, 2% composite additive, 2% ammonium chloride, liquid measure is 2 times of hole volumes; The 4th step was just squeezing into the 3rd rearmounted sour slug, rearmounted acid: 13% hydrochloric acid, and 4% glacial acetic acid, 4% composite additive, 4% ammonium chloride, liquid measure is 2 times of hole volumes; The 5th step was just squeezing into the 4th ultralow interfacial tension surfactant slug, and liquid measure is 5 times of hole volumes, and surfactant concentration is 0.5%%.After the augmented injection, water injection pressure is reduced to oil pressure 9.5MPa, casing pressure 9.5MPa, and daily water-injection rate is 20m
3, reached the injection allocation requirement, effective so far, as shown in Figure 1.
Embodiment 2:
The stake on August 10th, 2006 of No. two example wells, stake initial stage day injection allocation 20m
3, day real 20m that annotates
3, oil pressure 13.5MPa, casing pressure 13.5MPa is along with the prolongation of water injection time, begin to annotate not advance in January, 2010, successively carried out regular mud acid augmented injection and retarded acid augmented injection, water injection pressure is all less than obviously descending, present oil pressure 18.0MPa, casing pressure 17.8MPa annotates not advance.Implement the present invention's five step four slug method augmented injections in April, 2010:: just for cleaning fluid, fill a prescription is the first step: 8% hydrochloric acid, 4% glacial acetic acid, 4% composite additive, 4% ammonium chloride, liquid measure 2 sides, closing well reaction 50min, pit shaft is replaced out in residual acid; Second step injects the first preposition sour slug, and preposition acid prescription is: 13% hydrochloric acid, and 4% glacial acetic acid, 4% composite additive, 4% ammonium chloride, liquid measure is 1 times of hole volume; The 3rd step was just squeezing into the second main acid slug, main acid: 13% hydrochloric acid, and 6% glacial acetic acid, 3% hydrofluoric acid, 4% composite additive, 4% ammonium chloride, liquid measure is 2 times of hole volumes; The 4th step was just squeezing into the 3rd rearmounted sour slug, rearmounted acid: 13% hydrochloric acid, and 4% glacial acetic acid, 4% composite additive, 4% ammonium chloride, liquid measure is 2 times of hole volumes; The 5th step was just squeezing into the 4th ultralow interfacial tension surfactant slug, and liquid measure is 5 times of hole volumes, and surfactant concentration is 0.15%.After the augmented injection, water injection pressure is reduced to oil pressure 10.5MPa, casing pressure 10.5MPa, and daily water-injection rate is 25m
3, reached the injection allocation requirement, effective so far, as shown in Figure 2.
The manual subordinate list:
Table 1 anion surfactant performance evaluation
Claims (5)
1. method that reduces reservoir well water injection pressure is characterized in that:
The first step is just being replaced cleaning fluid, liquid measure 1-2 side, and closing well reaction 50min cleans pit shaft, oil pipe and eyelet impurity, and pit shaft is replaced out in residual acid;
Second step injects the first preposition sour slug, and liquid measure is 1 times of hole volume;
The 3rd step was just squeezing into the second main acid slug, and liquid measure is 2 times of hole volumes;
The 4th step was just squeezing into the 3rd rearmounted sour slug, and liquid measure is 2 times of hole volumes;
The 5th step was just squeezing into the 4th surfactant slug, and liquid measure is 5-6 times of hole volume, and the surfactant mass concentration is 0.15-0.05%, and all the other are clear water;
Described cleaning fluid is by mass%: 7-8% hydrochloric acid, and the 2-4% glacial acetic acid, the 2-4% composite additive, 2-4% ammonium chloride, all the other are clear water;
Described preposition acid is by mass%: 11-13% hydrochloric acid, and the 2-4% glacial acetic acid, the 2-4% composite additive, 2-4% ammonium chloride, all the other are clear water;
Described main acid is by mass%: 11-13% hydrochloric acid, and the 4-6% glacial acetic acid, 1-3% hydrofluoric acid, the 2-4% composite additive, 2-4% ammonium chloride, all the other are clear water;
Described rearmounted acid is by mass%: 11-13% hydrochloric acid, and the 2-4% glacial acetic acid, the 2-4% composite additive, 2-4% ammonium chloride, all the other are clear water;
Described surfactant preparation method: select the low solidifying cycloalkyl vacuum distillate in Xinjiang to be raw material, SO 3 sulfonated with gas; Take 1000 milliliters of there-necked flasks that agitator, thermometer are housed as the sulfonating reaction bottle, put into 500-650 gram fraction oil, agitating heating is warming up to 60 ℃, be weighed into required sulfan amount with 500 milliliters of there-necked flasks that thermometer is housed in addition, the mass ratio of oil and sulfur trioxide is 1: 1.4, and water bath heat preservation is with the generation of control sulfur trioxide gas; The air drying of air steel cylinder also enters in the sulfur trioxide bottle by after the gas flowmeter metering, and sulfur trioxide is blown out gradually, and the gas that blows out imports the sulfonating reaction bottle until the sulfur trioxide total overall reaction is complete after surge flask is heated to 60-70 ℃; Continue to react half an hour in 60C, stop to stir; Insulation sedimentation half an hour, emit unreacted oil and mahogany acid, be neutralized to pH7-7.5 with quality 20% sodium hydrate aqueous solution at 60 ℃ under constantly stirring, add 300 milliliters of quality 50% ethanol/water solution extractions, get petroleum sulfonate, separate after the placement layering, evaporate to dryness alcohol water layer namely gets product.
2. the method for reduction reservoir well water injection pressure according to claim 1, it is characterized in that: described composite additive is the compound of clay stabilizer, cleanup additive and ferrous stability, concrete 20% clay stabilizer, 30% cleanup additive, 20% ferrous stability of forming, all the other are clear water.
3. the method for reduction reservoir well water injection pressure according to claim 2, it is characterized in that: described clay stabilizer is: small cation quaternary ammonium salt, product designation COP-1, molecular weight 500-600, manufacturer Xi'an long celebrating Chemical Group Co., Ltd.
4. the method for reduction reservoir well water injection pressure according to claim 2 is characterized in that: described cleanup additive: fluorocarbon surfactant, product designation CF-5D, manufacturer Xi'an long celebrating Chemical Group Co., Ltd.
5. the method for reduction reservoir well water injection pressure according to claim 2, it is characterized in that: described ferrous stability is: TGA.
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| CN2011101986211A CN102877820A (en) | 2011-07-15 | 2011-07-15 | Method for reducing water injection pressure of reservoir well |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108203580A (en) * | 2016-12-20 | 2018-06-26 | 中国石油化工股份有限公司 | A kind of method using Gemini surface active agent increasing injection |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060223914A1 (en) * | 2005-03-31 | 2006-10-05 | Tsutomu Yuasa | Polycarboxylic acid polymer for blending in cement |
| CN1869148A (en) * | 2005-05-25 | 2006-11-29 | 中国石油天然气股份有限公司 | Acid surface active agent oil well leaking stoppage technology and its formula |
| US20070107897A1 (en) * | 2005-11-16 | 2007-05-17 | Dahanayake Manilal S | Methods for recovering oil from an oil reservoir |
| CN101196109A (en) * | 2007-12-27 | 2008-06-11 | 大庆石油学院 | Three-segment type block releasing technique for oil layer |
| CN101265406A (en) * | 2008-05-09 | 2008-09-17 | 中国石油天然气股份有限公司 | Pad acid liquid and pad acid sand fracturing method |
| CN101705081A (en) * | 2009-11-17 | 2010-05-12 | 中国石油天然气股份有限公司 | Gemini quaternary-ammonium-salt water injection increasing agent |
| CN101712864A (en) * | 2009-11-17 | 2010-05-26 | 中国石油天然气股份有限公司 | Multi-hydrogen acid injection increasing agent used in sandstone oilfields |
-
2011
- 2011-07-15 CN CN2011101986211A patent/CN102877820A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060223914A1 (en) * | 2005-03-31 | 2006-10-05 | Tsutomu Yuasa | Polycarboxylic acid polymer for blending in cement |
| CN1869148A (en) * | 2005-05-25 | 2006-11-29 | 中国石油天然气股份有限公司 | Acid surface active agent oil well leaking stoppage technology and its formula |
| US20070107897A1 (en) * | 2005-11-16 | 2007-05-17 | Dahanayake Manilal S | Methods for recovering oil from an oil reservoir |
| CN101196109A (en) * | 2007-12-27 | 2008-06-11 | 大庆石油学院 | Three-segment type block releasing technique for oil layer |
| CN101265406A (en) * | 2008-05-09 | 2008-09-17 | 中国石油天然气股份有限公司 | Pad acid liquid and pad acid sand fracturing method |
| CN101705081A (en) * | 2009-11-17 | 2010-05-12 | 中国石油天然气股份有限公司 | Gemini quaternary-ammonium-salt water injection increasing agent |
| CN101712864A (en) * | 2009-11-17 | 2010-05-26 | 中国石油天然气股份有限公司 | Multi-hydrogen acid injection increasing agent used in sandstone oilfields |
Non-Patent Citations (1)
| Title |
|---|
| 周宗强等: "长庆靖边气田深度酸压改造技术的发展与完善", 《钻采工艺》, vol. 29, no. 2, 31 March 2006 (2006-03-31), pages 48 - 50 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108203580A (en) * | 2016-12-20 | 2018-06-26 | 中国石油化工股份有限公司 | A kind of method using Gemini surface active agent increasing injection |
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Application publication date: 20130116 |