CN101298555B - Harmless clean fracturing fluid - Google Patents
Harmless clean fracturing fluid Download PDFInfo
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- CN101298555B CN101298555B CN2008101502527A CN200810150252A CN101298555B CN 101298555 B CN101298555 B CN 101298555B CN 2008101502527 A CN2008101502527 A CN 2008101502527A CN 200810150252 A CN200810150252 A CN 200810150252A CN 101298555 B CN101298555 B CN 101298555B
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- quaternary ammonium
- alkyl
- fracturing fluid
- carbon
- clean fracturing
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Abstract
The invention provides a harmless clean fracturing fluid which contains alkyl quaternary ammonium salt mixture, counter-ion salt, low carbon alcohol and water, wherein, the concentration of an aqueous solution is between 2 percent and 6 percent, and the alkyl quaternary ammonium salt mixture: the counter-ion salt: the low carbon alcohol is equal to 6:3:1 calculating by weight. The raw materials of used components are added into water in sequence according to proportion under agitating condition when using the clean fracturing fluid on site, which has higher viscous elasticity and carrying function when being prepared into an aqueous solution of 2 to 6 percent, thus fully meeting the requirements of the site fracturing fluid sand-carrying of an oil-gas field. The invention has the advantages of simple formula, low cost, small fluid loss, high recovery rate of core permeability, residual free and being easy to be emitted, etc.
Description
Technical field
The present invention relates to a kind of fracturing liquid of fracturing yield increasing measure in the oilfield exploitation procedure.
Background technology
Widely used in practice at present is aqueous fracturing fluid, mainly adopts vegetable jelly (linear macromolecule) to make thickening material, carries out crosslinkedly with relational extender under optimum conditions, forms the polymer reticulated structure, to realize fracturing liquid viscosity.The chemical gel breaker of the essential employing of the underground broken glue of this class fracturing liquid destroys the polymer reticulated structure, reduces fracturing liquid viscosity, reaches brokenly the purpose of glue.The weak point of plant gum fracturing fluid is to exist residue, and residue is mainly from two aspects: the 1. water-insoluble that exists of vegetable jelly itself; 2. the not thorough residual microgel of broken glue.Residue causes the injury that is difficult to recover to fracturing fracture support belt rate of permeation and zone permeability, has a strong impact on the fracturing yield increasing effect.
Occurred clean fracturing fluid in recent years again, be applicable to low temperature, low pressure, the transformation of hypotonic or special LOW PERMEABILITY RESERVOIR stone, great advantage is not injure the stratum, basic moiety is long alkyl chain length quaternary ammonium salt, gegenion salt sodium salicylate, low-carbon alcohol and water have the sand of taking effect, and certain practicality is arranged.But simple use long alkyl chain length quaternary ammonium salt, have only viscosity preferably, lack enough elasticity, cause in the practical application frictional resistance bigger, the sand ratio does not increase, and maximum sand ratio can only reach about 20%.Gegenion generally uses sodium salicylate, can make the clean fracturing fluid gelation rate fast, matching while using, convenient on-the-spot the use.But sodium salicylate expense height has greatly increased the use cost of clean fracturing fluid, this be clean fracturing fluid for many years, the major cause used of scale not always.
Summary of the invention
The purpose of this invention is to provide a kind of harmless clean fracturing fluid, it has, and prescription is simple, and with low cost, leak-off is little, recovery of core permeability height, noresidue, characteristics such as easy discharging.
The invention provides a kind of harmless clean fracturing fluid, comprise quaternary ammonium alkyl salt mixture, gegenion salt, low-carbon (LC) alcohol and water, wherein the weight ratio of three kinds of compositions is the quaternary ammonium alkyl salt mixture: gegenion salt: low-carbon alcohol=6-7: 3-4: 1-2, preferred 6: 3: 1, concentration of aqueous solution was 2%-6%.
Wherein said quaternary ammonium alkyl salt mixture is less than 12 carbon alkyl quaternary ammonium saltss, 12-14 carbon alkyl quaternary ammonium salts and 16-18 carbon alkyl quaternary ammonium salts.And in the alkyl quaternary ammonium salts different lengths carbochain mixture, calculate short carbon chain with weight ratio: middle carbochain: long carbochain=1: 3: 6.
Wherein said gegenion salt is potassium hypochlorite.
Wherein said low-carbon alcohol is ethanol or Virahol.
Wherein saidly be: 8-12 carbon alkyl-dimethyl ammonium chloride, preferred dodecyl dimethyl ammonium chloride less than 12 carbon alkyl quaternary ammonium saltss.
Wherein said 12-14 carbon alkyl quaternary ammonium salts is: 12-14 carbon alkyl-dimethyl ammonium chloride, preferred tetradecyl alkyl dimethyl ammonium chloride.
Wherein said 16-18 carbon alkyl quaternary ammonium salts is: 16-18 carbon alkyl-dimethyl ammonium chloride, preferred octadecyl alkyl dimethyl ammonium chloride.
The present invention is under the constant condition of the amount of using alkyl quaternary ammonium salts, with the mode of using long alkyl chain length quaternary ammonium salt separately change into long, in, the mixture of short carbon chain alkyl quaternary ammonium salts, usage ratio is for short: in: length=1-2: 3-5: 6-8, preferred 1: 3: 6, the result, clean fracturing fluid not only has bigger viscosity, possesses enough elasticity simultaneously, has reduced the frictional resistance in the on-the-spot use.
Potassium hypochlorite is used as the gegenion salt of clean fracturing fluid, under the constant prerequisite of every use properties, greatly reduced the cost of use of clean fracturing fluid, and potassium ion has certain antiexpanding action as a kind of expansion-resisting agent to oil reservoir.
On-the-spot when using clean fracturing fluid, with the raw material of used composition in proportion, under agitation condition, add successively in the entry, be made into the aqueous solution that concentration is 2%-6%, occur until gel.
Friction resistance when using long alkyl chain length quaternary ammonium salt and long short-and-medium mixture alkyl chain length quaternary ammonium salt as clean fracturing fluid host separately relatively sees Table 1:
The clean fracturing fluid viscosity in aqueous solution (mPas) of table 2 different concns
| 20° | 25℃、100S -1, shear 10 minutes (mPas) |
| 2％ | 50 |
| 4％ | 90 |
| 6％ | 130 |
Prolong sweet 1211 oil wells in oil recovery factory, Xia Si gulf, oil field, use this clean fracturing fluid to carry out the transformation pressure break.950 meters-990 meters of this well fractured well sections belong to long 2 layers, pressure break production fluid day before yesterday 2.5M, day produce oil 0.35M.Use clean fracturing fluid 60M altogether, the clean fracturing fluid working concentration is 4%, spearhead consumption 10M
3, overdisplacement volume 5M
3, sand-carrying agent consumption 45M
3, propping agent consumption 20M
3, average sand is than 44%, and high sand ratio is 53%, and after the pressure break, breaking glue solution viscosity is 1.3-3.6mPas, and second day production fluid amount is 17M
3/ D, oil offtake is 5.2M
3/ D.
Embodiment
Embodiment 1
Choose ten alkyl-dimethyl ammonium chloride 10g, tetradecyl alkyl dimethyl ammonium chloride 30g, hexadecyldimethyl benzyl ammonium ammonium chloride 60g, potassium hypochlorite 50g, ethanol 17g.Above material is added thorough mixing in the entry successively under agitation condition, when the aqueous solution that is made into 4%, 25 ℃, 100S
-1, to shear 10 minutes, viscosity is 73mPas, and higher visco-elasticity is arranged, and has the sand of taking function, satisfies the on-the-spot fracturing liquid of oil-gas field fully and takes the sand requirement.
Embodiment 2
Choose dodecyl dimethyl ammonium chloride 10g, tetradecyl alkyl dimethyl ammonium chloride 30g, hexadecyldimethyl benzyl ammonium ammonium chloride 60g, potassium hypochlorite 67g, ethanol 17g.Above material is added thorough mixing in the entry successively under agitation condition, when the aqueous solution that is made into 4%, 25 ° of C, 100S
-1, to shear 10 minutes, viscosity is 85mPas, and higher visco-elasticity is arranged, and has the sand of taking function, satisfies the on-the-spot fracturing liquid of oil-gas field fully and takes the sand requirement.
Embodiment 3
Choose ten alkyl-dimethyl ammonium chloride 10g, tetradecyl alkyl dimethyl ammonium chloride 30g, octadecyl alkyl dimethyl ammonium chloride 60g, potassium hypochlorite 67g, Virahol 30g.Above material is added thorough mixing in the entry successively under agitation condition, when the aqueous solution that is made into 4%, 25 ° of C, 100S
-1, to shear 10 minutes, viscosity is 90mPas, and higher visco-elasticity is arranged, and has the sand of taking function, satisfies the on-the-spot fracturing liquid of oil-gas field fully and takes the sand requirement.
Embodiment 4
Choose ten alkyl-dimethyl ammonium chloride 10g, tetradecyl alkyl dimethyl ammonium chloride 30g, octadecyl alkyl dimethyl ammonium chloride 60g, potassium hypochlorite 40g, Virahol 14g.Above material is added thorough mixing in the entry successively under agitation condition, when the aqueous solution that is made into 5%, higher visco-elasticity is arranged, have the sand of taking function, satisfy the on-the-spot fracturing liquid of oil-gas field fully and take the sand requirement.
Embodiment 5
Choose ten alkyl-dimethyl ammonium chloride 10g, tetradecyl alkyl dimethyl ammonium chloride 30g, octadecyl alkyl dimethyl ammonium chloride 60g, potassium hypochlorite 57g, ethanol 14g.Above material is added thorough mixing in the entry successively under agitation condition, when the aqueous solution that is made into 2%, higher visco-elasticity is arranged, have the sand of taking function, satisfy the on-the-spot fracturing liquid of oil-gas field fully and take the sand requirement.
Embodiment 6
Choose ten alkyl-dimethyl ammonium chloride 10g, tetradecyl alkyl dimethyl ammonium chloride 30g, octadecyl alkyl dimethyl ammonium chloride 60g, potassium hypochlorite 57g, ethanol 26g.Above material is added thorough mixing in the entry successively under agitation condition, when the aqueous solution that is made into 6%, higher visco-elasticity is arranged, have the sand of taking function, satisfy the on-the-spot fracturing liquid of oil-gas field fully and take the sand requirement.
Claims (5)
1. harmless clean fracturing fluid, comprise the quaternary ammonium alkyl salt mixture, gegenion salt, the low-carbon (LC) alcohol and water, it is characterized in that concentration of aqueous solution is 2%-6% by weight, calculate the quaternary ammonium alkyl salt mixture with weight ratio: gegenion salt: low-carbon alcohol=6: 3: 1, wherein said quaternary ammonium alkyl salt mixture is less than 12 carbon alkyl quaternary ammonium saltss, 12-14 carbon alkyl quaternary ammonium salts and 16-18 carbon alkyl quaternary ammonium salts, and in the alkyl quaternary ammonium salts different lengths carbochain mixture, calculate short carbon chain with weight ratio: middle carbochain: long carbochain=1: 3: 6, wherein said gegenion salt is potassium hypochlorite, and wherein said low-carbon alcohol is ethanol or Virahol.
2. harmless clean fracturing fluid as claimed in claim 1 is characterized in that described 16-18 carbon alkyl quaternary ammonium salts is 16-18 carbon alkyl-dimethyl ammonium chloride.
3. harmless clean fracturing fluid as claimed in claim 1 is characterized in that described is ten alkyl-dimethyl ammonium chlorides less than 12 carbon alkyl quaternary ammonium saltss.
4. harmless clean fracturing fluid as claimed in claim 1 is characterized in that described 12-14 carbon alkyl quaternary ammonium salts is the tetradecyl alkyl dimethyl ammonium chloride.
5. harmless clean fracturing fluid as claimed in claim 1 is characterized in that described 16-18 carbon alkyl quaternary ammonium salts is the octadecyl alkyl dimethyl ammonium chloride.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101502527A CN101298555B (en) | 2008-07-04 | 2008-07-04 | Harmless clean fracturing fluid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101502527A CN101298555B (en) | 2008-07-04 | 2008-07-04 | Harmless clean fracturing fluid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101298555A CN101298555A (en) | 2008-11-05 |
| CN101298555B true CN101298555B (en) | 2011-08-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101502527A Expired - Fee Related CN101298555B (en) | 2008-07-04 | 2008-07-04 | Harmless clean fracturing fluid |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101693830B (en) * | 2009-10-28 | 2013-04-24 | 中联煤层气国家工程研究中心有限责任公司 | Low-cost water-based clean fracturing fluid and gel breaking fluid used for fracturing |
| CN102155209B (en) * | 2011-01-21 | 2014-01-01 | 中国石油大学(北京) | Method for fracturing stratum by acidity viscoelastic fluid |
| CN102643637B (en) * | 2012-03-22 | 2013-10-16 | 中国石油天然气股份有限公司 | clean fracturing fluid |
| CN108913117A (en) * | 2018-07-21 | 2018-11-30 | 北京宝丰春石油技术有限公司 | A kind of clean sand carrier |
| CN116023926A (en) * | 2023-01-10 | 2023-04-28 | 西安石油大学 | Instant clean fracturing fluid thickener and preparation method thereof |
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2008
- 2008-07-04 CN CN2008101502527A patent/CN101298555B/en not_active Expired - Fee Related
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| CN101298555A (en) | 2008-11-05 |
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Owner name: SHAANXI YANCHANG PERTROLEUM OILFIELD CHEMICAL TECH Free format text: FORMER OWNER: SHAANXI HAI'AN INDUSTRY CO., LTD. Effective date: 20121227 |
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Free format text: CORRECT: ADDRESS; FROM: 710065 XI'AN, SHAANXI PROVINCE TO: 717400 YANAN, SHAANXI PROVINCE |
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Effective date of registration: 20121227 Address after: 717400 Ansai Industrial Park, Ansai County, Shaanxi, Yanan Patentee after: Shaanxi Yanchang Pertroleum Oilfield Chemical Technology Co., Ltd. Address before: 710065 Shaanxi city of Xi'an province high tech Zone Tang Yan Road No. 35 Mong modern city E building room 2005 Patentee before: Shaanxi Hai'an Industry Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
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Granted publication date: 20110817 Termination date: 20170704 |