CN101705082A - Formulated fracturing fluid of micro emulsion gel - Google Patents
Formulated fracturing fluid of micro emulsion gel Download PDFInfo
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- CN101705082A CN101705082A CN200910230810A CN200910230810A CN101705082A CN 101705082 A CN101705082 A CN 101705082A CN 200910230810 A CN200910230810 A CN 200910230810A CN 200910230810 A CN200910230810 A CN 200910230810A CN 101705082 A CN101705082 A CN 101705082A
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Abstract
The invention provides a formulated fracturing fluid of micro emulsion gel and a proportion thereof, the formulated fracturing fluid of micro emulsion gel comprises the following components by weight percent: 3.8 to 16.7 percent of micro emulsion system, 0.1 to 0.5 percent of polymer, 0.25 to 1.20 percent of cross linking agent, 0.05 to 0.60 percent of gel breaker, 0.05 to 0.10 percent of heat stabilizer and 80.90 to 95.75 percent of water, wherein the micro emulsion system consists of kerosene, compound surfactant, low-molecule alcohol and water, and the polymer is guar gum. By utilizing the synergistic effect of the micro emulsion and gel, the formulated fracturing fluid of micro emulsion gel is characterized by low content of polymer, high viscosity, low filtration, low content of polymer residual in solution after gel breaking, micro emulsion status of the system after gel breaking, lower surface tension, good suspending power and the like, can greatly reduce flow-back pressure and damage to reservoir, and improve the fracture flow capacity and crude output.
Description
Technical field
The present invention relates to a kind of fracturing liquid, specifically, is the fracturing liquid of micro emulsion and the composite formation of gel.
Background technology
Pressure break is volume increase, the well stimulation of widely using that oil reservoir is transformed in the oil field.Fracturing liquid is the working fluid in the fracturing reform hydrocarbon zone process, and it plays and transmit pressure, form formation fracture, carry propping agent enters fissured effect, and to a certain extent, of the fracturing fluid performance becomes the key factor of decision fracturing effect.Oil field fracturing liquid commonly used has polymers soln fracturing liquid, gel fracturing liquid, foamed fracturing fluid and viscoelastic surfactant fracturing liquid etc. at present.First three is planted fracturing liquid and all has polymer residue amount and the big shortcoming of filter loss, and is big to reservoir and diversion section permeability injury; Though it is also good that the viscoelastic surfactant fracturing liquid does not contain polymkeric substance, fracturing effect, also there is big, the higher relatively defective of cost of filter loss.Above-mentioned these fracturing liquid ubiquities return row pressure power height, the row of returning not thoroughly, to problems such as reservoir and diversion section permeability injury are bigger.Therefore, be necessary to develop some suitable low pressure reservoirs, to reservoir and the little novel fracturing liquid of fracture guide section permeability injury.
Summary of the invention
The objective of the invention is to provide a kind of formulated fracturing fluid of micro emulsion gel, utilizes the synergistic effect between micro emulsion and the gel, to overcome above-mentioned the deficiencies in the prior art part.
Purpose of the present invention is realized by following component and ratio thereof:
Microemulsion system: 3.8%～16.7%;
Polymkeric substance: 0.1%～0.5%;
Linking agent: 0.25%～1.20%;
Gel breaker: 0.05%～0.60%;
Thermo-stabilizer: 0.05%～0.10%;
Water: 80.90%～95.75%.
Above-mentioned microemulsion system is made up of by 2: 1 blended mixed surfactant, low mass molecule alcohol (as ethanol or Virahol) and water kerosene, tween and Si Pan, wherein kerosene account for the microemulsion system total amount 24%～26%, water accounts for 27%～29%, mixed surfactant account for 22%～27% and low mass molecule alcohol account for 21%～23%; Polymkeric substance is a guanidine that glue, and molecular weight is (1～2) * 10
6Linking agent is inorganic borate or organic boron; Gel breaker is a superoxide; Thermo-stabilizer is an alcamine compound; Water is clear water or low mineralization sewage.
The percentage ratio of said components is weight percentage.
The present invention utilizes the synergistic effect of micro emulsion and gel can improve these characteristics of conventional gel fracturing liquid measure effect, select microemulsion system and gelling system to carry out composite, obtain a kind of novel micro emulsion gel fracturing liquid, make filter loss, reduction frictional resistance, the prop-carrying capacity of fracturing liquid system improve.Owing to have synergistic effect between micro emulsion and the gel, the required polymer content of fracturing liquid system that obtains identical performance reduces, and can reduce the injury of polymer residue to reservoir again.Under the effect of gel breaker, destroyed in the micro emulsion gel fracturing liquid 1～2 hour, destroy the back system and be the micro emulsion state, have lower surface tension, thereby return row pressure power and reduce significantly, can improve flowback effect, be fit to low pressure reservoirs.Microemulsion behind the broken glue has good suspending power, thereby can reduce the injury of residue to reservoir, increases fracture flow capacity.
The invention has the beneficial effects as follows: because micro emulsion and gel carry out composite, brought into play the synergistic effect between micro emulsion and the gel, compare with the gel fracturing liquid and to have the following advantages: (1) under same polymer content, formulated fracturing fluid of micro emulsion gel viscosity height, prop-carrying capacity is strong; (2) filter loss descends more than 1/2nd; (3) frictional resistance reduces by 6%～12%; (4) behind the broken glue in the solution polymer residue few, can be suspended in the solution, solution is the micro emulsion state, surface tension is lower, and is good with the local water compatibleness.Help taking sand, reduce power and reducing the injury of fracturing fluid leak to reservoir, the recovery that also help the of the fracturing fluid row of returning, improves reservoir and diversion section rate of permeation in the fracturing process.
Embodiment
Come enumeration the present invention below in conjunction with embodiment.
Embodiment:
Form 3 groups of fracturing liquids with 6 prescriptions below and carry out filter loss and capillary contrast experiment, experimental result is listed in table 1 and the table 2.
Prescription 1 (formulated fracturing fluid of micro emulsion gel): 3.8% microemulsion system+0.1% polymkeric substance+0.25% linking agent+0.05% gel breaker+0.05% thermo-stabilizer+95.75% water;
Prescription 2 (gel fracturing liquids): 0.1% polymkeric substance+0.25% linking agent+0.05% gel breaker+0.05% thermo-stabilizer+99.55% water;
Prescription 3 (formulated fracturing fluid of micro emulsion gel): 10.7% microemulsion system+0.3% polymkeric substance+0.7% linking agent+0.3% gel breaker+0.08% thermo-stabilizer+87.92% water;
Prescription 4 (gel fracturing liquids): 0.3% polymkeric substance+0.7% linking agent+0.3% gel breaker+0.08% thermo-stabilizer+98.62% water;
Prescription 5 (formulated fracturing fluid of micro emulsion gel): 16.7% microemulsion system+0.5% polymkeric substance+1.2% linking agent+0.6% gel breaker+0.1% thermo-stabilizer+80.9% water;
Prescription 6 (gel fracturing liquids): 0.5% polymkeric substance+1.2% linking agent+0.6% gel breaker+0.1% thermo-stabilizer+97.6% water.
The of the fracturing fluid filter loss of table 1 formulated fracturing fluid of micro emulsion gel and gel
Can find out obviously that from table 1 under the identical situation of the content of polymkeric substance, linking agent, gel breaker, thermo-stabilizer, the filter loss that adds the formulated fracturing fluid of micro emulsion gel system that makes behind the microemulsion system is less than half of the filter loss of gel fracturing liquid system.
By above-mentioned prescription 1, prescription 2, prescription 3, prescription 4, prescription 5 and the 6 formed fracturing liquids broken glue behind 1～2h of filling a prescription, record brokenly glue after of the fracturing fluid surface tension see Table 2, as can be seen, the adding of micro emulsion has reduced the surface tension of solution significantly.
Formulated fracturing fluid of micro emulsion gel and the of the fracturing fluid surface tension of gel behind the broken glue of table 2
In order to investigate the superiority of formulated fracturing fluid of micro emulsion gel system, clean simulated experiment to carried out indoor frictional resistance simulated experiment and crack by above-mentioned prescription 1～6 formed fracturing liquid, the result shows: the frictional ratio gel fracturing liquid of formulated fracturing fluid of micro emulsion gel reduces by 6～12%; The rate of permeation recovery rate that adopts formulated fracturing fluid of micro emulsion gel to pile up the fracture guide section that forms is of the fracturing fluid 1.3～2.4 times an of gel; The compactness extent of observing the filter cake that the formulated fracturing fluid of micro emulsion gel system forms is lower relatively than gel fracturing liquid system, only needs less initial flow pressure just it can be removed, and helps the of the fracturing fluid row of returning.
Claims (2)
1. formulated fracturing fluid of micro emulsion gel is characterized in that being made up of following component and ratio thereof:
Microemulsion system: 3.8%～16.7%;
Polymkeric substance: 0.1%～0.5%;
Linking agent: 0.25%～1.20%;
Gel breaker: 0.05%～0.60%;
Thermo-stabilizer: 0.05%～0.10%;
Water: 80.90%～95.75%;
Above-mentioned microemulsion system is made up of by 2: 1 blended mixed surfactant, low mass molecule alcohol and water kerosene, tween and Si Pan, wherein kerosene account for the microemulsion system total amount 24%～26%, water accounts for 27%～29%, mixed surfactant account for 22%～27% and low mass molecule alcohol account for 21%～23%; Polymkeric substance is a guanidine that glue, and molecular weight is 1 * 10
6～2 * 10
6Linking agent is inorganic borate or organic boron; Gel breaker is a superoxide; Thermo-stabilizer is an alcamine compound; Water is clear water or low mineralization sewage;
The percentage ratio of said components is weight percentage.
2. formulated fracturing fluid of micro emulsion gel according to claim 1 is characterized in that low mass molecule alcohol is ethanol or Virahol.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102308105A CN101705082B (en) | 2009-11-20 | 2009-11-20 | Formulated fracturing fluid of micro emulsion gel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102308105A CN101705082B (en) | 2009-11-20 | 2009-11-20 | Formulated fracturing fluid of micro emulsion gel |
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| CN101705082A true CN101705082A (en) | 2010-05-12 |
| CN101705082B CN101705082B (en) | 2012-07-04 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103059829A (en) * | 2013-01-25 | 2013-04-24 | 中国石油大学(华东) | Nanometer emulsion type water control fracturing fluid for tight gas reservation well and preparation method thereof |
| CN108239521A (en) * | 2016-12-23 | 2018-07-03 | 中石化石油工程技术服务有限公司 | A kind of drilling fluid micro emulsion gel and preparation method thereof |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6613720B1 (en) * | 2000-10-13 | 2003-09-02 | Schlumberger Technology Corporation | Delayed blending of additives in well treatment fluids |
| AU2003250012A1 (en) * | 2002-07-09 | 2004-01-23 | Sofitech N.V. | Self-diverting pre-flush acid for sandstone |
| CN1524920A (en) * | 2003-02-28 | 2004-09-01 | 中国石油天然气股份有限公司 | Organic boron delayed crosslinking plant gum fracturing fluid |
| US9034802B2 (en) * | 2006-08-17 | 2015-05-19 | Schlumberger Technology Corporation | Friction reduction fluids |
| CN101519585B (en) * | 2009-03-31 | 2011-05-04 | 荆州市弘利化工科技有限公司 | Shearing cross-linking sensitive plugging agent and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103059829A (en) * | 2013-01-25 | 2013-04-24 | 中国石油大学(华东) | Nanometer emulsion type water control fracturing fluid for tight gas reservation well and preparation method thereof |
| CN103059829B (en) * | 2013-01-25 | 2014-08-20 | 中国石油大学(华东) | Nanometer emulsion type water control fracturing fluid for tight gas reservation well and preparation method thereof |
| CN108239521A (en) * | 2016-12-23 | 2018-07-03 | 中石化石油工程技术服务有限公司 | A kind of drilling fluid micro emulsion gel and preparation method thereof |
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| CN101705082B (en) | 2012-07-04 |
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