CN102093881A - Cross-linked oil-in-water emulsified fracturing fluid - Google Patents
Cross-linked oil-in-water emulsified fracturing fluid Download PDFInfo
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- CN102093881A CN102093881A CN2009102167516A CN200910216751A CN102093881A CN 102093881 A CN102093881 A CN 102093881A CN 2009102167516 A CN2009102167516 A CN 2009102167516A CN 200910216751 A CN200910216751 A CN 200910216751A CN 102093881 A CN102093881 A CN 102093881A
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- fracturing liquid
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Abstract
The invention discloses a cross-linked oil-in-water emulsified fracturing fluid, which belongs to a fracturing fluid technology and mainly solves the problem that the conventional fracturing fluid cannot meet the environmental requirements easily. The cross-linked oil-in-water emulsified fracturing fluid comprises the following components in percentage by mass: 2 percent of KCl, 0.45 percent of super guar gum, 0.6 percent of compound emulsifying agent, 0.15 percent of cleanup additive, 0.5 percent of emulsion splitter, 1 percent of clay stabilizer, 0.1 percent of modifier, 5 percent of diesel oil and the balance of water. The using effect of the fracturing fluid can be enhanced to a great extent, complete gel breaking is achieved by the fracturing fluid, and bonding capability is enhanced.
Description
Technical field
The present invention relates to a kind of fracturing liquid, specifically, relate to a kind of crosslinked oil-in-water emulsification fracturing liquid.
Background technology
Fracturing liquid (fracturing fluid) is that the working fluid in the hydrocarbon zone process is transformed in waterfrac treatment, plays a part to transmit pressure, formation and extension crack, carry propping agent.Fracturing liquid and performance thereof are the important factors that influences the pressure break success or failure, and this factor is more outstanding concerning big-frac treatment.Can fracturing liquid and performance thereof have the sand packed fracture of enough flow conductivities substantial connection is arranged to producing a sufficient size.In the general expenses of pressing crack construction, fracturing liquid will account for 1/2 or more, and the fracturing liquid that uses appropriate performance also is the important channel of improving the pressure break economic benefit.
Fracturing liquid is a general name, and according to the fracturing liquid role that injects into well in different steps, fracturing liquid is formed and is divided into following 3 classes:
(1) spearhead: promptly do not contain the fracturing liquid of propping agent, be used to form and extend formation fracture, set up necessary space, can reduce formation temperature simultaneously to keep fracturing liquid viscosity for propping agent enters the stratum
(2) sand-carrying agent: be used for further extending the crack, bring propping agent into the fracturing fracture predetermined position, filling crack and form high infiltration supporting crack band.Sand-carrying agent essence is a kind of fracturing liquid that is mixed with propping agent, and consumption is very big, decides on strata condition, liquid properties and transformation scale;
(3) displacing liquid: be used for sand-carrying agent in the pit shaft is all headed into formation fracture, avoid the shaft bottom sand setting.
For the spearhead that accounts for the liquid measure overwhelming majority and sand-carrying agent all should possess certain width generation capacity and make post-fracturing crack wall and sand packed fracture that enough flow conductivities be arranged, they must possess following performance requriements like this:
(1) leak-off is few: this is a key property of making slit, wide seam.Of the fracturing fluid leak-off depends primarily on its viscosity and building capacity, and viscosity height then leak-off is few.In fracturing liquid, add fluid loss agent and can improve building capacity, significantly reduce filter loss.
(2) outstanding sand ability is strong: of the fracturing fluid outstanding sand ability depends primarily on viscosity, as long as fracturing liquid has sufficiently high viscosity, sand can suspend fully, and distribution in seam is very favorable to sand for this.
(3) frictional resistance is low: fracturing liquid is more little at ducted frictional resistance, and the active power that then is used to make seam under the certain condition of plant capacity is many more.The too high utilising efficiency that not only reduces equipment of frictional resistance, even limited construction owing to wellhead pressure is too high.
(4) thermostability and anti-shear stability: guarantee that liquid can not or reduce viscosity owing to the temperature rising significantly under the mechanical shearing effect.
(5) compatibleness: fracturing liquid enters behind the stratum with rock forming mineral in the stratum and contacts, and should not work the physics or the chemical reaction that are unfavorable for oil infiltration, does not for example cause clay swelling or precipitation takes place and stops up the stratum.The requirement of this compatibleness is very important, and often poor effect after some low permeability formation pressure break has partly cause to cause owing to compatibleness is bad.
(6) broken glue fast, thoroughly: guarantee after the fracturing liquid construction row of returning fast, improve operating efficiency.
(7) residue content is low: reduce the injury of fracturing fluid residue to the stratum.
(8) source of goods extensively is convenient to preparation, and cost is moderate, and is practical economically.
Summary of the invention
The object of the present invention is to provide a kind of crosslinked oil-in-water emulsification fracturing liquid, use additive to improve of the fracturing fluid performance, make it satisfy the requirement of environment for use it.
To achieve these goals, the technical solution used in the present invention is as follows:
Crosslinked oil-in-water emulsification fracturing liquid, it is characterized in that, comprise that mass percent is 2%KCl, 0.45% super guanidine that glue, 0.6% compound emulsifying agent, 0.15% cleanup additive, 0.5% emulsion splitter, 1% clay stabilizer, 0.1% conditioning agent, 5% diesel oil, surplus is a water.
Also be added with linking agent in the described crosslinked oil-in-water emulsification fracturing liquid.
Described linking agent is organic borate cross-linker SQ-1.
Described crosslinked oil-in-water emulsification fracturing liquid has also appended gel breaker.
Described compound emulsifying agent is made up of according to mass ratio SP-10 and Span80 at 10: 90.
Described cleanup additive is QX-1.
Described clay stabilizer is DATC.
Described emulsion splitter is WLD33.
The beneficial effect that the present invention had is:
(1) it is slow not add brokenly the fracturing liquid rubber-breaking of glue activator under the low temperature, shear 110min continuously after the fracturing liquid apparent viscosity about 250mPas; 60 ℃ of following gel breaker dosages are 0.03%OB-1, and 50 ℃ of following gel breaker dosages are the broken glue activator of 0.01%+0.025% low temperature, and 40 ℃ of following gel breaker dosages are the broken glue activator of 0.02%+0.035% low temperature; The three has essentially identical rheological characteristics, shear 110min continuously after the fracturing liquid apparent viscosity about 100mPas;
(2) under 60 ℃, "=1.71, the both satisfies G ' among the SY/T6376-2008 " fracturing liquid general technical specifications "＞1, G "＞0.3 requirement for G ' of the present invention=3.15, G;
(3) for single quartz sand, static state of the present invention is hanged sand speed＜0.15cm/min; 30% sand than the time, static outstanding sand speed＜0.41cm/min shows that the present invention has well outstanding grittiness energy;
(4) filtration property of the present invention is well below the requirement of SY/T6376-2008 " fracturing liquid general technical specifications ";
(5) it is all less water drive and oil to be driven the permeability injury rate of rock core, is lower than among the SY/T6376-2008 " fracturing liquid general technical specifications " requirement less than 30% respectively.
Embodiment
Below the invention will be further described.
Crosslinked oil-in-water emulsification fracturing liquid, it is characterized in that, comprise that mass percent is 2%KCl, 0.45% super guanidine that glue, 0.6% compound emulsifying agent, 0.15% cleanup additive, 0.5% emulsion splitter, 1% clay stabilizer, 0.1% conditioning agent, 5% diesel oil, surplus is a water.
Preparation method of the present invention is: measure by the required experimental water of prescription requirement and pour agitator into, take by weighing viscosifying agent and additive by proportioning, regulating agitator speed to the whirlpool of liquid formation can see till the agitator paddle axis top, be sequentially added into the viscosifying agent and the additive that weigh up then, and constantly adjust rotating speed to guarantee above-mentioned whirlpool state.Stir 5min after adding whole additives, form homogeneous solution, pour in the beaker and add a cover, in 30 ℃ of waters bath with thermostatic control, leave standstill 4h, base fluid viscosity is tended towards stability.Gel breaker adds before preparation frozen glue.
Above-mentioned fracturing liquid prepare intact after, for convenience storage can also be made into frozen glue.Its preparation method is: the liquid fracturing liquid that will prepare is poured in the agitator, change rotating speed and make liquid level formation vortex in the agitator, till seeing the agitator top at the bottom of the vortex, make the agitator constant agitation, crosslinked fluid is poured into, stirred in agitator, vortex fades away, to the slight projection of liquid level, the even frozen glue that formation can hang.
The present invention has good rheological characteristics, and its apparent viscosity initial stage can increase gradually along with shear time, just can reduce along with the increase of shear time behind 20～30min, has embodied the advantage of delayed crosslinker; Add suitable breaking than fracturing liquid apparent viscosity after shearing 110min continuously after the agent about 100mPas under the differing temps; Fracturing liquid becomes the n value of shearing down for the second time at 60 ℃ and is 0.5394, and K is 3.345; The n value that becomes under shearing is 0.5725 for the third time, and K is 1.88, and the n value is than for the second time big for the third time, and the K value is littler than secondary, and of the fracturing fluid progressively broken glue process has been described; The visco-elasticity result of fracturing liquid under 60 ℃ shows its G '=3.15, and G "=1.71; The outstanding sand experiment of of the fracturing fluid static state shows single quartz sand, sand setting speed＜0.15cm/min; 30% sand than the time, sand setting speed＜0.41cm/min; 60 ℃ of following v
C=2.73 * 10-5m/min, Q
SPBe 2.31 * 10-4m3/m2; Rock core flowing experiment shows that this fracturing liquid filtrate is all less with the permeability injury rate that oil drives rock core to water drive, is respectively; This of the fracturing fluid residue content is 150mg/L only; Water layer surface tension behind the thoroughly broken glue of this fracturing liquid is 25.6mN/m, and the interfacial tension of water layer and oil reservoir is 3.6mN/m, and the interfacial tension of water layer and kerosene is 3.9mN/m.Every performance all satisfies the requirement of oil and gas industry standard.
Claims (8)
1. crosslinked oil-in-water emulsification fracturing liquid, it is characterized in that, comprise that mass percent is 2%KCl, 0.45% super guanidine that glue, 0.6% compound emulsifying agent, 0.15% cleanup additive, 0.5% emulsion splitter, 1% clay stabilizer, 0.1% conditioning agent, 5% diesel oil, surplus is a water.
2. crosslinked oil-in-water emulsification fracturing liquid according to claim 1 is characterized in that, also is added with linking agent in the described crosslinked oil-in-water emulsification fracturing liquid.
3. crosslinked oil-in-water emulsification fracturing liquid according to claim 2 is characterized in that described linking agent is organic borate cross-linker SQ-1.
4. crosslinked oil-in-water emulsification fracturing liquid according to claim 1 is characterized in that, described crosslinked oil-in-water emulsification fracturing liquid has also appended gel breaker.
5. crosslinked oil-in-water emulsification fracturing liquid according to claim 1 is characterized in that described compound emulsifying agent is made up of according to mass ratio SP-10 and Span80 at 10: 90.
6. crosslinked oil-in-water emulsification fracturing liquid according to claim 1 is characterized in that described cleanup additive is QX-1.
7. crosslinked oil-in-water emulsification fracturing liquid according to claim 1 is characterized in that described clay stabilizer is DATC.
8. crosslinked oil-in-water emulsification fracturing liquid according to claim 1 is characterized in that described emulsion splitter is WLD33.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102167516A CN102093881A (en) | 2009-12-14 | 2009-12-14 | Cross-linked oil-in-water emulsified fracturing fluid |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009102167516A CN102093881A (en) | 2009-12-14 | 2009-12-14 | Cross-linked oil-in-water emulsified fracturing fluid |
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| CN102093881A true CN102093881A (en) | 2011-06-15 |
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| CN2009102167516A Pending CN102093881A (en) | 2009-12-14 | 2009-12-14 | Cross-linked oil-in-water emulsified fracturing fluid |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103773352A (en) * | 2014-01-08 | 2014-05-07 | 四川川庆井下科技有限公司 | Foam flow fracturing fluid |
| CN111117590A (en) * | 2018-11-01 | 2020-05-08 | 中国石油化工股份有限公司 | Crosslinked emulsified acid, preparation method and application |
-
2009
- 2009-12-14 CN CN2009102167516A patent/CN102093881A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103773352A (en) * | 2014-01-08 | 2014-05-07 | 四川川庆井下科技有限公司 | Foam flow fracturing fluid |
| CN111117590A (en) * | 2018-11-01 | 2020-05-08 | 中国石油化工股份有限公司 | Crosslinked emulsified acid, preparation method and application |
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Application publication date: 20110615 |