CN102994065A - Preparation technique of clean fracturing fluid on basis of control on surfactant addition amount - Google Patents
Preparation technique of clean fracturing fluid on basis of control on surfactant addition amount Download PDFInfo
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- CN102994065A CN102994065A CN 201110290020 CN201110290020A CN102994065A CN 102994065 A CN102994065 A CN 102994065A CN 201110290020 CN201110290020 CN 201110290020 CN 201110290020 A CN201110290020 A CN 201110290020A CN 102994065 A CN102994065 A CN 102994065A
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Abstract
The invention discloses a preparation technique of a clean fracturing fluid on the basis of control on surfactant addition amount, which comprises the following steps: (a) firstly, adding 1.8-2.2% surfactant into a brine solution, and stirring for some time; (b) secondly, while stirring, adding a certain amount of sodium salicylate, and sufficiently stirring to obtain a solution; and (c) finally, storing in a thermostatic water bath for some time to implement sufficient defoaming, thereby obtaining the clean fracturing fluid. By controlling the surfactant addition amount, the invention can greatly increase the viscosity number of the whole system, thereby enhancing the product quality of the prepared clean fracturing fluid.
Description
Technical field
The present invention relates to a kind of clean fracturing liquid preparing process, specifically refer to a kind of clean fracturing liquid preparing process based on control surface promoting agent dosage.
Background technology
The Fracturing of Oil/gas Well is the effective ways of transforming hydrocarbon zone, is the effective measure of Oil/gas Well, well volume increase, augmented injection.This technology has accumulated the experience in more than 50 year, is widely used in exploration of oil and gas field and the exploitation.Meanwhile, every annual meeting consumes 6 * 10
4The chemical agent that ton is above.
So-called petrofracturing for being imbedded in the oil reservoir of hundreds of to several kms, utilizes the effect of waterpower exactly, makes oil reservoir form the crack.The process of petrofracturing, refer generally to adopt on ground the pump of high-pressure large-displacement, utilize the pressure transmission performance of liquid, the liquid (fracturing liquid) that will have certain viscosity, inject in well to substantially exceed the absorbent ability of oil reservoir, pressure in the pit shaft increases gradually, when increased pressure to above the tensile strength of the terrestrial stress of Around A Borehole and rock the time, oil reservoir will be formed with the crack of certain geometrical dimension.Because the appearance in crack, infiltrating area increases, and has pressure reduction between bottomhole wellbore pressure and the sand pressure in addition, the liquid that pump into this moment, and wherein a part has satisfied the absorption on stratum, and the remaining crack that then makes is extended forward and is expanded.Along with the continuous injection of fluid, the crack also can constantly be extended and expansion, until the speed that fluid injects is when speed that oil reservoir can suck equates, the crack just can stop to extend and expansion.If this moment, the ground high-pressure pump stopped pumping liquid, oil reservoir is because the disappearance of extraneous pressure can make again the crack again closed.Open the volt attitude in order to keep the crack to be in, along with of the fracturing fluid continuous injection, must in fracturing liquid, sneak into larger-diameter propping agent (such as quartz sand, nut-shell, haydite etc.), make it to be deposited in the crack, support established crack.Owing in the stratum supported like this crack has been arranged, thereby has improved the rate of permeation of rock stratum, immediate vicinity of wellbore, improved near the fluid flowing passage of the oil reservoir of pit shaft, increased the current drainage area, reduced the resistance to flow of fluid, make oil well reach the effect of volume increase.
Clean fracturing fluid is as making the medium that stitches and take sand, and the improvement of its performance is the problem that people study always.Since carrying out waterfrac treatment on a large scale the fifties, no matter significant change has all occured from formation, desk research plant and instrument and the method for individual event additive, integral hydraulic fracturing liquid formula system to rig-site utilization Technology etc. in fracturing liquid, particularly since the nineties, fracturing fluid system research is tending towards perfect, has brought into play vital role in fracturing liquid chemistry and rig-site utilization.
Clean fracturing fluid, abroad grow up the nineties in eighties of last century, since Schlumberger company in 1997 releases first product J 508 and puts goods on the market, just obtained rapidly popularization, three countries and regions of consumption maximum are respectively at present: Canada, the Gulfian and eastern united states.Simultaneously external scholar has greatly enriched Theory of Viscoelasticity by being devoted for years in visco-elasticity research, lays a good foundation for the theoretical investigation of VES, and the visco-elasticity evaluation method that obtains is that VES fracturing liquid performance evaluation has indicated direction.
Domestic late to clean fracturing fluid research, the main VES that uses is the J508 type tensio-active agent of CTAB and Schlumberger at present, the problem that exists is: the viscoelastic effect of CTAB comparatively a little less than, particularly when temperature is higher than 60 ℃, viscosity can reduce thereupon greatly, loses the Effective Suspension effect to propping agent.The J508 type tensio-active agent of Schlumberger has good visco-elasticity, applicable temperature is higher, owing to added some high-temperature stabiliser in its prescription, thereby this system is applied in the well production increment operation that temperature is higher than 100 ℃, but should the prescription cost high than CTAB so that this system at home large-scale application be restricted.Recent year also have the report different ingredients VES, the temperature of use also is enhanced, but about they application report also seldom.Say that from certain angle reason is owing to well do not consider the industrial problems of product the molecular designing, cause cost too high and restrict its application, another important reason is because domestic at present to the evaluation method of VES fluid imperfection also, causing has mistaken ideas to VES, and that is exactly the normal construction that reach great visco-elasticity guarantee pressure break.
At present, widely used clean fracturing liquid system can be divided into aqueous fracturing fluid, foamed fracturing fluid, oil base fracturing fluid and Emulsified fracturing fluid.As main from the beginning of the fifties to the beginning of the sixties take oil base fracturing fluid.Oil base fracturing fluid is comprised of hydro carbons (crude oil, diesel oil), viscosifying agent (organophosphate), linking agent (meta-aluminate) and gel breaker (strong base-weak acid salt) usually, by two step crosslinkings, its on-the-spot operability and temperature resistant capability (reaching 130 ℃) have been improved.It is good that it has with the oil reservoir compatibleness, and easily the row of returning, low injury are suitable for the advantages such as strong water-sensitive, low pressure reservoir.Simultaneously, have also that poor stability, cost are high, temperature resistant capability is weak and a shortcoming such as filter loss is large.At the beginning of the sixties, the appearance of your glue viscosifying agent of guanidine indicates the birth of modern fracturing liquid chemistry.The seventies, because the success of your gel modification (such as hydroxypropyl guanidine that glue HPG, hydroxyl carboxymethyl guanidine that glue CMHPG) of guanidine, and perfect (the developing into organic titanium, organic zirconium by boron, antimony) of cross-linking system, aqueous fracturing fluid develops rapidly, accounts for leading role in the fracturing liquid type.Aqueous fracturing fluid is by compositions such as polymer thickening agent (vegetable jelly is such as guanidine that glue, fenugreek gum etc.), linking agent, gel breaker, pH value conditioning agent, sterilant, clay stabilizer and cleanup additives.Have the characteristics such as cheap, safe, workable, good combination property, utilization scope be wide, but potential problem is the infringement sensitive reservoir, and because residue, the concentrated glue of broken glue and the flow conductivity infringement that filter cake causes.Along with factors such as the row's of returning difficulties after the exploitation of tight gas reservoir and the part low pressure oil well pressure break, the eighties foamed fracturing fluid technology use at the scene on a large scale again, replaced the part aqueous fracturing fluid.Foamed fracturing fluid generally is comprised of gas phase and liquid phase, gas phase (being generally 70%～75% CO2 or N2) is dispersed in the whole external phase with the form of bubble, liquid phase contains tensio-active agent or other stablizer usually, adds the vegetable jelly viscosifying agent, can improve the stability of foamed fracturing fluid.The characteristics such as it has easily the row of returning, injury is little and prop-carrying capacity is strong are suitable for low pressure, sensitive reservoir, especially gas reservoir.Emulsified fracturing fluid is the fracturing liquid fluid between water base and oil base, commonly used is the polymkeric substance oil-in-water emulsified fracturing fluid at present, it is comprised of 60%～70% liquid hydrocarbon (crude oil or diesel oil are interior phase) and 30%～40% polymkeric substance viscous water (the vegetable jelly aqueous solution is the foreign minister), has low leak-off, low residue, viscosity height and injures the characteristics such as less.At present, fracturing fluid system is still take aqueous fracturing fluid as main (accounting for 65%), foamed fracturing fluid (accounting for 30%), the situation of oil base, Emulsified fracturing fluid (accounting for 5%) coexistence.Wherein, in aqueous fracturing fluid, the crosslinked fracturing liquid of boron accounts for 40%, and titanium, the crosslinked fracturing liquid of zirconium account for 10%, and uncrosslinked fracturing liquid accounts for 15%.
The nineties in 20th century, developed non-polymer water-based fracturing liquid system abroad: a kind of fracturing liquid based on viscoelastic surfactant, this system does not need the broken glue of chemistry, the discharge opeing ability is strong, and fracturing fluid residue content is almost nil, does not substantially change the wettability of oil reservoir and can effectively stablize clay, make skin effect and oil layer pollution in the fracturing process less, even approach zero and pollute, can more effective raising oil well productivity, fully reach the purpose of hydrocarbon-bearing pool pressure break.This system is referred to as the viscoelastic surfactant fracturing liquid, is referred to as again clean fracturing fluid.
Clean fracturing fluid just is promoted rapidly after coming into operation abroad in 1997.Present Canadian consumption the first, the Gulfian the second, eastern united states the 3rd.China is owing to differ larger in interfacial chemistry and synthesis of surfactant field with developed country, and clean fracturing fluid develops also slower in China.
In the technological process of preparation clean fracturing fluid, the size of tensio-active agent dosage has very large impact to the system viscosity number of the product prepared, how to confirm goes out the tensio-active agent dosage an of the best, and the preparation technology of clean fracturing fluid is had far-reaching influence.
Summary of the invention
Purpose of the present invention is in order to overcome the deficiencies in the prior art and defective, a kind of clean fracturing liquid preparing process based on control surface promoting agent dosage is provided, this preparation technology is by the dosage of control surface promoting agent, thereby can greatly increase the viscosity number of whole system, and then improve the quality product of the clean fracturing fluid of preparing.
Purpose of the present invention is achieved through the following technical solutions:
Clean fracturing liquid preparing process based on control surface promoting agent dosage may further comprise the steps:
(a) at first, in salt brine solution, adding concentration is 1.8%～2.2% tensio-active agent, stirs for some time;
(b) then, under stirring state, add a certain amount of sodium salicylate, fully stir and obtain solution;
(c) last, in water bath with thermostatic control, preserve for some time so that abundant froth breaking namely gets clean fracturing fluid.
Further, described salt brine solution is sodium chloride solution.
Described tensio-active agent be palmityl trimethyl ammonium chloride.
The concentration of described tensio-active agent is 2.0%.
In sum, the invention has the beneficial effects as follows: this preparation technology passes through the dosage of control surface promoting agent, thereby can greatly increase the viscosity number of whole system, and then improves the quality product of the clean fracturing fluid of preparing.
Description of drawings
Fig. 1 is that the sodium salicylate dosage is on the synoptic diagram that affects of system viscosity number.
Embodiment
Below in conjunction with embodiment, to the detailed description further of the present invention's do, but embodiments of the present invention are not limited to this.
Embodiment:
The present invention relates to the clean fracturing liquid preparing process based on control surface promoting agent dosage, may further comprise the steps:
(a) at first, in salt brine solution, add proper amount of surfactant, stir for some time;
(b) then, under stirring state, add a certain amount of sodium salicylate, fully stir and obtain solution;
(c) last, in water bath with thermostatic control, preserve for some time so that abundant froth breaking namely gets clean fracturing fluid.
Above-mentioned salt brine solution is sodium chloride solution; Tensio-active agent be palmityl trimethyl ammonium chloride.
In order to obtain best tensio-active agent dosage, it is the optimum addition of palmityl trimethyl ammonium chloride, the present invention has done the system concentration affects experiment of tensio-active agent dosage to clean fracturing fluid, the result as shown in Figure 1, for the sake of simplicity, in Fig. 1, palmityl trimethyl ammonium chloride is adopted the english abbreviation of CTAC; As shown in Figure 1, along with the increase of palmityl trimethyl ammonium chloride dosage, the system viscosity of solution also increases greatly, and the concentration of palmityl trimethyl ammonium chloride is better between 1.8%～2.2%, and optimum concn is 2.0%.
The above only is preferred embodiment of the present invention, is not the present invention is done any pro forma restriction, and any simple modification, the equivalent variations on every foundation technical spirit of the present invention above embodiment done all fall within protection scope of the present invention.
Claims (4)
1. based on the clean fracturing liquid preparing process of control surface promoting agent dosage, it is characterized in that, may further comprise the steps:
(a) at first, in salt brine solution, adding concentration is 1.8%～2.2% tensio-active agent, stirs for some time;
(b) then, under stirring state, add a certain amount of sodium salicylate, fully stir and obtain solution;
(c) last, in water bath with thermostatic control, preserve for some time so that abundant froth breaking namely gets clean fracturing fluid.
2. the clean fracturing liquid preparing process based on control surface promoting agent dosage according to claim 1 is characterized in that, described salt brine solution is sodium chloride solution.
3. the clean fracturing liquid preparing process based on control surface promoting agent dosage according to claim 1 is characterized in that, described tensio-active agent be palmityl trimethyl ammonium chloride.
4. each described clean fracturing liquid preparing process based on control surface promoting agent dosage is characterized in that the concentration of described tensio-active agent is 2.0% according to claim 1～3.
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| CN 201110290020 CN102994065A (en) | 2011-09-14 | 2011-09-14 | Preparation technique of clean fracturing fluid on basis of control on surfactant addition amount |
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| CN 201110290020 CN102994065A (en) | 2011-09-14 | 2011-09-14 | Preparation technique of clean fracturing fluid on basis of control on surfactant addition amount |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104946230A (en) * | 2015-07-17 | 2015-09-30 | 延长油田股份有限公司南泥湾采油厂 | Clean fracturing fluid suitable for oil field water and preparing method thereof |
| CN108611082A (en) * | 2016-12-13 | 2018-10-02 | 中国石油天然气股份有限公司 | Clean fracturing fluid and preparation method thereof |
-
2011
- 2011-09-14 CN CN 201110290020 patent/CN102994065A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104946230A (en) * | 2015-07-17 | 2015-09-30 | 延长油田股份有限公司南泥湾采油厂 | Clean fracturing fluid suitable for oil field water and preparing method thereof |
| CN108611082A (en) * | 2016-12-13 | 2018-10-02 | 中国石油天然气股份有限公司 | Clean fracturing fluid and preparation method thereof |
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Application publication date: 20130327 |