CN102504797B - Multifunctional clean fracturing fluid - Google Patents
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- CN102504797B CN102504797B CN 201110374771 CN201110374771A CN102504797B CN 102504797 B CN102504797 B CN 102504797B CN 201110374771 CN201110374771 CN 201110374771 CN 201110374771 A CN201110374771 A CN 201110374771A CN 102504797 B CN102504797 B CN 102504797B
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Abstract
The invention discloses a multifunctional clean fracturing fluid which is prepared by mixing the following raw materials by mass percent: C10-C22 alkyl di-hydroxyethyl betaine 1% to 4%, complexant 0.05% to 0.5%, clay stabilizer 0.01% to 1.5%, mahogany sulfonate 3% to 10%, pH regulator 0.01% to 1%, micelle stabilizer 0.01% to 1%, and water in balancing amount. The multifunctional clean fracturing fluid has the advantages of low cost, small harm and excellent performances, belongs to a micromolecule viscoelastic surfactant system, and is convenient and residue-free in preparation; when the multifunctional clean fracturing fluid is used, the addition of gel breaker is not needed, gel breaking can be realized under the condition of no hydrocarbon in an oil well, and the gel breaking speed is higher in case of encountering hydrocarbons in the oil well; and in the back flow process after the gel breaking, the multifunctional clean fracturing fluid serves the functions of dredging and cleaning a seepage channel of raw oil, which can maximize the fracturing construction effect.
Description
Technical field
The invention belongs to the petrochemical technology field, be specifically related to a kind of Multifunctional clean fracturing fluid.
Background technology
In China's verified oil reserves, low-permeability oilfield occupies the share more than 1/4th.Along with most of oil field enters high water-cut stage, development difficulty is increasing, and China's oil is stable to have great importance to keeping to develop good this type of oil field.
Pressure break is the major measure of crude oil volume increase stable yields.Fracturing liquid is divided into aqueous fracturing fluid, oil base fracturing fluid, the last fracturing liquid of bubble, Emulsified fracturing fluid and clean fracturing fluid etc.Water base guar gum fracturing fluid is the groundwork liquid that the present on-the-spot pressure break of Yanchang Oilfield is used.Fracturing effect statistics shows: after pressure break the stable yields cycle short, fracturing effect is poor.Reason is that its thickening material guar gum that contains is that water-insoluble is large by the macromolecular substance of vegetable jelly chemical modification; Fracturing liquid breaks at low temperatures glue and degradation effect is poor, residue is high, the row's of returning efficient is low; Fracturing liquid easily forms at the crack wall filter cake partition fluid seepage channel that hard degradation is removed; The filtrate that enters in the stratum can produce " water-sensitive and water lock ", and increases the weight of the injury to reservoir, and this injury is generally more than 30%; In addition, along with breaking glue solution continues to flow to the immediate vicinity of wellbore, a large amount of not degradable breaking glue solution residues are gathered near perforation, have blocked the fluid seepage channel, cause finally that the steady output of oilwell time is short after pressure break, fracturing effect is poor.
A kind of well fracturing production-increasing technique by the research and development of Schlunberger company is cationic VES clean fracturing fluid.This fracturing liquid is a kind of viscoelastic surfactant type fracturing liquid of non-polymer, have effective without residue, anti-clayswelling, it has overcome the shortcoming of guar gum fracturing fluid, be a revolutionary change of guar gum fracturing fluid technology, be considered to the highest level of aqueous fracturing fluid technology.But, to think through the Test Effect Analysis in the oil field in recent years, the wellfracturing effect more than 90% is suitable with water base guar gum fracturing fluid effect, and the pressure break result is unsatisfactory.Trace it to its cause, the VES clean fracturing fluid belongs to cationic, and it is with electronegative rock surface generation adsorption phenomena, has changed wettability of rock surface, thereby causes reservoir permeability to descend.In addition, this fracturing fluid system does not need to add in superoxide or biological enzyme etc. the phase gel breaker and realizes after pressing crack construction finishes of the fracturing fluid broken glue and the row of returning fast in pressing crack construction process.To be the VES fracturing liquid meet hydrocarbons such as crude oil and oil reservoir gas or certain density local water to of the fracturing fluid dilution at reservoir to its rubber breaker reason, just can realize the even broken glue of fracturing liquid viscosity degradation, therefore, rely on foreign minister's material rather than interior phase material to realize brokenly the VES fracturing liquid of glue, at the scene in the construction, if the VES fracturing liquid can not be met with oil, water in the stratum, viscoelastic colloidal is difficult to broken glue and turns back to ground after pressure break finishes; In addition, 60%～80% VES liquid rests on support belt, after pressure break finishes, only depend on oil, the water of foreign minister's gel breaker can not will be trapped in rapidly in a short time the VES Gel Breakdown in support belt, therefore, the colloid that rests on this just as one stifled " enclosure wall " blocking-up oil gas and extraneous seepage channel, result must cause oil and gas production after pressure break not increase and the result that subtracts.In addition, the pressure break liquid effluent does not have to clean and dredge the effect in fluid seepage flow duct, does not have recovery value, has increased the processing costs of waste liquid.Therefore, this fracturing liquid applying with scale at the scene is restricted.
External research in this respect is more, from positively charged ion, negatively charged ion, nonionic and both sexes clean fracturing fluid, relevant paper and patent report is arranged all.up to the present, domesticly only retrieve two pieces of related articles on various open publications, a kind of extremely low of the fracturing fluid development of anionic VES of rate and application (oilfield chemistry 2008 thereof of injuring of the research such as Zhang Jing wherein, 2 phases 25 volumes), the anion surfactant fracturing liquid that Ding Li etc. deliver is developed and is used (oil and gas chemical industry 2010 at Soviet Union's Sulige gas field, 4 phases 39 volumes) and the D3F-AS05 clean fracturing fluid in application (gas prospecting and the exploitation of Sulige gas field, Ordos Basin, 2010,1 phases 33 volume) be present latest domestic research and application report.It is reported this anionic fracturing liquid, cost is high, must could form viscoelastic colloidal under higher concentration salt (6%KCl) solution and alkaline environment during use.Inapplicable for the quick property of salt reservoir like this.In addition, this fracturing liquid also will rely on the foreign minister to break glue, and under the environment without hydrocarbon, of the fracturing fluid broken colloidality is restricted; Liquid effluent is not fully utilized yet, only be confined to pressure break and take the sand effect.Therefore, affect fracturing liquid and used and applied effect.
Take a broad view of the development of domestic and international fracturing liquid, the main task of fracturing working fluid is make seam and take sand, and therefore, low injury, environmental protection, efficient, compound fracturing liquid are the developing direction of fracturing working fluid from now on.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned the deficiencies in the prior art, provides that a kind of production cost is low, injury is little, the Multifunctional clean fracturing fluid of excellent performance.This fracturing liquid has the effect that the crude oil seepage flow passage is cleaned in dredging in the fracturing fluid recovery (backflow) process when satisfying the well fracturing volume increase, can realize the pressing crack construction maximum effect.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of Multifunctional clean fracturing fluid, it is characterized in that, and mixed by the raw material of following mass percent: C
10-C
22Alkyl dihydroxy ethyl trimethyl-glycine 1%～4%, complexing agent 0.05%～0.5%, clay stabilizer 0.01%～1.5%, petroleum-sulfonate 3%～10%, pH adjusting agent 0.01%～1%, micella stablizer 0.01%～1%, surplus is water; Described complexing agent is sodium ethylene diamine tetracetate, and described clay stabilizer is NH
4Cl or KCl, described petroleum-sulfonate are C
10-C
18Alkylsulfonate or C
10-C
18Alkylbenzene sulfonate, described pH adjusting agent are trolamine, diethanolamine, thanomin or ammoniacal liquor, and described micella stablizer is polyoxyethylene nonylphenol ether or C
4-C
14Alcohol.
Above-mentioned a kind of Multifunctional clean fracturing fluid is mixed by the raw material of following mass percent: C
10-C
22Alkyl dihydroxy ethyl trimethyl-glycine 2%～3%, complexing agent 0.1%～0.3%, clay stabilizer 0.1%～1%, petroleum-sulfonate 5%～8%, pH adjusting agent 0.1%～0.4%, micella stablizer 0.05%～0.5%, surplus is water.
Above-mentioned a kind of Multifunctional clean fracturing fluid is mixed by the raw material of following mass percent: C
10-C
22Alkyl dihydroxy ethyl trimethyl-glycine 2.5%, complexing agent 0.2%, clay stabilizer 0.8%, petroleum-sulfonate 6.5%, pH adjusting agent 0.2%, micella stablizer 0.3%, surplus is water.
The preparation method of clean fracturing fluid of the present invention is:
Step 1, with C
10-C
22Kiber alkyl amine and oxyethane carry out ethoxylation under alkaline condition, generate dihydroxy ethyl C
10-C
22Alkylamine; The temperature of reaction of described ethoxylation is 75 ℃～80 ℃, and the reaction times is 3h～4h; Described C
10-C
22The mol ratio of kiber alkyl amine and oxyethane is 1: 2～2.2;
Step 2, with the C of dihydroxy ethyl described in step 1
10-C
22Alkylamine and Mono Chloro Acetic Acid carry out quaterisation, generate C
10-C
22Alkyl dihydroxy ethyl trimethyl-glycine; The temperature of reaction of described quaterisation is 75 ℃～80 ℃, and the reaction times is 3h～4h; Described dihydroxy ethyl C
10-C
22Alkylamine and chloroacetic mol ratio are 1: 1～1.2;
Step 3, with C described in step 2
10-C
22Alkyl dihydroxy ethyl trimethyl-glycine and complexing agent, clay stabilizer, C
10-C
18Alkylsulfonate, pH adjusting agent, micella stablizer and water mix in proportion, and obtain clean fracturing fluid.
Multifunctional clean fracturing fluid of the present invention carries propping agent according to ordinary method when using and pumps in oil well.
Multifunctional clean fracturing fluid of the present invention has pressure break and two kinds of functions of the displacement of reservoir oil, after clean fracturing fluid enters oil well, contact rear thinning with the hydrocarbons in oil well, do not need additionally to add gel breaker can realize brokenly glue, fracturing liquid after broken glue has cleaning and peels off crude oil in the row's of returning process, the effect of dredging fluid seepage channel, play the effect of again cleaning and dredging of breaking glue solution to close passage after pressure break dredging macropore and pressure break, improve to greatest extent fracturing effect (this technology be before all fracturing liquids institutes inaccessiable), finally reach the purpose of stable yields volume increase.Fracturing liquid after broken glue is discharged the stratum and can be reclaimed, and the spearhead when constructing as wellfracturing next time and displacing liquid use, and have not only reduced cost, have protected environment, and the Sustainable development of keeping the oil field is had important strategy and realistic meaning.
The present invention compared with prior art has the following advantages:
1, clean fracturing fluid production cost of the present invention low, the injury little, excellent performance, this fracturing liquid belongs to small molecules viscoelastic surfactant system, easy to prepare, without residue, when satisfying the well fracturing volume increase, fracturing liquid after broken glue has the effect that the crude oil seepage flow passage is cleaned in dredging in the row's of returning process, can realize the pressing crack construction maximum effect.
2, clean fracturing fluid of the present invention does not in use need again with gel breaker, in the situation that can realize brokenly glue without hydrocarbons in oil well, during hydrocarbons in meeting oil well, broken glue speed is faster, overcome " wall " effect that fracturing liquid rubber-breaking does not thoroughly cause, avoided the injury that fracturing fluid recovery (backflow) efficient is low and delay causes; In addition, the fracturing liquid after broken glue has significant oil displacement efficiency, can realize peeling off and cleaning the rock surface surplus oil in the row's of returning process.
3, discharging the stratum after fracturing liquid rubber-breaking of the present invention can reclaim; spearhead when constructing as wellfracturing next time and displacing liquid use; not only reduced cost, protected environment, the Sustainable development of keeping the oil field has been had important strategy and realistic meaning.
Below by embodiment, technical scheme of the present invention is described in further detail.
Embodiment
Embodiment 1
The Multifunctional clean fracturing fluid of the present embodiment is mixed by the raw material of following mass percent: decyl dihydroxy ethyl trimethyl-glycine 1%, complexing agent 0.05%, clay stabilizer 0.01%, petroleum-sulfonate 10%, pH adjusting agent 0.01%, micella stablizer 0.01%, surplus are water; Described complexing agent is sodium ethylene diamine tetracetate, and described clay stabilizer is NH
4Cl, described petroleum-sulfonate are the decyl sodium sulfonate, and described pH adjusting agent is trolamine, and described micella stablizer is polyoxyethylene nonylphenol ether.
The preparation method of the Multifunctional clean fracturing fluid of the present embodiment is:
Step 1, decyl primary amine and oxyethane are carried out ethoxylation under alkaline condition, generate the dihydroxy ethyl decyl amine; The temperature of reaction of described ethoxylation is 75 ℃, and the reaction times is 4h; The mol ratio of described decyl primary amine and oxyethane is 1: 2;
Step 2, the decyl amine of dihydroxy ethyl described in step 1 and Mono Chloro Acetic Acid are carried out quaterisation, generate decyl dihydroxy ethyl trimethyl-glycine; The temperature of reaction of described quaterisation is 75 ℃, and the reaction times is 4h; Described dihydroxy ethyl decyl amine and chloroacetic mol ratio are 1: 1;
Step 3, the dihydroxy ethyl trimethyl-glycine of decyl described in step 2 and complexing agent, clay stabilizer, petroleum-sulfonate, pH adjusting agent, micella stablizer and water are mixed in proportion, obtain Multifunctional clean fracturing fluid.
The clean fracturing fluid of the present embodiment carries propping agent according to ordinary method when using and pumps in oil well.
Embodiment 2
The present embodiment is identical with embodiment 1, and wherein difference is: described pH adjusting agent is diethanolamine, thanomin or ammoniacal liquor, and described petroleum-sulfonate is C
10-C
18Alkylbenzene sulfonate, described micella stablizer is C
4-C
14Alcohol.
Embodiment 3
The Multifunctional clean fracturing fluid of the present embodiment is mixed by the raw material of following mass percent: dodecyl dihydroxy ethyl trimethyl-glycine 4%, complexing agent 0.5%, clay stabilizer 1%, petroleum-sulfonate 3%, pH adjusting agent 0.2%, micella stablizer 0.5%, surplus are water; Described complexing agent is sodium ethylene diamine tetracetate, and described clay stabilizer is KCl, and described petroleum-sulfonate is sodium cetanesulfonate, and described pH adjusting agent is diethanolamine, and described micella stablizer is butanols.
The preparation method of the Multifunctional clean fracturing fluid of the present embodiment is:
Step 1, dodecyl primary amine and oxyethane are carried out ethoxylation under alkaline condition, generate the dihydroxy ethyl lauryl amine; The temperature of reaction of described ethoxylation is 80 ℃, and the reaction times is 3h; The mol ratio of described dodecyl primary amine and oxyethane is 1: 2.2;
Step 2, the lauryl amine of dihydroxy ethyl described in step 1 and Mono Chloro Acetic Acid are carried out quaterisation, generate dodecyl dihydroxy ethyl trimethyl-glycine; The temperature of reaction of described quaterisation is 80 ℃, and the reaction times is 3h; Described dihydroxy ethyl lauryl amine and chloroacetic mol ratio are 1: 1.2;
Step 3, the dihydroxy ethyl trimethyl-glycine of dodecyl described in step 2 and complexing agent, clay stabilizer, petroleum-sulfonate, pH adjusting agent, micella stablizer and water are mixed in proportion, obtain Multifunctional clean fracturing fluid.
The clean fracturing fluid of the present embodiment carries propping agent according to ordinary method when using and pumps in oil well.
Embodiment 4
The present embodiment is identical with embodiment 3, and wherein difference is: described pH adjusting agent is trolamine, thanomin or ammoniacal liquor, and described petroleum-sulfonate is C
10-C
18Alkylbenzene sulfonate, described micella stablizer is polyoxyethylene nonylphenol ether or C
5-C
14Alcohol.
Embodiment 5
The Multifunctional clean fracturing fluid of the present embodiment is mixed by the raw material of following mass percent: octadecyl dihydroxy ethyl trimethyl-glycine 2%, complexing agent 0.1%, clay stabilizer 0.1%, petroleum-sulfonate 5%, pH adjusting agent 0.4%, micella stablizer 0.1%, surplus are water; Described complexing agent is sodium ethylene diamine tetracetate, and described clay stabilizer is KCl, and described petroleum-sulfonate is Sodium dodecylbenzene sulfonate, and described pH adjusting agent is thanomin, and described micella stablizer is dodecanol.
The preparation method of the Multifunctional clean fracturing fluid of the present embodiment is:
Step 1, octadecyl primary amine and oxyethane are carried out ethoxylation under alkaline condition, generate the dihydroxy ethyl octadecylamine; The temperature of reaction of described ethoxylation is 78 ℃, and the reaction times is 3.5h; The mol ratio of described octadecyl primary amine and oxyethane is 1: 2.1;
Step 2, the octadecylamine of dihydroxy ethyl described in step 1 and Mono Chloro Acetic Acid are carried out quaterisation, generate octadecyl dihydroxy ethyl trimethyl-glycine; The temperature of reaction of described quaterisation is 78 ℃, and the reaction times is 3.5h; Described dihydroxy ethyl octadecylamine and chloroacetic mol ratio are 1: 1.1;
Step 3, the dihydroxy ethyl trimethyl-glycine of octadecyl described in step 2 and complexing agent, clay stabilizer, petroleum-sulfonate, pH adjusting agent, micella stablizer and water are mixed in proportion, obtain Multifunctional clean fracturing fluid.
The clean fracturing fluid of the present embodiment carries propping agent according to ordinary method when using and pumps in oil well.
Embodiment 6
The present embodiment is identical with embodiment 5, and wherein difference is: described pH adjusting agent is trolamine, diethanolamine or ammoniacal liquor, and described petroleum-sulfonate is C
10-C
18Alkylsulfonate, described micella stablizer is polyoxyethylene nonylphenol ether, C
4-C
11Alcohol or C
12-C
14Alcohol.
Embodiment 7
The Multifunctional clean fracturing fluid of the present embodiment is mixed by the raw material of following mass percent: docosyl dihydroxy ethyl trimethyl-glycine 3%, complexing agent 0.3%, clay stabilizer 1%, petroleum-sulfonate 8%, pH adjusting agent 0.1%, micella stablizer 0.4%, surplus are water; Described complexing agent is sodium ethylene diamine tetracetate, and described clay stabilizer is NH
4Cl, described petroleum-sulfonate are the octadecyl sodium sulfonate, and described pH adjusting agent is ammoniacal liquor, and described micella stablizer is polyoxyethylene nonylphenol ether.
The preparation method of the Multifunctional clean fracturing fluid of the present embodiment is:
Step 1, docosyl primary amine and oxyethane are carried out ethoxylation under alkaline condition, generate dihydroxy ethyl docosyl amine; The temperature of reaction of described ethoxylation is 80 ℃, and the reaction times is 4h; The mol ratio of described docosyl primary amine and oxyethane is 1: 2;
Step 2, the docosyl amine of dihydroxy ethyl described in step 1 and Mono Chloro Acetic Acid are carried out quaterisation, generate docosyl dihydroxy ethyl trimethyl-glycine; The temperature of reaction of described quaterisation is 75 ℃, and the reaction times is 3h; Described dihydroxy ethyl docosyl amine and chloroacetic mol ratio are 1: 1～1.2;
Step 3, the dihydroxy ethyl trimethyl-glycine of docosyl described in step 2 and complexing agent, clay stabilizer, petroleum-sulfonate, pH adjusting agent, micella stablizer and water are mixed in proportion, obtain Multifunctional clean fracturing fluid.
The clean fracturing fluid of the present embodiment carries propping agent according to ordinary method when using and pumps in oil well.
Embodiment 8
The present embodiment is identical with embodiment 7, and wherein difference is: described pH adjusting agent is trolamine, diethanolamine or thanomin, and described petroleum-sulfonate is C
10-C
18Alkylbenzene sulfonate, described micella stablizer is C
4-C
14Alcohol.
Embodiment 9
The Multifunctional clean fracturing fluid of the present embodiment is mixed by the raw material of following mass percent: octadecyl dihydroxy ethyl trimethyl-glycine 2.5%, complexing agent 0.2%, clay stabilizer 0.8%, petroleum-sulfonate 6.5%, pH adjusting agent 0.3%, micella stablizer 0.3%, surplus are water; Described complexing agent is sodium ethylene diamine tetracetate, and described clay stabilizer is KCl, and described petroleum-sulfonate is sodium laurylsulfonate, and described pH adjusting agent is trolamine, and described micella stablizer is enanthol.
The preparation method of the Multifunctional clean fracturing fluid of the present embodiment is:
Step 1, octadecyl primary amine and oxyethane are carried out ethoxylation under alkaline condition, generate the dihydroxy ethyl octadecylamine; The temperature of reaction of described ethoxylation is 80 ℃, and the reaction times is 3h; The mol ratio of described octadecyl primary amine and oxyethane is 1: 2.2;
Step 2, the octadecylamine of dihydroxy ethyl described in step 1 and Mono Chloro Acetic Acid are carried out quaterisation, generate octadecyl dihydroxy ethyl trimethyl-glycine; The temperature of reaction of described quaterisation is 80 ℃, and the reaction times is 4h; Described dihydroxy ethyl octadecylamine and chloroacetic mol ratio are 1: 1.2;
Step 3, the dihydroxy ethyl trimethyl-glycine of octadecyl described in step 2 and complexing agent, clay stabilizer, petroleum-sulfonate, pH adjusting agent, micella stablizer and water are mixed in proportion, obtain Multifunctional clean fracturing fluid.
The clean fracturing fluid of the present embodiment carries propping agent according to ordinary method when using and pumps in oil well.
Embodiment 10
The present embodiment is identical with embodiment 9, and wherein difference is: described pH adjusting agent is diethanolamine, thanomin or ammoniacal liquor, and described petroleum-sulfonate is C
10-C
18Alkylbenzene sulfonate, described micella stablizer is polyoxyethylene nonylphenol ether, C
4-C
6Alcohol or C
8-C
14Alcohol.
Embodiment 11
The Multifunctional clean fracturing fluid of the present embodiment is mixed by the raw material of following mass percent: pentadecyl dihydroxy ethyl trimethyl-glycine 2.8%, complexing agent 0.2%, clay stabilizer 0.7%, petroleum-sulfonate 7%, pH adjusting agent 0.2%, micella stablizer 0.2%, surplus are water; Described complexing agent is sodium ethylene diamine tetracetate, and described clay stabilizer is KCl, and described petroleum-sulfonate is the pentadecyl benzene sulfonic acid sodium salt, and described pH adjusting agent is thanomin, and described micella stablizer is polyoxyethylene nonylphenol ether.
The preparation method of Multifunctional clean fracturing fluid of the present invention is:
Step 1, pentadecyl primary amine and oxyethane are carried out ethoxylation under alkaline condition, generate dihydroxy ethyl pentadecyl amine; The temperature of reaction of described ethoxylation is 75 ℃, and the reaction times is 4h; The mol ratio of described pentadecyl primary amine and oxyethane is 1: 2;
Step 2, the pentadecyl amine of dihydroxy ethyl described in step 1 and Mono Chloro Acetic Acid are carried out quaterisation, generate pentadecyl dihydroxy ethyl trimethyl-glycine; The temperature of reaction of described quaterisation is 75 ℃, and the reaction times is 4h; Described dihydroxy ethyl pentadecyl amine and chloroacetic mol ratio are 1: 1;
Step 3, the dihydroxy ethyl trimethyl-glycine of pentadecyl described in step 2 and complexing agent, clay stabilizer, petroleum-sulfonate, pH adjusting agent, micella stablizer and water are mixed in proportion, obtain Multifunctional clean fracturing fluid.
The clean fracturing fluid of the present embodiment carries propping agent according to ordinary method when using and pumps in oil well.
Embodiment 12
The present embodiment is identical with embodiment 11, and wherein difference is: described pH adjusting agent is trolamine, diethanolamine or ammoniacal liquor, and described petroleum-sulfonate is C
10-C
18Alkylsulfonate, described micella stablizer is C
4-C
14Alcohol.
After clean fracturing fluid of the present invention carries oil well with propping agent, contact rear thinning with the hydrocarbons in oil well, do not need additionally to add gel breaker can realize brokenly glue, fracturing liquid after broken glue has cleaning and peels off crude oil in the row's of returning process, the effect of dredging fluid seepage channel, play the effect of again cleaning and dredging of breaking glue solution to close passage after pressure break dredging macropore and pressure break, improve to greatest extent fracturing effect (this technology be before all fracturing liquids institutes inaccessiable), finally reach the purpose of stable yields volume increase.
Multifunctional clean fracturing fluid of the present invention has been carried out comparative analysis in the performance of existing clean fracturing fluid, and concrete outcome sees the following form:
Three kinds of clean fracturing fluid performance comparison of table 1 are analyzed
As can be seen from Table 1, clean fracturing fluid of the present invention is starkly lower than existing fracturing liquid to the injury of rock core and propping agent, and cost is starkly lower than the GRF clean fracturing fluid, and is suitable with VES clean fracturing fluid cost; And clean fracturing fluid of the present invention is having hydrocarbons or without all breaking voluntarily glue under hydrocarbons, fracturing liquid after broken glue has cleaning and peels off crude oil in the row's of returning process, the effect of dredging fluid seepage channel, play the effect of again cleaning and dredging of breaking glue solution to close passage after pressure break dredging macropore and pressure break, improve to greatest extent fracturing effect; Fracturing liquid after broken glue is discharged the stratum and can be reclaimed, and the spearhead when constructing as wellfracturing next time and displacing liquid use, and have not only reduced cost, have protected environment, and the Sustainable development of keeping the oil field is had important strategy and realistic meaning.
In addition, oil displacement efficiency after the broken glue of clean fracturing fluid of the present invention is tested, long 2 natural cores in Yanchang Oilfield Zi Bei oil field are chosen in test, simulation reservoir physical condition utilizes displacement test to estimate the filming flooding agent oil displacement efficiency, is specially: first with rock core vacuumizing, and with filtering two rivers sewage saturated core, saturated water amount is determined in weighing, reaches the irreducible water state with oily expelling water under 35 ℃, and calculates oil saturation; Then reach 98% at 35 ℃ of lower water drive to water ratio, calculate oil-water displacement efficiency; Then inject the injectant (fracturing liquid after conventional oil-displacing agent or broken glue) of 0.5PV (volume of voids) left and right, the injectant mass concentration is 0.5%, and absorption 24h carries out water drive again, and water drive is to water ratio 98%, calculate final oil displacement efficiency, the results are shown in following table:
Of the fracturing fluid oil displacement efficiency after the broken glue of table 2
As can be seen from Table 2, oil well is carried out the displacement of reservoir oil after adopting fracturing liquid rubber-breaking of the present invention, the oil displacement efficiency of oil displacement efficiency and conventional oil-displacing agent is without significant difference, but illustrates after fracturing liquid rubber-breaking of the present invention that in the row's of returning process, the convection cell seepage channel carries out the displacement of reservoir oil.
Clean fracturing fluid of the present invention has pressure break and two kinds of functions of the displacement of reservoir oil, and clean fracturing fluid does not need additionally to add gel breaker after entering oil well, can realize broken glue with thinning after hydrocarbons in oil well contacts, and also can automatically break glue under environment existing without hydrocarbon materials; Fracturing liquid after broken glue has cleaning and peels off crude oil in the row's of returning process, the effect of dredging fluid seepage channel, play the effect of again cleaning and dredging of breaking glue solution to close passage after pressure break dredging macropore and pressure break, improve to greatest extent fracturing effect (this technology be before all fracturing liquids institutes inaccessiable), finally reach the purpose of stable yields volume increase.Fracturing liquid after broken glue is discharged the stratum and can be reclaimed, and the spearhead when constructing as wellfracturing next time and displacing liquid use, and have not only reduced cost, have protected environment, and the Sustainable development of keeping the oil field is had important strategy and realistic meaning.
The above; it is only preferred embodiment of the present invention; be not that the present invention is done any restriction, every any simple modification, change and equivalent structure of above embodiment being done according to the invention technical spirit changes, and all still belongs in the protection domain of technical solution of the present invention.
Claims (2)
1. a Multifunctional clean fracturing fluid, is characterized in that, mixed by the raw material of following mass percent: C
10-C
22Alkyl dihydroxy ethyl trimethyl-glycine 1%～4%, complexing agent 0.05%～0.5%, clay stabilizer 0.01%～1.5%, petroleum-sulfonate 3%～10%, pH adjusting agent 0.01%～1%, micella stablizer 0.01%～1%, surplus is water; Described complexing agent is sodium ethylene diamine tetracetate, and described clay stabilizer is NH
4Cl or KCl, described petroleum-sulfonate are C
10-C
18Alkylsulfonate or C
10-C
18Alkylbenzene sulfonate, described pH adjusting agent are trolamine, diethanolamine, thanomin or ammoniacal liquor, and described micella stablizer is polyoxyethylene nonylphenol ether or C
4-C
14Alcohol.
2. a kind of Multifunctional clean fracturing fluid according to claim 1, is characterized in that, mixed by the raw material of following mass percent: C
10-C
22Alkyl dihydroxy ethyl trimethyl-glycine 2%～3%, complexing agent 0.1%～0.3%, clay stabilizer 0.1%～1%, petroleum-sulfonate 5%～8%, pH adjusting agent 0.1%～0.4%, micella stablizer 0.05%～0.5%, surplus is water.
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| CN 201110374771 CN102504797B (en) | 2011-11-22 | 2011-11-22 | Multifunctional clean fracturing fluid |
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| CN102504797B true CN102504797B (en) | 2013-05-08 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104789201A (en) * | 2014-01-22 | 2015-07-22 | 中国石油化工股份有限公司 | Compound oil displacement agent and application thereof |
| CN106928952A (en) * | 2015-12-29 | 2017-07-07 | 核工业北京化工冶金研究院 | A kind of delayed cross-linking polymeric system |
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| CN102851018A (en) * | 2012-09-18 | 2013-01-02 | 中国石油集团川庆钻探工程有限公司 | Recyclable surfactant fracturing fluid and reutilization method |
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| CN109337663A (en) * | 2018-11-19 | 2019-02-15 | 中国石油集团川庆钻探工程有限公司工程技术研究院 | Low permeability reservoir continuous mixed displacement of reservoir oil type fracturing fluid and its preparation method and application |
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| CN111073626A (en) * | 2019-12-30 | 2020-04-28 | 陕西省石油化工研究设计院 | Clean fracturing fluid for low-permeability, high-temperature-resistant and high-pressure-resistant reservoir and preparation method thereof |
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| CN113943567A (en) * | 2021-10-20 | 2022-01-18 | 西安石油大学 | Gel breaking method of clean fracturing fluid in hydrocarbon-free environment and application |
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| US8720571B2 (en) * | 2007-09-25 | 2014-05-13 | Halliburton Energy Services, Inc. | Methods and compositions relating to minimizing particulate migration over long intervals |
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| CN1263481A (en) * | 1997-06-10 | 2000-08-16 | 罗狄亚公司 | Fluids containing viscoelastic surfactant and methods for using the same |
| CN101553552A (en) * | 2006-10-24 | 2009-10-07 | 普拉德研究及开发股份有限公司 | Degradable material assisted diversion |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104789201A (en) * | 2014-01-22 | 2015-07-22 | 中国石油化工股份有限公司 | Compound oil displacement agent and application thereof |
| CN106928952A (en) * | 2015-12-29 | 2017-07-07 | 核工业北京化工冶金研究院 | A kind of delayed cross-linking polymeric system |
| CN106928952B (en) * | 2015-12-29 | 2020-02-21 | 核工业北京化工冶金研究院 | Delayed crosslinking polymer system |
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