CN107858143B - Method for directly recycling fracturing flowback fluid - Google Patents
Method for directly recycling fracturing flowback fluid Download PDFInfo
- Publication number
- CN107858143B CN107858143B CN201711060279.2A CN201711060279A CN107858143B CN 107858143 B CN107858143 B CN 107858143B CN 201711060279 A CN201711060279 A CN 201711060279A CN 107858143 B CN107858143 B CN 107858143B
- Authority
- CN
- China
- Prior art keywords
- fracturing
- fluid
- acid
- agent
- recycling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/66—Compositions based on water or polar solvents
- C09K8/68—Compositions based on water or polar solvents containing organic compounds
- C09K8/685—Compositions based on water or polar solvents containing organic compounds containing cross-linking agents
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/605—Compositions for stimulating production by acting on the underground formation containing biocides
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
- C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/885—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
- C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/90—Compositions based on water or polar solvents containing organic compounds macromolecular compounds of natural origin, e.g. polysaccharides, cellulose
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/24—Bacteria or enzyme containing gel breakers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/26—Gel breakers other than bacteria or enzymes
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses a method for directly recycling fracturing flowback fluid, which comprises the following steps: settling and sand production: removing a propping agent and mechanical impurities in the fracturing flow-back fluid by using a settling tank, and then transferring the fracturing flow-back fluid to a tank for storage; and (4) sterilization and preservation: adding a bactericide into the liquid storage tank to inhibit bacterial reproduction; flocculation shielding: adding a flocculation shielding agent before liquid preparation to shield metal high-valence ions; adjusting the pH value: the thickening agent is convenient to thicken under the weak acidic condition; and then sequentially adding additives such as a thickening agent, a cleanup additive, a clay stabilizer and the like according to a designed formula, circulating for 5-10min to form a base fluid, adding a cross-linking agent in the construction process to form jelly, adding a gel breaker in a wedge shape, closing the well after fracturing, open-jetting, recovering the fracturing flowback fluid, and directly recycling. The treatment method can effectively relieve the pressure of safety and environmental protection brought by large-scale fracturing of the oil field, saves water resources and has remarkable economic and social benefits.
Description
Technical Field
The invention belongs to the field of oil field production increase, and particularly relates to a method for directly recycling fracturing flowback fluid.
Background
Fracturing has been rapidly developed and widely used as a primary means of increasing production and injection in hydrocarbon reservoirs. Fracturing is a stimulation and stimulation measure that uses pressure to fracture a formation and uses proppant to prop it up to reduce the resistance to fluid flow. The purpose of fracturing is to form a crack with flow conductivity in a stratum, the adopted fracturing fluid determines the fracturing effect to a great extent, and meanwhile, certain requirements are placed on the viscosity of the fracturing fluid, so that the fracturing fluid can become a low-viscosity fluid after fracturing and is easy to flowback, and the damage to an oil-gas layer in the stratum is avoided.
The hydraulic fracturing technology is a key technology for low-permeability reservoir reconstruction, and hydraulic fracturing needs to consume a large amount of fresh water and has influence on local water resources, and the influence is particularly serious in water resource-deficient areas. At present, the requirement on domestic environmental protection is obviously improved, along with the deepening of oil field development, a large amount of fracturing flowback fluid exists in each fracturing site of the Changqing oil field, and the innocent treatment cost is high and the efficiency is low. The contradiction between supply and demand of fracturing water is increasingly prominent, so if the fracturing flow-back fluid can be used for preparing the fracturing fluid, the method has great significance for green development of oil fields, cost reduction and efficiency improvement.
The existing method for recycling guanidine gum fracturing flowback fluid directly prepares fracturing fluid by adding bactericide, treating agent, thickening agent, clay stabilizer, cleanup additive and the like, and recycles the fracturing fluid. However, the temperature resistance problem of the newly prepared fracturing fluid is only considered, and the problem that the fracturing flowback fluid is easily influenced by bacteria and stored is not considered; the problem of gel return caused by incomplete gel breaking of the fracturing flow-back fluid; the prepared fracturing fluid has sand carrying performance in the construction process; the problems of repeated use and the influence of the content change components such as ion content, organic matters, inorganic matters, impurities and the like in the water for preparing the liquid on the system exist in the implementation process.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a method for directly recycling the fracturing flow-back fluid, which solves the problem that the fracturing flow-back fluid cannot meet the construction requirements of on-site fracturing after being repeatedly prepared due to the influences of high-valence metal ions, pH value and the like. The fracturing fluid directly recovered from the fracturing flow-back fluid has stable performance, good temperature resistance, obviously improved sand carrying capacity, more obvious treatment capacity and high recycling rate.
The invention is realized by the following technical scheme.
A method for directly recycling fracturing flowback fluid comprises the following steps:
1) after being recovered, the used fracturing flowback fluid is settled by a desanding tank and transferred to a liquid storage tank, and 0.08-1.0% of bactericide is added in the transferring process for centralized treatment and then stored; 2) before using the stored frac flowback fluid, the flocculant and screener 1: 2, sequentially adding 0.04-0.08% of flocculating agent and 0.08-0.16% of shielding agent according to the proportion, adopting cement truck circulation, then adding 0.2-0.3% of pH regulator to adjust the pH to 4-6, and then recycling;
the flocculating agent is one or more of glucose, polyaluminium chloride, white sugar, polyferric sulfate, polyaspartic acid or polyacrylamide;
the shielding agent is one or more of EDTA disodium, EDTA tetrasodium, EDTA, aminotriacetic acid, diethylene triamine pentaacetic acid, sodium chlorate, ammonium citrate or organic polyphosphonic acid;
3) sequentially adding 0.2-0.4% of thickening agent, 0.3-0.5% of cleanup additive and 0.3-0.5% of clay stabilizer according to the mass ratio, and finally adopting discharge circulation to form guanidine gum base fluid;
4) when in fracturing construction, 0.3-0.6% of cross-linking agent in mass ratio is added to form guanidine gel to carry propping agent, and 0.02-0.04% of gel breaker is added at the end of construction; after fracturing, closing the well for 30min, then open-blowing, and preparing fracturing fluid from the fracturing flow-back fluid again to realize direct recycling;
the highest sand-carrying concentration of the recovered fracturing flow-back fluid reaches 750Kg/m3(ii) a The highest mineralization tolerance can reach 90000 mg/L.
Further, the bactericide is one or more of alkyl dimethyl ammonium acetate, potassium sorbate, butylparaben, sodium pentachlorophenate or isothiazolinone.
Further, the thickening agent is hydroxypropyl guar gum, carboxymethyl guar gum, xanthan gum or fenugreek gum.
Further, the cleanup additive is one or two of perfluoroalkyl carboxylic acid, perfluorooctane sulfonate tetraethylammonium amide, perfluoropropyl alkyl sulfonate or perfluoroalkyl ethane sulfonate.
Further, the clay stabilizer is one or two of potassium chloride or polyepichlorohydrin-dimethylamine.
Further, the cross-linking agent is formed by mixing organic boron and inorganic boron according to the proportion of 1 (3-10), wherein the organic boron is triethanolamine borate or ethylene glycol borate; the inorganic boron is borax or sodium borate.
Further, the propping agent is 20-100 meshes of quartz sand or ceramsite.
Further, the gel breaker is one or more of ammonium persulfate, potassium persulfate, biological enzyme, hydrogen peroxide, cellulose glucoside bond specific enzyme, starch glucoside bond specific enzyme or guar gum glucoside bond specific enzyme.
Further, in the step 2), circulating for 5-10min by adopting a cement truck, then adding a pH regulator, and circulating for 5 min; the pH regulator is one or more of citric acid, glycolic acid, tartaric acid, hypochlorous acid, gluconic acid or sodium bicarbonate.
Further, in the step 3), 0.5-4.0m is adopted3And the displacement per minute is circulated for 5-15min to form the guanidine gum base fluid.
The invention has the beneficial effects that:
after simple sand setting treatment, adding a flocculating agent and a shielding agent in sequence according to a certain proportion, adopting cement truck circulation, and adding a pH regulator to adjust the pH value, so that the fracturing flowback fluid can be stored for a longer time; the use concentration of the recycled thickening agent can be reduced, the damage to the stratum is effectively reduced, and the cost is reduced; has more excellent sand carrying performance and can meet the requirement of the sand concentration of 750Kg/m3Construction requirements; the most important characteristics can meet the requirements of different kinds of plantsThe physical cement fracturing flow-back fluid construction requirement is met, and the application range is wider; can realize stable repeated utilization performance for many times, and the repeated utilization times can reach more than 50 times.
The fracturing flow-back fluid adopts a specific bactericide, can be stored for 15-30 days under different temperature conditions after being recovered, can relieve the influence caused by bacterial decomposition, and improves the reuse rate of the fracturing flow-back fluid.
The flocculating agent is added to effectively treat suspended matters, organic matters, mechanical impurities, dirty oil and the like in the fracturing flow-back fluid, so that the influence of the flocculating agent on the system performance of the recompounded fracturing fluid is prevented.
The added shielding agent is used for shielding and oxidation reduction treatment of various influence repeated liquid preparation metal ions in the fracturing flowback fluid, and the fracturing flowback fluid can be used under the condition of higher mineralization degree, and the performance of the fracturing fluid is more stable.
The mutual effect of the flocculating agent and the shielding agent is to prevent the fracturing fluid from being repeatedly crosslinked in the flowback process, so that the viscosity is increased, and the flowback rate is reduced.
The added PH regulator has two main functions, one is a weak acid regulator, and the function of the added PH regulator can enable the thickening agent to better swell in a weak acid environment to generate higher viscosity; one is also used as a chemical inhibitor, which can effectively prevent the metal ions from generating oxidation-reduction reaction.
The added compound cross-linking agent is used in combination, and mainly plays three roles: firstly, the problem of poor stability of cross-linking sand-carrying performance caused by component change of fracturing flow-back fluid can be solved by combining elastic adjustment and use; secondly, the fracturing fluid can be adjusted to a specific environment capable of being crosslinked, so that the crosslinking of the fracturing fluid is better promoted; thirdly, the aim of repeated crosslinking of the fracturing flow-back fluid can be achieved, and the repeated utilization times are improved.
And (3) open flow is carried out 30min after the well is closed, and the main effect is that the fracturing fluid can be better broken, so that fewer flocculating agents and shielding agents can be used in the recycling process, and the cost is reduced.
The treatment method can effectively relieve the pressure of safety and environmental protection brought by large-scale fracturing of the oil field, saves water resources, and has remarkable economic benefit and social benefit.
The highest sand-carrying concentration of the recovered fracturing flow-back fluid reaches 750Kg/m3(ii) a The highest mineralization tolerance can reach 90000 mg/L.
Detailed Description
The present invention is further illustrated by the following examples, which are not to be construed as limiting the invention in any way.
The method for directly recycling the fracturing flow-back fluid comprises the following steps:
1) recovering the used fracturing flow-back fluid, firstly settling the fracturing flow-back fluid by a sand removal tank, transferring the fracturing flow-back fluid to a liquid storage tank, adding 0.08-1.0% of bactericide (alkyl dimethyl ammonium acetate, potassium sorbate, butyl paraben, sodium pentachlorophenate or isothiazolinone) according to the mass ratio in the transferring process, carrying out centralized treatment, and storing;
2) prior to use of the stored frac flowback fluid, the fracturing fluid was treated according to a flocculant (glucose, polyaluminum chloride, white sugar, polyferric sulfate, polyaspartic acid, or polyacrylamide) and a shielding agent (disodium EDTA, tetrasodium EDTA, nitrilotriacetic acid, diethylenetriaminepentaacetic acid, sodium chlorate, ammonium citrate, or organic polyphosphonic acid) 1: 2, adding 0.04-0.08 percent of flocculating agent and 0.08-0.16 percent of shielding agent in sequence; circulating with cement truck for 5-10min, adding 0.2-0.3% pH regulator (citric acid, glycolic acid, tartaric acid, hypochlorous acid, gluconic acid or sodium bicarbonate) to adjust pH to 4-6, and circulating for 5 min;
3) adding 0.2-0.4% of thickening agent (hydroxypropyl guar gum, carboxymethyl guar gum, xanthan gum or fenugreek gum), 0.3-0.5% of discharge assistant (perfluoroalkyl carboxylic acid, perfluorooctanesulfonic acid tetraethyl amine amide, perfluoropropylalkylsulfonate, perfluoroalkyl ethanesulfonate) and 0.3-0.5% of clay stabilizer (potassium chloride, polyepichlorohydrin-dimethylamine) according to the mass ratio in sequence, and finally adopting 0.5-4.0m3The displacement per min is circulated for 5-15min to form base liquid;
4) when in fracturing construction, 0.3-0.5% of cross-linking agent (triethanolamine borate or ethylene glycol boric acid vinegar: borax or sodium borate ═ 1 (3-10)) to form guar jelly to carry proppant (quartz sand, ceramsite), and at the end of construction, 0.02-0.04% of gel breaker (ammonium persulfate, potassium persulfate, biological enzyme, hydrogen peroxide, cellulose glucoside bond specific enzyme, starch glucoside bond specific enzyme or guar glucoside bond specific enzyme) is added; and after fracturing is finished, closing the well for 30min, then open-blowing, and preparing fracturing fluid from the fracturing flow-back fluid again to realize direct recycling.
The settling tank can realize the independent separation of oil, water, propping agent and mechanical impurities according to the density difference, the propping agent and the mechanical impurities at the bottommost layer are isolated independently after settling, and the recovery and the utilization can be realized by adopting manhole treatment; a small amount of crude oil on the upper layer enters a specific space and is recycled by a production unit to enter a flow; the middle-layer fracturing flow-back fluid is transferred to a liquid storage tank by an electric pump for recycling.
The invention is further illustrated by the following specific examples.
Example 1:
the reservoir burial depth of a certain three-series new well (1#) is 1670m, and the formation temperature is 51 ℃. After the first stage of fracturing flow-back fluid is recovered on site, the fracturing flow-back fluid is transferred to a liquid storage tank after sedimentation treatment of a desanding tank, and 0.08 percent of alkyl dimethyl ammonium acetate bactericide is added in the transferring process for concentrated storage for 6 days; before the second stage of fracturing, 0.08 percent of polymeric ferric sulfate and 0.16 percent of EDTA disodium are added before preparing fracturing fluid, a cement truck is adopted for circulation for 5min, and then 0.2 percent of citric acid is added for circulation for 5 min; then 0.3 percent of hydroxypropyl guar gum, 0.5 percent of perfluoroalkyl carboxylic acid cleanup additive and 0.5 percent of potassium chloride are added in sequence according to the designed formula, and finally 0.8m is adopted3And the displacement is circulated for 10min per min to form the guanidine gum base solution. During the fracturing construction, 0.3% of cross-linking agent (triethanolamine borate: borax ═ 1:3) is added to form jelly to carry propping agents (quartz sand and ceramsite), and 0.02% of ammonium persulfate gel breaker is added at the end of the construction. And after fracturing is finished, closing the well for 30min, then open-jetting, and preparing the fracturing fluid from the fracturing flow-back fluid.
Example 2:
the reservoir burial depth of a certain three-stacked new well (2#) is 2050m, the formation temperature is 70 ℃, after the first-stage fracturing flowback fluid is recovered on site, a sand removal tank is settledTransferring to a liquid storage tank, and intensively storing for 10 days in the transferring process according to the addition of 1.0% potassium sorbate fungicide; before the second stage of fracturing, adding 0.05% of glucose and 0.10% of EDTA tetrasodium before preparing a fracturing fluid, circulating for 10min by adopting a cement truck, then adding 0.3% of gluconic acid, and circulating for 5 min; then 0.3 percent of carboxymethyl hydroxypropyl grade guanidine gum, 0.5 percent of perfluorooctanesulfonic acid tetraethyl amine amide cleanup additive and 0.5 percent of polyepichlorohydrin-dimethylamine are added in sequence according to the design formula, and finally 1.0m is adopted3The displacement per minute is circulated for 5min to form base liquid. During the fracturing construction, 0.5% of cross-linking agent (ethylene glycol boric acid vinegar: sodium borate 1:8) is added to form jelly to carry propping agent (quartz sand and ceramsite), and 0.03% of potassium persulfate gel breaker is added at the end of the construction. And after fracturing is finished, closing the well for 30min, then open-jetting, and preparing the fracturing fluid from the fracturing flow-back fluid.
Example 3:
the reservoir burial depth of a certain three-cascade new well (2#) is 1800m, the formation temperature is 64 ℃, after the first-stage fracturing flowback fluid is recovered on site, the sand removal tank is transferred to a liquid storage tank after sedimentation treatment, and 1.0% of butylparaben bactericide is added in the transferring process and is stored for 10 days in a centralized manner; before the second stage of fracturing, adding 0.06% of polychlorinated chlorine and 0.12% of EDTA before preparing fracturing fluid, circulating for 8min by adopting a cement truck, adding 0.2% of sodium bicarbonate, and circulating for 5 min; then 0.2 percent of carboxymethyl guar gum, 0.4 percent of perfluoropropyl alkane sulfonate cleanup additive and 0.3 percent of polyepichlorohydrin-dimethylamine clay stabilizer are added in sequence according to the design formula, and finally 4.0m is adopted3The displacement per min is circulated for 15min to form base liquid. During the fracturing construction, 0.4% of cross-linking agent (ethylene glycol boric acid vinegar: sodium borate is 1:4) is added to form jelly to carry propping agent (quartz sand and ceramsite), and 0.04% of hydrogen peroxide gel breaker is added at the end of the construction. And after fracturing is finished, closing the well for 30min, then open-jetting, and preparing the fracturing fluid from the fracturing flow-back fluid.
Example 4:
the reservoir of a new well (2#) of a certain three-stacked system has the buried depth of 2200m and the formation temperature of 75 ℃, the first-stage fracturing flowback fluid is recovered on site, the fluid is transferred to a fluid reservoir after sedimentation treatment of a sand removal tank, and 0.09 percent sodium pentachlorophenate bactericide is added in the transferring process to be stored for 10 days in a centralized manner; before the second stage of fracturing, preparing fracturingAdding 0.05% of polyaspartic acid before liquid, circulating for 6min by adopting a cement truck, adding 0.10% of diethylenetriaminepentaacetic acid, and adding 0.2% of hypochlorous acid; then sequentially adding 0.3% of guar gum, 0.5% of perfluoroalkyl carboxylic acid cleanup additive and 0.4% of polyepichlorohydrin-dimethylamine clay stabilizer according to the design formula, and finally adopting 0.5m3The displacement per minute is circulated for 10min to form base liquid. During the fracturing construction, 0.3% of cross-linking agent (ethylene glycol boric acid acetate: sodium borate 1:10) is added to form jelly to carry the propping agent, and 0.03% of cellulose glycosidic bond specific enzyme gel breaker is added at the end of the construction. And after fracturing is finished, closing the well for 30min, then open-jetting, and preparing the fracturing fluid from the fracturing flow-back fluid.
Example 5:
the reservoir of a certain three-stacked new well (2#) has the buried depth of 1450m and the formation temperature of 48 ℃, the first-stage fracturing flowback fluid is recovered on site, the sand removal tank is transferred to a liquid storage tank after sedimentation treatment, and 0.08 percent of potassium sorbate plus isothiazolinone bactericide is added in the transfer process for concentrated storage for 10 days; before the second stage of fracturing, adding 0.04% of polymeric ferric sulfate and polyaspartic acid before preparing fracturing fluid, circulating for 6min by adopting a cement truck, then adding 0.08% of aminotriacetic acid, diethylenetriamine pentaacetic acid and ammonium citrate, and then adding 0.2% of tartaric acid and glycolic acid; then 0.4 percent of xanthan gum and fenugreek gum, 0.3 percent of perfluoroalkyl ethanesulfonate as a discharge aid and 0.5 percent of potassium chloride are added in sequence according to the designed formula, and finally 0.5m3The displacement per minute is circulated for 10min to form base liquid. During the fracturing construction, 0.5% of cross-linking agent (triethanolamine borate: borax ═ 1:10) is added to form jelly to carry propping agent (quartz sand and ceramsite), and 0.04% of cellulose glucoside bond specific enzyme + guanidine gum glucoside bond specific enzyme gel breaker is added at the end of the construction. And after fracturing is finished, closing the well for 30min, then open-jetting, and preparing the fracturing fluid from the fracturing flow-back fluid.
The results of the performance tests of the examples and comparative examples are shown in Table 1
TABLE 1 comparison of Properties
As can be seen from Table 1, the fracturing fluid prepared by the method for recycling the fracturing flow-back fluid is more stable in performance, has good temperature resistance, obviously improves the sand carrying capacity, has more obvious treatment capacity, is wider in application range, greatly increases the recycling times, reduces the damage to the stratum while reducing the using concentration of the guanidine gum, and has obvious economic benefit and social benefit.
The present invention is not limited to the above-mentioned embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and modifications to some technical features without creative efforts according to the disclosed technical contents, and these substitutions and modifications are all within the protection scope of the present invention.
Claims (9)
1. A method for directly recycling fracturing flowback fluid is characterized by comprising the following steps:
1) after being recovered, the used fracturing flowback fluid is settled by a desanding tank and transferred to a liquid storage tank, and 0.08-1.0% of bactericide is added in the transferring process for centralized treatment and then stored;
2) before using the stored frac flowback fluid, the flocculant and screener 1: 2, sequentially adding 0.04-0.08% of flocculating agent and 0.08-0.16% of shielding agent according to the proportion, adopting cement truck circulation, then adding 0.2-0.3% of pH regulator to adjust the pH to 4-6, and then recycling;
3) sequentially adding 0.2-0.4% of thickening agent, 0.3-0.5% of cleanup additive and 0.3-0.5% of clay stabilizer according to the mass ratio, and finally adopting discharge circulation to form guanidine gum base fluid;
4) when in fracturing construction, 0.3-0.6% of cross-linking agent in mass ratio is added to form guanidine gel to carry propping agent, and 0.02-0.04% of gel breaker is added at the end of construction; after fracturing, closing the well for 30min, then open-blowing, and preparing fracturing fluid from the fracturing flow-back fluid again to realize direct recycling;
the bactericide is one or more of alkyl dimethyl ammonium acetate, potassium sorbate, butylparaben, sodium pentachlorophenate or isothiazolinone;
the flocculating agent is one or more of glucose, polyaluminium chloride, white sugar, polyferric sulfate, polyaspartic acid or polyacrylamide;
the shielding agent is one or more of EDTA disodium, EDTA tetrasodium, EDTA, aminotriacetic acid, diethylene triamine pentaacetic acid, sodium chlorate, ammonium citrate or organic polyphosphonic acid;
the pH regulator is one or more of citric acid, glycolic acid, tartaric acid, hypochlorous acid, gluconic acid or sodium bicarbonate;
the cross-linking agent is formed by mixing organic boron and inorganic boron according to the proportion of 1 (3-10), wherein the organic boron is triethanolamine borate or ethylene glycol borate; the inorganic boron is borax or sodium borate;
the highest sand-carrying concentration of the recovered fracturing flow-back fluid reaches 750Kg/m3(ii) a The highest mineralization tolerance can reach 90000 mg/L; the temperature resistance is more than 120 ℃; the recycling times are more than 20 times.
2. The method of claim 1, wherein the thickener is hydroxypropyl guar, carboxymethyl guar, xanthan gum, or fenugreek gum.
3. The method for directly recycling the fracturing flow-back fluid according to claim 1, wherein the cleanup additive is one or two of perfluoroalkyl carboxylic acid, perfluoropropyl alkyl sulfonate or perfluoroalkyl ethane sulfonate.
4. The method of claim 1, wherein the clay stabilizer is one or both of potassium chloride and polyepichlorohydrin-dimethylamine.
5. The method for directly recycling the fracturing flow-back fluid according to claim 1, wherein the proppant is 20-100 mesh quartz sand or ceramsite.
6. The method for directly recycling the fracturing flow-back fluid according to claim 1, wherein the gel breaker is one or more of ammonium persulfate, potassium persulfate, biological enzyme or hydrogen peroxide.
7. The method of claim 1, wherein the breaker is one or more of a cellulose glycoside bond-specific enzyme, an amyloglycoside bond-specific enzyme, or a guanaco glycoside bond-specific enzyme.
8. The method for directly recycling the fracturing flow-back fluid according to claim 1, wherein in the step 2), a cement truck is adopted for circulation for 5-10min, and then a pH regulator is added for circulation for 5 min.
9. The method for directly recycling the fracturing flow-back fluid as claimed in claim 1, wherein in the step 3), 0.5-4.0m is adopted3And the displacement per minute is circulated for 5-15min to form the guanidine gum base fluid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711060279.2A CN107858143B (en) | 2017-11-01 | 2017-11-01 | Method for directly recycling fracturing flowback fluid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711060279.2A CN107858143B (en) | 2017-11-01 | 2017-11-01 | Method for directly recycling fracturing flowback fluid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107858143A CN107858143A (en) | 2018-03-30 |
| CN107858143B true CN107858143B (en) | 2020-12-01 |
Family
ID=61696519
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711060279.2A Active CN107858143B (en) | 2017-11-01 | 2017-11-01 | Method for directly recycling fracturing flowback fluid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107858143B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108997995A (en) * | 2018-07-12 | 2018-12-14 | 中国石油集团西部钻探工程有限公司 | The fracturing fluid and preparation method thereof prepared using oilfield sewage |
| CN108865103A (en) * | 2018-07-12 | 2018-11-23 | 中国石油集团西部钻探工程有限公司 | The method of liquid additive and preparation method thereof and extemporaneous preparation fracturing fluid |
| CN109679641B (en) * | 2018-11-14 | 2021-10-29 | 中国石油天然气集团有限公司 | Fracturing fluid prepared from high-salinity salt lake water and preparation method thereof |
| CN113462376A (en) * | 2021-08-16 | 2021-10-01 | 三桶油环保科技(宜兴)有限公司 | Method for preparing fracturing fluid by using polymer type fracturing flowback fluid |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103602330A (en) * | 2013-12-09 | 2014-02-26 | 中国石油大学(华东) | Fiber composite hydraulic fracturing fluid for shale volume fracturing |
| CN104804719A (en) * | 2014-01-26 | 2015-07-29 | 中国石油天然气股份有限公司 | Method for preparing fracturing fluid by using fracturing flow-back fluid |
| CN105064970A (en) * | 2015-08-21 | 2015-11-18 | 陕西海默油田服务有限公司 | Oil and gas well fracturing flow-back fluid treatment method |
| CN105255474A (en) * | 2015-09-02 | 2016-01-20 | 中国石油集团渤海钻探工程有限公司 | Selectively processing method for fracturing flow-back fluid and recycling method |
| CN105255475A (en) * | 2015-09-16 | 2016-01-20 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Recycling method for guanidine gum fracturing flow-back fluid |
| CN105347542A (en) * | 2015-10-29 | 2016-02-24 | 中国石油集团渤海钻探工程有限公司 | Guar gum fracturing flow-back fluid water treatment and reuse technology |
| CN105838346A (en) * | 2016-04-12 | 2016-08-10 | 三原弘迪森精细化工有限公司 | A method of preparing a natural plant gum crosslinked fracturing fluid by utilizing a fracturing and gel breaking return fluid |
| CN106746368A (en) * | 2017-02-20 | 2017-05-31 | 中国石油集团川庆钻探工程有限公司 | A kind of fracturing outlet liquid recycling processing method |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8162048B2 (en) * | 2008-09-09 | 2012-04-24 | Tetra Technologies, Inc. | Method of delivering frac fluid and additives |
| US20110166049A1 (en) * | 2010-01-06 | 2011-07-07 | Haggstrom Johanna A | UV Light Treatment Methods and System |
| CN105565556B (en) * | 2014-10-11 | 2019-01-08 | 中国石油化工股份有限公司 | The fracturing outlet liquid and its application that the processing method of fracturing outlet liquid and processing obtain |
| CN105985762B (en) * | 2015-02-11 | 2019-01-25 | 瑞智石油建井服务（中国）有限公司 | A kind of fracturing fluid and preparation method thereof |
| CN105985765B (en) * | 2015-02-16 | 2018-10-16 | 中国石油天然气股份有限公司 | Fracturing fluid thickener and preparation method thereof and fracturing fluid |
-
2017
- 2017-11-01 CN CN201711060279.2A patent/CN107858143B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103602330A (en) * | 2013-12-09 | 2014-02-26 | 中国石油大学(华东) | Fiber composite hydraulic fracturing fluid for shale volume fracturing |
| CN104804719A (en) * | 2014-01-26 | 2015-07-29 | 中国石油天然气股份有限公司 | Method for preparing fracturing fluid by using fracturing flow-back fluid |
| CN105064970A (en) * | 2015-08-21 | 2015-11-18 | 陕西海默油田服务有限公司 | Oil and gas well fracturing flow-back fluid treatment method |
| CN105255474A (en) * | 2015-09-02 | 2016-01-20 | 中国石油集团渤海钻探工程有限公司 | Selectively processing method for fracturing flow-back fluid and recycling method |
| CN105255475A (en) * | 2015-09-16 | 2016-01-20 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Recycling method for guanidine gum fracturing flow-back fluid |
| CN105347542A (en) * | 2015-10-29 | 2016-02-24 | 中国石油集团渤海钻探工程有限公司 | Guar gum fracturing flow-back fluid water treatment and reuse technology |
| CN105838346A (en) * | 2016-04-12 | 2016-08-10 | 三原弘迪森精细化工有限公司 | A method of preparing a natural plant gum crosslinked fracturing fluid by utilizing a fracturing and gel breaking return fluid |
| CN106746368A (en) * | 2017-02-20 | 2017-05-31 | 中国石油集团川庆钻探工程有限公司 | A kind of fracturing outlet liquid recycling processing method |
Non-Patent Citations (1)
| Title |
|---|
| 压裂返排液重复利用新型杀菌剂研制;林飞 等;《天然气与石油》;20160415;第34卷(第2期);64-67 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107858143A (en) | 2018-03-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107858143B (en) | Method for directly recycling fracturing flowback fluid | |
| Li et al. | A review of crosslinked fracturing fluids prepared with produced water | |
| CN105064970B (en) | A kind of well fracturing returns drain processing method | |
| US11279866B2 (en) | Boosters for breakers containing iron compounds | |
| WO2019153239A1 (en) | Drilling fluid for inhibiting clay surface hydration and preparation method therefor | |
| CN108570317B (en) | Microemulsion for relieving water lock injury of low-permeability reservoir | |
| US11987513B2 (en) | Method for synergistic degradation treatment of polysaccharide-containing polymer wastewater by controllable—OH radical | |
| CN113684012B (en) | Acidizing blocking remover and preparation method thereof | |
| US20130014952A1 (en) | Treatment of hydrocarbon containing reservoirs with electrolyzed water | |
| CN111704263A (en) | Resource utilization method of water-based fracturing flowback fluid | |
| CN112251214A (en) | Stratum degradation acid and application thereof | |
| CN106867498B (en) | Fracturing fluid prepared from acidizing fracturing flow-back fluid | |
| CN114686198B (en) | Low-concentration self-assembled guanidine gum fracturing fluid and preparation method thereof | |
| CN107325806B (en) | Clean steering acid liquor system containing erucyl quaternary ammonium salt surfactant | |
| CN114940895A (en) | Clean high-performance carbon dioxide foam fracturing fluid and preparation method thereof | |
| CN1069912C (en) | Preparation method of oil well fracturing fluids low-temp. glue breaking agent | |
| CA2864203A1 (en) | Hydraulic fracturing method and fluid including in-situ boron-laden produced waters | |
| CN103694979B (en) | A kind of MH acid composition and application thereof | |
| CN101857663B (en) | Method for preparing acid fracturing, temperature-controlled and variable-viscosity polymer and polymer cross-linked body | |
| US10259994B2 (en) | Enhanced subterranean treatment fluids in ionic water or seawater | |
| CN111847705A (en) | Waste polymer drilling fluid treatment and recycling method | |
| CN104445700A (en) | Treatment and reuse method of guanidine gum fracturing wastewater | |
| CN112662385A (en) | Polymer micelle depolymerizing agent for polymer injection well of oil field and preparation method thereof | |
| CN109837546B (en) | Ammonium persulfate corrosion inhibitor used in production oil pipeline of offshore oil field and application thereof | |
| CN111621283A (en) | Thickening agent for high-water-content gas well foam acidizing fracturing and preparation and application thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |