CN116004209A - Composite blocking remover for fracturing and preparation method and application thereof - Google Patents
Composite blocking remover for fracturing and preparation method and application thereof Download PDFInfo
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- CN116004209A CN116004209A CN202310026860.1A CN202310026860A CN116004209A CN 116004209 A CN116004209 A CN 116004209A CN 202310026860 A CN202310026860 A CN 202310026860A CN 116004209 A CN116004209 A CN 116004209A
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- 239000002131 composite material Substances 0.000 title claims abstract description 94
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 230000000903 blocking effect Effects 0.000 title claims description 15
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 111
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims abstract description 26
- UKLNMMHNWFDKNT-UHFFFAOYSA-M sodium chlorite Chemical compound [Na+].[O-]Cl=O UKLNMMHNWFDKNT-UHFFFAOYSA-M 0.000 claims abstract description 15
- 229960002218 sodium chlorite Drugs 0.000 claims abstract description 15
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 31
- 239000000654 additive Substances 0.000 claims description 23
- 230000000996 additive effect Effects 0.000 claims description 23
- 239000007864 aqueous solution Substances 0.000 claims description 20
- -1 alkyl glycoside Chemical class 0.000 claims description 19
- 238000010276 construction Methods 0.000 claims description 19
- 230000007797 corrosion Effects 0.000 claims description 17
- 238000005260 corrosion Methods 0.000 claims description 17
- 239000000243 solution Substances 0.000 claims description 17
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 16
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 16
- 239000003112 inhibitor Substances 0.000 claims description 15
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 claims description 13
- 239000001632 sodium acetate Substances 0.000 claims description 13
- 235000017281 sodium acetate Nutrition 0.000 claims description 13
- 239000004094 surface-active agent Substances 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 12
- CADWTSSKOVRVJC-UHFFFAOYSA-N benzyl(dimethyl)azanium;chloride Chemical compound [Cl-].C[NH+](C)CC1=CC=CC=C1 CADWTSSKOVRVJC-UHFFFAOYSA-N 0.000 claims description 11
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 10
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 claims description 10
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- 229930182470 glycoside Natural products 0.000 claims description 9
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- 238000002156 mixing Methods 0.000 claims description 9
- 239000001509 sodium citrate Substances 0.000 claims description 9
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- 235000005074 zinc chloride Nutrition 0.000 claims description 5
- 239000003002 pH adjusting agent Substances 0.000 claims description 3
- 238000002347 injection Methods 0.000 abstract description 44
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- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 abstract description 22
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- 230000002829 reductive effect Effects 0.000 abstract description 14
- 239000004155 Chlorine dioxide Substances 0.000 abstract description 11
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- 210000004027 cell Anatomy 0.000 abstract description 7
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- 238000011084 recovery Methods 0.000 abstract description 5
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- 239000011593 sulfur Substances 0.000 abstract description 4
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- QIVBCDIJIAJPQS-VIFPVBQESA-N L-tryptophane Chemical compound C1=CC=C2C(C[C@H](N)C(O)=O)=CNC2=C1 QIVBCDIJIAJPQS-VIFPVBQESA-N 0.000 abstract description 3
- OUYCCCASQSFEME-QMMMGPOBSA-N L-tyrosine Chemical compound OC(=O)[C@@H](N)CC1=CC=C(O)C=C1 OUYCCCASQSFEME-QMMMGPOBSA-N 0.000 abstract description 3
- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 abstract description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 abstract description 3
- QIVBCDIJIAJPQS-UHFFFAOYSA-N Tryptophan Natural products C1=CC=C2C(CC(N)C(O)=O)=CNC2=C1 QIVBCDIJIAJPQS-UHFFFAOYSA-N 0.000 abstract description 3
- 235000004279 alanine Nutrition 0.000 abstract description 3
- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 abstract description 3
- 244000005700 microbiome Species 0.000 abstract description 3
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- OUYCCCASQSFEME-UHFFFAOYSA-N tyrosine Natural products OC(=O)C(N)CC1=CC=C(O)C=C1 OUYCCCASQSFEME-UHFFFAOYSA-N 0.000 abstract description 3
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- 241000295146 Gallionellaceae Species 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention belongs to the technical field of petroleum exploitation, and particularly relates to a composite plugging removing agent for fracturing and a preparation method and application thereof. The phosphoric acid and sodium chlorite react to generate chlorine dioxide, which can quickly and efficiently oxidize and decompose high molecular polymers such as guanidine gum, polyacrylamide and the like, so that the molecular chain is changed from long chain to short chain, the viscosity is greatly reduced, and the organic blockage of a reservoir caused by fracturing, polymer injection and the like is relieved. The chlorine dioxide can be adsorbed on the cell walls of microorganisms such as viruses and bacteria, penetrates through the cell walls, enters cells, directly oxidizes substances such as sulfur-containing alanine, tryptophan and tyrosine in the cells, quickly and thoroughly kills various biological thalli such as sulfate reducing bacteria and saprophyte, achieves the purposes of removing blockage, increasing yield and increasing injection, and solves the problems that a filter cake formed by a fracturing fluid in an oil layer causes pollution to the oil layer and a polymer in a tertiary oil recovery injection well causes staged blockage to the oil layer.
Description
Technical Field
The invention belongs to the technical field of petroleum exploitation, and particularly relates to a composite plugging removing agent for fracturing and a preparation method and application thereof.
Background
Hydraulic fracturing is to inject a fracturing fluid into the well at a speed higher than the suction capacity of the reservoir by a high-pressure pump, so that the pressure in the well bore is increased, the reservoir is broken, and a crack symmetrical to the well bore is formed. In order to prevent the cracks from closing after the pump is stopped, solid supports with a certain particle size are carried when the fracturing fluid is injected, the cracks are supported to keep a certain opening degree, the cracks provide channels with high flow conductivity for oil gas, and the yield of an oil well is improved. The fracturing fluid is required to maintain higher viscosity in construction, and is required to be rapidly degraded and thoroughly broken after construction is finished. Because the fracturing gel is not timely and thoroughly broken, especially when the injection pressure of the fracturing fluid is larger than the formation pressure, the fracturing fluid can form a filter cake on the surface of the crack, so that the flow conductivity of the crack can be reduced, and the oil recovery is further affected.
Disclosure of Invention
In view of the above, the invention aims to provide a composite plugging removing agent for fracturing, and a preparation method and application thereof.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a composite plugging removing agent for fracturing, which comprises a main agent and an additive;
the main agent comprises the following components in parts by mass:
the additive comprises the following components in parts by mass:
6-30 parts of phosphoric acid,
4-30 parts of a surfactant,
and 0.5-5 parts of a second corrosion inhibitor.
Preferably, the alkaline pH adjuster comprises sodium carbonate and/or sodium acetate.
Preferably, the first corrosion inhibitor comprises sodium tripolyphosphate.
Preferably, the anti-swelling agent comprises ammonium chloride and/or potassium chloride.
Preferably, the surfactant comprises one or more of sodium citrate, alkyl glycoside, alcohol ether carboxylate, imidazoline, sodium acetate and benzalkonium chloride.
Preferably, the second corrosion inhibitor comprises zinc chloride.
Preferably, the surfactant comprises the following components in parts by mass:
the invention also provides a preparation method of the composite plugging removing agent for fracturing, which comprises the following steps:
and mixing the main agent and the additive to obtain the composite plugging removing agent for fracturing.
The invention also provides an application of the composite plugging removal agent for fracturing in oilfield plugging removal and/or fracturing construction.
Preferably, the application mode is that the main agent in the composite plugging removing agent for fracturing is dissolved in water to obtain a main agent solution; then adding the additive into the main agent solution to obtain a composite plugging removing agent aqueous solution for fracturing; then the composite blocking remover aqueous solution for fracturing is applied to oilfield blocking removal and/or fracturing construction; the mass percentage of sodium chlorite in the water solution of the composite plugging removing agent for fracturing is more than or equal to 0.3 percent.
The invention provides a composite plugging removing agent for fracturing, which comprises a main agent and an additive; the main agent comprises the following components in parts by mass: 10 to 35 parts of sodium chlorite, 1.5 to 5 parts of alkaline pH value regulator, 1.5 to 5 parts of first corrosion inhibitor and 10 to 60 parts of anti-swelling agent; the additive comprises the following components in parts by mass: 6-30 parts of phosphoric acid, 4-30 parts of surfactant and 0.5-5 parts of second corrosion inhibitor. The phosphoric acid and sodium chlorite react to generate chlorine dioxide, which can quickly and efficiently oxidize and decompose high molecular polymers such as guanidine gum, polyacrylamide and the like, so that the molecular chain is changed from long chain to short chain, the viscosity is greatly reduced, and the organic blockage of a reservoir caused by fracturing, polymer injection and the like is relieved. The chlorine dioxide can be adsorbed on the cell walls of microorganisms such as viruses and bacteria, penetrates through the cell walls, enters cells, directly oxidizes substances such as sulfur-containing alanine, tryptophan and tyrosine in the cells, quickly and thoroughly kills various biological thalli such as sulfate reducing bacteria and saprophyte, achieves the purposes of removing blockage, increasing yield and increasing injection, and solves the problems that a filter cake formed by a fracturing fluid in an oil layer causes pollution to the oil layer and a polymer in a tertiary oil recovery injection well causes staged blockage to the oil layer.
Drawings
FIG. 1 is a graph of the degradation of the gel of the fracturing fluid obtained by using the composite plugging removing agent for fracturing of the embodiment 1 of the invention at different temperatures;
FIG. 2 is a graph of the degradation residues of the gel of the fracturing fluid obtained by using the composite plugging removing agent for fracturing of the embodiment 1 of the invention at different temperatures;
FIG. 3 is a scale pattern diagram used in the polymer scale degradation experiment of the composite plugging removing agent for fracturing in the invention.
Detailed Description
The invention provides a composite plugging removing agent for fracturing, which comprises a main agent and an additive;
the main agent comprises the following components in parts by mass:
the additive comprises the following components in parts by mass:
6-30 parts of phosphoric acid,
4-30 parts of a surfactant,
and 0.5-5 parts of a second corrosion inhibitor.
The present invention is not limited to the specific source of the raw materials, and may be commercially available products known to those skilled in the art, unless otherwise specified.
The composite plugging removing agent for fracturing provided by the invention comprises a main agent.
In the invention, the main agent comprises 10-35 parts by weight of sodium chlorite, preferably 15-30 parts by weight.
The main agent comprises 1.5 to 5 parts, more preferably 2 to 4 parts, of an alkaline pH regulator based on 1 part by mass of sodium chlorite in the main agent. In the present invention, the alkaline pH adjuster preferably includes sodium carbonate and/or sodium acetate, more preferably sodium carbonate. When the alkaline pH value regulator is sodium carbonate and sodium acetate, the proportion of the sodium carbonate and the sodium acetate is not particularly limited, and the alkaline pH value regulator can be prepared at random.
The invention adopts the alkaline pH value regulator to regulate the pH value of the composite plugging removal agent for fracturing, thereby avoiding the reaction of the composite plugging removal agent for fracturing and other agents in fracturing fluid.
The main agent comprises 1.5 to 5 parts by mass, more preferably 2 to 4 parts by mass of the first corrosion inhibitor based on 1 part by mass of sodium chlorite in the main agent. In the present invention, the first corrosion inhibitor preferably comprises sodium tripolyphosphate.
The corrosion inhibitor can play a role in inhibiting corrosion of steel by an electrochemical principle.
The main agent comprises 10 to 60 parts by weight, more preferably 20 to 60 parts by weight of an anti-swelling agent based on 1 part by weight of sodium chlorite in the main agent. In the present invention, the anti-swelling agent preferably includes ammonium chloride and/or potassium chloride, more preferably ammonium chloride. When the anti-swelling agent is ammonium chloride and potassium chloride, the proportion of the ammonium chloride and the potassium chloride is not particularly limited, and the anti-swelling agent can be prepared at random.
The anti-swelling agent has strong capability of preventing hydration and swelling of soil, and can well improve rheological property of the composite blocking remover for fracturing, reduce dynamic shear force and reduce viscosity.
The composite plugging removing agent for fracturing provided by the invention comprises an additive.
Based on 1 part by weight of sodium chlorite in the main agent, the additive comprises 6-30 parts by weight of phosphoric acid, preferably 10-20 parts by weight.
In the invention, phosphoric acid and sodium chlorite react to generate chlorine dioxide, and the reaction equation is as follows: 4H (4H) 3 PO 4 +5NaClO 2 →4ClO 2 +2H 2 O+NaCl+4NaH 2 PO 4 . The chlorine dioxide reacts with the polymer or the organic matters such as guanidine gum, so that the molecular chain is changed from long chain to short chain, and the viscosity is greatly reduced. Chlorine dioxide can be adsorbed on the cell walls of microorganisms such as viruses and bacteria, penetrates through the cell walls, enters the cells, and directly oxidizes substances such as sulfur-containing alanine, tryptophan, tyrosine and the like in the cells, thereby eliminating the viruses and the bacteria. In addition, the phosphoric acid contains third-order hydrogen ions, so that corrosion can be reduced, and the effect of slowly releasing chlorine dioxide is achieved.
The composite plugging removing agent for fracturing provided by the invention can decompose amino acid of cell protein, so that phthalein bond (namely amino acid chain) is broken, thereby killing Sulfate Reducing Bacteria (SRB), saprophyte (TGB), iron bacteria (TB) and algae in stratum water and a water injection system, relieving metabolism of bacteria, and further relieving harm of bacteria blocking an oil layer. The invention can also remove the pollution of stratum inorganic salt through acid liquor, thereby achieving the purpose of composite blocking removal.
The additive comprises 4 to 30 parts by mass, more preferably 5 to 20 parts by mass of a surfactant based on 1 part by mass of phosphoric acid in the additive. In the present invention, the surfactant includes one or more of sodium citrate, alkyl glycoside, alcohol ether carboxylate, imidazoline, sodium acetate and benzalkonium chloride, more preferably sodium citrate, alkyl glycoside, alcohol ether carboxylate, imidazoline, sodium acetate and benzalkonium chloride.
In the invention, the surfactant plays roles of complexation, drainage assistance and sterilization.
When the surfactant is sodium citrate, alkyl glycoside, alcohol ether carboxylate, imidazoline, sodium acetate and benzalkonium chloride, the surfactant comprises the following components in parts by mass:
1 to 6 parts of sodium citrate, preferably 2 to 3 parts,
0.5 to 4 parts, preferably 0.5 to 2 parts, of alkyl glycoside,
alcohol ether carboxylate 0.5-5 weight portions, preferably 0.5-1 weight portions,
0.7 to 4 parts, preferably 1 to 3 parts, of imidazoline,
1 to 5 parts of sodium acetate, preferably 2 to 4 parts,
0.6 to 6 parts, preferably 1 to 5 parts, of benzalkonium chloride.
In the invention, the sodium citrate can generate citric acid to play roles in stabilizing and complexing iron ions.
In the invention, the alkyl glycoside has excellent compatibility, stability and surface activity, can be completely biodegraded, does not form metabolites which are difficult to biodegrade, thereby avoiding causing new pollution to the environment, has stronger spectrum antibacterial activity, can reduce water activity, changes the action of shale pore fluid flowing state, can be used as an inhibitor, can play roles of lubricating, inhibiting and protecting a reservoir by an anti-pollution agent when being added into drilling fluid, can achieve the optimal filtration reducing effect when being interacted with other water-soluble polymers, widens the temperature limit range of the natural polymer drilling fluid, and improves the crude oil recovery ratio.
The imidazoline of the invention can play roles of sulfur resistance and oxidation resistance.
In the invention, benzalkonium chloride belongs to a cationic surfactant, belongs to a non-oxidizing bactericide, has broad-spectrum and high-efficiency sterilization and algae removal capability, can effectively control bacterial algae propagation and slime growth in water, has good slime stripping effect and certain dispersion and permeation effects, and can play roles in degreasing, deodorizing and corrosion inhibition.
The additive comprises 0.5 to 5 parts by mass, more preferably 0.5 to 2 parts by mass of the second corrosion inhibitor based on 1 part by mass of phosphoric acid in the additive. In the present invention, the second corrosion inhibitor preferably comprises zinc chloride.
The invention also provides a preparation method of the composite plugging removing agent for fracturing, which comprises the following steps:
and mixing the main agent and the additive to obtain the composite plugging removing agent for fracturing.
The invention is not particularly limited in the mixing process, and the materials can be uniformly mixed according to actual conditions.
The invention also provides an application of the composite plugging removal agent for fracturing in oilfield plugging removal and/or fracturing construction.
In the invention, the oilfield unblocking preferably comprises oil well unblocking, water well unblocking or polymer injection well unblocking, and more preferably oil well unblocking; the fracturing construction preferably comprises oil well fracturing construction or water well fracturing construction.
In the invention, the application mode is preferably to dissolve the main agent in the composite plugging removing agent for fracturing in water to obtain the main agent solutionA liquid; then adding the additive into the main agent solution to obtain a composite plugging removing agent aqueous solution for fracturing; then the composite plugging removing agent aqueous solution for fracturing is applied to oilfield plugging removing and/or fracturing construction, and more preferably, the main agent in the composite plugging removing agent for fracturing is dissolved in water to obtain a main agent solution; the main agent solution is connected with a fracturing sand mixing vehicle through a pipeline, then the additive is connected with the fracturing sand mixing vehicle through a pipeline, and 1m of the additive is injected at the beginning of construction 3 And injecting the main agent solution and the corresponding additive, mixing the two liquids in a sand mixing groove of the fracturing sand mixing vehicle, and injecting the mixture into the bottom of the oil field well.
Based on 1 part by weight of sodium chlorite in the main agent, the water solution of the composite plugging removal agent for fracturing provided by the invention preferably comprises 1000 parts by weight of water.
In the invention, the mass percentage of sodium chlorite in the water solution of the composite plugging removing agent for fracturing is preferably more than or equal to 0.3 percent, more preferably 0.3 to 0.4 percent, the mass percentage of chlorine dioxide is preferably 200 to 6000ppm, more preferably 500 to 1000ppm, and the pH value is preferably 4 to 7, more preferably 4.5 to 6.
In the invention, the dosage of the composite plugging removal liquid for fracturing is preferably 20-200 m in the oilfield plugging removal process 3 Well, more preferably 50 to 200m 3 Well; in the fracturing construction process, the dosage of the composite plugging removal liquid for fracturing is preferably 20-200 m 3 Well, more preferably 50 to 100m 3 Well.
The composite plugging remover aqueous solution for fracturing needs to be prepared at present.
The technical solutions of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention, but they should not be construed as limiting the scope of the present invention.
Example 1
At 1m 3 To the water was added 0.9kg sodium chlorite, 0.15kg sodium carbonate, 0.15kg sodium tripolyphosphate, 2.4kg ammonium chloride, 0.66kg phosphoric acid, 0.12kg sodium citrate, 0.12kg sodium acetate, 0.048kg zinc chloride, 0.06g imidazoline, 0.048kg alkyl glycoside (APG 0810), 0.036kg alcohol ether carboxylate(AEC-9H) and 0.06kg benzalkonium chloride (1227) were mixed to give an aqueous solution of the composite plugging remover for fracturing, wherein the initial content of chlorine dioxide was 800ppm and the pH was 5.
Example 2
At 1m 3 1.05kg of sodium chlorite, 0.175kg of sodium carbonate, 0.175kg of sodium tripolyphosphate, 2.8kg of ammonium chloride, 0.77kg of phosphoric acid, 0.14kg of sodium citrate, 0.14kg of sodium acetate, 0.056kg of zinc chloride, 0.07kg of imidazoline, 0.056kg of alkyl glycoside (APG 0810), 0.042kg of alcohol ether carboxylate (AEC-9H) and 0.07kg of benzalkonium chloride (1227) are added to water, and the mixture is mixed to obtain a composite plugging remover aqueous solution for fracturing, wherein the initial content of chlorine dioxide is 1000ppm, and the pH value is 4.7.
Performance testing
(1) Influence of composite blocking remover for fracturing on fracturing fluid gel
100mL of prepared fracturing fluid gel is taken, 5mL of the prepared composite plugging removal agent aqueous solution for fracturing of example 1 is added, the gel change state is observed, and the result is shown in Table 1.
TABLE 1 degradation of fracturing fluid gels at different times
As can be seen from table 1: the composite blocking remover for fracturing is added to quickly degrade gel into aqueous solution; the gel is rapidly degraded after the composite plugging removing agent for fracturing is added at 60 ℃ and is degraded into an aqueous solution after 2 hours; after the composite plugging removing agent for fracturing is added at 90 ℃, the gel is slightly diluted, but still can be hung, the gel exists after 1h, and the gel is degraded into an aqueous solution state after 2h, which indicates that the composite plugging removing agent for fracturing can rapidly degrade the gel. The aqueous solution after the gel degradation is in a turbid state, as shown in fig. 1, wherein A is 45 ℃ fracturing fluid gel degradation liquid, B is 60 ℃ fracturing fluid gel degradation liquid, C is 90 ℃ fracturing fluid gel degradation liquid, and the viscosity is measured by a capillary viscometer.
(2) Influence of composite blocking remover for fracturing on content of gel residues of fracturing fluid
100mL of the prepared fracturing fluid gel is taken, 5mL of the prepared composite plugging removal agent aqueous solution for fracturing prepared in the embodiment 1 is added, a residue experiment is carried out after gel breaking, the residual residue is shown in figure 2, wherein A is residue at 45 ℃, B is residue at 60 ℃, C is residue at 90 ℃, and the data pair of the fracturing fluid residue after conventional gel breaking is shown in a table 2.
TABLE 2 residue content
As can be seen from table 2, the residue of the composite plugging remover for fracturing provided by the invention is less than that of normal fracturing fluid at different temperatures. The addition of the composite plugging remover for fracturing provided by the invention can reduce the residue of fracturing fluid.
(3) Polymer scale sample degradation experiment of blocking remover
10mL of the composite plugging removal agent aqueous solution for fracturing prepared in the example 1 is taken, polymer scale samples (as shown in figure 3, scale sample 1 is flaky pipe rod scale and scale sample 2 is granular stratum scale) of different oil recovery two factories are put into the water solution, and scale dissolution experiments are carried out at different experimental temperatures, and the results are shown in table 3.
TABLE 3 dissolution of Polymer Scale with composite plugging-removing agent for fracturing
As shown in Table 3, the mass change of the composite plugging removing agent for fracturing before and after the addition of the composite plugging removing agent for fracturing is small, the average value of the dissolution percentages of the composite plugging removing agent for fracturing after the addition of the composite plugging removing agent for fracturing of the scale sample 1 is 64.3%, and the composite plugging removing agent for fracturing provided by the invention can have an erosion effect on stratum scales with large organic matter content, and has little influence on inorganic pipe rod scales such as calcium, magnesium and the like.
(4) Filter cake experiment of plugging removing agent dissolved fracturing fluid
10mL of the composite plugging removal agent aqueous solution for fracturing prepared in example 1 was mixed with 2 filter cakes, and a filter cake dissolution test was performed at 45℃and 90℃to obtain the results shown in Table 4.
TABLE 4 dissolution of cake
As can be seen from Table 4, the composite plugging removing agent for 45 ℃ fracturing can completely dissolve the fracturing fluid filter cake for 6 hours, and the composite plugging removing agent for 90 ℃ fracturing can completely dissolve the fracturing fluid filter cake for 4 hours, which shows that the filter cake can completely dissolve at the experimental temperature for 4-6 hours.
(5) Application condition of Daqing oil extraction plant
4 oil wells were constructed in a polymer flooding in 2015 of an oil production factory, and the composite plugging remover aqueous solution for fracturing of example 2 was injected through a fracturing truck, and the specific results are shown in Table 5.
TABLE 5 variation of oil production before and after injection of composite plugging remover for fracturing
As shown in Table 5, the average daily oil increment of single well is 5.5t, daily liquid increment is 66.4t, water content is reduced by 1.6 percent, and sinking degree is increased by 255m, so that the effect is obvious. The daily oil increase is higher than the level of the whole area before and after the measure, the average daily oil increase of a single well is 4.8t compared with the fracturing well of the same block, and the daily oil increase of 0.7t is 0.5 t when the HRS acidizing fracturing is applied; the fluid increasing amplitude is higher than the level of the whole area, the average fluid increasing amplitude is 103.4% compared with the fracturing wells of the same area, the fluid increasing amplitude of the test well is 125.5%, and the fluid increasing amplitude is increased by 22.1% points; the effective period is long, the accumulated oil is increased more, compared with the accumulated oil in the same block fracturing well for 416t in one year, and the accumulated oil in the test well is increased for 715t and 299t more. From the above, the composite plugging removing agent for fracturing plays a good role in oil layer transformation and fracturing effect extension.
Three wells are selected from a class of oil reservoirs in 2014 in 6-11 months, and a new fracturing and injection increasing process experiment of the composite plugging agent for fracturing is carried out on a south 8-D3-P21 well, a south 8-1-P22 well and a south 8-butyl 4-P25 well.
The application condition analysis of the composite plugging removing agent composite plugging removing technology for fracturing in other oil extraction plants is carried out, part of construction procedures are optimized and improved, the pre-construction soaking treatment procedures are increased on the basis of keeping the original procedures, pollutants in a shaft, a blasthole and a near-wellbore zone can be treated, and the measure effect is improved: (1) Before the fracturing string is lowered, deepening the original well string to below the perforation interval; (2) The composite plugging removing agent for fracturing of the embodiment 2 is beaten into a shaft by using a ground cement pump truck, so that the plugging removing agent solution can completely cover a perforation well section; (3) The soaking time was prolonged to 20 hours, and after the reaction was completed, the well was washed to clear the contaminants out of the well bore, and the results are shown in tables 6 and 7, respectively.
TABLE 6 south 8-Ding 3-P21 fracturing effect statistics table (construction 6 months 2014)
As is clear from Table 6, the pressure of the composite plugging removing agent for fracturing is reduced by 3.0MPa in the early days after the injection of the composite plugging removing agent for fracturing in the 5 th month of 2015 th month of 8-D3-P21 well, and the daily increase of the injection is 26m 3 And/d. The effective period reaches 291 days.
TABLE 7 statistical Table of effects after measures of south 8-1-P22 and south 8-but 4-P25 (construction 11 months in 2014)
As is clear from Table 7, the average daily pressure drop after 5 months of 2015 and 8-1-P22 well measurement is 2.0MPa, and the daily increase is 32m 3 After the measures of/d, south 8-butyl 4-P25, the average daily pressure is reduced by 2.7MPa, and daily increase is 25m 3 And/d, the effective period is up to 180 days, and the effective period is continuously effective.
Therefore, the composite plugging removing agent for fracturing provided by the invention can achieve the purposes of plugging removing, injection increasing and yield increasing from the aspect of the field experimental fracturing effect.
(7) The composite plugging removing agent aqueous solution for fracturing of example 2 is injected into a 5-port injection well constructed in a polymer flooding manner in 2017 of an oil extraction six-factory through a fracturing truck, and the specific effects are shown in table 8.
TABLE 8 variation of oil production before and after injection of composite plugging remover for fracturing
As can be seen from Table 8, the average single well injection pressure is reduced by 9.2MPa and the injection is increased by 12m by comparing the prior and subsequent measures of the composite plugging removal agent for injection fracturing 3 Stage validity period 103d, accumulated augmented injection 1248m 3 . Compared with the first fracturing effect, the initial injection pressure is reduced by 1.8MPa, and the injection is increased by 2m 3 And/d, prolonging the period of validity of the stage by 3d, and accumulating multiple augmented injections of 486m 3 . The composite plugging agent for fracturing and the fracturing combined construction mode are adopted, so that the plugging agent can be effectively pushed to the deep part of an oil layer, and the problem of small plugging radius in the conventional plugging removal process is solved. From the lateral comparison, compared with a conventional fracturing well in a first area of North east, the single well injection pressure is reduced by 1.1MPa, and the injection is increased by 2m 3 And/d. From the aspect of longitudinal comparison, compared with the first fracturing of the well, the single well injection pressure is reduced by 1.8MPa, and the injection is increased by 2m 3 And/d, prolonging the period of validity of the stage by 3d, and accumulating multiple augmented injections of 486m 3 . The on-site construction of 5 wells is high in stage effective rate, and the single well is expected to be prolonged by more than 60 days.
From the above, the composite blocking removal and fracturing combined process technology of the injection well has a certain effect on improving the fracturing measure effect of the injection well and prolonging the effective period.
(8) Test well current effects
The composite plugging removing agent aqueous solution for fracturing of the example 2 is injected into the composite plugging removing test well (8 ports in total) for eastern fracturing in the twelve apricot areas, and the specific effects are shown in Table 9.
Table 9 table of the results of the composite plug removal test for the eastern fracturing of the twelve apricot areas
As is clear from Table 9, the pressure after injection of the composite plugging removing agent for fracturing was 11.4MPa, which is 1.4MPa lower than that before injection. At present, the injection pressure is 12.2MPa, and daily injection is 30m 3 . The pressure is increased by 0.8MPa compared with the pressure after injection, and the daily injection is increased by 7m 3 。
(9) Polymer flooding and water flooding water injection well process parameter analysis
The water solution of the composite plugging remover for fracturing of the embodiment 2 is injected into a polymer flooding and water flooding water injection well, and the specific effects are shown in table 10.
Table 10 table 16, 17 year polymer flooding, water flooding water injection well fracturing effect table
As can be seen from Table 10, the average sandstone of the polymer flooding injection well is 10.2m, and the effective sandstone is 7.4m. The average sandstone of the water flooding injection well is 9.5m, and the effective diameter is 2.7m. The average sandstone of the test well of the composite blocking remover is 10.2m, and the effective rate is 7.8m. And compared with the water flooding stratum condition, the polymer flooding sandstone has larger effective thickness. Average 2 fracturing intervals of polymer flooding injection well and sand adding amount of 34m 3 And 3 cracks are formed. The average number of fracturing intervals of the water drive injection well is 4, and the sand adding amount is 36m 3 5 cracks are fractured, and the polymer flooding scale is larger than that of a water flooding injection well. And through analysis of production conditions before and after the comparison measure, the pressure of the water flooding well is reduced by 2.7MPa after fracturing, and the pressure of the polymer flooding well is reduced by 1.7MPa.
Although the foregoing embodiments have been described in some, but not all, embodiments of the invention, according to which one can obtain other embodiments without inventiveness, these embodiments are all within the scope of the invention.
Claims (10)
1. The composite plugging removing agent for fracturing is characterized by comprising a main agent and an additive;
the main agent comprises the following components in parts by mass:
the additive comprises the following components in parts by mass:
6-30 parts of phosphoric acid,
4-30 parts of a surfactant,
and 0.5-5 parts of a second corrosion inhibitor.
2. The composite plugging remover for fracturing according to claim 1, wherein the alkaline pH adjuster comprises sodium carbonate and/or sodium acetate.
3. The composite plugging remover for fracturing according to claim 1, wherein the first corrosion inhibitor comprises sodium tripolyphosphate.
4. The composite plugging remover for fracturing according to claim 1, wherein the anti-swelling agent comprises ammonium chloride and/or potassium chloride.
5. The composite plugging remover for fracturing according to claim 1, wherein the surfactant comprises one or more of sodium citrate, alkyl glycoside, alcohol ether carboxylate, imidazoline, sodium acetate and benzalkonium chloride.
6. The composite plugging remover for fracturing according to claim 1, wherein the second corrosion inhibitor comprises zinc chloride.
7. The composite plugging removing agent for fracturing according to claim 1, wherein the surfactant comprises the following components in parts by mass:
8. the method for preparing the composite plugging removing agent for fracturing according to any one of claims 1 to 7, which is characterized by comprising the following steps:
and mixing the main agent and the additive to obtain the composite plugging removing agent for fracturing.
9. The application of the composite plugging removing agent for fracturing prepared by the preparation method of any one of claims 1 to 7 or the preparation method of claim 8 in oilfield plugging removing and/or fracturing construction.
10. The use according to claim 9, wherein the method of use is to dissolve the main agent in the composite plugging removal agent for fracturing in water to obtain a main agent solution; then adding the additive into the main agent solution to obtain a composite plugging removing agent aqueous solution for fracturing; then the composite blocking remover aqueous solution for fracturing is applied to oilfield blocking removal and/or fracturing construction; the mass percentage of sodium chlorite in the water solution of the composite plugging removing agent for fracturing is more than or equal to 0.3 percent.
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