CN115873587A - Composite chemical anti-backflow additive and method for preventing backflow of propping agent - Google Patents
Composite chemical anti-backflow additive and method for preventing backflow of propping agent Download PDFInfo
- Publication number
- CN115873587A CN115873587A CN202211439857.4A CN202211439857A CN115873587A CN 115873587 A CN115873587 A CN 115873587A CN 202211439857 A CN202211439857 A CN 202211439857A CN 115873587 A CN115873587 A CN 115873587A
- Authority
- CN
- China
- Prior art keywords
- epoxy resin
- backflow
- water
- curing agent
- weight
- 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.)
- Granted
Links
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 86
- 239000000126 substance Substances 0.000 title claims abstract description 47
- 239000000654 additive Substances 0.000 title claims abstract description 24
- 239000002131 composite material Substances 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000000996 additive effect Effects 0.000 title claims abstract description 21
- 239000003822 epoxy resin Substances 0.000 claims abstract description 104
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 104
- 239000000835 fiber Substances 0.000 claims abstract description 88
- 239000000839 emulsion Substances 0.000 claims abstract description 59
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 230000002265 prevention Effects 0.000 claims abstract description 11
- 150000001875 compounds Chemical class 0.000 claims abstract description 10
- 239000000203 mixture Substances 0.000 claims description 38
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 22
- 239000004846 water-soluble epoxy resin Substances 0.000 claims description 13
- -1 glycidyl ester Chemical class 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 9
- 229920000747 poly(lactic acid) Polymers 0.000 claims description 9
- 239000004626 polylactic acid Substances 0.000 claims description 9
- GYZLOYUZLJXAJU-UHFFFAOYSA-N diglycidyl ether Chemical compound C1OC1COCC1CO1 GYZLOYUZLJXAJU-UHFFFAOYSA-N 0.000 claims description 8
- 229920000768 polyamine Polymers 0.000 claims description 7
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 claims description 6
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 5
- 125000003700 epoxy group Chemical group 0.000 claims description 4
- 239000004845 glycidylamine epoxy resin Substances 0.000 claims description 4
- 229920006122 polyamide resin Polymers 0.000 claims description 4
- 150000004982 aromatic amines Chemical class 0.000 claims description 3
- 229920001577 copolymer Polymers 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 230000000151 anti-reflux effect Effects 0.000 claims description 2
- 239000004593 Epoxy Substances 0.000 abstract description 18
- 239000012530 fluid Substances 0.000 abstract description 14
- 238000005516 engineering process Methods 0.000 abstract description 13
- 230000009286 beneficial effect Effects 0.000 abstract description 9
- 230000008901 benefit Effects 0.000 abstract description 7
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- 230000015572 biosynthetic process Effects 0.000 abstract description 4
- 238000004132 cross linking Methods 0.000 abstract description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 42
- 239000004576 sand Substances 0.000 description 39
- 238000003756 stirring Methods 0.000 description 22
- 239000007788 liquid Substances 0.000 description 12
- 238000005303 weighing Methods 0.000 description 10
- 238000011160 research Methods 0.000 description 9
- 238000007596 consolidation process Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000004743 Polypropylene Substances 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 4
- 238000006731 degradation reaction Methods 0.000 description 4
- 238000009472 formulation Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000005457 optimization Methods 0.000 description 4
- 229920001155 polypropylene Polymers 0.000 description 4
- 239000006004 Quartz sand Substances 0.000 description 3
- YQGOJNYOYNNSMM-UHFFFAOYSA-N eosin Chemical compound [Na+].OC(=O)C1=CC=CC=C1C1=C2C=C(Br)C(=O)C(Br)=C2OC2=C(Br)C(O)=C(Br)C=C21 YQGOJNYOYNNSMM-UHFFFAOYSA-N 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 229920002907 Guar gum Polymers 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000012776 electronic material Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 229960002154 guar gum Drugs 0.000 description 2
- 235000010417 guar gum Nutrition 0.000 description 2
- 239000000665 guar gum Substances 0.000 description 2
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 2
- 238000009533 lab test Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920002994 synthetic fiber Polymers 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 229920000954 Polyglycolide Polymers 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000010977 jade Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000010534 mechanism of action Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000005325 percolation Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920001610 polycaprolactone Polymers 0.000 description 1
- 239000004632 polycaprolactone Substances 0.000 description 1
- 239000004633 polyglycolic acid Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- PAPBSGBWRJIAAV-UHFFFAOYSA-N ε-Caprolactone Chemical compound O=C1CCCCCO1 PAPBSGBWRJIAAV-UHFFFAOYSA-N 0.000 description 1
Images
Abstract
The invention discloses a compound chemical anti-backflow additive and a method for preventing a propping agent from backflow, wherein the compound chemical anti-backflow additive comprises water-based epoxy resin emulsion and degradable fibers in a mass ratio of (0.1-3) to (0.05-0.5). The composite chemical backflow preventing technology of the present invention is that epoxy emulsion and degradable fiber are injected into stratum together with proppant in certain proportion and the well is closed for curing for 4-15 hr. After entering the stratum along with the sand-carrying fluid, the water-based epoxy resin emulsion can be adsorbed on the surfaces of the propping agent and the degradable fibers. The waterborne epoxy resin emulsion contains epoxy resin and a curing agent, and the crosslinking curing reaction is carried out on the surfaces of the propping agent and the degradable fiber, so that the propping agent and the degradable fiber are glued together to achieve the aim of backflow prevention. The backflow prevention technology can reduce the flowback of the propping agent, is beneficial to the stability of formation cracks, reduces the damage to the flow conductivity, prolongs the service life of equipment and is beneficial to improving the comprehensive economic benefit of an oil field.
Description
Technical Field
The invention belongs to the technical field of oilfield fracturing modification, and particularly relates to a composite chemical backflow-preventing additive and a method for preventing a propping agent from flowing back.
Background
The fracturing sand control technology is a composite sand control technology which is rapidly developed in the nineties. The method is characterized in that hydraulic fracturing and gravel packing are carried out on a high-permeability oil (gas) layer with loose strand knots, and the advantages of the hydraulic fracturing and gravel packing are organically combined, which is the most important development of the sand control process in recent years. Therefore, the sand control grade of the injection and production well of the low-permeability gas reservoir gas storage reservoir is improved to a sand consolidation layer, namely, sand is not produced in the injection and production well under the stratum condition, and the conventional chemical and mechanical sand consolidation technology cannot meet the construction requirements.
In consideration of the sand consolidation technical requirements of injection and production wells of the low-permeability gas reservoir, according to the technical principle of a fiber network, the sand consolidation effect research of the elm forest low-permeability gas reservoir under high gas volume is developed by utilizing the characteristics that bundle-shaped monofilament polypropylene fibers have good deformability, strong bond strength, good hydrophilicity, high strength, large elastic modulus, good dispersibility, no agglomeration and good stability in a non-oxidation environment. For the fiber network sand consolidation technology, a great deal of research work has been carried out by the scholars. The Zhuhong wave and the like think that the incorporation of the polypropylene fiber can improve the compressive strength, the residual strength and the toughness of the concrete and effectively inhibit the generation and the development of concrete cracks; according to the Shenfeng and the like, when the volume fraction of the fibers is 1.25%, the dynamic compression strength and the ultimate toughness of the concrete are highest, and the concrete has better impact resistance. At present, the technology is widely applied to engineering construction of highways, concrete, bridges, airports and the like, and achieves good effects.
The application of the fiber network sand consolidation technology in the field of oil and gas field exploitation technology is mainly characterized in that a certain amount of fibers are added into fracturing fluid, and proppant sand grains are fixed by a network structure formed by mutually winding fiber materials and proppants, so that the aims of sand prevention and proppant backflow resistance of an injection-production well are fulfilled. Fiber fracturing fluid performance research is carried out aiming at the degradation capability of the fiber, and when the temperature exceeds 90 ℃, the KTL2 type fiber can meet the engineering design requirement. The research on sand carrying performance of the fracturing fluid containing the fibers is carried out by using the jade leaves and the like, the settling time of the propping agent is greatly increased (increased by about 11 min) due to the addition of the fibers, and the sand carrying performance of the fracturing fluid is favorably improved. Guojianchun and the like research the dispersibility of the fibers in the fracturing fluid, the fibers can be uniformly dispersed in the guar gum base fluid, and the viscosity of the guar gum base fluid can be greatly improved by adding 0.4% of the fibers. The inventor believes that the sand control can be achieved without using a sieve tube by utilizing a stable three-dimensional net structure formed by mutually hooking and winding the bending, the curling and the spiral cross of the sand control fibers. The research of the beam Ninghui shows that the bridging stress peak value of the polypropylene fine fiber is 0.20-0.22 MPa, the bridging stress peak value of the polypropylene coarse fiber is 0.56MPa, the coarse fiber and the concrete matrix interface are connected tightly, and the chemical bonding force and the mechanical engagement force of the coarse fiber are stronger than those of the fine fiber. The Longzhi and other researches show that the higher the fiber volume fraction in the liquid discharge process is, the longer the fiber is, the smaller the proppant particles are, the larger the friction factor between the fiber and the proppant particles is, the better the sand control effect of the fiber on the proppant is, and the proppant is difficult to return out when the fracturing fluid flows back.
The anti-backflow additives are mainly classified into two types, namely, fiber anti-backflow additives and chemical anti-backflow additives. The fiber anti-backflow technology is characterized in that a fiber substance with certain flexibility is mixed in a sand carrying fluid and is injected into a stratum at the same time, the fibers and proppant particles interact through contact pressure and friction force to form a space network structure, so that the cohesive force of the proppant is enhanced and stabilized at an original position, and fluid can still freely pass through the space network structure, and the purpose of preventing the proppant from backflow is finally achieved. The fiber sand control technology does not need a curing reaction and does not need to close a well; the flowback process is well programmable, allowing for initial high speed flowback. Especially in recent years, the degradable fiber has attracted much attention due to the characteristic of little damage to the diversion after degradation. But the physical action of the fibers cannot improve the bearing capacity of the proppant; the binding effect on the propping agent is weakened after the fiber is degraded, and the risk of sand production is increased. The chemical anti-flowback additive is formed by reacting a chemical substance (generally a thermosetting resin) with a proppant, forming a three-dimensional network capable of percolation by means of adsorption on the surface of the proppant and curing, thereby reducing the flowback of the proppant. The method has good anti-backflow effect, the pressure bearing capacity of the propping agent is improved, but long shut-in time is needed, and the resin occupies gaps among the propping agents, so that the diversion is reduced to a certain extent. In general, in the conventional fracturing design of oil and gas wells, certain research and field application are provided for a fiber network, but the field is more limited in the aspect of evaluation of the flowback effect of the fracturing fluid, and relatively few research on the anti-proppant backflow after fracturing of the unconventional oil and gas wells is performed.
Disclosure of Invention
Based on the problems in the prior art, the invention aims to provide a composite chemical anti-backflow additive and a method for preventing a propping agent from backflow, which can effectively inhibit the propping agent from backflow and backflow, are beneficial to effectively supporting formation cracks, reduce the damage to the flow conductivity, prolong the service life of equipment and improve the comprehensive economic benefit of an oil field.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a composite chemical anti-backflow additive comprises raw materials of aqueous epoxy resin emulsion and degradable fibers, wherein the mass ratio of the aqueous epoxy resin emulsion to the degradable fibers is (0.1-3) to (0.05-0.5).
Further, the aqueous epoxy resin emulsion comprises the following components in parts by weight: 1 part of epoxy resin, 0.9-1.8 parts of water-soluble epoxy resin curing agent, 0.05-0.35 part of oil-soluble epoxy resin curing agent, 0.01-0.15 part of silane coupling agent and 10-30 parts of water.
As a further optimization of the technical scheme of the invention, the aqueous epoxy resin emulsion comprises the following components in parts by weight: 1 part of epoxy resin, 1.2 to 1.5 parts of water-soluble epoxy resin curing agent, 0.1 to 0.15 part of oil-soluble epoxy resin curing agent, 0.02 to 0.05 part of silane coupling agent and 15 to 20 parts of water.
Further, the epoxy resin is one or more of glycidyl ether epoxy resin, glycidyl ester epoxy resin and glycidyl amine epoxy resin.
Further, the water-soluble epoxy resin curing agent is one or more of polyamide resin modified epoxy resin and polyamine modified epoxy resin.
Further, the oil-soluble epoxy resin curing agent is one or more of an aromatic amine curing agent, a fatty amine curing agent and a modified body thereof.
Further, the silane coupling agent is one or more of silane coupling agents containing amino groups or epoxy groups.
Further, the preparation method of the water-based epoxy resin emulsion comprises the following steps:
s1, uniformly mixing 1 part by weight of epoxy resin and 1.2-1.5 parts by weight of water-soluble epoxy resin curing agent to obtain a mixture A;
s2, adding 0.1-0.15 part by weight of oil-soluble epoxy resin curing agent and 0.02-0.05 part by weight of silane coupling agent into the mixture A, and uniformly mixing to obtain a mixture B;
and S3, adding 15-20 parts by weight of water into the mixture B, and uniformly mixing to obtain the water-based epoxy resin emulsion.
Further, the degradable fiber is one or more of polylactic acid or copolymers thereof.
Furthermore, the diameter of the degradable fiber is 15-200 μm, and the length is 4-12 mm.
The invention further protects a method for preventing the backflow of the compound chemical propping agent, which comprises the steps of injecting the water-based epoxy resin emulsion and the degradable fiber into a stratum together with the propping agent, closing a well and curing for 4-15 h;
wherein, the water-based epoxy resin emulsion accounts for 0.1-3% of the weight of the proppant, and the degradable fiber accounts for 0.05-0.5% of the weight of the proppant.
As a further optimization of the invention, the method for preventing the backflow of the composite chemical proppant comprises the following steps:
stirring and dispersing the degradable fibers in the sand-carrying liquid, adding the aqueous epoxy resin emulsion and the propping agent, continuously stirring uniformly, injecting the mixture into the stratum through an injection pump, closing a well and curing for 8-12 hours;
wherein, the water-based epoxy resin emulsion accounts for 0.1-0.5 percent of the weight of the propping agent, and the degradable fiber accounts for 0.1-0.3 percent of the weight of the propping agent.
The reaction mechanism of the invention is as follows:
as shown in figure 1, after entering the stratum along with the sand-carrying fluid, the aqueous epoxy resin emulsion can be adsorbed on the surfaces of the proppant and the degradable fibers. The water-based epoxy resin emulsion contains epoxy resin and a curing agent, and the cross-linking curing reaction is carried out on the surfaces of the propping agent and the degradable fibers, so that the propping agent and the degradable fibers are glued together to achieve the purpose of backflow prevention.
By adopting the technical scheme, the invention has the advantages that:
1. the degradable fibers can provide the proppant backflow prevention capability at the initial stage, and the waterborne epoxy resin emulsion forms a polymer coating layer and a three-dimensional network structure after the surfaces of the degradable fibers and the proppant are cured, so that the bonding force and the pressure resistance among the proppants are improved; in the later period, the degradation of the degradable fibers releases partial space and pore channels, which is beneficial to improving the flow conductivity of the consolidation proppant.
2. The method for preventing the backflow of the composite chemical proppant provided by the invention is an effective method capable of inhibiting the backflow and the return flow of the proppant, is beneficial to effectively supporting formation fractures, reducing the damage to the flow conductivity, prolonging the service life of equipment and improving the comprehensive economic benefit of an oil field.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to clearly understand the technical solutions of the present invention and to implement the technical solutions according to the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of the mechanism of action of a compound chemical backflow prevention technology;
FIG. 2 is a photograph of a consolidated sand column formed by a composite chemical anti-reflux technique;
fig. 3 is a partial optical microscope photograph of consolidated sand formed by the composite chemical backflow prevention technique.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Detailed Description
The invention will be further understood by reference to the following detailed description of preferred embodiments of the invention and the examples included therein. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. To the extent that a definition of a particular term disclosed in the prior art is inconsistent with any definition provided herein, the definition of that term provided herein controls.
It should be noted that the implementation conditions used in the examples can be further adjusted according to the specific experimental environment, and the implementation conditions not mentioned are generally the conditions in the routine experiments. The preparation methods mentioned in the invention are all conventional methods unless specified otherwise; the various chemicals and chemicals mentioned in the following examples are all well known and used in the art, unless otherwise specified.
A composite chemical anti-backflow additive comprises raw materials of aqueous epoxy resin emulsion and degradable fibers, wherein the mass ratio of the aqueous epoxy resin emulsion to the degradable fibers is (0.1-3) to (0.05-0.5).
Further, the waterborne epoxy resin emulsion comprises the following components in parts by weight: 1 part of epoxy resin, 0.9-1.8 parts of water-soluble epoxy resin curing agent, 0.05-0.35 part of oil-soluble epoxy resin curing agent, 0.01-0.15 part of silane coupling agent and 10-30 parts of water.
As a further optimization of the technical scheme of the invention, the waterborne epoxy resin emulsion comprises the following components in parts by weight: 1 part of epoxy resin, 1.2 to 1.5 parts of water-soluble epoxy resin curing agent, 0.1 to 0.15 part of oil-soluble epoxy resin curing agent, 0.02 to 0.05 part of silane coupling agent and 15 to 20 parts of water.
Further, the epoxy resin is one or more of glycidyl ether epoxy resin, glycidyl ester epoxy resin and glycidyl amine epoxy resin; glycidyl ether type epoxy resins are preferred. The molecule is rich in epoxy groups and can react with a curing agent, a silane coupling agent and a degradable fiber surface group.
Further, the water-soluble epoxy resin curing agent is one or more of polyamide resin modified epoxy resin and polyamine modified epoxy resin; polyamine-modified epoxy resins are preferred. The molecules have good compatibility with epoxy resin, hydrophilic groups are introduced into the molecules, and the molecules are used as a curing agent and a dispersing agent of emulsion.
Further, the oil-soluble epoxy resin curing agent is one or more of aromatic amine curing agent, aliphatic amine curing agent and modified body thereof; the curing agent is preferably a modified aliphatic amine curing agent, and more preferably a phenolic-modified aliphatic amine epoxy resin curing agent. The molecules are beneficial to accelerating the curing speed of the epoxy emulsion and improving the strength of the consolidated sand.
Further, the silane coupling agent is one or more of silane coupling agents containing amino or epoxy groups, and the molecules are favorable for forming covalent bonds between the epoxy resin and the surface of the proppant.
Further, the preparation method of the water-based epoxy resin emulsion comprises the following steps:
s1, uniformly mixing 1 part by weight of epoxy resin and 1.2-1.5 parts by weight of water-soluble epoxy resin curing agent to obtain a mixture A;
s2, adding 0.1-0.15 part by weight of oil-soluble epoxy resin curing agent and 0.02-0.05 part by weight of silane coupling agent into the mixture A, and uniformly mixing to obtain a mixture B;
and S3, adding 15-20 parts by weight of water into the mixture B, and uniformly mixing to obtain the water-based epoxy resin emulsion.
When the water-based epoxy resin emulsion is prepared, the epoxy resin and the water-soluble epoxy resin curing agent are mixed, then the oil-soluble epoxy resin curing agent and the silane coupling agent are added, and finally water is added, so that the emulsion is well dispersed, and the agglomeration is avoided.
Further, the degradable fiber is one or more of polylactic acid or a copolymer thereof. The polylactic acid fiber is preferably one of polylactic acid fiber, polylactic caprolactone fiber, polyglycolic acid fiber, and polycaprolactone fiber, and more preferably polylactic acid fiber. The degradable fibers can provide proppant backflow prevention capability at an early stage.
Further, the diameter of the degradable fiber is 15 to 200 μm, preferably 20 to 200 μm; the length is 4-12 mm, preferably 6-8 mm; the molecular weight of the degradable fiber is 40000-100000, preferably 50000-70000.
The invention further protects a method for preventing the backflow of the composite chemical proppant, which comprises the steps of injecting the water-based epoxy resin emulsion and the degradable fiber into a stratum together with the proppant, closing a well and curing for 4-15 hours; wherein, the water-based epoxy resin emulsion accounts for 0.1-3% of the weight of the proppant, and the degradable fiber accounts for 0.05-0.5% of the weight of the proppant.
As a further optimization of the invention, the method for preventing the backflow of the composite chemical proppant comprises the following steps:
stirring and dispersing the degradable fibers in the sand-carrying liquid, then adding the aqueous epoxy resin emulsion and the propping agent, continuously stirring uniformly, injecting into a stratum, closing a well and curing for 8-12 hours; wherein, the water-based epoxy resin emulsion accounts for 0.1-0.5 percent of the weight of the propping agent, and the degradable fiber accounts for 0.1-0.3 percent of the weight of the propping agent.
As shown in figure 1, the epoxy emulsion can be adsorbed on the surfaces of the proppant and the degradable fibers after entering the stratum along with the sand-carrying fluid. The epoxy emulsion contains epoxy resin and a curing agent, and the crosslinking and curing reaction is carried out on the surfaces of the propping agent and the degradable fibers, so that the propping agent and the degradable fibers are cemented together to achieve the purpose of backflow prevention.
In addition, it is worth mentioning that the degradable fibers can provide the anti-backflow capacity of the propping agent in the initial stage, and the polymer coating layer and the three-dimensional network structure are formed after the surface of the degradable fibers and the propping agent is solidified by the aqueous epoxy resin emulsion, so that the bonding force and the pressure resistance among the propping agents are improved; in the later period, the degradation of the degradable fibers releases partial space and pore channels, which is beneficial to improving the flow conductivity of the consolidation proppant.
The invention will be further described with reference to preferred embodiments:
example 1
This example first provides a formulation of a waterborne epoxy resin emulsion:
(1) Weighing 100g of glycidyl ether epoxy resin (brand: E-44, available from Nantong star synthetic materials Co., ltd.) and 150g of polyamine modified epoxy resin water-soluble epoxy curing agent (brand: CYDHD-220, available from Balin petrochemical) and mechanically stirring uniformly to obtain a mixture A;
(2) Weighing 10g of phenolic aldehyde modified aliphatic amine oil-soluble epoxy curing agent (brand: T-31, purchased from Jinningsan and Chemicals) and 2g of amino-containing silane coupling agent (brand: KH-550, purchased from Nanjing Shuangguan), adding the mixture into the mixture A, and uniformly stirring to obtain a mixture B;
(3) Adding 2000g of water into the mixture B, and uniformly stirring to obtain the water-based epoxy resin emulsion.
The embodiment also provides a method for preventing backflow of the composite chemical proppant, which comprises the following steps:
adding degradable fiber polylactic acid (with the diameter of 150 mu m, the length of 8mm and the molecular weight of 50000) accounting for 0.2 percent of the mass of the proppant into the sand carrying liquid, and uniformly dispersing; then adding aqueous epoxy resin emulsion (calculated by organic components) accounting for 0.2 percent of the mass of the propping agent. Stirring, transferring into a 40 deg.C oven, curing for 12h, pouring out the upper liquid to obtain consolidated sand column with macroscopic morphology as shown in FIG. 2, and enlarged part as shown in FIG. 3.
As can be seen from fig. 2 and 3, after the epoxy emulsion is cured, the quartz sand and the degradable fiber are effectively cemented together, and the risk of backflow is reduced.
Example 2
This example first provides a preparation of a waterborne epoxy resin emulsion:
(1) Weighing 100g of glycidyl ether epoxy resin (trade name: E-51, purchased from south Asia electronic materials (Kunshan) Co., ltd.) and 130g of polyamine modified epoxy resin water-soluble epoxy curing agent (trade name: F0705, purchased from Jitian chemical industry) and mechanically stirring uniformly to obtain a mixture A;
(2) Weighing 13g of phenolic aldehyde modified aliphatic amine oil-soluble epoxy curing agent (trademark: NC-541LV, available from Kadelia) and 3g of amino-containing silane coupling agent (trademark: KH-792, available from Nanjing eosin), adding into the mixture A, and stirring uniformly to obtain a mixture B;
(3) Adding 1500g of water into the mixture B, and uniformly stirring to obtain the water-based epoxy resin emulsion.
The embodiment also provides a method for preventing backflow of the composite chemical proppant, which comprises the following steps:
firstly, adding polylactic acid degradable fibers (with the diameter of 200 mu m, the length of 6mm and the molecular weight of 60000) accounting for 0.3 percent of the mass of the proppant into the sand carrying liquid, and uniformly dispersing; then adding epoxy resin emulsion (calculated by organic components) accounting for 0.1 percent of the weight of the propping agent, uniformly stirring, transferring into a 40 ℃ oven, curing for 10 hours, and pouring out the upper liquid to obtain the consolidated sand column.
Example 3
This example first provides a formulation of a waterborne epoxy resin emulsion:
(1) Weighing 100g of glycidyl amine epoxy resin (the brand: RH154B, purchased from Shenzhen Shenhui speciality chemical Co., ltd.), 120g of polyamide resin modified epoxy resin water-soluble epoxy curing agent (the brand: AB-HGC-W60, purchased from Zhejiang Anbang New Material Co., ltd.), and mechanically stirring uniformly to obtain a mixture A;
(2) Weighing 15g of phenolic aldehyde modified aliphatic amine oil-soluble epoxy curing agent (trademark: NC-541LV, purchased from Kadelia) and 5g of epoxy-containing silane coupling agent (KH-560, purchased from Guangdong green Wei New Material science and technology Co., ltd.), adding into the mixture A, and stirring uniformly to obtain a mixture B;
(3) Adding 1500g of water into the mixture B, and uniformly stirring to obtain the water-based epoxy resin emulsion.
The embodiment also provides a method for preventing backflow of the composite chemical proppant, which comprises the following steps:
firstly, adding polylactic acid degradable fibers (with the diameter of 200 mu m, the length of 6mm and the molecular weight of 60000) accounting for 0.3 percent of the mass of the proppant into the sand carrying liquid, and uniformly dispersing; then adding epoxy resin emulsion (calculated by organic components) accounting for 0.1 percent of the weight of the propping agent, uniformly stirring, transferring into a 40 ℃ oven, curing for 10 hours, and pouring out the upper liquid to obtain the consolidated sand column.
Comparative example 1
This example first provides a formulation of a waterborne epoxy resin emulsion:
(1) Weighing 100g of glycidyl ether epoxy resin (brand: E-44, available from Nantong star synthetic materials Co., ltd.) and 150g of polyamine modified epoxy resin water-soluble epoxy curing agent (brand: CYDHD-220, available from Balin petrochemical) and mechanically stirring uniformly to obtain a mixture A;
(2) Weighing 10g of modified aliphatic amine oil-soluble epoxy curing agent (brand: T-31, jinningsan and Chemicals) and 2g of amino-containing silane coupling agent (brand: KH-550, obtained from Nanjing eosin), adding the mixture into the mixture A, and uniformly stirring to obtain a mixture B;
(3) 2000g of water was added to the mixture B and stirred well.
The embodiment also provides a method for preventing the backflow of the proppant, which comprises the following steps:
adding epoxy resin emulsion (calculated by organic components) accounting for 0.2 percent of the weight of the propping agent into the sand carrying liquid for uniform dispersion, transferring the mixture into a 40 ℃ oven after uniform stirring, and pouring out the upper liquid after curing for 12 hours to obtain the consolidated sand column.
Comparative example 2
This example first provides a formulation of a waterborne epoxy resin emulsion:
(1) Weighing 100g of glycidyl ether epoxy resin (trade name: E-51, purchased from south Asia electronic materials (Kunshan) Co., ltd.) and 130g of polyamine modified epoxy resin water-soluble epoxy curing agent (trade name: F0705, purchased from Jitian chemical industry) and mechanically stirring uniformly;
(2) Weighing 13g of phenolic aldehyde modified aliphatic amine oil-soluble epoxy curing agent (trademark: NC-541LV, purchased from Kadelia) and 3g of amino-containing silane coupling agent (trademark: KH-792, purchased from Nanjing eosin), adding into the mixture, and stirring uniformly;
(3) 1500g of water were added to the above mixture and stirred well.
The embodiment also provides a method for preventing the backflow of the proppant, which comprises the following steps:
and (3) uniformly stirring the epoxy resin emulsion (calculated by organic components) accounting for 0.1 percent of the weight of the propping agent, transferring the epoxy resin emulsion into a 40 ℃ oven, curing for 10 hours, and pouring out the upper liquid to obtain the consolidated sand column.
The consolidated sand prepared in the examples 1-3 and the comparative examples 1-2 is subjected to an experimental test of the compressive strength and the breakage rate, wherein the test of the compressive strength is carried out according to the industrial standard SY/T5276-2000 determination of the flexural strength, the compressive strength and the gas permeability of the chemical sand control artificial core. The fracture rate was determined according to the industry standard SY/T5108-2014 proppant Performance for hydraulic fracturing and gravel packing operations. The results of the experiment are shown in table 1.
Table 1 results of the laboratory experiments: compressive strength and crushing rate of consolidated sand
| Compressive strength MPa | Proppant percent crush (69 MPa) | |
| Example 1 | 0.324 | 28.5 |
| Comparative example 1 | 0.253 | 25.3 |
| Example 2 | 0.201 | 27.2 |
| Example 3 | 0.262 | 26.4 |
| Comparative example 2 | 0.154 | 25.8 |
| Original quartz sand | Is not consolidated | 36.9 |
As shown in Table 1, the results of the laboratory experiments show that the compressive strength of the consolidated sand column formed by the epoxy emulsion and the degradable fiber composite additive is greatly improved compared with that of the single chemical additive system (comparative example 1 and comparative example 2). Compared with the quartz sand raw sand, the crushing rate of the consolidated sand is reduced by more than 20 percent.
In conclusion, the application of the composite chemical backflow prevention technology provided by the invention can reduce the flowback of the propping agent, is beneficial to the stability of formation cracks, reduces the damage to the flow conductivity, prolongs the service life of equipment and is beneficial to improving the comprehensive economic benefit of an oil field.
The foregoing disclosure discloses only specific embodiments of the present invention, but is not intended to limit the invention thereto. The chemicals used to formulate the epoxy emulsions in the examples are not particularly limited by their manufacturers and brands, and variations that can be contemplated by those skilled in the art are intended to fall within the scope of the present invention.
Claims (10)
1. A compound chemical anti-backflow additive is characterized in that: the raw materials of the compound chemical anti-backflow additive comprise aqueous epoxy resin emulsion and degradable fibers, wherein the mass ratio of the aqueous epoxy resin emulsion to the degradable fibers is (0.1-3) to (0.05-0.5).
2. The compound chemical backflow-preventing additive as claimed in claim 1, wherein: the waterborne epoxy resin emulsion comprises the following components in parts by weight: 1 part of epoxy resin, 0.9-1.8 parts of water-soluble epoxy resin curing agent, 0.05-0.35 part of oil-soluble epoxy resin curing agent, 0.01-0.15 part of silane coupling agent and 10-30 parts of water.
3. The compound chemical backflow prevention additive as claimed in claim 1, wherein: the waterborne epoxy resin emulsion comprises the following components in parts by weight: 1 part of epoxy resin, 1.2 to 1.5 parts of water-soluble epoxy resin curing agent, 0.1 to 0.15 part of oil-soluble epoxy resin curing agent, 0.02 to 0.05 part of silane coupling agent and 15 to 20 parts of water.
4. A composite chemical anti-backflow additive according to claim 2 or 3, characterized in that: the epoxy resin is one or more of glycidyl ether epoxy resin, glycidyl ester epoxy resin and glycidyl amine epoxy resin.
5. A composite chemical anti-backflow additive according to claim 2 or 3, characterized in that: the water-soluble epoxy resin curing agent is one or more of polyamide resin modified epoxy resin and polyamine modified epoxy resin;
the oil-soluble epoxy resin curing agent is one or more of aromatic amine curing agent, aliphatic amine curing agent and modified body thereof.
6. A composite chemical anti-backflow additive according to claim 2 or 3, characterized in that: the silane coupling agent is one or more of silane coupling agents containing amino or epoxy groups.
7. The compound chemical anti-reflux additive as claimed in claim 2 or 3, wherein the preparation method of the aqueous epoxy resin emulsion comprises the following steps:
s1, uniformly mixing 1 part by weight of epoxy resin and 1.2-1.5 parts by weight of water-soluble epoxy resin curing agent to obtain a mixture A;
s2, adding 0.1-0.15 part by weight of oil-soluble epoxy resin curing agent and 0.02-0.05 part by weight of silane coupling agent into the mixture A, and uniformly mixing to obtain a mixture B;
and S3, adding 15-20 parts by weight of water into the mixture B, and uniformly mixing to obtain the water-based epoxy resin emulsion.
8. The compound chemical backflow-preventing additive as claimed in claim 1, wherein: the degradable fiber is one or more of polylactic acid or copolymers thereof.
9. The composite chemical backflow-preventing additive according to claim 1 or 7, wherein: the diameter of the degradable fiber is 15-200 mu m, and the length of the degradable fiber is 4-12 mm.
10. The method for preventing backflow of the composite chemical proppant is characterized by comprising the following steps of:
injecting the water-based epoxy resin emulsion and the degradable fiber into the stratum together with the propping agent, closing the well and curing for 4-15 h;
wherein, the water-based epoxy resin emulsion accounts for 0.1-3% of the weight of the proppant, and the degradable fiber accounts for 0.05-0.5% of the weight of the proppant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211439857.4A CN115873587B (en) | 2022-11-17 | 2022-11-17 | Composite chemical backflow-preventing additive and proppant backflow-preventing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211439857.4A CN115873587B (en) | 2022-11-17 | 2022-11-17 | Composite chemical backflow-preventing additive and proppant backflow-preventing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115873587A true CN115873587A (en) | 2023-03-31 |
| CN115873587B CN115873587B (en) | 2024-01-23 |
Family
ID=85760130
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211439857.4A Active CN115873587B (en) | 2022-11-17 | 2022-11-17 | Composite chemical backflow-preventing additive and proppant backflow-preventing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115873587B (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1344775A (en) * | 2001-10-30 | 2002-04-17 | 中国石油大港油田油气勘探开发技术研究中心工艺所 | Sand preventing material for oil well |
| CN1927992A (en) * | 2006-09-12 | 2007-03-14 | 辽河石油勘探局 | Preparation method of resin fibre for oil field chemistry sand-proof |
| CN101265798A (en) * | 2008-01-31 | 2008-09-17 | 哈尔滨市宏昌石油助剂有限公司 | Sieve tube free composite fracturing fibre sand prevention process |
| CN101942296A (en) * | 2010-09-10 | 2011-01-12 | 中国石油天然气股份有限公司 | Fiber composite sand control material and preparation method thereof |
| CN103013485A (en) * | 2012-12-12 | 2013-04-03 | 中国石油天然气股份有限公司 | Modified resin sand consolidation agent as well as preparation method and application thereof |
| CN104405360A (en) * | 2014-10-27 | 2015-03-11 | 中石化胜利油田分公司采油工艺研究院 | Fracturing method capable of improving sand-carrying performance of fracturing liquid |
| CN106520090A (en) * | 2015-09-11 | 2017-03-22 | 重庆鼎顺隆能源技术有限责任公司 | Fiber-reinforced composite material for fractured easy-to-drill bridge plugs for oil-gas downholes |
| CN108315005A (en) * | 2017-01-18 | 2018-07-24 | 北京大学 | It is a kind of with high flow conductivity without sand fracturing fluid, preparation method and fracturing technology and application |
| CN109423263A (en) * | 2017-08-30 | 2019-03-05 | 中国石油化工股份有限公司 | A kind of felted borehole wall strengthening agent and preparation method |
| CN110454120A (en) * | 2019-08-13 | 2019-11-15 | 青岛大地新能源技术研究院 | A kind of construction method of oil-water well autohemagglutination sand control |
| CN110684517A (en) * | 2019-10-23 | 2020-01-14 | 四川捷贝通能源科技有限公司 | Self-polymerization consolidation compression-resistant permeation-increasing temperature-resistant sand control agent |
| CN115012901A (en) * | 2022-07-19 | 2022-09-06 | 成都劳恩普斯科技有限公司 | Proppant efficient laying multistage fiber sand prevention experimental method |
-
2022
- 2022-11-17 CN CN202211439857.4A patent/CN115873587B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1344775A (en) * | 2001-10-30 | 2002-04-17 | 中国石油大港油田油气勘探开发技术研究中心工艺所 | Sand preventing material for oil well |
| CN1927992A (en) * | 2006-09-12 | 2007-03-14 | 辽河石油勘探局 | Preparation method of resin fibre for oil field chemistry sand-proof |
| CN101265798A (en) * | 2008-01-31 | 2008-09-17 | 哈尔滨市宏昌石油助剂有限公司 | Sieve tube free composite fracturing fibre sand prevention process |
| CN101942296A (en) * | 2010-09-10 | 2011-01-12 | 中国石油天然气股份有限公司 | Fiber composite sand control material and preparation method thereof |
| CN103013485A (en) * | 2012-12-12 | 2013-04-03 | 中国石油天然气股份有限公司 | Modified resin sand consolidation agent as well as preparation method and application thereof |
| CN104405360A (en) * | 2014-10-27 | 2015-03-11 | 中石化胜利油田分公司采油工艺研究院 | Fracturing method capable of improving sand-carrying performance of fracturing liquid |
| CN106520090A (en) * | 2015-09-11 | 2017-03-22 | 重庆鼎顺隆能源技术有限责任公司 | Fiber-reinforced composite material for fractured easy-to-drill bridge plugs for oil-gas downholes |
| CN108315005A (en) * | 2017-01-18 | 2018-07-24 | 北京大学 | It is a kind of with high flow conductivity without sand fracturing fluid, preparation method and fracturing technology and application |
| CN109423263A (en) * | 2017-08-30 | 2019-03-05 | 中国石油化工股份有限公司 | A kind of felted borehole wall strengthening agent and preparation method |
| CN110454120A (en) * | 2019-08-13 | 2019-11-15 | 青岛大地新能源技术研究院 | A kind of construction method of oil-water well autohemagglutination sand control |
| CN110684517A (en) * | 2019-10-23 | 2020-01-14 | 四川捷贝通能源科技有限公司 | Self-polymerization consolidation compression-resistant permeation-increasing temperature-resistant sand control agent |
| CN115012901A (en) * | 2022-07-19 | 2022-09-06 | 成都劳恩普斯科技有限公司 | Proppant efficient laying multistage fiber sand prevention experimental method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115873587B (en) | 2024-01-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6892813B2 (en) | Methods for preventing fracture proppant flowback | |
| US7838469B2 (en) | Fusing materials for prevention of lost circulation | |
| US7343973B2 (en) | Methods of stabilizing surfaces of subterranean formations | |
| AU769119B2 (en) | Stimulating fluid production from unconsolidated formations | |
| US8082994B2 (en) | Methods for enhancing fracture conductivity in subterranean formations | |
| US7325608B2 (en) | Methods of hydraulic fracturing and of propping fractures in subterranean formations | |
| EP1859001B1 (en) | Methods of creating high porosity propped fractures | |
| US20080006405A1 (en) | Methods and compositions for enhancing proppant pack conductivity and strength | |
| US20050173116A1 (en) | Resin compositions and methods of using resin compositions to control proppant flow-back | |
| WO2008141039A1 (en) | Increasing buoyancy of well treating materials | |
| AU2009357406B2 (en) | A method of fluid slug consolidation within a fluid system in downhole applications | |
| WO2009078745A1 (en) | Proppant flowback control using encapsulated adhesive materials | |
| WO2009088315A1 (en) | Coated proppant and method of proppant flowback control | |
| CA2906714A1 (en) | A proppant | |
| CA2972613A1 (en) | Polyamide resins for coating of sand or ceramic proppants used in hydraulic fracturing | |
| US11447690B2 (en) | Enhancing propped fracture conductivity in subterranean wells | |
| CN111285642B (en) | Plugging agent, preparation method and application thereof | |
| US7806181B2 (en) | Technique to limit proppant carry-over out of fracture | |
| CN115873587B (en) | Composite chemical backflow-preventing additive and proppant backflow-preventing method | |
| CN115029118B (en) | Low-temperature sand-preventing resin sand for oil-gas well and preparation method thereof | |
| CA3044191A1 (en) | Methods for treating fracture faces in propped fractures using fine particulates | |
| US20170073575A1 (en) | Dendritic polymers for use as surface modification agents |
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 |