CN113831457A - Preparation method of supramolecular material for oil well sand prevention - Google Patents
Preparation method of supramolecular material for oil well sand prevention Download PDFInfo
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- CN113831457A CN113831457A CN202111127463.0A CN202111127463A CN113831457A CN 113831457 A CN113831457 A CN 113831457A CN 202111127463 A CN202111127463 A CN 202111127463A CN 113831457 A CN113831457 A CN 113831457A
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F273/00—Macromolecular compounds obtained by polymerising monomers on to polymers of sulfur-containing monomers as defined in group C08F28/00
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/56—Compositions for consolidating loose sand or the like around wells without excessively decreasing the permeability thereof
- C09K8/57—Compositions based on water or polar solvents
- C09K8/575—Compositions based on water or polar solvents containing organic compounds
- C09K8/5751—Macromolecular compounds
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Abstract
The invention discloses a preparation method of a supramolecular material for oil well sand prevention, which comprises the steps of mixing an allyl sodium sulfonate monomer and an ester monomer according to the mass ratio of 2-3: 1-2, and stirring under the water bath condition to prepare a low-molecular polymer A-1; mixing a propylene monomer, a polymerization accelerator and a low-molecular polymer A-1 according to a mass ratio of 3-4: 2-3: 3-5, and stirring under a water bath condition to obtain a component A; mixing a solvent, an amide monomer and an ester monomer according to a mass ratio of 8-12: 3-5: 3-9, and stirring under a water bath condition to obtain a component B; and mixing the component A and the component B according to the mass ratio of 2-4: 3-5, and stirring under the water bath condition to obtain the supramolecular material. The supermolecule material for oil well sand control can be directly injected into a stratum at a low ground viscosity, so that the injection process is simplified; the flow of sand produced by the treated rock core is increased to 12-16.25 times, and the sand control effectiveness is greatly prolonged.
Description
Technical Field
The invention relates to a preparation method of a supramolecular material for oil well sand prevention, and belongs to the technical field of oil and gas field development.
Background
The formation sand produced by oil wells includes two main categories of rock skeleton destruction and particle migration. Geological factors causing formation sand production comprise reservoir structure, sedimentary facies, lithology, rock cementing type, cementing material type, clay mineral composition, argillaceous content, reservoir fluid type and the like, and the influence factors belong to objectively existing intrinsic factors. The sand production risk of the reservoir rock can be increased by factors such as lower mechanical strength of the formation rock, further reduction of rock strength caused by water breakthrough of the reservoir, increase of effective stress on the rock caused by pressure failure of the reservoir in the middle and later periods of oil field development and the like. The sand production of the oil well can cause a series of problems of production reduction or production stop of the oil well, equipment abrasion, casing damage, oil well abandonment and the like, so the sand prevention of the oil well is one of the keys for ensuring the efficient development of the oil and gas field.
The current technologies for oil well sand control include two categories, mechanical sand control and chemical sand control, wherein the mechanical sand control includes gravel pack sand control, pre-pack sand control and the like; the chemical sand control is to inject some proper chemical agent into the stratum to consolidate the stratum sand near the well hole and prevent the stratum sand from flowing during the production of the oil well, and the injected chemical agent is mainly resin. The chemical sand control has the advantages of no influence on the later yield-increasing operation of the oil well and low cost, thereby being widely applied.
The invention provides a sand control proppant as well as a preparation method and application thereof (publication No. CN 110423604A). the carboxyl-containing organic matter can perform ring-opening reaction with epoxy resin in the cross-linking reaction film-forming process, so that the carboxyl-containing organic matter and the epoxy resin as well as the epoxy resin and the epoxy resin are cross-linked, a complex cross-linking structure is more stable and has better cohesiveness, the adhesive force among the proppants is enhanced, the adhesive force between a resin film and supporting aggregate is improved, the consolidation degree of the proppant in a stratum is improved, and the aim of sand control is fulfilled; however, the sand control proppant needs to be injected with the sand control agent and the proppant at the same time, and the technology is mainly used for preventing the proppant from flowing back, cannot ensure the consolidation of the formation sand in the near wellbore zone, and has low efficiency. The invention discloses a sand control method in the invention patent 'construction method of self-polymerization sand control for oil-water wells (publication number CN 110454120A)', which achieves the aim of sand control by injecting self-polymerization liquid, self-polymerization auxiliary agent and cementing liquid; however, the sand gathering and preventing method needs to inject the self-gathering liquid, the self-gathering auxiliary agent and the cementing liquid in a segmented manner, and the injection process is complicated.
In order to overcome the defects of low sand control efficiency, complex injection process and the like commonly existing in the conventional chemical sand control method, a sand control material with high sand control efficiency and simple injection process needs to be developed. The supramolecular material has the characteristic of thermal response, so that the supramolecular material is low in viscosity under the ground temperature condition and is easy to inject into a stratum; after the supermolecule material is injected into the stratum, the supermolecule material is stimulated by the temperature of the stratum, a consolidation body with certain elasticity and strength can be formed through the action of hydrogen bonds, and stratum sand is consolidated, so that the problem of formation sand production is solved.
Disclosure of Invention
The invention aims to provide a preparation method of a supramolecular material for oil well sand prevention, wherein the supramolecular material has low viscosity under the ground temperature condition, a consolidation body with certain elasticity and strength is formed after the supramolecular material is injected into a stratum, stratum sand is consolidated, the strength of the stratum sand is improved, and the problem of stratum sand production is solved.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a preparation method of a supramolecular material for oil well sand prevention; the method comprises the following steps:
(1) mixing an allyl sodium sulfonate monomer and an ester monomer according to a mass ratio of 2-3: 1-2, and continuously stirring for 2-3 hours under a water bath condition to prepare a low molecular polymer A-1;
(2) mixing a propylene monomer, a polymerization accelerator and a low-molecular polymer A-1 according to a mass ratio of 3-4: 2-3: 3-5, and continuously stirring for 2-3 hours under a water bath condition to obtain a component A;
(3) mixing a solvent, an amide monomer and an ester monomer according to a mass ratio of 8-12: 3-5: 3-9, and continuously stirring for 2-3 hours under a water bath condition to obtain a component B;
(4) mixing the component A and the component B according to the mass ratio of 2-4: 3-5, and stirring and reacting for 1-2 hours under the water bath condition to obtain the supermolecule material for oil well sand prevention.
The ester monomer in the step (1) is methyl methacrylate, ethyl methacrylate or a mixture of the two substances.
The polymerization accelerator in the step (2) is sodium persulfate, ammonium persulfate or a mixture of the two substances.
The solvent in the step (3) is methanol, ethanol or a mixture of the two substances.
The amide monomer in the step (3) is NN-methylene bisacrylamide, N-isopropyl acrylamide, methacrylamide or a mixture of any two of the N-methylene bisacrylamide, the N-isopropyl acrylamide and the methacrylamide.
The ester monomer in the step (3) is ethylene glycol dimethacrylate, ethylene glycol dimethacrylate or a mixture of the two substances.
The water bath conditions of the steps (1) and (2) are 80-100 ℃.
The water bath condition of the step (3) is 60-80 ℃.
The water bath condition of the step (4) is 40-60 ℃.
Sodium allylsulfonate monomer and ester monomer are raw materials for preparing low molecular polymer A-1 by polymerization reaction; the propylene monomer and the low molecular polymer A-1 are subjected to block copolymerization to prepare a component A with higher molecular weight; the polymerization accelerator accelerates the block copolymerization reaction, improves the polymerization efficiency and reduces the polymerization temperature; the solvent is used for dissolving the amide monomer and the ester monomer, so that the contact area of the amide monomer and the ester monomer is increased, and the reaction efficiency is improved; the component A and the component B can perform recognition and self-assembly through hydrogen bonds to form a supramolecular material with temperature response. The supramolecular material has low viscosity under the ground temperature condition, is easy to inject, is stimulated by the formation temperature after being injected into the formation, and forms a consolidation body with certain elasticity and strength through the action of hydrogen bonds to consolidate formation sand.
The scheme provided by the invention has the following beneficial effects:
compared with the sand control technology in the prior art, the supramolecular material for oil well sand control provided by the invention can be directly injected into the stratum at a lower ground viscosity, so that the injection process is simplified; the core treated by the supermolecule material provided by the invention has the advantages that the sand production flow is increased to 12-16.25 times, the structural stability of the core is greatly improved, and the sand prevention effectiveness is greatly prolonged in practical application.
Detailed Description
The present invention will be described in further detail with reference to examples.
Example 1: the embodiment provides a supramolecular material for oil well sand control, which comprises the following steps:
(1) mixing 20g of sodium allylsulfonate and 10g of methyl methacrylate, and continuously stirring for 2.5h under the condition of a water bath at 90 ℃ to prepare a low-molecular polymer A-1;
(2) mixing 12g of propylene, 8g of sodium persulfate and 20g of low molecular polymer A-1, and continuously stirring for 3 hours under the condition of a water bath at 95 ℃ to obtain a component A;
(3) mixing 10g of methanol, 4g of NN-methylene bisacrylamide and 6g of ethylene glycol dimethacrylate, and continuously stirring for 3 hours under the condition of 70 ℃ water bath to prepare a component B;
(4) and (3) mixing 20g of the component A and 20g of the component B, and stirring and reacting for 2 hours under the condition of water bath at the temperature of 60 ℃ to prepare the supramolecular material for oil well sand prevention.
Example 2: the embodiment provides a supramolecular material for oil well sand control, which comprises the following steps:
(1) mixing 15g of sodium allylsulfonate and 15g of ethyl methacrylate, and continuously stirring for 3h under the condition of 80 ℃ water bath to prepare a low molecular polymer A-1;
(2) mixing 15g of propylene, 15g of ammonium persulfate and 20g of low-molecular polymer A-1, and continuously stirring for 2.5 hours under the condition of 80 ℃ water bath to prepare a component A;
(3) mixing 18g of methanol, 6g N-isopropyl acrylamide and 6g of ethylene glycol dimethacrylate, and continuously stirring for 2.5 hours under the condition of 80 ℃ water bath to obtain a component B;
(4) and (3) mixing 20g of the component A and 30g of the component B, and stirring and reacting for 1.5h under the condition of water bath at 50 ℃ to prepare the supramolecular material for oil well sand prevention.
Example 3: the embodiment provides a supramolecular material for oil well sand control, which comprises the following steps:
(1) mixing 15g of sodium allylsulfonate, 5g of methyl methacrylate and 5g of ethyl methacrylate, and continuously stirring for 2 hours at the temperature of 100 ℃ in a water bath to prepare a low-molecular polymer A-1;
(2) mixing 12g of propylene, 3g of ammonium persulfate, 3g of sodium persulfate and 12g of low-molecular polymer A-1, and continuously stirring for 2 hours under the condition of water bath at 100 ℃ to prepare a component A;
(3) mixing 12g of ethanol, 3g of methacrylamide and 9g of ethylene glycol dimethacrylate, and continuously stirring for 2 hours under the condition of water bath at the temperature of 60 ℃ to obtain a component B;
(4) and (3) mixing 30g of the component A and 24g of the component B, and stirring and reacting for 1h under the condition of water bath at 40 ℃ to prepare the supramolecular material for oil well sand prevention.
The sand control ability of the supramolecular material was tested by a displacement experiment (jiyuan fangchang oil production well sand control technical research [ D ]. seian university of petroleum, section 2018.3.3.3) commonly used in the petroleum industry:
(1) taking a plurality of actual stratum rock samples to prepare rock cores with the length of 10cm and the diameter of 2.5cm, putting the rock cores into a rock core holder, setting the temperature to be 80 ℃ to simulate the stratum temperature environment, sequentially injecting KCl solution with the mass concentration of 2% according to the flow increasing sequence of 0.5mL/min, 1mL/min and 1.5mL/min, maintaining for 30s under each flow condition until sand appears at the outflow end of the rock core holder, and recording the flow at the moment as V1；
(2) Injecting 2PV (i.e. 2 times core pore volume) of the supramolecular material provided in example 1 at a flow rate of 0.5 mL/min;
(3) sequentially injecting KCl solution with mass concentration of 2% according to the flow increasing sequence of 0.5mL/min, 1mL/min and 1.5mL/min, maintaining for 30s under each flow condition until sand appears at the outflow end of the core holder, and recording the flow at the moment as V2。
The sand control performance of the supramolecular materials provided in example 1, example 2, and example 3 was tested according to the above experimental procedures to obtain the following test results:
TABLE 1 Experimental test results (80 deg.C)
According to experimental test results, the flow of produced sand of the rock core treated by the supermolecular material provided by the invention is increased to 12-16.25 times, the structural stability of the rock core is effectively improved, and the aim of preventing sand can be achieved.
Use of the supramolecular material of example 2 for sand control of a well in situThe sand production of the well is 0.29m after mechanical sand control is carried out in 5 months in 20203D, after 10 months of 2020, the supramolecular material in example 2 is adopted to carry out chemical sand control, the daily yield is 35.2m3No formation sand is produced, and until now, no formation sand is produced, and the sand control effect is good.
In conclusion, the supramolecular material for oil well sand prevention and the preparation method thereof provided by the invention can simplify an injection process, realize high-efficiency sand prevention and solve the problem of sand production of an oil well.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and other embodiments of the present invention will be easily conceived by those skilled in the art after the present invention is disclosed. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A preparation method of a supramolecular material for oil well sand prevention is characterized by comprising the following steps:
(1) mixing an allyl sodium sulfonate monomer and an ester monomer according to a mass ratio of 2-3: 1-2, and continuously stirring for 2-3 hours under a water bath condition to prepare a low molecular polymer A-1;
(2) mixing a propylene monomer, a polymerization accelerator and a low-molecular polymer A-1 according to a mass ratio of 3-4: 2-3: 3-5, and continuously stirring for 2-3 hours under a water bath condition to obtain a component A;
(3) mixing a solvent, an amide monomer and an ester monomer according to a mass ratio of 8-12: 3-5: 3-9, and continuously stirring for 2-3 hours under a water bath condition to obtain a component B;
(4) mixing the component A and the component B according to the mass ratio of 2-4: 3-5, and stirring and reacting for 1-2 hours under the water bath condition to obtain the supermolecule material for oil well sand prevention.
2. The method according to claim 1, wherein the ester monomer of step (1) is methyl methacrylate, ethyl methacrylate or a mixture thereof.
3. The method according to claim 1, wherein the polymerization accelerator in step (2) is sodium persulfate, ammonium persulfate or a mixture of these two substances.
4. The method according to claim 1, wherein the solvent in step (3) is methanol, ethanol or a mixture of these two substances.
5. The method according to claim 1, wherein the amide monomer in step (3) is NN-methylenebisacrylamide, N-isopropylacrylamide, methacrylamide, or a mixture of any two thereof.
6. The method according to claim 1, wherein the ester monomer of step (3) is ethylene glycol dimethacrylate, ethylene glycol dimethacrylate or a mixture thereof.
7. The method according to claim 1, wherein the water bath conditions in the steps (1) and (2) are 80 to 100 ℃.
8. The method according to claim 1, wherein the water bath in the step (3) is performed under a temperature of 60 to 80 ℃.
9. The method according to claim 1, wherein the water bath in the step (4) is carried out under a temperature of 40 to 60 ℃.
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| CN202111127463.0A CN113831457A (en) | 2021-09-26 | 2021-09-26 | Preparation method of supramolecular material for oil well sand prevention |
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| CN202111127463.0A CN113831457A (en) | 2021-09-26 | 2021-09-26 | Preparation method of supramolecular material for oil well sand prevention |
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Citations (5)
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| CN101235182A (en) * | 2008-01-21 | 2008-08-06 | 大庆石油学院 | Intramolecular Cr3+ cross-linked polymer gel and its preparation method |
| CN107057666A (en) * | 2017-05-03 | 2017-08-18 | 林林 | A kind of sand prevention integrated chemical agent of supermolecule oilwell water shutoff and preparation method thereof |
| CN110606909A (en) * | 2018-12-25 | 2019-12-24 | 北京石大博诚科技有限公司 | Flow pattern regulator copolymer for drilling fluid and preparation method thereof |
| CN111734374A (en) * | 2020-08-01 | 2020-10-02 | 西南石油大学 | Associative polymer combination oil displacement method for greatly improving heterogeneous oil reservoir recovery ratio |
| CN111978943A (en) * | 2020-09-07 | 2020-11-24 | 中国海洋石油集团有限公司 | Self-adaptive sand prevention and consolidation material |
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- 2021-09-26 CN CN202111127463.0A patent/CN113831457A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101235182A (en) * | 2008-01-21 | 2008-08-06 | 大庆石油学院 | Intramolecular Cr3+ cross-linked polymer gel and its preparation method |
| CN107057666A (en) * | 2017-05-03 | 2017-08-18 | 林林 | A kind of sand prevention integrated chemical agent of supermolecule oilwell water shutoff and preparation method thereof |
| CN110606909A (en) * | 2018-12-25 | 2019-12-24 | 北京石大博诚科技有限公司 | Flow pattern regulator copolymer for drilling fluid and preparation method thereof |
| CN111734374A (en) * | 2020-08-01 | 2020-10-02 | 西南石油大学 | Associative polymer combination oil displacement method for greatly improving heterogeneous oil reservoir recovery ratio |
| CN111978943A (en) * | 2020-09-07 | 2020-11-24 | 中国海洋石油集团有限公司 | Self-adaptive sand prevention and consolidation material |
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