阅读说明：本技术 一种高分子调堵剂及其制备方法和应用 (High-molecular profile control and plugging agent, and preparation method and application thereof ) 是由 徐明睿 商延兵 李洪波 于 2019-10-30 设计创作，主要内容包括：本发明公开了一种高分子调堵剂及其制备方法和应用,属于石油开采技术领域。该高分子调堵剂包括油相和水相,所述的油相包括白油、复合乳化剂；所述的水相包括丙烯酰胺、丙烯酸、二甲基烯丙基氯化铵、2-丙烯酰胺-2甲基丙磺酸、N,N-亚甲基双丙烯酰胺、引发剂、水。本发明实施例提供的一种高分子调堵剂,是以白油为分散介质,以及以丙烯酰胺、丙烯酸、阳离子单体二甲基烯丙基氯化铵、阴离子单体2-丙烯酰胺-2甲基丙磺酸为聚合物单体,以N,N-亚甲基双丙烯酰胺为交联剂,在氧化还原体系过硫酸铵-亚硫酸氢铵的引发作用下,利用反向微乳液聚合法制备而成,其制备成本低,具有优良的耐高温性、耐高压性能和封堵效果好。(The invention discloses a high-molecular plugging agent and a preparation method and application thereof, belonging to the technical field of oil exploitation. The high-molecular profile control agent comprises an oil phase and a water phase, wherein the oil phase comprises white oil and a composite emulsifier; the water phase comprises acrylamide, acrylic acid, dimethyl allyl ammonium chloride, 2-acrylamide-2-methyl propanesulfonic acid, N-methylene bisacrylamide, an initiator and water. The high-molecular plugging agent provided by the embodiment of the invention is prepared by taking white oil as a dispersion medium, acrylamide, acrylic acid, a cationic monomer, namely dimethyl allyl ammonium chloride, and an anionic monomer, namely 2-acrylamide-2-methylpropanesulfonic acid, as a polymer monomer, and N, N-methylene bisacrylamide as a cross-linking agent through a reverse microemulsion polymerization method under the initiation action of ammonium persulfate-ammonium bisulfite in a redox system, and has the advantages of low preparation cost, excellent high temperature resistance, high pressure resistance and good plugging effect.)

1. The high-molecular profile control agent is characterized by comprising an oil phase and a water phase, wherein the mass ratio of the oil phase to the water phase is (1 ~ 3):1, the oil phase comprises the following components, by weight, 40 ~ 70 parts of white oil and 8 ~ 18 parts of a composite emulsifier, and the water phase comprises the following components, by weight, 50 ~ 90 parts of acrylamide, 10 ~ 30 parts of acrylic acid, 3 ~ 8 parts of dimethyl allyl ammonium chloride, 5 ~ 15 parts of 2-acrylamide-2 methyl propane sulfonic acid, 0.5 ~ 2 parts of N, N-methylene bisacrylamide, 0.05 ~ 0.5.5 parts of an initiator and 300 ~ 500 parts of water.

2. The polymeric profile control agent according to claim 1, wherein the oil phase comprises 50 parts by weight of white oil 50 ~ 60 parts by weight, and 10 parts by weight of a complex emulsifier 10 ~ 15 parts by weight.

3. The polymeric profile control agent according to claim 1, wherein the aqueous phase comprises, by weight, 60 ~ 80 parts of acrylamide, 15 ~ 25 parts of acrylic acid, 4 ~ 6 parts of dimethylallylammonium chloride, 8 ~ 12 parts of 2-acrylamide-2-methylpropanesulfonic acid, 0.8 ~ 1.2.2 parts of N, N-methylenebisacrylamide, 0.1 ~ 0.2.2 parts of initiator, and 380 ~ 450 parts of water.

4. The high molecular weight profile control agent according to claim 1, wherein the mass ratio of the oil phase to the water phase is 2: 1.

5. The polymer profile control agent according to claim 1 or 2, wherein the compound emulsifier comprises span 80 and tween 80, and the mass ratio of span 80 to tween 80 is (1 ~ 2): 1.

6. A high molecular weight profile control agent according to claim 1 or 3, wherein the initiator comprises ammonium persulfate and ammonium bisulfite, and the mass ratio of the ammonium persulfate to the ammonium bisulfite is (1 ~ 2): (1 ~ 2).

7. A polymeric plugging agent according to claim 1, 3 or 4 wherein said aqueous phase has a pH of 6 ~ 8.

8. A method for preparing the polymeric plugging agent of claim 1 ~ 7, comprising the steps of:

weighing white oil, a composite emulsifier, acrylamide, acrylic acid, dimethyl allyl ammonium chloride, 2-acrylamide-2-methylpropanesulfonic acid, N-methylene bisacrylamide, an initiator and water according to the weight parts of the components for later use;

mixing the white oil and the compound emulsifier under the protection atmosphere and at the temperature of 40 ~ 60 ℃ to obtain an oil phase for later use;

adding the acrylamide, the acrylic acid, the dimethyl allyl ammonium chloride and the 2-acrylamide-2 methyl propanesulfonic acid into the water for dissolving to obtain a monomer solution;

adjusting the pH value of the monomer solution to 6 ~ 8, adding N, N-methylene bisacrylamide and an initiator, and mixing to obtain a water phase for later use;

and (3) according to the mass ratio of the oil phase to the water phase of (1 ~ 3):1, dropwise adding the water phase into the oil phase, and placing the mixture in a constant-temperature sealing environment at 40 ~ 60 ℃ for reaction to obtain the high-molecular plugging agent.

9. A high molecular weight plugging agent prepared according to the preparation method of claim 8.

10. Use of a polymeric profile control agent according to any one of claims 1 ~ 7 and 9 for use in the plugging of an oil reservoir.

Technical Field

The invention relates to the technical field of oil exploitation, in particular to a high-molecular plugging agent and a preparation method and application thereof.

Background

As petroleum development enters the middle and later stages, oil layer channeling sealing, profile control and plugging are developed into indispensable important measures, the oil layer channeling sealing and plugging are used for plugging a stratum perforated oil layer or an oil layer string layer, cement plugging, polymer plugging, high-strength resin plugging and the like are commonly used in field construction at present, and the technologies are widely applied in oil field development, but have the following problems: (1) the cement plugging has poor high temperature and high pressure resistance and poor plugging effect; (2) the polymer plugging agent is salt-sensitive, thermosensitive, multi-pseudo-ion flocculation and the like, so that the application range is limited; (3) the resin plugging is to use high-strength resin materials, namely phenolic resin, epoxy resin, urea resin and the like, and the curing is formed by adjusting the formula, so that an oil layer is plugged.

In addition, oil layer profile control is commonly used in oil fields at present as a chemical profile control agent, organogel and solid-phase particles are used for plugging a stratum string layer channel, the contradiction between the longitudinal direction and the transverse direction of an oil layer can be solved, but the chemical particles block a steam injection channel, so that the reservoir is easily damaged, major overhaul and other serious operation construction are easily caused, and a huge risk exists, so that the development of the profile control agent is urgently needed at present to provide oil layer plugging quality and reduce the operation cost.

Disclosure of Invention

The embodiment of the invention aims to provide a high-molecular profile control agent to solve the problems in the background technology.

In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:

a high-molecular profile control agent comprises an oil phase and a water phase, wherein the mass ratio of the oil phase to the water phase is (1-3) to 1; the oil phase comprises the following components in parts by weight: 40-70 parts of white oil and 8-18 parts of a composite emulsifier; the water phase comprises the following components in parts by weight: 50-90 parts of acrylamide, 10-30 parts of acrylic acid, 3-8 parts of dimethyl allyl ammonium chloride, 5-15 parts of 2-acrylamide-2-methyl propane sulfonic acid, 0.5-2 parts of N, N-methylene-bis-acrylamide, 0.05-0.5 part of an initiator and 300-500 parts of water.

Preferably, the oil phase comprises the following components in parts by weight: 50-60 parts of white oil and 10-15 parts of composite emulsifier.

Preferably, the water phase comprises the following components in parts by weight: 60-80 parts of acrylamide, 15-25 parts of acrylic acid, 4-6 parts of dimethyl allyl ammonium chloride, 8-12 parts of 2-acrylamide-2-methyl propanesulfonic acid, 0.8-1.2 parts of N, N-methylene-bis-acrylamide, 0.1-0.2 part of an initiator and 380-450 parts of water.

Preferably, the mass ratio of the oil phase to the water phase is 2: 1.

Preferably, the compound emulsifier comprises span 80 and tween 80; the mass ratio of span 80 to Tween 80 is (1-2) to 1.

Preferably, the initiator comprises ammonium persulfate and ammonium bisulfite; the mass ratio of the ammonium persulfate to the ammonium bisulfite is (1-2) to (1-2).

Preferably, the pH value of the water phase is 6-8.

Another object of an embodiment of the present invention is to provide a method for preparing the polymer plugging agent, which comprises the following steps:

weighing white oil, a composite emulsifier, acrylamide, acrylic acid, dimethyl allyl ammonium chloride, 2-acrylamide-2-methylpropanesulfonic acid, N-methylene bisacrylamide, an initiator and water according to the weight parts of the components for later use;

mixing the white oil and the composite emulsifier under a protective atmosphere at the temperature of 40-60 ℃ to obtain an oil phase for later use;

adding the acrylamide, the acrylic acid, the dimethyl allyl ammonium chloride and the 2-acrylamide-2 methyl propanesulfonic acid into the water for dissolving to obtain a monomer solution;

adjusting the pH value of the monomer solution to 6-8, adding N, N-methylene bisacrylamide and an initiator into the monomer solution, and mixing to obtain a water phase for later use;

and (3) dropwise adding the water phase into the oil phase according to the mass ratio of the oil phase to the water phase of (1-3): 1, and reacting in a constant-temperature sealed environment at 40-60 ℃ to obtain the high-molecular plugging agent.

The embodiment of the invention also aims to provide the high-molecular profile control and plugging agent prepared by the preparation method.

Another object of an embodiment of the present invention is to provide an application of the polymer plugging agent in oil layer plugging.

Compared with the prior art, the embodiment of the invention has the beneficial effects that:

the polymer plugging agent provided by the embodiment of the invention is prepared by taking white oil as a dispersion medium, span 80 and tween 80 as a composite emulsifier, and respectively taking acrylamide, acrylic acid, a cationic monomer, namely dimethyl allyl ammonium chloride, and an anionic monomer, namely 2-acrylamide-2-methylpropanesulfonic acid, as polymer monomers, taking N, N-methylene bisacrylamide as a cross-linking agent, and under the initiation action of ammonium persulfate-ammonium bisulfite in a redox system, by using a reverse microemulsion polymerization method, and has the advantages of low preparation cost, excellent high temperature resistance and excellent high pressure resistance. In addition, the high-molecular plugging agent can effectively plug oil layers, outer string layers and the like, has good plugging effect, has the plugging success rate of over 99.9 percent, and is convenient for large-scale popularization and use.

Drawings

FIG. 1 shows the consistency of the polymeric plugging agent provided in example 5 at 120 ℃ and 80 MPa.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.