阅读说明：本技术 一种油田用凝胶封堵剂及其制备方法 (Gel plugging agent for oil field and preparation method thereof ) 是由 乔东宇 叶仲斌 赖南君 王东栋 潘成巍 蒋茜 陈越美 于 2019-10-13 设计创作，主要内容包括：本发明公开了一种油田用凝胶封堵剂及其制备方法,属于石油钻井和采油工程领域。一种油田用凝胶封堵剂,包括下列重量份的原料：6～15份丙烯酰胺、2～8份丙烯酸、1～5份2-甲基-2-丙烯酰胺基丙磺酸、0.5～5份二甲基二烯丙基氯化铵、0.03～1份N,N′-亚甲基双丙烯酰胺、30～100份水、1.5～8份氢氧化钠和0.01～5份引发剂。一种油田用凝胶封堵剂的制备方法,包括下列步骤：S1.配制基液；S2.聚合反应。这种制备方法简单便捷,设备成本低,经济实惠,无三废产生,环保；所得封堵剂具有较强的封堵能力,可用于封堵不同尺寸的地层孔隙和裂缝,防止外来流体侵入地层,以达到保持井壁稳定和提高采收率的目的。(The invention discloses a gel plugging agent for an oil field and a preparation method thereof, belonging to the field of petroleum drilling and oil extraction engineering. The gel plugging agent for the oil field comprises the following raw materials in parts by weight: 6-15 parts of acrylamide, 2-8 parts of acrylic acid, 1-5 parts of 2-methyl-2-acrylamidopropanesulfonic acid, 0.5-5 parts of dimethyldiallylammonium chloride, 0.03-1 part of N, N' -methylenebisacrylamide, 30-100 parts of water, 1.5-8 parts of sodium hydroxide and 0.01-5 parts of an initiator. A preparation method of a gel plugging agent for oil fields comprises the following steps: s1, preparing base liquid; and S2, carrying out polymerization reaction. The preparation method is simple and convenient, low in equipment cost, economical and practical, free of three wastes and environment-friendly; the obtained plugging agent has strong plugging capability, can be used for plugging formation pores and cracks with different sizes, and prevents external fluid from invading the formation, so as to achieve the purposes of keeping the well wall stable and improving the recovery ratio.)

1. The gel plugging agent for the oil field is characterized by comprising the following raw materials in parts by weight: 6-15 parts of acrylamide, 2-8 parts of acrylic acid, 1-5 parts of 2-methyl-2-acrylamidopropanesulfonic acid, 0.5-5 parts of dimethyldiallylammonium chloride, 0.03-1 part of N, N' -methylenebisacrylamide, 30-100 parts of water, 1.5-8 parts of sodium hydroxide and 0.01-5 parts of an initiator.

2. The gel plugging agent for the oil field according to claim 1, which comprises the following raw materials in parts by weight: 6-15 parts of acrylamide, 2-6 parts of acrylic acid, 1-5 parts of 2-methyl-2-acrylamidopropanesulfonic acid, 0.5-2 parts of dimethyldiallylammonium chloride, 0.1-1 part of N, N' -methylenebisacrylamide, 30-100 parts of water, 1.5-6.6 parts of sodium hydroxide and 0.6-2 parts of an initiator.

3. The gel plugging agent for the oil field according to claim 1, which comprises the following raw materials in parts by weight: 15 parts of acrylamide, 6 parts of acrylic acid, 5 parts of 2-methyl-2-acrylamidopropanesulfonic acid, 2 parts of dimethyldiallylammonium chloride, 1 part of N, N' -methylenebisacrylamide, 100 parts of water, 6.6 parts of sodium hydroxide and 1 part of an initiator.

4. The oilfield gel blocking agent of claim 1, wherein the initiator is a mixture of ammonium persulfate and sodium bisulfite, a mixture of sodium metabisulfite and ammonium persulfate, or a mixture of sodium thiosulfate and potassium persulfate.

5. The oilfield gel plugging agent of claim 4, wherein the mixture comprises different components in a mass ratio of 1: 1.

6. The preparation method of the gel plugging agent for the oil field according to any one of claims 1 to 5, which comprises the following steps:

s1, preparing a base solution: adding water, acrylamide, acrylic acid, dimethyl diallyl ammonium chloride, N' -methylene bisacrylamide and 2-methyl-2-acrylamido propanesulfonic acid into a container according to the weight part to prepare an aqueous solution, and adding the sodium hydroxide in the weight part into the aqueous solution to control the pH value to be 8-9, so as to obtain a base solution;

s2, polymerization reaction: and slowly adding the initiator in parts by weight into the base solution, carrying out polymerization reaction for 3-5 hours, drying at a certain temperature, and sieving with a sieve of 80-120 meshes to obtain the product.

7. The method of claim 6, wherein the drying temperature is 105-120 ℃.

Technical Field

The invention belongs to the field of petroleum drilling and oil extraction engineering, and particularly relates to a gel plugging agent for an oil field and a preparation method thereof.

Background

The plugging agent for drilling fluid is a drilling fluid treating agent which is used for plugging formation pores and cracks and preventing drilling fluid and filtrate thereof from invading the formation so as to keep the well wall stable. In drilling, the plugging agent is reasonably used to prevent well wall collapse, prevent leakage and protect oil layer.

The plugging type anti-collapse agent widely used at present is mainly an asphalt product, the application of which greatly improves the anti-collapse capability of the drilling fluid, but the plugging type anti-collapse agent still has defects in practical application, such as limitation of a softening point, and easy influence of temperature in deep wells and ultra-deep wells so as to reduce the plugging effect.

Aiming at the defects of the existing plugging agent, the invention develops a gel plugging agent with stronger plugging capability.

Disclosure of Invention

Aiming at the problems, the invention provides the gel plugging agent for the oil field and the preparation method thereof, the preparation method is simple and convenient, and the prepared plugging agent has stronger plugging capability.

The technical scheme adopted by the invention is as follows:

the gel plugging agent for the oil field comprises the following raw materials in parts by weight: 6-15 parts of acrylamide, 2-8 parts of acrylic acid, 1-5 parts of 2-methyl-2-acrylamidopropanesulfonic acid, 0.5-5 parts of dimethyldiallylammonium chloride, 0.03-1 part of N, N' -methylenebisacrylamide, 30-100 parts of water, 1.5-8 parts of sodium hydroxide and 0.01-5 parts of an initiator.

Further, the gel plugging agent for the oil field comprises the following raw materials in parts by weight: 6-15 parts of acrylamide, 2-6 parts of acrylic acid, 1-5 parts of 2-methyl-2-acrylamidopropanesulfonic acid, 0.5-2 parts of dimethyldiallylammonium chloride, 0.1-1 part of N, N' -methylenebisacrylamide, 30-100 parts of water, 1.5-6.6 parts of sodium hydroxide and 0.6-2 parts of an initiator.

Further, the gel plugging agent for the oil field comprises the following raw materials in parts by weight: 15 parts of acrylamide, 6 parts of acrylic acid, 5 parts of 2-methyl-2-acrylamidopropanesulfonic acid, 2 parts of dimethyldiallylammonium chloride, 1 part of N, N' -methylenebisacrylamide, 100 parts of water, 6.6 parts of sodium hydroxide and 1 part of an initiator.

Further, the initiator is a mixture of ammonium persulfate and sodium bisulfite, a mixture of sodium metabisulfite and ammonium persulfate or a mixture of sodium thiosulfate and potassium persulfate.

Further, the mass ratio of the different components in the mixture is 1: 1.

Further, the preparation method of the gel plugging agent for the oil field comprises the following steps:

s1, preparing a base solution: adding water, acrylamide, acrylic acid, dimethyl diallyl ammonium chloride, N' -methylene bisacrylamide and 2-methyl-2-acrylamido propanesulfonic acid into a container according to the weight part to prepare an aqueous solution, and adding the sodium hydroxide in the weight part into the aqueous solution to control the pH value to be 8-9, so as to obtain a base solution;

s2, polymerization reaction: and slowly adding the initiator in parts by weight into the base solution, carrying out polymerization reaction for 3-5 hours, drying at a certain temperature, and sieving with a sieve of 80-120 meshes to obtain the product.

Further, the drying temperature is 105-120 ℃.

The invention has the beneficial effects that: the gel plugging agent for the oil field and the preparation method thereof have the advantages of simple and convenient preparation method, low equipment cost, economy, no generation of three wastes and environmental protection; the obtained plugging agent has strong plugging capability, can be used for plugging formation pores and cracks with different sizes, and prevents external fluid from invading the formation, so as to achieve the purposes of keeping the well wall stable and improving the recovery ratio.

Detailed Description

The embodiments of the present invention can be obtained by different substitutions in specific ranges based on the above technical solutions, and therefore, the following embodiments are only preferred embodiments of the embodiments, and any technical substitutions made by the above technical solutions are within the protection scope of the present invention.