阅读说明：本技术 一种用于制备井下交联复合凝胶堵漏材料的组合物及其制备方法和凝胶 (Composition for preparing underground cross-linked composite gel plugging material, preparation method thereof and gel ) 是由 胡子乔 刘四海 刘金华 李大奇 张凤英 陈曾伟 王西江 于 2018-05-31 设计创作，主要内容包括：本发明涉及油田化学技术领域的一种用于制备井下交联复合凝胶堵漏材料的组合物及其制备方法和凝胶；所述用于制备井下交联复合凝胶堵漏材料的组合物,包含重量份数计的以下组分：水100份,阳离子烯基单体10～20份,阴离子烯基单体5～20份,玻璃纤维10～30份,交联剂0.01～1份,增粘剂0.5～5份,引发剂0.01～1份；使用本发明的组合物及方法,可提高凝胶本体强度,增强凝胶的抗压差驱动能力,强化凝胶对地层流体的阻隔以及对漏层的封堵。(The invention relates to a composition for preparing a downhole cross-linked composite gel plugging material, a preparation method thereof and gel, belonging to the technical field of oilfield chemistry; the composition for preparing the underground cross-linked composite gel plugging material comprises the following components in parts by weight: 100 parts of water, 10-20 parts of cationic alkenyl monomer, 5-20 parts of anionic alkenyl monomer, 10-30 parts of glass fiber, 0.01-1 part of cross-linking agent, 0.5-5 parts of tackifier and 0.01-1 part of initiator; by using the composition and the method, the strength of the gel body can be improved, the pressure difference resistant driving capability of the gel can be enhanced, and the obstruction of the gel to formation fluid and the plugging of a leakage layer can be strengthened.)

1. The composition for preparing the underground cross-linked composite gel plugging material comprises the following components in parts by weight:

2. The composition for preparing the downhole crosslinked composite gel plugging material according to claim 1, characterized by comprising the following components in parts by weight:

3. The composition for preparing a downhole crosslinked composite gel lost circulation material according to claim 1 or 2, wherein:

The cationic alkenyl monomer is selected from at least one of acryloyloxyethyltrimethyl ammonium chloride, methacryloyloxyethyltrimethylammonium chloride and dimethyldiallylammonium chloride.

4. The composition for preparing a downhole crosslinked composite gel lost circulation material according to claim 1 or 2, wherein:

The anionic alkenyl monomer is at least one of sodium styrene sulfonate, sodium methyl propylene sulfonate and sodium vinyl sulfonate.

5. The composition for preparing a downhole crosslinked composite gel lost circulation material according to claim 1 or 2, wherein:

the glass fiber is 100-400 meshes, and preferably 300-400 meshes.

6. the composition for preparing a downhole crosslinked composite gel lost circulation material according to claim 1 or 2, wherein:

The tackifier is selected from at least one of polyacrylamide, potassium polyacrylate and polyanionic cellulose.

7. the composition for preparing a downhole crosslinked composite gel lost circulation material according to claim 1 or 2, wherein:

the initiator is selected from at least one of ammonium persulfate, potassium persulfate, azodiisobutyl amidine hydrochloride, azodiisobutyl imidazoline salt, azoisobutyl formamide, tert-butyl hydroperoxide and cumene hydroperoxide;

The crosslinking agent is at least one selected from N, N' -methylene bisacrylamide, divinylbenzene and ethylene glycol dimethacrylate.

8. The preparation method of the composition for preparing the downhole crosslinked composite gel plugging material according to any one of claims 1 to 7, comprising the following steps:

Adding components including a cationic alkenyl monomer, an anionic alkenyl monomer, a cross-linking agent and an initiator into water, and stirring; adding the tackifier and stirring; adding glass fiber and stirring; and (5) obtaining the product.

9. A gel prepared from the composition for preparing a downhole cross-linked composite gel lost circulation material according to any one of claims 1 to 7.

10. The method for preparing the gel prepared from the composition for preparing the downhole crosslinked composite gel plugging material according to claim 9, wherein the gel is obtained by heating and reacting the composition, and the heating temperature is 30-120 ℃, and preferably 40-100 ℃.

Technical Field

The invention relates to the technical field of oilfield chemistry, in particular to a composition for preparing a downhole crosslinked composite gel plugging material, a preparation method thereof and gel.

Background

the lost circulation is a major engineering technical problem which troubles the petroleum exploration and development at home and abroad, especially the serious loss threatens the well drilling safety and greatly hinders the well drilling construction to continue. Generally, for malignant well leakage, conventional bridging plugging materials, high-water-loss plugging materials, inorganic gelling plugging agents, soft and hard plugging materials and the like are not enough to effectively respond.

In recent years, gel has received attention as a new plugging material. The gel is a semi-solid viscoelastic body, has a stable phase interface and strong anti-dilution capability; the deformability is good, the sealing agent can be widely suitable for pore throats or gaps with different sizes and shapes, and a good sealing effect is achieved on formation fluid; has better adhesion with the surface of the stratum, large flow resistance and good detention effect. Therefore, the gel has wide application prospect in drilling and plugging. However, the common gel has weak mechanical property, poor pressure resistance and fragility, and is difficult to independently meet the plugging requirement. The gel strength is improved, and the obstruction of the gel to formation fluid and the plugging of a leakage layer can be strengthened.

the literature (adv.funct.mater.energy-dispersive materials energy Reinforced Composites, 2017, 27, 1605350) discloses that sodium styrenesulfonate-acryloyloxyethyl trimethyl ammonium chloride ampholytic copolymer hydrogel is prepared by photoinitiation polymerization on the basis of glass Fiber braided fabric by taking glass Fiber braided fabric as a framework, and the gel strength is greatly improved compared with that of pure copolymer. However, if the gel system is applied in well plugging operations, there are some problems: (1) the size of the gel material prepared by the literature depends on the size of the fiber braided fabric, while the downhole crosslinked gel injected into the stratum is amorphous and huge in volume, and the fiber braided fabric capable of being matched does not exist; (2) in the literature, a fixing clamp is used for the fiber braided fabric, the braided fabric cannot be suspended in gel base fluid if the clamp is not used, and the fixing clamp cannot be used for downhole crosslinked gel injected into a stratum; (3) the photopolymerization method has no operability in well drilling plugging.

disclosure of Invention

In order to solve the problems in the prior art, the invention provides a composition for preparing an underground cross-linked composite gel plugging material and a preparation method thereof, and particularly relates to a composition for preparing an underground cross-linked composite gel plugging material, a preparation method thereof and gel. By using the composition and the method, the strength of the gel body can be improved, the pressure difference resistant driving capability of the gel can be enhanced, and the obstruction of the gel to formation fluid and the plugging of a leakage layer can be strengthened.

one of the purposes of the application is to provide a composition for preparing a downhole crosslinked composite gel plugging material, which comprises the following components in parts by weight:

Preferably, the composition for preparing the downhole crosslinked composite gel plugging material comprises the following components in parts by weight:

Wherein the content of the first and second substances,

The preferable proportion of the cationic alkenyl monomer is further 17-20 parts;

The anionic alkenyl monomer is further preferably 13 to 16 parts;

The crosslinking agent is further preferably 0.03 to 0.3 part, more preferably 0.06 to 0.12 part;

The initiator is further preferably 0.04-0.3 part, more preferably 0.06-0.12 part;

The glass fiber is more preferably 25 to 30 parts, depending on the actual condition.

the cationic alkenyl monomer may be selected from at least one of acryloyloxyethyltrimethyl ammonium chloride, methacryloyloxyethyltrimethyl ammonium chloride, and dimethyldiallylammonium chloride, and is preferably acryloyloxyethyltrimethyl ammonium chloride.

The anionic alkenyl monomer can be at least one selected from sodium styrene sulfonate, sodium methyl propylene sulfonate and sodium vinyl sulfonate, and sodium styrene sulfonate is preferred.

The glass fiber is 100-400 meshes, preferably 300-400 meshes, and specifically, E-glass fiber can be used; the fiber with the specification is beneficial to stable dispersion in a system. Glass fibers are generally used as common bridging lost circulation materials in the prior art, and are used for improving the strength of gel lost circulation materials in the application.

The crosslinking agent can be selected from at least one of N, N ' -methylenebisacrylamide, divinylbenzene and ethylene glycol dimethacrylate, preferably N, N ' -methylenebisacrylamide and divinylbenzene, and most preferably N, N ' -methylenebisacrylamide.

The tackifier can be selected from at least one of polyacrylamide, potassium polyacrylate and polyanionic cellulose, and the polyanionic cellulose is preferred.

The initiator can be selected from at least one of ammonium persulfate, potassium persulfate, azodiisobutyl amidine hydrochloride, azodiisobutyl imidazoline salt, azoisobutyl formamide, tert-butyl hydroperoxide and cumene hydroperoxide, and preferably at least one of ammonium persulfate, azodiisobutyl amidine hydrochloride, azoisobutyl formamide and tert-butyl hydroperoxide.

Wherein the cationic alkenyl monomer and the anionic alkenyl monomer exist simultaneously, so that the material has amphoteric characteristics; strength of the glass fiber reinforced material; the cross-linking agent is used for forming a material structure; the tackifier is used for suspending the glass fiber; the initiator is used to initiate polymerization of the monomers to form the gel material.

Another object of the present invention is to provide a method for preparing the composition for preparing a downhole crosslinked composite gel lost circulation material, which comprises the following steps:

Adding the components including the cationic alkenyl monomer, the anionic alkenyl monomer, the cross-linking agent, the initiator, the tackifier and the glass fiber into water, and uniformly stirring to obtain the water-based acrylic resin.

preferably, the method may comprise the steps of:

Adding components including a cationic alkenyl monomer, an anionic alkenyl monomer, a cross-linking agent and an initiator into water, and stirring; adding the tackifier and stirring; adding glass fiber and stirring; thus obtaining the composition.

The invention also aims to provide a gel prepared from the composition for preparing the downhole crosslinked composite gel plugging material. The gel is obtained by heating and reacting the composition, wherein the heating temperature range is 30-120 ℃, and the preferable temperature range is 40-100 ℃.

The downhole crosslinked composite gel prepared by the method can be used in the field of well drilling plugging, and is particularly suitable for vicious leakage plugging of petroleum drilling.

The invention obtains the high-strength gel by constructing an amphoteric copolymer-glass fiber composite network; in the gel, the introduced fine glass fiber and the densely charged polyampholyte enhance the interaction through ionic bonds, so that the gel strength is improved; the glass fiber is 100-400 meshes in size and large in specific surface area, and in addition, the gel base liquid contains the tackifier and has high system viscosity, so that the glass fiber can be suspended and uniformly dispersed in the gel base liquid; the composition can enter a leakage passage and react under the action of the formation temperature to form a high-strength gel slug, which is beneficial to improving the success rate of leakage plugging; and the preparation is easy, the economic applicability is realized, and the method is suitable for the construction of a drilling and leaking stoppage site.

Detailed Description

The present invention will be further described with reference to the following examples. However, the present invention is not limited to these examples.