CN-122012053-A - Front-end liquid for resin extrusion sealing liquid and preparation method thereof

CN122012053ACN 122012053 ACN122012053 ACN 122012053ACN-122012053-A

Abstract

The invention belongs to the technical field of oil field development and well cementation operation, and particularly relates to a pre-fluid for resin extrusion sealing fluid and a preparation method thereof. The pre-liquid comprises, by weight, 77-89 parts of water, 5-10 parts of an interface enhancer, 5-10 parts of an interface cleaning agent and 1-3 parts of a suspending agent. According to the invention, cement particles at the interface of the microcracks of the cement sheath are removed through the high molecular drag action of the suspension stabilizer, so that the influence of loose cement particles on the cementing of the resin extrusion sealing liquid and the microcrack interface is avoided, and compared with crude oil molecules, the interface cleaning liquid has stronger interface competitive adsorption capacity, so that the crude oil molecules are replaced to be anchored to the hydrophilic surface, and the interface crude oil removal effect is improved. Meanwhile, hydrophobic groups in the molecules can participate in the resin curing reaction, so that the interfacial bonding strength of the resin extrusion sealing liquid is improved. The interface reinforcing agent has a molecular bridge function, can form firm combination between a cement sheath microcrack (silicate inorganic interface) and resin extrusion sealing liquid (thermosetting resin), and improves the long-acting sealing property of the extrusion sealing liquid.

Inventors

TANG KAI
CHEN NING
CHEN XIAORONG
LIU XIAOLI
WANG WENBIN
WAN XIANGCHEN
ZHANG YIJIE
ZHANG JIAN
GAO GUOCHENG
YANG XIAOFENG

Assignees

中国石油天然气集团有限公司
中国石油集团川庆钻探工程有限公司

Dates

Publication Date: 20260512
Application Date: 20241111

Claims (9)

1. The pre-liquid for the resin extrusion sealing liquid is characterized by comprising the following components, by weight, 77-89 parts of water, 5-10 parts of an interface enhancer, 5-10 parts of an interface cleaning agent and 1-3 parts of a suspending agent.
2. The pre-liquid for resin extrusion sealing liquid of claim 1, wherein the interfacial enhancer is one or more of a mercaptosilane coupling agent, an aminosilane coupling agent, and a titanate coupling agent.
3. The pre-liquid for resin extrusion sealing liquid of claim 1, wherein the interfacial cleaner is one or both of sophorolipid and rhamnolipid.
4. The pre-liquid for resin extrusion sealing liquid according to claim 1, wherein the suspending agent is one or more of xanthan gum, carboxymethyl cellulose, hydroxyethyl cellulose and anionic polyacrylamide.
5. The pre-liquid for resin extrusion sealing liquid according to claim 2, wherein the mercaptosilane coupling agent is one or more of 3-mercaptopropyl methyl diethoxysilane, 3-mercaptopropyl methyl dimethoxysilane and 3-mercaptopropyl trimethoxysilane.
6. The pre-liquid for resin extrusion sealing liquid according to claim 2, wherein the aminosilane coupling agent is one or more of 3-aminopropyl methyl dimethoxy silane, 3-aminopropyl methyl diethoxy silane, 3-aminopropyl trimethoxy silane and N-2-aminoethyl-3-aminopropyl methyl diethoxy silane.
7. The pre-liquid for resin extrusion sealing liquid according to claim 2, wherein the titanate coupling agent is one or more of isopropyl tri (dioctyl pyrophosphoryloxy) titanate, isopropyl dioleoyl (dioctyl phosphate acyloxy) titanate and isopropyl trioleate acyloxy titanate.
8. The pre-liquid for resin extrusion sealing liquid as set forth in claim 4, wherein said carboxymethyl cellulose has a molecular weight of 3 to 7 tens of thousands, said hydroxyethyl cellulose has a molecular weight of 4 to 8 tens of thousands, and said anionic polyacrylamide has a molecular weight of 400 to 700 tens of thousands.
9. The method for preparing a pre-liquid for resin extrusion sealing liquid according to claim 1, which is characterized by comprising the following steps: step 1) adding the suspension with the formula amount into water with the formula amount while stirring, and stirring for 60-180min at the rotating speed of 300-400r/min to fully hydrate the suspension to obtain a suspension aqueous solution; And 2) adding the interfacial cleaning agent with the formula amount into the suspension aqueous solution, stirring for 30-60min at the rotating speed of 300-400r/min, then adding the interfacial enhancer with the formula amount, and stirring for 30-60min to obtain the composite material.

Description

Front-end liquid for resin extrusion sealing liquid and preparation method thereof Technical Field The invention belongs to the technical field of oil field development and well cementation operation, and particularly relates to a pre-fluid for resin extrusion sealing fluid and a preparation method thereof. Background In recent years, with increasing natural gas demand and continuous deep exploration and development work, underground geological conditions and well structures are also more and more complex, the problems of annulus pressure after well cementation or wellhead blowby are also more and more prominent, and most of treatment is carried out by adopting methods of regular detection, periodic pressure release, well repair, cement extrusion, resin extrusion and the like. Resin materials are increasingly favored because of their high compressive strength, good flexibility, and good extrudability without solid-phase microcracks. However, oil stains and formation water are often attached to the interfaces of the microcracks and the microcracks of the cement sheath, the cementing environment is poor, the cementing of the interfaces of the resin extrusion sealing liquid and the microcracks is seriously affected, the long-acting plugging property is difficult to ensure after measures are taken, and the requirement of long-term development of an annular zone well-killing can not be met. In order to solve the above problems, the current solutions have been mainly started from the aspect of optimizing the squeeze liquid properties. CN113930200a discloses a sealing agent for treating annular space with pressure, a preparation method and application thereof. The sealant comprises composite resin, a curing agent, a toughening agent and a viscosity reducer. The sealant is extruded into the oil-gas well annulus from the ground annulus and solidifies to seal the microcrack of the cement sheath, so that the oil-gas well annulus can be effectively sealed to solve the problem of casing sheath annular pressure. The method improves the micro-crack squeezing effect by optimizing the viscosity and the physical property of the cured resin sealant. However, the influence of the micro-crack interface cementing environment on the extrusion sealing effect under the downhole condition is not considered. Disclosure of Invention The invention aims to provide a pre-liquid for resin extrusion sealing liquid, which solves the problem of poor sealing long-acting property caused by poor cementing of an interface of the resin extrusion sealing liquid when an annulus is sealed under pressure. The invention also aims to provide a preparation method of the pre-liquid for the resin extrusion sealing liquid. Therefore, the technical scheme provided by the invention is as follows: the pre-liquid for resin extrusion sealing liquid comprises the following components, by weight, 77-89 parts of water, 5-10 parts of an interface reinforcing agent, 5-10 parts of an interface cleaning agent and 1-3 parts of a suspending agent. The interface enhancer is one or more of a sulfhydryl silane coupling agent, an amino silane coupling agent or a titanate coupling agent. The interface cleaning agent is one or two of sophorolipid and rhamnolipid. The suspending agent is one or more of xanthan gum, carboxymethyl cellulose, hydroxyethyl cellulose and anionic polyacrylamide. The sulfhydryl silane coupling agent is one or more of 3-mercaptopropyl methyl diethoxy silane, 3-mercaptopropyl methyl dimethoxy silane or 3-mercaptopropyl trimethoxy silane. The aminosilane coupling agent is one or more of 3-aminopropyl methyl dimethoxy silane, 3-aminopropyl methyl diethoxy silane, 3-aminopropyl trimethoxy silane and N-2-aminoethyl-3-aminopropyl methyl diethoxy silane. The titanate coupling agent is one or more of isopropyl tri (dioctyl pyrophosphoryloxy) titanate, isopropyl dioleate acyloxy (dioctyl phosphoric acyloxy) titanate and isopropyl trioleate acyloxy titanate. The molecular weight of the carboxymethyl cellulose is 3 ten thousand to 7 ten thousand, the molecular weight of the hydroxyethyl cellulose is 4 ten thousand to 8 ten thousand, and the molecular weight of the anionic polyacrylamide is 400 ten thousand to 700 ten thousand. The preparation method of the pre-liquid for the resin extrusion sealing liquid comprises the following steps: step 1) adding the suspension with the formula amount into water with the formula amount while stirring, and stirring for 60-180min at the rotating speed of 300-400r/min to fully hydrate the suspension to obtain a suspension aqueous solution; And 2) adding the interfacial cleaning agent with the formula amount into the suspension aqueous solution, stirring for 30-60min at the rotating speed of 300-400r/min, then adding the interfacial enhancer with the formula amount, and stirring for 30-60min to obtain the composite material. The beneficial effects of the invention are as follows: The pre-liquid for the resin extrusion sealing li