Controllable cross-linked gel water plugging and leak plugging material for oil and gas field

Abstract

The invention relates to a controllable cross-linked gel water plugging and leak plugging material for an oil and gas field, which can plug cracked or solution-opened leak formation, and increase the gel strength. The technical scheme adopted by the invention is as follows: firstly adding acrylamide, chromium trichloride and N,N-methylene bisacrylamide to a beaker holding deionized water, after dissolving, adding an initiator, standing at room temperature for 1h to obtain gel, granulating, drying and screening to obtain solid particulates; adding Span-80 to cyclohexane to prepare an oil phase; dissolving acrylamide and N,N-methylene bisacrylamide in deionized water to prepare a water phase; adding the solid particulates to the water phase, uniformly mixing, then adding to the oil phase, sufficiently stirring, dropwise adding the initiator, reacting for 2h, adding a dispersant, filtering, washing and drying to obtain wrapping particles, wherein the wrapping particles can be wrapped again; and adding the particles to HPAM (hydrolyzed polyacrylamide) aqueous solution, and performing cross-linking reaction to obtain immobile gel. The production process of the material is strong in operability and low in cost; and the material has the characteristics of low filter loss, good airtightness and good stability.

Description

technical field [0001] The invention relates to a controllable cross-linked gel water plugging and leakage plugging material used in oil and gas fields. In particular, it involves the use of encapsulation technology to slowly release high-valent metal ions to cross-link polymer HPAM water and leakage plugging materials. Background technique [0002] Treatment of lost circulation is an important factor that increases drilling costs, and the time spent on it accounts for about 10% of the total drilling time. Since the treatment of fractured and karst caves accounts for more than 70% of the treatment time, for fractured and karst caves The traditional methods of plugging materials (such as bridge plugging, cement slurry plugging) have their own shortcomings when dealing with fractured and porous malignant leakage, and it is difficult to stay in the leaky layer around the wellbore. , easy to mix with formation fluid, and flow away after being diluted. Therefore, it is difficul...

AI Technical Summary

Problems solved by technology

[0002] Treatment of lost circulation is an important factor that increases drilling costs, and the time spent on it accounts for about 10% of the total drilling time. Since the treatment of fractured and karst caves accounts for more than 70% of the treatment time, for fractured and karst caves The traditional methods of plugging materials (such as bridge plugging, cement slurry plugging) have their own shortcomings when dealing with fractured and porous malignant leakage, and it is difficult to stay in the leaky layer around the wellbore. , easy to mix with formation fluid, and flow away after being diluted

Therefore, it is difficult for the plugging slurry to form a tight seal with sufficient strength around the inlet cylinder