Water and leakage plugging material of retarded crosslinking gel wrapping high valence metal ions

Abstract

The invention relates to a water and leakage plugging material of retarded crosslinking gel wrapping high valence metal ions, which can plug crack and cave leakage stratum, and the preparation of wrapped particles is easy to realize batch production. The technical scheme comprises the following steps: adding acrylamide, styrene, zirconium tetrachloride and N,N-methylenebisacrylamide into deionized water, adding initiator after dissolving, standing for 1hour at room temperature to obtain gel, pelleting, stoving and screening to obtain solid-phase particles; adding Span-80 into dimethylbenzene to prepare an oil phase; dissolving polyvinyl alcohol into deionized water to prepare an aqueous phase; adding the solid-phase particles into the aqueous phase, uniformly mixing, adding the mixture into the oil phase, fully stirring to form an inverse phase suspension, evaporating under 100-110 DEG C to remove water, filtering, washing and drying to obtain wrapped particles, and optionally wrapping again; adding the particles and stabilizer into an HPAM (hydrolyzed polyacryamide) aqueous solution to obtain fixed gel. The production of the material is easy to operate and is low cost, the time for gel forming is long, and the material has the characteristics of less filter loss, good leak tightness and good stability.

Description

technical field [0001] The invention relates to a water plugging and leakage plugging material which wraps high-valent metal ions and slowly cross-links gel, which can be applied to oil fields. First, the polymer network is used to bind high-valent metal ions, and then the reverse-phase suspension wrapping method is used to wrap high-valent metal ions. The double function achieves the purpose of slowly releasing high-valent metal ions, and a water plugging and leakage plugging material is obtained by cross-linking polymer HPAM. 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...

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