A chemical plugging process for casing damaged wells without bridging plugs and non-moving strings

Abstract

The invention provides a chemical plugging process for a bridge-free non-moving pipe string casing damaged well, which uses guar gum base liquid to occupy the production layer and uses the density difference and wettability of organic resin, guar gum, and water to pass The injection of suspended organic resin replaces the mechanical bridge plug, and at the same time, the plugging agent is injected for casing damaged wells with high water absorption without moving the string, so as to complete the chemical plugging of casing damaged wells in one trip. The bridge plug-free chemical plugging process for casing damaged wells without bridge plugs reduces the cost, avoids the cost and time wasted in multiple bridge plugging, and avoids the failure of multiple sets of mechanical bridge plugs to damage the inner wall of fragile casings in old wells. Secondary losses and the acceleration of inner wall corrosion. The labor intensity in the construction process is greatly reduced. Since there is no plugging agent in the pipe string, the risk of "flag pole" caused by plugging operations is greatly reduced, and the time for chemical plugging operations is greatly reduced.

Description

technical field

[0001] The invention belongs to the technical field of petroleum exploitation, and in particular relates to a chemical plugging process for casing damaged wells without bridging plugs and fixed pipe strings. Background technique

[0002] With the increase of the production life of multi-layer oilfields, coupled with the influence of geological conditions and engineering factors, casing damage and fluid leakage outside the casing often occur, affecting the stable production of the oilfield and the smooth implementation of the development plan, and even causing production shutdown, seriously affecting It improves the effective water injection and ultimate recovery of the reservoir. At present, the commonly used channeling and leakage sealing technology mainly uses cement, resin, organic materials, etc. for chemical sealing. Most of the mechanical bridge plugs are used to seal off the production layer. The tool tubing replaces the plugging agent to the vicinity...

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