Leakage plugging method for multi-layer casing damage section of oil well

Abstract

The invention discloses a leakage plugging method for a multi-layer casing damage section of an oil well. The leakage plugging method comprises the steps that a leakage point of each layer of casing damage section of a target well is determined; a preset position of the target well is filled with sand; composite drillable uniflow bridge plugs are lowered to the target leakage points of the targetwell; a plugging agent is injected into the target leakage points by using a casing horizontal pushing method; and all the target leakage points are plugged in sequence from bottom to top. According to a rapid and effective leakage plugging process for the multi-section casing damage of the oil-water well, the multi-section casing damage oil-water well can be rapidly plugged, the operation periodis shortened, and meanwhile, the plugging surface can be controlled through an underground tool, the resin plugging agent consumption is reduced, the operation material cost is reduced, the multi-section casing damage leakage plugging effective rate is improved, the differentiation phenomenon of the plugging agent for multi-section general leakage plugging is avoided, the plugging efficiency is guaranteed, and the measure success rate is remarkably increased.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and in particular relates to a leakage plugging method for multi-layer casing damage sections of oil wells. Background technique [0002] With the increase of production life of multi-reservoir oilfields, as well as the influence of geological conditions and engineering factors, casing damage and leakage of fluid outside the casing often occur, which affects the stable production of the oilfield and the smooth implementation of the development plan, and even causes production shutdown, seriously affecting the Effective water injection in reservoirs and enhancement of ultimate recovery. [0003] Currently, conventional leak plugging methods involve the following: [0004] (1) Chinese patent CN106014330A discloses a method for improving the success rate of chemical plugging of leaking casing damaged wells. The plugging material is to add quartz, calcite or marble particles to phosph...

AI Technical Summary

Problems solved by technology

[0004] (1) Chinese patent CN106014330A discloses a method for improving the success rate of chemical plugging of leaking casing damaged wells. The plugging material is to add quartz, calcite or marble particles to phosphate cement or aluminate cement, and use pre-cleaning , intermediate plugging and interval replacement methods to carry out large-scale leakage plugging, but the pressure test can only reach 15MPa, which cannot meet the plugging operation of old wells

[0005] (2) For multiple casing damage sections of the same well, plugging is often carried out one by one, but the general plugging operation will easily cause the plugging agent to only enter the casing damage section that is easier to enter, and other sections cannot be effectively sealed, so Multi-stage casing damage plugging leads to long operation cycle and short oil collection period

[0006] (3) Petroleum Drilling and Production Technology, 2012 Issue 02 "Research on Pipe Strings of Intubation Type Safety Plugging Technology" introduces the use of intubation type plugging strings. It can be injected with tubing but cannot be used for casing pushing process

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