Squeezing cement plugging technical skill for thick oil absorption well

Abstract

The invention relates to the thick oil absorption well squeeze cementing leakage sealing process technology. The process technology performs the adjustment and controlling according to the pressure difference of the well head oil and the sleeve during the process of the squeeze cementing displacement, in addition, the leakage stoppage, the re-washing of liquid cement and the moving of a pipe column are inexistent during the whole construction process, and the nonpressurized cement curing is adopted. The invention has novel conception, and the adjustment and controlling is easy to be executed, because the invention adopts the leakage stoppage free, the liquid cement re-washing free and the pipe column moving free and the nonpressurized cement curing squeezing cementing methods to construct, the re-washing of the liquid cement, the moving of the pipe column can not be used and the well can be directly shut off to perform cement curing when the cement mortar displacement is positioned, thereby, the time of the squeezing cementation can be shortened, the working risk and the ground pollution are reduced, the invention is favor of saving the cost and shortening the well repairing time, the technology is suitable for the thick oil well layer sealing and the leakage seal, and is particularly effective to the leakage sealing and the strengthening of the outer cement mantle of a sleeve pipe.

Description

Technical field: [0001] The invention relates to a process technology for heavy oil well workover operation, which belongs to the category of oil workover operation technology. Background technique: [0002] During the workover operation of heavy oil leakage wells, cement must be squeezed into the leakage zone to block channeling before other operations can be performed. At present, there are two methods commonly used in heavy oil leakage wells to squeeze cement to seal channeling in oil workover operations: one is the plugging method, which uses a plugging agent to block the leakage channel and then squeezes cement. The second is the method of lowering the cement carrier, and the cement carrier is squeezed under the cement carrier to squeeze the cement slurry above the cement sealing layer. These cement-squeezing sealing channeling methods all need plugging and backwashing cement slurry operations and have the following problems: 1. When sealing channeling and strengthenin...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a heavy oil leakage well squeeze cement sealing channeling technology that can overcome the existing problems and shortcomings of the existing heavy oil leakage well cementing sealing channeling process

Images