A casing seal repair fluid

Abstract

The invention provides sealing repairing liquid for sleeve. The sealing repairing liquid for sleeve is prepared from the following components in parts by weight: 0.1-1 part of a thickening agent, 5-10 parts of an emulsifying agent, 10-35 parts of a flexible supporting agent, 5-30 parts of a rigid supporting agent, 1-10 parts of a suspending agent, 0.1-10 parts of a strength adjusting agent, 0.1-0.5 part of a stabilizer and 10-40 parts of water. The sealing repairing liquid has good flowing property and sealing capacity and can bear a high pressure of 110MPa, the performance can be adjusted along the temperature variation, the action time is controllable, and most importantly, the specific location of a leaking point of the sleeve does not need to be determined; the sealing repairing liquid can be used for blindly blocking a large well section and sealing the leaking point, and the construction process is simple.

Description

technical field [0001] The invention relates to the technical field of fracturing of oil and gas wells, in particular to a casing seal repair fluid used in the fracturing process of oil and gas wells, especially shale gas horizontal wells. Background technique [0002] Shale gas horizontal wells are completed by multi-stage and staged fracturing. In the process of reservoir fracturing, in order to achieve effective and safe formation fracturing, it is necessary for the casing to have a good and complete pressure bearing capacity. The casing requires a higher pressure bearing capacity, usually 70-110 MPa; in addition, the fracturing period required for staged fracturing is longer, generally lasting 7 to 10 days, which puts a higher pressure on the sealing pressure bearing capacity of the casing. higher requirements. [0003] During the transportation, loading and unloading of the casing or the casing operation, sometimes the casing thread and the sealing end face will be dam...

AI Technical Summary

Problems solved by technology

[0009] The plugging agents introduced in the above invention patents all have certain shortcomings and deficiencies: (1) The pressure bearing capacity after plugging the leakage is not clearly indicated; (2) The types of plugging leakage are all caused by the long-term development of the oil field For the leakage caused by casing corrosion, there is no plugging for the micro leakage of the casing before fracturing; (3) the types of leakage plugged are all large leakage channels, and there is no micro leakage; (4) the plugging mechanism is all Plugging material and fluid loss material form a filter cake and accumulate in large quantities to block the leakage channel