Coagulation composite sealing agent

Abstract

The invention discloses a coagulation composite sealing agent, which comprises components in percentage by weight: sodium silicate 3-6, potassium silicate 2-4, magnesium oxide 10-20, calcium carbonate 20-30, shell powder 15-30 and calcium oxide 5-10, which are evenly mixed and stirred under normal temperature and pressure. The invention is characterized by repairing and coagulating fractures, not bearing the pressure of leakage stratum well walls, being capable of freely pumping, forming concretion substances coagulated on easy broken well walls of leakage channels and leakage fractures and the like. The sealing agent is extensively applicable to petroleum and geology boring projects, in particular to application in bearing and leak-stopping processes of low-voltage brokenness stratums, reef limestone stratums and fracture stratums.

Description

1. Technical field [0001] The invention relates to a drilling plugging agent, in particular to a coagulation type composite plugging agent. 2. Background technology [0002] The treatment of lost circulation is a major technical problem in oil drilling, especially the problem of lost circulation in complex wells is particularly difficult. Conventional plugging agents are generally chemical gel plugging methods such as bridge slurry plugging, bridge plugging, and diesel bentonite slurry plugging. Although they also play a certain role, they have the following shortcomings or deficiencies: ①During the plugging construction, it is impossible to Condensation repairs the borehole wall of the lost formation. ②For broken formations, which are prone to collapse and lost circulation, especially for formations with poor cementation at low pressure, the borehole wall of the broken formation cannot be repaired and condensed; Plugging, thus directly reducing the pressure-bearing pluggi...

AI Technical Summary

Problems solved by technology

Conventional plugging agents are generally chemical gel plugging methods such as bridge slurry plugging, bridge plugging, and diesel bentonite slurry plugging. Although they also play a certain role, they have the following shortcomings or deficiencies: ①During the plugging construction, it is impossible to Condensation Repairing the Borehole Wall of Leaky Formation

②For broken formations, which are prone to collapse and lost circulation, especially for formations with poor cementation at low pressure, the borehole wall of the broken formation cannot be repaired and condensed; plugging, thus directly reducing the pressure-bearing plugging effect of the broken formation, so as to affect the follow-up operation process and oil production