High-strength consolidation plugging agent

Abstract

The invention discloses a high-strength consolidation lost circulation additive, which consists of the following components in parts by weight: 20-40 parts of calcium carbonate, 5-10 parts of silicon dioxide, 1-4 parts of calcium chloride, 0.1-0.4 part of polyanionic cellulose, 0.1-0.2 part of an XC biopolymer, 5-10 parts of aluminum oxide, 3-8 parts of magnesium oxide and 10-16 parts of oil well cement. The lost circulation additive is prepared by carrying out the following steps: adding the components into a kneading machine based on the parts by weight at normal temperature and under normal pressure according to the conventional preparation method; mixing and stirring uniformly; drying; smashing into a powdery product being 0.01-0.2 millimeter in particle size. The high-strength consolidation lost circulation additive has the characteristics of wide raw material source, high strength, strong suspending power, high mobility, high pumpability, condensing and plugging capabilities, high minimum inflation performance, high solubility, high leakage plugging success rate, simple process and safety in construction, is widely applied to petroleum and geological drilling processes, and is particularly to be applied to fractured hard formations and karst cave formations.

Description

technical field [0001] The invention relates to a drilling lost circulation agent, in particular to a high-strength consolidation type lost circulation agent. Background technique [0002] An existing plugging agent with a certain strength used in oil drilling is fast-setting cement. Its formula is: 100 parts of oil well cement, 40-50 parts of water, and 5-30 parts of coagulant. It is a plugging process for oil drilling. It has played a role, but it also has the following shortcomings or deficiencies: ①It is difficult to control the thickening time, setting time and pumpable time, and it is easy to cause rapid loss or rapid curing of cement slurry, and it is difficult to guarantee construction safety; ②The density of cement slurry is high , easy to leak formation, poor stagnation ability; ③ low viscosity, not easy to stagnate in the leakage channel, easy to come out of water after solidification, poor plugging ability; ④ solidification time and solidification strength are un...

AI Technical Summary

Problems solved by technology

[0002] An existing plugging agent with a certain strength used in oil drilling is fast-setting cement. Its formula is: 100 parts of oil well cement, 40-50 parts of water, and 5-30 parts of coagulant. It is a plugging process for oil drilling. It has played a role, but it also has the following shortcomings or deficiencies: ①It is difficult to control the thickening time, setting time and pumpable time, and it is easy to cause rapid loss or rapid curing of cement slurry, and it is difficult to guarantee construction safety; ②The density of cement slurry is high , easy to leak formation, poor stagnation ability; ③ low viscosity, not easy to stagnate in the leakage channel, easy to come out of water after solidification, poor plugging ability; ④ solidification time and solidification strength are uncontrollable; The plug at the bottom of the well is very hard, it takes a long time to drill the plug, and it is easy to produce a new hole, or new leakage occurs after the plug is drilled, which is prone to repeated plugging, resulting in increased costs