Anti-high temperature consolidation plugging agent

Abstract

The invention discloses an anti-high temperature consolidation type plugging agent which consists of the following components in parts by weight: 30-40 parts of calcium carbonate, 3-5 parts of G-level oil well cement, 10-20 parts of high-temperature anti-salt clay, 0.5-3 parts of hydroxyethyl cellulose, 0.1-1 part of polyanionic cellulose, 0.5-3 parts of sulfonated tannin, 0.5-3 parts of sulfonated lignite and 1-5 parts of sulfonated phenolic resin SMP-2. The anti-high temperature consolidation type plugging agent is prepared by the following steps: sequentially adding the substances into a reaction kettle according to the components and content; stirring and mixing for 5-6 hours at 55-60 DEG C under normal pressure; adding the mixture into a dryer; and after the mixture is dried, grinding into 0.01-0.3mm powdery product. The anti-high temperature consolidation type plugging agent disclosed by the invention has the advantages of strong high-temperature resistance, good liquidity, high plugging rate, strong condensation performance, wide source of raw materials, scientific and simple process and safety in construction and is widely applied to the plugging projects of the absorption wells such as a high-temperature deep well and a geothermal exploitation well in petroleum and geological drilling.

Description

technical field [0001] The invention relates to a lost circulation plugging agent for well drilling, in particular to a high temperature resistant and solidified lost circulation plugging agent. Background technique [0002] When oil drilling encounters lost sections in high-temperature formations, because there is no high-temperature resistant plugging technology, conventional plugging agents are generally used for plugging. Although the conventional plugging method has played a role in the plugging project of oil drilling, it also has the following shortcomings or deficiencies: ① low high temperature resistance, short validity period, and poor plugging efficiency; ② high temperature is easy to degrade, and the plugging effect is poor; ③ The plugging material consumes a lot, and the plugging time is long; ④It has a certain effect on the plugging of medium and low temperature lost zones, but it cannot solve the problem of plugging in high-temperature deep wells and geotherma...

AI Technical Summary

Problems solved by technology

Although the conventional plugging method has played a role in the plugging project of oil drilling, it also has the following shortcomings or deficiencies: ① low high temperature resistance, short validity period, and poor plugging efficiency; ② high temperature is easy to degrade, and the plugging effect is poor; ③ The plugging material consumes a lot, and the plugging time is long; ④It has a certain effect on the plugging of medium and low temperature lost zones, but it cannot solve the problem of plugging in high-temperature deep wells and geothermal wells; ⑤Loop plugging in high-temperature deep wells and geothermal wells , the plugging safety factor is poor, prone to downhole complex situations, directly affecting the drilling and development process of high-temperature wells and geothermal wells