Plugging enhancer

Abstract

The invention discloses a leaking stoppage reinforcing agent which comprises the following components in parts by weight: 2-8 parts of urea resin, 1-5 parts of phenolic resin, 8-15 parts of slag, 1-5 parts of calcium sulfate, 5-8 parts of aluminum oxide, 3-6 parts of calcium chloride, 10-20 parts of calcium carbonate, 10-20 parts of silicon oxide, 0.1-0.4 part of polyanionic cellulose PAC-LV and 0.1-0.4 part of sodium carboxymethylcellulose CMC-LV. The leaking stoppage reinforcing agent is prepared by the steps of sequentially adding the components in parts by weight into a reaction kettle according to a conventional preparation method at 30-50 DEG C under normal pressure, stirring and mixing for 6-8 hours, subsequently adding the components into a kneading machine, uniformly mixing and stirring, drying, and crushing into a powder product with the particle size of 0.01-0.5mm. The leaking stoppage reinforcing agent has a remarkable leaking stoppage and reinforcing effect, is temperature resisting, good in stability and coagulability, high in structural stoppage capability and good in compatibility, can be thickened without solidification, is controllable in reinforcing time, wide in application range, safe in construction and free of toxicity or pollution, can be widely applied to petroleum and geological drilling process, and is particularly applicable to leaking stoppage construction in large cracks, large karst caves, underground rivers, severe deficit earth layers and crushed earth layers.

Description

technical field [0001] The invention relates to a drilling lost circulation agent, in particular to a lost circulation enhancing agent. Background technique [0002] The existing plugging agents used in oil drilling generally use calcium chloride, silicate (sodium silicate potassium silicate), steel balls, perlite, mosaic, calcium carbonate and other materials as plugging enhancers. In the formula of different types of lost circulation agents, in order to improve the strength of the lost circulation agents, although these lost circulation agents have played a role in oil drilling, they also have the following shortcomings or deficiencies: (1) Calcium chloride and silicate are risky, It is difficult to control the dosage of the plugging slurry, it is difficult to control the speed of increasing the strength of the plugging slurry, it is difficult to adjust the coagulation speed, and the construction risk is high. (2) The addition of inorganic salts to the formulation of the ...

AI Technical Summary

Problems solved by technology

[0002] The existing plugging agents used in oil drilling generally use calcium chloride, silicate (sodium silicate potassium silicate), steel balls, perlite, mosaic, calcium carbonate and other materials as plugging enhancers. In the formula of different types of lost circulation agents, in order to improve the strength of the lost circulation agents, although these lost circulation agents have played a role in oil drilling, they also have the following shortcomings or deficiencies: (1) Calcium chloride and silicate are risky, It is difficult to control the dosage of the plugging slurry, it is difficult to control the speed of increasing the strength of the plugging slurry, it is difficult to adjust the coagulation speed, and the construction risk is high

(2) The addition of inorganic salts to the lost circulation slurry formula has a great influence on the performance of the lost circulation slurry, resulting in rapid thickening, stratification, coagulation and precipitation, making the lost circulation slurry unstable

(3) Adding inert perlite, mosaic, calcium carbonate and other materials to the plugging slurry can improve the strength unevenly without coagulation, and the pump parts are easy to be damaged due to high hardness, resulting in continuous construction and long plugging time ;(4) It has a great impact on the pump parts, and in serious cases, it will complicate the downhole situation, so that the plugging slurry cannot be injected into the leaky layer, the drilling tool cannot be pulled out, and it solidifies in the well; (5) Single function, low strength, and poor adaptability , the use cost is high; (6) The plugging construction period is long, and the plugging in cracks and karst cave formations, the plugging rate is low due to the low strength of the plugging agent, the plugging effect is poor, and the construction cost is increased