High-density consolidation plugging agent

Abstract

The invention relates to a high-density consolidation-type leaking stoppage agent. The high-density consolidation-type leaking stoppage agent comprises the following components in parts by weight: 10 to 20 parts of calcium carbonate, 10 to 20 parts of calcium hydroxide, 2 to 6 parts of aluminum oxide, 6 to 10 parts of oil well cement, 40 to 60 parts of iron ore powder, 40 to 60 parts of barite, 3 to 6 parts of sulfonated sodium tannin SMT, 1 to 5 parts of solid polymeric alcohol lubricant, 0.2 to 1 part of acrylamide and sodium acrylate copolymer 80A-51, 0.2 to 1 part of potassium polyacrylamide K-PAM and 0.1 to 0.4 part of biopolymer XC. The preparation method of the high-density consolidation-type leaking stoppage agent comprises the following steps of sequentially adding the substances into a reaction kettle according to the weight ratio and content, stirring and mixing the components for 5 to 6 hours under the normal pressure and the temperature of 50 to 65 DEG C, adding the mixture into a drying device, crushing the mixture into solid powder product of 0.01mm to 0.3mm after the mixture is dried. The high-density consolidation-type leaking stoppage agent is high in density, good in mobility, coagulable, strong in leaking stoppage capacity, toxic-free, pollution-free, wide in raw material source, scientific and simple in process, safe in construction, widely applicable to petroleum and geological drilling process and particularly applicable to the high-pressure leaking stratum.

Description

technical field [0001] The invention relates to a drilling lost circulation agent, in particular to a high-density consolidation type lost circulation agent. Background technique [0002] In oil drilling, when drilling high-pressure lost formations, conventional plugging agents are generally used to increase the weight of spar powder for plugging, or high-density cement slurry is used for plugging, and bridging plugging agents are used for plugging. It has a certain effect, but at the same time there are the following shortcomings or deficiencies: ①It can meet the high density requirement after aggravation, but the fluidity is not good, the strength is low, and the coagulation is not good; the solid phase is high, the viscosity is high, the cycle pressure is high, and repeated leakage is easy to occur ; ②The high-density cement slurry has low viscosity and poor stagnation ability, and the volume is easy to shrink during plugging, and free water is easy to appear; ③The consum...

AI Technical Summary

Problems solved by technology

[0002] In oil drilling, when drilling high-pressure lost formations, conventional plugging agents are generally used to increase the weight of spar powder for plugging, or high-density cement slurry is used for plugging, and bridging plugging agents are used for plugging. It has a certain effect, but at the same time there are the following shortcomings or deficiencies: ①It can meet the high density requirement after aggravation, but the fluidity is not good, the strength is low, and the coagulation is not good; the solid phase is high, the viscosity is high, the cycle pressure is high, and repeated leakage is easy to occur ; ②The high-density cement slurry has low viscosity and poor stagnation ability, and the volume is easy to shrink during plugging, and free water is easy to appear; ③The consumption of plugging materials is large, and the plugging time is long; When a high-concentration bridging agent is added to the solid-phase plugging slurry, it is difficult for the plugging slurry to enter the depth of the high-pressure leakage fracture channel, and it is easy to seal; ④ The plugging slurry has poor coagulation and low strength, resulting in temporary plugging and repeated plugging Leakage, resulting in great economic losses, directly affects the plugging effect and drilling engineering