Hard compound reinforcing bridging agent

Abstract

The invention discloses a hard compound reinforcing bridging agent comprising the following materials in parts by weight: 30-40 parts of shell powder, 15-30 parts of calcium carbonate, 30-40 parts of natural hard rubber and 20-30 parts of natural hard fiber. A preparation method comprises the following step: uniformly mixing and stirring the materials in parts by weight at normal temperature and pressure. The hard compound reinforcing bridging agent is prepared by compounding elastic plugging materials with a certain rigidity according to a scientific mixing proportion, and rigid solid granules with different granule diameters enter leaking cracks, leaking pores and leaking passages in the plugging construction process and play bridging and supporting roles in the leaking cracks, the leaking pores and the leaking passages with different sizes. The invention has high supporting capability and plugging characteristic, wide using range, and the like and is widely applied to leakage prevention and plugging technologies of oil and geological exploration.

Description

1. Technical field [0001] The invention relates to a bridging agent for drilling leakage plugging, in particular to a hard composite reinforced bridging agent. 2. Background technology [0002] During the drilling process of oil exploration and development, lost circulation often occurs. Generally, walnut shells, mica, vermiculite, shells and other materials are used for plugging construction, which plays a role in drilling plugging construction, but it also has the following shortcomings and deficiencies : ① Due to the long lost well interval, there are soft mudstone lithology and limestone and carbonate hard lithology, therefore, it is impossible to select a plugging agent suitable for formation lithology characteristics as soon as possible after lost circulation occurs The performance of the plugging agent, the strength of the plugging agent, the particle size of the plugging agent, and the formula of the plugging agent have resulted in repeated plugging constructions; A...

AI Technical Summary

Problems solved by technology

[0002] During the drilling process of oil exploration and development, lost circulation often occurs. Generally, walnut shells, mica, vermiculite, shells and other materials are used for plugging construction, which plays a role in drilling plugging construction, but it also has the following shortcomings and deficiencies : ① Due to the long lost well interval, there are soft mudstone lithology and limestone and carbonate hard lithology, therefore, it is impossible to select a plugging agent suitable for formation lithology characteristics as soon as possible after lost circulation occurs The performance of the plugging agent, the strength of the plugging agent, the particle size of the plugging agent, and the formula of the plugging agent have resulted in repeated plugging constructions; Affect the drilling speed, and the plugging success rate is low; ③These bridging agents do not have sufficient compressive, tensile and shear strength, and some granular materials have high hardness, which does not match the lithology of the lost formation. Stress deformation changes its geometric shape and reduces the plugging effect, because the formation is broken due to the high hardness of the particles, which makes the formation repeatedly lost