Drilling fluid system for improving formation conditions as well as preparation method and application of drilling fluid system

Abstract

The invention provides a drilling fluid system for improving formation conditions and a preparation method thereof. The drilling fluid system contains a drilling fluid, inorganic micro-nano rigid particles A with spherical particle sizes of 1000-1400 meshes, inorganic micro-nano rigid particles B with spherical particle sizes of 1900-2800 meshes and polymer emulsified asphalt. The drilling fluid contains 100 parts by weight of water; and based on 100 parts by weight of water, the content of the inorganic micro-nano rigid particles A is 0.5-5 parts by weight, the content of the inorganic micro-nano rigid particles B is 0.5-5 parts by weight, and the content of the polymer emulsified asphalt is 1-10 parts by weight. A stable mud cake structure can be formed between a shaft and a stratum through the inorganic micro-nano rigid particles with the two different particle sizes and the macromolecular emulsified asphalt with the specific content, and then a stratum condition can be effectively improved.

Description

technical field

[0001] The invention relates to the technical field of treatment agents for drilling fluids, in particular to a drilling fluid system for improving formation conditions, a preparation method and application thereof. Background technique

[0002] In the process of drilling in deep formations, under the action of continuous high temperature, the thickening phenomenon of conventional drilling fluid is serious, the contradiction between rheology and fluid loss wall building is prominent, and it is easy to be polluted by salt, gypsum and calcium intrusion, which leads to the deterioration of drilling fluid performance , The maintenance process is complicated, and even a series of downhole complex situations are caused. Under normal circumstances, there are a large number of fractures in the collapsed formation. When drilling into the formation, the drilling fluid will quickly enter the formation along these fractures. At the same time, the mud shale will expand an...

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