Anti-leakage drilling fluid material and use method thereof

Abstract

The invention discloses an anti-leakage drilling fluid material and a use method thereof. The anti-leakage drilling fluid material is prepared from, by weight, 100 parts of drilling fluid, 1-3 parts of a flexible agent, 4-6 parts of an anti-leakage agent and 2-8 parts of a reinforcing agent, and the anti-leakage agent is prepared from elastic graphite, a fiber material, oil-soluble resin, a porous material, calcium carbonate, quartz sand, core-shell particles and plant shell particles; the reinforcing agent is plastic particles with the average particle size of 800-1500 [mu] m, and has at least three forms of a spheroid, a regular tetrahedron, a regular octahedron and a regular dodecahedron. Through the synergistic effect of the flexible agent, the anti-leakage agent and the reinforcing agent, the continuous reinforcing process of active defense, active reinforcement and forced reinforcement is achieved in the drilling process, high pressure resistance and high shear resistance are achieved, and the leakage situation in the deep drilling process is effectively avoided.

Description

technical field [0001] The invention relates to the field of oilfield drilling fluid technology, and more specifically, to a leakage prevention drilling fluid material and a method for using the same. Background technique [0002] With the development of land and offshore oil and gas resources shifting from shallow layers to deep layers above 5,000 m, super-layer drilling fluid technology over 5,000 m has also developed rapidly. At the same time, the problem of lost circulation in the process of deep drilling also appears thereupon. Compared with shallow drilling, due to the influence of high temperature and high pressure in deep drilling, lost circulation occurs more frequently, and the number of repeated lost circulation is high, which greatly affects drilling efficiency. The anti-leakage method used for shallow drilling is difficult to apply to deep drilling. [0003] Existing leakage prevention methods mainly include two methods: (1) ordinary drilling fluid cooperates ...

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Problems solved by technology

[0005] In order to overcome the defect of poor leakage prevention effect of deep drilling described in the above-mentioned prior art, the present invention provides a leakage prevention drilling fluid material. The active defense-active strengthening-forced strengthening continuous strengthening process is realized in the drilling process, with high compressive and high shearing resistance, which effectively avoids leakage in the deep drilling process.