Damage-free waste drilling fluid processing process

Abstract

The invention discloses a damage-free waste drilling fluid processing process, which comprises the following steps of: firstly drilling a wellhead by a drilling machine, and injecting wellhead slurry; passing a mixture of waste drilling fluid and the wellhead slurry through a vibration sieve to be filtered for obtaining rock debris, and meanwhile, feeding filter liquid into a desander; putting the obtained rock debris into a cleaner a, performing cleaning through externally injected clean water to obtain clean rock debris and medium-coarse sand, and meanwhile, merging the clean water a into circulation water; passing the filter liquid through the desander to obtain medium-fine sand; putting the obtained medium-fine sand into a cleaner b; using introduced clean water for cleaning to obtain clean sand; merging cleaning water b into the circulation water; and meanwhile, feeding the filter liquid obtained after passing through the desander into a desilter. The damage-free waste drilling fluid processing process has the advantages that through the principle, on the premise of not easily causing rock framework collapse due to clay mineral swelling and transportation, various different solid-phase particles in the waste drilling fluid can be processed; the circulation flowing use of the waste drilling fluid is ensured; and the condition that the fluid cannot reach a borehole from a flow storage layer is avoided.

Description

technical field [0001] The invention relates to the petroleum field, in particular to a non-damaging drilling waste liquid treatment process. Background technique [0002] The waste mud and cuttings produced by drilling operations are one of the main pollutants in the oil and gas industry, and their harmful treatment is a major problem that plagues oil fields at present. At present, domestic and foreign drilling waste fluid treatment technologies mainly include simple treatment and discharge, injection into safe formations or annular space on well wall, centralized treatment in different places, backfilling, sealing in pits, solidification, solid-liquid separation, incineration, microbial treatment, etc., among which the main ones are used The most important is curing treatment. And solidification treatment is terminal treatment, has following defect, the one is to treat drilling waste liquid with cement, fly ash, lime as matrix, adds new waste again under the situation tha...

AI Technical Summary

Problems solved by technology

[0003] The invention overcomes the deficiencies of the prior art, provides a non-damaging drilling waste fluid treatment process, and can treat various solids in the drilling waste fluid under the premise that it is not easy to cause the expansion and migration of clay minerals to cause the collapse of the rock skeleton. Phase particles are processed so that the density of the drilling waste fluid is not too high, ensuring the circulation of the drilling waste fluid and avoiding the situation that the fluid cannot pass from the reservoir to the wellbore

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