Process for recycling oil-based mud and oil bases from oil-based mud drilling wastes

Abstract

The invention belongs to the treatment field of oil-based mud or oil-based drilling cuttings in the well drilling of shale gas, tight gas and conventional oil gas fields, and in particular relates to a treatment recycling process for synchronously recycling the oil-based mud and oil bases from oil-based mud drilling wastes. The treatment recycling process is characterized by comprising the following steps: performing centrifugal separation on the oil-based mud; recycling the oil-based mud in a deep desorption manner via reagents at a normal temperature; and performing mixed distillation on the reagents containing oil and recycling the condensed reagents. According to the reaction process, the harmless treatment of the oil-based mud or the oil-based drilling cuttings can be realized, wherein the content of the oil in a final solid-phase product is less than 1%; the majority of oil ingredients in the oil-based mud or the oil-based drilling cuttings can be recycled, wherein the recycling rate of the oil bases is greater than 90%. The adopted reaction reagents can be almost recycled for reutilization, wherein the loss of the reagents is less than 2%. In addition, the treatment procedures are all performed under a normal temperature and a normal pressure, so that the treatment time is short; the secondary pollution is nearly avoided. The treatment recycling process is low in equipment investment and operation cost. Thus, the treatment recycling process is obvious in environmental, social and economic benefits.

Description

technical field [0001] The invention belongs to the field of treatment of oil-based mud or oil-based drilling cuttings in shale gas, tight gas and conventional oil and gas field drilling, and in particular relates to a process for synchronously recovering oil-based mud from oil-based mud drilling waste and oil-based treatment and recovery. [0002] Background technique [0003] In the drilling engineering of salt layer, anhydrite layer, miscellaneous salt layer and high temperature deep well, oil-based mud is widely used. During the drilling process, waste drilling mud, mud tank bottom mud and cementing mud will be produced. Drilling waste. This kind of waste is a complex multiphase system containing mineral oil, phenolic compounds and heavy metals. The main pollutants come from the oil base of oil-based mud. Currently, commonly used drilling oil bases include diesel base, white oil base, bio-oil base, etc. base, mineral oil base, synthetic oil base, etc. Aromatic hydroca...

AI Technical Summary

Problems solved by technology

Traditionally, oil-based mud or drilling cuttings are treated by incineration, cracking, biodegradation, etc. However, the incineration method requires a large investment, high operating costs, and waste gas generated during the incineration process is likely to cause secondary environmental pollution; The oil-bearing drilling cuttings with a relatively low amount are disposed of by landfill. The landfill method requires less investment, but it does not really eliminate oil pollutants in the oil-bearing drilling cuttings. The rainy season and the penetration of groundwater may cause oil-based overflow. Polluted regional environment; biochemical method is also one of the commonly used methods at present. The cost of treating petroleum pollutants in oily drilling cuttings by microbial degradation is low, but the treatment cycle is long, and the aromatic hydrocarbons in the oil base have certain toxicity, which may inhibit the biochemical degradation process

This type of process treats the oil base in the waste oil base mud as waste, and does not realize the resource recovery of the oil base

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