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Home > KOSUN News >
KOSUN Shares How to Effectively Dispose of Drilling Waste?
Nov 16, 2021
Drilling waste or waste mud is one of the main pollution sources in the oil and gas industry. Due to engineering requirements, oil, water, organic clay and other substances are mixed in the oil drilling mud. In the past two years, drilling crews have used more and more oil-based mud, water-based mud and composite-based mud, and the accompanying cost increase and environmental pollution problems have become more and more serious.
The emergence of the mud zero-discharge treatment system has successfully solved the problem that drilling waste cannot be treated efficiently and environmentally. Different from the traditional method, the mud zero-discharge treatment system changes the waste mud from "end treatment" to "full process control". The waste mud is diluted-flocculated-separated into three parts: rock debris, mud cake and water. The solids in the mud are washed, flocculated and separated and chemically reacted to make the rock debris and mud cake meet the discharge standards. After the harmful components and chloride ions in the mud are separated into the water, they are dehydrated by vacuum adsorption or extrusion to make mud cakes. At the same time, the waste water separated by centrifugation is concentrated by air flotation sedimentation, filtration systems, and reverse osmosis systems. After treatment, the up-to-standard wastewater can be reused for drilling recycling.
The drilling waste treatment process is that the cuttings and other wastes separated from the drilling wastes can be reused as concrete base materials after a series of purification, drying, and recycling; the mud water produced by cleaning the cuttings is dosing. After destabilization, flocculation, and solid-liquid separation, a mud cake is formed, which can be blended with clay or shale in proportion to burn bricks. The separated filtrate water undergoes pretreatment processes such as destabilization, flocculation, air flotation, oxidation and adsorption filtration to remove major pollutants, and can be used for oilfield reinjection, refilling to safe formations or discharge up to standards; after the sewage is treated by the sewage treatment system, it can achieve up-to-standard emissions.
