Study On High-temperature Water-based Waste Drilling Fluid

With the recent increase in drilling depth, high temperature water-based sulfonated polymer drilling fluid system get a large use in the ocean drilling. In order to anti-high temperature, the drilling fluid system use a large number of sulfonated products, the collid is very stable, high concentration of agent, toxic, high color, COD was high, as the follow-up treating of waste drilling fluid more difficult. With the national environmental laws, the protection of the marine environment is on the agenda. Offshore oil development, an urgent need to solve harmless waste drilling fluid disposal. So China National Offshore Oil Corporation on major research projects,"Drilling Waste Management Technology and Process" will be high-temperature water-based drilling fluid waste treatment technologies as important to carry out in-depth research.This paper analyzes the causes of stability of the high temperature water-based polysulfonate drilling fluid and mechanism of breaking plastic, forming a high resistance to high temperature drilling fluid polysulfonate break techniques. Optimization of the destruction of polymer cross-linked structure formed by gel-breaking antioxidants GLK-1 and GXPJ-3. Both breaker with synergies, the high temperature water-based drilling fluid waste gel breaking effect is remarkableThrough the mechanism of double-layer fluid and the chemical mechanism of bridging research and analysis together to form a waste slurry and efficient flocculation, coagulation. Optimized ferric chloride and polyacrylamide, and optimized high style coagulation equipment and water purification equipment. Drilling mud through the flocculation treatment after the gel break, and finally achieve a good solid-liquid separation.After the separation of the solid-liquid oil content of effluent,formed a highly efficient oil-water separating technique, developed a highly efficient degreasers CY-16, and optimized high flotation oil removal equipment, waste oil removal rate more than 95%.By chemical oxidation, decolorization mechanism analysis, the formation of a drilling mud bleaching technology. Optimized effective decolorization and COD of the oxidant additionBy adsorption filtration efficiency of filter medium, the successful production of activated carbon and KDF electrochemical metal material as the fine filter cartridge column. Formed a set of further decolorization of wastewater COD reduction technologyBreaking through the plastic efficiency, flocculation, solid-liquid separation, degreasing, oxidation, adsorption, filtration technology and related equipment such as research, and forming a high temperature waste water base drilling fluid polysulfonate solid-liquid separation treatment process, wastewater treatment is a colorless, COD from about 35956mg / L down to 367.6mg / L, oil content≤50mg / L, pH of 7 to 8, SS≤200mg / L, to achieve the assessment Index. It provides technical support for marine environmental protection and waste mud polysulfonate harmless disposal.