Solid-liquid separation is an important part of thedrilling waste treatmentprocess. The smaller the proportion of the water content in the waste, the smaller the volume of the remaining solids, and the smaller the required treatment cost, which can effectively control the treatment cost and reflect economic benefits. In recent years, domestically developed orifice plate filter presses, filter belt dewatering conveyors, horizontal screw centrifuges and other dewatering devices have promoted the improvement of drilling waste treatment technology.
This kind of treatment route is to let the sewage pond that collects wastes settle naturally first , and perform conventional sewage treatment on the free water produced after natural settlement; at the same time, add flocculants and coagulants to the sludge part for chemical destabilization treatment, and then pass it through dewatering devices such as centrifuges, filter belt dehydrators, orifice plate filter presses further separate solids and liquids, and finally solidify and treat the separated solids and moisture respectively, thereby completing the elimination of drilling and completion waste fluids. Harmful treatment. In this scheme, since the dehydration device is still in the trial stage, the degree of automation is not high and the efficiency is low.
Therefore, to improve efficiency, it is necessary to reduce from the source, and to simultaneously treat waste during the drilling process. After fully drawing on some advanced foreign experience, combined with the on-site situation of the drilling site in the country. KOSUN, a manufacturer of oil drilling equipment and solids control equipment, has formulated a comprehensivedrilling waste treatment solution for customers. The program starts from the source through four major steps of solids control equipment-dehydration/water treatment/water recycling/filtering-mud recovery-solidification/biodegradation/thermal analysis/drill cuttings reinjection.
Drilling waste mud is one of the main pollution sources in the oil and gas industry, and its waste treatment is currently a major problem that plagues oil fields. The oilfield drilling waste mud treatment process is to treat waste drilling mud (drill cuttings) immediately while drilling, meeting the requirement of “mud not landing”, reducing land use and environmental pollution.
Oilfield drilling waste mud treatment process is to change “end treatment” to “full process control”. The waste mud is diluted-flocculated-separated into three parts: rock cuttings, mud cake and water, and the solids in the mud are separated by washing and flocculation. With chemical reaction treatment, the cuttings and mud cakes can reach the discharge standard. After the harmful substances and chloride ions in the mud are separated into the water, they are then dehydrated by vacuum adsorption or extrusion to make mud cakes. At the same time, the mud cakes are separated by centrifugation. The wastewater is concentrated by air flotation sedimentation, filtration system, and reverse osmosis system. After treatment, the up-to-standard wastewater can be reused for drilling recycling.
The main equipment of oilfield drilling waste mud treatment process includes: drying shaker, drill cuttings dryer, drilling fluid centrifuge, screw conveyor, screw pump, etc. The KOSUN mud non-grounding system can effectively control the drilling cuttings in the drilling mud Water content (6%-10%), stable liquid phase performance, to achieve the purpose of mud drying treatment without falling to the ground.
There are many kinds of oilfield drilling waste mud treatment process in oilfield drilling. Each treatment plan needs to be determined according to the drilling site and drilling construction conditions. It must not only achieve the treatment effect, but also meet the national environmental protection requirements, and strive to achieve harmless treatment. It plays an active role in improving and protecting the environment, soil and groundwater.