After drilling and completion of more than 20 oil Wells in Longdong main oil area of Changqing Oilfield, more than 8,000 tons of downhole cuttings generated from the production site were transported to the local Qingcheng brick making enterprise for secondary utilization to make sintered bricks, thus solving the problem of comprehensive treatment of drilling waste in oilfield development and realizing the safe and environmental protection resource utilization of water-based cuttings. This is only a microcosm of the industrial reapplication of oil and gas drilling cuttings to save energy and reduce consumption.
Effective utilization of solid waste resources is the best way to dispose drilling cuttings. In the early stage, since the “collection while drilling” treatment of drilling waste in Changqing Oilfield, the cost of outsourcing drilling cuttings is high, and the disposal occupies a lot of land, and there is a large safety and environmental protection risk. The relevant technicians selected nearly 100 oil and gas Wells in the whole oil and gas field according to different regions, formations and drilling fluid systems for sampling while drilling, and the test results all showed that water-based drilling cuttings were general industrial solid wastes. Researchers have carried out detailed analysis and testing of drilling cuttings, and innovated a variety of resource utilization ways such as paving of cuttings, paving well sites and making brick from cuttings, and improved the geotechnical properties of drilling cuttings, forming the drilling cuttings adding a certain proportion of lime and fly ash, which can meet the requirements of paving well sites and roadbed. By analyzing the characteristics of the cuttings, the additive formula of the cuttings free brick is overcome, which is based on ordinary Portland cement and supplemented by water-based epoxy resin. At the same time, the firing process of the cuttings, clay and coal gangue of the sintered brick is studied.
Changqing Oilfield has made a breakthrough in the non-landing disposal technology of rock cuttings to make the drilling site clean. The treatment process of “miscible collection + rubber breaking and destability + plate and frame press filtration” was established to achieve the maximum solid-liquid separation and the solid water content was less than 75%. To solve the problem of low pressure filtrate recovery rate after plate and frame filtration, in order to recycle liquid phase between Wells or well sites, an integrated treatment agent with a variety of mixtures was developed. The liquid phase recovery rate was greater than 65%, meeting the Class I industrial solid waste, solving the contradiction between mud non-landing process and drilling production, and fully realizing the transformation and upgrading from “in-situ curing” to “clean” treatment.
At present, the disposal and resource utilization technology of drilling cuttings in Changqing Oilfield has reached the industry standard in terms of pollution control, process design and operation management involved in the resource process of water-based drilling cuttings and liquid phase, and has realized the full coverage of safe and environmental protection disposal of drilling mud in Sulige, Yulin, Yan ‘an and other places in Changqing oil and gas area. It has obtained 5 invention patents, introduced 3 Changqing oilfield standards and 1 industry standard, further standardized the resource utilization of solid waste in oil and gas fields, reduced regional environmental risks, and turned waste into treasure after millions of square drilling cuttings and oily sludge treatment in oil fields.
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