钻井过程中，为了防止泥页岩水化膨胀，减少钻井液滤失对油气层的损害，一般要在钻井液中加入页岩抑制剂和降滤失剂等，处理起来既复杂，成本又高，为解决这一难题，中原石油勘探局钻井工艺研究院最新研制了钻井用无荧光防塌降滤失剂KH－931。在优选钻井液配方的基础上，KH-931 In the drilling process, shale inhibitors and fluid loss additives are generally added to the drilling fluid in order to prevent hydration and expansion of shale and reduce the damage to the hydrocarbon reservoir caused by the fluid loss of the drilling fluid, which is complicated and costly to process , In order to solve this problem, the Central Plains Petroleum Exploration Bureau Drilling Technology Research Institute recently developed a non-fluorescent drilling fluid loss filter KH-931. On the basis of the preferred drilling fluid formulation, KH-931