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大牛地气田是是中国石油化工股份有限公司华北分公司开发地区之一,目前产能已建成年产量40亿立方米。该气田位于陕蒙交界地区,区块面积为2003.714km2,构造位置处于鄂尔多斯盆地伊陕斜坡东北部,储层分布特点是纵向上多层分布,自2005年开始投入规模开发,主要是以上古生界陆相沉积砂岩层和下古生界海相沉积的碳酸盐岩层为主,具有良好的天然气成藏条件,储层厚且面积大,资源丰富。气田主要产气储层物性表现为低孔、低渗。正是由于这种特点,导致直井开发产量低,经济效益差。因此,在大牛地区块水平井钻井技术的运用越来越广泛,产能越来越高;但对于钻井行业来讲,水平井施工所面对的技术难点仍有待改进。
Daniudi Gas Field is one of the development regions of North China Branch of China Petroleum & Chemical Corporation. At present, its annual production capacity has been completed with an annual output of 4 billion cubic meters. The gas field is located in the border area of Shaanxi and Mongolia with a block area of 2003.714km2. Its structural location is located in the northeast of the Yisang slope in the Ordos Basin. The reservoir is characterized by multi-layer vertical distribution. Since 2005, The continental facies sedimentary sandstone and the Lower Paleozoic marine sedimentary carbonate rocks are mainly characterized by good gas accumulation conditions, thick reservoirs and large areas with abundant resources. The main gas production in the gas field shows low porosity and low permeability. It is precisely because of this feature, leading to low vertical well productivity and poor economic efficiency. Therefore, block horizontal well drilling technology is more and more widely used in Daniu area, and the production capacity is getting higher and higher. However, for drilling industry, the technical difficulties in horizontal well construction need to be improved.