According to the latest news from China National Offshore Oil Corporation, China's first high-temperature and high-pressure gas field, China National Offshore Oil Co., Ltd. Eastern 1-1 first adjustment wells, after successful drilling in the past 6 months, and create a series of leading international standards Job, safety and capacity records. As a symbol of this, CNOOC made breakthroughs in the "double high" gas accumulation theory, pre-monitoring of "double high" formation pressures, pre-drilling predictions, and post-drilling evaluations, and systematically overcame the exploration of offshore high-temperature and high-pressure gas fields. The world-class problem of development.
Xie Yuhong, director of the oil and gas administration bureau of the CNOOC South West China Sea, said that the pressure coefficient of the conventional gas field on the sea is around 1.0, and the pressure coefficient of the Dongfang 13 gas reservoir is between 1.8 and 2.1, and the bottomhole temperature is near 150°C. To use such a gas reservoir, there are two major problems: it is difficult to understand the reservoir, difficult to drill and completion, and other engineering techniques.
According to the relevant theory of some foreign experts, in the 90s of last century, Sino-foreign cooperative exploration of the Qiongqiong Basin had a pressure gradient and temperature so high that even if natural gas were developed, it would be a water-soluble gas and could not be free of accumulation. CNOOC initiated related theoretical research, innovated the theory of “double high†natural gas accumulation, constructed a gravity flow deposition model for tectonic movement type strike-slip basins and a “double high†formation pressure pre-monitoring technology, and proposed “dynamic anger— Hydrocarbon-forming-accumulation perspective of coupled hydrocarbon-forming and near-source accumulation; research and development of pressure predrilling, monitoring while drilling, and post-drilling evaluation technology that integrates high-temperature overpressure formations. These breakthroughs and breakthroughs in the drilling difficulties have shortened the exploration well drilling cycle from the first 200 days to about 40 days, and the cost has dropped dramatically. In the East, 13 Eastern Gas Fields were discovered, and in the Yacheng and Lingshui Districts, “double heights were discovered. "gas field.
The 1-1 adjustment of the wells in the East is precisely for the purpose of using these reserves. Through technological breakthroughs, compared with the design, the savings period is 121 days, the cost savings are 130 million yuan, and the actual output exceeds expectations. (Reporter Yu Jian)
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