Progress and prospect of high-efficient development technologies for Shengli beach-shallow sea oilfields

Shengli beach-shallow sea oilfields are located at the junction of sea and land， with Chengdao Oilfield and Xinbei Oilfield as representatives. They have the characteristics of diverse reservoir types， complex ground conditions， and significant investments in ocean engineering facilities， so it is difficult to develop beneficially. Based on the development practice of the Shengli beach-shallow sea oilfield， this paper focused on the technical achievements since the “11th Five-Year Plan.” The efficient development technologies for characteristic Shengli beach-shallow sea oilfields were formed through continuous technical research， with the cores of subdivision and comprehensive adjustment of beach-shallow sea oilfields， overall injection and production regulation of beach-shallow sea oilfields， efficient development of offshore oil production， effective utilization of beach-shallow sea marginal oilfield， and development of complex fractured buried hill oil reservoir. The first beach-shallow sea oilfield of four million tons， Chengdao Oilfield， was built in China， realizing the crossing from land to sea. The challenges in the efficient production construction in the new area and the technical support of enhanced oil recovery in the mature area were clarified by analyzing the problems facing the high-quality development of the beach-shallow sea oilfield. By considering the important position for the continuous production of Shengli Oilfield， the development direction of “fewer wells， high yield， high speed， and high efficiency” was proposed to alleviate the contradiction between the production demand and low grade of unproduced reserves， as well as the stable production foundation and restrictive liquid production in the mature area faced by the beach-shallow sea oilfield in the future. In other words， it is necessary to continue to study critical technologies， such as the beneficial utilization of multiple oil and gas reservoirs in beach-shallow sea， the reconstruction of secondary well pattern under the “3 + 2” development mode based on platform intensification， and the intelligent injection and production control based on a big model， to support the high-quality and sustainable development of Shengli beach-shallow sea oilfield.