LD27-2油田稠油油藏蒸汽吞吐中后期注采参数优化研究

蒸汽吞吐是稠油油藏开发的最有效措施之一，但是对于海上油田的特殊条件，在进行蒸汽吞吐3~4轮后，即意味着进入蒸汽吞吐中后期。此时，如何调整注采参数，是海上稠油油藏高效开发的关键。针对LD27-2油田稠油油藏的开发特点，在地质建模和高度历史拟合的情况下，对LD27-2油田稠油油藏开发状况进行多轮次预测；基于生产历史拟合的油藏数值模型，开展了不同蒸汽干度、注汽强度、注汽强度递增等条件下A22H井和A23H井蒸汽吞吐至开采至10年的油藏数值模拟，明确不同注采参数的影响规律，优化了LD27-2油田稠油油藏蒸汽吞吐中后期注采参数。

Study on optimization of injection and production parameters in mid-to-late stage of cycle steam stimulation of heavy oil reservoirs in LD27-2 Oilfield

Cycle steam stimulation（CSS in short） is one of the most effective measures for the development of heavy oil reservoirs.However，for the special conditions of offshore oil fields，after 3 to 4 rounds of CSS，it means that it is in the middle and late stages of CSS.At this time，how to adjust the injection and production parameters is the key to the efficient development of offshore heavy oil reservoirs.This article aims at the development characteristics of heavy oil reservoirs in the LD27-2 Oilfield.Under the circumstances of geological modeling and high historical fitting，multiple rounds of predictions were made for the development status of heavy oil reservoirs in LD27-2 Oilfield.Finally，based on the reservoir numerical model fitted to the production history，numerical simulations of reservoirs with wells A22H and A23H CSS from production to 10 years under different conditions of steam dryness，steam injection intensity，and increasing steam injection intensity were carried out.The influence of production parameters on injection and production parameters of LD27-2 Oilfield heavy oil reservoirs during middle to late stage of CSS was optimized.