重力泄水辅助蒸汽驱开发中后期油藏动用形态

Formation of Reservoir in Middle and Late Stage of Gravity Drainage Assisted Steam Flooding Development

辽河油田洼59块为巨厚块状砂岩稠油油藏,采用重力泄水辅助蒸汽驱开发目前已至中后期,大排量连续汽驱后,汽腔波及体积已达到最大,继续连续汽驱势必会发生严重汽窜.为明确重力泄水辅助蒸汽驱开发中后期油藏动用形态,确保合理开发稠油油藏,建立了稠油重力泄水辅助蒸汽驱数值模型,理论研究连续汽驱至中后期的压力、含油、含水、含汽饱和度场的分布,直观展示了油藏的动用形态特征.同时,基于油汽比及油藏的热损失综合考虑,提出后续开发的研究重点,应采用重力泄水辅助间歇汽驱,研究其生产过程中油藏的生产参数变化规律,实现对超稠油的高效开发.

The Block 59 in Liaohe Oilfield is a thick and massive sandstone heavy oil reservoir.The development of gravity flooding assisted steam flooding has been carried out in the middle and late stages.After large displacement continuous steam flooding,the volume of the steam chamber has reached the maximum and continues to be continuous.Steam driving is bound to cause serious steam.In order to clarify the development mode of reservoirs in the middle and late stages of gravity-discharge assisted steam flooding and ensure the rational development of heavy oil reservoirs,a numerical model for heavy oil gravity drainage assisted steam flooding is established in this paper.The theory studies the pressure and oil content of continuous steam flooding to the middle and late stages.The distribution of water and vapor saturation fields visually demonstrates the morphological characteristics of the reservoir.At the same time,based on the comprehensive consideration of oil-gas ratio and heat loss of the reservoir,the research focus of subsequent development should be proposed.Gravity drainage should be used to assist intermittent steam flooding,and the variation of production parameters of the reservoir during the production process should be studied to realize the super heavy oil.Efficient development.