摘要
渤海秦皇岛32-6油田是一个多油水系统稠油底水油藏,储层物性好,长期注水开发,造成油藏平面波及系数和纵向波及系数降低,注入水突进现象严重,注入水无效、低效循环加剧,严重影响水驱开发效果。传统的调剖只能封堵近井地带高渗条带,处理半径太小,储层不能得到有效开发。深部液流转向技术是以深部调剖为主,驱油效果为辅,将"调"和"驱"有机结合起来。通过深入油藏精细描述研究,开发出简捷、快速、准确、可靠的深部液流转向决策技术,为选井选层提供科学可靠的决策依据;同时根据孔道发育情况,研发出适应性强的深部转向剂封堵高渗透条带和挖潜中低渗透层剩余油;通过采用多段塞交替注入工艺实现了高渗调、堵,低渗解、驱、洗油的效果,达到了高效波及控制,提高了原油采收率的目的。通过该技术在秦皇岛32-6油田的应用,有效解决注入水突进和中、低渗剩余油挖潜困难的技术难题;证明该技术是可行的,增加了油井的产量,提高了经济效益,对今后渤海海上其他稠油油田的增产、挖潜具有指导和借鉴意义。
Bohai QHD32-60ilfield is heavy oil bottom-water reservoir of a multiple oil/water system, with good reservoir physical property. It has been waterflooding for a long time. As a result, the reservoir plane sweep coefficient and vertical sweep coefficient were reduced, injected water breakthrough was serious, injection water was invalid and inefficient circula- tion got fierce. All this exerted serious effect on waterflooding. Traditional profile control could only block high-permeability channel near wellbore area with small treatment radius, so reservoir development efficiency was low. Deep fluid flow divert- ing technology gives priority to deep profile control, taking the displacement effect as complementary and integrating ＂ con- trol＂ with ＂ flooding＂. Through in-depth research on fine reservoir description, we developed a simple, rapid, accurate, reliable and deep fluid flow steering technology, to provide scientific and reliable decision basis for well selection and layer selection. Meanwhile, according to the channel development status, we developed deep diverter of high adaptability to block high-permeability channel and tap potential of remaining oil in low-permeability formations. With the multi-block alterna- ting injection technology, we achieved the results of high- permeability profile control and plugging and low-permeability flooding and displacement, fulfilled high-efficiency sweep control, and enhanced crude oil recovery. After applying it to QHD 32-60ilfield, we solved the technical difficulties in injected water breakthrough and mid-low- permeability remaining oil potential tapping. It was proved that the technology was feasible, and it could increase the production of oil wells, improve the economic results, and be of significant guidance and reference to production increasing and potential tapping of other heavy oil oilfields in Bohai offshore area in future.
出处
《非常规油气》
2015年第5期38-44,共7页
Unconventional Oil & Gas
基金
中国海洋石油总公司"十二五"重大科技专项"海上在生产油气田挖潜增效技术研究"(CNOOC-KJ125ZDXM06LTD)部分成果
关键词
深部液流转向
波及系数
水驱
采收率
deep fluid flow diverting
sweep coefficient
waterflooding
recovery
