老井复查评价技术在低孔低渗油气藏中的研究应用

Application of Completed Well Reevaluation Technique in Low Permeability and Porosity Reservoir

徐进成 张社民 刘行万 陈明胜 段仁春

XU Jin-cheng ZHANG She-min LIU Xing-wan CHEN Ming-sheng DUAN Ren-chun

中石化 河南油田分公司 录井公司 研究所, 河南 南阳 473132; 石油大学, 北京 102249

Henan Oil Field Logging Company of SINOPEC, Nanyang 473132, China; University of Petroleum, Beijing 102249, China

低孔低渗油气藏在我国东部老区分布十分普遍,它具有孔隙度低、渗透率低、难识别、难开发等特点。在勘探开发初期,常被遗失。随着老区勘探开发的不断深入,加强对低孔低渗油气藏的研究、开发和利用具有更加重要的现实意义。老井复查就是对过去认为的"死井"、"低效无价值井"进行重新评价认识,实现重新利用的目的。它具有投资少、成本低、风险小、见效快等特点,是搞好老区挖潜增效、井位部署的重要途径之一。近年来,河南油田应用老井复查评价技术,相继在安棚、张店等低孔低渗地区均取得了重大突破,使昔日的"死井"、"低效井"均变成了"高产自喷井",取得了明显的社会效益和经济效益。该评价方法对低孔低渗油气藏的研究、开发,起到了很好的借鉴和指导作用

Reservoirs with low permeability and porosity are very common in the old exploration areas in East of the China. With low permeability, low porosity, they are hard to identify and exploit, thus are often lost at the initial stage of exploration. However, along with the gradual deepening exploration and exploitation in the old exploration regions, it has more important practical significance to strengthen the research, development and utilization of the reservoirs with low permeability and porosity. Tapping potential in the completed wells is to reevaluate and analyze the "dead wells" and "wells with low efficiency and no value", so that we can realize the purpose to make use of them once more. It has some characteristics such as small investment, low cost, small risk, quick efficiency, etc. It also has become one of the important methods to do well in tapping the potential and increasing the efficiency in the old regions and locating the wells. In recent years, the technologies of reevaluating and analyzing the completed wells have been applied in Henan Oil Field, and some important breakthroughs have been achieved in the low permeable and porous reservoirs such as Anpeng and Zhangdian oil fields. Some"dead wells" and "wells without efficiency" had turned out to be "gushing wells with high production". Magnificent social and economic benefit have been attained. The evaluation methods can play some reference and guidance roles in researching and developing the reservoirs with low permeability and porosity.