水平井分段压裂在特低渗透油藏开发中的应用

摘要

Horizontal well fracturing technology has become a very effective exploitation technology in the low-permeability oil reservoir development, but the study about the thin layer of ultra-low permeability reservoir development is relatively limited. Taking a typical thin alternating layers of ultra-low permeability reservoir Fan 147 as an example, this article has studied the optimizing cracks of the horizontal wells, designed the reasonable parameters of the horizontal wells as well as the mixture well pattern of the horizontal well vertical well. The good horizontalwell fractured results in Fan 147 reservoir indicate that it's an essential way for the alternating thin layer of ultra-low permeability reservoir development by using the horizontal well fracturing technology.%基于樊147区块特低渗透低砂泥岩薄互层状油藏,通过数值模拟进行了水平井与直井联合注采井网的优化研究,确定采用反九点注采井网；通过渗流特征研究确定了分段压裂水平井的压力分布数学模型；通过水平井参数的优化研究确定了水平井的轨迹沿着主力油层中部.根据油藏高压异常的特点,采用井口带有防喷器的连续油管喷砂射孔、分段加砂压裂技术.根据实际效果分析,水平井分段压裂产能是相邻直井的3倍,稳定日产油15t左右,递减比直井慢,一口水平井投资是直井的两倍,因此提高了经济效益.体现了水平井分段压裂技术开发低丰度油藏的优势和前景.