磨溪雷一^1气藏高效开发主体技术与成效

The Agent Technologies for Efficient Development of Moxi Tl Gas Reservoir

针对磨溪雷一^1气藏中储层有效厚度薄、渗透性差、天然气含硫的问题,开展了精细气藏描述及井下管柱安全生产的相关研究。为确认磨溪雷一^1气藏的储层有效厚度及储层物性,采用了测井资料与地震信息结合方法,形成了建模-数值模拟一体化精细气藏描述技术,精确划分层段、识别储层甜点,形成了裸眼封隔器分段酸化储层改造技术、水平井开发结合井网优化技术等气藏高效开发技术。针对井下管柱腐蚀、堵塞严重的问题,对井下油管及玻璃钢油管进行寿命评价,采用了预防性更换油管,形成了修井延长井筒腐蚀气井开采期技术。基于上述技术的成功应用,为气藏实现持续25 a的稳产奠定了坚实的基础,为低渗碳酸盐岩气藏高效开发的典范,目前实现累计生产天然气110×10^8 m^3,取得了较好的开发效果。

In view of the problems of thin effective thickness,poor permeability and natural gas sulfur content in the Moxi T2 l11 gas reservoir,the related researches on the description of fine gas reservoirs and the safe production of downhole pipelines are carried out.In order to confirm the effective thickness and physical properties of reservoirs in Moxi T2 l11 gas reservoir,a combination of logging data and seismic information is adopted to form the integrated 3D geological modeling-reservoir simulation process.Accurate division of layers and identification of sweet spots in reservoirs have resulted in the development of high efficiency gas reservoir technology,such as open hole multistage acidizing technology,horizontal wells and well pattern optimization technology.In view of the serious corrosion and blockage of downhole pipes,the life evaluation of downhole tubing and FRP tubing has been carried out,and the preventive replacement of tubing has been adopted,formed the workover(to extent eroded wells life span)and surface system optimization technology.Development practice has indicated that T2 l11 gas reservoir maintains stable production of more than 25 years by successful application of efficient development technologies described above,setting an example as an efficiently developed low-permeability gas reservoir.This field has a gas production of 11 billion cubic meters,showing a good development effect.