低渗透气田试验井区开发效果评价

Evaluation on exploitation effect of test well group in low permeability gas field

苏里格气田苏10区块山1、盒8气藏为典型的低孔、低渗、低丰度、非均质性强的岩性气藏。充分利用了气藏动、静态资料,对该区块中北部基础井网较完善的苏10-34-32井区进行了生产特征研究、开发效果评价,为气藏下步合理开发提供技术指导。研究结果表明:气井目前处于降压稳产阶段,符合苏里格低渗气田的生产特点;气井合理产量为1.0～1.5×104m3·d-1;井口压力与时间的半对数呈直线关系、压降速率与时间呈指数关系;井间未出现干扰现象,600m×1200m井网具备加密的物质基础和经济效益。

The gas layers of Shanl and He8 in Block Su10 of Sulige Gas Field are typical lithologic gas fields with low porosity, low permeability, low reserves abundance and strong heterogeneity. Taking Sn10-34-32 welt group as an example, which is a basic improved well pattern at the north section of Block Su10, characteristics of production and development evaluation have carried out by taking full advantage of the static and dynamic data. The research has provided the technological guidance for rational exploitation of gas field. According to the result of the research, the gas wells are at the pressure release and stable production stage now, which is in accordance with the production features of Sulige low porosity gas field. An individual reasonable production is 1× 10^4 to 1.5 ×10^4 m^3/d. Wellhead pressure and time logarithm is in linear relationship and pressure drop rate is exponential taper. There is no interference between wells and it has material foundation and certain economic benefits when infill drilling is carried out in 600 m×1,200 m well network.