东营北带深层砂砾岩体储层伤害机理研究

Damage mechanism of glutenite formation in north zone of Dongying depression

孙铭新

SUN Mingxin

胜利石油管理局钻井工艺研究院，山东东营　257017

Drilling Technology Research Institute of Shengli Petroleum Administration Bureau, Dongying 257017, China

东营北带广泛发育深层砂砾岩体，结构复杂，但对其储层伤害机理研究甚少。从孔渗关系、敏感性、液相伤害和固相伤害等方面出发，探讨了深层砂砾岩体储层伤害因素。研究发现，深层砂砾岩体储层属于低孔低渗储层，其产量与孔隙度大小没有直接关系；存在弱到中等水敏、弱碱敏和强应力敏感性；存在很强的液相伤害，水锁情况严重；固相伤害较为严重，且随着压差的增加而增强；该区块井漏事故较多，漏失量越大，对储层的伤害越严重；温度对其水敏性影响很大。研究结果可为研制适合该区块的钻完井液提供支撑。

Glutenite formations are distributed widely in the north zone of Dongying depression with complicated structures, but currently little formation damage mechanism is studied for glutenite formations. The damage factors were deeply researched to deep glutenite formations, from the aspects of porosity-permeability relation, sensitivity, liquid damage and solid damage. The results showed that the deep glutenite formation is with low porosity and low permeability, and the production was not directly related to porosity. And it was weak-middle water sensitive, weak alkali sensitive, and high stress sensitive. There were very strong liquid blocking, relatively severe solid plugging, which would become more serious with drilling pressure difference increasing. Many lost circulations occurred in the block, and the formation damage became more serious with leakage increasing. Reservoir temperature had a great impact on the water sensibility. The study could be a support for the development of drilling and completion liquid for the area.