摘要
地层承压能力是地层结构完整性和强度、工作液性质及其二者相互作用的综合反映。分析了影响地层承压能力的地质和工程因素,并从物理、化学、力学的角度讨论了提高地层承压能力的方法,评述了各种方法在不同作业中的适用性,举例说明了典型方法的成功应用。研究指出,强化井周应力和提高裂缝延伸压力是强化地层承压能力的主要途径,维持裂缝系统稳定性是地层强化后承压能力持续有效的必要保证。建议开展多尺度结构地层承压能力评价方法及预测理论研究,研制高性能封堵材料,大幅度提高岩体结构强度。
The formation pressure-bearing capacity is the comprehensive reflection of structural integrity and strength of formation,working fluid property and the interaction between formation and working fluid.This paper analyzed the geological and engineering factors affecting the pressure-bearing capacity,discussed the enhancing methods from physics,chemistry and mechanics point of views and their applicability in different cases.Successful cases were given in this paper,and the research results showed that increasing hoop stress and fracture propagation pressure are the major ways to enhance pressure-bearing capacity.It is essential to maintain the stability of the fracture system to guarantee the validity of the enhancement.It is suggested that more work should be done on the evaluation and prediction of formation pressure-bearing capacity of multi-scale structure,and attention should be paid on the development of high performance materials to greatly enhance the rock mass structural strength.
出处
《钻井液与完井液》
CAS
2011年第5期81-85,88,共6页
Drilling Fluid & Completion Fluid
基金
973计划课题(2010CB226705)
国家科技重大专项(2008ZX05049-003-03
2008ZX05005-006-08HZ)
关键词
地层承压
周向应力
裂缝延伸压力
裂缝稳定性
Formation pressure-bearing capacity
Hoop stress
Fracture propagation pressure
Fracture stability
