摘要
为了提高储气库废弃老井封堵的可靠性,开发出了两种不同功能的水泥浆体系。实验表明,G级微膨胀纤维水泥浆体系养护24 h线膨胀率为0.034%,体积不收缩;养护7 d抗冲击韧性比原浆水泥石提高45%;水泥石气测渗透率最高为0.0239×10-3μm2;模拟套管胶结壁面抗窜强度为2.3 MPa/cm,较原浆水泥石提高41%,具有较好的流体阻隔性能,适合于套管内部井筒的封堵。复合超细水泥浆体系浆体稳定性好,填砂管岩心实验最高注入压力为11 MPa,具有较强的穿透能力,封堵产层效果较好。
Two cement slurry systems have been developed to enhance reliability of abandoned well plugging in gas storage. Field tests show,Grade G micro- expansion fiber cement slurry system has linear expansion rate of0. 034% at curing time of 24 h. No shrinkage in volume has been observed. With curing time of 7 d,impact toughness can be 45% higher than that of original cement paste. Maximum gas permeability of the set cement is up to 0. 0239 × 10- 3μm2; Simulated casing pipe cementation strength against channeling is up to 2.3 MPa/cm,which is 41% higher than the original cement paste. The system displayed favorable fluid- retarding performances and can be used for plugging of internal barrel within the casing pipe. Composite ultra- fine cement slurry system displayed favorable stability. With maximum injection pressure of 11 MPa in sand- filling pipe,the system displayed favorable penetration capacity and plugging of reservoir formations.
出处
《新疆石油天然气》
CAS
2014年第3期26-29,5,共4页
Xinjiang Oil & Gas
关键词
储气库
废弃井
线膨胀率
抗冲击韧性
水泥石流体阻隔性能
Gas storage
Abandoned well
Linear expansion rate
Impact toughness
Fluid-retarding performances of set cement
