呼图壁储气库老井封堵体系及封堵工艺研究与应用

Research and Application of Plugging Slurry and Plugging Technology in Old Well of Hutubi Gas Storage

覃栋优 刘江华 王 斌 雷先志

QIN Dongyou LIU Jianghua WANG Bin LEI Xianzhi

为获得适合呼图壁储气库老井可靠封堵的水泥浆体系和封堵工艺， 将研制的复合超细水泥浆体系和 G级微膨胀纤维水泥浆体系分别用于封堵老井产层和井筒， 评价了两种封堵体系的性能， 提出了分段挤堵、 逐次试压的老井封堵工艺。实验结果表明， 复合超细水泥浆体系的稳定性和注入性较好， 抗压强度达 16.6 MPa， 满足矿场封堵产层的要求； G级微膨胀纤维水泥浆体系流体阻隔性能和力学形变能力良好， 水泥石的渗透率较低、 饱和煤油突破压力较高、 壁面胶结强度高， 水泥石抗折强度高达 12.0 MPa， 满足矿场井筒封堵强度的要求。现场 2口典型井的成功封堵表明封堵水泥浆体系及封堵工艺切实可行， 满足呼图壁储气库老井的封堵要求。表 7参 18

In order to obtain the plugging slurry and plugging technology suitable for the old well in Hutubi gas storage，composite superfine cement slurry system and G level micro expansion fiber cement slurry system were used to plug the production layer and wellbore of old well separately. The performances of two plugging system were evaluated and the sectional extrusion and successive pressure test plugging technology of old well was put forward. The results showed that the composite superfine cement slurry system had good stability and injection ability，and the compressive strength reached 16.6 MPa，fully meeting the requirements of plugging production layer in field application. The G level micro expansion fiber cement slurry system had good fluid barrier property and mechanical deformation capacity. The cement stone had lower permeability，higher saturated kerosene breakthrough pressure and higher wall cementation intensity. The flexural strength of cement stone reached 12.0 MPa，meeting the requirements of plugging wellbore in field application. Two typical wells had been successfully plugged with the developed cement slurries and technology，demonstrating the feasibility of this technology.

10.19346/j.cnki.1000-4092.2016.04.015