候凝

评价结果表明。调整后的低密早强剂G203（A）与其他添加剂配伍性好，能够提高早期强度缩短候凝时间，固井成本低。

Test results showed G203 ( A ) had good compatibility with other cement additives , the thickening time of the slurry with G203 ( A ) in was shorted , and the early strength of cement stone was improved .

水泥候凝时间及其影响因素的试验研究

Experimental Study of Influencing Factors of Cement Curing Time

该体系由短候凝尾浆和缓凝领浆两部分组成。

It is composed of a short WOC tail slurry and a retarded pilot slurry .

动态水对候凝水泥浆的影响

Effect of Dynamic Water on Waiting-on Cement

该技术能保证固井候凝过程中井底压力平衡，施工安全。

The technologies could ensure the well bottom pressure keeping balanced during waiting on cement and cementing safety .

候凝时加不上回压，固井后管外冒油冒气。

And back pressure can not be applied when cement solidifies so that oil / gas emits outside casing after cementing .

在固井候凝期间，由于蹩压引起套管弹性膨胀，在水泥环与套管之间形成微环隙。

In solidification period of cementing , well casing inflation due to high pressure causesmicroannulus between casing and cement annulus outside the casing .

钻开油气层之前应采取相应的停注、泄压和停抽等措施，直到相应层位套管固井候凝完为止。

Before drilling into the pay zone , measures such as injection suspension , pressure relief and pump off shall be conducted till the casing cementing completed .

在水泥浆中引入膨胀剂和套管内敞压候凝技术，消除因内部压力和水泥浆固有的膨胀-收缩特性而造成的微裂缝-微孔隙，实现环空密封。

Adding the swelling agent in the slurry and adopting the opening WOC technology in the casing , to eliminate the micro-fractures or pores caused by the inner pressure and the inflation-contraction feature of the cement slurry , to seal off the annular .