井径扩大率

基于弹性力学理论及岩石摩尔-库仑强度破坏准则，提出了欠平衡钻井条件下井径扩大率的预测方法。

Based on the theory of elasticity and molar-Coulomb strength failure criterion , we proposed the prediction method for hole enlargement ratio in the condition of underbalanced drilling .

抑制性能好，井壁稳定，实验井的平均井径扩大率明显低于邻井；

It has good shale inhibition and wellbore stability , and the hole enlargement ratio of the testing well is obviously lower than that of the offset well ;

井壁坍塌破坏过程的数值模拟及井径扩大率预测

Numerical Simulation of Borehole Collapse Procedure and Prediction on Well-hole Enlargement

井径扩大率超标是鄂北工区井身质量存在的最大问题，一般都达到20%～30%，严重影响成井质量。

The unallowable wellbore enlargement rate ( 20 % - 30 % ) is the severest problem of wellbore qualities in the job area of north of Hubei .

完井电测数据表明，最大井径扩大率由68%下降至8%，同时使建井周期缩短28%。

The modified KCl / polymer drilling fluids can reduce the maximum hole enlargement rate from 68 % to 8 % , and shorten the well construction time by 28 % .

现场应用结果表明，该井井眼稳定，井径扩大率很小，有效地解决了井眼失稳问题。

The wellbore is effectively protected from sloughing with small enlargement rate because of applying these techniques .

试验井三叠系、石炭系平均井径扩大率小于6%，完井电测及下套管固井等作业顺利。

Hole enlargement through the Tertiary system and the Carboniferous system in test wells are less than 6 % , therefore , got a successful completion logging and running casing strings .

现场应用结果表明，应用该储层保护技术的3口井，目的层井段平均井径扩大率为0.66%，比未采用该技术的邻井缩小了5.78%；

In-situ using in 3 wells showed that , in the target formation , the average caliper enlargement rate was 0.66 % , 5.78 % reduced comparing with adjacent wells ;

与邻井相比，三开井段的平均井径扩大率由14.6%下降至3.14%，从而显著提高了钻井效率。

Compared with the adjacent well , the enlargement ratio of well bore diameter of the key tested well was reduced from 14.6 percent to 3.14 percent , which indicates that the drilling efficiency has been improved significantly .

5口井的应用表明，使用ZSC-201固相化学清洁剂，平均井径扩大率为10.18%，解决了上部地层水化膨胀、缩径问题，保证了起下钻的畅通；

ZSC-201 has been used in five wells and the results displayed that hydration swelling and shrinking of upper formation was prevented with average borehole enlargement rate of 10.18 % ;

介绍了有机盐钻井液在DH1-8-6井的现场应用情况。应用结果表明，该井二开段井眼平均井径扩大率为5.4%；

Its field using in well DH1-8-6 is presented , and using results show that the average hole enlargement for the second section is5.4 % ;