CAJ | 학술논문

为有效克服气体钻井过程中出现的井壁失稳现象,提出一种气体钻井井壁稳定性分析的简易方法.该方法在对传统气体钻井井壁稳定性理论的利弊进行分析的基础上,从气体钻井井壁围岩的力学特性出发,确定了井壁围岩应力场的分布,结合Mohr-Coulomb准则,建立了气体钻井条件的井壁稳定模型,即弹塑性模型和硬脆性模型,成功解释了气体钻井条件下地层进入塑性状态变形达到一定程度,井壁坍塌井径扩大后,地层趋于稳定的现象.将该计算模型应用于满东2井的井壁稳定性分析,结果表明:理论分析结果和工程实测数据对比,计算结果较为准确,验证了该模型较为有效.
위유효극복기체찬정과정중출현적정벽실은현상,제출일충기체찬정정벽은정성분석적간역방법.해방법재대전통기체찬정정벽은정성이론적리폐진행분석적기출상,종기체찬정정벽위암적역학특성출발,학정료정벽위암응력장적분포,결합Mohr-Coulomb준칙,건립료기체찬정조건적정벽은정모형,즉탄소성모형화경취성모형,성공해석료기체찬정조건하지층진입소성상태변형체도일정정도,정벽담탑정경확대후,지층추우은정적현상.장해계산모형응용우만동2정적정벽은정성분석,결과표명:이론분석결과화공정실측수거대비,계산결과교위준학,험증료해모형교위유효.
In order to overcome the borehole unstability in gas drilling, a simple means for gas drilling wellbore stability analysis was proposed. This means analyzed the benefits and drawdowns of the conventional gas drilling wellbore stability theory and determined the stress field distribution of the wellbore surrounding rocks on base of the mechanical features. The gas drilling wellbore stability model which is actually elastoplasticity model and friable hard model was built up as per Mohr-Coulomb Law. And this model can suc-cessfully demonstrate the formation stability trends after the plastic deformation of the gas drilled formation goes up to some degree and wellbore collapsed and enlarged. The calculation model was used on the wellbore stability analysis of Mandong-2 Well. In conclusion, according to comparison between theoretical analysis results and measured data, the calculated data is more accurate and the model is proved to be better.