CAJ | 학술논문

深水表层土壤松软，导管通常采取喷射的方式下入，井口径向稳定性能薄弱，尤其在深水新区块探井海底地质情况不明确、浅层土质强度参数不准确的情况下，水下井口径向稳定性问题尤为重要。为提高水下井口径向载荷的稳定性，针对现场作业中表层套管在固井前循环及注水泥固井期间出现的井口下沉现象，进行导管在表层套管固井期间的径向受力情况分析，结合现场作业实践，提出了防止井口下沉的方法，并且在作业实践中得到了成功应用，提高了水下井口径向载荷的稳定性，有效促进了深水表层作业的顺利、安全进行，保证了深水钻井的安全性。
심수표층토양송연，도관통상채취분사적방식하입，정구경향은정성능박약，우기재심수신구괴탐정해저지질정황불명학、천층토질강도삼수불준학적정황하，수하정구경향은정성문제우위중요。위제고수하정구경향재하적은정성，침대현장작업중표층투관재고정전순배급주수니고정기간출현적정구하침현상，진행도관재표층투관고정기간적경향수력정황분석，결합현장작업실천，제출료방지정구하침적방법，병차재작업실천중득도료성공응용，제고료수하정구경향재하적은정성，유효촉진료심수표층작업적순리、안전진행，보증료심수찬정적안전성。
The deepwater surface soil is loose and soft, the pipe is lowered by ejection generally, and the wellhead radial stabil-ity performance is weak. In particular, when the subsea geology of well exploration in the deepwater new block is not clear and the intensity parameters of superifcial layer soil are inaccurate, the radial stability of underwater wellhead is especially important. In order to improve the stability of radial load of underwater wellhead, based on the wellhead sinking of surface casing during the circulation before cementation and during the cementing period in the site operation, the radial stress of pipe during the surface casing cementation period is analyzed; furthermore, according to the site operation practices, the method for wellhead sinking prevention has been raised and successfully applied in the operation practices. It improved the stability of radial load of underwater wellhead, effectively promoted the smooth and safe deepwater surface layer operation, and guaranteed the safety of deepwater drilling.