CAJ | 학술논문

螺杆钻具虽然应用广泛，但使用螺杆钻具条件下的钻井水力参数优化设计方法还不完善。为了指导钻井现场应用，以螺杆钻具的推荐工作参数为约束条件，应用数学规划方法建立了钻井液排量和钻头压降优选模型，给出了实用的钻井水力参数优化设计方法。研究表明，使用螺杆钻具时，应在螺杆钻具推荐工作参数内，以钻头水功率与螺杆钻具水功率之和最大为指标优选钻井水力参数；为了获得最优水力参数，螺杆钻具工作压降尽可能采用推荐工作压降，钻头压降尽可能接近螺杆钻具传动轴限定的最大钻头压降。
라간찬구수연응용엄범，단사용라간찬구조건하적찬정수력삼수우화설계방법환불완선。위료지도찬정현장응용，이라간찬구적추천공작삼수위약속조건，응용수학규화방법건립료찬정액배량화찬두압강우선모형，급출료실용적찬정수력삼수우화설계방법。연구표명，사용라간찬구시，응재라간찬구추천공작삼수내，이찬두수공솔여라간찬구수공솔지화최대위지표우선찬정수력삼수；위료획득최우수력삼수，라간찬구공작압강진가능채용추천공작압강，찬두압강진가능접근라간찬구전동축한정적최대찬두압강。
Although positive displacement dow n-hole motor (PDM )is commonly used in directional drilling at present ,not much effort has been made in research on the optimization methods for drilling hy-draulic parameters when using a PDM .An optimization model in drilling fluid rate and drill bit nozzle pres-sure-drop selection has been established by mathematical programming method w hile taking PDM ’s recom-mended operating parameters as constrain conditions .T he research results show that hydraulic parameters should be optimized within PDM ’s recommended operating parameters while taking maximum total hy-draulic power designated to drill bit and PDM as the target .To obtain optimum drilling hydraulic parame-ters ,the PDM’s working pressure-drop should be within the recommended working pressure-drop while bit nozzle pressure-drop is close to the maximum of that transmission shaft of the down hole motor allows to .