CAJ | 학술논문

现代控压钻井作业中，依靠自动节流管汇施加和控制井口回压，从而间接控制井底压力。但由于阀门的压力调节特性与阀门开度存在较大的非线性，常规节流管汇很难通过单个节流阀实现全开度范围内的精确调节。为了提高控制精度，利用节流阀工作的3个状态，建立了压力调节特性与流量调节特性的对应关系，进而建立了节流管汇的压力调节特性模型，并对压力调节精度及流量对压力调节特性的影响进行了分析。研究分析表明，现有节流阀压力调节特性呈现一定非线性；通过优化阀芯可以增大节流阀的有效工作区间，但不能完全消除超调区间；钻井液排量对节流阀的压力调节特性影响较大，设计节流管汇时应考虑排量问题。
현대공압찬정작업중，의고자동절류관회시가화공제정구회압，종이간접공제정저압력。단유우벌문적압력조절특성여벌문개도존재교대적비선성，상규절류관회흔난통과단개절류벌실현전개도범위내적정학조절。위료제고공제정도，이용절류벌공작적3개상태，건립료압력조절특성여류량조절특성적대응관계，진이건립료절류관회적압력조절특성모형，병대압력조절정도급류량대압력조절특성적영향진행료분석。연구분석표명，현유절류벌압력조절특성정현일정비선성；통과우화벌심가이증대절류벌적유효공작구간，단불능완전소제초조구간；찬정액배량대절류벌적압력조절특성영향교대，설계절류관회시응고필배량문제。
In modern managed pressure drilling operation ,automatic choke manifold is used to provide and control wellhead back pressure so as to control formation pressure .Due to the nonlinear relationship between regulating pressure and choke valve opening ,it is difficult to adjust the choke valve accurately by a single choke valve within the scope of full opening in conventional choke manifold .In order to enhance con-trolling precision ,the corresponding relation of pressure regulation performance and flow rate was estab-lished based on the three working states of choke valve ,the model of pressure regulation performance was also developed .By analyzing the pressure adjusting precision and the effect of flow rate on pressure regula-tion performance ,it is considered that pressure regulation performance of choke valve is somew hat non-lin-ear ,optimization of valve core can increase its effective working range ,but it can’t eliminate super-adjus-ting scope ,the flow rate of drilling fluids has a great effect on pressure regulation performance of choke valve ,the flow rate should be paid great attention w hen designing the choke manifold .