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A Comprehensive Prediction Model of Hydraulic Extended-Reach Limit Considering the Allowable Range of Drilling Fluid Flow Rate in Horizontal Drilling

机译:考虑水平钻井液流速的水力延伸极限综合预测模型

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摘要

Hydraulic extended-reach limit (HERL) model of horizontal extended-reach well (ERW) can predict the maximum measured depth (MMD) of the horizontal ERW. The HERL refers to the well’s MMD when drilling fluid cannot be normally circulated by drilling pump. Previous model analyzed the following two constraint conditions, drilling pump rated pressure and rated power. However, effects of the allowable range of drilling fluid flow rate (Q min ≤ Q ≤ Q max) were not considered. In this study, three cases of HERL model are proposed according to the relationship between allowable range of drilling fluid flow rate and rated flow rate of drilling pump (Q r). A horizontal ERW is analyzed to predict its HERL, especially its horizontal-section limit (L h). Results show that when Q min ≤ Q r ≤ Q max (Case I), L h depends both on horizontal-section limit based on rated pump pressure (L h1) and horizontal-section limit based on rated pump power (L h2); when Q min < Q max < Q r (Case II), L h is exclusively controlled by L h1; while L h is only determined by Lh2 when Qr < Qmin < Qmax (Case III). Furthermore, Lh1 first increases and then decreases with the increase in drilling fluid flow rate, while Lh2 keeps decreasing as the drilling fluid flow rate increases. The comprehensive model provides a more accurate prediction on HERL.
机译:水平延伸井(ERW)的水力延伸极限(HERL)模型可以预测水平ERW的最大测得深度(MMD)。当钻井液无法通过钻井泵正常循环时,HERL是指井的MMD。先前的模型分析了以下两个约束条件,即钻井泵的额定压力和额定功率。但是,没有考虑钻井液流量的允许范围(Q min≤QQ≤Qmax)的影响。本研究根据钻井液允许流量范围与钻井泵额定流量(Qr)之间的关系,提出了三种HERL模型。对水平ERW进行分析以预测其HERL,尤其是其水平截面极限(L h)。结果表明,当Q min≤Q r≤Q max(情况I)时,L h 取决于泵额定压力( L h1 )和基于额定泵浦功率( L h2 )的水平截面极限;当 Q min em> Q max em> Q r (第二种情况), L h L h1 唯一控制;而 L h 仅由 L 确定 h2 Q r em> Q min em> Q max (案例III)。此外, L h1 首先随着钻井液流速的增加而增加,然后减小,而 L 随着钻井液流速的增加, h2 不断减小。全面的模型提供了关于HERL的更准确的预测。

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