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Continuous Direction and Inclination Measurements Lead to an Improvement in Wellbore Positioning

机译：连续的方向和倾斜度测量可改善井眼定位

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The measurement of continuous real-time inclination providesnear instantaneous calculations of the build-up rate tendencyof a bottom hole assembly in both rotary and slide drillingmodes. The addition of an azimuthal measurement nowallows for the calculation of wellbore position with thiscontinuous data. The true nature of the wellbore curvature inslide/rotate directional drilling with steerable systems is lostwhen using the typical 90-foot survey interval. Continuoussurveying shows this effect. When wellbore position iscalculated with the continuous surveys, a significant positionaldiscrepancy from the stationary surveys can occur.A study was conducted using both stationary and continuoussurvey data from over 20 wells in Nigeria, Angola, the Gulf ofMexico, the North Sea and Indonesia. The objective was todetermine the magnitude and scope of TVD positional errorcaused by the different slide and rotate curvatures betweenstationary surveys on a wide range of wells. These curvaturesare not reamed out as commonly thought. They can still beseen in continuous gyro surveys taken after drilling hasfinished. This positional effect is not a function of the sensoraccuracy, but it is a result of the environment in which surveysare measured. We show that in a horizontal well the effect canaccumulate up to plus/minus 25 ft TVD. The implications ofthese results are far reaching. Survey positions are used increating structure and reservoir maps, which are used indetermining reserves and recovery efficiencies, and in turn formaking field management decisions.This paper highlights the results of the field studies. A reviewof rotary steerable system operations shows that the effect ismuch less than with steerable motors, but can still beof concern. A low-cost solution for effectively determining when to slideand rotate with respect to the stationary survey is presented.This procedure results in a positional accuracy that can bemaintained without changing survey data managementpractices.
机译：连续实时倾斜的测量提供了在旋转和滑动钻进模式下井底钻具总成率趋势的近瞬时计算。现在，增加方位角测量值即可使用此连续数据计算井眼位置。当使用典型的90英尺测量间隔时，就失去了使用可控系统的井眼曲率滑动/旋转定向钻井的真实本性。连续调查显示了这种效果。当通过连续调查计算井眼位置时，可能会发生来自固定调查的明显位置差异。使用尼日利亚，安哥拉，墨西哥湾，北海和印度尼西亚的20多个井的固定和连续调查数据进行了一项研究。目的是确定在大范围的固定井之间进行静止测量之间，由于滑动和旋转曲率不同而引起的TVD位置误差的大小和范围。这些曲率并未像通常认为的那样被消除。在钻探完成后，仍可以在连续进行的陀螺仪测量中看到他们。这种位置效应不是传感器精度的函数，而是测量环境的结果。我们显示，在水平井中，效果最多可累积正负25英尺TVD。这些结果的影响是深远的。勘测位置用于创建结构和储层图，用于确定储量和采收率，进而用于制定野外管理决策。本文重点介绍了野外研究的结果。对旋转转向系统操作的回顾表明，其效果远不及转向电机，但仍然值得关注。提出了一种有效确定相对于固定测量仪何时滑动和旋转的低成本解决方案。该程序可实现无需更改测量数据管理方法即可保持的位置精度。

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