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公开(公告)号：US5454436A
公开(公告)日：1995-10-03
申请号：US265288
申请日：1994-06-24
CPC分类号： E21B44/04 , E21B47/0006
摘要： A method of warning of the onset of pipe sticking in a rotary drilling operation using a drill string comprising: (a) monitoring the pressure of a drilling fluid being pumped through the drill string during drilling over predetermined periods of time to obtain series of pressure measurements; (b) monitoring the torque required to rotate the drill string during said periods to obtain series of torque measurements; (c) obtaining the skew (third moment) of each series of pressure measurements according to the relationship ##EQU1## wherein N is the number of pressure measurements xi in the series, xmean is the average value of the measurements in the series, and .sigma. is the standard deviation of the measurements in the series; (d) obtaining the normalized standard deviation .sigma.n of the torque measurements in each corresponding series of torque measurements according to the relationship .sigma.n=(.sigma./ymean) wherein .sigma. is the standard deviation of the measurements in the series and ymean is the average value of the measurements in the series; and (e) comparing skew and .sigma.n for the series so as to identify corresponding changes in both and raising an alarm when the magnitude of said changes pass predetermined alarm values.
摘要翻译： 一种在使用钻柱的旋转钻井操作中警告管道粘连开始的方法，包括：（a）监测在预定时间段内钻取期间被泵送通过钻柱的钻井液的压力，以获得一系列压力测量值 ; （b）监测在所述时段期间旋转钻柱所需的扭矩以获得一系列扭矩测量; （c）根据关系
获得每一系列压力测量的偏斜（第三时刻），其中N是该系列中的压力测量数xi，xmean是该系列中的测量值的平均值，而西格玛 是系列中测量的标准偏差; （d）根据sigma n =（sigma / ymean）的关系求得每个对应的扭矩测量系列中的扭矩测量值的归一化标准偏差σn，其中sigma是串联测量的标准偏差，ymean是平均值 系列中的测量值; 以及（e）比较该系列的偏差和σn，以便当所述变化的幅度通过预定的报警值时，识别两者中的相应变化并提高报警。 -
2.发明授权Method for determining fluid influx or loss in drilling from floating rigs 失效用于确定流体钻井液中钻井液的流失或损失的方法
公开(公告)号：US5205165A
公开(公告)日：1993-04-27
申请号：US832161
申请日：1992-02-06
CPC分类号： E21B21/08 , E21B21/001
摘要： A method of determining fluid influx or loss from a well being drilled from a floating vessel and using a drilling fluid, the method comprising monitoring the flow of fluid from the well to obtain a varying signal indicative of the variation in flow from the well, monitoring the heave motion of the vessel to obtain a varying signal indicative of said motion, using the signal indicative of the heave motion to calculate the expected variation in fluid flow from the well due to said motion, using said calculated flow to correct the varying flow signal to compensate for any flow component due to heave motion and monitoring the compensated signal for an indication of fluid influx or loss from the well.
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公开(公告)号：US5205166A
公开(公告)日：1993-04-27
申请号：US741283
申请日：1991-08-07
IPC分类号： E21B21/08
CPC分类号： E21B21/08
摘要： A method of detecting a fluid influx in a well being drilled with a drill string having a drilling fluid circulated therethrough from a tank via a supply line system connected to the drill string, the method being used while connecting or disconnecting a pipe to or from the drill string and comprising the steps of:a) ceasing circulation of the drilling fluid;b) disconnecting the supply line system from the drill string so as to allow any drilling fluid in the system to flow back into the tank while connecting or disconnecting a pipe;c) reconnecting the supply line to the drill string and recommencing circulation of the fluid;d) while repeating a)-c) during the normal course of drilling the well, monitoring the change in level of fluid in the tank so as to determine a model of the change in level in the tank with respect to time during steps a)-c); ande) comparing the change in tank level observed when subsequently performing steps a)-c) with the change predicted by the model so as to detect a difference therebetween indicative of an influx.
摘要翻译： 一种检测在钻井孔中的流体流入的方法，所述钻柱具有通过连接到钻柱的供应管线系统从油箱经过其循环的钻井液的钻柱，所述方法用于在将管道连接或断开 钻柱，包括以下步骤：a）停止钻井液的循环; b）将供应线系统与钻柱断开，以允许系统中的任何钻井流体在连接或断开管道的同时流回到罐中; c）将供应管线重新连接到钻柱并重新开始流体循环; d）在钻井的正常过程期间重复a）-c），监测罐中流体的水平变化，以便在步骤a）期间确定罐中的水平相对于时间的变化的模型， -C）; 以及e）比较当随后执行步骤a）-c）观察到的罐水平的变化与由模型预测的变化，以便检测指示流入的差异。
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公开(公告)号：US5368108A
公开(公告)日：1994-11-29
申请号：US142734
申请日：1993-10-26
IPC分类号： E21B44/00
CPC分类号： E21B44/005
摘要： To optimize the drilling of a borehole with a positive displacement downhole mud motor which rotates a drill bit, the hydraulic power input to the motor and the mechanical power output of the motor are calculated based upon measurements of weight-on-bit (WOB), torque, bit rotational speed and pressure drop across the motor. These input and output values are plotted versus one another to produce a characteristic curve which indicates the maximum achievable power output of the motor. The values used by the driller are compared to such maximum to enable adjustment of WOB such that drilling at maximum efficiency for a given lithology can be achieved. Other important information such as optimum standpipe pressure and operating efficiency and wear of the motor also are determined.
摘要翻译： 为了优化利用旋转钻头的正位移井下泥浆马达钻孔钻孔，基于钻头重量（WOB）的测量来计算输入到马达的液压动力和马达的机械动力输出， 转矩，转速和电机两端的压降。 这些输入和输出值相互绘制，以产生指示电机最大可实现功率输出的特性曲线。 将钻机使用的值与这样的最大值进行比较，以使得能够调整WOB，使得可以实现给定岩性的最大效率的钻孔。 还确定了其他重要信息，例如最佳立管压力和操作效率以及电动机的磨损。
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5.发明授权
公开(公告)号：US5115871A
公开(公告)日：1992-05-26
申请号：US664261
申请日：1991-03-04
CPC分类号： E21B49/003 , E21B21/08 , E21B47/06
摘要： A method for the estimation of pore pressure within a subterranean formation containing fluid during the drilling of a bore hole. The bore hole is drilled using a drill string consisting of a drill bit fitted to its lower end, and using drilling mud pumped from the surface through the drill string and finally evacuated. The method is characterized by, while the drill bit is level with the formation and while the drill string is being raised to the surface for a distance at least equalling the drill pipe length,a) the monitoring of the change in value of an initial parameter such as mud level in a mud tank to detect the influx of the fluid from the formation into the bore hole;b) the monitoring of the change in value of a second parameter such as the apparent drill string weight whereby the second parameter characterizes the force applied at the surface to retrieve the drill string;(c) the correlation of the values of the first and second parameters in order to detect an increase in one of the parameters, which would correspond to an increase of the other parameter, and then the determination of the increase in value of the second parameter, andd) the estimation of the pore pressure of the formation from the increase in value of the second parameter as determined in step c).
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