公开(公告)号：US06705406B2

公开(公告)日：2004-03-16

申请号：US10106540

申请日：2002-03-26

申请人： Pralay K. Das ,  Joe Marzouk

发明人： Pralay K. Das ,  Joe Marzouk

IPC分类号： E21B2300

CPC分类号： E21B47/01

摘要： A downhole tool for use in a wellbore, comprises a tubular member, such as a drill collar housing, in a drill string. The tubular member has at least one cavity formed on an external surface. At least one housing is adapted to be insertable and extractable in the cavity without further tool disassembly. The housing has at least one electrical device such as a battery stack disposed within. In another aspect, sensors are disposed in the housing for measuring downhole parameters of interest including, but not limited to, annulus pressure and annulus temperature. A method of replacing an electrical device in a downhole tool, comprises removing a first housing containing the electrical device from a cavity on an external surface of the downhole tool, and installing a second housing containing a second electrical device in the cavity without disassembling the tool further.

摘要翻译： 用于井眼的井下工具包括在钻柱中的管状构件，例如钻铤壳体。 管状构件具有形成在外表面上的至少一个空腔。 至少一个壳体适于在腔中可插入和抽出，而无需进一步的工具拆卸。 壳体具有至少一个电气装置，例如设置在其内的电池组。 在另一方面，传感器设置在壳体中用于测量感兴趣的井下参数，包括但不限于环空压力和环空温度。 一种替换井下工具中的电气装置的方法，包括从所述井下工具的外表面上的空腔中移除容纳所述电气装置的第一壳体，以及将包含第二电气装置的第二壳体安装在所述腔中而不拆卸所述工具 进一步。

公开(公告)号：US06839000B2

公开(公告)日：2005-01-04

申请号：US10055485

申请日：2001-10-29

申请人： Pralay K. Das ,  Eric Joseph Deutsch ,  Charles Haynes

发明人： Pralay K. Das ,  Eric Joseph Deutsch ,  Charles Haynes

IPC分类号： G01V11/00 ,  G01V3/00

CPC分类号： G01V11/00

摘要： An integrated, single collar measurement while-while-drilling tool is presented that comprises formation sensors, directional sensors, pressure sensors, a mud pulse telemetry device, and a turbine-generator power device configured in a single collar housing that is no longer than a standard drill collar. No electrical connections are made across drill collar tool joints. The tool provides high reliability and ease of transportation.

摘要翻译： 提供了一种集成的单项测量同时钻探工具，其包括地层传感器，定向传感器，压力传感器，泥浆脉冲遥测装置和配置在单个轴环壳体中的涡轮发电机功率装置，其不再是 标准钻铤。 在钻铤工具接头上没有电气连接。 该工具提供高可靠性和易于运输。

公开(公告)号：US4805449A

公开(公告)日：1989-02-21

申请号：US126645

申请日：1987-12-01

申请人： Pralay K. Das

发明人： Pralay K. Das

IPC分类号： E21B21/08 ,  E21B47/06 ,  G01L9/00

CPC分类号： G01L9/0089 ,  E21B21/08 ,  E21B47/06

摘要： An apparatus and method for measuring differential pressure of mud internal a drill string and mud in a borehole annulus is disclosed. The apparatus typically comprises: a drill collar having a pressure balancing piston in hydraulic contact with the borehole annulus mud; a shaped cylinder in contact with the mud internal the drill string and supported by the drill collar but attached such that axial forces on the drill collar are not transferred to the shaped cylinder, wherein the shaped cylinder has relatively thicker end portions in contact with the drill collar, and a relatively thinner middle portion such that a gap is formed between the relatively thinner middle portion of the shaped cylinder and the drill collar; a fluid filling the gap and in hydraulic contact with the pressure balancing piston; a plurality of strain gauges axially and circumferentially disposed around the relatively thinner middle portion of the shaped cylinder, wherein the axially disposed strain gauges provide an indication of axial stress and the circumferentially disposed strain gauges provide an indication of hoop stress; and method for obtaining at least one axial and hoop stress measurement from the plurality of strain gauges, for taking the difference between hoop and axial measurements, and for providing a pressure determination representing the difference of mud pressure.

公开(公告)号：US5386724A

公开(公告)日：1995-02-07

申请号：US115285

申请日：1993-08-31

申请人： Pralay K. Das ,  Haoshi Song

发明人： Pralay K. Das ,  Haoshi Song

IPC分类号： E21B47/00 ,  G01L5/00 ,  G01L5/16

CPC分类号： G01L5/161 ,  E21B47/0006 ,  G01L5/0042

摘要： A load cell for sensing weight and torque on a drill bit during a drilling operation includes a cylindrical load cell made from a material with minimum residual stress. A plurality of strain gages are arranged symmetrically on each load cell and electrically coupled to form two Wheatstone bridges. The load cells are mounted 180 degrees apart in radial pockets drilled in a drill collar wall. A half Wheatstone bridge from one load cell is electrically coupled with a half Wheatstone bridge from the other load cell to form a Wheatstone bridge for measuring WOB and a similar coupling is made to form another Wheatstone bridge for measuring TOB. In another embodiment, additional strain gages in another Wheatstone bridge measure differential pressure. The output of the pressure and weight bridges are electrically combined to provide a weight signal unaffected by differential pressure fluctuations. The load cells are force fit in the radial pockets in the drill collar and a cap is installed on each pocket housing a load cell to protect the load cell from drilling fluid. The strain gages in each load cell are placed to minimize the effects of bending, hydrostatic pressure, temperature, differential pressure and cross talk between WOB and TOB measurements. The load cells can be replaced easily and drill collar gauging is not required. Since the strain gages are not directly attached to the drill collar, the high residual stress in the drill collar does not cause the strain gages to drift.

摘要翻译： 用于在钻孔操作期间感测钻头上的重量和扭矩的测力传感器包括由具有最小残余应力的材料制成的圆柱形测力传感器。 多个应变计对称地布置在每个测力传感器上并电耦合以形成两个惠斯登电桥。 称重传感器在钻铤壁上钻出的径向凹槽中180度分开安装。 来自一个称重传感器的一个惠斯登电桥与另一个称重传感器的一半惠斯通电桥电耦合，形成用于测量WOB的惠斯登电桥，并形成一个类似的耦合，形成用于测量TOB的另一个惠斯通电桥。 在另一个实施例中，另一惠斯通电桥中的附加应变计测量差压。 压力和重量桥梁的输出电气组合以提供不受压差波动影响的重量信号。 称重传感器强制配合在钻铤中的径向凹穴中，并且在每个容纳有负载传感器的口袋上安装盖，以保护测力传感器免受钻井液体的影响。 放置每个称重传感器中的应变计以最小化WOB和TOB测量之间的弯曲，静水压力，温度，压差和串扰的影响。 可以轻松更换称重传感器，不需要钻铤测量。 由于应变计不直接附着在钻铤上，钻铤中的高残余应力不会导致应变计漂移。

公开(公告)号：US4739841A

公开(公告)日：1988-04-26

申请号：US896891

申请日：1986-08-15

申请人： Pralay K. Das

发明人： Pralay K. Das

IPC分类号： E21B7/04 ,  E21B47/00 ,  E21B47/022 ,  E21B7/08

CPC分类号： E21B47/0006 ,  E21B47/022 ,  E21B7/04

摘要： In the representative embodiments of the present invention described herein, new and improved methods and apparatus are disclosed for measuring various forces acting on an intermediate body between the lower end of a drill string and the earth-boring apparatus coupled thereto whereby the magnitudes and angular directions of bending moments and side forces acting on the earth-boring apparatus can be readily determined so that predictions can be made of the future course of excavation of the apparatus.

摘要翻译： 在本文描述的本发明的代表性实施例中，公开了新的和改进的方法和装置，用于测量作用在钻柱的下端和与其连接的钻孔装置之间的中间体的各种力，由此大小和角度方向 可以容易地确定作用在镗孔装置上的弯矩和侧力，以便能够预测设备的未来掘进过程。