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    • 94. 发明申请
    • METHOD AND APPARATUS FOR CONTROLLING BOTTOM HOLE PRESSURE IN A SUBTERRANEAN FORMATION DURING RIG PUMP OPERATION
    • 用于在钻机操作期间控制下层形成中的底孔压力的方法和装置
    • WO2008051978A1
    • 2008-05-02
    • PCT/US2007/082245
    • 2007-10-23
    • M-I L.L.C.SMITH INTERNATIONAL, INC.DUHE, JasonMAY, James
    • DUHE, JasonMAY, James
    • E21B43/00
    • E21B21/08
    • A method for maintaining pressure in a wellbore during drilling operations is disclosed. The method includes lhe steps of providing fluid from a reservoir through a drill string, circulating the fluid from the drill string to an annυlus between the drill string and the wellbore, isolating pressure in the annulus, measuring pressure in the annulus, calculating a set point backpressure, applying back pressure to the annulus based on thc set point back pressure, diverting fluid from the annulus to a controllable choke, eontrollably bleeding off pressurized fluid from the annulus, separating solids from the fluid, and directing the fluid back to the reservoir. An apparatus for maintaining pressure in a wellbore during drilling operations that includes an adjustable choke for eontrollably bleeding off pressurized fluid from the wellbore annulus. a backpressure pump for applying a calculated set point backpressure, and a processor for controlling the adjustable choke and backpressure pump is also disclosed.
    • 公开了一种用于在钻井操作期间维持井眼中的压力的​​方法。 该方法包括以下步骤:通过钻柱提供来自储存器的流体,将流体从钻柱循环到钻柱和井筒之间的孔隙,隔离环空中的压力,测量环空中的压力,计算一个 设定点背压,基于设定点背压向环形空间施加背压,将流体从环带转向可控制的扼流圈,从环形空间排出加压流体,将固体与流体分离,并将流体引导回到 水库。 一种用于在钻井操作期间保持井眼内的压力的装置,其包括可调节的扼流圈,用于可控地从井眼环带排出加压流体。 还公开了一种用于施加计算出的设定点背压的背压泵和用于控制可调扼流圈和背压泵的处理器。
    • 96. 发明申请
    • CUTTER ELEMENT ADAPTED TO WITHSTAND TENSILE STRESS
    • 切割元件适应耐受拉伸应力
    • WO1997048877A1
    • 1997-12-24
    • PCT/US1997010714
    • 1997-06-19
    • SMITH INTERNATIONAL, INC.
    • SMITH INTERNATIONAL, INC.PORTWOOD, Gary, Ray
    • E21B10/36
    • E21B10/16E21B10/52
    • A cutter element (62) having a substantially flat wear face and leading (64) and trailing (66) sections, wherein the leading section (64) is sharper than the trailing section (66). Sharpness is defined as either a smaller inside angle at the intersection of a pair of planes or as a smaller radius of curvature. The insert of the present invention experiences reduced stress on its trailing portion and therefore is less subject to extreme wear and failure. The present invention can be applied with particular advantage to heel row cutters, but can also be applied to cutters in other rows that primarily ream the borehole wall. The present cutter element can be constructed so as to have either a positive or negative rake angle at its leading section, or to have any of a variety of shapes, depending on the characteristics of the formation in which it is to be used.
    • 具有基本上平坦的磨损面和引导(64)和后部(66)部分的切割器元件(62),其中所述引导部分(64)比所述尾部部分(66)更尖锐。 清晰度被定义为在一对平面的交点处较小的内角或较小的曲率半径。 本发明的插入件在其尾部处经受较小的应力,因此较少遭受极度的磨损和破坏。 本发明可以特别适用于后跟行切割器,但是也可应用于其他行中的主要钻孔的切割器。 本刀片元件可以构造成在其前部具有正的或负的前角,或者根据其使用的地层的特性而具有各种各样的形状。
    • 98. 发明申请
    • ACTUATING BALL
    • 执行球
    • WO1997036088A1
    • 1997-10-02
    • PCT/GB1997000819
    • 1997-03-24
    • SMITH INTERNATIONAL, INC.APPLETON, Robert, Patrick
    • SMITH INTERNATIONAL, INC.
    • E21B23/04
    • E21B23/006E21B34/063E21B34/14F16K13/04Y10T137/1789
    • The present invention relates to tools for use in wellbores which are actuated by means of actuating balls. The invention provides a method of actuating a tool located in a wellbore, the method comprising the sequential steps of: (a) locating a frangible actuating ball (2) on a seat, the seat being provided in the tool for receiving the actuating ball (2); (b) pumping fluid down a tubing string attached to the tool so as to apply a force to the seat and thereby actuate the tool, the force being transmitted to the seat through the actuating ball (2); and (c) breaking the actuating ball (2) to permit fluid to flow through the seat. The invention has the advantage over the prior art of providing means for actuating a downhole tool with an actuating ball (2) so that the actuating ball (2) does not form an undesirable obstruction once the tool has been actuated.
    • 本发明涉及用于通过致动球致动的井眼中的工具。 本发明提供了一种致动位于井筒中的工具的方法,该方法包括以下顺序步骤:(a)将易碎致动球(2)定位在座椅上,所述座椅设置在工具中以接收致动球( 2); (b)将液体沿着连接到工具的油管柱向下泵送,以便向座椅施加力并由此致动工具,该力通过致动球(2)传递到座椅; 和(c)打破致动球(2)以允许流体流过座椅。 本发明具有优于现有技术的优点,即提供用于用致动球(2)致动井下工具的装置,使得一旦工具被致动,致动球(2)就不会形成不期望的障碍物。