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    • 93. 发明公开
    • SYSTEM AND METHOD FOR PERFORMING INVERSION ON LWD RESISTIVITY LOGS WITH ENHANCED RESOLUTION
    • 系统和方法用于进行反演导通电阻与SURVEYS分辨率提高
    • EP0886794A3
    • 2002-11-20
    • EP97939857.5
    • 1997-03-11
    • Halliburton Company
    • STRICKLAND, Robert W.MERCHANT, Gulamabbas A.JACKSON, Charles E.ILLFELDER, Herbert Max Joseph
    • G01V3/38
    • G01V3/38
    • An improved system and method for performing inversion and for correcting for shoulder bed effect. The method enhances the resolution of wave propagation resistivity logs and corrects the logs for adjacent bed effects, whereby the resulting logs have a vertical response as good as wireline high-resolution induction logs. The method first performs logging while drilling on a formation to obtain LWD resistivity log data. The method then selects one or more control depths at one or more locations of each of a plurality of detected beds in the formation. The present invention includes a novel method for selecting bed boundaries from the log data, and the control depths are then determined based on the determined bed boundaries. The method then estimates the resistivity of each bed only at the selected control depths to produce an estimated resistivity of the beds. The method then computes a simulated log value at each control depth using a current estimate of the resistivity of the beds. The computed simulated log is then compared to the actual log data at each control depth, and the resistivity of each bed is adjusted using the difference between the actual and simulated values at the control depths. The above method iteratively repeats a plurality of times until the simulated log substantially matches the actual log at the control depths. The method for determining the bed boundaries in the formation preferably comprises fitting a cubic polynomial in depth to the conductivity, or log of the conductivity, using a weighted linear least-squares method. The curve fit of the log data is performed a plurality of times on portions of the log data using a windowing method. This windowing method comprises moving a window across the log data at periodic increments, and performing the curve fit on the window of log data at the periodic increments as the window is moved across the log data. The method then determines inflection points of the log data after the curve fit for each of the windows. The method then selects bed boundaries from the inflection points of the curve-fit of the log data.
    • 94. 发明公开
    • Differential pressure test/bypass valve well tool
    • 与压力差测试或旁通阀的井下工具
    • EP0753646A3
    • 1999-06-23
    • EP96304854.1
    • 1996-07-01
    • HALLIBURTON COMPANY
    • Ringgenberg, Paul D.
    • E21B34/10
    • E21B34/101E21B34/103E21B2034/002
    • A well tool apparatus (40) comprises a tubular housing (56) and operating mandrel (58) each having autofill ports (74, 76) and bypass ports (128, 130) therein. The apparatus (40) also comprises a normally closed ball valve (96) rotatably disposed within the operating mandrel (58) preventing communication between the upper section (104) and the lower section (106) of the operating mandrel (58) such that internal pressure above the ball valve (96) greater than internal pressure below the ball valve (96) downwardly urges the operating mandrel (58) allowing pressure testing of the pipe string (32) above the ball valve (96) and such that internal pressure below the ball valve (96) greater than internal pressure above ball valve (96) upwardly urges the operating mandrel (58). The well tool (40) further comprises a lower mandrel (150) disposed within the tubular housing (56) below the operating mandrel (58) that communicates with the well bore (16) through rupture disk port (174) such that sufficient well bore pressure will upwardly urge the lower mandrel (150) allowing operating mandrel (58) to slide downward relative to the tubular housing (56) and lock therein.
    • 100. 发明公开
    • Downwhole packer apparatus and method of limiting packer element extrusion
    • Packervorichtung im Bohrloch und Verfahren zur Begrenzung der Extrusion eines Packerelements
    • EP0798445A2
    • 1997-10-01
    • EP96305709.6
    • 1996-08-02
    • HALLIBURTON COMPANY
    • Hushbeck, Donald F.Yuan, YushengDavison, Douglas W.
    • E21B33/12
    • E21B33/1293E21B33/1216
    • A downhole apparatus (102) for use in a wellbore comprises: a mandrel (14) having an axial centerline; a slip means (118) disposed on the mandrel for grippingly engaging the wellbore when set into position; at least one packer element (128) to be axially retained about the mandrel and located at a preselected position along the mandrel defining a packer element assembly; at least one packer element retainer shoe (150) made of a plurality of segments for axially retaining the or each packer element about the mandrel, the shoe segments further having a cavity (168) for accommodating at least a portion of at least one gap-spanning structural member (170) that is installable into the cavity; and means (152) for retaining the shoe segments in an initial position about the mandrel. The gap-spanning member is of such size and configuration to span a gap that forms between adjacent shoe segments upon the tool being set in the wellbore.
    • 用于井眼的井下装置(102)包括:具有轴向中心线的心轴(14); 设置在所述心轴上的滑动装置(118),用于在设置到位时与所述井筒夹紧地接合; 至少一个密封件元件(128)围绕所述心轴轴向保持并且沿着所述心轴定位在预定位置,所述预定位置限定封隔器元件组件; 至少一个封隔器元件固定器支架(150),其由多个用于将所述封隔器元件或每个封隔器元件围绕所述心轴保持的多个段构成,所述滑块段还具有空腔(168),用于容纳至少一个间隙 - 跨越可安装到空腔中的结构构件(170); 以及用于将鞋段保持在围绕心轴的初始位置的装置(152)。 间隙跨度构件具有这样的尺寸和构造,以跨越在工具设置在井筒中时在相邻的鞋段之间形成的间隙。