Methods and compositions for forming permeable cement sand screens in well bores
    115.
    发明授权
    Methods and compositions for forming permeable cement sand screens in well bores 有权
    在井眼中形成渗透性水泥砂筛的方法和组合物

    公开(公告)号:US06364945B1

    公开(公告)日:2002-04-02

    申请号:US09736513

    申请日:2000-12-13

    IPC分类号: C04B2000

    CPC分类号: E21B43/08

    摘要: Methods and compositions for forming permeable cement sand screens in well bores are provided. The compositions are basically comprised of a hydraulic cement, an acid soluble particulate solid, a liquid hydrocarbon solvent soluble particulate solid, a particulate cross-linked gel containing an internal breaker which after time causes the gel to break into a liquid, water present in an amount sufficient to form a slurry, a gas present in an amount sufficient to form a foam and a mixture of foaming and foamed stabilizing surfactants.

    摘要翻译: 提供了在井眼中形成渗透性水泥砂筛的方法和组合物。 组合物基本上由水硬性水泥,酸溶性颗粒固体,液体烃溶剂可溶性颗粒固体,含有内部破碎剂的颗粒状交联凝胶组成,其在时间使凝胶破裂成液体后,存在于 足以形成浆料,以足以形成泡沫的量存在的气体和发泡和泡沫稳定表面活性剂的混合物。

    Method and apparatus for accurate synchronization using symbol decision
feedback
    117.
    发明授权
    Method and apparatus for accurate synchronization using symbol decision feedback 失效
    使用符号决策反馈进行精确同步的方法和装置

    公开(公告)号:US6130920A

    公开(公告)日:2000-10-10

    申请号:US76992

    申请日:1998-05-13

    CPC分类号: H04L7/0062 H04L7/042

    摘要: A circuit (12) for symbol decision directed feedback synchronization includes a current synchonization clock (45) that provides an initial sampling point and selects a detector corresponding to a current symbol decision. The circuit further includes a plurality of detectors (31, 32, 33, and 34) including the detector corresponding to the current symbol decision, a buffer (736) for storing the output of the detector corresponding to the current symbol decision and a processor (300) for seeking within a predetermined window about the initial sampling point for an optimum phase value to provide an adjustment signal which is used by the processor to adjust a subsequent symbol's sychronization clock to provide an optimal sampling point.

    摘要翻译: 用于符号决定定向反馈同步的电路(12)包括提供初始采样点并选择对应于当前符号判定的检测器的当前同步时钟(45)。 电路还包括多个包括与当前符号决定相对应的检测器的检测器(31,32,33和34),用于存储与当前符号判定相对应的检测器的输出的缓冲器(736) 300),用于在关于初始采样点的预定窗口内寻找最佳相位值,以提供由处理器用于调整后续符号的同步时钟以提供最佳采样点的调整信号。

    Method for over-the-air synchronization adjustment in a communication
system
    118.
    发明授权
    Method for over-the-air synchronization adjustment in a communication system 失效
    通信系统中空中同步调整方法

    公开(公告)号:US6014376A

    公开(公告)日:2000-01-11

    申请号:US715508

    申请日:1996-09-18

    IPC分类号: H04B7/26 H04L7/08 H04J3/06

    CPC分类号: H04B7/2696 H04L7/08

    摘要: A method for synchronizing base stations (104, 106, 108, 110) or radio ports in a communication system (100) such as a cordless or cellular telephone system uses a mobile station (114) or handset for synchronizing unsynchronized base stations. The mobile station (114) is first synchronized to a reference base station. The mobile station (114) then initiates communication with the unsynchronized base station and calculates a synchronization adjustment. The mobile station (114) transmits the synchronization adjustment to the unsynchronized base station which uses the synchronization adjustment to adjust its time base.

    摘要翻译: 一种用于同步诸如无绳或蜂窝电话系统的通信系统(100)中的基站(104,106,108,110)或无线电端口的方法使用移动台(114)或手持机来同步非同步的基站。 移动台(114)首先与参考基站同步。 然后,移动站(114)发起与非同步基站的通信,并计算同步调整。 移动站(114)将同步调整发送到使用同步调整的不同步基站来调整其时基。

    Methods of preventing well fracture proppant flow-back
    119.
    发明授权
    Methods of preventing well fracture proppant flow-back 失效
    防止井下支撑剂流回的方法

    公开(公告)号:US5924488A

    公开(公告)日:1999-07-20

    申请号:US872912

    申请日:1997-06-11

    IPC分类号: E21B43/02 E21B43/267

    CPC分类号: E21B43/267 E21B43/025

    摘要: The present invention provides improved methods of placing proppant in fractures formed in a subterranean zone to prevent the subsequent flow-back of the proppant with fluids produced from the zone. The methods are basically comprised of the steps of depositing a mixture of hardenable resin composition coated proppant and uncoated proppant in the fractures and then causing the resin composition to harden into stationary permeable masses in the fractures.

    摘要翻译: 本发明提供了将支撑剂置于地下区域形成的裂缝中的改进方法,以防止由该区域产生的流体随后流动支撑剂。 所述方法基本上包括以下步骤:将可硬化树脂组合物涂覆的支撑剂和未涂覆的支撑剂的混合物沉积在裂缝中,然后使树脂组合物在裂缝中硬化成固定的可渗透物质。