Subterranean well completion apparatus with flow assurance system and associated methods
    2.
    发明授权
    Subterranean well completion apparatus with flow assurance system and associated methods 有权
    具有流量保证系统和相关方法的地下井完井设备

    公开(公告)号:US06419018B1

    公开(公告)日:2002-07-16

    申请号:US09527799

    申请日:2000-03-17

    IPC分类号: E21B3600

    摘要: A subsea subterranean well completion has a tubing string with a portion that extends through a region of the completion exposed to temperatures sufficiently low to potentially create wax and/or hydrate deposits within the tubing string during pre-production or shut-down periods. In order to inhibit or remove the formation of these deposits, the well completion is provided with a flow assurance system operative to create a flow of heating fluid which is recirculated through the space between the tubing string portion and the well casing/production riser structure in a manner causing the heating fluid to flow along the outer side of the tubing string portion without previously or subsequently traversing the interior of the tubing string. The heat absorbed by the tubing string inhibits or removes wax and/or hydrate formation in production fluid therein without the previous necessity of using a chemical injection system to inject plug-inhibiting chemicals into the interior of the tubing string. The flow assurance system may also be used to recirculate or otherwise flow other contact fluids, such as corrosion inhibiting fluids or insulation blanket fluids, against the outer side of the tubing string.

    摘要翻译: 海底地下井完井具有管柱,其中一部分延伸通过暴露于足够低的温度的区域,以在预生产或关闭期间潜在地在管柱中产生蜡和/或水合物沉积物。 为了抑制或去除这些沉积物的形成,提供了一个流动保证系统,该系统可操作以产生加热流体的流动,该加热流体通过管柱部分和井套管/生产提升管结构之间的空间再循环 导致加热流体沿着管柱部分的外侧流动而不预先或随后穿过管柱的内部的方式。 油管柱吸收的热量在生产流体中抑制或去除蜡和/或水合物形成,而不需要使用化学注射系统将堵塞抑制化学品注入管柱内部。 流动保证系统还可用于循环或以其它方式流过其它接触流体,例如腐蚀抑制流体或隔热层流体,以抵抗油管柱的外侧。

    Using fluids at elevated temperatures to increase fracture gradients

    公开(公告)号:US06973977B2

    公开(公告)日:2005-12-13

    申请号:US10639137

    申请日:2003-08-12

    申请人: Carey J. Naquin

    发明人: Carey J. Naquin

    IPC分类号: E21B20060101 C09K7/00

    CPC分类号: E21B21/08 E21B21/06 E21B36/00

    摘要: A method for drilling a wellbore in a formation using a drilling fluid, wherein the drilling fluid has a first temperature, and wherein the wellbore has a first wellbore depth. In one embodiment, the method comprises determining at least one fracture gradient, wherein the fracture gradient is determined at about the first wellbore depth; increasing the temperature of the drilling fluid from the first temperature to a desired temperature at about the first wellbore depth; drilling into the formation at increasing wellbore depths below the first wellbore depth, wherein at least one equivalent circulating density of the drilling fluid is determined at about the first wellbore depth; and setting a casing string at a depth at which the equivalent circulating density is about equal to or within a desired range of the fracture gradient. In other embodiments, an automated system is used to maintain the temperature of the drilling fluid at about first wellbore depth.