Dual-functional breaker for hybrid fluids of viscoelastic surfactant and polymer

    公开(公告)号:US09243181B2

    公开(公告)日:2016-01-26

    申请号:US13749181

    申请日:2013-01-24

    Abstract: Incorporating water-based polymer breakers, such as oxidizers, enzymes and/or acids, into a mixture of an oil and oil-soluble surfactants creates an emulsion that can then perform as a dual-functional breaker for reducing the viscosity of hybrid fluids gelled with both a viscoelastic surfactant (VES) and a polymer. The outer phase of the dual-functional breaker emulsion is oil, e.g. a mineral oil, containing an oil-soluble surfactant that will, over time and with heat, break the VES portion of the gel. As it does so, the polymer breaker in the internal aqueous phase will be released to then break the polymer portion of the gel. The polymer breaker will not start to break the polymer gel before the oil-soluble surfactant starts to break the VES gel. The overall breaking using the emulsion is slower as compared to introducing the polymer breaker and the oil-soluble surfactant in a non-emulsified form.

    Watercut sensor using reactive media
    14.
    发明授权
    Watercut sensor using reactive media 有权
    使用反应介质的水切传感器

    公开(公告)号:US09091142B2

    公开(公告)日:2015-07-28

    申请号:US14173476

    申请日:2014-02-05

    CPC classification number: E21B47/00 E21B34/08 E21B47/06 E21B47/10 Y10T137/206

    Abstract: An apparatus for estimating a parameter of interest includes a conduit and a reactive media in the conduit. The reactive media interacts with a selected fluid component to control a flow parameter of the conduit. The apparatus also includes at least one sensor responsive to the flow parameter. The apparatus may be used for estimating a water content of a fluid flowing from a subterranean formation. The apparatus may include a flow path configured to convey fluid from the formation. The at least one sensor may be responsive to a pressure change in the flow path caused by interaction of the reactive media with water.

    Abstract translation: 用于估计感兴趣的参数的装置包括导管和导管中的反应性介质。 反应介质与选定的流体组分相互作用以控制导管的流动参数。 该装置还包括响应于流量参数的至少一个传感器。 该装置可以用于估计从地下地层流动的流体的含水量。 该装置可以包括构造成从地层输送流体的流路。 至少一个传感器可以响应由反应介质与水的相互作用引起的流动路径中的压力变化。

    High strength, operationally robust lost circulation preventative pseudo-crosslinked material

    公开(公告)号:US10138165B2

    公开(公告)日:2018-11-27

    申请号:US15472386

    申请日:2017-03-29

    Abstract: A formulation for use as a lost circulation preventive material is a cement-forming aqueous fluid comprising water, at least one viscoelastic surfactant (VES), at least one monovalent or multivalent salt, at least one magnesium powder, and at least one retarder. The formulation is used in a method of drilling into a subterranean formation that includes introducing into a wellbore passing at least partially through the subterranean formation the cement-forming aqueous fluid, and further increasing the viscosity of the aqueous fluid by the action of the VES forming elongated micelles; where the at least one monovalent salt is present in an amount effective to pseudo-crosslink the elongated VES micelles to further increase the viscosity of the aqueous fluid. The formulation further forms a cement by reacting the at least one magnesium powder and the water which reaction is retarded by the retarder. The water may be saline water.

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