| 摘要 |
<p>A method and a casing centralizer system for centralizing a casing in a well bore before cementing of said casing in the well bore. The casing centralizer system comprises a casing centralizer and at least one trigger device which is capable of being conveyed with a fluid through the casing and up an annulus between the casing and the well bore. The casing centralizer comprises: at least one centralizing element which is, when the casing centralizer is mounted on the casing, movable in a radial or partially radial direction relative to the casing for engagement with the well bore; at least one actuator comprising an actuator device which is connected to the at least one centralizing element for effecting of radial or partially radial movement of the at least one centralizing element, an activator device which is signally connected to the at least one actuator, wherein the at least one trigger device and the activator device are electrically, magnetically or electro-magnetically cooperatively configured such that when the at least one trigger device passes by the activator device as the at least one trigger device is flowed through the casing or through the annulus, the activator device is triggered to generate a signal for actuation of the actuator device whereby the at least one centralizing element is moved radially or partially radially for engagement with the well bore.</p> |
