Downhole communication
First Claim
1. A system for use in determining a relative position of first and second parts of a downhole arrangement, the system comprising:
- a plurality of indicator elements having a predetermined spatial arrangement relative to the first part of the downhole arrangement, each indicator element capable of providing a distinct electromagnetic field; and
a sensor element which is capable of sensing respective electromagnetic fields coupled from each of the indicator elements; and
a stimulator element for stimulating each of the indicator elements so as to provide the respective electromagnetic fields,wherein the second part of the downhole arrangement is configured to selectively slide to extend between the sensor element and one or more of the indicator elements according to the relative position of the first and second parts of the downhole arrangement.
11 Assignments
0 Petitions
Accused Products
Abstract
A system or apparatus for use in downhole communication or detection comprises a downhole arrangement defining a throughbore and primary and secondary elements. One of the primary and secondary elements is provided on the downhole arrangement and the other of the primary and secondary elements is provided in the throughbore. The primary and secondary elements are configurable for coupling of an electromagnetic field therebetween. The primary or secondary element which is provided in the throughbore may be provided on a tool such as a shifting tool which is deployable through the throughbore. The secondary element may be configured to provide the electromagnetic field coupled between the first and second elements with one or more characteristic features. The system may be configured for use, in particular though not exclusively, for communicating information to and/or from a downhole tool in an oil or gas well.
36 Citations
13 Claims
-
1. A system for use in determining a relative position of first and second parts of a downhole arrangement, the system comprising:
-
a plurality of indicator elements having a predetermined spatial arrangement relative to the first part of the downhole arrangement, each indicator element capable of providing a distinct electromagnetic field; and a sensor element which is capable of sensing respective electromagnetic fields coupled from each of the indicator elements; and a stimulator element for stimulating each of the indicator elements so as to provide the respective electromagnetic fields, wherein the second part of the downhole arrangement is configured to selectively slide to extend between the sensor element and one or more of the indicator elements according to the relative position of the first and second parts of the downhole arrangement. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A method for use in determining a relative position of first and second parts of a downhole arrangement, the method comprising:
-
providing a distinct electromagnetic field from each indicator element of a plurality of indicator elements, the plurality of indicator elements having a predetermined spatial arrangement relative to the first part of the downhole arrangement; stimulating each of the indicator elements so as to provide respective electromagnetic fields; sensing the respective electromagnetic fields coupled from each of the indicator elements to a sensor element; and selectively sliding the second part of the downhole arrangement to extend the second part of the downhole arrangement between the sensor element and one or more of the indicator elements according to the relative position of the first and second parts of the downhole arrangement.
-
Specification