Drilling jar for use in a downhole network
First Claim
1. A wired downhole drilling tool comprising:
- a housing;
a mandrel insertable into the housing, wherein the mandrel is axially translatable with respect to the housing;
a coiled cable, enclosed by the housing, having a first end connected to the housing and a second end connected to the mandrel, the coiled cable configured to elongate and shorten in accordance with axial movement between the housing and the mandrel;
a clamp effectively fixing the coiled cable with respect to at least one of the housing and the mandrel, to accommodate a change of tension in the coiled cable wherein the clamp increases its grip on the coiled cable in response to an increase in tension therein.
8 Assignments
0 Petitions
Accused Products
Abstract
Apparatus and methods for integrating transmission cable into the body of selected downhole tools, such as drilling jars, having variable or changing lengths. A wired downhole-drilling tool is disclosed in one embodiment of the invention as including a housing and a mandrel insertable into the housing. A coiled cable is enclosed within the housing and has a first end connected to the housing and a second end connected to the mandrel. The coiled cable is configured to stretch and shorten in accordance with axial movement between the housing and the mandrel. A clamp is used to fix the coiled cable with respect to the housing, the mandrel, or both, to accommodate a change of tension in the coiled cable.
135 Citations
24 Claims
-
1. A wired downhole drilling tool comprising:
- a housing;
a mandrel insertable into the housing, wherein the mandrel is axially translatable with respect to the housing;
a coiled cable, enclosed by the housing, having a first end connected to the housing and a second end connected to the mandrel, the coiled cable configured to elongate and shorten in accordance with axial movement between the housing and the mandrel;
a clamp effectively fixing the coiled cable with respect to at least one of the housing and the mandrel, to accommodate a change of tension in the coiled cable wherein the clamp increases its grip on the coiled cable in response to an increase in tension therein. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- a housing;
-
11. A method for wiring a downhole drilling tool having a housing and a mandrel insertable into the housing, wherein the mandrel is axially translatable with respect to the housing, the method comprising:
- connecting a first end of a coiled cable to the mandrel;
connecting a second end of the coiled cable to the housing, the coiled cable configured to elongate and shorten in accordance with axial movement between the housing and the mandrel;
fixing the coiled cable with respect to at least one of the housing and the mandrel, to accommodate a change of tension in the coiled cable such that the grip increases on the coiled cable in response to an increase in tension on the coiled cable. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
- connecting a first end of a coiled cable to the mandrel;
-
22. A wired downhole drilling tool comprising:
- a housing;
a mandrel insertable into the housing, wherein the mandrel is axially translatable but rotationally fixed with respect to the housing;
a cable coiled around the mandrel end enclosed by the housing;
a clamp effectively fixing the cable with respect to at least one of the housing and the mandrel, to accommodate a change of tension in the cable wherein the clamp increases its grip on the coiled cable in response to an increase in tension therein. - View Dependent Claims (23, 24)
- a housing;
Specification