Logging while drilling (LWD) mechanical calipers
AssigneeSchlumberger Technology Corporation
InventorsHiroshi Nakajima, Cong Wang
Life of this patent
Estimating the term…
Abstract
Logging while drilling (LWD) mechanical calipers are disclosed. An example apparatus to characterize a bore includes a drill collar, a sliding sleeve that moves longitudinally relative to the drill collar, and a sliding block operatively coupled to the sliding sleeve and movable relative to the drill collar. The example apparatus also includes a caliper arm operatively coupled to the sliding block, where the caliper arm is to displace radially outward towards an inner diameter of the bore based on movement of the sliding block, and a caliper sliding sensor to measure a movement of the sliding block.
Claims20
An apparatus to characterize a bore, the apparatus comprising:
- a drill collar;
- a sliding sleeve that moves longitudinally relative to the drill collar;
- a first sliding block operatively coupled to the sliding sleeve and movable relative to the drill collar;
- a second sliding block operatively coupled to the sliding sleeve and movable relative to the drill collar;
- a caliper arm having opposing ends operatively coupled to the first sliding block and the second sliding block, the caliper arm to displace radially outward towards an inner diameter of the bore based on movement of the first sliding block and the second sliding block;
- a first caliper sliding sensor to measure a first movement of the first sliding block;
- and
- a second caliper sliding sensor to measure a second movement of the second sliding block.
A method comprising:
- moving a caliper relative to a bore;
- moving a sliding sleeve of the caliper to expand a caliper arm operatively coupled to a first sliding block and a second sliding block, the caliper arm to displace radially outward towards an inner diameter of the bore based on movement of the first sliding block and the second sliding block, wherein opposing ends of the caliper arm are operatively coupled to the first sliding block and the second sliding block;
- and
- determining, by executing an instruction with a processor, a characteristic of the bore based on the movements of the first sliding block and the second sliding block.
A non-transitory machine readable medium comprising instructions, which when executed, cause a processor to at least:
- determine a movement of a sliding block of a caliper, the sliding block operatively coupled to a caliper arm of the caliper, wherein the caliper arm displaces radially outward towards an inner diameter of a bore based on movement of a sliding sleeve of the caliper;
- calculate a condition of the bore based on the movement of the sliding block;
- and
- determine a degree of cleaning needed for the bore based on the movement of the sliding block.
Dependencies are inferred from the claim text.