Differential sticking test fixture

A test fixture, comprising:

• a cylindrical main body configured to receive a test piece, the main body extending in a longitudinal direction and comprising:
• a cylindrical screen filter disposed within the main body and extending in the longitudinal direction along an axis coincident with an axis of the main body, the screen filter having a mesh surface configured to generate a filter cake when particle-entrained fluid is supplied therethrough, and
• an offset shaft extending in the longitudinal direction along an offset axis that is offset from the axis of the main body when the offset shaft is actuated, wherein the test piece extends through the offset shaft,
• a bearing configured to decouple rotational motion of the offset shaft from the main body,
• an actuator configured to dislodge the test piece from the filter cake within the main body,
• a computer configured to determine a force required to dislodge the test piece from the filter cake, and
• a reservoir pump configured to pump the particle-entrained fluid into the screen filter, thereby generating the filter cake,
• an alignment wheel configured to rotate the offset shaft, thereby forcing the test piece to move from a first position in which a longitudinal axis of the test piece is coincident to the longitudinal axis of the screen filter to a second position in which the longitudinal axis of the test piece is embedded in the filter cake, and
• wherein the reservoir pump is configured to circulate fluid through the screen filter while the test piece is in the second position, thereby creating a differential pressure that forces the test piece to translate within the filter cake to a resting position,
• wherein the test piece is disposed on an interior of the screen filter.