Abstract: A cutter element for an earth-boring tool, comprising a polycrystalline diamond (PCD) volume joined at an interface boundary to a cemented carbide substrate. The PCD volume includes a rake face opposite the interface boundary, an edge of the rake face being suitable as a cutting edge of the cutter element. The PCD volume comprises a plurality of strata directly joined to each other at inter-strata boundaries, in which each of a first plurality of the strata comprises PCD material having a first diamond content; each of a second plurality of the strata comprises PCD material having a second diamond content; the second diamond content being greater than the first diamond content; and the strata of the first and second pluralities disposed in an alternating arrangement with respect to each other.

Abstract: A cutter element for an earth-boring tool, comprising a polycrystalline diamond (PCD) volume joined at an interface boundary to a cemented carbide substrate. The PCD volume includes a rake face opposite the interface boundary, an edge of the rake face being suitable as a cutting edge of the cutter element. The PCD volume comprises a plurality of strata directly joined to each other at inter-strata boundaries, in which each of a first plurality of the strata comprises PCD material having a first diamond content; each of a second plurality of the strata comprises PCD material having a second diamond content; the second diamond content being greater than the first diamond content; and the strata of the first and second pluralities disposed in an alternating arrangement with respect to each other.

Abstract: A cutting element configured to mitigate spalling on a front cutting face thereof. The cutting element include a diamond table having the front cutting face defined thereon and at least one recess defined on the front cutting face of the diamond table. The at least one recess has a width within a range of 25.0 ?m to 650 ?m and a depth within a range of 25.0 ?m to 600 ?m. Methods of forming a cutting element configured to mitigate spalling on the front cutting face thereof. The methods including forming at least one recess on a front cutting face of a diamond table to have a width within a range of 25.0 ?m to 650 ?m and a depth within a range of 25.0 ?m to 600 ?m. Method of using a cutting element configured to mitigate spalling on the front cutting face thereof.

Abstract: A cutting element configured to mitigate spalling on a front cutting face thereof. The cutting element include a diamond table having the front cutting face defined thereon and at least one recess defined on the front cutting face of the diamond table. The at least one recess has a width within a range of 25.0 ?m to 650 ?m and a depth within a range of 25.0 ?m to 600 ?m. Methods of forming a cutting element configured to mitigate spalling on the front cutting face thereof. The methods including forming at least one recess on a front cutting face of a diamond table to have a width within a range of 25.0 ?m to 650 ?m and a depth within a range of 25.0 ?m to 600 ?m. Method of using a cutting element configured to mitigate spalling on the front cutting face thereof.

Abstract: A drilling system that includes a bit body that has a longitudinal axis, a blade of a selected length on a side of the bit body and substantially along the longitudinal axis, and a movable member associated with the blade that extends from a retracted position to a selected extended position along the longitudinal axis, thereby effectively extending the length of the blade when the movable member is in the selected extended position.

Abstract: In one aspect, a drill bit is disclosed that in one embodiment includes a bit body that has a longitudinal axis, a blade of a selected length on a side of the bit body and substantially along the longitudinal axis, and a movable member associated with the blade that extends from a retracted position to a selected extended position along the longitudinal axis, thereby effectively extending the length of the blade when the movable member is in the selected extended position.