A vibration assembly of a drilling tool for drilling a wellbore penetrating a subterranean formation is disclosed. The downhole drilling tool includes a drill string, a bottomhole assembly and a drill bit. The vibration assembly includes a housing (334a) operatively connectable to the bottomhole assembly, expanders (122) positionable in the housing and radially extendable and retractable thereabout, and a radial vibrator (comprising mandrel (446), enlarger spring (48), cam portion (458) and vibration spring (570) operatively connectable to the expanders to vibrationally move the expanders against the wall of the wellbore whereby movement of the downhole tool is altered during drilling.

A modular reamer for use in a wellbore comprises an uphole end member, a center member, and a downhole member, with reamer sleeves that removably slides over a sleeve mounting portion of the center member or one of the end members, and are held between the end members and the center members when assembled into a downhole tool. The reamer sleeves may be positioned at any desired rotational angle relative to each other and are prevented from rotational movement relative to the center member by spines or keys formed on the mating surfaces of the reamer sleeves and corresponding members of the modular eccentric reamer.

An apparatus for cutting into a subterranean formation includes a body and multiple cutting blades distributed around a circumference of the body. The cutting blades are configured to cut into the subterranean formation in response to being rotated. Each cutting blade includes a ball embedded in the respective cutting blade. At least a portion of the ball protrudes towards the subterranean formation from the respective cutting blade in which the ball is embedded. Each ball is configured to roll against the subterranean formation to reduce friction while the cutting blades are rotating.

A rotary tool for operation within an underground wellbore or within tubing in a wellbore has at least one force-sensitive element attached to the tool body and positioned to contact the conduit wall, wherein the force-sensitive element comprises an outer portion to contact the wellbore or tubing wall, at least one connecting portion which is more compliant than the outer portion and through which the outer portion is connected to the tool body, and at least one sensor responsive to force on the outer portion transmitted through the force-sensitive element to the tool body. The sensors may resolve forces into measurable forces on three axes. Possible rotary tools include drill bit, reamer, mill, stabilizer and rotary steerable system for a drill bit.

Systems and methods for drilling a subterranean well include a reduced differential sticking drilling collar. The reduced differential sticking drilling collar is an elongated tubular member having a minimum outer diameter at an uphole end and at a downhole end. A collar body is located between the uphole end and the downhole end. The collar body has a cross section of alternating lobes and troughs. The collar body has a maximum outer diameter that is larger than the minimum outer diameter. A taper section extends from the minimum outer diameter to the maximum outer diameter. The lobes of the collar body wind along an entire axial length of the collar body in a spiral pattern.

Systems and methods for drilling a subterranean well include a reduced differential sticking drilling collar. The reduced differential sticking drilling collar is an elongated tubular member having a minimum outer diameter at an uphole end and at a downhole end. A collar body is located between the uphole end and the downhole end. The collar body has a cross section of alternating lobes and troughs. The collar body has a maximum outer diameter that is larger than the minimum outer diameter. A taper section extends from the minimum outer diameter to the maximum outer diameter. The lobes of the collar body wind along an entire axial length of the collar body in a spiral pattern.

A belling auger includes a rotatable shaft, a main shaft extending through the rotatable shaft, a sliding sleeve mounted on the main shaft a bottom panel and a shovel rotatably attached to the rotatable shaft. Pressing the rotatable shaft down towards the sliding sleeve causes the shovel to hinge outward at the bottom of a piling hole. As the device rotates the shovel scoops dirt onto the pan, thus widening the bottom of the hole to a bell or cone shape.

A belling auger includes a rotatable shaft, a main shaft extending through the rotatable shaft, a sliding sleeve mounted on the main shaft a bottom panel and a shovel rotatably attached to the rotatable shaft. Pressing the rotatable shaft down towards the sliding sleeve causes the shovel to hinge outward at the bottom of a piling hole. As the device rotates the shovel scoops dirt onto the pan, thus widening the bottom of the hole to a bell or cone shape.

The invention discloses an anchor rod multi-section reaming machine tool and an application thereof. The machine tool is used cooperatively with an anchor rod drill rig (M), wherein a hydraulic cylinder (41) is connected with a hydraulic station (1) through a pipe, and the hydraulic cylinder (41) is fixed at a lower end of a drill rod (M1) of the anchor rod drill rig (M) and connected with the hydraulic station (1). A piston (412) is arranged inside a cylinder body (411) of the hydraulic cylinder (41) and axially moves relative to the cylinder body (411) such that the cylinder body (411) is divided into a hydraulic cylinder upper chamber (4111) and a hydraulic cylinder lower chamber (4112) which have variable volume. An upper end of a piston rod (413) is fixed at a lower portion of the piston (412) and a lower end of the piston rod (413) is fixed at an upper portion of an arch pressing device fixing disc (42); and an arch pressing device (43) comprises a pair of upper arch arms (431) and a pair of lower arch arms (432), upper ends of the upper arch arms (431) are rotatably connected with a central position of a lower portion of the arch pressing device fixing disc (42), lower ends of the upper arch arms (431) are rotatably connected with upper ends of the lower arch arms (432), and lower ends of the lower arch arms (432) are rotatably connected with a central position of an upper portion of a base plate (44). The machine tool can perform multi-site variable-section reaming at different positions and improve the anti-pull-out property of an anchor rod.

Latchable casing while drilling systems and methods are disclosed. Some system embodiments include a casing string including an upper latch apparatus and a lower latch apparatus. The system also includes a bottom hole assembly (BHA) latched into the lower latch apparatus for steerable drilling, the BHA configured to latch into the upper latch apparatus for enlarging a rat hole.