This invention relates to a tractor for use in a wellbore, an apparatus for use in the tractor and related methods. In one embodiment the apparatus has a body, a drive wheel and a movable arm for supporting drive wheel. The arm may be rotatably movable using an actuator such that the drive wheel can be extracted from the body and brought into engagement with a wall of the wellbore, and may be arranged to be offset from a central region of the apparatus for providing accommodation space for the actuator in the body.

A rotary actuator assembly can include a fluid motor with a rotor that displaces with hypocyclic precessional motion within a stator in response to fluid flow through the fluid motor, and a gear reducer section including an input gear that is fixed relative to the rotor and displaces with the hypocyclic precessional motion relative to an output gear. Another rotary actuator assembly can include a fluid motor with a rotor having a central longitudinal axis that rotates about a central longitudinal axis of a stator, and a gear reducer section including an input gear that rotates with the rotor and displaces relative to an output gear, and the input gear having the same central longitudinal axis as the rotor. A well system can include at least two fluid motors, and fluid flow through one fluid motor causes rotation of the other fluid motor in the well.

The present invention relates to a downhole wireline tool string for removing material of a component in a well downhole by an annular grinding area, the downhole wireline tool string having an axial extension and a centre tool axis, a front end and a top end connectable to a wireline, comprising an electric motor powered through the wireline for providing rotational output, a tool section for anchoring the downhole wireline tool string inside a well tubular metal structure, an operational tool rotated by the rotational output and defining the front end and an end surface arranged axially opposite the wireline and comprising an annular wall having a circumference and a wall thickness defined by an inner wall radius and an outer wall radius from the centre tool axis, wherein the operational tool comprises at least a first grinding section and a second grinding section arranged at the end surface, the first grinding section having an inner face being arranged at a first distance from the centre tool axis, the first distance being smaller than the inner wall radius, and the second grinding section having an outer face being arranged at a second distance from the centre tool axis, the second distance being greater than the outer wall radius.

An intervention system is provided. The intervention system comprises a cable being configured to be lowered into a wellbore, said cable having an inner tube enclosing one or more electrical conductors, and an outer tube surrounding the inner tube. The intervention system further comprises a downhole tool being connected to a distal end of the cable and being configured to pull the cable into the wellbore.

A wireline clean-out tool including a first opening and a second opening at or near a free-end portion. The first opening takes in debris from a wellbore, the second opening ejects fluid into the wellbore. A housing defines a first flow path from the first opening at the free-end portion to an opposite end portion of the housing and a second flow path from the opposite end portion to the second opening at the free-end portion. The flow paths couple with each other at the opposite end portion. A collection chamber is in the first flow path for collecting debris during operation. A progressive cavity pump with hollow rotors is placed inside the housing at a predefined distance from the free-end portion being configured for operating on the first flow path while the hollow rotor forms part of the second flow path.

The disclosed embodiments include well operation evaluation systems and methods to analyze a broomstick chart of a well operation. The method includes receiving data indicative of a well operation involving deploying a conveyance to a predetermined location. The method also includes determining one or more conditions that impact deployment of the conveyance to the predetermined location. The method further includes determining a likelihood of occurrence of the one or more conditions. The method further includes determining one or more operations which, when performed by one or more tools used during the well operation, overcome the one or more conditions.

Downhole tools with propulsion units are described herein. Perforation assemblies described herein have a perforation tool and a propulsion unit coupled to the perforation tool, the propulsion unit comprising an impeller and a protective structure disposed around the impeller.

Provided are compositions, methods, and systems that relate to downhole tractor wheels. A downhole tractor system comprising: tubular housing capable of being deployed downhole by wireline; plurality of wheels rotatably mounted to tubular housing, wheels having at least a portion of an outer surface comprising polymeric material. A method for conveying a downhole tool along an inner wall of a wellbore, the method comprising: disposing downhole tool coupled to downhole tractor within wellbore; providing energy to downhole tractor by way of wireline thereby rotating a wheel disposed on downhole tractor; frictionally engaging the inner wall of wellbore with wheel comprising polymeric material disposed on at least a portion of an outer surface of wheel thereby providing a compressive load between the inner wall of the wellbore and polymeric material; allowing downhole tractor to proceed along wellbore wall until downhole tractor reaches desired location; deploying downhole tool for use in wellbore.

An assembly and a method for maintaining and inspecting a wellbore are described. The assembly includes a body. Multiple magnetic wheel sub-assemblies are adjustably coupled to the body. The magnetic wheel sub-assemblies position the body within the wellbore and reposition relative to the body in response to a wellbore narrowing or a wellbore widening. The assembly includes a tool connection coupled to the body. The tool connection couples a well tool to the body. The assembly includes a control sub-assembly to control the magnetic wheel sub-assemblies and operate the well tool within the wellbore. The assembly includes a power sub-assembly to supply power to the control sub-assembly and the well tool. The assembly includes a backup retrieval mechanism coupled to the body. The backup retrieval mechanism couples to a retrieval tool.

A tool string arrangement (1) for displacement in a deviating wellbore (9) by a wireline operated tractor (2), said tool string arrangement (1) comprises a clean-out arrangement (4), the clean-out arrangement (4) comprises a rotational motor (40) provided with electrical energy through a wireline (21). The tool string arrangement (1) comprises a perforation arrangement (3) positioned between the wireline operated tractor (2) and the rotational motor (40). A method for using the tool string arrangement (1) is described.