Abstract: A wellbore tractor is provided. The wellbore tractor includes a single hydraulic line and at least one valve disposed along the single hydraulic line. At least two pairs of drives hydraulically coupled with the single hydraulic line such that the single hydraulic line can control the drives to open and/or close. A valve can be disposed along the single hydraulic line between each pair of drives. By controlling the opening and/or closing of each valve, along with controlling the inflow or removal of fluid in the hydraulic line, each pair of drives can be individually controlled to maneuver the wellbore tractor.

Abstract: Apparatus and methods for improved fluid sampling are disclosed. A sampling bottle for collection of a fluid sample comprises concentrically arranged first, second and third sampling containers (304A, 304B, 304C). First, second and third check valves (311, 312, 314) regulate flow of the sampling fluid from outside the sampling bottle into the first sampling container, and into the second and third sampling container.

Abstract: Apparatus and methods for improved fluid sampling are disclosed. A sampling bottle for collection of a fluid sample comprises concentrically arranged first, second and third sampling containers (304A, 304B, 304C). First, second and third check valves (311, 312, 314) regulate flow of the sampling fluid from outside the sampling bottle into the first sampling container, and into the second and third sampling container.

Abstract: An air bag having a first monolithic layer and a second monolithic layer, said first and second monolithic layer being attached to each other along a closed line such that the surface area of the first monolithic layer within the closed line is larger than the surface area of the second monolithic layer within said closed line. The first monolithic layer and the second monolithic layer define a fluid chamber bounded by said closed line, wherein the first monolithic layer rests on the second monolithic layer, and is of an at least substantially corrugated shape when said fluid chamber is deflated. The air bag also includes at least one fluid port in fluid communication with the fluid chamber.