Abstract: A straddle packer is disclosed using two inflatable packing elements mounted on a mandrel. After the packing elements are inflated, the mandrel can be moved relative to the packing elements to various positions to sample, test, treat, etc. the formation. Resilient connecting means between the mandrel and the packer require a substantial force that is detectable at the surface to move the mandrel to another position. A pin and J-slot control the movement of the mandrel relative to the packer and limit the movement so that a substantial increase in force at the surface indicates that the mandrel is properly positioned.

Abstract: Apparatus is disclosed for operating a downhole tool, such as setting and unsetting a hook wall packer run into the production tubing of an oil or gas well on coiled tubing. The apparatus employs a pin moving in a groove to allow a packer to be run into the production tubing, set, and released by the longitudinal movement of the coiled tubing only.

Abstract: A tubing end locator is disclosed having a mandrel and a collet carried by the mandrel. The collet has an annular base and a plurality of fingers having one end attached to the base and a free end extending from the base along the mandrel in parallel, spaced relationship. A beveled lug is carried by the free end of each finger. A flange on the mandrel has a diameter such that the lugs on the fingers will extend beyond the inside diameter of the tubing when the free ends of the fingers are in engagement with the flange. Means hold the fingers in engagement with the flange and resist the re-entry of the fingers into the tubing after the tubing end locator has passed out of the tubing until a substantial upward force has been exerted on the mandrel thereby giving a surface indication that the tool had engaged the lower end of the tubing.

Abstract: Apparatus is disclosed for connecting the firing head of a downhole tool to a set of jars to allow the jars to jar up and jar down. The apparatus includes a firing head housing, a hammer located in the housing, and a spring urging the hammer toward a firing pin. A mandrel extends into the housing. It has one end connected to a jar and the other end connected to the hammer by a shear pin. The mandrel also has longitudinally spaced oppositely facing shoulders and one or more lock segments around the mandrel between the shoulders. The movement of the lock segments along the axis of the housing is limited and the lock segments engage the oppositely facing shoulders to limit axial movement of the mandrel relative to the housing in either direction when the pin is sheared and the hammer released to strike the firing pin.