INSERTABLE DEEP JACK FOR ELIMINATING DRILLING TOOL JAMS

The invention relates to the field of drilling oil and gas wells. The downhole hydraulic jack includes a body with connecting threads, a power hydraulic cylinder and a hollow barrel of the hydraulic jack with a hole for connecting the barrel cavity to the cylinder cavity. The body consists of upper and lower hollow cylinders. The wall of the lower part of the upper cylinder has a circular cylindrical recess, and the upper part of the lower cylinder is equipped with a projection of the same shape. The protrusion is located in the circular cylindrical recess, so that these elements form a closed hydraulic cylinder cavity. The outer surface of the protrusion is equipped along its entire length with four vertical splines placed in the grooves of the corresponding inner surface of the longitudinal cylindrical recess of the upper cylinder, through which the upper and lower cylinders of the housing are articulated with the possibility of mutual axial movement. The inner wall of the upper cylinder recess is equipped with a radial channel at the level of the end of the projection. Below the radial channel, the wall is equipped with four rectangular holes offset 45 degrees from the splines, where the cylinders are locked for longitudinal movement. In the lower cylinder protrusion opposite each rectangular hole, recesses of the same shape are made in which the spring springs are placed. The inner wall of the lower cylinder below the base of the projection is equipped with an annular recess with a retaining ring covered by a protective cage installed inside the housing and fixed with a shear pin in the lower cylinder above the lower end of the cage. The outer surface of the protective cage above the shear pin is equipped with a circular recess for the locking ring, and above it - four longitudinal grooves opposite the cylinder longitudinal movement locks, with the width of the groove exceeding the width of the lock, the lower base of each groove is located above the lock, and the upper base is located above the radial channel in the inner wall of the recess of the upper cylinder. The use of a deep jack allows to quickly eliminate tool seizure by creating a force directed from the bottom up, which does not require taking into account the tensile strength of the threaded connections of the elements that make up the drilling tool, and to avoid long and often unsuccessful recovery operations. Винахід належить до галузі буріння нафтових і газових свердловин. Свердловинний