The invention relates to a double-stage self-sealing
thermal recovery packer which is a down-hole tool for heavy oil
thermal recovery and comprises an
upper joint, an upper sheath, an upper sealing sleeve, an upper central tube, expansion
solid, a lower sheath, an inner cone, a lower sealing sleeve, a combined slider, an upper
piston, a lower
piston, a cylinder and a lower central tube. The
upper joint, the upper central tube, the inner cone and the lower central tube are sequentially connected with one another in a threaded manner from top to bottom, the upper sheath is connected onto the
upper joint, the upper sealing sleeve is arranged in the upper sheath, the corresponding expansion
solid is filled in the upper sealing sleeve, the lower sheath is respectively connected with the upper sealing sleeve and the lower sealing sleeve in an interference manner, the lower sheath and the lower sealing sleeve are sleeved on the inner cone, the cylinder is connected with the lower central tube in a threaded manner, the combined slider, the upper
piston and the lower piston are sequentially arranged inside the cylinder from top to bottom, and the corresponding expansion
solid is arranged between the upper piston and the lower piston. The double-stage self-sealing
thermal recovery packer is of a double-stage sealing structure, accordingly, thermodynamic automatic setting and hydraulic-assisted setting effects can be realized, and the double-stage self-sealing thermal
recovery packer has the advantages of short
setting time, durability in setting, good sealing performance, smooth unsetting and the like.