The utility model discloses a controllable formula is from expandable casing subsidy pipe in pit, including subsidy pipe body and controllable formula downhole tool release, subsidy pipe body comprises rubber inner bag, memory alloy ring, leaking stoppage packing element, and leaking stoppage packing element's internal surface passes through the temperature resistant adhesive with the surface of rubber inner bag and bonds, controllable formula downhole tool release at least including a temperature controller, cable, heat pipe, the wire winding of generating heat, stainless steel protection tube, thermocouple, right spacing an of section of thick bamboo, toper, the stainless steel protection tube is located the inside of rightting a section of thick bamboo, and the heat pipe is located the inside of stainless steel protection tube, and the wire winding of generating heat is evenly twined in the outside of heat pipe, and the thermocouple is fixed on the inner wall of rightting a section of thick bamboo, the thermocouple passes through the cable electricity with the temperature controller respectively with the wire winding of generating heat and is connected, subsidy pipe body cover is established outside rightting a section of thick bamboo, and the top of card at the spacing section of thick bamboo of toper. Need not just can accomplish the casing patching operation, convenient operation, construction safety through means such as hydraulic pressure expansion or gunpowder explosions.