A downhole controllable self-expanding casing supplementary pipe

Abstract

The invention relates to an underground controllable self-expansion casing patching pipe which comprises a patching pipe body and a controllable underground tool release device. The patching pipe body is composed of a rubber inner container, a memory alloy ring and a leaking stoppage rubber barrel. The inner surface of the leaking stoppage rubber barrel and the outer surface of the rubber inner container are adhesively connected through a temperature resistance adhesive. The controllable underground tool release device at least comprises a temperature controller, a cable, a heat pipe, a heating winding wire, a stainless steel protective pipe, a thermocouple, a centering barrel and a conical limiting barrel. The stainless steel protective pipe is located inside the centering barrel. The heat pipe is located inside the stainless steel protective pipe. The heating winding wire is evenly wound around the heat pipe. The thermocouple is fixed to the inner wall of the centering barrel. The thermocouple and the heating winding wire are electrically connected with the temperature controller through the cable. The centering barrel is sleeved with the patching pipe body which is clamped to the top of the conical limiting barrel. Casing patching work can be completed without hydraulic expansion or gunpowder explosion or other means, operation is convenient, and construction is safe.

Description

technical field [0001] The invention relates to the technical field of oil well casing repair, in particular to an underground controllable self-expanding casing subsidy pipe. Background technique [0002] After the casing of oil and water wells is damaged due to various reasons, formation water flows back into the oil layer, causing problems such as shutting down of oil and water wells, damage to well pattern and failure to recover remaining oil, which is an important factor affecting the normal production of oil wells. [0003] Many oilfields in the United States and Middle East oil-producing countries began to suffer from casing corrosion and damage since the 1950s. The main control measures adopted include pipe expansion subsidies, sidetracking, and mechanical water shutoff. Since the 1970s, oil fields such as Jilin, Jianghan, Daqing, and Changqing in my country have successively experienced casing damage caused by casing deformation, salt rock creep, and electrochemical...

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: (1) When the hydraulic expansion cone moves forward, the point of force must be fixed on the inner wall of the casing, and its anchor fluke will cause new damage to the casing

(2) The hydraulic cold extrusion expansion device is relatively complicated, and it is prone to problems during construction, so that the expansion cone is stuck in the subsidy pipe, which can neither be pulled out nor continued to expand and advance, causing downhole accidents

(3) This method has complex procedures, high cost, short subsidy period, and high construction risk

The disadvantages of this method are (1) The energy generated by the explosion is difficult to control, if it is too small, the purpose of subsidy cannot be achieved, and if it is too large, the casing will be deformed or damaged

(2) Fires in oil wells are very dangerous. Once associated gas exists, major safety accidents such as oil well fires are likely to occur

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