A gas-proof and corrosion-proof connection method for lead-sheathed submersible cables

Abstract

The invention relates to a gas-preventing and corrosion-preventing connection method for a lead sheath oil-submersible cable. The gas-preventing and corrosion-preventing connection method mainly solves the problem that the service of the oil-submersible cable is lowered caused by connecting place corrosion due to frequent blow-by and bulging used in gas-containing oil wells. The gas-preventing and corrosion-preventing connection method for the lead sheath oil-submersible cable is characterized by comprising the following steps: (1) removing an external armored skin, a lead sheath and an insulation layer from the cable; (2) connecting large and small flat cables; (3) wrapping lead sheath: lap jointing and wrapping through a lead belt from the position of the lead sheath at one end of the cable to the 1 / 2 position of the lead sheath at the other end of the cable; after finishing the wrapping, winding and tightening the outer surface of the lead belt wrapper by cloth, and wrapping two layers of lead belts by the same method; and (4) wrapping tetrafluoride insulated rubber tape and glass fiber rubber tape on each phase of the whole lead belt wrapping layer separately; then wrapping the overall three-phase cable by the tetrafluoride insulated rubber tape and the glass fiber rubber tape, and finally armoring the armored skin. By adoption of the method, the whole oil-submersible cable, including the connection place, can be protected by the lead layer, so that the service life of the oil-submersible cable used in gas-containing oil wells is prolonged.

Description

technical field [0001] The invention belongs to the technical field of application of oil production equipment in oilfields, in particular to a gas-proof and corrosion-proof connection method for lead-sheathed submersible cables. Background technique [0002] The existing lead-sheathed submersible cable connection technology is the same as the ordinary submersible cable connection method. The two sections of submersible cable conductors are connected by crimping sleeves. In order to avoid thickening of the submersible cable connection parts, the connection points of the three-phase conductors are staggered respectively. First wrap several layers of F46 insulating tape on each conductor and crimping sleeve, then wrap several layers with PTFE insulating tape, then wrap each phase cable with glass cloth tape, and finally wrap the three-phase cable with glass cloth tape Put them together and cover them with armor to complete the entire cable connection. The disadvantage of the ...

AI Technical Summary

Problems solved by technology

The shortcomings of the existing technology are that when the oil well contains gas, the connection part is not protected by a lead layer, which often causes the connection part of the submersible cable to bulge and corrode, which affects the connection quality and reduces the life of the cable.