A load-bearing detection cable for oil and gas wells

Abstract

The invention relates to the technical field of transmission cables, and discloses a load-bearing detection cable for an oil-gas well. The load-bearing detection cable for an oil-gas well comprises aprotective sleeve, an outer layer forward steel wire, a lubricating layer, an inner layer reverse steel wire, a sheath layer, an insulating layer and a conductor. The outer layer forward steel wire coats the internal portion of the protective sleeve, the lubricating layer coats the internal portion of the outer layer forward steel wire, the inner layer reverse steel wire coats the internal portionof the lubricating layer, the sheath layer coats the internal portion of the inner layer reverse steel wire, the inner layer reverse steel wire contracts to the outside, at the same time, the inner layer reverse steel wire drives the steel wire to revolve under the counter-acting force of the force to allow the outer layer forward steel wire to begin revolve, and through the reverse spiral connection between the two, and the reaction force of reuse power acts on the steel wire, no matter what angle the steel wire is rotator, the steel wire can return to the initial state to allow the steel wire to be in a closed state so as to increase the bearing intensity of the cable during use and allow the cable to keep the stable state in the use process.

Description

technical field [0001] The invention relates to the technical field of transmission cables, in particular to a load-bearing detection cable for oil and gas wells. Background technique [0002] Load-bearing detection cables are suitable for oil mine detection cables that bear mechanical loads for electrical measurement. This type of cable is used for well logging, perforation, coring and other operations of various oil and gas wells; it can also be used for marine surveys, rivers, harbors, water conservancy, etc. , hydrological survey, coal field geological exploration, geothermal logging, etc., as a connecting line for heavy-duty instrument measurement. [0003] The purpose of well logging cable logging is to detect various downhole parameters. The important function of well logging cable is to transport various downhole instruments, transmit various signals between the ground control system and downhole instruments, and obtain the depth position of downhole information. ...

AI Technical Summary

Problems solved by technology

[0004] The external structure of the existing load-bearing detection cable is composed of an outer layer of steel wire and an inner layer of steel wire. When the load-bearing detection cable is measured in a downhole, because the surface of the load-bearing detection cable is made of steel wire, it is affected by the environment and equipment in the well, and the steel wire is worn during use. The phenomenon that the steel wire wears a quarter of the force value of the outer armor wire decreases by 23.9%, the force value of the inner armor wire decreases by 31.08%, and the steel wire wears a third of the force value of the outer armor wire. 35.32%, the force value decrease rate of the inner armor steel wire is 52.21%, the force value decrease rate of the outer armor steel wire is 48.28%, and the force value decrease rate of the inner armor steel wire is 72.43%, speeding up the durability of the cable , and the cable is pulled by the measuring equipment, the cable load is elongated and rotated for free rotation under the condition of stretching, because the two layers of armored steel wire are braided in a mesh or helical shape, resulting in a wider contact surface between the two , the steel wire and the steel wire are close to each other, resulting in a large frictional resistance between the two armored steel wires. When the cable is rotated, it is affected by the friction force, and the friction force will limit the free rotation of the cable, and the force on the steel wire is in the opposite direction. The direction of the armored steel wire is twisted, causing the inner and outer steel wires after cracking to be entangled together, and the degree of cracking is getting larger and larger (with the strength of the cable rotation), resulting in jumping and broken wires of the armored steel wire, and further causing the cable to automatically bend and accumulate. Pulling off the cable directly will affect the transmission of the cable signal

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