Capsule type cable control head

Abstract

The invention discloses a capsule type cable control head, which comprises an internal capsule, an intermediate capsule and an external capsule, wherein the internal capsule, the intermediate capsule and the external capsule sequentially seal and wrap a cable from inside to outside; the external capsule is sealed and wrapped by a control head main body; and the control head main body is connected with a hydraulic bent joint and sealed by threads. The capsule type cable control head is a well head anti-blowout tool for an oil field. The tool is used for controlling the cable to enter a well and lift from the well in petroleum cable operation, and particularly controlling a fluid pressure in a special situation that a well head is required to be emergently closed after the cable enters the well, so a well blowout accident is effectively prevented, and construction safety is guaranteed. By interaction of the external capsule, the intermediate capsule and the internal capsule, the cable is sealed by radially pushing a capsule body under a hydraulic control pressure, so the cable can smoothly enter the well, and the dynamic sealing of the cable in a lifting and descending process can be realized. The capsule type cable control head has the characteristics of simple structure, small volume, light weight, convenience for use and maintenance, safety, reliability, economy and practicability, and is ideal equipment for preventing environmental pollution in pressurized cable operation in the oil field.

Description

technical field [0001] The invention relates to a wellhead blowout prevention tool for an oil field, in particular to a capsule type cable control head. Background technique [0002] Construction safety is an important condition for oilfield development. Whether it is drilling, cable or tubing transmission, perforation, logging and other construction operations, the preparation of wellhead control equipment is very important to ensure safety and successful production. At present, there are two types of cable control heads used in oil fields: packing type and filling type. The main principle is to squeeze the packing by manually adjusting the upper sealing pressure cap or relying on the force of the hydraulic piston to push the packing to fill from the axial direction. The material achieves the effect of sealing the wellhead cable. However, due to the axial extrusion of the packing, the deformation of the packing will be uneven, resulting in a rapid decrease in the sealing s...

AI Technical Summary

Problems solved by technology

However, due to the uneven deformation of the packing due to the axial extrusion of the packing, the sealing specific pressure of the packing that is farther away from the point of the extrusion force decreases rapidly, thereby affecting the sealing effect, and the downhole operation The cables are subject to uneven friction during dynamic operation in a sealed state, resulting in severe wear and affecting the service life of the control head; in addition, the process of cables passing through the packing is very complicated, which brings difficulties to the construction, thus affecting the construction schedule

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