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Decoupling Conductor from Armor in High-Strength, High-pressure Marine Seismic Gun Cable

IP.com Disclosure Number: IPCOM000228681D
Publication Date: 2013-Jun-28
Document File: 5 page(s) / 585K

Publishing Venue

The IP.com Prior Art Database

Abstract

Air gun cables are an integral part of offshore seismic oil exploration. These cables serve to: • Pull the gun arrays through the water • Provide high-pressure air to the guns that produce the sound waves • Transmit electrical power and telemetry signals to control the array These cables are subjected to extreme stresses from tension, bending and internal air pressure that can lead to individual component failure or failure of the entire cable. The design described in this document is for an air gun cable with layers of aramid yard that provide allow some movement between the individual layers of the cable. The protective layers absorb external or internal pressures without harming cable components.

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Page 01 of 5

Page 1 of 5

Title of Invention: Decoupling Conductor from Armor in High-Strength, High-pressure Marine Seismic Gun Cable

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Page 02 of 5

Page 2 of 5 Air gun cables are an integral part of offshore seismic oil exploration. These cables serve to:
 Pull the gun arrays through the water
 Provide high-pressure air to the guns that produce the sound waves  Transmit electrical power and telemetry signals to control the array

These cables are subjected to extreme stresses from tension, bending and internal air pressure that can lead to individual component failure or failure of the entire cable. The design described in this document is for an air gun cable with layers of aramid yard that provide allow some movement between the individual layers of the cable. The protective layers absorb external or internal pressures without harming cable components.

2Prior Art

Currently, gun cables typically consist of a reinforced air hose at the center surrounded by several small insulated conductors, fiber optic elements and pneumatic tubes (see Figure 1). The cables are completed with two layers of counter-helically applied strength members encased in a polymeric jacket. Due to the presence of the air hose at their centers, the conductors in gun cables are subject to shifting stresses at different times. When under tension, the strength members can constrict against the conductors. When air pressure (up to 2,000 psi) is applied to the air hose similar pressure can be exerted on the conductors from the inside. These pressures can occur separately or together. When they occur in tandem, extremely high friction is exerted on the conductors. Due to their construction, the pneumatic tubes and fiber optic elements are able to deform to a greater extent than the insulated electrical conductors. Because the electrical conductors do not deform, they tend to fail first. With repeated cycles of stress, the other elements would be likely to fail as well.

Figure 1 Conventional DAG cable

3Summary of the Invention

The designs in this document use protective aramid yarn layers or caged armor layers to provide protection for conductors against damage caused by impact forces, interior or external pressure and bending forces. The cable can go through a much higher tension and pressure without any conductor failure.

1Introduction

Insulated electrical conductors

Fiber-optic component

Central air hose containing up to 2,000 psi

Pneumatic tube

Strength member layers


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4Detailed Description of the Invention Including Examples and Drawings


4.1Gun cable with protective aramid yarn layers

As shown in Figure 2, the design is for a gun cable with one, two or three protective layers of aramid yarn incorporated between cable layers. A layer of yarn can be placed inside or outside the conductor layer. Or both layers of yarn can be placed at the same time. These yarn layers...