In various sorts of wells, effectively operations, and so forth., an electric submersible pump (ESP) power cables and motor lead extensions (MLEs) could also be exposed to excessive temperatures and/or high focus of corrosive and sour gases and fluids. To guard a number of electrically insulated copper conductors, metallic lead (Pb) sheaths could be employed as a barrier layer to block permeation of downhole media. Measurements of temperature along the length of the effectively can provide for feedback, for example, to grasp situations downhole of an ESP. As an example, a power cable for a downhole application could embrace an extruded steady metallic lead (Pb) barrier layer that aims to protect supplies interiorly disposed thereto from downhole media comparable to, for example, one or more corrosive gases (e.g., consider CO2 and H2S). As an example, a tape can embody a number of lead (Pb) alloy layers and adhesive. In the geometry of the ability cable 702, three assemblies are shown where each assembly features a conductor 710 (e.g., a substantially pie formed conductor with an arc span of approximately one hundred twenty levels), insulation 730 (e.g., a substantially pie shaped layer of insulation that surrounds the conductor 710), a metallic shield 750 (e.g., a considerably pie shaped layer of lead (Pb) that surrounds the insulation 730, and a cushion layer 760 (e.g., a considerably pie shaped layer of fabric that surrounds the metallic shield 750. As shown, the three assemblies might be grouped (e.g., One hundred twenty degrees every to type a circular cross-part of 360 levels) and one or more additional layers can be applied that surrounds the three assemblies where one or more of such layers can include armor.

As such, where properly fluid contacts an EPDM insulation layer, injury may happen to the insulation resulting from swelling of the EPDM (e.g., which can apply strain that may mechanically damage a number of options of a cable). While one or more gasoline barrier layers might intention to be impermeable to gas migration from an exterior region to an interior region, injury could happen to a cable the place strain can build in an inside area that's interior to a gasoline barrier layer. Where fuel pressure builds in an inside region, that gas pressure can apply power to a gasoline barrier layer because the gasoline barrier layer is substantially impermeable to gas. To cut back this damage, as mentioned, a taped or braided fiber layer can be applied over a lead (Pb) layer to supply resistance to damage from the armoring process. Such an strategy could scale back cable weight, for example, when compared to cable weight for a cable that includes a number of metallic lead (Pb) layers as gasoline barrier layer or layers. For example, a tape might include one or more lead (Pb) alloy layers which may be of a thickness that's lower than that of a metallic lead (Pb) barrier layer of a cable (e.g., a comparable cable).

As such sheath might be greater than approximately ninety % lead (Pb) by weight, it can be known as a metallic lead (Pb) sheath, a lead (Pb) sheath, a metallic lead (Pb) barrier layer, lead (Pb) barrier layer, metallic lead (Pb) layer or lead (Pb) layer. As one instance, the cushion layer 760 could be formed of a cloth with a form and dimension that helps to take care of the shape and measurement of the metallic shield 750. In such an example, the shapes could also be considerably circular. The third materials 2416 can form a cushion layer about the second materials 2414. The third material 2416 can have a hoop stress such that it helps to retain shape, which may, in flip, help to retain shape of the second material 2414. The third material 2416 might be formulated for not less than some amount of crosslinking after extrusion by the extruder 2417. For instance, crosslinking can happen a minimum of in part in situ while the meeting formed through the extruder 2417 is ready to be armored and/or in any other case processed.

For instance, for the cable seven-hundred of FIG. 12, the cushion layer 760 may be extruded at an extrusion velocity that's in a variety from approximately 200 to roughly 800 ft per minute (e.g., approximately 61 to approximately 244 meters per minute). Such a barrier layer may be referred to as a fuel barrier layer, as it is intended to be relatively impermeable to gasoline. As an example, a pump system can embody a pump; a submersible electric motor operatively coupled to the pump; and a power cable for supply of electrical power to the submersible electric motor, the place the facility cable features a conductor, a lead (Pb) barrier layer disposed about the conductor, a cushion layer disposed about the lead (Pb) barrier layer the place the cushion layer consists of crosslinked polyethylene (XLPE), and metallic armor wrapped concerning the cushion layer. For instance, a lead (Pb) based barrier layer (e.g., extruded lead, alloy tape, and so forth.) might rupture the place a peroxide or peroxide related to radical polymerization generates decomposition merchandise that stay inside an insulation layer at the time the lead (Pb) primarily based barrier layer is utilized concerning the insulation layer (e.g., directly or indirectly).