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SUPERSEAL

Camesa introduced the concept of SUPERSEAL about four years ago for use in monoconductor cables which are used in pressure control systems.

In the past there has often been a problem in using a brand new cable in a producing well, as it has been almost impossible to produce an efficient seal with the grease injection system, due mainly to the fact that fluids and gas migrate up the cable itself in the void spaces between the armour layers. In a well-worn cable, the inter-armour void space is normally filled with rust, corrision, mud, sand and other solid matter which finds its way into the cable during the course of its life. This solid matter helps to form the cable into a fairly reasonable seal when it is run in a pressure control head.

However, when a cable is brand new, the inter-armour voids are clear for the passage of fluids (especially gas) which can pass up the inside of the cable, regardless of the quality of the grease seal on the exterior surface of the cable. In order to overcome this problem, Camesa developed SUPERSEAL which forms an effective seal inside a new cable.

SUPERSEAL is a compound which is applied during manufacture to the inner armour of the cable, just before the outer armour is wound onto the cable, and the constituents of SUPERSEAL are such that it contains solid particles in a high viscosity paste to prevent it being forced out of the cable by wellhead pressures.

SUPERSEAL was on field-test jn numerous gas wells for a period of over two years with exceptionally good results, and is now incorporated, as standard, on our full range of monoconductor cables. Laboratory tests on production cables have shown drastic reductions in the amount of fluid leakage past a pack off, and measurements on cables built with SUPERSEAL indicate a fluid leakage of only two to three percent of a cable without SUPERSEAL.

One additional feature of cables with SUPERSEAL is the fact that the solid matter between the armour layers increases inter-armour fricion, which resists torsional movement of the armour layers relative to one another. Reduced twist in the cable is the nelt result and will mean increased service life, less armour milking (and consequent birdcaging) and reduced need for cable repair involving retwisting of loose armour.

All Camesa monoconductor cables are now built with SUPERSEAL in the armour and this major contribution to effective pressure control is offered at no increase over our previously untreated cables.

April '92

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