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Replaceable Protector for Critical Pressure Equipment

IP.com Disclosure Number: IPCOM000234998D
Publication Date: 2014-Feb-21
Document File: 4 page(s) / 225K

Publishing Venue

The IP.com Prior Art Database

Abstract

Proposed Replaceable protector for critical pressure equipment (or Replaceable Protector) can be used in Coiled Tubing Service, Well Testing Service, Drilling Services, Workover Service, Well Production Service, and similar services where erosion, abrasion, or combination of both may be seen on some parts of critical pressure equipment during work, such as: flow tees, flow crosses, wellhead spools, flange unions and similar pressure equipment

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Replaceable Protector for Critical Pressure Equipment

Introduction

During bottom up wellbore circulation with any concentration of solids abrasion damage on pressure equipment always occurs. Most damaged with abrasion equipment can be found at surface due to accelerated fluid velocities, especially if it's driven by free gas. In some cases erosion also may occur in addition if velocity will exceed critical number. Both abrasion and erosion will lead to metal loss and to reduction of pressure equipments' bearing capacity. Replacement of expensive pressure control units then becomes unavoidable. It always leads to substantial financial and productive time losses.

Proposed Replaceable protector for critical pressure equipment (or Replaceable Protector) can be used in Coiled Tubing Service, Well Testing Service, Drilling Services, Workover Service, Well Production Service, and similar services where erosion, abrasion, or combination of both may be seen on some parts of critical pressure equipment during work, such as: flow tees, flow crosses, wellhead spools, flange unions and similar pressure equipment where API 6B flange unions, or API 6BX flange unions with sufficient bevels on both flanges (as per API SPEC 6A). In addition, Replaceable Protector can be used in listed above and other offset flange unions (open face flange unions) to reduce substantionally turbulence in step-changing flanged piping profiles.

Prior Art

Most related patents are listed below:

US Pat. 4023814 - Filed Jul 16, 1975 - Issued May 17, 1977 US Pat. 4632183 - Filed Dec 5, 1984 - Issued Dec 30, 1986

US Pat. 4241786 - Filed May 2, 1979 - Issued Dec 30, 1980 US Pat. 5396956 - Filed Dec 13, 1993 - Issued Mar 14, 1995

Summary

Wellhead and other surface pressure equipment are subject to metal loss during wellbore bottom up circulation where any concentration of solids can be found. In some cases with high fluid velocity, erosion mechanism accelerates metal loss. The most of metal losses occur on the bottom sections (red line on Fig.1) of pressure equipment due to gravity acting on flowing solids in flow crosses, flow tees, wellhead spools, choke manifolds, and similar pressure devices. Higher velocity of wellbore fluid accelerates damage. Use of nitrified fluids without adequate control in some cases may destroy surface pressure equipment in few hours.

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Fig.1 Exposure of Flow Tee with Solids Fig.2 Damaged Flow Tee Flange

When damage is noted and inspections is not successful, then replacement of pressure control equipment required. Proposed Replaceable protector for critical pressure equipment was invented to sacrifice in pressure equipment against abrasion and erosion preventing damage of main pressure components. Replaceable Protector can be made of inexpensive materials. Flange unions as per API Spec 6A can facilitate lug of Replaceable Protector with soft retainer to keep Protector in place. At same time Replaceable Protector is not a pressure sea...