SMALL PROFILE PRESSURE AND TEMPERATURE GAUGES

摘要

Small profile apparatus for pressure and/or temperature sensing within a wellbore are provided. The apparatus may include optical sensing assemblies designed for inclusion in traditional or coiled production tubing deployments and suitable for use in high pressure, high temperature environments. One example assembly generally includes a housing having a divider for separating a first volume from a second volume inside the housing, a compressible element disposed in the first volume, wherein a first end of the compressible element is coupled to the divider and a second of the compressible element is sealed, and a large diameter optical waveguide disposed in an internal volume of the compressible element. The waveguide typically includes a first portion with a first grating and a second portion with a second grating, wherein the first portion has a greater outer diameter than the second portion.

主权项

1. The optical sensing assembly of claim 85, volume, wherein the first end of the compressible element is coupled to the divider, wherein the large diameter optical waveguide is disposed in an internal volume of the compressible element,
wherein the first portion has a greater outer diameter than the second portion, and wherein the outer diameter of the second portion is at least 300 μm.