U-shaped fiber optical cable assembly for use in a heated well and methods for installing and using the assembly
A technology of optical fiber cable and optical fiber assembly, applied in the field of U-shaped optical fiber cable assembly
Inactive Publication Date: 2008-04-23
SHELL INT RES MAATSCHAPPIJ BV
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Problems solved by technology
[0009] A problem with known U-shaped fiber optic cable assemblies is that when the assembly is deployed in a heated well, especially when the well is heated to temperatures above 200 or 300 degrees Celsius, especially the portion of the fiber optic cable that bends into a U shape, Fiber core and / or surrounding front end sections are susceptible to darkening, especially hydrogen darkening
Method used
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[0023] Figure 1 depicts a heater well 1 traversing a subterranean hydrocarbon-bearing formation 2, into which formation steam is injected through perforations 3 in the casing 4 of the middle section 1B of the well 1 . Denoted as H in Figure 1 2 The steam of O has a temperature above 200 degrees Celsius and is injected through the steam injection port 5 at the wellhead 1C so that the steam flows from the wellhead 1C and the perforations 3 into the formation 2 . Optionally, electric heating cables 6 are suspended in the well 1 to maintain the steam and / or surrounding formation 2 at the desired temperature above 200 degrees Celsius.
[0024] A U-shaped fiber optic cable assembly 10 is suspended within the well 1 in order to monitor temperature, pressure and / or other physical properties inside the heater well 1 . This assembly comprises a U-shaped fiber optic cable 11 with first and second upper ends 11A and 11B through which light pulses are alternately emitted into the cable 11...
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A U-shaped fiber optical cable assembly (11, 21) is arranged in a heated well (1) such that a nose section (13, 23) comprising the bent U-shaped cable section (11C, 21C) is located near the toe (1 A) of the well where the ambient well temperature is lower than the temperature of an intermediate section of the well which is heated by steam injection, electrical heating and / or influx of heated hydrocarbon fluids from a heated section of the surrounding formation to a temperature above 200 degrees Celsius, thereby inhibiting the risk of hydrogen darkening of the bent U-shaped cable section. It is preferred to make the nose section of a glass solder, to arrange the U-shaped fiber optical cable assembly in an aluminium guide tube (22) sealed at its lower end with end cap (31), and to use a heat resistant fiber optical cable to further inhibit the risk of hydrogen darkening of the assembly.
Description
technical field [0001] The present invention relates to a U-shaped fiber optic cable assembly for use in a heater well, a method for installing the U-shaped fiber optic assembly in a well, and a method of using the assembly in a heater well. Background technique [0002] In the oil and gas industry, subterranean hydrocarbon-bearing formations are often heated by steam injection and / or electrical heating in order to reduce the viscosity of hydrocarbons, vaporize, crack and / or pyrolyze hydrocarbons so that low-viscosity, cracked, vaporized and / or pyrolyzed hydrocarbons that readily flow through the heated portion of the formation to one or more hydrocarbon fluid producing wells. [0003] In such cases, heat may be injected through one or more dedicated heater wells through which steam is injected into the formation and / or electric or other heaters are placed in said heater wells and hydrocarbons may be injected through one or more production from a dedicated production well. ...
Claims
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IPC IPC(8): E21B43/24E21B47/06E21B47/12
CPCE21B43/24E21B47/123E21B47/06E21B47/135E21B47/12
Inventor A·弗兰岑K-M·耶斯凯莱伊宁
Owner SHELL INT RES MAATSCHAPPIJ BV