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Offshore gas temperaturepressure dynamic monitoring

Project backgroundProject requirementsSolutionResultHighlightsproblems

The target project gas field is located in a self-block offshore platforms in the South China Sea. There are currently nine wells on the platform fully operational. In the early stage, monitoring underground gas reservoirs uses conventional electron temperature gauge. Seven has been installed, but failures appeared after a period (up to 1 year and a half) of working.

Meanwhile, the "monitoring and analysis technology with high water - reservoirs" special research project based on the "Twelve Five" sub-topic relates to the production of research studies sectional research and testing technology. It provide a breakthrough for invention / discovery more efficient development of deep, high-pressure, high-temperature reservoirs new technologies, and new processes.


The project selected permanent downhole fiber optic temperature and pressure monitoring system. Project requires the installation of a fiber optic temperature permanent pressure monitoring system, real-time monitoring of downhole pressure and temperature data (flow pressure / static pressure).

Well objective body structure diagram shown as below:




Project requires the installation of a permanent system of fiber-optic temperature and pressure sensors. Temperature permanent timely monitors wells within the wellbore during production, gas pressure parameter data and with the measured parameter data real-time transmission to the ground for display and storage.


No.

Technical Parameters

Technical parameters requirements

Technical parameters Response

1

Monitoring point (temperature - pressure)

1个

1个

2

Sampling frequency

≥5 sec. 1 point

Pressure recovery:≥4 sec. 1 point

Normal work: Adjustable Frequency

3

Working pressure

≥50MPa

10000PSI

4

Working temperature

≥150℃

200℃

5

Manometer Range

4500-5000PSI

0~5000PSI

6

Pressure Accuracy

0.02%FS

0.02%FS

7

Pressure Resolution

0.1psi

0.1psi

8

data transmission

Real time

Real time

9

System life

≥5year

5~10 year



①String structure

Well string target structure shown as below:



②Introduction of system

The basic composition of the fiber permanent downhole pressure and temperature monitoring system as shown below. It can be divided into the underground part and the ground segment. Underground part mainly includes downhole temperature and pressure sensors, sensor holder tube, underground armored cable, cable protection; ground segment includes cable and terrestrial signal demodulator section.



Temperature and pressure sensor monitors the pressure in the tubing can be monitored when open wells flowing pressure, static pressure can be monitored shut.



①Project implementation

The project was finished the underwell part by Sep. 2015. Project period is from Sep. 11, 2015 to Sep. 14, 2015


      



②Pictures of sites

Date & Time                          Temperature(°C)                    Pressure(Mpa)

2015-9-20 10:10:42               124.466556621448               27.1722753427491

2015-9-20 10:12:06               124.565240963854               27.1816863272276

2015-9-20 10:13:30               124.549052049044               27.1808111334052

2015-9-20 10:14:55               124.520704922409               27.1690734113194

2015-9-20 10:16:19               124.542984354256               27.1681846460941

2015-9-20 10:17:44               124.502479926057                27.1661434986337

2015-9-20 10:19:08               124.578049024851                27.15092922566

2015-9-20 10:20:32               124.487895501066                27.1376354809977

2015-9-20 10:21:55               124.497804053916                27.1330914706179

2015-9-20 10:23:19               124.470506253313                27.1452919631337

2015-9-20 10:24:43               124.545601082677                27.1694266835386

2015-9-20 10:26:08               124.460146218218                27.239049707156

2015-9-20 10:27:32               124.498570897468                27.2384125111733

2015-9-20 10:28:56               124.481971028241                27.2366385867947

2015-9-20 10:30:20               124.539460027077                27.2429867966579


①First use of Sapphire temperature and pressure sensor

The project is based on the world's first sapphire optical fiber temperature pressure sensor for the first time apply advanced offshore wells. The successful implementation of the project, marking the substantive breakthroughs in development and application of high temperature, high pressure fiber-permanent temperature and pressure sensing system. Fundamentally solved the problems of the world's ultra-high temperature, high pressure gas well downhole temperature and pressure dynamic monitoring.

②First use of gas wells

One well is implemented for the objectives well of the project. The successful implementation of the well, marking the successful application of sapphire-based fiber optic temperature and pressure sensors in the offshore platforms for oil and gas wells. It not only played an exemplary role in offshore platform dynamic monitoring, but also for land dynamic monitoring wells application.

③Deep high dynamic monitoring applications

The objective project well measured depth is 4051 meters, it is a high deep one. For these wells, there has been a difficulty to monitor the long-term dynamic monitoring. The successful implementation of the well for dynamic monitoring of land application of high or deep offshore platforms constitute iconic role model.

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