Robert L. Trosper GPM Gas Company Bartlesville, Okla
Robert G. Stubbs GPM Gas Corporation Odessa, Tex.
Darrell Carver GPM Gas Corporation Houston
Houston GPM Gas Corporation is a subsidiary of Phillips Petroleum, the company has achieved on-site automation control system (FACS), enabling the company to remotely monitor areas in New Mexico's natural gas production run.
The system helps improve efficiency and reduce the number of employees.
Now the operator can accurately monitor and control the natural gas gathering, turbocharger, and plant operations. The system enables remote monitoring and measurement of the gas source in the process gas flow rate, temperature and pressure.
Now, the GPM system for natural gas exploitation can access by telephone or fax connected to each of their well field meter real-time production information.
Three components
GPM in the New Mexico area acquisition and processing of natural gas per day is about 260MMcfd. Area of 10,000 square miles area, including four natural gas plants and 25 gas booster station (Figure 1).
Natural gas from 1800 m along the approximately 300 miners that purchase.
In the past, every seven days traffic information is collected through a manual. Staff daily check of each booster, natural gas processing plant is on duty 24 hours a day.
In 1991, GPM found through the latest communication and control technology can achieve a more effective and more responsive operation mode.
FACS consists of three functional components: use of remote sensing technology, electronic flow measurement devices (EFM), turbocharger supervisory control and data acquisition system (SCADA), and plant control and optimization.
Each system component is managed by the control computer, but they are able to use Novell software through WAN to share data and information.
Current FACS system through headquarters in GPM Hobbs, Eunice plant, Zia factories, and Lee plant (all in the Lea NM region) 10 computers to operate and control. In addition, through the company's wide-area communications network, GPM of Odessa, Tex and the Houston office to the FACS system can also access the information.
EFM using telemetry
GPM Bartlesville Oklahoma area using AAI's Total Flow products as its primary electronic flow meter.
This is a microprocessor-based computers, mainly for gas flow measurement and design. Circuit compressed into a large single plate, and installed in the casting of aluminum. Because the shell on the NEMA-4X Class 1Division 2/ABCD performance, equipment installation does not require additional protection to the components. (2)
EFM equipment with a 100-in differential sensors, static sensors range from 100 to 1,500 psia, the flow of the main components for the measurement. As larger changes in atmospheric temperature, to improve the measurement accuracy, the use of a temperature compensated pressure sensor.
Work area in the system, the temperature from 0 ° F ℉ winter low temperature to 100 °F ℉ summer seasonal changes of temperature are common. Temperature compensation sensor reduces the gas due to temperature changes caused by measurement error.
In addition, the installation of a remote temperature device (RTD) probe to adjust the gas flow caused by temperature changes.
Calibration technician GPM GPM Gas used in the
Recently installed automation systems in New Mexico on the electronic flow measurement (EFM) equipment (Figure 2).
This flow computer measurement of a second pore flow state, and continue to accumulate information in order to calculate a volume flow per hour.
Calculate the flow per hour and an hour later with the flow of data stored in EFM's memory, the accumulation of 35 days for the information.
EFM memory retention in 35 days as the daily flow of information only to the central computer via radio telemetry to send data traffic to the backup.
In addition to the rear of the terminal box to expand to accommodate the microwave radio transceiver, the purchase of electronic flow recorder does not require the production of additional requirements for wireless telemetry.
When the need for wireless telemetry, then install the built-in communication card for connection of fixed radio equipment hinge plate, the wireless transceiver, wiring harness, and an attached 8-Amp / hour battery.
Equipment installed in power by the EFM device above 12V, 10W solar battery cell. Solar panels provide power to the EFM, if the hair installed wireless telemetry equipment, solar panels also provide power to the wireless telemetry device.
In wireless systems design, data rate is one of the most important factor to consider. Since many systems are due to launch gas flow rate of information transfer in the air time is limited, GPM that the use of high data rate transmission is necessary. Maximum capacity for the system to get the best price, the wireless communications system equipment to work the speed is set to 4800 baud.
Meanwhile, in order to minimize interference, the wireless system uses 950Mhz frequency of multiple address frequencies. By allowing the establishment of three high-altitude relay tower to cover the entire work area.
Assumed to receive a minimum of -110 dbm signal strength, each relay tower coverage up to 7,500 square miles. Through the three relay tower reasonable position to enable them to continuously cover the work area.
MDS can be used as full-duplex digital radio relay station, also used as the main polling station in Hobbs.
Each wireless device comes with the time of purchase, "boot" backup device and battery backup, so the primary link to ensure that disruption to a minimum.
EFM in each is of a digital radio modem and transceiver-way wireless devices. Frequency synthesizer designed to separate the use of radio equipment to relay to the specified site programming. Remote stations using high-gain dipole antenna of seven to ensure good signal quality, noise is minimized.
The project required high-quality foam insulation feeder is RG-8 cable. Than the original transmission cable considering the performance is slightly lower, but chose it because of concerns about the field operation encountered the harsh working environment.
EFM measurement system from the gas collection system in the 1,500 polling data acquisition and computer traffic. System features include real-time redeployment / transfer of alarm capability, the host to transmit traffic for billing data, and daily reports (ie, gas balance, loss of data, and report data changes).
Computer Support
Computer support system includes five applications to run automation software, Novell software, and custom computer software GPM.
IBM 80-based file server is running on 25Mhz, with 320 mb of internal SCSI hard drive (for system files and software from the manufacturer), two external 600 mb hard drive for user files).
In addition to gas measurement file server other than the staff can use its normal business functions, such as word processing, spreadsheet analysis, and graphics files.
Communications Server for LAN workstations to poll a remote microwave radio data system provides the interface. This communication is a 20Mhz of IBM 70 computer-based computer.
The machine includes a Digicom PS / 8 interface cards, up through the RS-232 cable to connect five master stations. It is saved on the server to access files in a directory, to collect and through the "mailbox" approach to respond to communication requests.
In southwest New Mexico's natural gas company's Sand Dunes GPM booster stations and 24 other booster stations by the GPM of the new automation system remote monitoring. Box and antenna (foreground) is to monitor gas flow and sends the data recorded as part of electronic flow measurement system (Figure 3).
The two machines used for automated workstations can achieve more advanced features. The first machine is to run the application automation software company's central data acquisition unit collecting machine.
The machine is responsible for all of the telemetry from the daily EFM data collection, update the central file server on a single measurement file, resulting in lost data and daily balance reports, and to generate a fax report to the exploitation of people and GPM staff, while the data sent to Phillips Petroleum's IBM mainframe. Data transfer is to achieve wide area network access every night.
The second machine is a voice information system, 486-DX2 computer as a dedicated gateway, runs on 66Mhz, built a Dialogic (dialogue) D41 / d voice card. This can put additional cards for digital audio playback.
VIS computer polls every 30 minutes EFM, GPM and exploitation to provide two sets of basic data; has the correct security code, the user can call the system, and to receive from each individual EFM real-time data, including the current flow state and the total volume of the previous day.
In addition, when the VIS determine flow computer error occurred when scheduled, it is designated to be responsible for traffic control that sets the department to call the police.
This feature allows enough of the special event notification to occur to the GPM or miners. As well stop the flow, compressor stop, reaching the limit of work, or to any monitoring of any alarm conditions.
Installed in the company's LAN fax server supports fax. Need a server to work with an RJ11 telephone line interface.
Through the LAN using Novell Netware, GPM has been able through its token network "backbone" of the network connected to the WAN. This can be achieved with the five states in the 72 file servers connected to any one or GPM Phillips Petroleum Company access to the computer.
Any remote user can execute this way data collection without polling or communication via modem. Hobbs trunk to support the minimum bandwidth is 384Kbaud, is Phillisp company 1.56M baud T-1 bandwidth circuit part. You can also access through the LAN calculate the volume of the host.
Scada system booster
Scada system by polling the Siemens S5-300U programmable controller (PLC) to monitor 11 booster stations and 609 data points.
Through a combination of Modbus EFM telemetry systems and telemetry systems to collect engine data entry, the suction side and discharge side and the speaker opening pressure and volume values. Subsequent data into Iconics's Gensis scada system package.
Scada system includes two computers.
The first is the Gateway 486-DX2-66 (run mode), the Hobbs Division in GPM, it is physically connected to the Modus master radio and Novell networks.
Every 30 seconds to complete a poll of all Siemens PLC's Genesi and data to the database.
33Mhz master is a gateway 486-DX, the factory is located in Eunice, about 20 miles away from Hobbs. Data transmitted through the network and displayed 24 hours a day on duty in the plant control room (Figure 3).
Once the occurrence of any one booster station pre-set conditions, they sound the alarm by the operator to confirm.
Previously, the need for an on-site inspectors checked daily on-site control panel, to ensure that the engine functions properly.
Now, scada system can continuously monitor the booster station, no longer need to check the site every day (Figure 4).
Work on the engine and compressor continuous monitoring allows the operator to quickly diagnose their failures, and send the appropriate site personnel: mechanical or instrument specialist or expert site operator to carry out repairs. This reduces staff requirements and compressor downtime.
Plant control system
GPM New Mexico area for all plant control systems FACS facility in the works. However, in GPM's Zia factory in September 1993 this system had been successfully achieved.
The system enables plants Zia by Genesis scada data packets to achieve unattended operation.
Management control system running on four 33Mhz, 486 on the Genesis of the Texas computer control software, to achieve the operational control of the process.
A computer as a "dumb terminal", through "Tiway card" and Siemens TI 545 PLC through the serial port communication with the Moore loop controller, ABB / Taylor Kent cycle controller, and motor control center building in Multlin power monitoring device to communicate.
Factory electronics and process control functions are done by the PLC and the local controller. Computer monitoring system damage will not interrupt the operation of the plant, because all security and emergency systems are independent.
Siemens TI 545 controller allows the process input and output signal is sent to the factory processing area of the six distribution board, and then through a pair of communications lines to digitally back to the central processing unit.
"Dumb terminals" connected to the IBM Token Ring WAN.
Three workstations connected to the token ring (Token Ring). Zia is located in a factory, the other two plants located in Lee, about 30 miles apart.
Each workstation includes a touch screen or mouse interface for the operator to select.
Zia token Netcom microwave and T1 lines to connect to the Hobbs Token Ring. Through a dedicated line to connect to the Lee plant.
All computer systems to communicate through the network token, it makes GPM workstation can connect to the WAN on the company anywhere.
This allows engineers and operations management as in the control center, like "login" to the Zia control system, and view the processing screen.
Advantage
FACS system to achieve greatly improved the efficiency of GPM New Mexico area. Before the realization of the EFM data telemetry, 40% of the country charts collected by the surveyors to do. The realization of the measurement system reduced staff while improving data accuracy and timeliness of measurement.
Scada system booster to achieve the GPM to "independently" and without on-site inspection. This reduces non-productive time and from the booster station. Implementation of the system, greatly reducing overtime.
GPM Gas Corporation Eunice, NM gas processing plant personnel to monitor and measure the processing of gas from Tseng Tau flow, temperature and pressure. (Figure 4).
The system's biggest advantage is to improve the operational failure or district staff on the ability to respond to market changes. In the FACS to achieve before, often to the booster station to determine the two travel time and repair faults. After achieving a scada system, the maintenance personnel to the scene before the problem is identified out.
GPM's FACS system, another advantage is it to provide timely and reliable exploitation of the source of information.
GPM can be faxed to the gas extraction wells in the last 24 hours by gas flow in detail. Mined by miners who also unique, safe and confidential telephone system has been updated by the minute gas flow and alarm information.
In addition, the use of this measurement system can be more efficient exploitation of those who pay the cost of the product. Alarm System Monitor can automatically warn miners of their gas potential problems
