Abstract: The gas flow meter needs to be tested once every six months. However, the currently installed ABG type gas flow meter and the GIZ high-pressure flow automatic control instrument are difficult to disassemble on the spot and cannot be submitted for periodic inspection, which affects the normal water injection of oil fields. The developed gas flowmeter retractor and associated tools can adjust the length of the pipeline to facilitate the disassembly of the gas flowmeter. Indoor tests and field applications have worked well.
Water injection is a very critical part of oilfield production, and accurate measurement is the most important thing. In order to improve the accuracy of water injection metering and meet the requirements of fine management, a number of advanced automatic gas flow meters have been promoted in parts of the oil field. Among them, the precession vortex flowmeter is more, it is easy to operate, and can automatically adjust the amount of water injection, laying a solid foundation for improving the pass rate of the section and stable production of the oil field. However, due to instrument selection, system process design and understanding of the characteristics of the media, piping, installation, on-site commissioning, matching instrument selection and other aspects are not properly handled, resulting in difficult gas flow meter disassembly, affecting the flow meter verification, Maintenance and replacement, the flow meter cycle calibration rate can only reach 70, and the accuracy of measurement can not be guaranteed, seriously affecting the oil field's fine water injection, long-term goal of stable production. Therefore, it is imperative to develop an easily disassembled device.
1 gas flow meter usage
1.1 On-Site Situation Shengli Oilfield Binnan Oil Production Plant The first oil production mine (hereinafter referred to as the Binnan No. 1 Mine) has a total of 73 water distribution rooms, 260 wells for water injection wells, and 230 wells. The current daily water injection volume reaches 13,200 m. , 238 sets of single-well gas flowmeters were installed, and the whole mine injection wells basically achieved single-well metering. Among them, nearly 2 years due to corrosion, aging and other reasons, have installed 134 flowmeters in 23 distributions, as shown in Table 1, accounting for 40 of the total number of mine flow meters. The main installation is the ABG type gas flow meter and the GIZ type high-pressure flow automatic control instrument. The current situation of use is good, but there is a problem that the disassembly and installation are difficult, and the verification and maintenance are inconvenient.
1.2 The reason why the gas flow meter is difficult to remove
1) The injection wells are connected to the special well-washing pipelines. The pipelines between the water distribution lines are fixed at both ends and there are no elastic activity gaps.
2) The two ends of the flowmeter are connected by a screw thread, there is a concave and convex groove, and the middle seal gasket is added. After the two ends of the flowmeter are unloaded, the concave and convex grooves are engaged and the flowmeter is difficult to remove.
3) The flowmeter is directly connected with the solenoid valve. The whole volume is large, the bottom is suspended, and the disassembly is difficult.
4) The flowmeter has a high degree of precision (accuracy level 1). The use of knock and hammer will seriously affect the measurement accuracy of the flowmeter.
2 Development of Gas Flowmeters
2.1
Structure and Principle The structure of the retractor is shown in Fig. 1. It consists of six parts: telescopic head, back cap, O-shaped sealing ring, gasket, outer sleeve and lower joint. The rear part is a sealed chamber. The front end of the front part can be moved back and forth in the sealed chamber. There is a seal between the rear end and the sealed chamber. When the back cap of the front part is fastened, the rear end presses the seal gasket tightly with the seal chamber, and one stretch can be simply completed. When disassembling the gas flow meter, loosen the back cap to move the front part back, the pipeline is shortened, and the gas flow meter can be easily removed. The opposite is true when installing the flowmeter.
Working principle: Adding a telescopic regulator on the pipeline behind the gas flowmeter can manually adjust the length of the telescopic pipeline. When the gas flowmeter is disassembled, the regulator is contracted. The pipeline behind the flowmeter is relatively shortened, leaving room for activity. Easily remove the flow meter and restore it in place after installation.
2.2 Indoor test gas flowmeters are high-pressure metering devices that are tested at the oil production plant for pressure tests. With the step-by-step pressurization method, the pressure is held for several minutes under the pressure of 1 to 30 MPa, and there is no leakage phenomenon, and the disassembly is convenient and the design requirements are achieved. Specific test data is shown in Table 2.
2.3 Field Application
2Ol0 to O219 were reconstructed at the 8th station of Binnan No.1 Oil Production Recovery Well and 9th station at PF4—5—9l well. The installation adopted the paint electrode welding, which has high flexibility and adaptability, and the equipment is relatively simple. . At the same time, both sides of the flowmeter retractor are welded with double V-shaped bevels in order to withstand the high pressure, as shown in Figure 2. Among them, the pump pressure of PF 4-5 wells is 13.2MPa, the hydraulic pressure is 12.4MPa, and the daily injection is 50rfi. , Note 47rfl. PF4—5—91 well pump pressure is 13.2MPa, oil pressure is 11.9MPa, and daily injection is 40m. , Note 34m. . Satisfy the design requirements, the current situation is good.
After the retractor was put into use for 47 days, the assembly and disassembly test was carried out. It was convenient, quick, and labor-saving. The flow of the gas flow meter was particularly deformed, and the flowmeter retractor did not leak water. After the use effect was verified, the Binnan No. 1 Mine installed the device in 130 wells in a timely manner, and timely monitored other installed flowmeter retractors, found problems in the application process, and responded promptly. For example, for the case where the front part is moving at a slow speed, a matching tool for the device is designed (as shown in FIG. 3), and the process is continuously perfected to ensure the performance and effect of the device's on-site use.
4 Benefit Evaluation
1) Social benefits Solve the problem of gas flow meter disassembly inspection, change the status of previous electric welding dismantling and installation of flow meter, reduce the damage and maintenance of the flow meter; reduce the labor intensity of the staff; achieve the accuracy of the injection wells Measurements ensure the stable production and increase of production of oil wells.
2) Economic Benefits Before the device was used, it was estimated that the demolition and installation of a flowmeter would require labor costs, vehicle fees, and material fees totaling ¥1200. Affect the average amount of water injection 10m. / Times, equivalent to crude oil 2t about ¥ 6000 yuan. After the use of these problems are solved, one person can operate, if calculated according to the scene using 41 injection wells, the direct economic benefits of a (1200 + 6000) × 41 × 2 (times / a) a 900 (single cost price) × 41-55.35 (million).
5 Conclusion
1) The developed gas flow meter expander and its associated tools have made up for the lack of adjustment distance between the original water distribution process in the horizontal and vertical directions.
2) It has the characteristics of simple structure, convenient assembly and stable and reliable work.
3) It is convenient to repair and inspect the flowmeter, so that the flow meter cycle verification rate can reach 99%.
4) It is of great significance to improve the pass rate of the section, fine water injection and stable production of the oil field.
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