Heavy oil thermal recovery steam injection process on the basic requirements of the control valve should be able to have a larger flow in the small flow-pressure function, and large flow can get a small pressure drop. Existing steam flow control valves are difficult to effectively regulate the steam flow in the entire range of travel, and there are vibration and erosion issues. Based on the analysis of the structure, working principle and existing problems of high pressure differential flow control valve at home and abroad, a new type of high pressure differential labyrinth steam flow control valve was developed. When the valve opening percentage from 0% to 100% (stroke change), the percentage flow from 0% to 100%; the other hand, down, the entire trip nearly 100mm can be easily adjusted, and achieved high pressure drop low Flow rate. In the valve inlet p into = 9.4MPa, outlet p out = 3.2MPa, the measured valve noise 70dB (ordinary control valve noise to 84dB above), radically reduce the erosion and noise. Keywords: steam injection flow control valve high pressure differential 1, the heavy oil heat recovery injection steam flow control valve on the basic requirements of heavy oil thermal recovery into steam drive after the formation of a relatively fixed injection pipe network, steam distribution and metering Typical process. Three issues of crucial importance in the development of steam injection steam are the distribution, metering and regulation of steam. Reasonable steam regulation can realize scientific steam injection, raise the steam-oil ratio of thermal recovery and the recovery rate of crude oil, so as to obtain satisfactory economic benefits. Heavy oil thermal recovery has single-well throughput and steam flooding two stages. In the whole block thermal recovery process, in addition to the initial single-well throughput, the general single-well throughput and steam flooding at the same time. Therefore, with the gas station to the throughput wells and steam flooding well note. In the thermal recovery site of Karamay Oilfield in Xinjiang, the pressure of the throughput wells is high (5 ~ 10MPa) and the steam injection volume is large (6 ~ 10t / h) 1.5 ~ 5t / h). This means that the pressure differentials between the distributors and the steam injection wells vary by 3 MPa or more and a flow resistance must be added between the distributor and the steam injection well to absorb the remaining pressure. Obviously, the flow control valve used here should have a large depressurization function at low flow rates and a small pressure drop at high flow rates. This is the heavy oil thermal recovery injection steam process valve on the special requirements. 2, the existing steam flow control valve and high pressure differential flow control valve problems At present thermal recovery process, in order to step-down, the use of the control valve to a very small opening, the valve steam flow rate is high, poor adjustability , It is difficult to reach the predetermined flow value. In addition, a distributor corresponds to a multi-port steam injection well. Adjusting the flow of one well will affect the flow of the other wells, which in turn increases the difficulty of flow regulation. Shengli Oilfield and Xi'an High Pressure Valve Factory JT65y250V high-pressure steam valve to develop the resistance of the piston through-hole adjustment structure. According to the field thermal test data plotted the percentage of flow and opening percentage curve shown in Figure 1. Seen from the curve, the opening from 0% to 10%, the flow rate of more than 60%, adjust the sensitivity is too large, the valve hand a move, or the steam flow is too large, or too small. In 10% of the opening above the sensitivity and adjust too low, in the 40% to 100% open range without regulation. It is therefore difficult to regulate the steam flow efficiently over the full travel range. At the same time, when the valve opening is small, the fluid in the valve reaches the critical flow rate, causing serious problems such as vibration and erosion. Figure 1 JT65y250V-type high-pressure steam valve closing the percentage of flow rate and opening percentage curve Xi'an Jiaotong University researchers designed GYY high differential pressure regulating valve (Figure 2) to achieve a high pressure drop and flow control to improve the characteristics, However, the critical flow rate is too high to erosion, vibration, noise and other issues more serious, had to use high-strength, wear-resistant materials. In this way, the valve cost is not only increased, but the rate of change of the flow rate with the stroke is still large, and the adjustment characteristics have not been significantly improved. In addition, the critical flow generally requires a ratio of inlet pressure to backpressure greater than 2, which limits its range of application. For example, some thermal recovery steam injection wells require pressure 8 ~ 12MPa or higher, and the maximum pressure of the boiler outlet 18MPa, it is impossible to form a critical flow. In field applications, this control valve can not effectively achieve a wide range of high temperature and pressure flow control and pressure drop adjustment, the flow rate adjustment depends mainly on the last level of the channel area. This adjustment method is not the fundamental difference between ordinary valves, it is still difficult to regulate the valve opening to ensure the expected flow. A common feature of the existing high differential pressure flow control valves is that high pressure differential inevitably leads to high flow velocity, which brings about serious problems of vibration, erosion and noise. How to solve these problems is an important research topic placed before science and technology personnel. Figure 2 GYY high pressure regulator valve 3, the development of a new high-pressure labyrinth steam flow control valve abroad in the research on the control valve put forward some valuable ideas and methods of design. Figure 3 for the United States designed a control valve variable flow valve heart. The difference with the ordinary valve is that the flow area changes with the stroke, and the valve throttling series, the drag coefficient also decreases with the stroke becomes larger, that is, the flow area variable and the drag coefficient is inversely proportional to change. As a result, the valve core can correct the deviation of natural pressure drop in many process control systems to achieve a large pressure drop or a large pressure drop and obtain a wide range of inherent regulation. In addition, the use of multi-stage pressure drop, tortuous flow to reduce the flow rate with low noise characteristics. The actual number of flow through the fluid channel and the valve opening is proportional to the valve stroke that is just the beginning, only one flow channel exposed, and the opening close to 100%, the maximum number of exposed flow channel, the spool in the Figure Location, the black part is the actual flow channel. However, it causes other problems. For example, the throttling member uses the straight and straight connection of the vertical elbow (or inversely and inversely connected, that is, the positive right-angle elbow) to restrict the flow resistance coefficient. The sealing performance is poor and the leakage is serious. Complex, high processing costs, so this valve does not appear in the US domestic market. Figure 3, the United States designed variable flow resistance valve heart In summary, the heavy oil thermal recovery steam injection process requires a high pressure differential valve, in addition to adapt to high temperature and pressure of two-phase flow of soda medium, but also the case To high pressure, wide adjustment range, vibration, erosion and other special problems. To this end, the Xinjiang Petroleum Administration Oil Production Technology Research Institute and Tsinghua University Institute of Nuclear Technology to carry out a joint research, the guiding ideology is to maximize the resistance coefficient of the valve to achieve high pressure drop at low flow rates, radically ease Erosion and noise, get a good regulatory performance and a wide range of inherent flow regulation. The new design of the labyrinth flow control valve (declared a national patent, the valve structure shown in Figure 4) Karamay red light hot oil in the heavy oil field conducted a field test, the results shown in Figure 5. Figure 4 labyrinth flow control valve spool Figure 5 flow percentage and opening percentage curve When the valve opening changes, the flow changes gently and steadily. When the opening percentage is from 0% to 100% (travel is constantly changing), the percentage flow increases from 0% to 100%. On the contrary, the decline, the entire journey of nearly 100mm can be easily adjusted. It can be seen from the curve in Figure 5 that the valve opening percentage is approximately linear with the flow rate, so it is easy to adjust and the valve achieves a low flow rate under high differential pressure. In the valve inlet p = 9.4MPa, outlet p = 3.2MPa, the measured valve (30cm away from the valve) noise 70dB (ordinary control valve noise to 84dB or more), indicating that the labyrinth flow control valve has a good promotion and application prospects And huge economic benefits. Heavy oil thermal recovery steam injection process on the basic requirements of the control valve should be able to have a larger flow in the small flow-pressure function, and large flow can get a small pressure drop. Existing steam flow control valves are difficult to effectively regulate the steam flow in the entire range of travel, and there are vibration and erosion issues. Based on the analysis of the structure, working principle and existing problems of high pressure differential flow control valve at home and abroad, a new type of high pressure differential labyrinth steam flow control valve was developed. When the valve opening percentage from 0% to 100% (stroke change), the percentage flow from 0% to 100%; the other hand, down, the entire trip nearly 100mm can be easily adjusted, and achieved high pressure drop low Flow rate. In the valve inlet p into = 9.4MPa, outlet p out = 3.2MPa, the measured valve noise 70dB (ordinary control valve noise to 84dB above), radically reduce the erosion and noise. Keywords: steam injection flow control valve high pressure differential 1, the heavy oil heat recovery injection steam flow control valve on the basic requirements of heavy oil thermal recovery into steam drive after the formation of a relatively fixed injection pipe network, steam distribution and metering Typical process. Three issues of crucial importance in the development of steam injection steam are the distribution, metering and regulation of steam. Reasonable steam regulation can realize scientific steam injection, raise the steam-oil ratio of thermal recovery and the recovery rate of crude oil, so as to obtain satisfactory economic benefits. Heavy oil thermal recovery has single-well throughput and steam flooding two stages. In the whole block thermal recovery process, in addition to the initial single-well throughput, the general single-well throughput and steam flooding at the same time. Therefore, with the gas station to the throughput wells and steam flooding well note. In the thermal recovery site of Karamay Oilfield in Xinjiang, the pressure of the throughput wells is high (5 ~ 10MPa) and the steam injection volume is large (6 ~ 10t / h) 1.5 ~ 5t / h). This means that the pressure differentials between the distributors and the steam injection wells vary by 3 MPa or more and a flow resistance must be added between the distributor and the steam injection well to absorb the remaining pressure. Obviously, the flow control valve used here should have a large depressurization function at low flow rates and a small pressure drop at high flow rates. This is the heavy oil thermal recovery injection steam process valve on the special requirements. 2, existing steam flow control valve and high pressure differential flow control valve problems At present thermal recovery process, in order to step-down, the use of the control valve to work a very small opening, high valve steam flow rate, poor adjustability , It is difficult to reach the predetermined flow value. In addition, a distributor corresponds to a multi-port steam injection well. Adjusting the flow of one well will affect the flow of the other wells, which in turn increases the difficulty of flow regulation. Shengli Oilfield and Xi'an High Pressure Valve Factory JT65y250V high-pressure steam valve to develop the resistance of the piston through-hole adjustment structure. According to the field thermal test data plotted the percentage of flow and opening percentage curve shown in Figure 1. Seen from the curve, the opening from 0% to 10%, the flow rate of more than 60%, adjust the sensitivity is too large, the valve hand a move, or the steam flow is too large, or too small. In 10% of the opening above the sensitivity and adjust too low, in the 40% to 100% open range without regulation. It is therefore difficult to regulate the steam flow efficiently over the full travel range. At the same time, when the valve opening is small, the fluid in the valve reaches the critical flow rate, causing serious problems such as vibration and erosion. Figure 1 JT65y250V-type high-pressure steam valve closing the percentage of flow rate and opening percentage curve Xi'an Jiaotong University researchers designed GYY high differential pressure regulating valve (Figure 2) to achieve a high pressure drop and flow control to improve the characteristics, However, the critical flow rate is too high to erosion, vibration, noise and other issues more serious, had to use high-strength, wear-resistant materials. In this way, the valve cost is not only increased, but the rate of change of the flow rate with the stroke is still large, and the adjustment characteristics have not been significantly improved. In addition, the critical flow generally requires a ratio of inlet pressure to backpressure greater than 2, which limits its range of application. For example, some thermal recovery steam injection wells require pressure 8 ~ 12MPa or higher, and the maximum pressure of the boiler outlet 18MPa, it is impossible to form a critical flow. In field applications, this control valve can not effectively achieve a wide range of high temperature and pressure flow control and pressure drop adjustment, the flow rate adjustment depends mainly on the last level of the channel area. This adjustment method is not the fundamental difference between ordinary valves, it is still difficult to regulate the valve opening to ensure the expected flow. A common feature of the existing high differential pressure flow control valves is that high pressure differential inevitably leads to high flow velocity, which brings about serious problems of vibration, erosion and noise. How to solve these problems is an important research topic placed before science and technology personnel. Figure 2 GYY high pressure regulator valve 3, the development of a new high-pressure labyrinth steam flow control valve abroad in the research on the control valve put forward some valuable ideas and methods of design. Figure 3 for the United States designed a control valve variable flow valve heart. The difference with the ordinary valve is that the flow area changes with the stroke, and the valve throttling series, the drag coefficient also decreases with the stroke becomes larger, that is, the flow area variable and the drag coefficient is inversely proportional to change. As a result, the valve core can correct the deviation of natural pressure drop in many process control systems to achieve a large pressure drop or a large pressure drop and obtain a wide range of inherent regulation. In addition, the use of multi-stage pressure drop, tortuous flow to reduce the flow rate with low noise characteristics. The actual number of flow through the fluid channel and the valve opening is proportional to the valve stroke that is just the beginning, only one flow channel exposed, and the opening close to 100%, the maximum number of exposed flow channel, the spool in the Figure Location, the black part is the actual flow channel. However, it causes other problems. For example, the throttling member uses the straight and straight connection of the vertical elbow (or inversely and inversely connected, that is, the positive right-angle elbow) to restrict the flow resistance coefficient. The sealing performance is poor and the leakage is serious. Complex, high processing costs, so this valve does not appear in the US domestic market. Figure 3, the United States designed variable flow resistance valve heart In summary, the heavy oil thermal recovery steam injection process requires a high pressure differential valve, in addition to adapt to high temperature and pressure of two-phase flow of soda medium, but also the case To high pressure, wide adjustment range, vibration, erosion and other special problems. To this end, the Xinjiang Petroleum Administration Oil Production Technology Research Institute and Tsinghua University Institute of Nuclear Technology to carry out a joint research, the guiding ideology is to maximize the resistance coefficient of the valve to achieve high pressure drop at low flow rates, radically ease Erosion and noise, get a good regulatory performance and a wide range of inherent flow regulation. The new design of the labyrinth flow control valve (declared a national patent, the valve structure shown in Figure 4) Karamay red light hot oil in the heavy oil field conducted a field test, the results shown in Figure 5. Figure 4 labyrinth flow control valve spool Figure 5 flow percentage and opening percentage curve When the valve opening changes, the flow changes gently and steadily. When the opening percentage is from 0% to 100% (travel is constantly changing), the percentage flow increases from 0% to 100%. On the contrary, the decline, the entire journey of nearly 100mm can be easily adjusted. It can be seen from the curve in Figure 5 that the valve opening percentage is approximately linear with the flow rate, so it is easy to adjust and the valve achieves a low flow rate under high differential pressure. In the valve inlet p = 9.4MPa, outlet p = 3.2MPa, the measured valve (30cm away from the valve) noise 70dB (ordinary control valve noise to 84dB or more), indicating that the labyrinth flow control valve has a good promotion and application prospects And huge economic benefits.
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