A choke valve for downhole liquid level control
A technology of liquid level control and throttle valve, which is applied in wellbore/well valve devices, wellbore/well components, earthwork drilling and production, etc. It can solve the problems of high cost, short life of downhole sensors, and inability to detect casing water at any time. Flood level and other problems, to achieve the effect of convenient connection, simple structure, and small sliding friction
Active Publication Date: 2017-10-10
CHINA PETROCHEMICAL CORP +1
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Problems solved by technology
Nowadays, there are two main methods of downhole liquid level detection and control. One is the acoustic wave detection method, which can only measure the static liquid level of the oil well, but cannot detect the water flooded liquid level of the gas well that is out of the casing at any time; the other is the downhole pressure sensor. , due to the need to place downhole for a long time and real-time data transmission, downhole sensors have the disadvantages of short life and high cost
Method used
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[0017] Attached below figure 1 , attached figure 2 And attached image 3 The present invention is further described:
[0018] The valve body 4 of a throttle valve used for underground liquid level control is cylindrical, and the radial direction of the valve body 4 is processed with a valve core hole, and the valve core 13 and the valve core hole are sealed by a sealing ring 12; one end of the valve core 13 is Compression spring 6 and adjusting bolt 5, the other end is limit washer 14; Adjusting bolt 5 can adjust the active force of compression spring 6 and as the left limit of spool 13; Limit washer 14 is the right limit of spool 13 position; the limit gasket 14 is processed with a through hole, which connects the outer annular space of the valve body 4 with the right end of the valve core 13; groove.
[0019] The upper part of the valve body 4 is connected to the outer pipe A1, and there is an inner pipe A2 inside the outer pipe A1, and the inner pipe A2 is connected to...
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The invention discloses a throttle valve for downhole liquid level control. The throttle valve comprises a valve body, a valve element, an adjusting bolt, a compression spring, a seal ring and a limiting gasket. A valve element hole is processed in the valve body radially. The valve element is of a slide valve structure, and an oil groove, a seal ring groove and a reinjection water groove are processed in the valve element. A reinjection water channel and a gas generation channel are processed on the valve body radially. The adjusting bolt can adjust acting force of the compression spring. A through hole processed in the limiting gasket is communicated with the external annular space of the valve body and the right end of the valve element. The throttle valve simple in structure and convenient to connect is used for downhole liquid level control of a drainage gas recovery well to prevent pump burning caused by dry grinding of a reinjection pump.
Description
technical field [0001] The invention relates to the field of choke valves, in particular to a choke valve used for downhole liquid level control in downhole gas-liquid separation and co-well reinjection natural gas wells. Background technique [0002] Water flooding of gas wells is one of the main problems restricting natural gas production, especially in the process of exploitation of shallow natural gas reservoirs, the contradiction caused by insufficient energy of gas reservoirs is more prominent. Using downhole gas-liquid separation and reinjection technology, the water in natural gas can be separated downhole and directly reinjected into the formation. Downhole separation and reinjection technology has the following advantages compared with other methods of drainage and gas recovery: ①It can greatly reduce the liquid production rate and water content of high water-cut gas wells, thereby greatly reducing the lifting cost and operating cost; ②Save the cost of surface wate...
Claims
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IPC IPC(8): E21B34/06
CPCE21B34/08
Inventor 朱焕刚李建成张莹李宗清宋中文于海叶许萍赵绪龙李建新苗智瑜孙宇于铁军
Owner CHINA PETROCHEMICAL CORP