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|1. (WO2014190518) NEGATIVE PRESSURE COMBINED-SAND-WASHING AND FORCED-SAND-DISCHARGING DEVICE|
|Applicants:||PETROCHINA COMPANY LIMITED
|Title:||NEGATIVE PRESSURE COMBINED-SAND-WASHING AND FORCED-SAND-DISCHARGING DEVICE|
A negative pressure combined-sand-washing and forced-sand-discharging device. The device is orderly connected, from top to bottom, with an oil pipe, a sleeve jet pump, a diversion valve and a sand washing pen point, the top end of the oil pipe is provided with a reverse liquid drainage outlet, the sand washing pen point is connected to the bottom end of a valve core of the diversion valve, the bottom end of the valve body of the diversion valve is connected with a leather cup/rubber cylinder combined type packer, and the sand washing pen point penetrates through a center pipe of the packer to extend to the position below the packer; the device can substantially reduce the leakage of the sand washing liquid, improves the pollution status of the oil layer, and accomplish "green" operation.