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1. (WO2014190518) NEGATIVE PRESSURE COMBINED-SAND-WASHING AND FORCED-SAND-DISCHARGING DEVICE

Pub. No.:    WO/2014/190518    International Application No.:    PCT/CN2013/076468
Publication Date: Fri Dec 05 00:59:59 CET 2014 International Filing Date: Fri May 31 01:59:59 CEST 2013
IPC: E21B 21/00
Applicants: PETROCHINA COMPANY LIMITED
中国石油天然气股份有限公司
Inventors: GUAN, Jiuzhou
管九洲
WANG, Shuhui
王书慧
YANG, Yanhui
杨艳辉
WANG, Wendao
王文道
YANG, Jie
杨洁
Title: NEGATIVE PRESSURE COMBINED-SAND-WASHING AND FORCED-SAND-DISCHARGING DEVICE
Abstract:
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.