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Patent Searching and Data


Title:
SCREW DRILLING TOOL BY-PASS VALVE WITH LARGE DISPLACEMENT SPLITTING FUNCTION AND USING METHOD THEREOF
Document Type and Number:
WIPO Patent Application WO/2019/127878
Kind Code:
A1
Abstract:
Provided are a screw drilling tool by-pass valve with large displacement splitting function and a using method thereof. The screw drilling tool bypass valve comprises a valve body (1), and a primary valve core (2) and a secondary valve core (9) are arranged inside the valve body (1). A primary spring (3) is arranged between the primary valve core (2) and the secondary valve core (9), and a secondary spring (8) is arranged between the secondary valve core (9) and a valve seat (10). The secondary spring (8) has a rigidity greater than that of the primary spring (3), an inner bypass hole is provided on the primary valve core (2), and an outer bypass hole is provided on the valve body (1). The bypass valve allows the screw drilling tool to cycle and drill forward with a larger displacement, which helps to improve the rock carrying efficiency of large-sized well sections, high-angle well sections and horizontal sections, reduce drilling risks and increase drilling speed.

Inventors:
SHI YUCAI (CN)
FAN ZHIBIN (CN)
GUAN ZHICHUAN (CN)
LIU YONGWANG (CN)
YANG WEIXING (CN)
TENG ZHIXIANG (CN)
FU CHENGLIN (CN)
MIAO ZAIQIANG (CN)
Application Number:
PCT/CN2018/076932
Publication Date:
July 04, 2019
Filing Date:
February 22, 2018
Export Citation:
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Assignee:
UNIV CHINA PETROLEUM EAST CHINA (CN)
International Classes:
E21B21/10
Foreign References:
CN105178911A2015-12-23
CN206158673U2017-05-10
CN205172487U2016-04-20
CN206205834U2017-05-31
EP1161614A12001-12-12
US20060011354A12006-01-19
Attorney, Agent or Firm:
QINGDAO ZHIDILINGCHUANG PATENT AGENCY CO., LTD (CN)
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