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Title:
LIMITED-STAGE DISCONTINUOUS AND DUAL-SPIRAL STRING FOR MIXTURE OF SAND AND LIQUID AT WELL BOTTOM
Document Type and Number:
WIPO Patent Application WO/2018/040139
Kind Code:
A1
Abstract:
Disclosed is a limited-stage discontinuous and dual-spiral string for a mixture of sand and liquid at a well bottom, the string comprising a first stage oil tube (1) and an nth stage oil tube (9) which are connected in sequence from the well head to the well bottom, wherein a plurality of dual-spiral pup joints and oil tubes are provided between the first stage oil tube (1) and the nth stage oil tube (9), the dual-spiral pup joints and the oil tubes being connected alternately. An upper dual-spiral pup joint (12) and an upper hydraulic ejector (13) are connected in sequence at a lower end of the n-th stage oil tube (9), a lower dual-spiral pup joint (15) and a lower hydraulic ejector (16) are connected in sequence at a lower end of the upper hydraulic ejector (13), an expansion compensator (18) is connected at a lower end of the lower hydraulic ejector (16), and a bottom dragging fracturing packer (19) is connected at a lower end of the expansion compensator (18). By utilizing the string, a large amount of liquid with sand at a high flow rate moves in a spiral flow state along a spiral flow channel and an effective sand concentration is ensured, maintaining the concentration of sand entering the ejectors upstream and downstream of a multi-stage clustering perforation in a stable condition, thus improving the perforation effect.

Inventors:
TONG, Shaokai (Room1207 Changqing buildi Xinglongyuan Residential Quarter Weiyang District, Xi'an, Shaanxi 8, 710018, CN)
WANG, Zuwen (Room1207 Changqing buildi Xinglongyuan Residential Quarter Weiyang District, Xi'an, Shaanxi 8, 710018, CN)
YUE, Yangfang (Room1207 Changqing buildi Xinglongyuan Residential Quarter Weiyang District, Xi'an, Shaanxi 8, 710018, CN)
BAI, Mingwei (Room1207 Changqing buildi Xinglongyuan Residential Quarter Weiyang District, Xi'an, Shaanxi 8, 710018, CN)
WEN, Yakui (Room1207 Changqing buildi Xinglongyuan Residential Quarter Weiyang District, Xi'an, Shaanxi 8, 710018, CN)
ZHANG, Mian (Room1207 Changqing buildi Xinglongyuan Residential Quarter Weiyang District, Xi'an, Shaanxi 8, 710018, CN)
YANG, Hongbin (Room1207 Changqing buildi Xinglongyuan Residential Quarter Weiyang District, Xi'an, Shaanxi 8, 710018, CN)
Application Number:
CN2016/099268
Publication Date:
March 08, 2018
Filing Date:
September 19, 2016
Export Citation:
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Assignee:
CHINA NATIONAL PETROLEUM CORPORATION CHUANQING DRILLING ENGINEERING COMPANY LIMITED CHANGQING DOWNHOLE TECHNOLOGY COMPANY (Room1207 Changqing buildi Xinglongyuan Residential Quarter Weiyang Distric, Xi'an, Shaanxi 8, 710018, CN)
International Classes:
E21B43/114
Domestic Patent References:
WO2008061071A22008-05-22
Foreign References:
CN105649598A2016-06-08
CN205445573U2016-08-10
Attorney, Agent or Firm:
XI'AN JISHENG PATENT AGENCY CO., LTD (Innovation Business Apartment Building 1-11610, Jin Ye Road High-tech Zon, Xi'an Shaanxi 5, 710075, CN)
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