US 11,982,166 B2
System for segmented simultaneous water injection and oil recovery through double pipes in horizontal section
Pingtian Fan, Yan'an (CN); Yuetian Liu, Yan'an (CN); Weichu Yu, Yan'an (CN); Ping Li, Yan'an (CN); Yongdong Wang, Yan'an (CN); Ying Zhang, Yan'an (CN); Baolin Guan, Yan'an (CN); Fengping Yan, Yan'an (CN); Yuanping Hu, Yan'an (CN); and Min Sun, Yan'an (CN)
Assigned to Nanniwan Oil Production Plant, Yanchang Oilfield Co., Ltd., Yan'an (CN)
Filed by Nanniwan Oil Production Plant, Yanchang Oilfield Co., Ltd., Yan'an (CN)
Filed on Sep. 8, 2022, as Appl. No. 17/940,602.
Claims priority of application No. 202210523436.3 (CN), filed on May 13, 2022.
Prior Publication US 2023/0366302 A1, Nov. 16, 2023
Int. Cl. E21B 43/20 (2006.01); E21B 17/07 (2006.01); E21B 33/128 (2006.01); E21B 34/08 (2006.01)
CPC E21B 43/20 (2013.01) [E21B 17/07 (2013.01); E21B 33/1285 (2013.01); E21B 34/08 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A system for segmented simultaneous water injection and oil recovery through double pipes in horizontal section, comprising a plurality of packers, a plurality of oil-extracting mechanisms and a plurality of water-injection mechanisms, wherein each of the plurality of packers, each of the plurality of oil-extracting mechanisms, and each of the plurality of water-injection mechanisms has an injection channel and a production channel, when the plurality of packers, the plurality of oil-extracting mechanisms and the plurality of water-injection mechanisms are combined, each of the injection channels is connected in turn, and each of the production channels is also connected in turn, the plurality of oil-extracting mechanisms extract oil through the production channels, the plurality of water-injection mechanisms inject water through the injection channels, wherein, each of the plurality of oil-extracting mechanisms is arranged between two adjacent packers, and each of the plurality of water-injection mechanisms is also arranged between two adjacent packers;
wherein each of the plurality of packers comprises a central tube and a first inner tube, two ends of the central tube are respectively connected with a first inner tube upper joint and a first inner tube lower joint, a first outer pipe upper joint is fixed on a shoulder of the first inner tube upper joint, a first gap is defined between the first outer pipe upper joint and the first inner tube upper joint, a plurality of first flow holes are defined in the first inner tube upper joint, the plurality of first flow holes are used to connect a second gap between the central tube and the first inner tube, the first inner tube lower joint is provided with a second flow hole, the central tube is provided with an expandable cartridge, both ends of the expandable cartridge are respectively connected with a rubber barrel upper sheath and a rubber barrel lower sheath with threads, a third gap is formed between the central tube and the expandable cartridge, the first outer pipe upper joint is arranged in the rubber barrel upper sheath, a first outer pipe lower joint is arranged in the rubber barrel lower sheath, a fourth gap is formed between the first outer pipe lower joint and the first inner tube lower joint, two ends of the central tube are respectively distributed with at least one hole along the circumferential direction, and corresponding two ends of the first inner tube are provided with a plurality of lobes, a diversion hole is defined in each of the plurality of lobes, a set and lock capsule is installed outside the diversion hole, and the set and lock capsule is pressed by a thread engagement of a capsule bolt and a capsule cap, and the set and lock capsule is used to seal each of the plurality of diversion holes, a plurality of unsealing pins are installed on the rubber barrel lower sheath, and the plurality of unsealing pins fit with corresponding grooves defined in the first outer pipe lower joint.