US 11,719,070 B1
Preset three-stage adjustable downhole choke with choking and pressure measurement functions
Xin Guo, Chengdu (CN); Zechuan Huang, Chengdu (CN); Wu Zhao, Chengdu (CN); Kai Zhang, Yibin (CN); Miao Yu, Yibin (CN); Yiwei Jiang, Chengdu (CN); Mingyue Yang, Chengdu (CN); Chong Jiang, Chengdu (CN); Bing Lai, Chengdu (CN); Xingyu Chen, Chengdu (CN); Bo Wu, Chengdu (CN); and Jun Li, Chengdu (CN)
Assigned to SICHUAN UNIVERSITY, Chengdu (CN); and Yibin Industrial Technology Research Institute of Sichuan University, Yibin (CN)
Filed by SICHUAN UNIVERSITY, Chengdu (CN); and Yibin Industrial Technology Research Institute of Sichuan University, Yibin (CN)
Filed on Feb. 26, 2023, as Appl. No. 18/174,637.
Claims priority of application No. 202210256998.8 (CN), filed on Mar. 16, 2022.
Int. Cl. E21B 34/06 (2006.01); E21B 43/08 (2006.01)
CPC E21B 34/066 (2013.01) [E21B 43/08 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A preset three-stage adjustable downhole choke with choking and pressure measurement functions, comprising an intake assembly for natural gas filtration, an electrically-controlled telescopic assembly for positioning and clamping the downhole choke with a prefabricated seating nipple, and a three-stage choking assembly for natural gas choking and depressurization, wherein the intake assembly, the electrically-controlled telescopic assembly, and the three-stage choking assembly are sequentially communicated from bottom to top; and a first-stage control choke (30), a second-stage adjustable control choke (29), and a third-stage control choke (28) are sequentially provided in a gas passage of the three-stage choking assembly from bottom to top;
the three-stage choking assembly comprises an outer pipe string (15) with a lower end connected to an upper end of the electrically-controlled telescopic assembly; an inner pipe string (17) is nested in the outer pipe string (15); a central boss of the inner pipe string (17) is threaded with the first-stage control choke (30); an intermediate pipe string (16) is nested between the outer pipe string (15) and the inner pipe string (17); an upper part of the intermediate pipe string (16) is provided with the second-stage adjustable control choke (29); a lower part of the second-stage adjustable control choke (29) is provided with a second-stage control choke placement sleeve (20); and a lower part of the second-stage control choke placement sleeve (20) is fixedly connected to an upper part of the inner pipe string (17); and
the second-stage adjustable control choke (29) comprises a bottom annulus (34) and a top annulus (35); a rotary table (36) is provided in the bottom annulus (34); a plurality of blades (37) are uniformly distributed between the rotary table (36) and the top annulus (35); upper and lower ends of each of the blades (37) are provided with positioning posts (38), respectively; the positioning posts (38) are arranged in track slots (39) on the top annulus (35) and the rotary table (36), respectively; a choking shell (40) is provided between the bottom annulus (34) and the top annulus (35); an outer shell (41) is sleeved outside the choking shell (40); a bottom part of the outer shell (41) is fixedly connected to a top part of the second-stage control choke placement sleeve (20); a gear (42) meshing with an outer edge of the rotary table (36) is further provided in the bottom annulus (34); the gear (42) is dynamically connected to a rotating shaft (19); the rotating shaft (19) is drivingly connected to a rotating motor (18); the rotating motor (18) is provided between the upper part of the intermediate pipe string (16) and the upper part of the inner pipe string (17); and the rotating motor (18) is connected to an electrical control system assembly (12) in an electrical control manner.