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A lateral force detector in oil well based on the principle of arbitrarily stress composition
LIU Bao1, FENG Julong1,2, LI Zhe1, WANG Lei3
(1.College of Information and Engineering in China University of Petroleum(East China), Qingdao 266580, China;2.China Automotive Technology & Research Center, Tianjin 300300, China;3.Drilling Design Institute of Jidong Oilfied, CNPC, Tangshan 063000, China)
Abstract:
During oil production, pipe leakage and rod breakage are often caused by eccentric wear of rod and tube, thus can affect significantly the productivity of oil fields. At the extrusion, the lateral contact force between the sucker rod and the inner wall of the tubing is the key to understanding eccentric wear prevention. Firstly, from the principle of force decomposition and addition, a method to measuring arbitrarily stress addition is presented in this paper. Then a lateral force detector is designed based on this method, which includes three parts:the mechanical parts, the hardware circuit and the software program. Among them, the mechanical parts are designed according to the connection form of the actual tubing coupling, which is fixed in the well between two sections of tubing. The hardware circuit is responsible for filtering, amplifying, A/D converting, storing, and communication of the weak voltage signals from the bridge detector. The software program includes lower computer and upper computing programs, which are responsible for data acquisition, storage, and communication; and data conversion and analysis, respectively. Finally, the results obtained both in the lab and in the oil field show that the proposed lateral force detecting method is scientifically sound, and the designed lateral force detector can meet the field requirements in strength, pressure resistance, temperature resistance and measurement accuracy, and may provide significant reference for future studies in prevention of the eccentric wear of sucker rod in oil field.
Key words:  eccentric wear of rod and tube  lateral force  stress measurement  detector design