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| Design and jet impingement characteristics of downhole self-excited pulsed jet energyenhancing device |
| 1.College of Mechanical and Electronic Engineering, China University of Petroleum, Qingdao, Shandong 257061, China; 2. Xinjiang Oil Field Company, PetroChina Company Limited, Karamay, Xinjiang 834000, China |
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Abstract Combined with the principle of eddy current energy steering impact and feedback channel forced steering, the wall attachment effect was used to develop a new type of downhole selfexcited pulsed jet energyenhancing device. The structure parameters of the device were numerically simulated by the control variable method, and the pulsation characteristics of the pulsed jet for different structures and operating parameters were analyzed. A prototype was fabricated and tested in the laboratory. The research results show that when the ratio of inlet to outlet diameter is 0.71-1.18, the pulse effect is good. With the increasing of ratio of inlet to outlet diameter, the pulse frequency shows increasing trend, and the pulsating pressure amplitude shows downward trend with the maximum pressure amplitude of 10.20 MPa. With the increasing of spray distance of manifold, the pulse frequency is increased firstly with latter decreasing, while the pulsating pressure amplitude is decreased firstly with latter increasing. With the increasing of feedback channel crosssection ratio, the pulse frequency is gradually increased, while the pressure amplitude remains basically unchanged. The diameter change of the eddy current commutation circle has little effect on pulse frequency and pulsating pressure amplitude. The pulse frequency is increased with the increasing of Reynolds number of incoming flow. When Reynolds number is greater than 3.56×105, the frequency basically no longer increases. The amplitude of pulsating pressure is increased with the increasing of Reynolds number of incoming flow.
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