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Design and Study on the Downhole Hydrocyclone

Author: MaoLi
Tutor: XuYiJi；ChenYongQi
School: China University of Petroleum
Course: Petroleum and Natural Gas
Keywords: Downhole hydrocyclone The separating of solid phase The design of structure Improve rate of penetrate
CLC: TE921
Type: Master's thesis
Year: 2011
Downloads: 85
Quote: 0
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Abstract


With the deepening of drilling depth, we must add the heavy weight additive (such as barite) in drilling fluid , to increase the density of drilling fluid. So can increase hole stability , avoid differential pressured and reservoir protection. But as the fluid density increases, the drilling rate will decrease, significantly increasing the bit wear. In order to reduce the solid concentration of fluid into the bit, we propose a kind of new technique of solids control to separate solid phase from drilling fluid underground.Because of the limit of drilling surroundings under the wells, according to the structure feature of the hydrocyclone we choose it as the device of separating the solid phase. Combining to existing information, we get the structure parameter such as the taper angle of the hydrocyclone, the diameter of the hydrocyclone, the diameter of the feeding hole, the inner diameter of the flooding pipe, the thickness of the flooding pipe, diameter of the bottom headpiece and so on. We design a kind of runner with double curve entrance that the fluid pass the rotational flow tune tangential. At the same time we increase a jet at the undercurrent outlet. By means of changing the diameter of the jet we can adjust the diameter of the undercurrent outlet. Then we reduce the size of the device and get a prototype for experiment. We at last proving the separating effectiveness of the device through the laboratory experiment.

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CLC: > Industrial Technology > Oil and gas industry > Oil machinery and equipment and automation > Drilling machinery equipment > Drill bits,drilling tools
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