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| A new bypass coalbed cementing downhole device for coalbed methane well |
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XIONG Jian-hua1,2,HUANG Zhong-wei3,LI Gen-sheng3,SHI Huai-zhong3,WANG Kai-long4,SHEN Rui-chen4,JIN Lei3
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(1. School of Petroleum Engineering in China University of Petroleum, Qingdao 266580，China ;2.lsf Oil Production Plant of Jiangsu Oilfield Company, SINOPEC，Jiangdu 225265, China ;3.College of Petroleum Engineering in China University of Petroleum, Beijing 102249，China ;4. Research Inxtitute of Drilling Engineering, CNPC, Beijing 100195, China)
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| Abstract: |
| To avoid the cementing damage to the coal bed in casing completion, a new bypass coalbed cementing downhole device for coalbed methane well was presented. The pressure resistance was measured and local pressure drop of the cementing slurry flowing along the device was calculated. The results show that the device can bear inner pressure of 28 MPa，and the extra circulate pressure drop is about 2.2 MPa, which can satisfy the field requirement. In casing completion operations, multiple tools should be connected to the casing string at the corresponding coal intervals，which can realize cementing slurry bypassing such target sections and avoid damage to coalbed. This technology provides a new completion method in coal methane wells or oil wells with lower pore pressure intervals. |
| Key words: coalbed methane cementing bypassing coalbed |
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