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| 一种新型绕煤层固井井下装置的研制 |
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熊建华1,2,黄中伟3,李根生3,史怀忠3,王开龙4,申瑞臣4,金磊4
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(1.中国石油大学石油工程学院，山东青岛266580 ;2.中国石油化工股份有限公司江苏油田分公司试采一厂， 江苏江都225265;3.中国石油大学石油工程学院，北京102249 ;4.中国石油集团钻井工程技术研究院，北京100195)
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| 摘要: |
| 针对煤层气井常规套管完并时水泥浆污染煤层的问题，提出一套绕煤层固井技术方案，设计研制一种新型结 构的绕煤层固井井下装置;测试整套装置的耐压性，计算水泥浆通过该装置时的局部流体压耗。测试及计算结果表 明:该装置可承受28 MPa的管内压力，额外增加的循环压耗约为2. 2 MPa,可以满足施工需要;卞人套管时，把多组 装置连接在套管串上对应煤层的位置，即可实现水泥浆仅封固非煤层段，避免水泥浆和煤层的接触，从而避免水泥 浆对煤层的污染，为煤层气井及油气井低压层段提供一种新的完井手段。 |
| 关键词: 煤层气 固井 绕煤层 水泥浆 污染 |
| DOI：10.3969/j.issn.1673-5005.2012.04.019 |
| 分类号:TE 25 |
| 基金项目:国家重大专项课题(2011ZX05037-001) |
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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 |
