| 加拿大Mallik陆域永冻带天然气水合物成功试采回顾 |
| 投稿时间：2017-08-03 修订日期：2017-08-03 点此下载全文 |
| 引用本文：左汝强,李艺.加拿大Mallik陆域永冻带天然气水合物成功试采回顾[J].钻探工程,2017,44(8):1-12.ZUO Ru-qiang,LI Yi. The Review of Mallik NGH Successful Production Tests in Canada’s Permafrost Zone[J]. Drilling Engineering, 2017,44(8):1-12. |
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| 中文摘要:1998年由加拿大地质调查局和日本国家石油公司领导，在加拿大麦肯齐三角洲永冻带实施的Mallik 2L-38水合物研究井的项目是成功的。但是，由于气候变暖和机械故障,水合物试采目标未能完成。加拿大地质调查局和日本国家石油公司与其它8个国际合作机构于2002年回到Mallik,钻进了3L-38和4L-38两口观测井，以及5L-38生产试验井。在5L-38井中采取了水合物岩心（采取率90%）并进行物探测井等研究，实施了2次短时生产试验——运用MDT的降压法与热注入法的试验。运用热冲洗液循环的热注入法获得了470 m3的气体产量。此后， 2007—2008年又重返于1998年钻成的2L-38井，对其进行加深、扩孔、下套管等，用于实施水合物试采。2007年，在此试验井内储层射孔井段安置潛水泵，抽水降低水位以减小储层压力，在125 h的降压试验期间产生830 m3的气体。试验证明，即使在如此短的时间内，降压法也是有效的。2008年在2L-38井68 d(139 h)的长时间试采过程中，持续产气2000～4000 m3/d，总共产量达13000 m3。此次试采数据表明，降压法对于水合物生产是一种正确可取的方法。2008年加拿大Mallik天然气水物试采项目的成功，是世界水合物研究和开发史上的一座里程碑。 |
| 中文关键词:永冻带 天然气水合物 甲烷 水合物试采 热注入法 降压法 总产气量 |
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| The Review of Mallik NGH Successful Production Tests in Canada’s Permafrost Zone |
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| Abstract:The 1998 Mallik 2L-38 Hydrate Research Well Program in Canada’s Mackenzie Delta, permafrost area, led by the GSC and the Japan JNOC, was successful, but the goal of producing from NGH was not accomplished for the warming weather and mechanic failure. GSC and JNOC, as well as other 8 partners returned to Mallik in 2002. Three wells-the 3L-38 and 4L-38 observation wells, and the 5L-38 production well were drilled. Gas hydrate core was gained from the 5L-38 well at 90% core recovery and geophysical studies were conducted. Two short-duration production tests were conducted—a depressurization test with MDT tool and a thermal injection test. One encouraging result was the 470m3 of gas production by a thermal injection technique employing hot fluid circulation. Then, for the 2007—2008 Mallik production test program, the 2L-38 well, drilled in 1998, was modified to establish a production test well by reaming, deepening, casing, and cementing. An ESP was set below the perforation zone to depressurize the formation by dropping the water level in 2007. During 125h of the test, at least 830 m3 of gas flow was obtained. The test results verified the effectiveness of the depressurization method even for such a short duration. The 2008 testing program at Mallik confirmed that continuous gas flow ranging from 2000 to 4000 m3/day was maintained throughout the course of the 68 day (139 hour) test. Cumulative gas production volume was approximately 13000m3, which data confirms that the depressurization method is the correct approach for gas hydrate production. The 2008 Mallik gas hydrate production program was a landmark in hydrates R&D in the world. |
| keywords:permafrost zone Natural Gas Hydrate(NGH) methane hydrate production test thermal injection method depressurization method cumulative gas production volume |
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