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DOI
: 10.3969/j.issn.2096-1693.2021.03.033
徑向井降壓開采天然氣水合物產(chǎn)能模擬
張潘潘 ,，田守嶒,，張逸群 ,，李根生 ，武曉亞,，王宇豪
1 中國石油大學(xué)(北京)油氣資源與探測國家重點實驗室,，北京 102249 2 中國石油大學(xué)(北京)克拉瑪依校區(qū)，克拉瑪依,，834000 3 中石化江鉆石油機械有限公司,，武漢 430000
Production simulation of natural gas hydrate using radial well depressurization
ZHANG Panpan1 , TIAN Shouceng1,2, ZHANG Yiqun , LI Gensheng, WU Xiaoya, WANG Yuhao
1 State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum-Beijing, Beijing 102249, China 2 China University of Petroleum-Beijing at Karamay, Karamay 834000, China 3 Jiangzuan Company of Petroleum Machinery Company Limited of Sinopec, Wuhan 430000, China
文章導(dǎo)讀 ??
摘要 ?
天然氣水合物是一種清潔高效的潛在替代能源，提高開采效率對促進其產(chǎn)業(yè)化發(fā)展具有重要意義,。本文
借助開源程序HydrateResSim,，針對具有強封閉性邊界的第三類水合物藏薄層進行了直井和徑向井降壓開采天然
氣水合物產(chǎn)能模擬，對比了直井和徑向井降壓開采過程中溫度場,、壓力場,、水合物飽和度及產(chǎn)能變化規(guī)律，分
析了徑向井降壓開采增產(chǎn)機理,。模擬發(fā)現(xiàn)徑向井降壓開采能夠顯著降低近井區(qū)域的滲流阻力,，增加儲層中的有
效泄流面積。通過促進壓降向儲層內(nèi)部傳播,，徑向井不僅擴大了水合物的分解范圍,，也減緩了開采過程中水合
物的二次生成。由于水合物的分解是一個吸熱過程,，徑向井開采水合物時所產(chǎn)生的低溫區(qū)域不僅范圍更大,，且
溫度更低。相同壓降條件下,，徑向井開采 1000 d時累計產(chǎn)氣量超過 25 萬m3
,，是直井的 3 倍以上，累計產(chǎn)氣產(chǎn)
水比超過 60,，約為直井的 2 倍,，表現(xiàn)出較好的增產(chǎn)潛力。研究表明徑向井能顯著提高水合物產(chǎn)能,，有助于促進
我國南海水合物早日實現(xiàn)商業(yè)化開發(fā)。
關(guān)鍵詞 ：
天然氣水合物；徑向井,；降壓法,；產(chǎn)能模擬；中國南海
Abstract ：
Natural gas hydrate is a potential alternative source of energy for the future, and improving the extraction efficiency
is of great significance to promote its industrial development. In this study, productivity simulation of natural gas hydrate by
radial well depressurization and vertical well depressurization is studied with the use of HydrateResSim. This numerical model
was developed for thin layers of Class 3 hydrate reservoirs with closed boundaries. By comparing the changes of temperature,
pressure and hydrate saturation during gas production by a vertical well and a four-branch radial well, the reservoir stimulation
mechanism of radial wells is investigated. We find that depressurization through radial wells can significantly reduce the seepage
resistance in the near-well area and increase the effective drainage area. Besides, radial wells can promote the propagation of
pressure drop to the inside of the reservoir, which expands the region of hydrate dissociation and slows down the secondary
formation of hydrate. The decomposition of hydrate is an endothermic process. Therefore, the low temperature area generated
in the hydrate extraction process by a radial well has a larger range and has a more significant temperature drop. Under the same
pressure drop, radial wells’ cumulative gas production exceeds 250 thousand cubic meters during 1,000 days’ production, which
is more than three times that of the vertical well. The cumulative gas-to-water ratio of the radial well exceeds 60, which is about
twice that of the vertical well. Results show that radial wells can significantly improve hydrate recovery efficiency, which helps
to promote the commercial exploitation of hydrates in the South China Sea.
Key words ：
natural gas hydrate; radial well; depressurization method; production simulation; South China Sea.
收稿日期: 2021-09-29
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基金資助: 國家自然科學(xué)基金國際( 地區(qū)) 合作與交流項目(41961144026),、國家自然科學(xué)基金青年基金(51804320),、國家自然科學(xué)基金重大項目課題
通訊作者:
[email protected]
引用本文: ??
張潘潘, 田守嶒, 張逸群, 李根生, 武曉亞, 王宇豪. 徑向井降壓開采天然氣水合物產(chǎn)能模擬. 石油科學(xué)通報, 2021, 03: 417-428 ZHANG Panpan, TIAN Shouceng, ZHANG Yiqun, LI Gensheng, WU Xiaoya, WANG Yuhao. Production simulation of natural gas hydrate using radial well depressurization. Petroleum Science Bulletin, 2021, 03: 417-428.
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