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研究生:蘇意傑
研究生(外文):Yi-JieSu
論文名稱:岩石力學機制對自然裂縫地層裂縫滲透率影響之研究
論文名稱(外文):Study of Geomechanical Effects on Fracture Permeability in Naturally Fractured Reservoirs
指導教授:謝秉志
指導教授(外文):Bieng-Zih Hsieh
學位類別:碩士
校院名稱:國立成功大學
系所名稱:資源工程學系碩博士班
學門:工程學門
學類:材料工程學類
論文種類:學術論文
論文出版年:2012
畢業學年度:100
語文別:中文
論文頁數:87
中文關鍵詞:自然裂縫地層應力敏感性岩石力學彈性係數
外文關鍵詞:naturally fractured reservoirsstress-sensitivegeomechanicselastic parameter
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  • 被引用被引用:0
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本研究的主要目的是以解析法研究岩石力學機制對自然裂縫地層之裂縫滲透率及其壓力反應之影響。
本研究以Jabbari理論為基礎,針對其壓力解析解中的彈性函數積分項進行函數特性分析並推導出近似式。然後推導出應力敏感性自然裂縫地層之暫態壓力近似解。本研究也推導出壓力反應之前、後期階段之視直線壓力解,以及研究前期階段結束時間、後期階段開始時間與裂縫特性參數之關係。利用所推導的壓力解,本研究建立了裂縫特性參數與彈性參數之分析程序,並利用案例分析來驗證所推導之方程式與參數分析程序。
本研究所獲得之主要結果為:(1)本研究推導出應力敏感性自然裂縫地層之壓力近似解,並推導出壓力反應前期階段及後期階段之視直線壓力解,而改善Jabbari理論並有助於應力敏感性自然裂縫地層之井壓測試分析。(2)利用所推導之前期階段與後期階段的視直線壓力解,使之與完整壓力解比對,並設定無因次壓力偏離值為0.1 以作為前期階段結束時間與後期階段開始時間的分析判斷準則,利用迴歸分析而得其與裂縫特性參數之關係為:t_Da≅0.157*ω/λ、t_Db≅1.042*1/λ 。(3)由案例研究之結果可知,利用本研究所建立之裂縫特性參數分析流程所推求之地層參數結果與現場資料(在案例中為產生一組生產資料所使用之設定值)相當接近,而證實本研究模式之可用性。(4)在生產過程中,受到應力影響時,會相對的減少生產所需壓力差使得壓力反應前期階段與後期階段皆出現視直線效應,但兩條視直線不會平行。若使用傳統壓力分析方法針對後期階段之視直線進行滲透率推求,會產生過度高估的結果。
The purpose of this study was to use an analytical method to study the geomechanical effects on the fracture permeability and pressure response in stress-sensitive naturally fractured reservoirs.
The characteristic properties and the approximate expression of the elastic intergral function, which was derived in Jabbari’s theory for stress-sensitive naturally fractured reservoirs, was analyzed and studied. The approximate solution of the bottom-hole pressure for the Jabbari theory was derived. The apparent linear equations for the early time and late time regions were then derived, as well as the equations for the starting time and ending time of the transition region. Based on the equations derived in this study, the estimation procedures for the fracture characteristic parameters and the elastic parameter of stress-sensitive naturally fractured reservoirs were established. A case study was used to validate the derived equations and the estimate procedures.
The major results and conclusions obtained from this study are:(1)The approximate pressure solution for stress-sensitive reservoirs was derived. The apprent linear equations for the early time and late time regions were derived to improve the application of Jabbari’s theory in well testing analysis.(2)The equations for estimating the starting time and ending time of the transition regions were derived and can be expressed as:t_Da≅0.157*ω/λ and t_Db≅1.042*1/λ. The criteria used to analyze the the starting time and ending time of the transition regions was the dimensionless pressure of 0.1.(3)The estimation procedures established in this study for analyzing the fracture characteristic parameters and the elastic parameter of stress-sensitive naturally fractured reservoirs were validated from the case study analysis.(4)The pressure drop of stress-sensitive reservoirs was smaller than that of non- stress-sensitive(traditional) reservoirs. The pressure responses were not parallel straight lines in the early time and late time regions in stress-sensitive reservoirs. The formation permeability might be overestimated when traditional well testing analysis is used.
中文摘要------------------------------------------I
英文摘要------------------------------------------III
誌謝---------------------------------------------V
目錄---------------------------------------------VII
表目錄-------------------------------------------X
圖目錄-------------------------------------------XI
符號表-------------------------------------------XIV
第一章 緒論-------------------------------------1
1.1自然裂縫地層-----------------------------------2
1.2應力敏感性地層----------------------------------4
第二章 研究目的----------------------------------6
第三章 文獻回顧----------------------------------7
3.1自然裂縫地層------------------------------------7
3.2應力敏感性地層----------------------------------13
第四章 理論基礎----------------------------------17
4.1自然裂縫地層暫態壓力解析解------------------------17
4.2應力敏感性自然裂縫地層暫態壓力解析解----------------22
4.2.1裂縫寬度受應力影響之關係式----------------------22
4.2.1.1裂縫系統孔隙體積壓縮度-----------------------23
4.2.1.2由力學彈性模數控制的基質壓縮度 -----------------24
4.2.1.3受地層應力影響之裂縫寬度總改變量---------------26
4.2.2裂縫滲透率與裂縫寬度及基質尺寸之關係式------------26
4.2.3裂縫滲透率與壓力變化之關係式--------------------28
4.2.4應力敏感性自然裂縫地層暫態壓力解析解--------------29
4.3應力敏感性自然裂縫地層暫態壓力近似解(本研究推導
之模式)---------------------------------------34
4.3.1應力敏感性自然裂縫地層暫態壓力視直線段近似解-------36
4.3.1.1前期階段之視直線近似解-----------------------37
4.3.1.2後期階段之視直線近似解-----------------------39
4.3.2應力敏感性自然裂縫地層前期階段結束時間與後期階段開始
時間----------------------------------------41
4.3.3自然裂縫特性參數推求流程-----------------------42
第五章 結果-------------------------------------44
5.1自行推導之暫態壓力近似解與文獻解析解驗證------------44
5.2應力敏感性自然裂縫地層暫態壓力近似解---------------45
5.2.1前期階段之視直線近似解-------------------------45
5.2.2後期階段之視直線近似解-------------------------45
5.2.3前期階段結束時間與後期階段開始時間---------------46
5.3案例研究---------------------------------------47
第六章 討論-------------------------------------50
6.1使用後段視直線進行參數分析流程適用性探討------------50
6.2定注入率操作條件之案例研究------------------------52
6.3不含岩石力學機制之案例研究(傳統自然裂縫地層)-------54
6.4使用傳統壓力分析法所產生的誤差量-------------------55
6.5常數c1及c2值域適用度----------------------------56
6.6裂縫特性參數對壓力行為之影響----------------------57
第七章 結論與建議--------------------------------58
7.1結論------------------------------------------58
7.2建議------------------------------------------59
參考文獻------------------------------------------60
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17.Mckee, C.R., Bumb, A.C., and Koenlg R.A.: “Stress-Dependent Permeability and Porosity of Coal and other Geologic Formations, SPE Formation Evaluation pp. 81-91, March 1988.
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20.Olarewaju, J.S., Lee, W.J.: “New Pressure-Transient Analysis Model for Dual-Porosity Reservoirs, SPE Formation Evaluation, pp. 384-388, September 1989.
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