| 研究生: |
林彥甫 Lin, Yen-fu |
|---|---|
| 論文名稱: |
受井壁污損的天然氣生產井增產之研究 Improved Gas Recovery from Wells with Wellbore Damage |
| 指導教授: |
林再興
Lin, Zsay-shing |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 資源工程學系 Department of Resources Engineering |
| 論文出版年: | 2009 |
| 畢業學年度: | 97 |
| 語文別: | 中文 |
| 論文頁數: | 129 |
| 中文關鍵詞: | 地層污損 、膚表因子 、低產能生產井 、地層污損評估指標 、酸處理 、剩餘可採收量 |
| 外文關鍵詞: | low productivity wells, improved gas reserve, formation damage, skin factor, acidizing treatment, R-factor |
| 相關次數: | 點閱:120 下載:2 |
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地層污損是造成生產井產能降低的主要原因之一。地層污損的程度可以用膚表因子來表示。要降低受污損生產井的膚表因子,可使用井激勵處理技術,而井激勵方法之一是使用酸處理法改變膚表因子,進而增加產量。本研究主要目的是估算C氣田礦區W生產層之生產井的地層污損程度(膚表因子),研究目前生產井若經過酸處理後,改變其膚表因子,模擬計算未來可增產的天然氣量。
本研究先利用解析法分析各個生產井的井壓測試資料,計算出生產井之膚表因子後,並利用地層污損評估指標(R-factor)計算出欲進行酸處理之候選井,再建立整個儲氣層的數值模式,完成壓力及產水量歷史調諧,獲得C氣田的數值模式,並利用完成歷史調諧之數值模式進行未來產量預測。
本研究分析六口生產井之壓力測試資料求得膚表因子,再計算地層污損評估指標(R-factor),由於各井的污損指標均大於0.6,因此判定均可作為酸處理候選井。但其中兩口生產井之生產設備已不堪使用,無法恢復生產,所以僅針對其餘四口可生產之生產井,改變其膚表因子以進行增產之研究。
而未來產量預測結果為:C-110S號井在作過酸處理後(假設膚表因子減少75%)可得最終累積產氣量2.87×1011(SCF),剩餘可採收量為2.46×1011(SCF);C-126S號井在作過酸處理後(假設膚表因子減少75%)可得最終累積產氣量1.40×1011(SCF),剩餘可採收量為1.20×1011(SCF);C-127L號井在作過酸處理後(假設膚表因子減少75%)可得最終累積產氣量8.81×1010(SCF),剩餘可採收量為0.85×1011(SCF) ;唯C-112(L&S)號井在酸處理前後都沒有增加採收量,原因是該井產水率大於150STB/D(超出本研究之生產終止條件,故停止生產),其最終累積產氣量2.67×1010(SCF),剩餘可採收量為0.15×1010(SCF)。由上述結果得知, C-110S號井、C-126S號井、C-127L號井適合進行酸處理,可達到增產之目的;而C-112(L&S)號井,即使對其作酸處理,也無增產之效益。
The formation damage is the major reason to cause low productivity in a producing well. The formation damage can be estimated by the skin factor which could be removed by acidizing treatment.
The purpose of this study is to estimate skin factor from pressure test data of the wells and to study the improved gas recovery of low productivity wells after acidizing treatment for the C gas reservoir in Taiwan. The major works in this study include: (1) using the conventional analysis method to analyze pressure test data of testing wells and to estimate permabilities and skin factors; (2) choosing the candidate wells among the wells analyzed by R-factor method; (3) conducting a numerical model of C gas reservoir matching the field data and simulated data of pressure and water production; (4) predicting the improved gas recovery of the candidate wells after acidizing treatment.
Based on the results from this study, four wells were chosen for analyzing pressure data to obtain permeabilities and skins. The R-factors estimated for C-110S, C-126S, C-127L and C-112(L&S) were 0.86, 0.90, 0.84, and 0.83, respectively. The improved gas reserve of four candidate wells after acidizing treatment is 2.46×1011 (SCF), 1.20×1011(SCF), 0.85×1011 (SCF) and 0.15×1010 (SCF), respectively.
The results showed that the wells of C-110S, C-126S and C-127L can be acidized to achieve the purpose of improved gas recovery; C-112(L&S) well is not.
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