[1]崔云海  劉厚彬  楊海平  馬天壽.焦石壩頁巖氣儲層水平井井壁失穩機理[J].石油鉆采工藝,2016,38(5):545-552.[doi:10.13639/j.odpt.2016.05.001]
 CUI Yunhai,LIU Houbin,YANG Haiping,et al.Mechanisms of sidewall stability loss in horizontal wells drilled for shale gas development in Jiaoshiba Block[J].Oil Drilling & Production Technology,2016,38(5):545-552.[doi:10.13639/j.odpt.2016.05.001]
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焦石壩頁巖氣儲層水平井井壁失穩機理
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《石油鉆采工藝》[ISSN:1000-7393/CN:13-1072/TE]

卷:
38卷
期數:
2016年5期
頁碼:
545-552
欄目:
鉆井完井
出版日期:
2016-09-20

文章信息/Info

Title:
Mechanisms of sidewall stability loss in horizontal wells drilled for shale gas development in Jiaoshiba Block
文章編號:
1000 – 7393( 2016 ) 05– 0545– 08
作者:
崔云海1  劉厚彬2  楊海平1  馬天壽2
1. 中石化江漢石油工程有限公司; 2. 西南石油大學油氣藏地質及開發工程國家重點實驗室
Author(s):
CUI Yunhai1 LIU Houbin2 YANG Haiping1 MA Tianshou2
1. SINOPEC Jianghan Petroleum Engineering Co. Ltd., Qianjiang, Hubei 433124, China; 2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China
關鍵詞:
頁巖氣井壁穩定坍塌壓力各向異性層理面焦石壩區塊
Keywords:
shale gas sidewall stability collapsing pressure anisotropy bedding plane Jiaoshiba Block
分類號:
TE21
DOI:
10.13639/j.odpt.2016.05.001
文獻標志碼:
A
摘要:
焦石壩區塊頁巖氣儲層巖石層理發育,導致頁巖強度各向異性特征明顯,鉆井過程中易發生井壁失穩問題。為此, 采用龍馬溪組井下巖心開展直接剪切和三軸實驗,結合單組弱面強度理論,建立了頁巖強度各向異性表征方法;綜合頁巖強度各向異性表征方法、井壁應力分布模型,建立了頁巖井壁坍塌壓力計算方法;最后,以目標井JY1HF 井為例進行了實例計算與分析。結果表明:龍馬溪組頁巖發育了大量軟弱層理,沿軟弱層理剪切滑移是井壁失穩的主要力學機制;鉆井液浸泡后頁巖強度出現劣化,但強度劣化效應并不十分顯著;常規模型計算的坍塌壓力隨著井斜角增加而減小,文中模型計算的坍塌壓力隨著井斜角先增加后減小,且計算結果與實際情況更加吻合;頁巖薄弱層理的剪切滑移是井斜井段井壁垮塌的關鍵,而強度的劣化并不是主控因素。研究結果可為礁石壩區塊和其他地區頁巖氣井鉆井設計、軌跡優化等提供參考。
Abstract:
With beddings well developed, shale gas reservoirs in Jiaoshiba Block are characterized by high strength anisotrophy, so loss of sidewall stability is frequent in these reservoirs. Therefore, direct shearing and triaxial tests were performed on core samples taken from the Longmaxi Formation to develop a new way to characterize shale strength anisotropy based on single-group weak-plane strength theory. By combining the shale strength anisotropy characterization method and model of stress distribution on sidewall, a calculation method of sidewall collapsing pressure in shale formations has been worked out. Finally, calculation and analysis have been done with Well JY1HF as an example. The calculation results show that, with large amounts of weak bedding, shale in the Longmaxi Formation shows apparent anisotropy, and shearing slippage along weak bedding is the main mechanism of sidewall stability loss. Strength of the shale soaked in drilling fluid turns weaker, but such strength reduction is not significant; collapsing pressure calcualted by using conventional models decreases with the increase of deviation angle, whereas collapsing pressure calculated by using the model proposed in this paper increases first and decreases later with the increase of deviation angle, and the calculation results match well with field observation results; shearing slippage of weak bedding in shale is the key of sidewall collapsing in building-up intervals, while reduction in rock strength is not the controlling factor. The research results may provide references and guidelines for drilling design, trajectory optimization of shale gas wells in Jiaoshiba Block and other regions.

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