[1]李軍,丁士東,韓禮紅,等.頁巖氣多級壓裂井筒完整性失效機理及控制方法研究進展[J].石油管材與儀器,2020,6(04):10-15.[doi:10.19459/j.cnki.61-1500/te.2020.04.002]
 LI Jun,DING Shidong,HAN Lihong,et al.Research Progress on Failure Mechanism and Control Methods of Wellbore Integrity During Multistage Fracturing of Shale Gas[J].Petroleum Tubular Goods & Instruments,2020,6(04):10-15.[doi:10.19459/j.cnki.61-1500/te.2020.04.002]
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頁巖氣多級壓裂井筒完整性失效機理及控制方法研究進展
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《石油管材與儀器》[ISSN:2096-0077/CN:61-1500/TE]

卷:
6
期數:
2020年04期
頁碼:
10-15
欄目:
頁巖氣專題
出版日期:
2020-08-20

文章信息/Info

Title:
Research Progress on Failure Mechanism and Control Methods of Wellbore Integrity During Multistage Fracturing of Shale Gas
文章編號:
2096-0077(2020)04--0010-06
作者:
李軍1丁士東2韓禮紅3陶謙2
1.中國石油大學(北京)克拉瑪依校區 新疆 克拉瑪依 834000;2.中國石化石油工程技術研究院 北京 100101;3.中國石油集團石油管工程技術研究院,石油管材及裝備材料服役行為與結構安全國家重點實驗室 陜西 西安 710077
Author(s):
LI Jun1 DING Shidong2 HAN Lihong3TAO Qian2
1.China University of PetroleumBeijing at Karamay, Karamay, Xinjiang 834000, China;2.Sinopec Research Institute of Petroleum Engineering, Beijing 100101,China;3.State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials, CNPC Tubular Goods Research Institute, Xi′an, Shaanxi 710077, China
關鍵詞:
頁巖氣井筒完整性套管變形環空帶壓控制方法
Keywords:
shale gas wellbore integrity casing deformation sustained casing pressure control method
分類號:
TE931.2
DOI:
10.19459/j.cnki.61-1500/te.2020.04.002
文獻標志碼:
A
摘要:
綜述了國內外頁巖氣多級分段壓裂過程中井筒完整性失效的概況?傮w來看,我國的頁巖氣井筒完整性失效問題明顯比國外嚴重,嚴重制約了我國頁巖氣的高效開發。進一步明確了失效形式分為兩大類,一是結構完整性失效,即套管產生變形;二是密封完整性失效,即出現環空帶壓現象。分析了頁巖氣井筒完整性失效機理,包括壓裂前的井筒組合體原始應力狀態、壓裂過程中套管載荷的動態變化等多個階段。分析表明,復雜的地應力條件、地層各向異性、長水平段非均質性、巖性界面、斷層和裂縫發育、井眼軌跡質量差、下套管困難等對壓裂前套管的原始應力有明顯影響。而在壓裂過程中,套管承受拉壓交變載荷、近井地應力場及地層性質動態變化、裂縫非均勻擴展、微斷層滑移、套管溫度的急劇變化、水泥環出現微環隙或微裂隙等是導致井筒完整性失效的原因。對中國頁巖氣套管變形問題而言,以地層滑移的影響最為顯著。最后提出了井筒完整性控制方法,包括:井眼軌道優化與軌跡控制、套管鋼級與壁厚優選、固井方式優化、水泥漿體系優化、分段分簇及壓裂參數優化、采用可溶橋塞、井身結構優化、裸眼分段壓裂等,可為我國頁巖氣井筒完整性失效問題的治理提供參考。
Abstract:
An overview of wellbore integrity failure during the multistage fracturing process of shale gas at home and abroad is summarized in this paper. Overall, the problem of shale gas wellbore integrity failure in China is obviously more serious than that abroad, which seriously restricts the high efficiency of shale gas development. It is further clarified that the failure modes are divided into two categories. One is structural integrity failure, that is, the casing deformation. The other is seal integrity failure, that is, the sustained casing pressure. The failure mechanism of shale gas wellbore integrity was analyzed, including the initial stress state of the wellbore assembly before fracturing and the dynamic changes of casing load during fracturing. The analysis result shows that complex insitu stress conditions, formation anisotropy, long horizontal section heterogeneity, lithologic interface, fault and fracture development, poor borehole trajectory quality and the difficulty of running casing have a significant effect on the original stress of casing before fracturing. During the fracturing process, the casing is subjected to tensile and compression alternating loads, nearwell insitu stress field and dynamic changes of formation properties, nonuniform propagation of cracks, microfault slips, sharp changes in casing temperature, and micro annulus in the cement ring or microfractures, which are the causes of the failure of the wellbore integrity. For the shale gas casing deformation problem in China, the effect of formation slip is the most significant. Finally, the wellbore integrity control methods are proposed including wellbore trajectory optimization and trajectory control, casing steel grade and wall thickness optimization, cementing method optimization, cement slurry system optimization, segment clustering and fracturing parameter optimization, soluble bridge plugs aplication, wellbore structure optimization, openhole staged fracturing, etc., which can provide a reference for the treatment of shale gas wellbore integrity failure in our country.

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備注/Memo

備注/Memo:
基金項目:國家自然科學基金-石油化工聯合基金重點支持項目“頁巖氣水平井井筒完整性失效機理與控制方法研究”(項目編號:U1762211);企業創新發展聯合基金-集成項目“海相深層油氣富集機理與關鍵工程技術基礎研究-構造應力集中區頁巖氣井套管載荷模型及結構完整性失效機理”(項目編號:U19B6003-05-04-02) 第一作者簡介:李軍,男,1971年生,教授,博士生導師,2005年畢業于中國石油大學(北京)油氣井工程專業,獲博士學位,現從事油氣井力學與控制工程研究。E-mail:[email protected]
更新日期/Last Update: 2020-08-25
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