[1]席巖  李軍  柳貢慧  查春青  嚴攀.瞬態力-熱耦合作用下水泥環完整性分析[J].石油鉆采工藝,2017,39(4):417-423.[doi:10.13639/j.odpt.2017.04.005]
 XI Yan,LI Jun,LIU Gonghui,et al.Analysis on cement sheath integrity under transient thermo-mechanical coupling effect[J].Oil Drilling & Production Technology,2017,39(4):417-423.[doi:10.13639/j.odpt.2017.04.005]
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瞬態力-熱耦合作用下水泥環完整性分析
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《石油鉆采工藝》[ISSN:1000-7393/CN:13-1072/TE]

卷:
39卷
期數:
2017年4期
頁碼:
417-423
欄目:
鉆井完井
出版日期:
2017-07-20

文章信息/Info

Title:
Analysis on cement sheath integrity under transient thermo-mechanical coupling effect
文章編號:
1000 – 7393( 2017 ) 04 – 0417– 07
作者:
席巖1  李軍1  柳貢慧12  查春青1  嚴攀1
1. 中國石油大學(北京);2. 北京工業大學
Author(s):
XI Yan1 LI Jun1 LIU Gonghui12 ZHA Chunqing1 YAN Pan1
1. China University of Petroleum, Beijing 102249, China; 2. Beijing University of Technology, Beijing 100124, China
關鍵詞:
頁巖氣壓裂環空帶壓 水泥環 瞬態力-熱耦合完整性
Keywords:
shale gas fracturingsustained annular pressure cement sheath transient thermo-mechanical coupling effect integrity
分類號:
TE329
DOI:
10.13639/j.odpt.2017.04.005
文獻標志碼:
A
摘要:
頁巖氣井工程實踐表明,套管壓裂易導致水泥環完整性發生破壞出現環空帶壓。基于套管壓裂工程實際,建立井筒溫度場模型和套管-水泥環-地層組合體有限元模型,采用解析法和數值法結合方式,計算頁巖氣井壓裂過程中瞬態力-熱耦合對水泥環應力大小、分布影響規律。結果表明:壓裂過程中水泥環內外壁溫差先增大后減小,壓裂初近內壁處存在陡峭溫度梯度,易導致內壁應力顯著提高;瞬態力-熱耦合作用導致水泥環內壁應力大幅提升,加劇了水泥環完整性失效的風險,壓裂初期為水泥環易發生損壞的“風險段”;水泥環內壁最大應力隨著時間變化,易產生“多裂紋”形態,加劇環空帶壓。研究結果可為頁巖氣井壓裂過程中水泥環完整性設計控制提供參考。
Abstract:
The practical shale gas well engineering shows that casing fracturing can easily destroy the integrity of cement sheath, leading to sustained annular pressure (SAP). In this paper, the wellbore temperature field calculation model and the finite element model of casing-cement sheath-formation assembly were established based on the actual casing fracturing engineering. The effect laws of transient thermo-mechanical coupling on the magnitude and distribution of cement sheath stress were calculated by using analytical method and numerical method comprehensively. It is shown that the temperature difference between inside and outside the wall of cement sheath increases firstly and then decreases in the process of fracturing. Steep temperature gradient occurs near the inside wall at the initial fracturing and it tends to result in obvious increase of stress on the inside wall. Due to the effect of transient thermo-mechanical coupling, the stress on the inside wall of cement sheath is increased significantly, and the risk of cement sheath integrity failure is aggravated. The initial fracturing stage is the “risk period” when cement sheath failure tends to happen easily. As time goes, the maximum stress on the inside wall of cement sheath results in multiple cracks easily and makes the SAP more serious. The research results can provide the reference for the design and control of cement sheath integrity during the fracturing of shale gas well.

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