A comprehensive modeling analysis of borehole stability and production liner deformation for inclined/horizontal wells completed in a highly compacting chalk formation

K. Furui, G. F. Fuh, N. Abdelmalek, N. Morita

研究成果: Conference contribution

2 引用 (Scopus)

抜粋

Numerous casing and production liner deformation/failure problems have been reported in high porosity chalk formations in both the overburden and the reservoir sections, causing costly operation problems that prevent workovers and recompletions. This paper presents the results of studies performed to investigate stability of an openhole, cemented liner, and uncemented liner completions in a highly compacting chalk formation. The effects of critical cavity dimensions caused by various acid stimulation techniques were also investigated. Based on the review of historical caliper survey data, we ascertain that the axial compression collapse is a major liner deformation mechanism in the reservoir zones. Axial compression collapse has been found in both low-angle wells (also buildup sections of horizontal wells) and horizontal laterals. The casing deformation in low-angle sections are due to reservoir compaction (i.e., change in the vertical formation strain) while the deformation in horizontal sections are primarily induced by increased axial loading due to cavity deformation. The current completion practice using cluster perforations and high volume acid treatments causes vertically enlarged cavities resulting in poor radial constraint. A series of laboratory triaxial tests were performed on selected reservoir chalk samples to measure the stress-strain and failure behavior of the chalk formation considering a wide range of porosity, water saturation, and different levels of confining pressures. Using the chalk failure criteria and constitutive relations developed from the analysis of laboratory triaxial compression test data, a 3D non-linear poroelastic-plastic finite element model was developed for the openhole stability analysis. The simulation results show that the abnormally high ductility of chalks after pore collapse around a borehole could actually enhance borehole stability with the magnitude beyond expectation. In this study, the analytical and numerical models are also developed for evaluating cavity-induced axial compression collapse of production liners. Model results indicate that the risk of the cavity-induced axial compression collapse substantially increases for short perforated intervals stimulated with large acid treatments. However, increasing the perforation interval lengths along the entire liner axis results in more uniform acid distribution and will greatly reduce the chance of axial compression collapse caused by localized cavity deformation. Based on these analysis results, key completion design criteria and stimulation strategies were developed for wells completed in highly compacting chalk reservoirs to reduce risk of casing and liner mechanical problems.

元の言語English
ホスト出版物のタイトルSociety of Petroleum Engineers - SPE Annual Technical Conference and Exhibition 2009, ATCE 2009
ページ272-290
ページ数19
出版物ステータスPublished - 2009 12 1
外部発表Yes
イベントSPE Annual Technical Conference and Exhibition 2009, ATCE 2009 - New Orleans, LA, United States
継続期間: 2009 10 42009 10 7

出版物シリーズ

名前Proceedings - SPE Annual Technical Conference and Exhibition
1

Conference

ConferenceSPE Annual Technical Conference and Exhibition 2009, ATCE 2009
United States
New Orleans, LA
期間09/10/409/10/7

ASJC Scopus subject areas

  • Fuel Technology
  • Energy Engineering and Power Technology

フィンガープリント A comprehensive modeling analysis of borehole stability and production liner deformation for inclined/horizontal wells completed in a highly compacting chalk formation' の研究トピックを掘り下げます。これらはともに一意のフィンガープリントを構成します。

  • これを引用

    Furui, K., Fuh, G. F., Abdelmalek, N., & Morita, N. (2009). A comprehensive modeling analysis of borehole stability and production liner deformation for inclined/horizontal wells completed in a highly compacting chalk formation. : Society of Petroleum Engineers - SPE Annual Technical Conference and Exhibition 2009, ATCE 2009 (pp. 272-290). (Proceedings - SPE Annual Technical Conference and Exhibition; 巻数 1).