Mudcake effects on wellbore stress and fracture initiation pressure and implications for wellbore strengthening
Abstract Although a large volume of mudcake filtration test data is available in the literature, effects of mudcake on wellbore strengthening cannot be quantified without incorporating the data into a stress-analysis model. Traditional models for determining fracture initiation pressure (FIP) either...
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2018-03-01
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| Series: | Petroleum Science |
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| Online Access: | http://link.springer.com/article/10.1007/s12182-018-0218-1 |
| _version_ | 1818916710832406528 |
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| author | Yongcun Feng Xiaorong Li K. E. Gray |
| author_facet | Yongcun Feng Xiaorong Li K. E. Gray |
| author_sort | Yongcun Feng |
| collection | DOAJ |
| description | Abstract Although a large volume of mudcake filtration test data is available in the literature, effects of mudcake on wellbore strengthening cannot be quantified without incorporating the data into a stress-analysis model. Traditional models for determining fracture initiation pressure (FIP) either consider a wellbore with an impermeable mudcake or with no mudcake at all. An analytical model considering permeable mudcake is proposed in this paper. The model can predict pore pressure and stress profiles around the wellbore, and consequently the FIP, for different mudcake thickness, permeability, and strength. Numerical examples are provided to illustrate the effects of these mudcake parameters. The results show that a low-permeability mudcake enhances FIP, mainly through restricting fluid seepage and pore pressure increase in the near-wellbore region, rather than by mudcake strength. Fluid loss pressure (FLP) should be distinguished from FIP when a mudcake is present on the wellbore wall. Fracture may occur behind the mudcake at FIP without mudcake rupture. The small effect of mudcake strength on FIP does not mean its effect on FLP is small too. Mudcake strength may play an important role in maintaining integrity of the wellbore once a fracture has initiated behind the mudcake. |
| first_indexed | 2024-12-20T00:22:30Z |
| format | Article |
| id | doaj.art-a5eebadcb71e4f23a9a7a2740780e851 |
| institution | Directory Open Access Journal |
| issn | 1672-5107 1995-8226 |
| language | English |
| last_indexed | 2024-12-20T00:22:30Z |
| publishDate | 2018-03-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Petroleum Science |
| spelling | doaj.art-a5eebadcb71e4f23a9a7a2740780e8512022-12-21T20:00:10ZengKeAi Communications Co., Ltd.Petroleum Science1672-51071995-82262018-03-0115231933410.1007/s12182-018-0218-1Mudcake effects on wellbore stress and fracture initiation pressure and implications for wellbore strengtheningYongcun Feng0Xiaorong Li1K. E. Gray2The University of Texas at AustinThe University of Texas at AustinThe University of Texas at AustinAbstract Although a large volume of mudcake filtration test data is available in the literature, effects of mudcake on wellbore strengthening cannot be quantified without incorporating the data into a stress-analysis model. Traditional models for determining fracture initiation pressure (FIP) either consider a wellbore with an impermeable mudcake or with no mudcake at all. An analytical model considering permeable mudcake is proposed in this paper. The model can predict pore pressure and stress profiles around the wellbore, and consequently the FIP, for different mudcake thickness, permeability, and strength. Numerical examples are provided to illustrate the effects of these mudcake parameters. The results show that a low-permeability mudcake enhances FIP, mainly through restricting fluid seepage and pore pressure increase in the near-wellbore region, rather than by mudcake strength. Fluid loss pressure (FLP) should be distinguished from FIP when a mudcake is present on the wellbore wall. Fracture may occur behind the mudcake at FIP without mudcake rupture. The small effect of mudcake strength on FIP does not mean its effect on FLP is small too. Mudcake strength may play an important role in maintaining integrity of the wellbore once a fracture has initiated behind the mudcake.http://link.springer.com/article/10.1007/s12182-018-0218-1MudcakeHoop stressFracture initiation pressureFluid loss pressureWellbore strengthening |
| spellingShingle | Yongcun Feng Xiaorong Li K. E. Gray Mudcake effects on wellbore stress and fracture initiation pressure and implications for wellbore strengthening Petroleum Science Mudcake Hoop stress Fracture initiation pressure Fluid loss pressure Wellbore strengthening |
| title | Mudcake effects on wellbore stress and fracture initiation pressure and implications for wellbore strengthening |
| title_full | Mudcake effects on wellbore stress and fracture initiation pressure and implications for wellbore strengthening |
| title_fullStr | Mudcake effects on wellbore stress and fracture initiation pressure and implications for wellbore strengthening |
| title_full_unstemmed | Mudcake effects on wellbore stress and fracture initiation pressure and implications for wellbore strengthening |
| title_short | Mudcake effects on wellbore stress and fracture initiation pressure and implications for wellbore strengthening |
| title_sort | mudcake effects on wellbore stress and fracture initiation pressure and implications for wellbore strengthening |
| topic | Mudcake Hoop stress Fracture initiation pressure Fluid loss pressure Wellbore strengthening |
| url | http://link.springer.com/article/10.1007/s12182-018-0218-1 |
| work_keys_str_mv | AT yongcunfeng mudcakeeffectsonwellborestressandfractureinitiationpressureandimplicationsforwellborestrengthening AT xiaorongli mudcakeeffectsonwellborestressandfractureinitiationpressureandimplicationsforwellborestrengthening AT kegray mudcakeeffectsonwellborestressandfractureinitiationpressureandimplicationsforwellborestrengthening |