A systematic investigation of drilling fluid bulk relaxation impact on NMR interpretation for formation evaluation
During drilling, mud filtrate invasion alters near-wellbore properties which possibly impacts well logging measurements causing inaccuracies in formation evaluation. Given the shallow detection depth of nuclear magnetic resonance (NMR) logging, the transverse relaxation time (T2) spectrum is highly...
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KeAi Communications Co., Ltd.
2025-06-01
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| Series: | Petroleum |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2405656125000331 |
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| author | Fauzan Akomolafe Ammar El-Husseiny Abdulrauf Adebayo Mohamed Mahmoud Badr Bageri |
| author_facet | Fauzan Akomolafe Ammar El-Husseiny Abdulrauf Adebayo Mohamed Mahmoud Badr Bageri |
| author_sort | Fauzan Akomolafe |
| collection | DOAJ |
| description | During drilling, mud filtrate invasion alters near-wellbore properties which possibly impacts well logging measurements causing inaccuracies in formation evaluation. Given the shallow detection depth of nuclear magnetic resonance (NMR) logging, the transverse relaxation time (T2) spectrum is highly susceptible to invasion effects. However, the impact of drilling fluid bulk relaxation on NMR T2 and formation damage remains underexplored. This study aims to investigate how drilling fluid bulk relaxation influences NMR T2 relaxometry responses in the near-wellbore region. Two factors controlling the drilling fluid bulk relaxation were considered and systematically varied: (1) XC polymer concentrations and (2) perlite concentrations in the drilling fluid. We conducted NMR measurements before and after filtration experiments on both permeable and tight limestone samples to assess the influence of host rock properties on the results. The study shows that drilling fluid bulk relaxation significantly impacts T2 values. Additives like XC polymer or barite lower T2 bulk values, reducing the T2 logarithmic mean by up to 90% especially in invaded macropores. The more notable impact in macropores is because they are more influenced by bulk relaxation mechanism compared to micropores. Rocks with larger pores experience greater reduction in T2, while tight rocks, dominated by surface relaxation, show mineral changes. The findings underscore the importance of accounting for drilling fluid bulk relaxation in NMR interpretation to avoid overestimating formation damage and permeability reduction. |
| format | Article |
| id | doaj-art-2d45d3d81f3449e581a67d2cb4768841 |
| institution | Kabale University |
| issn | 2405-6561 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | KeAi Communications Co., Ltd. |
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| series | Petroleum |
| spelling | doaj-art-2d45d3d81f3449e581a67d2cb47688412025-08-20T03:26:57ZengKeAi Communications Co., Ltd.Petroleum2405-65612025-06-0111330831910.1016/j.petlm.2025.05.001A systematic investigation of drilling fluid bulk relaxation impact on NMR interpretation for formation evaluationFauzan Akomolafe0Ammar El-Husseiny1Abdulrauf Adebayo2Mohamed Mahmoud3Badr Bageri4College of Petroleum Engineering and Geosciences, King Fahd University of Petroleum & Minerals, Dhahran, 31261, Saudi ArabiaCorresponding author.; College of Petroleum Engineering and Geosciences, King Fahd University of Petroleum & Minerals, Dhahran, 31261, Saudi ArabiaCollege of Petroleum Engineering and Geosciences, King Fahd University of Petroleum & Minerals, Dhahran, 31261, Saudi ArabiaCollege of Petroleum Engineering and Geosciences, King Fahd University of Petroleum & Minerals, Dhahran, 31261, Saudi ArabiaCollege of Petroleum Engineering and Geosciences, King Fahd University of Petroleum & Minerals, Dhahran, 31261, Saudi ArabiaDuring drilling, mud filtrate invasion alters near-wellbore properties which possibly impacts well logging measurements causing inaccuracies in formation evaluation. Given the shallow detection depth of nuclear magnetic resonance (NMR) logging, the transverse relaxation time (T2) spectrum is highly susceptible to invasion effects. However, the impact of drilling fluid bulk relaxation on NMR T2 and formation damage remains underexplored. This study aims to investigate how drilling fluid bulk relaxation influences NMR T2 relaxometry responses in the near-wellbore region. Two factors controlling the drilling fluid bulk relaxation were considered and systematically varied: (1) XC polymer concentrations and (2) perlite concentrations in the drilling fluid. We conducted NMR measurements before and after filtration experiments on both permeable and tight limestone samples to assess the influence of host rock properties on the results. The study shows that drilling fluid bulk relaxation significantly impacts T2 values. Additives like XC polymer or barite lower T2 bulk values, reducing the T2 logarithmic mean by up to 90% especially in invaded macropores. The more notable impact in macropores is because they are more influenced by bulk relaxation mechanism compared to micropores. Rocks with larger pores experience greater reduction in T2, while tight rocks, dominated by surface relaxation, show mineral changes. The findings underscore the importance of accounting for drilling fluid bulk relaxation in NMR interpretation to avoid overestimating formation damage and permeability reduction.http://www.sciencedirect.com/science/article/pii/S2405656125000331NMRDrilling fluidBulk relaxationParticle invasionFormation evaluation |
| spellingShingle | Fauzan Akomolafe Ammar El-Husseiny Abdulrauf Adebayo Mohamed Mahmoud Badr Bageri A systematic investigation of drilling fluid bulk relaxation impact on NMR interpretation for formation evaluation Petroleum NMR Drilling fluid Bulk relaxation Particle invasion Formation evaluation |
| title | A systematic investigation of drilling fluid bulk relaxation impact on NMR interpretation for formation evaluation |
| title_full | A systematic investigation of drilling fluid bulk relaxation impact on NMR interpretation for formation evaluation |
| title_fullStr | A systematic investigation of drilling fluid bulk relaxation impact on NMR interpretation for formation evaluation |
| title_full_unstemmed | A systematic investigation of drilling fluid bulk relaxation impact on NMR interpretation for formation evaluation |
| title_short | A systematic investigation of drilling fluid bulk relaxation impact on NMR interpretation for formation evaluation |
| title_sort | systematic investigation of drilling fluid bulk relaxation impact on nmr interpretation for formation evaluation |
| topic | NMR Drilling fluid Bulk relaxation Particle invasion Formation evaluation |
| url | http://www.sciencedirect.com/science/article/pii/S2405656125000331 |
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