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A New Compound Staged Gelling Acid Fracturing Method for Ultra-Deep Horizontal Wells
Carbonate gas reservoirs in Sichuan are deeply buried, high temperature and strong heterogeneity. Staged acid fracturing is an effective means to improve production. Staged acidizing fracturing of ultra-deep horizontal wells faces the following problems: 1. Strong reservoir heterogeneity leads to th...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9319027/ https://www.ncbi.nlm.nih.gov/pubmed/35877534 http://dx.doi.org/10.3390/gels8070449 |
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author | Wang, Yang Fan, Yu Wang, Tianyu Ye, Jiexiao Luo, Zhifeng |
author_facet | Wang, Yang Fan, Yu Wang, Tianyu Ye, Jiexiao Luo, Zhifeng |
author_sort | Wang, Yang |
collection | PubMed |
description | Carbonate gas reservoirs in Sichuan are deeply buried, high temperature and strong heterogeneity. Staged acid fracturing is an effective means to improve production. Staged acidizing fracturing of ultra-deep horizontal wells faces the following problems: 1. Strong reservoir heterogeneity leads to the difficulty of fine segmentation; 2. The horizontal well section is long and running too many packers increases the completion risk; 3. Under high temperatures, the reaction speed between acid and rock is rapid and the acid action distance is short; and 4. The fracture conductivity is low under high-closure stress. In view of the above problems, the optimal fracture spacing is determined through productivity simulation. The composite temporary plugging of fibers and particles can increase the plugging layer pressure to 17.9 MPa, which can meet the requirements of the staged acid fracturing of horizontal wells. Through the gelling acid finger characteristic simulation and conductivity test, it is clear that the crosslinked authigenic acid and gelling acid in the Sichuan carbonate gas reservoir are injected alternately in three stages. When the proportion of gelling acid injected into a single section is 75% and the acid strength is 1.6 m(3)/m, the length and conductivity of acid corrosion fracture are the best. A total of 12 staged acid fracturing horizontal wells have been completed in the Sichuan carbonate gas reservoir, and the production is 2.1 times that of ordinary acid fracturing horizontal wells. |
format | Online Article Text |
id | pubmed-9319027 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-93190272022-07-27 A New Compound Staged Gelling Acid Fracturing Method for Ultra-Deep Horizontal Wells Wang, Yang Fan, Yu Wang, Tianyu Ye, Jiexiao Luo, Zhifeng Gels Article Carbonate gas reservoirs in Sichuan are deeply buried, high temperature and strong heterogeneity. Staged acid fracturing is an effective means to improve production. Staged acidizing fracturing of ultra-deep horizontal wells faces the following problems: 1. Strong reservoir heterogeneity leads to the difficulty of fine segmentation; 2. The horizontal well section is long and running too many packers increases the completion risk; 3. Under high temperatures, the reaction speed between acid and rock is rapid and the acid action distance is short; and 4. The fracture conductivity is low under high-closure stress. In view of the above problems, the optimal fracture spacing is determined through productivity simulation. The composite temporary plugging of fibers and particles can increase the plugging layer pressure to 17.9 MPa, which can meet the requirements of the staged acid fracturing of horizontal wells. Through the gelling acid finger characteristic simulation and conductivity test, it is clear that the crosslinked authigenic acid and gelling acid in the Sichuan carbonate gas reservoir are injected alternately in three stages. When the proportion of gelling acid injected into a single section is 75% and the acid strength is 1.6 m(3)/m, the length and conductivity of acid corrosion fracture are the best. A total of 12 staged acid fracturing horizontal wells have been completed in the Sichuan carbonate gas reservoir, and the production is 2.1 times that of ordinary acid fracturing horizontal wells. MDPI 2022-07-18 /pmc/articles/PMC9319027/ /pubmed/35877534 http://dx.doi.org/10.3390/gels8070449 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Wang, Yang Fan, Yu Wang, Tianyu Ye, Jiexiao Luo, Zhifeng A New Compound Staged Gelling Acid Fracturing Method for Ultra-Deep Horizontal Wells |
title | A New Compound Staged Gelling Acid Fracturing Method for Ultra-Deep Horizontal Wells |
title_full | A New Compound Staged Gelling Acid Fracturing Method for Ultra-Deep Horizontal Wells |
title_fullStr | A New Compound Staged Gelling Acid Fracturing Method for Ultra-Deep Horizontal Wells |
title_full_unstemmed | A New Compound Staged Gelling Acid Fracturing Method for Ultra-Deep Horizontal Wells |
title_short | A New Compound Staged Gelling Acid Fracturing Method for Ultra-Deep Horizontal Wells |
title_sort | new compound staged gelling acid fracturing method for ultra-deep horizontal wells |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9319027/ https://www.ncbi.nlm.nih.gov/pubmed/35877534 http://dx.doi.org/10.3390/gels8070449 |
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