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A Polymer Plugging Gel for the Fractured Strata and Its Application

Well leakage of fractured strata is a tricky problem while drilling. This unwieldy problem is usually caused by the poor formation of the cementing degree, the staggered-mesh of the fracture, and the low bearing capacity of the formation, which can also lead to a narrow and even unsafe window of dri...

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Autores principales: Fan, Xiangyu, Zhao, Pengfei, Zhang, Qiangui, Zhang, Ting, Zhu, Kui, Zhou, Chenghua
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5978233/
https://www.ncbi.nlm.nih.gov/pubmed/29883407
http://dx.doi.org/10.3390/ma11050856
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author Fan, Xiangyu
Zhao, Pengfei
Zhang, Qiangui
Zhang, Ting
Zhu, Kui
Zhou, Chenghua
author_facet Fan, Xiangyu
Zhao, Pengfei
Zhang, Qiangui
Zhang, Ting
Zhu, Kui
Zhou, Chenghua
author_sort Fan, Xiangyu
collection PubMed
description Well leakage of fractured strata is a tricky problem while drilling. This unwieldy problem is usually caused by the poor formation of the cementing degree, the staggered-mesh of the fracture, and the low bearing capacity of the formation, which can also lead to a narrow and even unsafe window of drilling fluid density. For fractured strata, the normal plugging material has the disadvantages of unsuitable size and low strength, resulting in unsuccessful first time plugging and an increase in cost. Therefore, we developed a polymer plugging gel for the fractured strata, named XNGJ-3. XNGJ-3 is mainly made of an acrylamide monomer and is accompanied by the reactive monomers of carboxyl and hydroxyl as ingredients. XNGJ-3 has a low viscosity before gelling. At 80 °C it becomes gelled, and the gelling time was controlled within the required time of the practical application. These conditions are beneficial for making the plugging material enter the crossing fracture smoothly and occlude the fracture. XNGJ-3 also has a good deformability and can avoid being damaged during the process of fracture closure. The well leakage simulated experiment revealed that the bearing capacity of this material can reach 21 MPa and the inverse bearing capacity can reach 20 MPa. These strengths are more than twice that of common polymer plugging gels. Finally, three leaked wells in the fractured strata of the Sichuan Basin were used to verify the plugging effect of XNGJ-3. Compared with other common plugging materials, XNGJ-3 has the advantages of having a higher success rate of first time plugging, a lower economic cost, a shorter work time, and so forth, which indicate that this plugging material has a good engineering application value in dealing with well leakage of fractured strata.
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spelling pubmed-59782332018-05-31 A Polymer Plugging Gel for the Fractured Strata and Its Application Fan, Xiangyu Zhao, Pengfei Zhang, Qiangui Zhang, Ting Zhu, Kui Zhou, Chenghua Materials (Basel) Article Well leakage of fractured strata is a tricky problem while drilling. This unwieldy problem is usually caused by the poor formation of the cementing degree, the staggered-mesh of the fracture, and the low bearing capacity of the formation, which can also lead to a narrow and even unsafe window of drilling fluid density. For fractured strata, the normal plugging material has the disadvantages of unsuitable size and low strength, resulting in unsuccessful first time plugging and an increase in cost. Therefore, we developed a polymer plugging gel for the fractured strata, named XNGJ-3. XNGJ-3 is mainly made of an acrylamide monomer and is accompanied by the reactive monomers of carboxyl and hydroxyl as ingredients. XNGJ-3 has a low viscosity before gelling. At 80 °C it becomes gelled, and the gelling time was controlled within the required time of the practical application. These conditions are beneficial for making the plugging material enter the crossing fracture smoothly and occlude the fracture. XNGJ-3 also has a good deformability and can avoid being damaged during the process of fracture closure. The well leakage simulated experiment revealed that the bearing capacity of this material can reach 21 MPa and the inverse bearing capacity can reach 20 MPa. These strengths are more than twice that of common polymer plugging gels. Finally, three leaked wells in the fractured strata of the Sichuan Basin were used to verify the plugging effect of XNGJ-3. Compared with other common plugging materials, XNGJ-3 has the advantages of having a higher success rate of first time plugging, a lower economic cost, a shorter work time, and so forth, which indicate that this plugging material has a good engineering application value in dealing with well leakage of fractured strata. MDPI 2018-05-21 /pmc/articles/PMC5978233/ /pubmed/29883407 http://dx.doi.org/10.3390/ma11050856 Text en © 2018 by the authors. 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 (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Fan, Xiangyu
Zhao, Pengfei
Zhang, Qiangui
Zhang, Ting
Zhu, Kui
Zhou, Chenghua
A Polymer Plugging Gel for the Fractured Strata and Its Application
title A Polymer Plugging Gel for the Fractured Strata and Its Application
title_full A Polymer Plugging Gel for the Fractured Strata and Its Application
title_fullStr A Polymer Plugging Gel for the Fractured Strata and Its Application
title_full_unstemmed A Polymer Plugging Gel for the Fractured Strata and Its Application
title_short A Polymer Plugging Gel for the Fractured Strata and Its Application
title_sort polymer plugging gel for the fractured strata and its application
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5978233/
https://www.ncbi.nlm.nih.gov/pubmed/29883407
http://dx.doi.org/10.3390/ma11050856
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