Experimental comparisons of different cryogenic fracturing methods on coals

2区工程技术 Q1 Earth and Planetary Sciences

Journal of Petroleum Science and Engineering Pub Date : 2023-01-01 DOI:10.1016/j.petrol.2022.111250

Haitao Wen, Ruiyue Yang, Meiquan Lu, Zhongwei Huang, Chunyang Hong, Richao Cong, Xiaozhou Qin

{"title":"Experimental comparisons of different cryogenic fracturing methods on coals","authors":"Haitao Wen, Ruiyue Yang, Meiquan Lu, Zhongwei Huang, Chunyang Hong, Richao Cong, Xiaozhou Qin","doi":"10.1016/j.petrol.2022.111250","DOIUrl":null,"url":null,"abstract":"<div>Hydraulic fracturing using water-based fracturing fluids is widely used in coalbed methane (CBM) reservoir development. However, the stimulation efficiency of conventional hydraulic fracturing in CBM reservoir is low. Liquid nitrogen (LN2) cryogenic fracturing is one possible method to improve the stimulation efficiency. To test the feasibility of the LN2 cryogenic fracturing, laboratory fracturing tests were conducted to investigate the performances of different LN2 cryogenic fracturing methods in this paper. The breakdown pressure and fracture morphology of water fracturing, LN2 direct fracturing, LN2 freeze fracturing, LN2 freeze-thaw fracturing and LN2 compound fracturing were compared. And the mechanisms of different cryogenic fracturing techniques are revealed. The results demonstrate that thermal damage caused by LN2 freezing is the main reason for the complicated fracture pattern in cryogenic fracturing. LN2 freeze-thaw fracturing has the lowest breakdown pressure and can create the most complex fractures among these cryogenic fracturing methods due to the huge thermal damage. LN2 freeze fracturing has the highest breakdown pressure. Because the thermal damage cracks and natural fractures in frozen rock are in freezing shrinkage, which activation are difficult. LN2 compound fracturing is the most potential technologies, which can produce more complex fracture networks than water fracturing and LN2 fracturing.</div>","PeriodicalId":16717,"journal":{"name":"Journal of Petroleum Science and Engineering","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Petroleum Science and Engineering","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0920410522011020","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"Earth and Planetary Sciences","Score":null,"Total":0}

引用次数: 0

Abstract

Hydraulic fracturing using water-based fracturing fluids is widely used in coalbed methane (CBM) reservoir development. However, the stimulation efficiency of conventional hydraulic fracturing in CBM reservoir is low. Liquid nitrogen (LN2) cryogenic fracturing is one possible method to improve the stimulation efficiency. To test the feasibility of the LN2 cryogenic fracturing, laboratory fracturing tests were conducted to investigate the performances of different LN2 cryogenic fracturing methods in this paper. The breakdown pressure and fracture morphology of water fracturing, LN2 direct fracturing, LN2 freeze fracturing, LN2 freeze-thaw fracturing and LN2 compound fracturing were compared. And the mechanisms of different cryogenic fracturing techniques are revealed. The results demonstrate that thermal damage caused by LN2 freezing is the main reason for the complicated fracture pattern in cryogenic fracturing. LN2 freeze-thaw fracturing has the lowest breakdown pressure and can create the most complex fractures among these cryogenic fracturing methods due to the huge thermal damage. LN2 freeze fracturing has the highest breakdown pressure. Because the thermal damage cracks and natural fractures in frozen rock are in freezing shrinkage, which activation are difficult. LN2 compound fracturing is the most potential technologies, which can produce more complex fracture networks than water fracturing and LN2 fracturing.

查看原文本刊更多论文

不同煤层低温压裂方法的实验比较

水基压裂液水力压裂在煤层气储层开发中应用广泛。然而，煤层气储层常规水力压裂增产效率较低。液氮(LN2)低温压裂是提高增产效率的一种可行方法。为验证LN2低温压裂的可行性，开展了室内压裂试验，研究了不同LN2低温压裂方法的性能。对比了水压裂、LN2直接压裂、LN2冷冻压裂、LN2冻融压裂和LN2复合压裂的破裂压力和裂缝形态。揭示了不同低温压裂技术的作用机理。结果表明，LN2冻结引起的热损伤是造成低温压裂裂缝形态复杂的主要原因。LN2冻融压裂由于其巨大的热损伤，是低温压裂中破裂压力最低、裂缝最复杂的压裂方式。LN2冻结压裂的破裂压力最高。由于冻土岩中的热损伤裂缝和天然裂缝处于冻缩状态，激活难度较大。LN2复合压裂是最具潜力的压裂技术，它可以产生比水压裂和LN2压裂更复杂的裂缝网络。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Journal of Petroleum Science and Engineering 工程技术-地球科学综合

CiteScore

11.30

自引率

0.00%

发文量

1511

审稿时长

13.5 months

期刊介绍： The objective of the Journal of Petroleum Science and Engineering is to bridge the gap between the engineering, the geology and the science of petroleum and natural gas by publishing explicitly written articles intelligible to scientists and engineers working in any field of petroleum engineering, natural gas engineering and petroleum (natural gas) geology. An attempt is made in all issues to balance the subject matter and to appeal to a broad readership. The Journal of Petroleum Science and Engineering covers the fields of petroleum (and natural gas) exploration, production and flow in its broadest possible sense. Topics include: origin and accumulation of petroleum and natural gas; petroleum geochemistry; reservoir engineering; reservoir simulation; rock mechanics; petrophysics; pore-level phenomena; well logging, testing and evaluation; mathematical modelling; enhanced oil and gas recovery; petroleum geology; compaction/diagenesis; petroleum economics; drilling and drilling fluids; thermodynamics and phase behavior; fluid mechanics; multi-phase flow in porous media; production engineering; formation evaluation; exploration methods; CO2 Sequestration in geological formations/sub-surface; management and development of unconventional resources such as heavy oil and bitumen, tight oil and liquid rich shales.