Article(id=1322595085728986062, tenantId=1146029695717560320, journalId=1225396423026438145, issueId=1322594813749350688, articleNumber=null, orderNo=null, doi=null, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1712592000000, receivedDateStr=2024-04-09, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1793260841065, onlineDateStr=2026-10-29, pubDate=1740412800000, pubDateStr=2025-02-25, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1793260841065, onlineIssueDateStr=2026-10-29, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1793260841065, creator=13701087609, updateTime=1793260841065, updator=13701087609, issue=Issue{id=1322594813749350688, tenantId=1146029695717560320, journalId=1225396423026438145, year='2025', volume='45', issue='2', pageStart='1', pageEnd='288', issueExtLink='null', onlineDate='null', pubDate='1740412800000', pubDateStr='2025-02-25', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1793260776220, creator='13701087609', updateTime=1793260776220, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext=null, issueFiles=null, downloadFileDto=null}, startPage=106, endPage=115, ext={EN=ArticleExt(id=1322595085963867087, articleId=1322595085728986062, tenantId=1146029695717560320, journalId=1225396423026438145, language=EN, title=Analysis of Influencing Factors of Horizontal Well Productivity After Fracturing in Tunlan Block, columnId=null, journalTitle=Mining Research and Development, columnName=null, runingTitle=null, highlight=null, articleAbstract=

According to the drainage data of 7 horizontal wells in Tunlan block, the productivity characteristics of horizontal wells were analyzed. It is found that there are great differences in water production and productivity of horizontal wells. The influence of geological factors on productivity was analyzed from the aspects of coal seam buried depth, coal seam thickness and roof and floor lithology. The influence of engineering factors on productivity was analyzed from the aspects of fracturing curve characteristics, average displacement, fracturing fluid amount and sand addition. The influence of drainage factors on productivity was analyzed from the aspects of wellhead casing pressure, drainage continuity and water production. The results show that the gas production of horizontal wells is affected by the water production. In general, there is a positive correlation between the two, but too much water production will lead to a decrease in gas production. Hydrogeological conditions have an impact on the productivity of some horizontal wells. The increase of coal seam burial depth, coal seam thickness and roof mudstone thickness is conducive to the extraction of coal bed methane. The gas production of horizontal wells with low displacement fracturing is low, the fracturing fluid amount and sand addition should also be kept in a certain range, and excessive use will lead to a decrease in gas production. The descending and stable fracturing curves account for 81.4% of the horizontal well fracturing curves. The higher the proportion of the curve, the greater the gas production. In the process of drainage, the long maintenance time of the stuck pump, the decrease of the wellhead casing pressure and the high water production will reduce the gas production. The grey correlation analysis shows that the gas content of coal seam is the main controlling factor of horizontal well productivity. The research results can provide reference for the development of horizontal wells in Tunlan block.

, authors=Weidong CHEN1, Xiaoxia SONG1, 2, Liqiang DU3, Jiwei YAN1, Yanfei LIU1, Hao GUO3, Yu WANG1, authorsList=Weidong CHEN, Xiaoxia SONG, Liqiang DU, Jiwei YAN, Yanfei LIU, Hao GUO, Yu WANG, authorCompany=null, correspAuthors=null, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1322595091772978166, articleId=1322595085728986062, tenantId=1146029695717560320, journalId=1225396423026438145, language=CN, title=屯兰区块水平井压裂后产能影响因素分析, columnId=1226462294490657775, journalTitle=矿业研究与开发, columnName=采矿与矿山充填, runingTitle=null, highlight=null, articleAbstract=

根据屯兰区块7口水平井的排采资料,分析了水平井的产能特征,发现水平井的产水、产能出现较大的差异。从煤层埋深、煤层厚度、顶底板岩性等方面分析了地质因素对产能的影响,从压裂曲线特征、平均排量、压裂液用量和加砂量等方面分析了工程因素对产能的影响,以及从井口套压、排采连续性和产水量等方面分析了排采因素对产能的影响。结果表明:水平井的产气量受产水量影响,一般情况下,二者呈正相关关系,但产水量过大会导致产气量降低;水文地质条件对部分水平井的产能存在影响,煤层埋深、煤层厚度、顶板泥岩厚度的增加,均有利于煤层气的抽采;低排量压裂的水平井产气量低,压裂液用量与加砂量也应保持在一定范围,用量过大会导致产气量降低;下降型和稳定型压裂曲线占水平井压裂曲线的81.4%,曲线占比越高,产气量越大。在排采过程中,卡泵检修时间长、井口套压降低、产水过高均会导致产气量降低。采用灰色关联分析法分析得出,煤层含气量是水平井产能的主控因素。研究结果可为屯兰区块水平井开发提供参考。

, authors=陈伟东1, 宋晓夏1, 2, 杜立强3, 阎纪伟1, 刘彦飞1, 郭浩3, 王昱1, authorsList=陈伟东, 宋晓夏, 杜立强, 阎纪伟, 刘彦飞, 郭浩, 王昱, authorCompany=null, correspAuthors=null, authorNote=

陈伟东(1999—),男,山西新绛人,硕士研究生,主要从事煤层气地质研究。E-mail:

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陈伟东(1999—),男,山西新绛人,硕士研究生,主要从事煤层气地质研究。E-mail:

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label=Table 1, caption=

Productivity of coalbed methane horizontal wells

, figureFileSmall=null, figureFileBig=null, tableContent=
井号最高产气量/(m3/d)平均产气量/(m3/d)最高产水量/(m3/d)平均产水量/(m3/d)
L043 7832 500.0029.020.89
L053 5802 263.5928.011.01
L066 8985 159.0528.513.41
L077 8245 329.4336.013.98
L085 0423 668.9726.310.47
L093 2472 151.3528.49.20
L105 0513 377.0729.59.34
), ArticleFig(id=1322595101046583366, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322595085728986062, language=CN, label=表1, caption=

煤层气水平井的产能情况

, figureFileSmall=null, figureFileBig=null, tableContent=
井号最高产气量/(m3/d)平均产气量/(m3/d)最高产水量/(m3/d)平均产水量/(m3/d)
L043 7832 500.0029.020.89
L053 5802 263.5928.011.01
L066 8985 159.0528.513.41
L077 8245 329.4336.013.98
L085 0423 668.9726.310.47
L093 2472 151.3528.49.20
L105 0513 377.0729.59.34
), ArticleFig(id=1322595101109497927, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322595085728986062, language=EN, label=Table 2, caption=

Fracturing curve types of horizontal wells

, figureFileSmall=null, figureFileBig=null, tableContent=
井号稳定型波动型下降型
L04514
L05245
L06047
L07425
L08415
L09813
L10019
占比30.7%18.6%50.7%
), ArticleFig(id=1322595101184995400, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322595085728986062, language=CN, label=表2, caption=

水平井压裂曲线类型

, figureFileSmall=null, figureFileBig=null, tableContent=
井号稳定型波动型下降型
L04514
L05245
L06047
L07425
L08415
L09813
L10019
占比30.7%18.6%50.7%
), ArticleFig(id=1322595101268881481, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322595085728986062, language=EN, label=Table 3, caption=

Geology, construction and drainage parameters of horizontal wells

, figureFileSmall=null, figureFileBig=null, tableContent=
平均产气量/m3平均埋深/m含气量/(m3/t)压裂液用量/m3平均排量/(m3/min)总砂量/m3平均产水量/m3卡泵时间/d平均套压/MPa
2 50074813.758 3337.51607.0020.8901.13
2 26475013.546 0617.29438.7811.0100.99
5 15969514.508 1088.43559.4413.4151.12
5 32967415.237 0018.18480.0213.98101.52
3 66963314.878 7668.30639.6410.4701.59
2 15158214.808 9396.13562.289.2001.45
3 37755614.345 2738.05359.749.34201.16
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水平井的地质、施工和排采参数

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平均产气量/m3平均埋深/m含气量/(m3/t)压裂液用量/m3平均排量/(m3/min)总砂量/m3平均产水量/m3卡泵时间/d平均套压/MPa
2 50074813.758 3337.51607.0020.8901.13
2 26475013.546 0617.29438.7811.0100.99
5 15969514.508 1088.43559.4413.4151.12
5 32967415.237 0018.18480.0213.98101.52
3 66963314.878 7668.30639.6410.4701.59
2 15158214.808 9396.13562.289.2001.45
3 37755614.345 2738.05359.749.34201.16
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Grey correlation degree and rank of productivity after fracturing of horizontal wells

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参数类别影响因素关联度排序
地质平均埋深0.5956
含气量0.7651
施工压裂液用量0.5417
平均排量0.6842
加砂量0.5258
排采平均产水量0.6055
卡泵时间0.6624
平均套压0.6663
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水平井压裂后产能灰色关联度及排序

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参数类别影响因素关联度排序
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含气量0.7651
施工压裂液用量0.5417
平均排量0.6842
加砂量0.5258
排采平均产水量0.6055
卡泵时间0.6624
平均套压0.6663
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屯兰区块水平井压裂后产能影响因素分析
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陈伟东 1 , 宋晓夏 1, 2 , 杜立强 3 , 阎纪伟 1 , 刘彦飞 1 , 郭浩 3 , 王昱 1
矿业研究与开发 | 采矿与矿山充填 2025,45(2): 106-115
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矿业研究与开发 |采矿与矿山充填 2025 , 45 (2) : 106 -115
屯兰区块水平井压裂后产能影响因素分析
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陈伟东1 , 宋晓夏1, 2, 杜立强3, 阎纪伟1, 刘彦飞1, 郭浩3, 王昱1
作者信息
  • 1.太原理工大学 矿业工程学院,山西 太原 030024
  • 2.煤系关键矿产资源精细勘查山西省重点实验室,山西 太原 030001
  • 3.山西西山蓝焰煤层气有限责任公司,山西 古交市 030200
作者简介:

陈伟东(1999—),男,山西新绛人,硕士研究生,主要从事煤层气地质研究。E-mail:

Analysis of Influencing Factors of Horizontal Well Productivity After Fracturing in Tunlan Block
Weidong CHEN1 , Xiaoxia SONG1, 2, Liqiang DU3, Jiwei YAN1, Yanfei LIU1, Hao GUO3, Yu WANG1
Affiliations
  • 1.College of Mining Engineering, Taiyuan University of Technology, Taiyuan, Shanxi 030024, China
  • 2.Shanxi Key Laboratory of Fine Exploration of Coal-Based Critical Mineral Resources, Taiyuan, Shanxi 030001, China
  • 3.Shanxi Xishan Lanyan Coal Bed Methane Co., Ltd., Gujiao, Shanxi 030200, China
出版时间: 2025-02-25
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根据屯兰区块7口水平井的排采资料,分析了水平井的产能特征,发现水平井的产水、产能出现较大的差异。从煤层埋深、煤层厚度、顶底板岩性等方面分析了地质因素对产能的影响,从压裂曲线特征、平均排量、压裂液用量和加砂量等方面分析了工程因素对产能的影响,以及从井口套压、排采连续性和产水量等方面分析了排采因素对产能的影响。结果表明:水平井的产气量受产水量影响,一般情况下,二者呈正相关关系,但产水量过大会导致产气量降低;水文地质条件对部分水平井的产能存在影响,煤层埋深、煤层厚度、顶板泥岩厚度的增加,均有利于煤层气的抽采;低排量压裂的水平井产气量低,压裂液用量与加砂量也应保持在一定范围,用量过大会导致产气量降低;下降型和稳定型压裂曲线占水平井压裂曲线的81.4%,曲线占比越高,产气量越大。在排采过程中,卡泵检修时间长、井口套压降低、产水过高均会导致产气量降低。采用灰色关联分析法分析得出,煤层含气量是水平井产能的主控因素。研究结果可为屯兰区块水平井开发提供参考。

水平井  /  煤层气  /  水力压裂  /  产能特征  /  灰色关联分析法

According to the drainage data of 7 horizontal wells in Tunlan block, the productivity characteristics of horizontal wells were analyzed. It is found that there are great differences in water production and productivity of horizontal wells. The influence of geological factors on productivity was analyzed from the aspects of coal seam buried depth, coal seam thickness and roof and floor lithology. The influence of engineering factors on productivity was analyzed from the aspects of fracturing curve characteristics, average displacement, fracturing fluid amount and sand addition. The influence of drainage factors on productivity was analyzed from the aspects of wellhead casing pressure, drainage continuity and water production. The results show that the gas production of horizontal wells is affected by the water production. In general, there is a positive correlation between the two, but too much water production will lead to a decrease in gas production. Hydrogeological conditions have an impact on the productivity of some horizontal wells. The increase of coal seam burial depth, coal seam thickness and roof mudstone thickness is conducive to the extraction of coal bed methane. The gas production of horizontal wells with low displacement fracturing is low, the fracturing fluid amount and sand addition should also be kept in a certain range, and excessive use will lead to a decrease in gas production. The descending and stable fracturing curves account for 81.4% of the horizontal well fracturing curves. The higher the proportion of the curve, the greater the gas production. In the process of drainage, the long maintenance time of the stuck pump, the decrease of the wellhead casing pressure and the high water production will reduce the gas production. The grey correlation analysis shows that the gas content of coal seam is the main controlling factor of horizontal well productivity. The research results can provide reference for the development of horizontal wells in Tunlan block.

Horizontal well  /  Coal bed methane  /  Hydraulic fracturing  /  Productivity characteristic  /  Grey relational analysis method
陈伟东, 宋晓夏, 杜立强, 阎纪伟, 刘彦飞, 郭浩, 王昱. 屯兰区块水平井压裂后产能影响因素分析. 矿业研究与开发, 2025 , 45 (2) : 106 -115 .
Weidong CHEN, Xiaoxia SONG, Liqiang DU, Jiwei YAN, Yanfei LIU, Hao GUO, Yu WANG. Analysis of Influencing Factors of Horizontal Well Productivity After Fracturing in Tunlan Block[J]. Mining Research and Development, 2025 , 45 (2) : 106 -115 .
水力压裂技术是国内外常用的煤层气井有效增产措施,通过高压泵将压裂液挤入煤层中,扩展并延伸至煤层中的裂缝,提高煤储层裂缝的连通性和渗透率。在此过程中,注入支撑剂支撑裂缝,提高流体流动能力,增加煤层气产量[1-2]。
影响煤层气井产量的主要因素有地质因素、工程因素和排采因素。地质因素包括沉积环境、构造背景、宏观煤岩学、水动力分布、顶板密封能力、埋深、煤层厚度、含气量、渗透率、裂缝特征、地应力、储层压力、临界储层比、临界解吸压力等。工程因素包括液柱高度、压裂液和支撑剂体积、等效泄气半径、煤粉生成引起的流速敏感性效应、生产初期工作液面下降速率、降压速率等[3]。傅雪海等[4]、李金海等[5]研究了煤储层的相对渗透率和井底压力对煤层气产能的影响,使用合理的降压制度控制煤层气的排采速率,可以防止流体携带煤粉和支撑剂,延长产气高峰期。GAO等[6]、刘人和等[7]根据煤层气生产试井数据,重点分析了原始渗透率、煤层厚度、埋深、含气量、饱和度、临界解吸压力、水文地质条件等因素对直井产能的影响。赵欣等[8]、陈振宏等[9]、邵先杰等[10]研究了地质、施工和排采制度等因素对直井产能的影响,施工时用液量越高,平均排量越大,加砂量越大,投产后气井产量越高,破裂压力梯度低的井产能高。崔泽宏等[11]、张迁等[12]研究了储层的地质特征、压裂缝长、应力系数和煤结构占比,并分析了以上因素对直井产气效果的影响。
在影响产气量方面也有学者用数值模拟进行分析。李国富等[13]对比现今含气量与原位含气量,用数值模拟法预测了含气量的降低情况。梁冰等[14]通过模拟认为煤层气产气量高和侵入岩区域的渗透率高、孔隙度大有关。任建华等[15]采用数值模拟方法分析了柳林区块的直井产气情况,认为产气量低与压裂裂缝过早闭合使支撑效果变差有关。刘世奇等[16]认为煤基质收缩效应和有效应力作用都会影响煤层的渗透率,从而影响煤层气井排采速率。前人主要研究了煤层气直井的产能因素,在分析水平井的产能因素方面的研究较少,同时需要从多方面对水平井的产能影响因素进行分析。
西山煤田屯兰区块煤层气资源丰富,截至2023年,屯兰区块已经施工了193口直井,抽采时间超过10 a,是我国煤层气开发时间比较长、资料较齐全的地区之一。随着直井的产能逐渐降低,2022年在直井范围内进行了水平井的压裂施工,但水平井的产能差异较大,研究水平井的产能控制因素有利于研究区的煤层气开发。
本文以西山煤田屯兰区块水平井的实际生产数据为基础,综合地质和施工资料,对水平井的生产特征进行逐步分析和总结。在地质方面,分析了煤层特征和水文条件对产能的影响;通过水力压裂曲线类型的占比、压裂液的排量和用量等参数与产气量的关系,分析了压裂施工对产能的影响;以及从排采连续性、井口套压、排水速率等方面说明了排采制度对产能的影响。综合以上因素,讨论水平井产能特征和差异的主控因素,以期为研究区周边煤层气开发提供参考。
水平井位于西山煤田屯兰区块南部土地沟断层与王芝茂断层之间(见图1),地质构造简单。由于研究区原有42口直井的产气量较低,普遍在500 m3/d以下,且产气量逐渐降低。在原有直井的基础上,在太原组8号煤层布置了7口水平井,分布在直井之间。L07井水平段长723 m, L10井水平段长676 m,其余井水平段长700 m。根据应力场模拟[17]和微震监测,水平井水平段方向与最大水平主应力方向相近。
研究区7口水平井采用水力喷砂射孔工艺和连续油管底封拖动压裂,将施工曲线分为4个阶段:喷砂射孔阶段(A);前置液阶段(B);携砂液阶段(C);停泵阶段(D)(见图2)。水平井压裂时分段为8~12段,段间距为60~80 m,施工排量为5.5~8.5 m3/min,压裂液用量为400~1 150 m3,携砂液占比为60%~75%,支撑剂为不同粒径的石英砂(20目、40目),用砂量为15.83~80.7 m3,水平井压裂时的破裂压力为12.91~38.33 MPa,闭合压力为7.1~19.83 MPa。
研究区水平井从2022年11月开始产气至2023年9月,取得了较为丰富的水平井生产动态资料,由于水平井的投产时间不同,开始产气的时间也不同,因此取相同排采时长(150 d)的产气数据分析了水平井的生产特征。
从水平井150 d的排采曲线来看(见图3),产气初期(30 d),在埋深的作用下,产气量开始上升[18],根据水平井产水、产气曲线的变化特征,将水平井划分为3种类型:
(1)产水、产气峰值明显。L05井在产气30 d内出现第一个峰值,峰值较低[19],压裂效果较差。
(2)无峰值曲线连续。L04、L08、L09井连续产水、产气,但没有明显的峰值,产气初期的最高日产气量较低。
(3)无峰值曲线断续。L06、L07、L10井没有明显产气峰值;产气量在25 d内上升到4 000 m3/d以上,产气能力较高,初期的产气情况反映出压裂效果较好;但产气过程中出现的波动(如卡泵)也会影响产能。
屯兰区块7口水平井150 d的产能数据显示,水平井的平均产气量(Qn)为:Q7>Q6>Q8>Q10>Q4>Q5>Q9(见表1)。
水平井产气量的差异较大,水平井平均产气量小于等于2 500 m3/d的有L04、L05、L09,平均产气量在2 500~5 000 m3/d之间的有L08、L10,平均产气量大于5 000 m3/d的有L06、L07(见表1)。除了L07井,水平井的产水量都在20 m3/d以上;L04井排采100 d后产水量下降,而其余水平井排采25 d后,产水量出现不同程度的下降(见图3)。
由表1中水平井的产能数据可知,各水平井的最高产水量均达到25 m3/d以上,除L04井外,其余水平井的平均产水量普遍较低。L04 井的平均产水量最高,为20.89 m3/d;L09 井的平均产水量最低,为9.20 m3/d。平均产气量与平均产水量的关系图如图4 所示。由图4可知,各水平井的平均产气量越多,平均产水量也越多。
根据研究区实际钻井和测井数据得知,8号煤埋深为530~850 m,煤层厚度为1.28~5.17 m。8号煤层埋深、煤层厚度和含气量的等值线如图5所示。由图5(a)可知,煤层从北向南埋深变大变薄。由图5(b)可知,土地沟断层和王芝茂断层之间的煤层气含量较高[20],屯兰区块水平井所在的8号煤层的含气量为9.5~16.7 m3/t,水平井区域的煤层气含量为12.5~16.5 m3/t。
煤层埋深、煤层厚度与平均产气量的关系如图6所示。由图6可知,当煤厚小于4 m时,随着埋深和煤层厚度的增加,L06、L07、L08、L10井产气量呈增大趋势;当煤层厚度大于4 m时,煤层埋深超过700 m, L04、L05井的产气量低,未超过2 500 m3/d,这是因为在煤层厚度大以及夹矸赋存时,射孔时会将部分夹矸射开,造成垂向渗透率的非均质性强,出现产气低的现象[21]。
根据煤层顶底板的岩性解释,研究区的8号煤层顶板主要有泥岩和L1灰岩。
水平井所在区域的顶板以泥岩为主,泥岩岩性致密、塑性好、煤层气封盖条件好、含气量高。顶板泥岩厚度与平均产气量的关系如图7所示。除了L05井外,其余水平井顶板泥岩的厚度均随着埋深的增加而增加,厚度最大为1.07 m。煤层顶板泥岩越厚,煤层含气量越高,水平井的产能越高,L09、L04井产气量低可能和其他因素有关。
研究区地下水位为700~750 m,地下水自东向西流动,地下水位与L04、L05、L06井的埋深接近。由于L04井离断层较近,裂缝较发育,且封闭性差,与地下水位埋深相近可能会导致地下水流到煤层中,使水平井出现产水量大的现象[22]。
以L09井为例,采用两种排量的压裂施工(见图8),L09井施工时前八段使用较粗的油管压裂,总排量为5 m3/min,油套排量比为3:2,以油管压裂为主;后四段更换了细油管,总排量达8 m3/min以上,油套排量比为1:15,以套管压裂为主。
排量大有利于形成较宽的裂缝,降低压裂液的滤失,还能增大裂缝中支撑剂的运移距离,使裂缝扩展的更远。低排量的漏失量较大,携砂能力差,支撑剂易堆积,不能对裂缝形成有效支撑,裂缝难以向远端扩展[23],压裂效果差。整体来看,L09井以油管压裂为主,排量低,平均产气量为2 151.35 m3/d,平均产气量最低。
压裂液的主要作用是在煤层中产生人工压裂缝,增大煤储层的渗透率,从而提高煤层气井的产能。从压裂液用量和加砂量方面来说,加砂量占压裂液用量的6.3%~7.3%。
压裂液用量、加砂量与平均产气量的关系如图9所示。
取平均产气量的中位数L10井的产气量为中产井,L04、L05、L08、L09井的压裂液用量多,产气量少;L06、L07井的压裂液用量少,产气量多。大液量容易形成高流体压力,获得较长的压裂裂缝,同时压裂裂缝与天然裂缝的连通也能增加煤层的渗透性和连通性[24]。随着压裂裂液用量和加砂量的增多,产能也在上升,如L06井。对比L04、L06、L07、L09井可知,压裂液用量、加砂量并非越多越好,过多也会使水平井的产能降低。
通常情况下,不同形态施工曲线与产气量的关系为:下降型>稳定型>波动型>上升型[25-27]。将水平井75段压裂曲线分类后,只有下降型、稳定型和波动型3种类型的压裂曲线(见图10),施工中泵压无异常升高。
水平井压裂曲线类型见表2。统计压裂曲线的段数可得,稳定型和下降型曲线共占水平压裂曲线的81.4%。煤层厚度、埋深与下降型和稳定型曲线占比的关系如图11所示。整体来看,7口水平井的压裂效果较好,水平井的压裂效果随埋深和煤层厚度的增大而增大。压裂施工效果越好,越有利于水平井的产气。
排采中断引起的地层压力波动会降低储层渗透率,影响煤层气的产出。由于L07、L08、L10井卡泵检修,产气曲线出现大幅度波动(如L10井,见图3),产水、产气不连续,产气量降低。重新开始排采后,产气量恢复迅速,相比于L07、L08, L10井,产气量的增长相对较低,可能是L10井检修时间长导致储层渗透率降低[29]。
井口套压与产气量的关系如图12所示。
井口套压与日产气量相互影响。排采25 d时,井口套压与日产气量变化趋势十分相似,二者呈正相关关系,煤层产气量增加时,井口套压相应增加;排采25 d后,产气量增加,井口套压下降,二者呈负相关关系;产气75 d后,井口套压和产气量呈正相关关系,二者均开始下降。
井口套压和产气量的关系分为两种,一种是二者同时从0开始增加,开始产气时井口套压随产气量的增长而增长(见图12(a));另一种是在产气时井口套压已经达到一个初始值(见图12(b))。
井口套压与产气量的第二种关系表现为:在产气过程中会产出一定量的煤粉,被气体携带至井口后,产生堵塞,使井口套压上升,产气量不增加。开始产气时井口套压已达到0.7 MPa(见图12(b)),排采过程中,集气管压的增大会减小管压和井口套压的压差,导致产气量下降,而套压可能会增加[28]。
一般来说,平均日产水量和平均日产气量之间呈正相关关系(见图4),产水量越多,产气量也越多,如L06、L07井产水量多,产气量也多。
随着产水量的增加,储层的有效应力也在增加[30],同时排水降压过快也会引起储层的压敏效应和速敏效应。产水过快时,压降速度也会变快,同时储层的有效应力增长也变快,造成孔裂隙压缩,导致渗透率降低,从而使水平井的产气量降低;例如L04井的产水过快,携带煤粉和支撑剂使渗透率降低,从而使产气量降低[31]。产水量稳定时,当压力降低至反弹压力时[32],煤基质收缩使储层孔隙度和渗透率有一定幅度的增加[33],例如L09井产气量在60 d左右回升[34]。控制产水能促使渗透率反弹、延长气井寿命、提高采收率[35]。
利用灰色关联分析法,从数学统计的角度使用相关数据定量确定各影响因素与产能之间的关联度,比较各因素之间的关联度的相对大小,然后找出影响系统整体发展态势的主要因素,从而能够更加直观地分析这些因素的重要程度。水平井的地质、施工和排采参数见表3。
将煤层气井平均产气量作为参考数列,将8号煤层的埋深、含气量、压裂液用量、平均排量、加砂量、平均产水量、卡泵时间、平均套压等因素作为比较数列。
为确保分析的准确性,必须在进行灰色关联分析之前,对这些数据进行无量纲化以及标准化处理(见式(1)、式(2)),对比比较序列与参考序列的相似度Δi(k)(见式(3)),再求取参考序列与各比较序列在曲线各点的关联系数ξi(k)(见式(4))。
式中:Y0(k)为标准化处理后的比较序列;Yi为比较序列中的一组数据;Ymax、Ymin分别为比较序列的最大值、最小值;Xij为参考序列中的一组数据;Xi max、Xi min分别为参考序列的最大值、最小值;Xij(k)为标准化处理后的参考序列;ρ为分辨系数,ρ>0,通常取0.5;Δmax、Δmin分别为参考序列和比较序列绝对差值的最大值、最小值。
取各比较数列的ξi(k)算术平均值,从而得到一个能够表征整体关联程度的参数(见式(5)),便于比较序列之间的关联性。
式中:ri(k)为对比序列与某一参考序列关联程度的平均值;N为这一参考序列的个数。
水平井压裂后产能灰色关联度及排序见表4。
关联性最高的4个因素分别为含气量、平均排量、平均套压、卡泵时间(排采连续性),这4个因素共同作用能够获得较高的产气量,而平均产水量、平均埋深、压裂液用量、加砂量对煤层气水平井产能的影响相对较小。
(1)在地质因素方面,产气量随着埋深和煤层厚度的增加而增加;顶板泥岩越厚,储层的封盖条件越好,在排采时会有更高的产气量;8号煤层位于地下水滞留区,水动力条件较弱,但含气性较好。
(2)在压裂施工方面,加砂量、压裂液用量与产气量之间的关系相似:加砂量、压裂液用量过大时反而会降低产气量;对比7口水平井,低排量的L09井的产气量最低。
(3)在排采制度方面,分析了排采连续性、井口套压和排水速率对产能的影响。在排采期间出现中断或停泵等情况时,可能导致储层压力波动并且由于堵塞裂缝导致渗透率降低,从而降低产气量;长期排采过程中发现井口套压与产气量曲线变化趋势相似。
(4)采用灰色关联分析法分析得出,含气量是影响产气量的主控因素,关联性较高的3个因素依次为含气量、平均排量和井口套压。研究结果可为屯兰区块水平井开发提供参考。
  • 山西省科技重大专项项目(20201102002-1; 202101080301014)
  • 山西省基础研究计划青年项目(20210302124109; 20210302123061)
  • 国家自然科学青年基金项目(42302200)
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2025年第45卷第2期
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  • 接收时间:2024-04-09
  • 首发时间:2026-10-29
  • 出版时间:2025-02-25
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  • 收稿日期:2024-04-09
基金
山西省科技重大专项项目(20201102002-1; 202101080301014)
山西省基础研究计划青年项目(20210302124109; 20210302123061)
国家自然科学青年基金项目(42302200)
作者信息
    1.太原理工大学 矿业工程学院,山西 太原 030024
    2.煤系关键矿产资源精细勘查山西省重点实验室,山西 太原 030001
    3.山西西山蓝焰煤层气有限责任公司,山西 古交市 030200
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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
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红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
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