Influencing factors on gas production effect of acid fractured CBM Wells in deep coal seam of Daning-Jixian Block
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摘要: 大宁−吉县区块深层8号煤层面积大、厚度大、分布广、煤层气资源富集，体积酸压后试采获得突破，但试采井产能差异大，产能主控因素不明确，严重制约煤层气开发进程。针对大宁−吉县区块2 000 m以深的上石炭统本溪组8号煤层试采井，从地质条件、酸压施工和排采制度中选取28个典型评价指标，运用灰色关联方法对煤层气井酸压后产能进行敏感性分析并提出相应技术对策。结果表明：酸压施工因素对产能的影响高于地质因素和排采因素；砂量、酸量、见气前产水指数、泥质含量和阵列感应电阻率是影响该区块气井产能的主控因素，可将阵列感应电阻率和泥质含量作为筛选有利区的重要指标；提出采用低密度、低粒径支撑剂提高支撑剂运移距离与支撑裂缝长度；控制排采速度不超过200 m3/d，以保证深层煤层气平稳连续产出。该研究可为深层煤层气有利区筛选、施工参数优化以及排采制度调整提供参考。Abstract: The No.8 deep coal seam in Daning-Jixian Block is large, thick, widely distributed, and rich in coalbed methane(CBM) resources. After volume acid fracturing, a breakthrough has been achieved in the producing test. However, the productivity of the testing wells varies greatly, and the major controlling factors of productivity are not clear, severely restricting the CBM development. In this paper, the testing wells in the No.8 coal seam with a buried depth of more than 2 000 m of the Upper Carboniferous Benxi Formation in Daning-Jixian Block were taken as the research object, and 28 typical evaluation indicators were selected from geological conditions, acid fracturing construction and drainage technology. The grey correlation method was applied to analyze the production sensitivity of CBM wells after acid fracturing, and corresponding technical measures were presented. The results show that factors of acid fracturing construction have a greater impact on productivity than geological factors and drainage factors. Sand volume, acid dosage, water production index before CBM breakthrough, mud content and array induction resistivity(M2RX) are the main controlling factors of productivity. The M2RX and mud content can be used as important indicators to screen out favorable areas. Low density and small particle size proppants are proposed to increase the migration distance of proppants and the propped fracture length. Gas production rate is controlled below 200 m3/d to ensure the smooth and continuous production of deep CBM. This research could provide reference for the selection of favorable areas, optimization of construction parameters and adjustment of drainage and production systems.
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表 1 10%盐酸浸泡前后煤岩抗压强度变化
Table 1 Changes of coal compressive strength before and after soaking in 10% hydrochloric acid
岩心
编号抗压强度/MPa 备注 天然状态 酸化后 煤心1 30.27 28.80 均为紧邻钻取岩心对比 煤心2 27.52 22.05 煤心3 24.95 15.78 
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表 2 10%盐酸浸泡前后煤岩气测渗透率对比
Table 2 Comparison of measured permeability of coal and gas before and after soaking in 10% hydrochloric acid
岩心编号 渗透率/10−3 μm2 原始状态 浸泡后 浸泡后/原始状态比值 煤心4 0.054 7 0.554 5 10.14 煤心5 0.014 1 0.124 9 8.86 煤心6 0.059 8 0.956 1 15.99 煤心7 0.013 3 0.155 6 11.70
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表 3 试验井的地质、工程和生产参数
Table 3 Geological, engineering and production parameters of test wells
井号 地质参数 电阻率/
(Ω·m)泥质质量
分数/%储层有效
厚度/m射孔厚
度/m自然伽
马/API声波时差/
(μs·m−1)含气量/
(m3·t−1)高程/
m储层压
力/MPa密度/
(g·cm−3)临界解吸压
力/MPa孔隙
率/%临储比 井径扩
大率/%构造
曲率DJ3-2 588 12.3 9.8 5.5 54.5 363 28.2 −710 19.7 1.45 19.7 4.34 1.00 0.01 0.10 DJ3-4 535 12.3 8.9 6.0 48.3 382 27.5 −917 21.3 1.45 21.3 4.40 1.00 6.16 0.07 DJ3-6 648 15.5 7.5 3.5 45.4 397 27.2 −1 089 22.9 1.43 22.8 4.28 1.00 6.02 0.09 DJ3-7 522 14.5 7.6 5.0 46.3 376 27.8 −955 22.2 1.49 22.2 4.58 1.00 1.48 0.10 DJ6-10 279 15.1 7.9 4.5 35.4 401 28.7 −1 124 20.8 1.50 18.8 4.34 0.90 9.65 0.12 DJ7-5 560 17.7 7.3 5.0 49.7 404 29.2 −996 22.2 1.47 20.8 2.80 0.93 12.24 0.08 DJ4-8 77 16.9 7.6 4.0 58.5 390 27.7 −1 018 22.1 1.42 19.5 4.94 0.88 19.90 0.13
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井号 酸压施工参数 排采参数 每米加
砂强度/
(m3·m–1)总砂
量/m3氢离子
量/109 mol施工排量/
(m3·min–1)总液
量/m3监测裂
缝破裂
面积/m2清洁液量
加液强度/
(m·m–3)清洁液
量/m3前置液
占压裂
液比值平均砂
比/%停泵压
力/MPa见气前
产水指数/
(m3·d−1·MPa−1)产气时井
底流压/
MPaDJ3-2 4.08 40.0 1.55 11.5 1 905.0 30 225 153.88 1 508 0.21 2.5 40.0 25.44 17.90 DJ3-4 2.14 12.7 0.83 7.5 1 011.5 20 489 87.69 520 0.49 5.4 28.7 7.63 20.40 DJ3-6 1.44 10.8 3.21 7.5 1 346.0 83 790 132.93 997 0.26 1.7 31.5 22.94 20.27 DJ3-7 5.03 38.2 2.87 9.8 1 135.0 18 840 64.74 492 0.57 10.0 35.2 8.46 18.13 DJ6-10 3.92 31.0 4.55 10.5 1 290.0 29 673 108.86 860 0.33 4.1 39.6 9.34 15.34 DJ7-5 7.26 53.0 5.55 12.0 1 879.0 76 381 158.63 1 158 0.38 4.8 16.8 46.55 20.90 DJ4-8 0.20 1.5 2.41 6.0 1 510.0 85 376 151.32 1 150 0.24 2.00 37.6 5.35 15.63
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表 4 煤层气井酸压后产能灰色关联度及排序
Table 4 Grey correlation degree and ranking of CBM well productivity after acid fracturing
参数类别 影响因素 关联度 排序 参数类别 影响因素 关联度 排序 酸压 每米加砂强度 0.961 9 1 地质 自然伽马 0.806 1 15 酸压 总砂量 0.948 7 2 地质 声波时差 0.803 6 16 排采 见气前米产水指数 0.915 0 3 地质 含气量 0.802 8 17 酸压 酸液用量 0.912 7 4 地质 高程 0.798 9 18 酸压 施工排量 0.870 6 5 地质 储层压力 0.798 6 19 酸压 总液量 0.863 7 6 地质 密度 0.791 3 20 地质 电阻率 0.857 8 7 地质 临界解吸压力 0.789 8 21 地质 泥质含量 0.846 0 8 地质 临储比 0.780 7 22 酸压 监测裂缝破裂面积 0.842 3 9 地质 井径扩大率 0.734 7 23 酸压 清洁液量加液强度 0.839 5 10 地质 构造曲率 0.726 8 24 地质 储层有效厚度 0.831 6 11 酸压 平均砂比 0.675 0 25 酸压 清洁液量 0.827 3 12 地质 测井孔隙率 0.657 8 26 酸压 前置液占压裂液比值 0.821 7 13 排采 井底流压降 0.600 2 27 地质 射孔厚度 0.806 2 14 酸压 停泵压力 0.582 5 28
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表 5 煤层气井酸压后产能影响因素排序
Table 5 Sequence of factors affecting productivity of coalbed methane wells after acid fracturing
类别 关联度平均值 排序 酸压 0.831 4 1 地质 0.788 8 2 排采 0.757 6 3
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