Reservoir Evaluation and Development ›› 2021, Vol. 11 ›› Issue (2): 135-145.doi: 10.13809/j.cnki.cn32-1825/te.2021.02.001
• Expert Forum • Next Articles
HE Zhiliang1,2,3(),NIE Haikuan1,2,4,JIANG Tingxue1,5
Received:
2021-01-12
Online:
2021-04-26
Published:
2021-04-30
CLC Number:
HE Zhiliang,NIE Haikuan,JIANG Tingxue. Challenges and countermeasures of effective development with large scale of deep shale gas in Sichuan Basin[J].Reservoir Evaluation and Development, 2021, 11(2): 135-145.
Table 1
Comparison of fracturing parameters of deep shale gas reservoirs in China and abroad (According to references [26-28])"
压裂工艺参数 | 国外 | 国内 |
---|---|---|
分段分簇 | 单段3~10簇 | 单段2~6簇 |
射孔参数 | 孔径14 mm以上 | 孔径9.5 mm、10.5 mm、12.7 mm |
压裂模式 | 预处理酸+线性胶+滑溜水+冻胶 | 预处理酸+胶液+滑溜水+胶液 |
压裂液 | 滑溜水(1~3 mPa·s)和冻胶 | 滑溜水(9~12 mPa·s)和聚合物 |
支撑剂 | 100目、40/70目、30/50目、20/40目 | 100目、40/70目、30/50目 |
加砂方式 | 低砂比连续加砂 | 段塞加砂 |
单段压裂规模(m3) | 1 500~2 900 | 1 600~3 100 |
单段支撑剂规模(m3) | 70~110 | 50~80 |
综合砂液比(%) | 3~6 | 1.1~4.1 |
施工排量(m3/min) | 11~14 | 12~18 |
施工压力(MPa) | 70~90 | 90~118 |
Table 2
Comparison of main parameters of deep shale gas reservoir in China and abroad (According to references [2,29-32])"
区块 | 深度 (m) | 优质页岩 厚度(m) | Ro (%) | 孔隙度 (%) | TOC (%) | 硅质含量(%) | 碳酸质 含量(%) | 含气性 (m3/t) | 地层压力系数 | 水平 地应力差 |
---|---|---|---|---|---|---|---|---|---|---|
焦石坝 | 3 880~4 011 | 30.5~49.5 | 2.42~2.80 | 3.12~3.33 | 2.84~2.93 | 47.7~69.2 | 10.1~12.3 | 3.33~4.52 | 1.38~1.57 | 7.4~14.0 |
丁山 | 3 936~4 269 | 39.0~35.0 | 1.85~2.23 | 3.77~4.60 | 2.85~3.72 | 41.1~52.3 | 11.0~15.2 | 5.06~6.15 | 1.25~1.70 | 13.0~24.0 |
南川 | 4 382~4 411 | 29.0 | 2.53 | 4.12 | 3.17 | 46.2 | 9.7 | 4.10 | 1.52 | 22.0 |
东溪 | 4 197~4 227 | 30.5 | 4.60 | 3.49 | 52.3 | 11.0 | 5.06 | 1.40~1.65 | 17.0 | |
Eagle Ford | 1 200~4 200 | 20.0~90.0 | 0.60~1.80 | 4.50 (3.00~7.00) | 4.50 (3.00~7.00) | 14.0~35.0 | 20.0~50.0 | 6.00 | 1.35~1.80 | 4.0 |
Haynesville | 3 658 | 45.0 | 1.20~3.00 | 10.00 (8.00~12.00) | 4.00 (3.00~5.00) | 15.0~20.0 | 40.0~90.0 | 12.00 | 1.90 | <10.0 |
Cana Woodford | 4 115 | 50.0 | 6.50 (5.00~8.00) | 9.00 (6.00~12.00) | 48.0~74.0 | <20.0 | 1.58 | 5.7 |
Table 3
Current situation of fracturing equipment in China and abroad (According to references [33-35])"
工艺技术 | 国外 | 国内 |
---|---|---|
压裂装备 | ①压裂装备主要为2 300 hp以下拖装柴驱 ②多采用拖装双泵结构,整机功率5 000~7 000 hp | ①国内压裂装备以柴驱为主,已经开发了3000—7000型电动压裂设备 ②压裂装备平均负荷率在60 %以下 |
压裂地面管汇 | 以大通径法兰管线为主的拖链式或围栏式管汇结构 | 由壬式3″三通道、4″两通道结构,管线安装复杂,存在振动、超排现象 |
连续油管作业装备 | ①连续油管作业装备,2″油管长度达到8 000 m ②装备自动化、信息化水平较高,油管现场连接技术成熟 | ①现役连续油管主力装备油管容量最大为2″,长度为6 000 m, ②现场连接焊接技术可靠性和自动化水平有待提高 |
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