摘要
煤岩裂缝复杂程度对裂缝导流能力具有显著影响,通过长期导流测试实验准确评价煤岩复杂裂缝真实导流能力能够为现场压裂方案设计和施工提供技术支持。开展煤岩水平裂缝、T型裂缝和工型裂缝的长期导流能力实验评价发现:铺砂浓度相同时,煤岩裂缝导流能力受裂缝形态复杂程度影响明显,复杂程度越高,裂缝铺砂总量越大,煤岩裂缝导流能力越强,同时在闭合压力作用下支撑剂压实作用越明显;相同闭合压力条件下,随压实时间的增加,煤岩裂缝导流能力逐渐降低,并且随着煤岩裂缝复杂程度的增加,下降幅度逐渐增加。实验结果解释了不同测试条件下煤岩裂缝复杂程度对裂缝导流能力的影响,研究成果是对现有煤岩裂缝导流能力评价研究的补充完善,对今后煤层气井压裂施工裂缝参数优化设计具有一定的借鉴意义。
The complexity of coal rock fracture has a significant influence on the fracture flow conductivity. Accurate assessment of the true diversion capability of the complex fracture of coal rock can provide technical support for the design and construction of the field fracturing program through the long term diversion test. In this paper, the experimental evaluation of the long term flow conductivity of the horizontal fracture of coal rock and the T type fracture are carried out, the results of which prove that when paved-sand content is same, coal and rock fracture conductivity is influenced by fracture complexity significantly, the more complexity, the greater total crack sanding, the stronger coal rock fracture flow capacity; also under the action of closing pressure, support agent compaction is more obvious; Under the same closing pressure, with the increase of compaction duration, the fracture conductivity of coal rock decreased gradually, and with the increase of the complexity of the coal and rock fracture, the decline range increased gradually. In this paper, the experimental results well explain the influence of different test conditions of coal and rock fracture complexity on fracture flow capacity and is an improvement for the existing research and evaluation of coal rock fracture conductivity, and is of guiding significance for CBM well fracture parameter optimization in the future.
出处
《天然气与石油》
2017年第1期94-99,共6页
Natural Gas and Oil
基金
国家自然科学基金青年基金项目(51504068)
关键词
煤岩
复杂裂缝
裂缝导流能力
支撑剂嵌入
煤层气井压裂
Coal rock
Complex fracture
Fracture diversion capacity
Proppant embedment
CBM well fracturing
