我国煤储层地质条件复杂，煤矿瓦斯灾害严重，煤层气井产量普遍偏低，高效抽采技术是我国煤层气行业和煤矿安全生产迫切需要解决的瓶颈技术难题。以山西大宁井田低渗低压的3号煤层为对象，研发了水平井密集多簇压裂高效开发技术，并进行了工程试验，获得了高产开发效果。结果表明：（1）试验井LDP-02所在区段煤层的平均渗透率0.112 mD，储层压力梯度3.7 kPa/m，多分支水平井平均日产量800～1 000 m³/d左右，直井平均日产362 m³/d左右，具有典型的低渗低压低产储层特征。（2）产能模拟预测表明，采用15～25 m的簇间距，经过3.85～5.95 a排采，两簇裂缝末端中间位置煤层瓦斯含量可降低至8 m³/t，满足煤矿生产要求；单段压裂可形成4簇有效裂缝，在液量1 000 m³、砂量50 m³、排量10 m³/min的条件下，单簇裂缝半长为64.1 m。（3）LDP-02井为一组U型水平井，水平井煤层段长920 m，分10段38簇压裂，每段3～4簇，簇间距11～23 m。（4）排采生产893 d，其中产气687 d，气产量长期稳定16 000 m3/d，已累计产气890×104 m³，平均日产12 955 m³/d，日产量是同区段直井的20～36倍，是同井场多分支水平井的10倍以上。工程试验结果证明，该技术突破了低渗低压储层煤层气高效开发的技术瓶颈，大幅度提高了单井产量，为煤矿区煤层气开发和瓦斯治理提供了强大技术支撑。

Coal reservoirs are geologically complex and gas-related coal mine incidents and disasters are getting worse in China. as Also,some underperformance coalbed methane (CBM) wells are widely distributed. Effective gas production rate enhancement from low permeability and low pressure CBM seams is one of the key technical challenges for the CBM industry and coal mine safety. In this study,a novel technology was developed and high gas production rate was achieved in No. 3 coal seam of Shanxi Formation in Daning coal mine,Qinshui basin,Shanxi province. The out- comes of this study include four key points. Firstly,the No. 3 coal seam is recognized as a typical low permeability and low pressure reservoir with low production in the studied coal field. Based on the observed data from six testing wells, the average permeability was estimated only 0. 112 mD,and the reservoir pressure gradient was 3. 7 kPa / m. Average gas production rate was 362 m3 / d from 120 vertical wells,and average gas production rate was only 800-1 000 m3 / d from a multi-lateral horizontal wells. Secondly,the horizontal well with multi-clusters fracturing technology was recom- mended for increasing gas production in this area. The key technical parameters were numerically optimized through a numerical modeling using COMET3. The optimized cluster spacing was found to be 15 -25 m,and four clusters in a single stage fracturing were recommended. Fractures with 64. 1 m semi-length can be effectively induced through pum- ping the well (in one stage) fluid of 1 000 m3 ,sand of 50 m3 with an injection rate 10 m3 / min. Thus,the coal seam gas content can be reduced to 8 m3 / t at the middle of two clusters fractures end after 3. 85-5. 95 years production. Thirdly,a U-shape horizontal wells named LDP-02 was completed for a pilot trail. The pilot horizontal well with total length of 1 445. 6 m connected with a directional well. The horizontal section in coal seam was 920 m and was fully cased and cemented. The hydraulic fracturing was completed for the coal seam section of 920 m with 38 clusters in 10 stages. Each stage was designed as 3-4 clusters and cluster spacing was as close as about 11-23 m. Finally,this pilot well reached a continually stable daily gas production rate as high as 16 000 m3 / d and an average of 12 955 m3 / d de- pending a drainage period of 893 days and gas production period of 687 days. The cumulative gas production was 890 ×104 m3 . This production was 20-36 folds of vertical wells and 10 times of the multiple lateral horizontal wells in the same area.