定北区块致密气储层水平井压裂参数优化

Horizontal well fracturing parameter optimization for the tight gas reservoir in Dingbei Block

张汝生 李克智 黄志文

ZHANG Rusheng LI Kezhi HUANG Zhiwen

中国石化石油勘探开发研究院 中国石化海相油气藏开发重点实验室 中国石化华北分公司

Research Institute of Petroleum Exploration Development, SINOPEC, Beijing100083, China Key Laboratory of Marine Oil and Gas Reservoir Development, SINOPEC, Beijing100083, China North China Branch of SINOPEC, Zhengzhou450006, Henan, China

水平井多级分段压裂是鄂尔多斯北部定北气田致密气藏开发的有效手段。由于储层较深、物性较差，在定北区块盒1气层的前期压裂施工过程中不断出现砂堵和超压的现象，施工成功率低。为了探索前期加砂困难的原因，优化压裂设计，开展了支撑剂导流能力评价实验、支撑剂在裂缝中通过性物理实验和携砂液运移规律数值模拟等研究。实验结果表明，近井多裂缝及动态缝宽与支撑剂粒径不匹配等因素是导致施工加砂困难的主要原因。对定北盒1储层支撑剂体系、施工排量和砂比进行了优化，现场应用6口井45段，施工成功率达到97.8%，解决了定北区块盒1储层水平井压裂加砂困难的问题，提高了压裂效果，为相关致密气储层水平井的压裂工艺提供技术参考。

Horizontal well multi-stage segmental fracturing is the effective method for the development of the tight gas reservoir in Dingbei gas field in the north of Ordos.Due to deep burial of the reservoir and poor physical property, sand plug or overpressure phenomena continuously appear in the process of earlier fracturing operation in He 1 gas reservoir in Dingbei Block with low operation success ratio.In order to clarify the reason for the difficulties to add sand in the earlier stage and optimize the fracturing design, the researches on proppant flow conductivity evaluation experiment, physical experiment of the proppant passing ability in the fracture and numerical simulation of sand carrier migration rules and etc.have been developed.The experimental results show that the factors of many fractures in the reservoir, dynamic fracture width and mismatch of the proppant sizes are the main reasons for the difficulties of adding sand in the fracturing operation.Therefore, the proppant system, operational discharge capacity and sand ratio of He 1 reservoir in Dingbei block are optimized, and the field application of 6 wells and 45 well sections show that the operational success ratio reaches 97.8%.Thus, the difficult problem of adding sand in horizontal well fracturing in He 1 reservoir of Dingbei Block has been solved and the fracturing effect has been improved, which provide the technical reference to horizontal well fracturing technology for the relative tight gas reservoir.

10.13639/j.odpt.2017.02.022