Volume 38 Issue 6
Nov.  2021
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AI Lei, GONG Chenxing, XIE Jiangfeng, et al.Application of supramolecular polymer plugging technology in changqing oilfield[J]. Drilling Fluid & Completion Fluid,2021, 38(6):705-714 doi: 10.12358/j.issn.1001-5620.2021.06.007
Citation: AI Lei, GONG Chenxing, XIE Jiangfeng, et al.Application of supramolecular polymer plugging technology in changqing oilfield[J]. Drilling Fluid & Completion Fluid,2021, 38(6):705-714 doi: 10.12358/j.issn.1001-5620.2021.06.007

Application of Supramolecular Polymer Plugging Technology in Changqing Oilfield

doi: 10.12358/j.issn.1001-5620.2021.06.007
  • Received Date: 2021-07-08
  • Publish Date: 2021-11-30
  • The Chang 7 shale oil reservoir is tight but has good fluid fluidity, which has micron-scale pores and fracture structure, leading to frequent permeable loss, fractured loss and total loss during the drilling process. Conventional plugging materials cannot meet the drilling construction requirements, resulting in a significant increase in non-production time and costs, and severely restricting the exploration and development process. Based on the theory of supramolecular chemistry, this research developed a new type of supramolecular polymer plugging material through synthesis formula optimization, and characterized and tested its microstructure, shear thinning and loss mitigation and pressure-bearing plugging ability. The research results show that the supramolecular gel plugging material not only has excellent shear thinning properties and adherence abilities, but also has a strong pressure-bearing plugging effect in large pore loss zones simulated by two-layer steel ball beds (the steel ball diameters are 8 mm ~ 10 mm) and fractured loss zones simulated by longitudinal slotted plate (the fracture widths are 2 mm~6 mm), with a pressure-bearing capacity up to 6MPa. Its application of typical total loss well in Chang 7 shale oil block shows that supramolecular gel plugging technology can effectively improve the pressure-bearing capacity of fractured loss zones reducing loss volume and comprehensive plugging costs, and helps Chang 7 shale oil exploration and development. Thus, it is worthy of further research and promotion.

     

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