Volume 41 Issue 3
Jun.  2024
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BAI Hao, ZHOU Fujian, WU Junlin, et al.In-situ displacement of crude oil by fracturing fluid in Chang-6 reservoir in Xingzichuan[J]. Drilling Fluid & Completion Fluid，2024, 41（3）：396-404 doi: 10.12358/j.issn.1001-5620.2024.03.016
Citation: BAI Hao, ZHOU Fujian, WU Junlin, et al.In-situ displacement of crude oil by fracturing fluid in Chang-6 reservoir in Xingzichuan[J]. Drilling Fluid & Completion Fluid，2024, 41（3）：396-404 doi: 10.12358/j.issn.1001-5620.2024.03.016
shu

In-Situ Displacement of Crude Oil by Fracturing Fluid in Chang-6 Reservoir in Xingzichuan

doi: 10.12358/j.issn.1001-5620.2024.03.016

  • National Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum, Beijing 102249

  • Received Date: 2024-01-05
  • Rev Recd Date: 2024-02-10
  • Publish Date: 2024-06-30
    Abstract
  • The Chang-6 reservoir in the Yanchang formation in Xingzichuan area is characteristic of low oil saturation, strong oil wetting and strong heterogeneity (permeability = 0.10 – 1.0 mD). In fracturing operations in this area, it was found that the conventional fracturing fluids have weak wettability alteration ability and poor imbibition displacement effect. To efficiently develop this reservoir, it is imperative to use a fracturing fluid with the ability of production enhancement by imbibition. Using NMR T2 spectrum, chemicals of different compositions were tested for their ability to produce the crude oils stored in the micrometer-nanometer sized pores in the Chang-6 reservoir, and the factors affecting fracturing fluids’ in-situ displacement of crude oil as well as the imbibition mechanism of the in-situ displacement are investigated. The results of the study show that compared with other agents, AX-2, a negatively charged ionic surfactant agent, is more suitable for producing the low oil saturation Chang-6 reservoir. Using 0.10% of AX-2, the imbibition recovery of oil is greater than 30%, and the percent oil produced from the small nanometer-sized pores is 42.08%, while that from the large micrometer-sized pores is 22.62%. If AX-2 is used to formulate a 10-nanometer nanoemulsion AX-1, it has stronger anti-adsorption ability and better performance in producing the oil from the Chang-6 reservoir; the percent oil produced from the nanometer pores is increased to 58.26%, while that from the micrometer pores is increased to 29.7%. An AX-1 emulsion with surface tension of 1.5 mN/m is the best emulsion for producing the Chang-6 reservoir, since this emulsion has higher imbibition force and crude oil stripping capacity. The fracturing fluid optimized with the AX-1 emulsion is used in field fracturing operations, and good results were obtained, the average daily production rate of crude oil reached 26 tons.

     

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