Tight sandstone gas reservoir fracturing fluid damage experimental evaluation method (Chinesisch)

Freier Zugriff

The invention belongs to the field of oil-gas field development and relates to an experimental evaluation method for fracturing fluid damage in an unconventional tight sandstone oil-gas exploration and development process. The method includes: subjecting fracturing fluid to high-pressure instant reverse injection into a rock core, and simulating flow invasion damages of fracturing fluid in cracks in a continuous extension process after a stratum is fractured by the fracturing fluid; adopting a high-speed centrifuge to set up original water saturation of a reservoir; under the condition of the original water saturation of the reservoir, adopting nitrogen for testing permeability before and after injection of the fracturing fluid into the rock core, and judging fracturing fluid damage degrees according to gas log permeability change rate. By complete simulation of a fracturing fluid injection mode in a fracturing process, adoption of nitrogen for testing permeability accords with seepage characteristics of the tight sandstone gas reservoir, and defects of high experimental displacement pressure, long displacement time, large experimental data errors and the like are avoided.

本发明涉及非常规致密砂岩油气勘探和开发过程中压裂液损害的评价实验方法,属于油气田开发领域。采用压裂液高压瞬间反向注入岩心,模拟压裂液破裂地层后,裂缝继续延伸过程中压裂液在裂缝中的流动侵入损害;采用高速离心机建立储层原始含水饱和度;在储层原始含水饱和度条件下,采用氮气测试压裂液注入岩心前后渗透率,根据气测渗透率变化率判断压裂液损害程度。本发明充分模拟压裂过程中压裂液的注入方式,采用氮气测试渗透率符合致密砂岩气储层渗流特征,避免了实验驱替压力大、驱替时间长、实验数据误差大等缺点。

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Dokumentinformationen

  • Titel:
    Tight sandstone gas reservoir fracturing fluid damage experimental evaluation method
  • Weitere Titelangaben:
    致密砂岩气储层压裂液损害实验评价方法
  • Patentnummer:
    CN106153518
  • Anmeldedatum:
    2016-06-22
  • Patentanmelder:
  • Patentfamilie:
  • Autor / Urheber:
  • Verlag:
    Europäisches Patentamt
  • Erscheinungsjahr:
    2016
  • Medientyp:
    Patent
  • Format:
    Elektronische Ressource
  • Sprache:
    Chinesisch
  • Klassifikation:
    IPC:    G01N Untersuchen oder Analysieren von Stoffen durch Bestimmen ihrer chemischen oder physikalischen Eigenschaften, INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES

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