Special Oil & Gas Reservoirs >

2022 , Vol. 29 >Issue 5: 166 - 174

DOI: https://doi.org/10.3969/j.issn.1006-6535.2022.05.024

Drilling & Production Engineering

Sensitivity Evaluation of Ultra-low Permeability Sandstone Reservoir and Development of Acidizing Stimulation Fluid

  • Zhang Jinfa ,
  • Li Ting ,
  • Wu Jingyu ,
  • Guan Yingzhu ,
  • Xu Mo ,
  • Dan Zhihua ,
  • Zhou Mingxiu
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  • 1. Yangtze University, Wuhan, Hubei 430100, China;
    2. Hubei Provincial Key Laboratory of Oil and Gas Drilling and Production Engineering, Wuhan, Hubei 430100, China;
    3. PetroChina Xinjiang Oilfield Company, Karamay, Xinjiang 834000, China;
    4. PetroChina Tuha Oilfield Company, Hami, Xinjiang 839000, China

Received date: 2022-04-06

  Revised date: 2022-07-29

  Online published: 2023-01-10

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Abstract

Acidizing is an important stimulation measure for ultra-low permeability sandstone reservoirs. If the acid fluid system is not used properly, it will cause sensitive damage to the reservoir. To this end, taking the sandstone reservoir of Sanjianfang Formation in Shanshan Oilfield, Turpan-Hami Basin as an example, the characteristics of reservoir sensitivity and damage mechanism were studied by means of XRD diffraction analysis, scanning electron microscope, reservoir sensitivity evaluation experiment and field data collation, and an acidizing stimulation fluid was developed, which could be used in combination with mud acid to improve the acidizing effect. The research shows: The rock types of the Sanjianfang Formation reservoirs are mainly feldspar lithic sandstone, and the clay minerals are mainly kaolinite and montmorillonite, which belong to high clay mineral reservoirs. The reservoir physical properties as a whole show the characteristics of low porosity and extra-low permeability, the crude oil is light crude oil, and the reservoir is unsaturated reservoir with normal formation pressure. The reservoir has moderate to weak velocity-sensitive, alkali-sensitive, water-sensitive, salinity-sensitive, and weak acid-sensitive properties. The combined acid fluid system of stimulation fluid and soil acid can dissolve pores of various scales such as macropores and micropores to form a pore network system, which can increase the permeability of the target reservoir core to a maximum of 2.68 times the original permeability. The field application effect is remarkable. Compared with that before acidizing, the average daily oil production of a single well increases by 1.29 t/d. The research results can provide technical support for acidizing stimulation of ultra-low permeability sandstone reservoirs.

Key words： acidizing; ultra-low permeability reservoir; reservoir sensitivity; Shanshan Oilfield; Turpan-Hami Basin

Cite this article

Zhang Jinfa , Li Ting , Wu Jingyu , Guan Yingzhu , Xu Mo , Dan Zhihua , Zhou Mingxiu . Sensitivity Evaluation of Ultra-low Permeability Sandstone Reservoir and Development of Acidizing Stimulation Fluid[J]. Special Oil & Gas Reservoirs, 2022 , 29(5) : 166 -174 . DOI: 10.3969/j.issn.1006-6535.2022.05.024

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