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Method for establishing initial water saturation of compact rock core under in-situ condition

A saturation and core technology, applied in the field of establishing the initial water saturation of tight cores under in-situ conditions, can solve the problem of being unable to simulate the formation process of initial water saturation, achieve consistent salinity and reduce experimental errors

Active Publication Date: 2021-07-09
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

Although this method overcomes the shortcomings of the precipitation method, the entire process of establishing the initial water saturation of the tight core is carried out at normal temperature and pressure, which cannot simulate the most realistic initial water saturation formation process under high temperature and high pressure.

Method used

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  • Method for establishing initial water saturation of compact rock core under in-situ condition
  • Method for establishing initial water saturation of compact rock core under in-situ condition
  • Method for establishing initial water saturation of compact rock core under in-situ condition

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Embodiment Construction

[0022] In order to explain the beneficial effects of the technical characteristics and purposes of the present invention more clearly, the content and characteristics of the present invention are further described in detail in conjunction with the accompanying drawings and embodiments. The specific steps are as follows:

[0023] Step 1. Pour the prepared formation water or simulated formation water into the intermediate container 7, select a tight sandstone core plunger, measure the length and diameter of the core plunger, put it into the core holder after drying, and follow the figure 1 Connect the pipeline as shown, check the airtightness, open the valves 4, 11, 14, 18 in turn, turn on the vacuum pump 20, and evacuate the pipeline and the rock core;

[0024] Step 2. Calibration figure 2 The volume of the pipeline to be calibrated: close the vacuum pump 20, valves 14, 18, open the thermostat 5, record the volume of the standard tank 10 as V k , the system pressure after equ...

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Abstract

The invention discloses a method for establishing initial water saturation of a compact rock core under an in-situ condition. Based on the formation process of the initial water saturation of the compact sandstone reservoir, the initial water saturation of the compact rock core is established by adopting a water increasing method, a valve is additionally arranged on a plunger at the outlet end of a rock core holder through pipeline volume calibration, and the valve is closed when the initial water saturation is established, and formation water or simulated formation water required for establishing the initial water saturation of the compact rock core can completely enter the rock core. By monitoring the resistivity of the rock core, formation water or simulated formation water injected into the rock core is ensured to be uniformly distributed in the rock core, and vacuumizing, porosity measurement and initial water saturation establishment are creatively combined. The invention provides a novel method for establishing the initial water saturation of the compact rock core under the in-situ condition, and a foundation is laid for the related research of the water-phase trap damage of the compact sandstone gas reservoir and the determination of the gas-water relative permeability under high temperature and high pressure.

Description

technical field [0001] The invention relates to the field of analysis of tight rock cores, in particular to a method for establishing the initial water saturation of tight rock cores under in-situ conditions. Background technique [0002] In terms of proven reserves and technical strength, tight sandstone gas reservoirs are unconventional natural gas resources with the most realistic exploration and development significance in China. However, due to the geological characteristics of tight sandstone gas reservoirs: such as low porosity and low permeability, ultra-low water saturation, and engineering characteristics: such as hydraulic fracturing providing a fast channel for water invasion, the damage of water phase traps is prominent and serious, which seriously hinders Exploration and development of tight sandstone gas reservoirs. Among them, the root cause of water trap damage is the ultra-low water saturation of the reservoir, that is, the initial water saturation of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
CPCG01N15/088G01N15/08
Inventor 游利军刘涛康毅力邵佳新李可明田键王艺钧黄恒清游华东
Owner SOUTHWEST PETROLEUM UNIV
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