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Method for testing gas-water relative permeability curve by using tight sandstone steady state method

A technology of relative permeability and tight sandstone, applied in the field of steady-state gas-water relative permeability curve determination, can solve the problems of large error and unsuitable for conventional cores, etc., and achieve high reference value, irreducible water saturation and relative permeability. Accurate and reliable curves

Active Publication Date: 2017-03-22
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it uses full-diameter cores to measure the gas-water phase permeability curve, while the experimental results of conventional cores have large errors, so it is not suitable for conventional cores.

Method used

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  • Method for testing gas-water relative permeability curve by using tight sandstone steady state method
  • Method for testing gas-water relative permeability curve by using tight sandstone steady state method
  • Method for testing gas-water relative permeability curve by using tight sandstone steady state method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Considering the influence of temperature on gas-water viscosity and the influence of overburden pressure on core water content, in order to make irreducible water saturation and relative permeability curves more accurate and reliable, and to provide high-value data for gas reservoir production evaluation, this implementation The example provides a method for measuring the gas-water relative permeability curve of tight sandstone steady-state method, which is characterized by including the following steps:

[0051] Step 1: Core preparation

[0052] Take drilling cores for processing and drying, and measure the length L, diameter d, and dry weight m of the core;

[0053] Step 2: fluid preparation

[0054] Prepare simulated formation water and take high-purity nitrogen with a purity of 99.999%. At the experimental temperature K experiment Measure the simulated formation water viscosity μ w And nitrogen viscosity μ g ;

[0055] Step 3: Vacuum the core and saturate the simulated forma...

Embodiment 2

[0134] On the basis of Example 1, it should be noted that the core processing standard in step 1 is 25mm in diameter and 60-80mm in length; the drying conditions are at 104°C for more than 6 hours. The simulated formation water described in step two is a potassium chloride solution with a molar concentration of 8%. The experimental temperature K described in step two and step four experiment Between 100°C and 120°C. The above are simulated formation conditions. Under the simulated formation water conditions, it is more in line with the actual situation in the gas reservoir production process. Using the tight sandstone steady-state gas-water phase permeability experiment device and method provided in this embodiment, not only the actual The temperature, overburden pressure and other conditions of the gas reservoir, and the measurement and calculation of irreducible water saturation are more accurate, providing accurate and high-value gas-water relative permeability curves for ga...

Embodiment 3

[0136] On the basis of Example 1, the experimental device for measuring gas-water relative permeability curve of tight sandstone steady-state method includes a core holder 1 holding a core. The inlet end of the core holder 1 is connected with two pipelines, respectively It is the gas drive pipeline 2 and the liquid injection pipeline 3, the outlet end is connected to the measurement pipeline 4, the core holder 1 is connected to the overburden pump 5 through the pipeline, and the pressure sensor 6 is installed on the pipeline; The humidifier 7, the one-way valve 8, the gas flow rate controller 9, the high pressure relief valve 10, and the nitrogen cylinder 11 are connected in series. The nitrogen cylinder 11 is installed at the end of the gas drive pipeline 2, and the humidifier 7 is located near the core clamp The position of the inlet end of the core holder 1, the inlet end of the core holder 1 is equipped with a pressure sensor two 12; the liquid injection pipeline 3 is serial...

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Abstract

The invention provides a method for testing a gas-water relative permeability curve by using a tight sandstone steady state method. The method comprises the following steps: preparing a stone core; preparing simulation stratum water; vacuuming till the simulation stratum water is saturated; connecting an experiment device and heating to experiment temperature; putting the stone core into the experiment device, pressurizing, releasing the pressure, testing the mass and the liquid phase permeability of the stone core; establishing irreducible water saturation; controlling the flowing speed of gas, and injecting the simulation stratum water at a relatively slow flowing speed, after the gas flow at an outlet is stable, increasing the flowing speed of liquid, and measuring a next point till displacement pressure meets the maximum set value and the flowing speed of the gas at the outlet is reduced to 0.1mL / minute, and terminating the experiment; according to improved phase permeability equations, calculating water saturation and relative permeability of different points. By adopting the method, two-phase permeation characteristics in the tight gas reservoir production process under stratum conditions can be simulated, the influence of the temperature on gas-water viscosity is taken into account, the influence of pressurization on the water content of the stone core is also taken into account, the irreducible water saturation and the relative permeability curve can be relatively accurate and reliable, and high-value data can be provided for gas reservoir production evaluation.

Description

Technical field [0001] The invention relates to a method for determining the gas-water relative permeability curve in a steady state method under tight sandstone formation conditions in oil and natural gas exploration and development technology. Background technique [0002] Gas-water relative permeability is an important basic data in gas field development. The current gas-water phase permeability test standard method is based on the standard SY / T5345-2007 "Method for the determination of relative permeability of two-phase fluid in rocks", which is applied under laboratory temperature conditions Compressed air or nitrogen and formation water (injected water) or standard brine are measured by steady state method or non-steady state method. [0003] The characteristics of the different methods are as follows: the non-steady-state method is faster to measure relative permeability than the steady-state method, but its data measurement, analysis and interpretation are more complex than...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08G01N1/28
CPCG01N1/28G01N15/0826
Inventor 李跃刚李进步王继平李娅万单夫王一刘平王艳薛雯路中奇杨特波
Owner PETROCHINA CO LTD
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