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Experimental calibration method of saturation degree and water production rate logging evaluation model of water-flooded layer

A calibration method and water production rate technology, applied in the field of experimental physics testing, can solve problems such as the inability to accurately measure the resistivity of formation water that cannot be mixed, and it is difficult to establish a water-flooded oil layer.

Active Publication Date: 2013-08-07
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0003] At present, limited by the level of understanding or experimental ability, different laboratories often only carry out experimental measurements of relative permeability or resistivity of water-flooded oil formations alone, and cannot accurately measure the resistivity of mixed formation water during water-flooding, so it is difficult to establish Function or experimental statistical relationship between water production rate-saturation, water production rate-mixed formation water resistivity (salinity), resistivity-saturation of water-flooded oil layer to meet water-flooded oil layer water production rate and saturation Well logging evaluation

Method used

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  • Experimental calibration method of saturation degree and water production rate logging evaluation model of water-flooded layer
  • Experimental calibration method of saturation degree and water production rate logging evaluation model of water-flooded layer
  • Experimental calibration method of saturation degree and water production rate logging evaluation model of water-flooded layer

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Embodiment 1

[0032] Taking the core of the GD Oilfield as an example, the salinity of the original formation water in the reservoir is 3000mg / L, and the salinity of the injected water is 14000mg / L. After sampling, the experimental measurement is carried out. The specific operation steps are as follows:

[0033] 1) Measure the resistivity of the saturated water sample and record it as R 0 , the cementation index m is obtained after calculating the formation factor F according to formula (1).

[0034] F = R o R w = 1 Φ m - - - ( 1 )

[0035] 2) Flood the water-saturated sample oil to the state of irreducible water, and determine the irreducible water saturation Swi.

[0036] 3) Measure the effective permeability of the oil ...

Embodiment 2

[0048] The salinity of the original formation water in the DX oilfield reservoir is 4200mg / L, and the salinity of the injected water is 10000mg / L. The core is selected for experimental measurement. The specific operation steps are the same as in Example 1, and the experimental data processing is the same as in Example 1. Finally, the experimental statistical relationship between water content and water saturation is obtained as f w =0.4868ln(Sw)+1.0856, the coefficient is R 2 =0.96 (see Figure 7 ). R w =0.7137f w 2 -1.5902f w +1.466, the coefficient is R 2 =0.97 (see Figure 8 ). The resistivity of rock samples, resistivity of mixed formation water, water saturation and saturation index n were observed experimentally, and the saturation index n was determined to be 1.65 (see Figure 9 ).

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Abstract

The invention provides an experimental calibration method. The method comprises utilizing an unsteady relative permeability and resistivity simultaneously-measuring mode (through oil layer water-flooding process simulation) to measure the water production rate, the saturation degree, the mixed-stratum water resistivity and the rock sample resistivity during an oil layer water-flooding process; determining experimental statistical relationships and key coefficients between the water production rate and the saturation degree, the water production rate and the mixed-stratum water resistivity (the mineralization degree), and the resistivity and the saturation rate through statistical regression; and serving the logging evaluation of the water production rate and the saturation rate of a water-flooded oil layer.

Description

technical field [0001] The invention belongs to experimental physics testing technology, relates to a kind of experimental calibration method of the resistivity variation mechanism of the experimental calibration resistivity of water-flooded reservoir saturation, water production rate logging evaluation, can be directly used in oilfield water-flooded layers (fresh water flooded, salty water flooded, etc.) Quantitative evaluation of water flooding) saturation and water production rate. technical background [0002] At present, the calculation model of water production rate of water-flooded oil layer is mainly based on the relative permeability curve to establish the equation based on the shunt equation. In specific use, electrical logging is often used to calculate the water saturation of water-flooded oil layer according to the Archie formula to determine the relative permeability. After the oil layer is flooded, the general rule is: the water saturation increases, the resis...

Claims

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Application Information

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IPC IPC(8): E21B49/00
Inventor 韩学辉李峰弼
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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