Method for measuring saturation of crude oil in formation fluid

A technology of formation fluids and measurement methods, applied in the direction of measurement devices, instruments, scientific instruments, etc.

Active Publication Date: 2021-05-28
CHINA NAT OFFSHORE OIL CORP +1
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  • Method for measuring saturation of crude oil in formation fluid
  • Method for measuring saturation of crude oil in formation fluid
  • Method for measuring saturation of crude oil in formation fluid

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[0062] Example 1

[0063] Using the calculation method for real-time monitoring of formation fluid crude oil saturation provided by this application in a well in the Bohai Sea, the conductivity difference between formation water and crude oil in this oil well is more than 10%. Embodiment 1 uses the mid-drilling oil and gas layer tester (EFDT) as the conductivity measuring device, and the device contains a piston pump, a pumping device, a suction probe and a conductivity sensor. The probe enters the conductivity measuring device, and the pumping device is used to pump the formation fluid. When pumped, only the formation fluid in the conductivity measuring device passes through the piston pump, forming a slug flow in the fluid pipeline with a constant cross-sectional area. That is, a section of crude oil and a section of formation water appear alternately in the oil-water two-phase flow. Finally, the slug flow passes through the conductivity sensor to obtain data.

[0064] fig...

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Abstract

According to the method for measuring the saturation degree of the crude oil in the formation fluid, a conductivity measuring device is used, and the conductivity measuring device comprises a fluid pipeline with an invariable cross sectional area and a pumping device. The method comprises the following steps: 1) putting the conductivity measuring device into a target stratum; (2) pumping the formation fluid, and sampling the formation fluid when the change of the conductivity is stable; (3) configuring the stratum fluid obtained through sampling into oil-water alternating slug flow, enabling the slug flow to pass through a fluid pipeline and pass through a conductivity sensor, obtaining the oil conductivity and water conductivity alternating pumping period, and obtaining the conductivity in the pumping period and the corresponding time T and data counting point i; and calculating the conductivity in the pumping period, the corresponding time T and the data counting point i to obtain the saturation of the crude oil in the formation fluid at the corresponding time.

Description

technical field [0001] This paper relates to the real-time on-line detection technology of formation fluid, especially a method for measuring the saturation of crude oil in formation fluid. Background technique [0002] Formation pressure sampling instrument (cable formation pressure sampling instrument, while drilling formation pressure sampling instrument and a series of instruments), providing formation pressure testing and formation fluid sampling and other services. Sampling service, with the help of advanced equipment such as fluid density, conductivity, viscosity sensors and downhole spectrometers, real-time judgment of the nature and type of formation fluid samples, to distinguish oil, gas, water, water-based mud filtrate and formation water, and oil-based mud filtrate And crude oil samples, predict the types of oil samples, gas samples, and water samples in advance to achieve the purpose of obtaining accurate samples. During the sampling operation, after the probe ...

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Application Information

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IPC IPC(8): G01N27/06G01N27/04
CPCG01N27/06G01N27/048
Inventor 支宏旭左有祥褚晓冬孔笋高永德吴兴方杨玉卿陈永超周明高
Owner CHINA NAT OFFSHORE OIL CORP
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