English

In situ bubble point measurement using spectroscopy

1451
2024-01-31 14:27:22
See translation

Develop and research a new downhole bubble point pressure measurement technology suitable for black oil and volatile oil to enhance well analysis using spectroscopy.

Representative fluid characteristics are required for a wide range of oilfield lifespans, such as the initial scale and production planning of reservoir hydrocarbon reserves. Fluid characteristics are usually obtained from laboratory sample analysis, but some fluid characteristics can also be measured in situ using formation testers. A new downhole bubble point technology has been developed to supplement traditional well analysis measurements. Measure the initial pressure of bubbles on reservoir fluids for early estimation and sample representativeness.

The method outlined consists of two parts: bubble generation and bubble point pressure detection. After separating a certain volume of uncontaminated fluid in the fluid analyzer module of the formation tester, use a downhole pump to reduce the streamline pressure at a low and accurate flow rate. Use spectral measurements at a data sampling rate of 128 ms to detect bubble initiation. Even very small bubbles can scatter visible and near-infrared light passing through the pipeline, ensuring the detection of bubble formation. The streamline pressure reduction experiment can be conducted within a few minutes, at any time, on a series of well bodies.

Underground bubble point pressure measurements were conducted on four different fluids. The gas/oil ratio range for testing fluids is 90 m3/m3 to 250 m3/m3. In each case, the downhole bubble points obtained from the streamline decompression experiment match the saturation determined by constant component expansion in the laboratory, reaching within 350 kPa. Firstly, use near-infrared spectroscopy to detect the initiation of bubbles. As the pressure decreases, the size of bubbles coming out of the solution will increase, and the presence of bubbles can be recognized by other downhole sensors, such as live density and fluorescence, manifested as signal scattering. For each fluid studied, the pressure and density measurements obtained when the streamline pressure is higher than the saturation pressure are also used to calculate the compressibility of pressure changes with pressure.

This type of downhole bubble point pressure measurement can optimize real-time sampling operations, achieve fluid classification and separation research, and can be used for early elucidation of fluid state equation models. This technology is suitable for black oil and volatile oil. For heavy oil with very low gas content, the accuracy of this technology may be reduced due to the energy required to overcome nucleation barriers.

Previously recorded techniques typically infer downhole bubble points by analyzing the rate of change in streamline pressure. For the first time, it demonstrated the beginning of directly detecting the appearance of bubbles without the need for additional specialized downhole equipment, and was validated based on laboratory measurement results. The measurement accuracy was achieved by combining a 128 millisecond spectrum with a low and accurate decompression rate.

Source: Laser Net

Related Recommendations
  • Afinum Management acquires significant stakes in two laser companies

    Recently, Afinum Management, a private equity firm based in Munich, Germany, has acquired a large stake in two laser companies, with the intention of opening up new laser markets by combining the strengths of three parties.According to media reports, the two companies are ARC Laser in Germany and GNS neo Laser in Israel, and Afinum has agreed with the founders of the two companies that the acquisi...

    2024-08-08
    See translation
  • Korean researchers use laser ablation to create deformable micro supercapacitors

    Recently, a research team from the Korea Institute of Industrial Technology and POSTECH University successfully utilized laser sintering pattern technology to create a deformable micro supercapacitor (MSCs), specifically designed to provide energy storage solutions for soft electronic devices. This breakthrough meets the urgent need for efficient energy storage systems in stretchable devices in...

    2024-05-30
    See translation
  • Shanghai Optics and Machinery Institute has made progress in the development of picosecond reflectors based on composite materials

    Recently, the High Power Laser Element Technology and Engineering Department of the Shanghai Institute of Optics and Mechanics, Chinese Academy of Sciences, has made progress in the research of picosecond reflectors based on composite materials. The relevant research results are titled "Hybrid material based mirror coatings for picosecond laser applications" and published in Optics and Laser Techn...

    2024-06-12
    See translation
  • The Key Role of Laser Pointing Stability in the Application of Lithography Systems

    Lithography is one of the core processes in semiconductor manufacturing, and extreme ultraviolet lithography technology, as a new generation lithography technology, is also in a rapid development stage. The basic principle is to use photoresist (also known as photoresist) to form corrosion resistance due to photochemical reactions after being photosensitive, and to engrave the patterns on the mask...

    2024-07-02
    See translation
  • The research team developed additive manufacturing (AM) technology based on hydrogel injection, and related research was published on Nano Letters

    It is reported that the research team of California Institute of Technology has developed an additive manufacturing (AM) technology based on hydrogel injection, which uses two-photon lithography technology to produce 3D metal with a characteristic resolution of about 100 nm.The relevant research is published in the journal Nano Letters, titled 'Suppressed Size Effect in Nanopillars with Hierarchy ...

    2023-09-25
    See translation