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Oil and gas reservoir rock mineral surface wettability measuring device and measuring method

A measurement method and technology for oil and gas reservoirs, which are applied in measurement devices, surface tension analysis, surface/boundary effects, etc., can solve the problem of inability to directly measure the surface wettability of a single mineral particle at the micron scale, and improve oil and gas recovery. , high accuracy, simple operation effect

Pending Publication Date: 2021-05-28
PEKING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] To this end, the present invention provides a device and method for measuring the surface wettability of rock minerals in oil and gas reservoirs, so as to solve the problem that existing methods for measuring the surface wettability of rocks and minerals in oil and gas reservoirs cannot measure the surface wettability of micron-sized individual mineral particles. The problem with making direct measurements

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  • Oil and gas reservoir rock mineral surface wettability measuring device and measuring method
  • Oil and gas reservoir rock mineral surface wettability measuring device and measuring method
  • Oil and gas reservoir rock mineral surface wettability measuring device and measuring method

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Embodiment 1

[0031] Such as figure 1 The device for measuring the surface wettability of oil and gas reservoir rock minerals includes a closed cavity 1 and an atomic force microscope 2, the probe 21 of the atomic force microscope 2 penetrates deep into the closed cavity 1, and the atomic force microscope 2 The probe loading device 22 is installed above the airtight chamber 1, and the computer 23 and controller 24 of the atomic force microscope 2 are arranged outside the airtight chamber 1; the airtight chamber 1 is provided with a gas inlet 11 and gas outlet 12.

[0032] Atomic Force Microscopy (AFM) is a characterization instrument for nanoscale imaging of the sample surface by detecting the force between the probe tip and the sample surface. The atomic force microscope has a variety of imaging modes, among which the tapping mode is suitable for the measurement of soft material surfaces such as cells, droplets, and bubbles. In tapping mode, the probe cantilever is forced to vibrate at a...

Embodiment 2

[0036] A method for measuring the surface wettability of oil and gas reservoir rock minerals comprises the following steps:

[0037] Step S1: Take an oil and gas reservoir core, cut it into rock slices, firstly perform mechanical polishing on the surface of the rock slice, then rinse the surface of the rock slice with deionized water, then dry the surface of the rock slice with high-purity nitrogen, and set aside.

[0038]Step S2: Gently drop a drop of water on the surface of the rock slice with a capillary tube, the water forms a droplet with a diameter of about 2 mm on the surface of the rock slice, and then put the rock slice together with the water drop into the closed cavity; the closed cavity A certain amount of water droplets were originally placed at the bottom of the rock slices, so as to prevent all the water droplets on the surface of the rock slices from volatilizing.

[0039] Step S3: Introduce high-purity nitrogen gas into the closed cavity for 1 minute to drive ...

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Abstract

The invention discloses an oil and gas reservoir rock mineral surface wettability measuring device and measuring method, and relates to the technical field of oil and gas development, the device comprises a closed cavity and an atomic force microscope, and a probe of the atomic force microscope goes deep into the closed cavity; and a gas inlet and a gas outlet are formed in the closed cavity. The measuring device comprises the closed cavity, the to-be-detected sample is placed in the closed cavity to be measured, the influence of external environment factors on the measuring result is avoided, meanwhile, the atomic force microscope is adopted for accurately scanning the surface of rock minerals of an oil and gas reservoir dripped with liquid drops, the contact angle of the liquid drop on the surface of the mineral particle is accurately calculated through the formed three-dimensional morphology graph of the liquid drops, and the aim of directly measuring the wettability of the surface of the micron-sized single mineral particle can be achieved. The measuring method is easy to operate, and the measuring result is high in accuracy.

Description

technical field [0001] The invention relates to the technical field of oil and gas development, in particular to a device and a method for measuring the surface wettability of rock minerals in oil and gas reservoirs. Background technique [0002] Wettability is an important reservoir rock characteristic that needs to be considered in oil and gas development. It can significantly affect the distribution and migration of fluids (oil, gas, water, etc.) in reservoir pores, so it is a key factor determining oil and gas recovery. . In order to enhance oil recovery, it is usually necessary to evaluate the wettability of the reservoir first. In previous studies, the reservoir rock was generally evaluated as a whole. With the increasing application of tertiary oil recovery technology in petroleum development, especially when wettability modification of reservoirs is required, it is necessary to conduct systematic and in-depth research on the wettability of reservoir constituent min...

Claims

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Application Information

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IPC IPC(8): G01N13/00G01N13/02
CPCG01N13/00G01N13/02G01N2013/0208
Inventor 邓亚骏饶诗杭李臻超卢海龙
Owner PEKING UNIV