Unlock instant, AI-driven research and patent intelligence for your innovation.

Saturated core under-pressure imbibition experimental device and experimental method

An experimental device and imbibition technology, applied in the field of oil and gas reservoir development and research, can solve problems such as changing pressure conditions and measurement method errors, and achieve the effects of eliminating errors, easy operation, and accurate experimental results.

Pending Publication Date: 2022-02-18
CHINA PETROLEUM & CHEM CORP +1
View PDF3 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The porous medium used in the experiment is an artificial core slice, but the experimental process is similar to the displacement experiment, and there is a certain difference from the pressure imbibition experiment environment under the consideration of fluid pressure.
Chinese patent publication CN110174430A discloses a measuring device and method for core imbibition simulation experiments under high temperature and high pressure conditions. It places the imbibition container in a magnetic stirrer with heating function to achieve high temperature conditions, and uses a hand pump as the container. Provide the high-pressure environment required for imbibition. Every time the experiment is carried out, the core is taken out for offline nuclear magnetic scanning to obtain the law of core imbibition under high temperature and high pressure conditions. However, the operation of releasing pressure and taking core during nuclear magnetic scanning changes the pressure condition.
Chinese patent publication CN209460105U discloses a nuclear magnetic resonance-based visualized pressure core imbibition experimental device. It designs a visual imbibition experimental device. The imbibition container is made of plexiglass and is placed in the nuclear magnetic resonance monitoring instrument. Realize the simulation of the imbibition process of the core in water injection huff and puff under different pressures, monitor the microscopic oil-water distribution of the core after different water injection huff and puff times, and obtain the microscopic imbibition law, but it ignores the influence of the residual oil on the core surface during the imbibition process. Influence, the experimental core needs to be saturated with oil before placing it in the device
[0007] At present, shutting down the well for a period of time after fracturing in unconventional reservoirs is an effective means to enhance oil recovery by using imbibition oil-water replacement, and there are more and more studies on imbibition. The use is limited, and there are many errors in the measurement method, and there is currently no experimental device specially used for osmosis research.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Saturated core under-pressure imbibition experimental device and experimental method
  • Saturated core under-pressure imbibition experimental device and experimental method
  • Saturated core under-pressure imbibition experimental device and experimental method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] The liquid supply unit 1 includes: a vacuum pump 11, a vacuum pressure gauge 12, a saturated fluid piston container 13, a permeate piston container 14, a displacement pump 15, a first pipeline control valve 16, a second pipeline control valve 17, and a third pipeline control valve. A pipeline control valve 18 , a fourth pipeline control valve 19 , and a fifth pipeline control valve 20 .

[0088] Specifically, a vacuum pressure gauge 12 and a first pipeline control valve 16 are arranged on the pipeline connected to the vacuum pump 11, and the pipeline coming out of the first pipeline control valve 16 is divided into two branches, which are respectively the first pipeline and the second pipeline. Two pipelines, wherein, the first pipeline is connected with the outlet of the saturated fluid piston container 13, the third pipeline control valve 18 is arranged on the first pipeline, the second pipeline is connected with the imbibition unit 2, and the second pipeline is provid...

Embodiment 2

[0091] Said imbibtion unit 2 includes: imbibition tank 21 , imbibition tank cover 28 , nuclear magnetic resonance instrument 23 , ultrasonic transducer 24 , test core 22 , sixth pipeline control valve 26 , and seventh pipeline control valve 27 .

[0092] Said siphon tank 21 is a cylindrical structure with one end open and one end closed. Threads are provided on the outer wall of its open end, and the inner wall of said siphon tank cover 28 is provided with threads. The connection is sealed by thread and rubber ring. Preferably, the siphon tank and the cover of the siphon tank are made of special high-strength ceramic (non-metallic) materials, which can avoid the interference of ferromagnetic metal materials on nuclear magnetic signals.

[0093] A vacuum hole, a metering hole and a pressure measuring hole are opened on the cover 28 of the osmosis tank, and the three holes are all communicated with the inner cavity of the osmosis tank, wherein the vacuum hole is connected with t...

Embodiment 3

[0100] The metering unit 3 includes: an oil-water separator 31 , a back pressure pump 32 , a back pressure gauge 33 , a back pressure valve 34 , and a vent valve 35 . The oil-water separator 31 is a transparent container with scale lines, which is used to distinguish the kerosene and deuterium aqueous solution at the outlet, and measure the volume of oil and water.

[0101] The inlet of the back pressure valve 34 is connected with the metering pipeline, the outlet of the back pressure valve 34 is connected with the inlet of the oil-water separator 31 through a pipeline, and the back pressure valve 34 is also connected with a back pressure gauge 33, Back pressure pump 32 . The outlet of the oil-water separator 31 is connected with a vent valve 35 .

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a saturated core under-pressure imbibition experimental device and experimental method, and belongs to the technical field of oil and gas reservoir development and research. The device comprises a liquid supply unit, an imbibition unit, a metering unit and a data acquisition and control unit; the liquid supply unit is used for providing saturated fluid and imbibition liquid and providing fluid pressure; the imbibition unit is used for providing an imbibition experiment environment; the metering unit is used for metering fluid and emptying the fluid; and the liquid supply unit is connected with the imbibition unit, the imbibition unit is connected with the metering unit, and the liquid supply unit, the imbibition unit and the metering unit are respectively connected with the data acquisition and control unit. According to the invention, the full-process experiment of core imbibition law research is realized, core saturation and under-pressure imbibition experiments can be carried out without changing the core pressure environment, the imbibition process of the core under different fluid pressures is simulated, and the change of oil and water in the core in the experiment process is accurately represented by using a nuclear magnetic resonance monitoring technology.

Description

technical field [0001] The invention belongs to the technical field of oil and gas reservoir development and research, and in particular relates to a saturated rock core pressure imbibition experimental device and an experimental method. Background technique [0002] Imbibition is the process in which a wetting fluid in a porous medium displaces a non-wetting fluid under the action of capillary forces. Mine field experience shows that the production of oil wells can be increased by increasing the retention of fracturing fluid without flowback immediately after fracturing, and using the oil-water displacement effect of imbibition. Field experiments have also proved that imbibition is an effective means to improve oil recovery . [0003] At present, the experimental research on imbibition is mainly based on static spontaneous imbibition, that is, the oil-bearing core is placed in the imbibition environment under normal temperature and pressure conditions, and the process of c...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G01N15/08G01N24/08
CPCG01N15/082G01N24/082
Inventor 曾星航许国庆祁尚义李秀云郭海滨王洁文
Owner CHINA PETROLEUM & CHEM CORP