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Rock wettability measuring method under oil reservoir conditions and device thereof

A measurement method and wettability technology, applied in the field of petroleum physical property measurement, can solve the problems that the instrument does not have high temperature and high pressure test conditions, restricting the further development of research, etc.

Active Publication Date: 2012-03-28
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the analytical advantages of the self-priming suction method, it will still be an important research method for rock wettability under reservoir conditions. However, for the high-temperature and high-pressure environment of the reservoir, the existing instruments do not have high-temperature and high-pressure test conditions, which restricts the research. Further development

Method used

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  • Rock wettability measuring method under oil reservoir conditions and device thereof
  • Rock wettability measuring method under oil reservoir conditions and device thereof
  • Rock wettability measuring method under oil reservoir conditions and device thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0135] The initial pressure of the core sample and the saturated fluid is normal pressure, and the rock wettability is measured under the reservoir conditions of 5MPa and 50°C. The measurement steps are briefly described as follows:

[0136] ①Oil flooding:

[0137] a. Put the processed rock core sample into the common holder of the test oil (the holder that is commonly used in the prior art to fix the rock core sample gets final product), and keep the temperature at 50° C. for 2 hours;

[0138] b. Flood to irreducible water state with test oil.

[0139] ② Self-absorption and oil discharge:

[0140] a. Take out the core sample, remove the slick oil on the surface, and quickly put the core into the figure 2 Inside the container barrel 301 of the measuring device shown. Connect the measuring tube 303, install the end cap 302, and place the device upright (the device can also be called a water absorption meter during this experiment) and put it in a thermostat with a constant ...

Embodiment 2

[0158] The core samples are always in reservoir conditions, the oil sample is crude oil containing dissolved gas, and the bubble point pressure is 12MPa at 50°C. Taking 50°C and pressure of 20MPa as an example, briefly describe the rock wettability measurement steps:

[0159] ①Oil flooding:

[0160] a. Put the processed core sample into a common holder filled with degassed crude oil, and keep the temperature at 50°C for 2 hours;

[0161] b. Flood to irreducible water state with degassed crude oil.

[0162] ② Self-absorption and oil discharge:

[0163] a. Take out the core sample, remove the oil slick on the surface, and quickly put it into the core holding device 10 with release function (hereinafter referred to as "holding device"), put it into a one-way through-hole steel column, put it into an O-ring, and put the outer end The cover is connected with the inner end cap; the high-pressure hose end is connected with the steel column;

[0164] b. Turn the wettability measur...

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Abstract

The invention provides a core wettability measuring method under oil reservoir conditions and a device for realizing the method. The device comprises a high pressure container part and an observation part. The high pressure container part is provided with a container cylinder, the upper end of which is closed and is equipped with a measuring tube joint for communicating the space inside the container, and the lower end of which is an opening and is equipped with an end cover for sealing; the end cover is provided with a valve for injecting a fluid to be measured into the container and adjusting the pressure; and the observation part includes a measuring tube that is mounted on the measuring tube joint of the container cylinder. The measuring method consists of the steps of: placing the core saturated with a first fluid inside the high pressure container; injecting a second fluid to fill the high pressure container and the measuring tube, and controlling the temperature and pressure inside the container, with water and oil as the first and second fluid respectively; measuring a self-water adsorption and oil discharge capacity, a water-drive oil discharge capacity, a self-oil adsorption and water discharge capacity, and an oil-drive water discharge capacity of the core respectively, and calculating the core wettability. Based on a self-adsorption method and principle, the measuring method and device of the invention have sufficient theoretical bases, satisfy the high temperature and high pressure conditions of oil reservoirs, and are easy to operate.

Description

technical field [0001] The invention belongs to the technical field of petroleum physical property measurement, and in particular relates to a method for measuring rock wettability under oil reservoir conditions and a device for realizing the method. Background technique [0002] The measurement of rock wettability is the basic experiment for the measurement of petroleum physical properties. There are many measurement methods, among which the self-absorption method is a quantitative analysis method, which is most commonly used in fine experiments and research. The self-priming inhalation method uses a common wettability measuring instrument (see figure 1 ), which is mainly a glass container 4 with a measuring scale 41 at the thin end, and the rock core 20 is placed in the glass container 4 during measurement. Limited by material properties, the measuring instrument can only measure the wettability of the core in liquid under normal pressure, and cannot simulate the temperat...

Claims

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Application Information

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IPC IPC(8): G01N13/00G01N13/04
Inventor 秦积舜陈兴隆杨思玉李实史彦尧
Owner PETROCHINA CO LTD
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