Device and measuring method for hydrocarbon diffusion coefficient in rocks under high temperature and high pressure

A diffusion coefficient, high temperature and high pressure technology, applied in the fields of petroleum exploration and natural gas geological analysis, can solve the problems that cannot reflect the diffusion capacity of rock hydrocarbons well, and the balance pressure of gas injection is small

Active Publication Date: 2013-03-20
PETROCHINA CO LTD
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Problems solved by technology

[0003] At present, the determination of the diffusion coefficient of rock hydrocarbons in laboratories at home and abroad is mainly carried out under the conditions of normal temperature and normal pressure (room temperature 22°C, 0.2MPa gas injection equilibrium pressure, 3MPa confining pressure), and the existing diffusion coefficient measurement devices mostly use precision pressure gauges, etc. Controlling the balance pressure of gas injection in the diffusion chambers at both ends cannot well ensure that the balance pressure of gas injection in the diffusion chambers at both ends remains the same at all times, and it is easy t...

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  • Device and measuring method for hydrocarbon diffusion coefficient in rocks under high temperature and high pressure
  • Device and measuring method for hydrocarbon diffusion coefficient in rocks under high temperature and high pressure
  • Device and measuring method for hydrocarbon diffusion coefficient in rocks under high temperature and high pressure

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Embodiment 1

[0050] This embodiment provides a device for measuring the diffusion coefficient of hydrocarbons in rocks under high temperature and high pressure conditions, such as figure 1 As shown, the experimental equipment mainly includes rock diffusion coefficient tester 1, vacuum pump 3, confining pressure booster pump 4, methane gas source 5, N 2 Air source 6, left piston container 7, right piston container 8, left air source control valve 9, right air source control valve 10, left piston container control valve 11, right piston container control valve 12, automatic booster pump 13, vacuum pump control Valve 14, chromatographic detector 15, computer 16, oven (not marked in the figure), rock saturated water device (not marked in the figure) and pipelines, etc.;

[0051] Wherein, the rock diffusion coefficient tester 1 includes a constant temperature box 101, a high temperature and high pressure resistant core holder 102, a left diffusion chamber 103, a right diffusion chamber 104, a l...

Embodiment 2

[0064] This embodiment provides a method for determining the diffusion coefficient of hydrocarbons in rocks under high temperature and high pressure conditions, which is tested using the experimental equipment provided in Example 1. The determination method includes the following steps:

[0065] A. Make mudstone and sandstone samples from different regions into small cylinders with a diameter of 2.5cm and a length of 0.5-0.6cm, and conduct conventional porosity and permeability tests on the samples;

[0066] B. Put the above two rock samples into a drying device, and dry them at 100°C for more than 8 hours until they reach a constant weight;

[0067] C. Utilize sodium chloride, calcium chloride, magnesium chloride to prepare simulated formation water solution according to the respective formation water data of the mudstone and sandstone (the salinity degree of the formation water of the mudstone sample is about 40g / l, and the water type is calcium chloride type, Configure the ...

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Abstract

The invention provides a device and measuring method for the hydrocarbon diffusion coefficient in rocks under high temperature and high pressure. The device mainly comprises a rock diffusion coefficient tester, a vacuum pump, a confining pressure pump, hydrocarbon gas source, nitrogen (N2) gas source, a left piston container, a right piston container, an automatic pressure pump, a chromatographic detector, a computer, a drying device and a rock saturated water device and the like. According to the device and method, the consistent accurate accordance of the gas injection balance pressure in the diffusion chambers respectively arranged at two ends of a core holder can be achieved and the existence of the hydrocarbon diffusion driven by the concentration gradient not by the pressure gradient in the whole process of experiment is ensured. Meanwhile, according to the device and method, the problem of low gas injection balance pressure, relatively low experimental temperature and having difference with the actual formation condition of the gas source balance pressure control device in the measuring of normal diffusion coefficient is resolved.

Description

technical field [0001] The invention relates to an experimental equipment and a measuring method for measuring the diffusion coefficient of hydrocarbons in rocks, in particular to an experimental equipment and a measuring method for measuring the diffusing coefficients of hydrocarbons in rocks under high temperature and high pressure conditions, belonging to natural gas geology in the technical field of petroleum exploitation Analyze technical fields. Background technique [0002] Diffusion refers to a physical process in which gas molecules migrate freely from a high-concentration area through various media to a low-concentration area under the action of a concentration gradient of hydrocarbon gas to reach equilibrium. Diffusion is one of the important mechanisms of oil and gas migration. It is important for the migration, accumulation, and accumulation of oil and gas, especially natural gas (due to its small molecule, light weight, and strong activity, so it has strong dif...

Claims

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Application Information

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IPC IPC(8): G01N13/00
Inventor 李志生王晓波王东良李剑杨春霞严启团王义凤王蓉马卫
Owner PETROCHINA CO LTD
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