Measuring method of oil-water two-phase interference pressure gradient

A technology of pressure gradient and measurement method, which is applied in pressure difference measurement between multiple valves, measurement device, measurement of fluid pressure, etc. The measurement method is convenient, the experiment period is long, and the effect of solving the high precision requirements

Active Publication Date: 2021-06-25
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to propose a method for measuring the pressure gradient of oil-water two-phase interference in the field of existing oil and gas field development technology, where there are few studies on the pressure gradient of oil-water two-phase interference and there is no effective method for measuring the pressure gradient of oil-water two-phase interference

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  • Measuring method of oil-water two-phase interference pressure gradient
  • Measuring method of oil-water two-phase interference pressure gradient
  • Measuring method of oil-water two-phase interference pressure gradient

Examples

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Effect test

Embodiment 1

[0078] The following is the implementation effect of the method for measuring the oil-water two-phase interference pressure gradient of the present invention in Well A of Block 3-4, North Pavilion, West Gudao, Shengli Oilfield. There are two sets of development strata in this block. After long-term water injection development, it has entered the period of ultra-high water cut. For well A, the method provided by the invention is used to measure the interference pressure gradient of the oil-water two-phase.

[0079] a1: Obtain the pore structure model of porous media.

[0080] Typical samples were drilled from the rocks obtained by the sealed coring of the well, and the typical samples were scanned with a scanning electron microscope to obtain the following results: figure 2 As shown in the scanned picture, the length of the model is 600 μm; use AutoCAD software to convert the scanned picture into a DXF file to obtain the pore structure model of the porous medium.

[0081] a2...

Embodiment 2

[0099] Measuring method is the same as that of Example 1, and the difference is that in steps a3-b1, the water saturation S w1 Set to 0.145, the water saturation in steps a3-b2 reaches a given value S w1 =0.145, the distribution diagram of oil-water two-phase is as follows image 3 As shown, the phase field simulation is carried out on the phase field model, and the simulation results of oil phase and water phase interference pressure gradient are obtained when the water saturation is 0.145. The simulation results are shown in Table 2.

[0100] Table 2

[0101]

[0102] Table 2: Water Saturation S w1 When the value is 0.145, the oil phase and water phase interfere with the pressure gradient simulation results ("√" in the table indicates that the fluid can flow, and "×" indicates that the fluid does not flow).

[0103] It can be seen from Table 2 that when the pressure at the inlet end is 15.625Pa, neither the oil phase nor the water phase flows anymore. At this time, the...

Embodiment 3

[0107] Measuring method is the same as embodiment 1, and difference is in step a3-b1 water saturation S w1 Set to 0.291, the water saturation in steps a3-b2 reaches a given value S w1 =0.291, the distribution diagram of oil-water two-phase is as follows Figure 4 As shown, the phase field simulation is carried out on the phase field model, and the simulation results of oil phase and water phase interference pressure gradient are obtained when the water saturation is 0.291. The simulation results are shown in Table 3.

[0108] table 3

[0109]

[0110] Table 3: Water Saturation S w1 When the value is 0.291, the oil phase and water phase interfere with the pressure gradient simulation results ("√" in the table indicates that the fluid can flow, and "×" indicates that the fluid does not flow).

[0111] It can be seen from Table 3 that when the pressure at the inlet end is 11.7188Pa, both the oil phase and the water phase no longer flow, and the interference pressure gradien...

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Abstract

The invention relates to the technical field of oil and gas field development, and discloses a method for measuring the pressure gradient of oil-water two-phase interference. The method includes a1: obtaining a pore structure model of a porous medium; a2: importing the pore structure model into a phase field simulation software, And set the basic parameters of the phase field simulation to obtain the phase field model of the porous medium; a3: set the outlet end pressure and the inlet end pressure of the pore structure model in the phase field model, and carry out phase analysis on the phase field model field simulation to obtain the interference pressure gradient of the oil-water two-phase at a given water saturation; a4: change the inlet end pressure of the pore structure model and repeat step a3 to obtain the interference pressure gradient of the oil-water two-phase at different water saturations . The measurement method of the invention is convenient, effective and highly operable, can truly reflect the seepage law of the two-phase fluid in the porous medium, and can provide technical support for the accurate prediction of reservoir development dynamics and the design of development adjustment schemes.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field development, and in particular relates to a method for measuring the pressure gradient of oil-water two-phase interference. Background technique [0002] During the development of water flooding oilfields, due to the presence of oil-water two-phase fluid in the rock pores of the reservoir, the occurrence state and flow form of any one phase fluid will affect the other phase, resulting in the occurrence of both phase fluids. The flow law that is different from that of single-phase fluid is called "disturbance". For medium-high permeability reservoirs, when the fluid in the pore is single-phase, as long as there is a pressure difference between the two ends of the pore, the fluid will flow; but for oil-water two-phase flow, due to the interference of the water phase, the driving force on the crude oil at the pore wall It may not be enough to overcome the surface attraction, thus leading t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N13/00G01L13/00
CPCG01L13/00G01N13/00
Inventor 王森冯其红赵蕴昌谷建伟杨勇束青林张以根孙业恒
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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