Measurement method for 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 operability is strong.

Active Publication Date: 2019-04-02
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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  • Measurement method for oil-water two-phase interference pressure gradient
  • Measurement method for oil-water two-phase interference pressure gradient
  • Measurement method for oil-water two-phase interference pressure gradient

Examples

Experimental program
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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 measurement method for an oil-water two-phase interference pressure gradient. The method comprises the following steps that: a1: obtaining the pore structure model of porous media; a2: importing the pore structure model into phase field simulation software, and setting phase field simulation basic parameters to obtain a phase field model of the porous media; a3: in the phase field model, setting the outlet end pressure and the inlet end pressure of the pore structure model, carrying out phase field simulation on the phase field model, and obtaining the oil-water two-phase interference pressure gradient under given water saturation; and a4: changing the inlet end pressure of the pore structure model, and repeating the step a3 to obtain the oil-water two-phase interference pressure gradient under different water saturations. The measurement method disclosed by the invention is convenient, effective and high in operability, can truly reflect the permeability rule of two-phase fluid in the porous media and can provide technical support for the accurate prediction of oil deposit development dynamics and the design of a development and regulation scheme.

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 Applications(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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