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Simulation method for carbon dioxide flooding simulation experiment of planar five-point well pattern in low permeability oilfield

A technology of carbon dioxide and simulation method, which is applied in the direction of earthwork drilling and production, wellbore/well components, etc., and can solve the problems that the simulation method is not suitable for carbon dioxide flooding simulation in low permeability oilfields

Active Publication Date: 2016-12-07
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

[0007] In order to solve the technical problem that the existing simulation method is not suitable for the simulation of carbon dioxide flooding in low-permeability oilfields, the inventors provide a simulation method for simulation experiments of carbon dioxide flooding in low-permeability oilfields with plane five-point well pattern

Method used

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  • Simulation method for carbon dioxide flooding simulation experiment of planar five-point well pattern in low permeability oilfield
  • Simulation method for carbon dioxide flooding simulation experiment of planar five-point well pattern in low permeability oilfield
  • Simulation method for carbon dioxide flooding simulation experiment of planar five-point well pattern in low permeability oilfield

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Effect test

Embodiment 1

[0070] It is a simulation experiment method of carbon dioxide constant pressure flooding with planar five-point well pattern in homogeneous low-permeability oil fields, including the following steps:

[0071] Step 1: Select a core and drill five blind holes on the surface of the core corresponding to the five through holes 12 on the holder 10 for planar five-point well pattern simulation; specifically, it includes:

[0072] 1.1. Choose natural core or artificial core, sand the core with sandpaper or electric saw to ensure that the surface of the core is flat, and the size is moderate, and it can be loaded into the holder.

[0073] 1.2. Coat the surface of the core uniformly with a thickness of about 0.2-0.4mm, and then place it in an oven to dry the coating. The recommended coating method in this method is to use a doctor blade along a single direction to apply the resin on the core surface side by side. Shave well.

[0074] 1.3. Drilling is performed on the upper surface of the core,...

Embodiment 2

[0098] It is a simulation experiment method of flat five-point well pattern carbon dioxide constant flow displacement in homogeneous low-permeability oil fields, including the following steps:

[0099] Step 1: Select a core and drill five blind holes on the surface of the core that correspond to the five through holes (12) on the holder (10) for the above-mentioned planar five-point well pattern simulation;

[0100] Step 2: Load the core into the holder (10) for the above-mentioned planar five-point well pattern simulation;

[0101] Step 3: Inject water and crude oil into the core in the holder (10) for simulation of the planar five-point well pattern simulation to establish the irreducible water saturation;

[0102] Step 4: Inject fluid into the holder for simulation of the planar five-point well pattern through the above-mentioned gas injection device (31), and collect and measure experimental parameters through the above-mentioned produced fluid collection and calibration equipment ...

Embodiment 3

[0107] It is a simulation experiment method of carbon dioxide constant pressure flooding with planar five-point well pattern in fractured low-permeability oil fields, including the following steps:

[0108] Step 1: Select a core and drill five blind holes on the surface of the core that correspond to the five through holes (12) on the holder (10) for the above-mentioned planar five-point well pattern simulation;

[0109] Step 2: Load the core into the holder (10) for the above-mentioned planar five-point well pattern simulation;

[0110] Step 3: Inject water and crude oil into the core in the holder (10) for simulation of the planar five-point well pattern simulation to establish the irreducible water saturation;

[0111] The details of the above three steps are the same as steps 1 to 3 in Embodiment 1, and will not be repeated, except that step 4 is different. The following describes step 4 in this embodiment.

[0112] Step 4: Inject fluid into the holder for simulation of the planar f...

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Abstract

The present invention provides a low-permeability oil field planar five-point well pattern carbon dioxide flooding simulation experiment simulation method, comprising the following steps: 1: selecting a rock core and drilling on the surface of the rock core with a holder for planar five-point well pattern simulation ( 10) the five blind holes corresponding to the five through holes (12) on the top; two: put the core into the holder (10) for well pattern simulation of the plane five-point method; three: the plane five-point method Sequentially inject water and crude oil into the holder (10) for well pattern simulation to establish irreducible water saturation; 4: Inject carbon dioxide into the holder (10) for planar five-point well pattern simulation through the gas injection device (31) , collect and measure experimental parameters through the produced fluid collection and calibration equipment (21). This method can simulate the displacement dynamics of the one-injection, four-production, five-point well pattern, simulate the channeling between wells with fractures, and avoid the phenomenon of excessive starting pressure gradient of one-way flow, so as to be closer to the real situation.

Description

Technical field [0001] The invention relates to the technical field of petroleum exploitation experiments, in particular to a carbon dioxide flooding simulation experiment simulation method of a low-permeability oil field plane five-point method well pattern. Background technique [0002] Due to the small pore throat, the large specific surface area and the thickness of the crude oil boundary layer, the strong Jiamin effect and surface molecular forces in low permeability oil fields, the seepage law does not follow Darcy's law and has non-Darcy seepage characteristics. Low-permeability oil fields have poor reservoir connectivity and high seepage resistance. Generally, the edge and bottom waters are not active, and the elastic energy is small. Under the conditions of natural energy consumption, the formation pressure drops significantly and the oil field production declines sharply. [0003] At present, the existing physical simulation methods are mainly linear displacement model si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00
Inventor 侯吉瑞王凤刚唐永强赵凤兰刘中春
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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