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Simulation experimental analog method for low permeability oilfield planar five-spot well pattern carbon dioxide flooding

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: 2014-02-05
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Description
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  • Application Information

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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 experimental analog method for low permeability oilfield planar five-spot well pattern carbon dioxide flooding
  • Simulation experimental analog method for low permeability oilfield planar five-spot well pattern carbon dioxide flooding
  • Simulation experimental analog method for low permeability oilfield planar five-spot well pattern carbon dioxide flooding

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Embodiment 1

[0070] It is a simulation experiment method for carbon dioxide constant pressure flooding in a plane five-point well pattern in a homogeneous low-permeability oilfield, including the following steps:

[0071] Step 1: Select a rock core and drill five blind holes corresponding to the five through holes 12 on the surface of the rock core with the above-mentioned plane five-point well pattern simulation holder 10; specifically, include:

[0072] 1.1. Select a natural core or an artificial core, and polish the core with sandpaper or an electric saw to ensure that the surface of the core is flat and the size is moderate enough to fit into the holder.

[0073] 1.2. Uniformly coat a coating with a thickness of about 0.2-0.4mm on the surface of the core, and then dry the coating in an oven. The recommended coating method for this method is to use a scraper to apply the resin on the core surface one by one along a single direction. Scrape evenly.

[0074] 1.3. Drilling on the upper su...

Embodiment 2

[0098] It is a simulation experiment method for constant flow rate of carbon dioxide flooding in a planar five-point well pattern in a homogeneous low-permeability oilfield, including the following steps:

[0099] 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 above-mentioned planar five-point well pattern simulation holder (10);

[0100] Step 2: Put the rock core into the above-mentioned holder (10) for plane five-point method well pattern simulation;

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

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

Embodiment 3

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

[0108] 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 above-mentioned planar five-point well pattern simulation holder (10);

[0109] Step 2: Put the rock core into the above-mentioned holder (10) for plane five-point method well pattern simulation;

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

[0111] The details of the above three steps are the same as the steps 1 to 3 in the embodiment 1, and will not be repeated, only the step 4 is different, and the step 4 in this embodiment will be introduced below.

[0112] Step 4: Inject fluid into the holder for plane ...

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Abstract

The invention provides a simulation experimental analog method for low permeability oilfield planar five-spot well pattern carbon dioxide flooding, which comprises the following steps: I. choosing a core and drilling five blind holes corresponding to five through holes (12) in a planar five-spot well pattern simulation holder (10) in the surface of the core; II. placing the core into the planar five-spot well pattern simulation holder (10); III. injecting water and raw oil into the planar five-spot well pattern simulation holder (10) in sequence, and establishing the irreducible water saturation; IV. injecting carbon dioxide into the planar five-spot well pattern simulation holder (10) by using a gas injecting device (31), and collecting and measuring experimental parameters through produced fluid collection and calibration equipment (21). The method can be used for simulating the displacement performance of a one-injection and four-production five-spot well pattern, and simulating the interwell fluid channeling with cracks so as to avoid the phenomenon of the overlarge starting pressure gradient of one-way flow, so that simulation is more proximate to a real situation.

Description

technical field [0001] The invention relates to the technical field of oil exploitation experiments, in particular to a simulation method for carbon dioxide flooding simulation experiments of planar five-point well patterns in low-permeability oilfields. Background technique [0002] Due to the small pore throats, large specific surface area and crude oil boundary layer thickness, strong Jiamin effect and surface molecular force in low-permeability oilfields, the seepage law does not follow Darcy's law, and has non-Darcy-type seepage characteristics. The reservoirs in low-permeability oilfields have poor connectivity and high seepage resistance. Generally, the edge and bottom water are not active, and the elastic energy is very small. Under the conditions of mining with natural energy consumption, the formation pressure drops sharply, and the oilfield production declines sharply. [0003] At present, the existing physical simulation methods are mainly linear displacement mod...

Claims

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Application Information

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Patent Type & Authority Applications(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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