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Multi-block equal-fluidity energy-gathering parallel synchronous oil displacement method for heterogeneous oil reservoir

An oil displacement method and equal fluidity technology, which is applied in the direction of production fluid, earthwork drilling and production, wellbore/well components, etc., can solve problems such as ineffective water circulation, and achieve low driving resistance, small amount of displacing agent, and displacement high efficiency effect

Active Publication Date: 2006-09-06
DAQING OILFIELD CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the minimum water content time of the above-mentioned processes is not more than 0.4 times the void volume, and there are still a large number of invalid water circulation phenomena

Method used

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  • Multi-block equal-fluidity energy-gathering parallel synchronous oil displacement method for heterogeneous oil reservoir
  • Multi-block equal-fluidity energy-gathering parallel synchronous oil displacement method for heterogeneous oil reservoir
  • Multi-block equal-fluidity energy-gathering parallel synchronous oil displacement method for heterogeneous oil reservoir

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1: numerical simulation

[0042] (1) Reservoir model

[0043] The depth of the top of the reservoir is 1000m, and the thickness of the oil layer is 6m, with a positive rhythm distribution. Reservoir temperature is 45°C, underground crude oil viscosity is 8×10 -3 Pa.s. Original oil-gas ratio: 50, original oil saturation 80%, residual oil saturation 20%, bound water saturation 20%. The original formation pressure is 10Mpa, and the bubble point pressure is 8Mpa. See Table 2 for the distribution status of oil layers.

[0044] thickness

(m)

Penetration

(×10 -3 um 2 )

Porosity

upper level

2

100

0.24

Middle

2

700

0.28

lower level

2

2200

0.34

[0045] (2) Fluid data

[0046] The specific gravity of water is 1, and the underground viscosity is 0.5×10 -3 Pa.s, oil specific gravity 0.84, rock density 1.7g / cubic centimeter.

[0047] Through labo...

Embodiment 2

[0057] Embodiment two: indoor experiment (physical simulation)

[0058] Two cuboid cores with positive rhythm distribution were prepared in the laboratory. 3×3×30cm, the high, medium and low permeability are 300, 700, 2000 mD respectively, and the thickness is equal. Under the condition of 45 degrees, the experimental brine is saturated, and then the simulated oil is saturated. The simulated oil has a viscosity of 5 mPas and is blended from crude oil and kerosene from the No. 3 Oil Production Plant in Daqing. In the experiment, the main agent of the slug is hydrolyzed polyacrylamide with a molecular weight of 2500×104. The experiment was carried out at 45 degrees. Water flooding to 98% water content first, followed by injection of two sets of slugs, each group of slugs consisting of three fluids with different viscosities, and then water flooding to 98% water content. The experiment refers to the numerical simulation and experimental conditions to select the polymer concen...

Embodiment 3

[0062] Embodiment three, field application

[0063] Ji 45 block oil-bearing area, 1.03Km 2 , geological reserves: 1.26 million tons, air permeability: 214.7×10-3μm 2 . , Interlayer permeability difference: 20.8~22.7, intralayer permeability difference: 1.6~1071 Formation temperature: 48℃. Formation water salinity: 4517mg / L, number of water injection wells: 5, number of production wells: 19, daily oil production: 45.9 tons, water cut: 84%. The slug is made of gel, and the polymer is hydrolyzed polyacrylamide, with a molecular weight of 1800×104. A combined slug (profile control slug—main slug—replacement slug) is injected, followed by water injection. The amount used is shown in Table 7:

[0064]

[0065] After the slug is injected, the oil will be increased by 40,869 tons during the effective period, the recovery rate will be increased by 6.2%, and the input-output ratio is 1:3.81.

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Abstract

The invention discloses a method for multi-section equal-fluidity energy-assembled parallel synchronous oil driving in non-uniform oil layer. First, according to the water adsorption ability, dividing the non-uniform oil layer into several sections; then selecting the fluidity of oil driving agent and keep the fluidity of each section same; uses the formula that the fluidity=oil layer filter rate / fluid viscidity to calculate the fluid viscidity of needed oil driving agent; and selecting polymers to attain the fluid in said viscidity; the sub sections in different viscidities are connected to the integrated one; at last, from high to low viscidity, filling sub sections into oil layer. The invention changes the integrated oil driving into separated oil driving, with less driving resistance; the energy-assembled section has high part pressure, and high driving pressure difference. And it can reduce ineffective water cycle, improve efficiency and reduce the consumption of driving agent.

Description

Technical field: [0001] The invention relates to the field of petroleum exploitation, in particular to an oil displacement method for heterogeneous oil layers. Background technique: [0002] Affected by the depositional environment and conditions of the reservoir, the horizontal and vertical permeability distribution of oil layers is not uniform. For example, the variation coefficient of vertical permeability in Daqing Oilfield is mostly about 0.65. In the process of water injection development, most of the injected water enters the high-permeability area, which is washed away by long-term water injection, and the heterogeneity is more serious, and the invalid circulation of injected water is serious. In order to further tap the remaining oil in the potential reservoir, the oilfield has successively carried out polymer flooding, three-component chemical flooding, foam flooding, polymer flooding + deep profile control and other oil displacement methods, and has received relat...

Claims

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Application Information

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IPC IPC(8): E21B43/16E21B43/20E21B43/22
Inventor 韩修廷盖德林唐许平杨奎杰万新德刘春天
Owner DAQING OILFIELD CO LTD
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