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Method for improving recovery ratio of normal heavy oil reservoirs in water-flooding development

A technology for heavy oil reservoirs and recovery factors, which is applied in the fields of fluid production, earth-moving drilling, wellbore/well components, etc. The problem of high viscosity of the movable gel system can reduce the permeability of water phase, expand the swept volume of water flooding, and improve oil recovery.

Active Publication Date: 2012-07-11
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the process of realizing the present invention, the inventors have found that the prior art has at least the following problems: mine field test shortcomings: the first is that the movable gel control and flooding technology uses polymers and cross-linking agents to be injected into the ground in a certain order, so that the two Underground cross-linking is used to seal off high aquifers. Because the system requires underground cross-linking, the reliability and controllability of gelation is poor. There is a phenomenon that the system does not form gelation underground, which greatly affects the effect of enhanced oil recovery; the second is The viscosity of the injected movable gel system is too high, it is difficult to advance to the depth of the reservoir to achieve the purpose of diverting the deep reservoir fluid flow, the treatment radius is too small, and the range of enhanced recovery is limited

Method used

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  • Method for improving recovery ratio of normal heavy oil reservoirs in water-flooding development
  • Method for improving recovery ratio of normal heavy oil reservoirs in water-flooding development

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1: Core flooding experiment of composite microgel control and flooding system with non-uniform man-made sand-packed pipe

[0037] Experimental conditions:

[0038] Parallel cores with non-average man-made sand-fill pipes: the permeability is 3370md and 480md respectively.

[0039] Experimental oil: degassed and dehydrated crude oil taken from Block 1 of Liaohe Oilfield, with a viscosity of 75.0 mPa s at 70°C.

[0040] Experimental water: simulated water taken from the sewage of Liaohe Oilfield Hai 4 station for liquid preparation, with a salinity of 2286.5mg / L

[0041] Composite flood control agent: 1000mg / l movable microgel (produced by Beijing Shida Wanjia Energy and Environmental Technology Co., Ltd.), 3000mg / l sodium dodecylbenzenesulfonate surfactant (ORS series of products) mixed compound system.

[0042] Experimental temperature: 70°C

[0043] Experimental steps:

[0044] (1) Evacuate the physical model for 4-5 hours, then saturate the simulated form...

Embodiment 2

[0053]Example 2: Core flooding experiment of composite microgel control and flooding system with non-uniform man-made sand-packed pipe

[0054] Experimental conditions:

[0055] Parallel cores with non-average man-made sand-fill pipes: the permeability is 2810md and 510md respectively.

[0056] Experimental oil: degassed and dehydrated crude oil taken from Block 1 of Liaohe Oilfield, with a viscosity of 75.0 mPa s at 70°C.

[0057] Experimental water: simulated water taken from the sewage of Liaohe Oilfield Hai 4 station for liquid preparation, with a salinity of 2286.5mg / L

[0058] Composite flood control agent: 1000mg / l movable microgel (produced by Beijing Shida Wanjia Energy and Environmental Technology Co., Ltd.), 3000mg / l ammonium dodecylbenzenesulfonate surfactant (ORS series of products) mixed compound system.

[0059] Experimental temperature: 70°C

[0060] Experimental steps:

[0061] (1) Evacuate the physical model for 4-5 hours, then saturate the simulated for...

Embodiment 3

[0070] Example 3: Field Implementation of Composite Microgel Control and Flood System

[0071] (1) First, the submillimeter-scale movable microgel is pumped into the water injection pipeline through a well pump, and configured as a pre-blocking slug with a concentration of 1000 mg / l, and the injection volume is 0.08 times the pore volume of the oil layer.

[0072] (2) Then mix the micron-scale movable microgel and surfactant according to the ratio of 4:1, pump it into the water injection pipeline through the well pump, and configure it as a main slug for regulating and driving with a concentration of 2000mg / l, and the injection volume is 0.1 times Oil layer pore volume.

[0073] (3) Finally, the submillimeter-scale movable microgel is pumped into the water injection pipeline through the well pump, configured as a post-sealing slug with a concentration of 1000 mg / l, and the injection volume is 0.02 times the pore volume of the oil layer.

[0074] The microgel in this embodimen...

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Abstract

The invention discloses a method for improving the recovery ratio of normal heavy oil reservoirs in water-flooding development, comprising the steps of (1) preparing microgel and water to be 1000-3000mg / l of solution; (2), preparing surfactants and water to be 2000-3000mg / l of solution; and (3), filling a microgel solution slug and a surfactant solution slug from a water well, wherein the microgel is copolymer of acrylic amide and methylene diacrylamide; the surfactant is alkylbenzene sulfonate surfactant. In the invention, based on the characteristic of strong anisotropy of the water-flooding developed reservoirs, the method fully uses a movable microgel profile control action mechanism and a surfactant oil-displacing action mechanism in a composite system through a filled composite microgel profile control system, so that the method can improve the anisotropy in reservoir stratums and among reservoir stratums, solve a fingering condition, increase water-displacing waves and volumes and improve the displacement efficiency, thereby drastically improving the oil recovery; indoor core tests show that the total recovery ratio is up to 80-90%.

Description

technical field [0001] The invention belongs to the field of oil recovery, in particular to a method for improving the recovery rate of common heavy oil reservoirs developed by water flooding. Background technique [0002] In common heavy oil reservoirs developed by water flooding, due to the ubiquitous characteristics of strong intralayer and interlayer heterogeneity and high oil-water viscosity ratio, there are serious tongue and finger phenomena in the water injection development of the reservoir. When the oilfield enters the later stage of development, tongue and finger phenomena become more obvious, which seriously affects the improvement of crude oil recovery. [0003] Many experts have been working hard to discuss how to improve the development effect of this type of oil reservoir and increase the recoverable reserves. Du Yuhong et al. (Du Yuhong, Wu Xingcai, Chen Hong, Zeng Qingqiao, Application of Movable Gel Control and Displacement Technology in Common Heavy Oil ...

Claims

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Application Information

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IPC IPC(8): E21B43/20E21B43/22
Inventor 田鑫韩树柏刘广东汪小平刘兵唐纪云井峰王希芹杨开顾宏刘二平
Owner PETROCHINA CO LTD
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