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Composite profile control and oil displacement extraction method for thickened oil reservoir through water injection and exploitation

A technology for heavy oil reservoirs and oil reservoirs, which is applied in the field of complex oil control and flooding in the development of heavy oil reservoirs by water injection. It can solve the problems of difficult reservoir deep plane adjustment, affecting the liquid production capacity of oil wells, and limited recovery ratios. To achieve the effect of expanding the swept volume, alleviating the contradiction of water injection development, and increasing the swept volume

Active Publication Date: 2014-07-02
PETROCHINA CO LTD
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, there are at least the following problems in the prior art: First, the injected movable gel has high viscosity and poor fluidity, and it is difficult to advance into the deep reservoir for intra-layer and plane adjustment, and the treatment radius is limited to the vicinity of the injection well to improve recovery limited range
Second, due to the high viscosity of the injected mobile gel and its strong sand-carrying ability, the sand production situation in loosely cemented heavy oil reservoirs is more serious, which significantly affects the liquid production capacity of the oil well, and in severe cases, the oil well will be forced to shut down

Method used

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  • Composite profile control and oil displacement extraction method for thickened oil reservoir through water injection and exploitation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1 Composite control and flooding system non-uniform man-made core flooding experiment

[0039] Experimental conditions:

[0040] Artificial heterogeneous parallel core model: the permeability is 2000md and 380md respectively.

[0041] Oil used in the experiment: degassed and dehydrated crude oil taken from Block 1 of Liaohe Oilfield, with a viscosity of 75.0mPa.s at 70°C.

[0042] Experimental water: simulated water from Liaohe Oilfield Hai 4 station for dosing sewage, with a salinity of 2286.5mg / L.

[0043] Composite flood control agent: a solution of partially hydrolyzed polyacrylamide (product of Beijing Hengju Chemical Group Co., Ltd.) with a concentration of 3000mg / L and an organic chromium crosslinking agent YG107 with a concentration of 1500mg / L (Shidayu Optical Technology Co., Ltd., Dongying City, Shandong Province) Company product) solutions are mixed and compounded into a polymer gel solution, and the mass ratio of the two is 1:1;

[0044]The concen...

Embodiment 2

[0057] This embodiment is an embodiment of the composite flood control agent in actual production, which includes the following steps:

[0058] (1) Mix the polymer with water to obtain a polymer solution with a concentration of 2500 mg / L and pump it into the storage tank, then mix the cross-linking agent with water to obtain a cross-linking agent solution with a concentration of 1250 mg / L and pump it into the storage tank In the tank, the mass ratio of the two is 2: 1, fully stirred and mixed to obtain a polymer gel solution, which is ready for use;

[0059] (2) Mix the micron-sized movable microgel with water to obtain a movable microgel solution with a concentration of 2000 mg / L, pump it into another storage tank, stir it fully, and set it aside;

[0060] (3) Use a water well pump to pump the polymer gel solution into the water injection well, and the injection amount is 0.01 times of the pore volume of the oil layer;

[0061] (4) Pump the movable microgel solution into the...

Embodiment 3

[0065] This embodiment provides a method for improving the recovery rate of a water flooding reservoir, which includes the following steps:

[0066] (1) When the water content of the reservoir exceeds 80%, first mix the polymer solution with a concentration of 3000mg / L and the cross-linking agent solution with a concentration of 1500mg / L (the mass ratio of the two is 1:1) The polymer gel solution is pumped into the water injection well through a water well pump, wherein the injection amount of the polymer gel solution is 0.01 times the pore volume;

[0067] (2) Then the micron-scale movable microgel solution is pumped into the water injection well through the water well pump, wherein the diameter d of the micron-scale movable microgel is 1-5 μm, and the concentration of the micron-scale movable microgel solution is 2000 mg / L, the injection volume of the micron-scale movable microgel solution is 0.19 times the pore volume of the reservoir.

[0068] The polymer used in this ex...

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Abstract

The invention relates to a composite profile control and oil displacement extraction method for a thickened oil reservoir through water injection and exploitation. The method provided by the invention comprises the following steps: preparing a polymer and water into a polymer solution with the concentration of 500-5000mg / L; preparing a cross-linking agent and water into a cross-linking agent solution with the concentration of 500-5000mg / L; mixing the polymer solution and the cross-linking agent solution according to the mass ratio of (1:1)-(10:1) to obtain a polymer gel solution; preparing a movable micro-gel and water into a movable micro-gel solution with the concentration of 1000-5000mg / L; respectively injecting the polymer gel solution and the movable micro-gel solution into a well to form an oil displacement segmentation plug, wherein the polymer is partial hydrolysis polyacrylamide; the cross-linking agent is an organic chromium cross-linking agent; and the movable micro-gel is a copolymer of acrylamide and N-N methylene bisacrylamide. The method provided by the invention can obviously improve the anisotropism in storage layers, among the layers and on planes, relieves the water injection and exploitation contradictions of the oil reservoir, solves the problems of tonguing and fingering and obviously enlarges the swept volume of a displacing solution, thereby greatly improving the recovery ratio of crude oil.

Description

technical field [0001] The invention relates to a method for oil recovery by water flooding to develop heavy oil reservoirs through compound control and flooding, and belongs to the technical field of oil recovery in oilfields. Background technique [0002] Ordinary heavy oil reservoirs developed by waterflooding generally have the characteristics of strong intralayer and interlayer heterogeneity and high oil-water viscosity ratio. Contradictions within, within, and plane are prominent, and the fault block faces the severe situation of "three highs and three difficulties": high water cut, high recovery degree, high remaining oil recovery rate, difficulty in increasing production reserves, difficulty in describing remaining oil, and difficulty in replacing potential tapping technology. The effect of conventional water injection is deteriorating day by day, and it is difficult to further improve the degree of water driving. [0003] Aiming at this recognized problem in the fi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/22
Inventor 田鑫韩树柏刘广东汪小平刘兵尉小明梁华林王希芹刘二平景峰
Owner PETROCHINA CO LTD
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