阅读说明：本技术 一种非均相化学驱油体系的配比优化方法 (Proportioning optimization method of heterogeneous chemical oil displacement system ) 是由 刘煜 曹绪龙 祝仰文 潘斌林 郭兰磊 王红艳 姜祖明 陈晓彦 于群 曾胜文 于 2019-08-29 设计创作，主要内容包括：本发明涉及油田开发技术领域,涉及一种非均相化学驱油体系的配比优化方法,具体涉及非均相化学驱油体系中粘弹性颗粒驱油剂与聚合物的配比优化方法。本发明方法涉及对测定对象在不同油藏条件下配比的选择,利用建立的粘弹性颗粒驱油剂与聚合物复合体系无因次弹性模量-液流转向系数-无因次粘度关系图版,能够快速、有效的实现粘弹性颗粒驱油剂与聚合物最佳配比的优选,该方法简单实用、易于操作,为针对不同油藏条件下、发挥最佳调驱效果的非均相化学驱油体系设计提供可靠的技术支撑,从而保障非均相化学驱矿场实施。(The invention relates to the technical field of oil field development, relates to a proportioning optimization method of a heterogeneous chemical oil displacement system, and particularly relates to a proportioning optimization method of a viscoelastic particle oil displacement agent and a polymer in the heterogeneous chemical oil displacement system. The method disclosed by the invention relates to the selection of the ratio of a measured object under different oil reservoir conditions, and can quickly and effectively realize the optimal ratio optimization of the viscoelastic particle oil displacement agent and the polymer by utilizing the dimensionless elastic modulus-liquid flow turning coefficient-dimensionless viscosity relation chart of the established viscoelastic particle oil displacement agent and polymer composite system.)

1. The proportioning optimization method of the heterogeneous chemical oil displacement system is characterized by comprising the following steps of:

step 1, establishing a dimensionless elastic modulus-liquid flow turning coefficient-dimensionless viscosity relation chart of a viscoelastic particle oil displacement agent and polymer composite system;

step 2, determining a viscoelastic particle oil displacement agent according to target oil reservoir conditions, preparing a series of composite system solutions with a certain total concentration and different proportions of the viscoelastic particle oil displacement agent and a polymer, and measuring the viscosity and the elastic modulus of each composite system solution; measuring the viscosity of the polymer solution and the elastic modulus of the viscoelastic particle oil displacement agent suspension, which are the same as the total concentration of the composite system solution;

step 3, calculating the dimensionless viscosity and the dimensionless elastic modulus of the viscoelastic particle oil displacement agent-polymer composite system with different proportions;

And 4, feeding the dimensionless viscosity and the dimensionless elastic modulus of the composite system solution with different proportions to a relation chart, obtaining a liquid flow turning coefficient according to the feeding position, comparing the size of the liquid flow turning coefficient and considering the viscosity of the composite system solution, and finally determining the proportion of the viscoelastic particle oil displacement agent to the polymer.

2. the method as claimed in claim 1, wherein in step 1, the method for establishing the dimensionless elastic modulus-liquid flow turning coefficient-dimensionless viscosity relation chart of the viscoelastic particle oil displacement agent-polymer composite system comprises the following steps:

Preparing a series of composite system solutions with certain total concentration and different proportions of viscoelastic particle oil displacement agent and polymer, and measuring the viscosity eta i and the elastic modulus G' i of each composite system solution;

Measuring the viscosity eta 0 of the polymer solution with the same total concentration of the composite system solution and the elastic modulus G' 0 of the viscoelastic particle oil displacement agent suspension;

Calculating the dimensionless viscosity Y1 of the solution of the composite system, wherein Y1 is eta i/eta 0;

calculating a dimensionless elastic modulus value X1 of the composite system solution, wherein X1 is G 'i/G' 0;

adopting a split flow physical simulation test, recording the liquid production amounts of high and low permeability pipes filled with viscoelastic particle oil displacement agent-polymer composite solutions with different ratios, and calculating corresponding liquid flow diversion coefficients Qi, wherein the Qi is Hi/Li; hi is the lowest value of the flow rate of the high-permeability pipe, and Li is the highest value of the flow rate of the low-permeability pipe;

And establishing a non-dimensional elastic modulus-liquid flow diversion coefficient-non-dimensional viscosity relation chart of the viscoelastic particle oil displacement agent and polymer composite system by plotting the non-dimensional viscosity, the non-dimensional elasticity and the corresponding liquid flow diversion coefficient under different proportioning conditions according to the results of the third, the fourth and the fifth.

3. The method as claimed in claim 2, wherein the total concentration of the composite system solution is 2000-3000 mg/L.

4. The method of claim 2, wherein in step 2, the viscoelastic particle oil displacement agent and the polymer composite system solution are selected to be matched with the target oil reservoir.

5. The method as claimed in claim 1, wherein in step 4, the condition that the viscosity ratio of the composite system to the crude oil is more than or equal to 0.2 and the Q value is the minimum is the optimal ratio of the viscoelastic particle oil displacement agent to the polymer.

Technical Field

The invention relates to the technical field of oil field development, relates to a proportioning optimization method of a heterogeneous chemical oil displacement system, and particularly relates to a proportioning optimization method of a viscoelastic particle oil displacement agent and a polymer in the heterogeneous chemical oil displacement system.

Background

as the oil field gradually enters high water-containing and ultra-high water-containing periods, the difficulty of stable production gradually changes greatly, the contradiction of development gradually becomes prominent, the difficulty of exploring newly increased reserves is increased, and the cost is increased, so that the further improvement of the recovery ratio of the discovered and developed reserves becomes very urgent work. The viscoelastic particle oil displacement agent is a novel particle oil displacement agent with a unique molecular structure of partial cross-linking and partial branching, and the heterogeneous chemical oil displacement method consisting of the viscoelastic particle oil displacement agent, a polymer and a surfactant utilizes the expanding sweep capability of a compound system of the viscoelastic particle oil displacement agent and the polymer and superposes the oil washing capability brought by the ultralow interfacial tension of the surfactant, thereby providing an effective way for greatly improving the recovery ratio of a strong heterogeneous oil reservoir with high water content and high extraction degree and having profound strategic significance for the continuous and stable production of old oil fields.

Enlarging swept volume and improving oil washing efficiency are two ways to improve oil recovery ratio. In 2011, Guolanlei designs a novel viscoelastic particle oil displacement agent, surfactant and polymer chemical oil displacement system which meets the technical policy boundary and has the advantages of blocking and flooding combination and coexistence of solid phase and liquid phase, namely a heterogeneous composite oil displacement system (Guolanlei oil reservoir chemical flooding enhanced recovery technology after polymer flooding and pilot test [ J ] Daqing petroleum geology and development 2014,33(1): 122-. The viscoelastic particle oil displacement agent and the polymer are compounded, so that the heterogeneous compound flooding technology capable of further enhancing the spreading capability of a heterogeneous chemical oil displacement system is developed, and a new way for greatly improving the recovery ratio of the oil reservoir after polymer flooding is developed. The design of a heterogeneous chemical flooding system is the basis of the application of a heterogeneous chemical flooding mine, however, in the design optimization of the heterogeneous chemical flooding formula, an effective and rapid means is not available for the method for optimizing the ratio between a viscoelastic particle oil displacement agent and a polymer. Therefore, a method for optimizing the ratio between the viscoelastic particle oil displacement agent and the polymer needs to be researched, and technical guidance is provided for the design of a heterogeneous chemical oil displacement system.

Disclosure of Invention

the invention mainly aims to provide a method for optimizing the ratio of a viscoelastic particle oil displacement agent to a polymer in a heterogeneous chemical oil displacement system based on the importance of the design of the heterogeneous chemical oil displacement system under different oil reservoir conditions.

in order to achieve the purpose, the invention adopts the following technical scheme:

one of the purposes of the invention is to provide a proportioning optimization method of a heterogeneous chemical oil displacement system, which comprises the following steps:

Step 1, establishing a dimensionless elastic modulus-liquid flow turning coefficient-dimensionless viscosity relation chart of a viscoelastic particle oil displacement agent and polymer composite system;

Step 2, determining a viscoelastic particle oil displacement agent according to target oil reservoir conditions, preparing a series of composite system solutions with a certain total concentration and different proportions of the viscoelastic particle oil displacement agent and a polymer, and measuring the viscosity and the elastic modulus of each composite system solution; measuring the viscosity of the polymer solution and the elastic modulus of the viscoelastic particle oil displacement agent suspension, which are the same as the total concentration of the composite system solution;

step 3, calculating the dimensionless viscosity and the dimensionless elastic modulus of the viscoelastic particle oil displacement agent-polymer composite system with different proportions;

and 4, feeding the dimensionless viscosity and the dimensionless elastic modulus of the composite system solution with different proportions to a relation chart, obtaining a liquid flow turning coefficient according to the feeding position, comparing the size of the liquid flow turning coefficient and considering the viscosity of the composite system solution, and finally determining the proportion of the viscoelastic particle oil displacement agent to the polymer.

In the above method, preferably, in step 1, the method for establishing the dimensionless elastic modulus-liquid flow turning coefficient-dimensionless viscosity relation chart of the viscoelastic particle oil displacement agent-polymer composite system comprises the following steps:

preparing a series of composite system solutions with certain total concentration and different proportions of viscoelastic particle oil displacement agent and polymer, and measuring the viscosity eta i and the elastic modulus G' i of each composite system solution;

Measuring the viscosity eta 0 of the polymer solution with the same total concentration of the composite system solution and the elastic modulus G' 0 of the viscoelastic particle oil displacement agent suspension;

Calculating the dimensionless viscosity Y1 of the solution of the composite system, wherein Y1 is eta i/eta 0;

Calculating a dimensionless elastic modulus value X1 of the composite system solution, wherein X1 is G 'i/G' 0;

Adopting a split flow physical simulation test, recording the liquid production amounts of high and low permeability pipes filled with viscoelastic particle oil displacement agent-polymer composite solutions with different ratios, and calculating corresponding liquid flow diversion coefficients Qi, wherein the Qi is Hi/Li; hi is the lowest value of the flow rate of the high-permeability pipe, and Li is the highest value of the flow rate of the low-permeability pipe;

and establishing a non-dimensional elastic modulus-liquid flow diversion coefficient-non-dimensional viscosity relation chart of the viscoelastic particle oil displacement agent and polymer composite system by plotting the non-dimensional viscosity, the non-dimensional elasticity and the corresponding liquid flow diversion coefficient under different proportioning conditions according to the results of the third, the fourth and the fifth.

In the above method, the total concentration of the composite system solution is preferably 2000-3000 mg/L.

In the method, preferably, in step 2, the viscoelastic particle oil displacement agent and the polymer composite system solution are selected to be matched with the target oil reservoir. Specifically, the method for determining the corresponding viscoelastic particle oil displacement agent according to the target oil reservoir refers to the patent application "efficient selection method of viscoelastic particle oil displacement agent suitable for different oil reservoir requirements" (CN 109992836A).

in the above method, preferably, in step 4, the viscosity ratio of the composite system to the crude oil is not less than 0.2, and the Q value is the minimum, that is, the optimal ratio of the viscoelastic particle oil displacement agent to the polymer is obtained.

the method disclosed by the invention relates to the selection of the ratio of a measured object under different oil reservoir conditions, and can quickly and effectively realize the optimal ratio optimization of the viscoelastic particle oil displacement agent and the polymer by utilizing the dimensionless elastic modulus-liquid flow turning coefficient-dimensionless viscosity relation chart of the established viscoelastic particle oil displacement agent and polymer composite system.

Drawings

FIG. 1 is a flow chart of the method of the present invention;

FIG. 2 is a non-dimensional elastic modulus-liquid flow turning coefficient-non-dimensional viscosity relation chart of a viscoelastic particle oil displacement agent and polymer composite system in an embodiment of the invention;

FIG. 3 shows that the ratio of the viscoelastic particle oil displacement agent to the polymer in the embodiment of the invention is 1:1, in a shunt curve of a parallel double-pipe sand-filling model with high permeability of 3000 multiplied by 10 < -3 > mu m2 and low permeability of 1000 multiplied by 10 < -3 > mu m 2;

FIG. 4 shows that the ratio of the viscoelastic particle oil displacement agent to the polymer in the embodiment of the invention is 1: the heterogeneous chemical oil displacement system of 1 improves the recovery efficiency curve in a parallel double-pipe sand-packed model with high permeability of 3000 multiplied by 10 < -3 > mu m2 and low permeability of 1000 multiplied by 10 < -3 > mu m 2.

Detailed Description

it is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of the stated features, steps, operations, and/or combinations thereof, unless the context clearly indicates otherwise.

in order to make the technical solutions of the present invention more clearly understood by those skilled in the art, the technical solutions of the present invention will be described in detail below with reference to specific embodiments.

the viscoelastic particle oil displacement agent used in this example was independently developed by the victory oil field (US9080096B2), and the polymer was partially hydrolyzed polyacrylamide. The viscoelastic particle oil-displacing agent and the polymer used in the present invention are not limited to the above components.