Method for obtaining injection parameter values for a stratified polymer injection well

Abstract

The application provides a method for obtaining injection parameter values of a stratified polymer injection well, comprising: obtaining first experimental data and second experimental data; obtaining incremental data based on the first experimental data; performing linear interpolation calculation based on the incremental data and the second experimental data to obtain first interpolation data; obtaining second interpolation data, performing error correction based on the first interpolation data and the second interpolation data to obtain error data; and correcting the second interpolation data based on the error data to obtain injection parameter values. The method for obtaining injection parameter values of a stratified polymer injection well can correct data errors, accurately calculate injection parameter values of a polymer injection well, and ensure that the injection amount of stratified polymer solution can be controlled within a reasonable range.

Description

Technical Field

[0001] This invention relates to the field of oil extraction technology, and in particular to a method for obtaining injection parameter values ​​in stratified polymer injection wells. Background Technology

[0002] In the development of polymer injection blocks in oilfields, to ensure accurate injection volume, a period of clean water is typically injected before stratified polymer solution injection in the injection well. During this process, the injection parameter values ​​obtained using intelligent equipment may exhibit some data deviation. Therefore, existing technologies utilize empirical formulas from surface testing to compensate and optimize the injection parameter values. However, because the fluidity of polymers changes under high temperature and pressure conditions in the downhole environment, data errors still occur when using empirical formulas from surface testing for data compensation and optimization, causing inconvenience and disruption to production. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a method for obtaining injection parameter values ​​of stratified polymer injection wells, which can take into account the special conditions of the downhole environment and accurately calculate the injection parameter values ​​of polymer injection wells, so as to ensure that the injection volume of stratified polymer injection solution can be controlled within a reasonable range.

[0004] In a first aspect, embodiments of the present invention provide a method for obtaining formation pressure in a reservoir, characterized in that it includes:

[0005] Obtain the first and second experimental data;

[0006] Based on the first experimental data, incremental data is obtained;

[0007] Linear interpolation calculations are performed based on the incremental data and the second experimental data to obtain the first interpolation data;

[0008] Obtain the second interpolation data, perform error correction based on the first interpolation data and the second interpolation data, and obtain the error data;

[0009] The second interpolation data is corrected based on the error data to obtain the injection parameter value.

[0010] Preferably, the first experimental data includes: water injection flow rate Q 清水 Polymer flow rate Q 聚合液溶液 Water injection pressure P 清水 Polymer injection pressure P 聚合液溶液 ;

[0011] The second experimental data includes: conversion start time T 转换 The total time T of the conversion process 总 .

[0012] Preferably, the incremental data includes:

[0013] Flow interpolation increment ΔQ, pressure interpolation increment ΔP.

[0014] Preferably, the flow interpolation increment ΔQ is expressed by the following formula:

[0015] ΔQ=Q 聚合物溶液 -Q 清水

[0016] The pressure interpolation increment ΔP is expressed by the following formula:

[0017] ΔP=P 聚合物溶液 -P 清水 .

[0018] Preferably, the first interpolation data includes:

[0019] First flow rate interpolation data Q(t), first pressure interpolation data P(t).

[0020] Preferably, the first flow interpolation data Q(t) is represented by the following formula:

[0021] Q(t) = Q 清水 +ΔQ*(tT 转换 ) / T 总

[0022] The first pressure interpolation data P(t) is expressed by the following formula:

[0023] P(t)=P 清水 +ΔP*(tT 转换 ) / T 总 .

[0024] Preferably, the error data includes:

[0025] Flow error data Q 流误 Pressure error data P 压误 .

[0026] Preferably, the flow error data Q 流误 This can be expressed by the following formula:

[0027] Q 流误 =Q 实测 -Q(t)

[0028] The pressure error data P 压误 This can be expressed by the following formula:

[0029] P 压误 =P 实测 -P(t).

[0030] Preferably, the injection parameter values ​​include:

[0031] Injection flow parameter value Q 流修 Injection pressure parameter value P 压修 .

[0032] Preferably, the injected flow rate parameter value Q 流修 This can be expressed by the following formula:

[0033] Q 流修 =Q 实测 -Q 流误

[0034] The injection pressure parameter value P 压修 This can be expressed by the following formula:

[0035] P 压修 =P 实测 -P 流误 .

[0036] The beneficial effects of this invention are as follows:

[0037] By acquiring first and second experimental data, and performing linear interpolation calculations based on the first and second experimental data to obtain first interpolated data; acquiring second interpolated data, and performing error correction based on the first and second interpolated data to obtain error data; and correcting the second interpolated data based on the error data to obtain injection parameter values, the method for obtaining injection parameter values ​​in a stratified polymer injection well provided by this invention can obtain corrected injection parameter values, ensuring that the injection volume of the stratified polymer injection solution can be controlled within a reasonable range, thereby enhancing polymer injection efficiency and development effect, reducing resource waste, and improving the economic benefits of oilfield development.

[0038] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained in accordance with the structures particularly pointed out in the description, claims and drawings.

[0039] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0040] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0041] Figure 1 This is a schematic flowchart of a method for obtaining injection parameter values ​​in a layered polymer injection well, provided by an embodiment of the present invention. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] The present invention provides a method for obtaining reservoir formation pressure, which can correct data errors, accurately calculate the injection parameter values ​​of polymer injection wells, and ensure that the injection volume of stratified polymer injection solution can be controlled within a reasonable range.

[0044] To facilitate understanding of this embodiment, in conjunction with Figure 1 A method for obtaining reservoir formation pressure disclosed in the embodiments of the present invention will be described in detail.

[0045] Example 1:

[0046] The method for obtaining injection parameter values ​​in a stratified polymer injection well disclosed in this embodiment of the invention comprises the following steps:

[0047] Step 1: Obtain the first experimental data and the second experimental data;

[0048] The first experimental data includes: water injection flow rate Q 清水 Polymer flow rate Q 聚合液溶液 Water injection pressure P 清水 Polymer injection pressure P 聚合液溶液 The second experimental data includes: conversion start time T. 转换 The total time T of the conversion process 总 ;

[0049] Specifically, in the actual water injection and polymer injection conversion process, intelligent injection equipment is used for water injection and polymer injection, and the first experimental data and the second experimental data are measured and recorded based on the intelligent injection equipment; wherein, the actual water injection and polymer injection conversion process includes injecting clean water into the polymer injection well, and after injecting clean water, injecting polymer solution;

[0050] Step 2: Based on the first experimental data, obtain incremental data;

[0051] Preferably, the incremental data includes: flow interpolation increment ΔQ and pressure interpolation increment ΔP;

[0052] The flow interpolation increment ΔQ is expressed by the following formula:

[0053] ΔQ=Q 聚合物溶液 -Q 清水

[0054] The pressure interpolation increment ΔP is expressed by the following formula:

[0055] ΔP=P 聚合物溶液 -P 清水

[0056] Step 3: Perform linear interpolation calculations based on the incremental data and the second experimental data to obtain the first interpolation data;

[0057] Preferably, the first interpolation data includes: first flow rate interpolation data Q(t) and first pressure interpolation data P(t);

[0058] The first flow rate interpolation data is the injection flow rate value obtained by linear interpolation calculation based on incremental data and second experimental data; the first pressure interpolation data is the injection pressure value obtained by linear interpolation calculation based on incremental data and second experimental data.

[0059] The first flow interpolation data Q(t) is expressed by the following formula:

[0060] Q(t) = Q 清水 +ΔQ*(tT 转换 ) / T 总

[0061] The first pressure interpolation data P(t) is expressed by the following formula:

[0062] P(t)=P 清水 +ΔP*(tT 转换 ) / T 总

[0063] In this embodiment, time t is any time during the actual water injection and polymer injection conversion process;

[0064] Step 4: Obtain the second interpolation data, perform error correction based on the first and second interpolation data, and obtain the error data;

[0065] Specifically, the second interpolation data includes: second flow interpolation data Q. 实测 And the second pressure interpolation data P 实测 Second flow interpolation data Q 实测 The second flow rate interpolation data P is the injection flow rate value measured by the intelligent injection device at a certain moment during the actual water injection and polymer injection conversion process. 实测 The injection pressure value is measured and obtained by intelligent injection equipment at a certain moment during the actual water injection and polymer injection conversion process;

[0066] Preferably, the error data includes: flow error data Q 流误 Pressure error data P 压误 ;

[0067] Among them, the flow error data Q 流误 This can be expressed by the following formula:

[0068] Q 流误 =Q 实测 -Q(t)

[0069] Pressure error data P 压误 This can be expressed by the following formula:

[0070] P 压误 =P 实测 -P(t)

[0071] Step 5: Correct the second interpolation data based on the error data and obtain the injection parameter values;

[0072] Preferably, the injection parameter values ​​are the injection parameters of the stratified polymer injection well, including: the injection flow rate parameter value Q. 流修 Injection pressure parameter value P 压修 ;

[0073] Among them, by correcting the second interpolation data based on the error data, it is possible to obtain the injection flow rate parameter value and the injection pressure parameter value at any time t during the actual water injection and polymer injection conversion process.

[0074] Injection flow parameter value Q 流修 This can be expressed by the following formula:

[0075] Q 流修 =Q 实测 -Q 流误

[0076] Injection pressure parameter value P 压修 This can be expressed by the following formula:

[0077] P 压修 =P 实测 -P 流误

[0078] Example 2:

[0079] To enable those skilled in the art to better understand the technical solution of this application, the injection parameter values ​​at t=0.75h during the actual water injection and polymer injection conversion process will be obtained based on the method provided in Example 1. The specific steps are as follows:

[0080] Step 1: Obtain the first and second experimental data of a stratified polymer injection well using an intelligent injection device. The specific data are as follows:

[0081] Water injection flow rate Q 清水 =4m 3 / h;

[0082] Polymer flow rate Q 聚合液溶液 =3m 3 / h;

[0083] Water injection pressure P 清水 =5MPa;

[0084] Polymer injection pressure P 聚合液溶液 =6MPa;

[0085] Conversion start time T 转换 =0h;

[0086] Total time T of the conversion process 总 =1h;

[0087] Step 2: Based on the first experimental data obtained in Step 1, obtain incremental data, the specific data of which are as follows:

[0088] The value of the flow interpolation increment is:

[0089] ΔQ=Q 聚合物溶液 -Q 清水 =3–4=-1m 3 / h

[0090] The value of the pressure interpolation increment is:

[0091] ΔP=P 聚合物溶液 -P 清水 =6–5 = 1 MPa

[0092] Step 3: Perform linear interpolation calculations based on incremental data and the second experimental data to calculate the first interpolation data at time t = 0.5h during the actual water injection and polymer injection conversion process. The specific data is as follows:

[0093] The value of the first flow interpolation data is:

[0094] Q(t) = Q 清水 +ΔQ*(tT 转换 ) / T 总 =4 + (-1)*(0.5–0) / 1 = 3.5m 3 / h

[0095] The value of the first pressure interpolation data is:

[0096] P(t)=P 清水 +ΔP*(tT 转换 ) / T 总 =5 + 1*(0.5 – 0) / 1 = 5.5 MPa

[0097] Step 4: Obtain the second interpolation data at t=0.5h using the intelligent injection device. Based on the first and second interpolation data, perform error correction and obtain the error data, as follows:

[0098] Specifically, when t = 0.5h, the value of the second flow interpolation data is:

[0099] Q 实测 =3.6m 3 / h;

[0100] When t = 0.5h, the value of the second pressure interpolation data is:

[0101] P 实测 =5.6MPa

[0102] The values ​​for the flow error data are as follows:

[0103] Q 流误 =Q 实测 -Q(t)=3.6–3.5=0.1m 3 / h

[0104] The values ​​of the pressure error data are:

[0105] P 压误 =P 实测 -P(t)=5.6–5.5=0.1MPa

[0106] Step 5: Measure and obtain the second interpolation data at t=0.75h using the intelligent injection device, correct the second interpolation data at t=0.75h based on the error data, and obtain the injection parameter values ​​at t=0.75h;

[0107] Specifically, when t = 0.75h, the value of the second flow interpolation data is:

[0108] Q实测 =3.25m 3 / h;

[0109] When t = 0.75h, the value of the second pressure interpolation data is:

[0110] P 实测 =5.75MPa

[0111] Based on the error data obtained in step 4 of Example 2, the second interpolation data at t = 0.75h is corrected to obtain the injection parameter values ​​at t = 0.75h, including:

[0112] When t = 0.75h, the value of the injection flow rate parameter is:

[0113] Q 流修 =Q 实测 -Q 流误 =3.25 – 0.1 = 3.15m 3 / h

[0114] When t = 0.75h, the value of the injection pressure parameter is:

[0115] P 压修 =P 实测 -P 流误 =5.75 – 0.1 = 5.65 MPa

[0116] At this point, based on the error data and the second interpolation data obtained by the intelligent injection device at any time t, the injection parameter value at any time t can be obtained.

[0117] Finally, it should be noted that the above-described embodiments are merely specific implementations of the present invention, used to illustrate the technical solutions of the present invention, and not to limit it. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the technical scope disclosed in the present invention, or make equivalent substitutions for some of the technical features; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for obtaining injection parameter values ​​in a stratified polymer injection well, characterized in that, include: Obtain the first and second experimental data; The first experimental data includes: water injection flow rate Polymer flow rate Water injection pressure Polymer injection pressure ; The second experimental data includes: conversion start time. Total time of the conversion process ; Based on the first experimental data, incremental data is obtained; the incremental data includes: traffic interpolation increment. Pressure interpolation increment ; The flow interpolation increment This can be expressed by the following formula: The pressure interpolation increment This can be expressed by the following formula: Linear interpolation is performed based on the incremental data and the second experimental data to obtain first interpolated data; the first interpolated data includes: First flow interpolation data First pressure interpolation data ; First flow interpolation data This can be expressed by the following formula: First pressure interpolation data This can be expressed by the following formula: Obtain the second interpolation data, perform error correction based on the first interpolation data and the second interpolation data, and obtain the error data; Based on the error data, the second interpolation data is corrected to obtain the injection parameter value; The second interpolation data includes: second flow rate interpolation data. and second pressure interpolation data Second flow interpolation data This refers to the injection flow rate value measured by an intelligent injection device at a specific moment during the actual water injection and polymer injection conversion process, along with second pressure interpolation data. This refers to the injection pressure value measured by an intelligent injection device at a specific moment during the actual water injection and polymer injection conversion process.

2. The method for obtaining injection parameter values ​​in a stratified polymer injection well according to claim 1, characterized in that, The error data includes: Flow error data Pressure error data .

3. The method for obtaining injection parameter values ​​in a stratified polymer injection well according to claim 2, characterized in that, Also includes: The flow error data This can be expressed by the following formula: The pressure error data This can be expressed by the following formula: 。 4. The method for obtaining injection parameter values ​​in a stratified polymer injection well according to claim 3, characterized in that, The injection parameter values ​​include: Injection flow parameter values Injection pressure parameter value .

5. The method for obtaining injection parameter values ​​in a stratified polymer injection well according to claim 4, characterized in that, Also includes: The injected flow rate parameter value This can be expressed by the following formula: The injection pressure parameter value This can be expressed by the following formula: 。

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