Method for acquiring injection parameter value of layered polymer injection well

Abstract

The invention provides a method for obtaining injection parameter values of a layered polymer injection well. The method comprises the steps that first experimental data and second experimental data are obtained; 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, and 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 an injection parameter value. By means of the method for obtaining the injection parameter value of the layered polymer injection well, data errors can be corrected, the injection parameter value of the polymer injection well can be accurately calculated, and it is guaranteed that the injection amount of the layered polymer injection solution can be controlled within a reasonable range.

Description

Technical Field

[0001] The invention relates to the technical field of oil production, and in particular to a method for obtaining injection parameter values ​​of a layered polymer injection well. Background Art

[0002] In the development process of polymer injection blocks in oil fields, in order to ensure the accuracy of the injection volume, clean water is usually injected for a period of time before the polymer solution is injected in layers in the polymer injection wells, and then the polymer solution is injected. In this process, the injection parameter values ​​obtained by intelligent devices may have certain data deviations. Therefore, in the prior art, the empirical formula of ground tests is used to compensate and optimize the injection parameter values. However, since the fluidity of polymers in the downhole environment will change under high temperature and high pressure conditions, when the injection parameter values ​​are compensated and optimized based on the empirical formula of ground tests, data errors will still be caused, causing inconvenience and trouble 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 the polymer injection wells to ensure that the injection volume of the stratified polymer injection solution can be controlled within a reasonable range.

[0004] In a first aspect, an embodiment of the present invention provides a method for obtaining formation pressure of a reservoir, characterized by comprising:

[0005] Acquiring first experimental data and second experimental data;

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

[0007] Performing linear interpolation calculation based on the incremental data and the second experimental data to obtain first interpolation data;

[0008] Acquire second interpolation data, and perform error correction based on the first interpolation data and the second interpolation data to acquire error data;

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

[0010] Preferably, the first experimental data includes: water injection flow rate Q 清水 , polymer injection 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: the conversion start time T 转换 , the total time of the conversion process T 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 interpolation data Q(t), first pressure interpolation data P(t).

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

[0027] Q 流误 =Q 实测 -Q(t)

[0028] The pressure error data P 压误 It is expressed by the following formula:

[0029] P 压误 =P 实测 -P(t).

[0030] Preferably, the injection parameter value includes:

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

[0032] Preferably, the injection flow parameter value Q 流修 It is expressed by the following formula:

[0033] Q 流修 =Q 实测 -Q 流误

[0034] The injection pressure parameter value P 压修 It is expressed by the following formula:

[0035] P 压修 =P 实测 -P 流误 .

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

[0037] The first interpolation data is obtained by obtaining the first experimental data and the second experimental data, and performing linear interpolation calculation based on the first experimental data and the second experimental data; the second interpolation data is obtained, and error correction is performed based on the first interpolation data and the second interpolation data to obtain error data; the second interpolation data is corrected based on the error data to obtain the injection parameter value, wherein, through the method for obtaining the injection parameter value of the stratified polymer injection well provided by the present invention, the corrected injection parameter value can be obtained, and it is ensured that the injection amount of the stratified polymer injection solution can be controlled within a reasonable range, thereby enhancing the polymer injection efficiency and development effect, reducing resource waste, and improving the economic benefits of oil field development.

[0038] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0039] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0041] Figure 1 A schematic flow chart of a method for obtaining injection parameter values ​​of a stratified polymer injection well provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

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

[0044] To facilitate understanding of this embodiment, Figure 1 A method for obtaining the formation pressure of a reservoir disclosed in an embodiment of the present invention is introduced in detail.

[0045] Embodiment 1:

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

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

[0048] The first experimental data includes: water injection flow rate Q 清水 , polymer injection 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 of the conversion process T 总 ;

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

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

[0051] Preferably, the incremental data includes: flow interpolation increment ΔQ, 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 calculation based on the incremental data and the second experimental data to obtain first interpolation data;

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

[0058] The first flow interpolation data is an injection flow value obtained by linear interpolation calculation based on the incremental data and the second experimental data; the first pressure interpolation data is an injection pressure value obtained by linear interpolation calculation based on the incremental data and the 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 conversion process between water injection and polymer injection;

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

[0065] Specifically, the second interpolation data includes: the second flow interpolation data Q 实测 And the second pressure interpolation data P 实测 , the second flow interpolation data Q 实测 is the injection flow rate value measured by the intelligent injection device at a certain moment in the actual water injection and polymer injection conversion process, and the second flow interpolation data P 实测 The injection pressure value measured by the intelligent injection device at a certain moment in 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 It is expressed by the following formula:

[0068] Q 流误 =Q 实测 -Q(t)

[0069] Pressure error data P 压误 It is 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 to obtain an injection parameter value;

[0072] Preferably, the injection parameter value is the injection parameter of the layered polymer injection well, including: the injection flow parameter value Q 流修 , injection pressure parameter value P 压修 ;

[0073] The second interpolation data is corrected based on the error data, so that the injection flow parameter value at any time t and the injection pressure parameter value at any time t can be obtained during the actual water injection and polymer injection conversion process;

[0074] Injection flow parameter value Q 流修 It is expressed by the following formula:

[0075] Q 流修 =Q 实测 -Q 流误

[0076] Injection pressure parameter value P 压修 It is expressed by the following formula:

[0077] P 压修 =P 实测 -P 流误

[0078] Embodiment 2:

[0079] In order to enable those skilled in the art to better and more clearly understand the technical solution of the present application, the following will be based on the method provided in Example 1 to obtain the injection parameter value at t = 0.75h during the actual water injection and polymer injection conversion process. The specific steps are as follows:

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

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

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

[0083] 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] The total time of the conversion process is T 总 =1h;

[0087] Step 2: Based on the first experimental data obtained in step 1, obtain incremental data. The specific data is as follows:

[0088] Among them, 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 values ​​for the pressure interpolation increment are:

[0091] ΔP=P 聚合物溶液 -P 清水 =6–5=1MPa

[0092] Step 3: Perform linear interpolation calculation based on the 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 are as follows:

[0093] Among them, 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=5.5MPa

[0097] Step 4: Obtain the second interpolation data at t=0.5h by measuring with the intelligent injection device, perform error correction based on the first interpolation data and the second interpolation data, and obtain error data. The specific data is as follows:

[0098] Among them, 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 value of the flow error data is:

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

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

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

[0106] Step 5: Obtain the second interpolation data at t=0.75h by measuring with the intelligent injection device, correct the second interpolation data at t=0.75h based on the error data, and obtain the injection parameter value at t=0.75h;

[0107] Among them, 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 value at t=0.75h, including:

[0112] Among them, when t = 0.75h, the value of the injection flow 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=5.65MPa

[0116] At this time, based on the error data and the second interpolation data measured and 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 only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A method for obtaining injection parameter values ​​of a layered polymer injection well, characterized in that: include: Acquiring first experimental data and second experimental data; Based on the first experimental data, acquiring incremental data; Performing linear interpolation calculation based on the incremental data and the second experimental data to obtain first interpolation data; Acquire second interpolation data, and perform error correction based on the first interpolation data and the second interpolation data to acquire error data; The second interpolation data is corrected based on the error data to obtain an injection parameter value.

2. A method for obtaining injection parameter values ​​of a stratified polymer injection well according to claim 1, characterized in that: Also includes: The first experimental data includes: water injection flow rate Q 清水 , polymer injection 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: the conversion start time T 转换 , the total time of the conversion process T 总 .

3. A method for obtaining injection parameter values ​​of a stratified polymer injection well according to claim 2, characterized in that: The incremental data includes: Flow interpolation increment ΔQ, pressure interpolation increment ΔP.

4. A method for obtaining injection parameter values ​​of a stratified polymer injection well according to claim 3, characterized in that: Also includes: The flow interpolation increment ΔQ is expressed by the following formula: ΔQ=Q 聚合物溶液 -Q 清水 The pressure interpolation increment ΔP is expressed by the following formula: ΔP=P 聚合物溶液 -P 清水 。 5. A method for obtaining injection parameter values ​​of a layered polymer injection well according to claim 4, characterized in that: The first interpolation data includes: First flow interpolation data Q(t), first pressure interpolation data P(t).

6. A method for obtaining injection parameter values ​​of a stratified polymer injection well according to claim 5, characterized in that: Also includes: The first flow interpolation data Q(t) is expressed by the following formula: Q(t)=Q 清水 +ΔQ*(t-T 转换 ) / T 总 The first pressure interpolation data P(t) is expressed by the following formula: P(t)=P 清水 +ΔP*(t-T 转换 ) / T 总 。 7. A method for obtaining injection parameter values ​​of a stratified polymer injection well according to claim 6, characterized in that: The error data includes: Flow error data Q 流误 , pressure error data P 压误 .

8. A method for obtaining injection parameter values ​​of a stratified polymer injection well according to claim 7, characterized in that: Also includes: The flow error data Q 流误 It is expressed by the following formula: Q 流误 =Q 实测 -Q(t) The pressure error data P 压误 It is expressed by the following formula: P 压误 =P 实测 -P(t)。 9. A method for obtaining injection parameter values ​​of a stratified polymer injection well according to claim 8, characterized in that: The injection parameter values ​​include: Injection flow parameter value Q 流修 , injection pressure parameter value P 压修 .

10. A method for obtaining injection parameter values ​​of a stratified polymer injection well according to claim 9, characterized in that: Also includes: The injection flow parameter value Q 流修 It is expressed by the following formula: Q 流修 =Q 实测 -Q 流误 The injection pressure parameter value P 压修 It is expressed by the following formula: P 压修 =P 实测 -P 流误 。

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