Oil pumping unit balance degree diagnosis method based on electrical parameters

Abstract

An oil pumping unit balance degree diagnosis method based on electrical parameters belongs to the technical field of oil industry Internet of Things data analysis and application, and comprises the following steps: S1, continuously measuring power values of an oil pumping unit by using a system efficiency test instrument or other electrical parameter acquisition equipment, obtaining 600 time sequence power values and a sampling period of 120ms, and identifying upper and lower dead point positions; s2, filtering calculation is carried out on the obtained 600 time sequence power data, and a filtered power value is obtained; s3, solving the maximum value of the power value after the interval from the top dead center to the bottom dead center is filtered; s4, solving the maximum value of the power value after the interval between the bottom dead center and the top dead center is filtered; s5, calculating the balance degree; and S6, judging whether the balance degree is under-balance or over-balance. According to the method, the problems of false balance and false imbalance existing in balance testing of a traditional current method and a power method are solved, the event of improper balance degree adjustment caused by wrong diagnosis is avoided, the balance degree diagnosis precision is improved, and therefore the power consumption of the oil pumping unit is indirectly reduced.

Description

Technical Field

[0001] This invention belongs to the field of petroleum industry Internet of Things data analysis application technology, specifically relating to a method for diagnosing the balance of an oil pumping unit based on electrical parameters. Background Technology

[0002] When a beam pumping unit is operating, to ensure a more balanced load on the motor, it is necessary to measure the unit's balance and adjust it accordingly. Currently, there are three main methods for measuring the balance of a beam pumping unit:

[0003] (1) Current method. That is, the ratio of the maximum current during the downstroke to the maximum current during the upstroke. Balance = Downstroke peak current / Upstroke peak current.

[0004] (2) Power method. That is, the ratio of the maximum power during the downstroke to the maximum power during the upstroke. Balance = Downstroke peak power / Upstroke peak power.

[0005] (3) Average power method. According to the "Balance and Operation Specifications of Beam Pumping Unit" (Q / SY1233-2009), the balance is the ratio of the average power of the upstroke and downstroke, with the larger value as the denominator. When the balance value is less than 0.5, the pumping unit is judged to be unbalanced.

[0006] In actual production, phenomena such as transmission obstruction and liquid slugging during the operation of the pumping unit can cause sudden increases in current and power. The current method and power method cannot accurately reflect the actual balance of the pumping unit. When liquid slugging or transmission obstruction disappears, the measured balance value changes, resulting in repeated adjustments to the pumping unit's balance. The average power method cannot determine whether the pumping unit is over-balanced or under-balanced based on the balance value; therefore, the current method or power method is still needed to verify the balance status in actual production. Summary of the Invention

[0007] To address the problems existing in the above-mentioned balance measurement methods, this invention proposes a method for diagnosing the balance of an oil pumping unit based on electrical parameters, comprising the following steps:

[0008] S1. Use a system efficiency testing instrument or other electrical parameter acquisition equipment to continuously measure the power value of the pumping unit, obtain 600 time-series power values, with a sampling period of 120ms, and mark the positions of the upper and lower dead points.

[0009] S2. Filter and calculate the power value after filtering from the 600 time-series power data.

[0010] S3. Find the maximum power value after filtering in the interval from the top dead center to the bottom dead center;

[0011] S4. Find the maximum power value after filtering in the interval from the bottom dead center to the top dead center;

[0012] S5. Calculate the balance.

[0013] S6. Determine whether the balance is underbalanced or overbalanced.

[0014] Furthermore, let P(i) be the original power value, and the value of i ranges from 1 to 600.

[0015] Furthermore, let PF(i) be the filtered power value, and let the value of i range from 10 to 591.

[0016] Furthermore, the formula for calculating the filtered power value PF(i) is as follows:

[0017] PF(i)=P(i-9)*0.01+P(i-8)*0.02+P(i-7)*0.03+P(i-6)*0.04+P(i-5)*0.05+P(i-4)*0.06+P(i-3)*0.07+P(i-2)*0.08+P(i-1)*0.09+P (i)*0.1+P(i+1)*0.09+P(i+2)*0.08+P(i+3)*0.07+P(i+4)*0.06+P(i+5)*0.05+P(i+6)*0.04+P(i+7)*0.03+P(i+8)*0.02+P(i+9)*0.01.

[0018] Furthermore, the maximum power value after filtering is obtained in the interval from the upper dead point to the lower dead point, denoted as P. 下行 .

[0019] Furthermore, the maximum power value after filtering is obtained in the interval from the bottom dead center to the top dead center, denoted as P. 上行 .

[0020] Furthermore, the formula for calculating the degree of balance is: Degree of balance = P 下行 / P 上行 When the balance degree is less than 0.8, it is considered underbalanced; when the balance degree is greater than 1, it is considered overbalanced.

[0021] The beneficial effects of this invention are as follows: This invention solves the problems of false balance and false imbalance in traditional current method and power method balance test, avoids the occurrence of inappropriate balance adjustment caused by misdiagnosis, improves the accuracy of balance diagnosis, and thus indirectly reduces the power consumption of the oil pumping unit. Attached Figure Description

[0022] Figure 1 This is a current curve diagram of the present invention;

[0023] Figure 2 This is a power curve diagram of the present invention. Detailed Implementation

[0024] To make the technical means and objectives of this invention easier to understand, the invention is further described below with reference to specific embodiments. A method for diagnosing the balance of an oil pumping unit based on electrical parameters includes the following steps:

[0025] S1. Use a system efficiency testing instrument or other electrical parameter acquisition equipment to continuously measure the power value of the pumping unit, obtain 600 time-series power values, with a sampling period of 120ms, and mark the positions of the upper and lower dead points.

[0026] S2. Filter and calculate the power value after filtering from the 600 time-series power data.

[0027] S3. Find the maximum power value after filtering in the interval from the top dead center to the bottom dead center;

[0028] S4. Find the maximum power value after filtering in the interval from the bottom dead center to the top dead center;

[0029] S5. Calculate the balance.

[0030] S6. Determine whether the balance is underbalanced or overbalanced.

[0031] In step S2, P(i) is the original power value, and the value of i ranges from 1 to 600.

[0032] In step S2, PF(i) is the filtered power value, and the value of i ranges from 10 to 591.

[0033] In step S2, the formula for calculating the filtered power value PF(i) is as follows:

[0034] PF(i)=P(i-9)*0.01+P(i-8)*0.02+P(i-7)*0.03+P(i-6)*0.04+P(i-5)*0.05+P(i-4)*0.06+P(i-3)*0.07+P(i-2)*0.08+P(i-1)*0.09+P (i)*0.1+P(i+1)*0.09+P(i+2)*0.08+P(i+3)*0.07+P(i+4)*0.06+P(i+5)*0.05+P(i+6)*0.04+P(i+7)*0.03+P(i+8)*0.02+P(i+9)*0.01.

[0035] In step S3, the maximum power value after filtering in the interval from the upper dead point to the lower dead point is calculated and denoted as P. 下行 .

[0036] In step S4, the maximum power value after filtering in the interval from the lower dead center to the upper dead center is calculated and denoted as P.上行 .

[0037] In step S5, the formula for calculating the balance is: Balance = P 下行 / P 上 OK.

[0038] In step S6, when the balance degree is less than 0.8, it is underbalanced; when the balance degree is greater than 1, it is overbalanced.

[0039] Example:

[0040] The method for diagnosing the balance of an oil pumping unit based on electrical parameters is calculated according to the following steps:

[0041] S1. Use a system efficiency testing instrument or other electrical parameter acquisition equipment to continuously measure the power value of the pumping unit, obtain 600 time-series power values ​​(sampling period 120ms), and mark the positions of the upper and lower dead points;

[0042] S2. Filter and calculate the power value after filtering from the 600 time-series power data.

[0043] S3. Find the maximum power value after filtering in the interval from the top dead center to the bottom dead center;

[0044] S4. Find the maximum power value after filtering in the interval from the bottom dead center to the top dead center;

[0045] S5. Calculate the balance.

[0046] S6. Determine whether the balance is underbalanced or overbalanced.

[0047] P(i) - the original power value, where i ranges from 1 to 600;

[0048] PF(i) - Power value after filtering, where i ranges from 10 to 591;

[0049] PF(i)=P(i-9)*0.01+P(i-8)*0.02+P(i-7)*0.03+P(i-6)*0.04+P(i-5)*0.05+P(i-4)*0.06+P(i-3)*0.07+P(i-2)*0.08+P(i-1)*0.09+P (i)*0.1+P(i+1)*0.09+P(i+2)*0.08+P(i+3)*0.07+P(i+4)*0.06+P(i+5)*0.05+P(i+6)*0.04+P(i+7)*0.03+P(i+8)*0.02+P(i+9)*0.01

[0050] Find the maximum power value after filtering in the interval from the top dead center to the bottom dead center, and denote it as P. 下行 .

[0051] Find the maximum power value after filtering in the interval from the bottom dead center to the top dead center, and denote it as P. 上行 .

[0052] Balance equals P 下行 / P 上行 When the value is less than 0.8, it is considered underbalanced; when it is greater than 1, it is considered overbalanced.

[0053] like Figure 1-Figure 2 As shown, taking the electrical parameter curve of a certain pumping unit well as an example, the balance degree is calculated using different methods.

[0054] (1) The balance is calculated using the current method. The maximum current of the lower stroke is 21.768A, the maximum current of the upper stroke is 21.536A, and the balance is 101.08%.

[0055] (2) Calculate the balance using the power method. The maximum power of the lower stroke is 3225W, the maximum power of the upper stroke is 3220W, and the balance is 100%.

[0056] (3) The balance was calculated using the average power method. The average power of the lower stroke was 898.33W, the average power of the upper stroke was 1464.6W, and the balance was 0.613%.

[0057] (4) The balance was calculated using the method of the present invention. The maximum power of the lower stroke after filtering was 1401.5W, the maximum power of the upper stroke after filtering was 2703.5W, and the balance was 51.84%.

[0058] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for diagnosing the balance of an oil pumping unit based on electrical parameters, characterized in that, The steps include: S1. Use a system efficiency testing instrument or other electrical parameter acquisition equipment to continuously measure the power value of the pumping unit, obtain 600 time-series power values, with a sampling period of 120ms, and mark the positions of the upper and lower dead points. S2. Filter and calculate the power value after filtering from the 600 time-series power data. S3. Find the maximum power value after filtering in the interval from the top dead center to the bottom dead center; S4. Find the maximum power value after filtering in the interval from the bottom dead center to the top dead center; S5. Calculate the balance. S6. Determine whether the balance is underbalanced or overbalanced.

2. The method for diagnosing the balance of an oil pumping unit based on electrical parameters as described in claim 1, characterized in that, In step S2, let P(i) be the original power value, and the value of i ranges from 1 to 600.

3. The method for diagnosing the balance of an oil pumping unit based on electrical parameters as described in claim 2, characterized in that, In step S2, let PF(i) be the filtered power value, and the value of i ranges from 10 to 591.

4. The method for diagnosing the balance of an oil pumping unit based on electrical parameters as described in claim 3, characterized in that, In step S2, the formula for calculating the filtered power value PF(i) is as follows: PF(i)=P(i-9)*0.01+P(i-8)*0.02+P(i-7)*0.03+P(i-6)*0.04+P(i-5)*0.05+P(i-4)*0.06+P(i-3)*0.07+P(i-2)*0.08+P(i-1)*0.09+P (i)*0.1+P(i+1)*0.09+P(i+2)*0.08+P(i+3)*0.07+P(i+4)*0.06+P(i+5)*0.05+P(i+6)*0.04+P(i+7)*0.03+P(i+8)*0.02+P(i+9)*0.

01.

5. The method for diagnosing the balance of an oil pumping unit based on electrical parameters as described in claim 4, characterized in that, In step S3, the maximum power value after filtering in the interval from the upper dead point to the lower dead point is calculated and denoted as P. 下行 .

6. The method for diagnosing the balance of an oil pumping unit based on electrical parameters as described in claim 5, characterized in that, In step S4, the maximum power value after filtering in the interval from the lower dead point to the upper dead point is calculated and denoted as P. 上行 .

7. The method for diagnosing the balance of an oil pumping unit based on electrical parameters as described in claim 6, characterized in that, In step S5, the formula for calculating the balance is: Balance = P 下行 / P 上 OK.

8. The method for diagnosing the balance of an oil pumping unit based on electrical parameters as described in claim 7, characterized in that, In step S6, when the balance degree is less than 0.8, it is underbalanced; when the balance degree is greater than 1, it is overbalanced.

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