Efficiency potential analysis method of pumping well system based on six-node efficiency factors

Abstract

The present invention relates to the technical field of oil pumping units, and in particular to a method for analyzing the efficiency potential of an oil pumping well system based on six-node efficiency factors. The method comprises: obtaining the operating parameters of the oil pumping well; calculating the six-node efficiency factors of the oil pumping well system through the operating parameters; wherein the six-node efficiency factors include: the efficiency factor of the drag device, the oil pumping unit efficiency factor, the packing box efficiency factor, the rod and pipe efficiency factor, the gas expansion efficiency factor and the oil pump efficiency factor; constructing a six-node efficiency factor radar map of the oil pumping well according to the six-node efficiency factors calculated in step S2; evaluating the efficiency potential of the oil pumping well system according to the six-node efficiency factor radar map, and guiding subsequent optimization measures according to the six-node efficiency factor radar map. The analysis method provided by the present invention can accurately and quickly evaluate the operating potential status of each node of the oil pumping well by calculating the efficiency factors of the six nodes of the oil pumping well, and point out the optimization direction of improving the system efficiency of the oil pumping well.

Description

Technical Field

[0001] The invention relates to the technical field of oil pumping units, and in particular to an efficiency potential analysis method of an oil pumping unit well system based on six-node efficiency factors. Background Art

[0002] Pumping wells are an important way of oil production in Daqing Oilfield and even in my country's oilfields. The equipment of the pumping well includes pumping units, motors, reducers, packing boxes, pumping rods, tubing and pumps. The main indicator for measuring the energy saving of pumping units is system efficiency. When the rod pumping system is pumping well fluid, the downhole equipment is subject to its own gravity, the gravity of the liquid column, the viscous resistance of the liquid to the moving parts, the friction between the packing box and the rod column, the friction between the rod and the pipe, and the friction between the moving pairs during its movement. The force situation is very complicated; the power loss of the motor, belt, reducer, four-bar linkage and rope of the ground equipment is also changing under the action of alternating loads. The current mainstream system efficiency potential analysis method mainly divides the system efficiency into two aspects: ground and underground for analysis. First, the analysis is relatively rough and cannot accurately point to the optimization direction of each node; second, the calculation method is relatively complicated, which is not conducive to rapid application on site. Summary of the invention

[0003] 1. Technical issues to be resolved

[0004] The present invention provides a method for analyzing the efficiency potential of a pumping well system based on six-node efficiency factors, so as to overcome the defects of the prior art method for analyzing the efficiency of a pumping well system, which adopts both ground and underground analysis, resulting in complex algorithms, rough analysis, and inability to accurately provide optimization directions.

[0005] (II) Technical solution

[0006] In order to solve the above problems, the present invention provides a method for analyzing the efficiency potential of a pumping well system based on six-node efficiency factors, comprising:

[0007] Step S1, obtaining the operating parameters of the pumping well;

[0008] Step S2, calculating six-node efficiency factors of the oil well pumping system through operating parameters; wherein the six-node efficiency factors include: drag device efficiency factor, oil well pumping unit efficiency factor, packing box efficiency factor, rod and pipe efficiency factor, gas expansion efficiency factor and oil well pump efficiency factor;

[0009] Step S3, constructing a six-node efficiency factor radar chart of the pumping well according to the six-node efficiency factors calculated in step S2;

[0010] Step S4: Evaluate the efficiency potential of the pumping well system according to the six-node efficiency factor radar map, and guide subsequent optimization measures according to the six-node efficiency factor radar map.

[0011] Preferably, the calculation formula of the efficiency factor of the traction device is:

[0012]

[0013] Where: is the efficiency factor of the traction device; α test is the measured load rate of the dragging device; α ideal is the ideal drag device load rate; is the average power; p e is the rated power; k1 is the correction factor of the traction device.

[0014] Preferably, the calculation formula of the pumping unit efficiency factor is:

[0015]

[0016] β ideal =k2·80%

[0017] Where: is the pumping unit efficiency factor; β test is the measured current balance; β ideal is the ideal current balance; γ text is the belt tension test value; γ ideal is the ideal value of belt tension; I max1 is the peak current of the upstroke; I max2 is the peak current of the downstroke; k2 is the correction coefficient of the pumping unit.

[0018] Preferably, the packing box efficiency factor calculation formula is:

[0019]

[0020] Where: is the packing box efficiency factor; N test is the measured torque value of the packing box; N ideal It is the ideal torque value of packing box.

[0021] Preferably, the rod-tube efficiency factor calculation formula is:

[0022]

[0023] Where: is the rod efficiency factor; σ test is the measured maximum stress of the pole column; [σ] is the allowable stress of the pole column; k3 is the correction coefficient of the pole column.

[0024] Preferably, the gas expansion efficiency factor calculation formula is:

[0025]

[0026] Where: is the gas expansion efficiency factor; p test is the measured wellhead pressure; p ideal is the ideal wellhead back pressure; k4 is the pressure correction coefficient.

[0027] Preferably, the oil well pump efficiency factor calculation formula is:

[0028]

[0029] Where: is the oil well pump efficiency factor; h test is the measured sinking degree; h ideal is the ideal submergence; k5 is the submergence correction coefficient.

[0030] Preferably, if the values ​​of the six-node efficiency factors are all > 0.8, it means that the pumping system is in a high-efficiency operation state and no optimization is required;

[0031] If any of the six-node efficiency factors is between 0.6 and 0.8, it means that the pumping system is in a medium-efficiency operation state, and whether to optimize and adjust it can be determined based on the on-site economic conditions.

[0032] When the value of any of the six-node efficiency factors is ≤0.6, it means that the pumping system is in an inefficient operating state and optimization measures are needed.

[0033] (III) Beneficial effects

[0034] The present invention provides a method for analyzing the efficiency potential of a pumping well system based on six-node efficiency factors. By calculating the efficiency factors of the six nodes of the pumping well, the operating potential status of each node of the pumping well can be accurately and quickly evaluated, and the optimization direction for improving the system efficiency of the pumping well can be pointed out. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 The flowchart of the efficiency potential analysis method of the pumping well system based on the six-node efficiency factor is shown;

[0036] Figure 2 Schematic diagram of the radar chart of the six-node efficiency factors in the efficiency potential analysis method of the pumping well system based on the six-node efficiency factors. DETAILED DESCRIPTION

[0037] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0038] like Figure 1As shown, the present invention provides a method for analyzing the efficiency potential of a pumping well system based on six-node efficiency factors, which specifically includes the following steps:

[0039] Step S1, obtaining the operating parameters of the pumping well;

[0040] Step S2, calculating six-node efficiency factors of the oil well pumping system through operating parameters; wherein the six-node efficiency factors include: drag device efficiency factor, oil well pumping unit efficiency factor, packing box efficiency factor, rod and pipe efficiency factor, gas expansion efficiency factor and oil well pump efficiency factor;

[0041] The calculation formula of the efficiency factor of the drag device is:

[0042]

[0043] Where: is the efficiency factor of the traction device; α test is the measured load rate of the dragging device; α ideal is the ideal drag device load rate; is the average power; p e is the rated power; k1 is the correction factor of the traction device.

[0044] The calculation formula of the pumping unit efficiency factor is:

[0045]

[0046] β ideal =k2·80%

[0047] Where: is the pumping unit efficiency factor; β test is the measured current balance; β ideal is the ideal current balance; γ text is the belt tension test value; γ ideal is the ideal value of belt tension; I max1 is the peak current of the upstroke; I max2 is the peak current of the downstroke; k2 is the correction coefficient of the pumping unit.

[0048] The packing box efficiency factor calculation formula is:

[0049]

[0050] Where: is the packing box efficiency factor; N test is the measured torque value of the packing box; N ideal It is the ideal torque value of packing box.

[0051] The rod-tube efficiency factor calculation formula is:

[0052]

[0053] Where: is the rod efficiency factor; σ test is the measured maximum stress of the pole column; [σ] is the allowable stress of the pole column; k3 is the correction coefficient of the pole column.

[0054] The gas expansion efficiency factor calculation formula is:

[0055]

[0056] Where: is the gas expansion efficiency factor; p test is the measured wellhead pressure; p ideal is the ideal wellhead back pressure; k4 is the pressure correction coefficient.

[0057] The oil well pump efficiency factor calculation formula is:

[0058]

[0059] Where: is the oil well pump efficiency factor; h test is the measured sinking degree; h ideal is the ideal submergence; k5 is the submergence correction coefficient.

[0060] Step S3, constructing a six-node efficiency factor radar chart of the pumping well according to the six-node efficiency factors calculated in step S2; the six-node efficiency factor radar chart is as follows: Figure 2 shown.

[0061] Step S4: Evaluate the efficiency potential of the pumping well system according to the six-node efficiency factor radar map, and guide subsequent optimization measures according to the six-node efficiency factor radar map.

[0062] According to the field data, the working parameters are obtained as follows:

[0063] (1) The average power is 7 kW, the rated power is 45 kW, the measured load factor of the traction device is 0.16, the ideal load factor of the traction device is 0.4, and the efficiency factor of the traction device is 0.39;

[0064] (2) The peak current of the upstroke is 44 mA, the peak current of the downstroke is 41 mA, the calculated balance is 0.93, the belt tension value is in the best state, and the pumping unit efficiency factor is 0.93;

[0065] (3) The actual packing torque value measured by the packing torque wrench is 45, the ideal packing torque is 50, and the packing box efficiency factor is calculated to be 0.8;

[0066] (4) The column specification is 25 mm, the measured maximum load is 45.18 kN, and the calculated maximum stress of the column section is 96.2 kN / mm 2 , ideal column stress 130kN / mm 2 , the rod-tube efficiency factor is 0.74;

[0067] (5) The measured wellhead back pressure is 0.475 MPa, the ideal wellhead back pressure is 0.5 MPa, and the gas expansion efficiency factor is 0.95;

[0068] (6) The measured submergence is 662.9 m, the ideal submergence is 300 m, and the calculated oil well pump efficiency factor is 0.53.

[0069] According to the above calculated values, we can get Figure 2 Six-node efficiency factor radar chart.

[0070] In practical applications, if the values ​​of the six-node efficiency factors are all greater than 0.8, it means that the pumping system is in a high-efficiency operation state and no optimization is required; if the value of any of the six-node efficiency factors is between 0.6 and 0.8, it means that the pumping system is in a medium-efficiency operation state, and whether to optimize and adjust can be independently selected according to the on-site economic conditions;

[0071] When the value of any of the six-node efficiency factors is less than 0.6, it means that the pumping system is in an inefficient operating state and corresponding optimization measures are needed.

[0072] It can be seen from the radar chart that the dragging system, the oil pump and the rod and pipe of the embodiment need to be further improved, and corresponding optimization measures can be adopted to improve the efficiency of the oil pumping well system.

[0073] The present invention provides a method for analyzing the efficiency potential of a pumping well system based on six-node efficiency factors. By calculating the efficiency factors of the six nodes of the pumping well, the operating potential status of each node of the pumping well can be accurately and quickly evaluated, and the optimization direction for improving the system efficiency of the pumping well can be pointed out.

[0074] The above implementation modes are only used to illustrate the present invention, but not to limit the present invention. Ordinary technicians in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions also belong to the scope of the present invention. The patent protection scope of the present invention should be defined by the claims.

Claims

1. A method for analyzing the efficiency potential of a pumping well system based on six-node efficiency factors, characterized in that: include: Step S1, obtaining the operating parameters of the pumping well; Step S2, calculating six-node efficiency factors of the oil well pumping system through operating parameters; wherein the six-node efficiency factors include: drag device efficiency factor, oil well pumping unit efficiency factor, packing box efficiency factor, rod and pipe efficiency factor, gas expansion efficiency factor and oil well pump efficiency factor; Step S3, constructing a six-node efficiency factor radar chart of the pumping well according to the six-node efficiency factors calculated in step S2; Step S4, evaluating the efficiency potential of the pumping well system according to the six-node efficiency factor radar map, and guiding subsequent optimization measures according to the six-node efficiency factor radar map; The calculation formula of the drag device efficiency factor is: Where: is the efficiency factor of the traction device; α test is the measured load rate of the dragging device; α ideal is the ideal drag device load rate; is the average power; p e is the rated power; k1 is the correction factor of the traction device; Wherein, the calculation formula of the pumping unit efficiency factor is: β ideal ＝k2·80％ Where: is the pumping unit efficiency factor; β test is the measured current balance; β ideal is the ideal current balance; γ text is the belt tension test value; γ ideal is the ideal value of belt tension; I max1 is the peak current of the upstroke; I max2 is the peak current of the downstroke; k2 is the correction coefficient of the pumping unit.

2. The method for analyzing the efficiency potential of a pumping well system based on six-node efficiency factors according to claim 1, characterized in that: The packing box efficiency factor calculation formula is: Where: is the packing box efficiency factor; N test is the measured torque value of the packing box; N ideal It is the ideal torque value of packing box.

3. The method for analyzing the efficiency potential of a pumping well system based on six-node efficiency factors according to claim 1, characterized in that: The calculation formula of the rod-tube efficiency factor is: Where: is the rod efficiency factor; σ test is the measured maximum stress of the pole column; [σ] is the allowable stress of the pole column; k3 is the correction coefficient of the pole column.

4. The method for analyzing the efficiency potential of a pumping well system based on six-node efficiency factors according to claim 1, characterized in that: The gas expansion efficiency factor calculation formula is: Where: is the gas expansion efficiency factor; p test is the measured wellhead pressure; p ideal is the ideal wellhead back pressure; k4 is the pressure correction coefficient.

5. The method for analyzing the efficiency potential of a pumping well system based on six-node efficiency factors according to claim 1, characterized in that: The oil well pump efficiency factor calculation formula is: Where: is the oil well pump efficiency factor; h test is the measured sinking degree; h ideal is the ideal submergence; k5 is the submergence correction coefficient.

6. The method for analyzing the efficiency potential of a pumping well system based on six-node efficiency factors according to claim 1, characterized in that: If the values ​​of the six-node efficiency factors are all greater than 0.8, it means that the pumping system is in a highly efficient operation state and no optimization is required; If any of the six-node efficiency factors is between 0.6 and 0.8, it means that the pumping system is in a medium-efficiency operation state, and whether to optimize and adjust it can be determined based on the on-site economic conditions. When the value of any of the six-node efficiency factors is less than 0.6, it means that the pumping system is in an inefficient operating state and optimization measures are needed.

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