CN111350477B - Method for determining potential interval for improving efficiency of water injection system - Google Patents
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Abstract
The invention discloses a method for determining a potential interval for improving the efficiency of a water injection system, and belongs to the technical field of oil and gas field development. The method for determining the interval for improving the efficiency potential of the water injection system determines whether the functional relationship exists between the efficiency of the water injection system and the attributes by determining the efficiency of a plurality of groups of water injection systems, the pipe network efficiency, the pump efficiency, the average single-well oil pressure, the pump pressure, the motor load rate, the sum of the water volumes of the single well and the ratio of the pump pressure to the average single-well oil pressure of a plurality of water injection stations at different moments, if the functional relationship exists, a first function curve taking the efficiency of the water injection system as a dependent variable is obtained by fitting, obtaining a first division point according to the first function curve, obtaining a trend straight line according to the first function curve and the first division point, and determining a potential interval for improving the efficiency of the water injection system corresponding to the independent variable of the first function curve according to the trend straight line and the second division point so as to adjust a water injection scheme and achieve the purpose of improving the efficiency of the water injection system.
Description
Technical Field
The invention relates to the technical field of oil and gas field development, in particular to a method for determining a potential interval for improving the efficiency of a water injection system.
Background
As various large oil fields in China enter the middle and later development stages, the development of the oil fields mainly takes water injection development as the main development. In the process of water injection development, the power consumption of a water injection system is large and accounts for about 20% -40% of the total power consumption of an oil field, the comprehensive water content is continuously increased along with the continuous promotion of the oil field development, and the energy consumption of water injection is further increased. Therefore, how to save energy and reduce consumption of the oilfield water injection system, improve the efficiency of the water injection system and reduce the production cost of the oilfield becomes an important subject for various large oilfields.
At present, an analysis method for the efficiency of a water injection system mainly depends on collecting values of all parameters influencing water injection energy consumption from a single water injection station, and the values of all the parameters are respectively substituted into an energy consumption calculation formula for calculation and analysis so as to adjust the values of the parameters and improve the efficiency of the water injection system.
The existing formula analysis method has single selected parameter and is difficult to perform comprehensive analysis, and particularly, when the data with large data volume is calculated and analyzed, the time spent is long, the calculation efficiency is low, and the production requirement is difficult to meet; meanwhile, a plurality of different types of data can be obtained at present, and the formula analysis method can only utilize a plurality of specific types of data, so that a lot of valuable data cannot be utilized.
Disclosure of Invention
In view of this, the present invention provides a method for determining a potential interval for improving the efficiency of a water injection system, which combines a large amount of data to determine main factors affecting the efficiency of the water injection system and the potential interval corresponding thereto for improving the efficiency of the water injection system, so as to facilitate guidance of actual production operations.
Specifically, the method comprises the following technical scheme:
a method for determining potential intervals for improving efficiency of a water injection system is characterized by comprising the following steps:
determining whether a functional relation exists between the water injection system efficiency and the pipe network efficiency and/or the pump-driving efficiency and/or the average single-well oil pressure and/or the pump pressure and/or the motor load rate and/or the sum of the single-well water volumes and/or the ratio of the pump pressure to the average single-well oil pressure or not according to the water injection system efficiency, the pipe network efficiency, the pump-driving efficiency, the average single-well oil pressure, the sum of the single-well water volumes and the ratio of the pump pressure to the average single-well oil pressure of a plurality of water injection stations at different moments;
if a functional relation exists between the water injection system efficiency and the pipe network efficiency and/or the pump-motor efficiency and/or the average single well oil pressure and/or the pump pressure and/or the motor load rate and/or the sum of the single well water volume and/or the ratio of the pump pressure to the average single well oil pressure, fitting to obtain a first function curve taking the water injection system efficiency as a dependent variable;
obtaining a first division point according to the first function curve;
obtaining a trend straight line according to the first function curve and the first dividing point;
obtaining a second division point according to the trend straight line;
and determining the efficiency potential interval of the water injection system corresponding to the independent variable of the first function curve according to the trend straight line and the second division point.
Optionally, before determining whether a functional relationship exists between the water injection system efficiency and the pipe network efficiency and/or the pump-in-line efficiency and/or the average single-well oil pressure and/or the pump pressure and/or the motor load rate and/or the sum of the single-well water volumes and/or the pump pressure and/or the average single-well oil pressure ratio according to the plurality of groups of water injection system efficiencies, pipe network efficiencies, pump-in-line efficiencies, average single-well oil pressures, pump pressures, motor load rates, the sum of the single-well water volumes, and pump pressures at different times of the plurality of water injection stations, and the ratio of the pump pressures to the average single-well oil pressure, the method further comprises: the method comprises the steps of obtaining multiple groups of water injection unit consumption, water injection standard unit consumption, pump efficiency, average single well oil pressure, pump pressure, water injection system efficiency, motor load rate, sum of single well water quantities, pipe network efficiency and ratio of pump pressure to average single well oil pressure of a plurality of water injection stations at different moments.
Optionally, the first division point is a point corresponding to one half or one third and two thirds of a maximum value of the argument on the first function curve.
Optionally, the obtaining a second dividing point according to the trend straight line specifically includes: and making extension lines for the trend straight lines, and if intersection points exist between two adjacent trend straight lines or the extension lines of the trend straight lines, taking a point on the first function curve corresponding to the abscissa of the intersection point as a second division point.
Optionally, the determining, according to the trend straight line and the second division point, the water injection system efficiency improvement potential interval corresponding to the independent variable of the first function curve specifically includes: and dividing a plurality of intervals according to the origin, the maximum value taking point of the independent variable and the point corresponding to the abscissa of the second division point, comparing the absolute value of the slope of the trend straight line in each interval, and determining the interval in which the absolute value of the slope with the maximum value is positioned as the efficiency potential interval of the independent variable for improving the water injection system.
Optionally, the method for determining the functional relationship includes: grey correlation, normal distribution and cluster analysis.
The technical scheme provided by the embodiment of the invention has the beneficial effects that:
determining whether a functional relation exists between the efficiency of the water injection system and the efficiency of the pipe network and/or the pump-driven efficiency and/or the average oil pressure of the single well and/or the pump pressure and/or the load rate of the motor and/or the sum of the water amount of the single well and/or the ratio of the pump pressure to the average oil pressure of the single well for a plurality of groups of water injection system, pipe network efficiency, pump-driven efficiency, average oil pressure of the single well, pump pressure, motor load rate and/or water amount of the single well of a plurality of water injection stations at different moments, if a functional relation exists between the efficiency of the water injection system and the efficiency of the pipe network and/or the pump-driven efficiency and/or the average oil pressure of the single well and/or the ratio of the pump pressure to the average oil pressure of the single well, then fitting a first function curve with the efficiency of the water injection system as a dependent variable is obtained, the method comprises the steps of obtaining a first division point according to a first function curve, obtaining a trend straight line according to the first function curve and the first division point, obtaining a second division point according to the trend straight line, determining an efficiency potential interval of the water injection system corresponding to an independent variable of the first function curve according to the trend straight line and the second division point, and adjusting a water injection scheme according to the water injection unit consumption potential interval, so that the purpose of improving the efficiency of the water injection system can be achieved, and practical production operation can be guided conveniently.
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In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart of a method for determining a potential interval for improving efficiency of a water injection system according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the following will describe embodiments of the present invention in further detail with reference to the accompanying drawings.
The embodiment of the invention provides a method for determining a potential interval for improving the efficiency of a water injection system, which takes 15 water injection stations and 357 water injection wells of a certain oil production plant in an oil field in North China as an example, and the flow chart of the method is shown in figure 1, and the method comprises the following steps:
step 101: and determining whether a functional relation exists between the efficiency of the water injection system and the pipe network efficiency and/or the pump-driving efficiency and/or the average single-well oil pressure and/or the pump pressure and/or the efficiency of the water injection system and/or the load rate of the motor and/or the sum of the water volumes of the single well and/or the ratio of the pump pressure to the average single-well oil pressure or not according to the efficiency of a plurality of groups of water injection systems, the pipe network efficiency, the pump-driving efficiency, the average single-well oil pressure, the sum of the water volumes of the single well and the ratio of the pump pressure to the average single-well oil pressure of a plurality of water injection stations at different moments.
Before the step, firstly, acquiring multiple groups of water injection unit consumption, water injection standard unit consumption, motor pump efficiency, average single well oil pressure, pump pressure, water injection system efficiency, motor load rate, sum of water volumes of single wells, pipe network efficiency and ratio of pump pressure to average single well oil pressure of a plurality of water injection stations at different moments through data acquisition.
In the embodiment of the invention, 20 ten thousand groups of data can be obtained by data acquisition of 15 water injection stations and 357 water injection wells.
The method comprises the steps of analyzing the correlation between the efficiency of a water injection system and pipe network efficiency, the pump efficiency, the average single well oil pressure, the pump pressure, the motor load rate, the sum of the single well water amount and the ratio of the pump pressure to the average single well oil pressure, and determining whether a functional relation exists between the efficiency of the water injection system and the attributes by utilizing a determination method of various functional relations such as grey correlation, normal distribution, cluster analysis and the like.
Step 102: and if a functional relation exists between the efficiency of the water injection system and the pipe network efficiency and/or the pump efficiency and/or the average single well oil pressure and/or the sum of the pump pressure and/or the motor load rate and/or the water volume of the single well and/or the ratio of the pump pressure to the average single well oil pressure, fitting to obtain a first function curve taking the efficiency of the water injection system as a dependent variable.
Wherein, the functional relation between the efficiency of the water injection system and the pipe network efficiency, the pump efficiency, the average single well oil pressure, the pump pressure, the motor load rate, the sum of the single well water amount and the ratio of the pump pressure to the average single well oil pressure is determined one by one to obtain 3 regular functions, and a corresponding curve (not shown in the figure) is drawn.
Wherein, (1) the efficiency of a water injection system and the efficiency of a pipe network
A linear function relation exists between the efficiency of the water injection system and the efficiency of the pipe network: y is 0.577x +12.52, R2That is, the higher the pipe network efficiency, the higher the water injection system efficiency.
(2) Ratio of water injection system efficiency to pump pressure to average individual well oil pressure
The water injection system efficiency and the ratio of the pumping pressure to the average single well oil pressure are in a polynomial function relation: y 22.75x2-97.60x+143.8，R2That is, the greater the pump pressure to average single well oil pressure ratio, the less efficient the water injection system is.
(3) Water injection system efficiency and pump efficiency
The water injection system efficiency and the pump efficiency are in a linear function relationship: y 0.598x +12.05, R2That is, the higher the pump efficiency, the higher the water injection system efficiency.
Step 103: and obtaining a first division point according to the first function curve.
The first division point is a point corresponding to one half or one third and two thirds of the maximum value of the independent variable on the first function curve.
Step 104: and obtaining a trend straight line according to the first function curve and the first dividing point.
And respectively making trend straight lines on the first function curves at two ends of the first division point by taking the first division point as a dividing point to obtain two or three trend straight lines.
Step 105: and obtaining a second division point according to the trend straight line.
And if the adjacent two trend straight lines or the extension lines of the trend straight lines have an intersection point, taking a point on the first function curve corresponding to the abscissa of the intersection point as a second division point.
Step 106: and determining the efficiency potential interval of the water injection system corresponding to the independent variable of the first function curve according to the trend straight line and the second division point.
And determining the interval where the absolute value of the slope with the maximum value is located as the efficiency potential interval of the independent variable for improving the water injection system.
Through comparative analysis, in the embodiment of the invention, 3 relevant potential intervals for improving the efficiency of the water injection system can be obtained: the efficiency of the water injection system is improved by the pipe network efficiency, and the potential interval is (0, 0.68); the potential interval of the efficiency of the water injection system is (0, 1.4) for improving the ratio of the pump pressure to the average single-well oil pressure; the potential interval of the efficiency of the water injection system for improving the efficiency of the pump is (0, 0.69).
To verify the validity of the results, the method is performed by taking 14 of the 2016 year 357 water injection wells as an example, and the following table 1 shows a statistical table of water injection energy consumption of the 14 water injection wells:
TABLE 1 statistical table of water injection energy consumption
It can be seen that the ratio of the pump pressure to the average single-well oil pressure is greater than 1.4, and three water injection stations with the pipe network efficiency less than 68% are respectively a 1# station, a 2# station and a 3# pressurizing station. The method mainly adopts the method of shutting down the 3# pressurizing station, subdividing the 2# station high-low pressure water injection system and reducing the pressure of the 1# water injection station high-pressure water injection well by an acidification single well, so that the annual energy saving reaches 132 ten thousand kilowatt hours, and the purpose of improving the efficiency of the water injection system is realized.
The method for determining the potential interval for improving the efficiency of the water injection system comprises the steps of determining whether a functional relation exists between the efficiency of the water injection system and the efficiency of a pipe network and/or the pumping efficiency and/or the average oil pressure of a single well and/or the motor load rate and/or the sum of the water amount of the single well and/or the ratio of the pumping pressure to the average oil pressure of the single well by using a plurality of groups of water injection system efficiencies, pipe network efficiencies, pumping efficiencies, average oil pressures of the single well, pumping pressures, motor load rates, the sum of the water amount of the single well and/or the ratio of the pumping pressure to the average oil pressure of the single well of a plurality of water injection stations at different moments, the method comprises the steps of obtaining a first function curve with water injection system efficiency as a dependent variable through fitting, obtaining a first division point according to the first function curve, obtaining a trend straight line according to the first function curve and the first division point, obtaining a second division point according to the trend straight line, determining an efficiency potential interval of the water injection system corresponding to the independent variable of the first function curve according to the trend straight line and the second division point, and adjusting a water injection scheme according to the water injection unit consumption potential interval.
The above description is only for facilitating the understanding of the technical solutions of the present invention by those skilled in the art, and is not intended to limit the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. A method for determining potential intervals for improving efficiency of a water injection system is characterized by comprising the following steps:
determining whether a functional relation exists between the efficiency of a water injection system and the efficiency of a pipe network and/or the efficiency of a pump, and/or the average oil pressure of a single well and/or the sum of the pump pressure and/or the motor load rate and/or the water volume of the single well and/or the ratio of the pump pressure to the average oil pressure of the single well according to the efficiency of a plurality of groups of water injection systems, the efficiency of the pipe network, the efficiency of the pump, the sum of the water volume of the single well and the ratio of the pump pressure to the average oil pressure of the single well at different moments of a plurality of water injection stations;
if a functional relation exists between the water injection system efficiency and the pipe network efficiency and/or the pump-motor efficiency and/or the average single well oil pressure and/or the pump pressure and/or the motor load rate and/or the sum of the single well water volume and/or the ratio of the pump pressure to the average single well oil pressure, fitting to obtain a first function curve taking the water injection system efficiency as a dependent variable;
obtaining a first division point according to the first function curve; the first division point is a point corresponding to one half or one third and two thirds of the maximum value of the independent variable on the first function curve;
obtaining a trend straight line according to the first function curve and the first dividing point;
making extension lines for the trend straight lines, and if intersection points exist between two adjacent trend straight lines or the extension lines of the trend straight lines, taking a point on the first function curve corresponding to the abscissa of the intersection point as a second division point;
and dividing a plurality of intervals according to the origin, the maximum value taking point of the independent variable and the point corresponding to the abscissa of the second division point, comparing the absolute value of the slope of the trend straight line in each interval, and determining the interval where the absolute value of the slope with the maximum value is located as the water injection system efficiency improvement potential interval of the independent variable.
2. The method for determining the interval for increasing the efficiency potential of a water injection system according to claim 1, wherein before determining whether the water injection system efficiency is in functional relationship with the pipe network efficiency and/or the pump efficiency and/or the average single well oil pressure and/or the pump pressure and/or the motor load rate and/or the sum of the single well water volumes and/or the ratio of the pump pressure to the average single well oil pressure according to the plurality of groups of water injection system efficiencies, pipe network efficiencies, pump pumping efficiencies, average single well oil pressures, pump pressures, motor load rates, sum of the single well water volumes, and ratio of the pump pressures to the average single well oil pressures of the plurality of water injection stations at different time, the method further comprises: the method comprises the steps of obtaining multiple groups of water injection unit consumption, water injection standard unit consumption, pump efficiency, average single well oil pressure, pump pressure, water injection system efficiency, motor load rate, sum of single well water quantities, pipe network efficiency and ratio of pump pressure to average single well oil pressure of a plurality of water injection stations at different moments.
3. The method for determining the interval for improving the efficiency potential of the water injection system according to claim 1, wherein the method for determining the functional relationship comprises: grey correlation, normal distribution and cluster analysis.
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