CN112360446A - Method for judging gas well type based on gas well production dynamic index system - Google Patents
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Abstract
The invention provides a method for judging the type of a gas well based on a gas well production dynamic index system, which comprises the following steps: establishing a production dynamic index system; drawing a scatter diagram by using parameters of a production dynamic index system; selecting a scatter diagram of a distribution rule and dividing the scatter diagram into three areas, namely a type I well, a type II well and a type III well; drawing the production dynamic parameters of the type I well, the type II well and the type III well as radar maps; and acquiring the production dynamic parameters of the target gas well of the type to be judged, and searching the type of the gas well in the radar map. The method comprehensively considers the influence of multiple production dynamic indexes of the gas well, can more scientifically evaluate the production capacity of the gas well in the middle and later periods of production, and provides a reliable basis for selecting proper drainage and gas production measures for the gas well.
Description
Technical Field
The invention belongs to the field of natural gas development, and particularly relates to a method for judging the type of a gas well based on a gas well production dynamic index system.
Background
In the process of natural gas exploitation, gathering and transportation, in order to facilitate the production management of gas wells, gas wells are generally divided into I, II and III wells according to the production capacity of the gas wells, and at present, the most common classification methods for gas wells at home and abroad are two methods: the method comprises the steps of classifying gas wells according to the thickness of a reservoir, belonging to a static evaluation method, wherein the effect of gas well modification has a large influence on gas production of a gas reservoir, the classification based on the thickness of the gas well obviously has limitations, and the reservoir parameters sometimes cannot truly reflect the actual capacity of the gas well after modification. Secondly, classifying the gas wells according to the calculated gas well unobstructed flow after reservoir transformation, belonging to a dynamic evaluation method, wherein the method is to adopt a one-point method to test and calculate the unobstructed flow before production, which reflects the seepage characteristics of a near-well stratum fracturing fracture zone in the initial production stage, but with the production of the gas wells, the matrix reservoir energy in a far-well area is used, and the production capacity of the gas wells is more real at the moment, so that the dynamic evaluation method cannot comprehensively evaluate the gas wells.
In addition, the gas well indexes adopted by the traditional classification method are single, and the influence degree of different production indexes of the gas well on different gas wells is not considered, so that the problem that the classification is inaccurate or the actual production performance is not consistent is solved. For example: (1) the system comprises Su-6-91 wells, a perforation well section, a first well section, a second well section and a second well section, wherein the first well section is 3230-3234m, and the effective thickness of a reservoir layer is 4.3 m; the perforating well section 3201 and 3207m, and the effective thickness of the reservoir is 7.0 m. The well adopts reservoir parameters to evaluate as a type I well; but the well tested for production before production was 0.84X 104m3D, however, the unimpeded flow rate calculated by the one-point test was 2.12X 104m3D, can only be evaluated as class IIIThe well, namely the productivity condition after modification is not consistent with the static evaluation result, so that the reservoir parameters cannot truly reflect the actual productivity of the gas well after modification. (2) A peach-21-84 well with a non-resistance flow rate of 20.45X 10 before production4m3And d, classifying the well into a type I well according to the unimpeded flow evaluation standard, and the well head casing pressure is 24.0MPa when the well is opened for production, and the daily gas production is 2.2 multiplied by 104m3The output characteristics of the I type well at the initial production stage are met; but the well yield and pressure drop rapidly, the well head sleeve pressure drops to 7.4MPa when the well is produced for 174 days, and the daily gas production drops to 0.2 multiplied by 104m3D; obviously, the non-resistance flow evaluation result is not consistent with the real production dynamic.
Therefore, neither the static evaluation method nor the dynamic evaluation method can accurately evaluate the gas well, resulting in a gas well classification deviation.
Disclosure of Invention
The invention aims to provide a method for judging the type of a gas well based on a gas well production dynamic index system, so as to overcome the technical defects.
In order to solve the technical problem, the invention provides a method for judging the type of a gas well based on a gas well production dynamic index system, which comprises the following steps:
s001, establishing a production dynamic index system;
s002, drawing a scatter diagram by using parameters of a production dynamic index system;
s003, selecting a scatter diagram with a distribution rule and dividing the scatter diagram into three areas, namely a type I well, a type II well and a type III well;
s004, drawing the production dynamic parameters of the type I well, the type II well and the type III well into radar maps;
and S005, acquiring the production dynamic parameters of the target gas well of the type to be judged and searching the type of the gas well in the radar map.
Further, the step S001 of establishing a production dynamic index system specifically means obtaining the following production dynamic parameters:
the daily gas production rate at the initial stage of production;
the gas production is accumulated in n years after the operation;
the gas production rate in the nth hundred days;
peak daily gas production;
average daily gas production at the nth year stage;
annual daily gas production rate;
casing pressure at the initial stage of production;
pressing on the nth hundred days;
peak value casing pressure;
average casing pressure in the nth year stage;
annual rate of reduction of casing pressure;
gas is produced by unit set pressure drop in the nth year;
wherein n is a positive integer.
Preferably, the step S002 of drawing a scattergram by using parameters of a dynamic index system includes the following steps:
optionally selecting two parameters from the production dynamic parameters at a time;
drawing a scatter diagram with one parameter as an X axis and the other parameter as a Y axis;
and continuously repeating the steps until all the production dynamic parameters are drawn in the scatter diagram.
Further, in step S003, the scatter diagram of the distribution rule is selected and divided into three regions, i.e., a type i well, a type ii well, and a type iii well, specifically, the following are selected:
viewing all scatter diagrams;
selecting a scatter diagram with concentrated gas well distribution positions and rising trend as a scatter diagram of a distribution rule;
two horizontal lines parallel to an X axis and two vertical lines parallel to a Y axis are made in a scatter diagram of the distribution rule, six lines including the X axis and the Y axis are staggered with each other to form a nine-grid, each line is finely adjusted to enable the nine-grid to cover all gas wells, then a diagonal line is made by taking an original point as a starting point, and a grid area where the diagonal line passes is sequentially a type I well, a type II well and a type III well, wherein an area where the type III well is located is a grid where the original point is located.
Preferably, in step S004, the dynamic production parameters of the type i well, the type ii well and the type iii well are plotted as radar maps, specifically:
collecting a scatter diagram of the distribution rule;
classifying all gas wells in the scatter diagram with the distribution rule;
and respectively recording the boundary parameters of the production dynamic parameters of all the type I wells, all the type II wells and all the type III wells, compiling a gas field type division standard table, and drawing a radar map according to the table.
Further, in step S005, the obtaining of the production dynamic parameter of the target gas well of the type to be determined and the searching of the gas well type in the radar map include:
acquiring the daily gas production rate of a target gas well at the initial production period, the accumulated gas production rate of the target gas well in n years of production, the n hundred-day daily gas production rate, the average daily gas production rate at the nth year stage and the accumulated gas production rate of the unit set pressure drop in the nth year, wherein n is the maximum value;
searching the five parameters in the steps in the radar map, and searching the area in which each parameter falls;
and determining the area containing the most parameters as the type of the gas well of the target gas well.
Further, the method for determining the type of the gas well based on the gas well production dynamic index system further comprises a step S006, which comprises the following specific steps:
s601, setting the weight of the daily gas production rate at the initial stage of the operation as P1, the weight of the accumulated gas production rate in n years of the operation as P2, the weight of the daily gas production rate in the nth hundred days as P3, the weight of the average daily gas production rate in the nth year stage as P4 and the weight of the accumulated gas production rate in the unit set pressure drop in the nth year as P5, wherein P1+ P2+ P3+ P4+ P5 is 100%;
s602, calculating the type of the target gas well by using the following formula:
X1×P1+X2×P2+X3×P3+X4×P4+X5×P5
wherein:
x1 is the gas well type to which the daily gas production at the initial stage of production belongs, which is determined by using a radar map;
x2 is the type of gas well to which the n-year cumulative gas production on stream is determined using a radar map;
x3 is the gas well type to which the gas production rate on the nth hundred days determined by the radar chart belongs;
x4 is the gas well type to which the average daily gas production in the nth year stage determined by the radar map belongs;
x5 is the gas well type to which the unit set pressure drop accumulated gas in the nth year belongs, which is determined by using a radar map;
the gas well type is a type I well, a type II well or a type III well;
and S603, merging the gas wells of the same type in the formula S602, comparing the numerical values of the gas wells of the same type, and determining the gas well type with the maximum numerical value as the target gas well type.
The invention has the following beneficial effects:
the method for judging the type of the gas well based on the gas well production dynamic index system comprehensively considers the influence of multiple production dynamic indexes of the gas well, can more scientifically evaluate the production capacity of the gas well in the middle and later periods of production, provides a reliable basis for selecting proper drainage and gas production measures for the gas well, performs primary judgment and secondary judgment on the type of the gas well, wherein the primary judgment is realized by using a radar map, the secondary judgment is realized according to given weights, and in the judgment process, 5 indexes with the largest influence in the gas well production dynamic state are selected, so that the method is simple, reliable, strong in operability and high in judgment accuracy.
In order to make the aforementioned and other objects of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
FIG. 1 is a flow chart of a method for determining a gas well type based on a gas well production dynamic index regime.
Fig. 2 is a graph of daily gas production at the initial stage of production to peak daily gas production.
FIG. 3 is a graph of daily gas production at the initial stage of production versus annual rate of decline in daily gas production.
FIG. 4 is a graph of initial daily gas production at start of production versus stack pressure on day 300.
Fig. 5 is a graph of average daily gas production over the 2 nd year period versus average casing pressure over the 2 nd year period.
FIG. 6 is a graph of the cumulative gas production per unit of set pressure drop at day 300 versus year 1.
FIG. 7 is a graph of the gas production by the load of 1 year on stream versus the cuff pressure on day 300.
Fig. 8 is a daily gas yield at the initial stage of production-daily gas yield at the initial stage of production.
Fig. 9 is a graph of peak daily gas production versus peak casing pressure.
FIG. 10 is a graph of daily gas production on day 300 versus cuff pressure on day 300.
FIG. 11 is a graph showing the relationship between the daily gas production at the initial stage of the operation and the cumulative gas production for 3 years of the operation.
FIG. 12 is a graph showing the relationship between the initial daily gas production on startup and the daily gas production on day 900.
Fig. 13 is a graph showing the relationship between the initial daily gas production rate and the average daily gas production rate at the 3 rd year stage.
FIG. 14 is a graph of the daily gas production at the initial stage of commissioning versus the cumulative gas production per three years unit of pressure drop.
FIG. 15 is a gas well type division.
Fig. 16 is a radar chart.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
In the present invention, the top, bottom, left and right in the drawings are regarded as the top, bottom, left and right of the method for determining the type of the gas well based on the gas well production dynamic index system described in the present specification.
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
The first embodiment:
the embodiment relates to a method for judging the type of a gas well based on a gas well production dynamic index system, which comprises the following steps:
s001, establishing a production dynamic index system;
s002, drawing a scatter diagram by using parameters of a production dynamic index system;
s003, selecting a scatter diagram with a distribution rule and dividing the scatter diagram into three areas, namely a type I well, a type II well and a type III well;
s004, drawing the production dynamic parameters of the type I well, the type II well and the type III well into radar maps;
and S005, acquiring the production dynamic parameters of the target gas well of the type to be judged and searching the type of the gas well in the radar map.
In the field of natural gas exploitation, gas wells are divided into I, II and III types of wells according to the production capacity of the gas wells, generally speaking, the I type of gas wells are good in production liquid carrying capacity, drainage and production measures are not needed in the early production period of well opening, and a speed tubular column drainage and gas production process can be preferentially selected in the middle production period; the type II gas well can be put into a speed pipe column for production at an early stage, the speed pipe column can be taken out in the middle and later stages of production, and the plunger gas lift liquid drainage production is put in; the III-type gas well can be directly put into plunger production.
The production dynamic index is data reflecting the production characteristics of the gas wells, and can reflect the production capacity of each gas well to the greatest extent, so the production dynamic indexes of a plurality of gas wells are required to be collected as the basis of the establishing method, if 12 production dynamic indexes are obtained, a scatter diagram is drawn from any two parameters (production dynamic indexes) until all the parameters participate in the scatter diagram, then the trend of each scatter diagram is observed, the scatter diagram with a distribution rule is selected, for example, the trend is increased and the data is concentrated, the scatter diagrams are divided into three areas, each area respectively corresponds to a type I well, a type II well and a type III well, and at the moment, the first step of the judging method is completed.
The second step of the decision method is to convert the above into other maps that clearly classify the gas well type, such as radar maps.
And the third step is the final application of the method, namely, the production dynamic parameters of the target gas well of the type to be judged are obtained firstly, then each production dynamic parameter is searched in the radar map, the area of the radar map where each production dynamic parameter falls is determined, the gas well type of the target gas well can be further determined, if each production dynamic parameter falls into different areas of the radar map, the number of the production dynamic parameters falling into the same area is compared, and the gas well type of the target gas well is determined if the number of the production dynamic parameters is the largest.
It is noted that data from multiple gas wells is collected as much as possible to improve the accuracy of the determination method.
The acquisition of the production dynamic index is obtained by a conventional method in the field of oilfield exploitation and is not described herein.
Second embodiment:
the embodiment relates to a method for judging the type of a gas well based on a gas well production dynamic index system, and the method is shown in figure 1 and comprises the following steps:
s001, establishing a production dynamic index system, specifically, obtaining the following production dynamic parameters:
the daily gas production rate at the initial stage of production;
the gas production is accumulated in n years after the operation;
the gas production rate in the nth hundred days;
peak daily gas production;
average daily gas production at the nth year stage;
annual daily gas production rate;
casing pressure at the initial stage of production;
pressing on the nth hundred days;
peak value casing pressure;
average casing pressure in the nth year stage;
annual rate of reduction of casing pressure;
gas is produced by unit set pressure drop in the nth year;
wherein n is a positive integer.
Table 1 below illustrates the production dynamics described above with reference to actual production data for five gas wells.
Table 1 dynamic parameter example table
As can be seen from table 1, in addition to the 12 production dynamic indicators listed in step S001, table 1 also provides n years of parameters such as cumulative gas production per unit pressure drop, days of production less than 3000, days of production from 3000 to 5000, days of production from 5000 to 8000, and days of production over 8000, that is, the present invention is not limited to the listed parameters, but may also be other production dynamic indicators, and considering that the parameters cannot be exhausted, the 12 production dynamic indicators in step S001 are preferred, and similarly, table 1 only shows the production dynamic indicators of five gas wells, but in order to improve the determination accuracy, twenty, one hundred, and so on are also possible, without limitation.
S002, drawing a scatter diagram by using parameters of a dynamic index system, wherein the parameters comprise the following contents:
optionally selecting two parameters from the production dynamic parameters at a time;
drawing a scatter diagram with one parameter as an X axis and the other parameter as a Y axis;
and continuously repeating the steps until all the production dynamic parameters are drawn in the scatter diagram.
As shown in fig. 2-10, which are partial scatter diagrams having no obvious regularity, points corresponding to different types of gas wells are scattered, and each scatter diagram in fig. 11-14 presents the characteristic that distribution positions are concentrated and trend to rise, that is, the distribution positions of the gas wells are concentrated and rise sequentially as the daily gas production rate at the initial stage of production increases.
S003, selecting a scatter diagram with a distribution rule and dividing the scatter diagram into three areas, namely a type I well, a type II well and a type III well, and specifically comprising the following steps:
viewing all scatter diagrams;
selecting a scatter diagram with concentrated gas well distribution positions and rising trend as a scatter diagram of a distribution rule;
two horizontal lines parallel to an X axis and two vertical lines parallel to a Y axis are made in a scatter diagram of the distribution rule, six lines including the X axis and the Y axis are staggered with each other to form a nine-grid, each line is finely adjusted to enable the nine-grid to cover all gas wells, then a diagonal line is made by taking an original point as a starting point, and a grid area where the diagonal line passes is sequentially a type I well, a type II well and a type III well, wherein an area where the type III well is located is a grid where the original point is located.
Taking the relation graph of the gas production rate at the initial stage of production and the gas production rate accumulated in 3 years of production as an example shown in fig. 11, how to determine the type of the gas well is explained, and the method for delineating the category of the gas well is described in detail (see fig. 15):
firstly, drawing a horizontal line I parallel to an X axis, drawing a vertical line II parallel to a Y axis, wherein the horizontal line I, the vertical line II, the X axis and the Y axis are intersected and enclosed by four straight lines to enclose all wells;
then drawing a parallel line-a horizontal line and a horizontal line, a parallel line-a vertical line and a vertical line of a vertical line until the number of wells in a closed rectangular I area, a closed rectangular II area and a closed rectangular III area formed by intersecting the six straight lines reaches the maximum, and then, the type III wells are mainly positioned at the left lower part of the graph, the type II wells are mainly positioned at the middle part of the graph, and the type I wells are mainly positioned at the right upper part of the graph.
And repeating the method for delineating the gas well categories to classify the scatter diagrams of all the distribution rules by delineating.
According to the method, the Suliger gas well is divided and classified, and the division standard table is as follows:
TABLE 2 Suliger gas well type division Standard Table
As shown in fig. 2, 5 main parameters of 12 production dynamic index types are selected, which are daily gas production at the initial stage of production, cumulative gas production at n years of production, daily gas production at n hundred days of production, daily gas production at the average stage of n years, and cumulative gas production at unit pressure drop per unit of n years, where n is the maximum value, and the selection of the 5 main parameters is the key division parameter provided by the present invention, but not limited thereto, and other parameters may also be selected by using the determination method of the present invention.
S004, drawing the production dynamic parameters of the type I well, the type II well and the type III well into radar maps, specifically:
collecting a scatter diagram of the distribution rule;
classifying all gas wells in the scatter diagram with the distribution rule;
respectively recording the production dynamic parameters of all the type I wells, all the type II wells and all the type III wells, drawing a radar chart, specifically recording the boundary parameters of the production dynamic parameters, compiling a gas field type division standard table (table 2), and drawing the radar chart according to the table, which is shown in figure 16.
S005, obtaining the production dynamic parameters of the target gas well of the type to be judged and searching the type of the gas well in the radar map, wherein the method specifically comprises the following steps:
acquiring the daily gas production rate of a target gas well at the initial production period, the accumulated gas production rate of the target gas well in n years of production, the n hundred-day daily gas production rate, the average daily gas production rate at the nth year stage and the accumulated gas production rate of the unit set pressure drop in the nth year, wherein n is the maximum value;
searching the five parameters in the steps in the radar map, and searching the area in which each parameter falls;
and determining the area containing the most parameters as the type of the gas well of the target gas well.
For example, 3 of five parameters of a target gas well fall into a type I well area of a radar chart, and the other two parameters fall into a type II well area and a type III well area, so that the target gas well is evaluated as a type I well, the production liquid carrying capacity of the well is better, drainage and production measures are not needed in the early production period of well opening, and a speed tubular column drainage and gas production process can be preferentially selected in the middle production period.
The third embodiment:
the embodiment relates to a method for judging the type of a gas well based on a gas well production dynamic index system, which comprises the following steps:
s001, establishing a production dynamic index system, specifically, obtaining the following production dynamic parameters:
the daily gas production rate at the initial stage of production;
the gas production is accumulated in n years after the operation;
the gas production rate in the nth hundred days;
peak daily gas production;
average daily gas production at the nth year stage;
annual daily gas production rate;
casing pressure at the initial stage of production;
pressing on the nth hundred days;
peak value casing pressure;
average casing pressure in the nth year stage;
annual rate of reduction of casing pressure;
gas is produced by unit set pressure drop in the nth year;
wherein n is a positive integer.
S002, drawing a scatter diagram by using parameters of a dynamic index system, wherein the parameters comprise the following contents:
optionally selecting two parameters from the production dynamic parameters at a time;
drawing a scatter diagram with one parameter as an X axis and the other parameter as a Y axis;
and continuously repeating the steps until all the production dynamic parameters are drawn in the scatter diagram.
S003, selecting a scatter diagram with a distribution rule and dividing the scatter diagram into three areas, namely a type I well, a type II well and a type III well, and specifically comprising the following steps:
viewing all scatter diagrams;
selecting a scatter diagram with concentrated gas well distribution positions and rising trend as a scatter diagram of a distribution rule;
two horizontal lines parallel to an X axis and two vertical lines parallel to a Y axis are made in a scatter diagram of the distribution rule, six lines including the X axis and the Y axis are staggered with each other to form a nine-grid, each line is finely adjusted to enable the nine-grid to cover all gas wells, then a diagonal line is made by taking an original point as a starting point, and a grid area where the diagonal line passes is sequentially a type I well, a type II well and a type III well, wherein an area where the type III well is located is a grid where the original point is located.
S004, drawing the production dynamic parameters of the type I well, the type II well and the type III well into radar maps, specifically:
collecting a scatter diagram of the distribution rule;
classifying all gas wells in the scatter diagram with the distribution rule;
and respectively recording the production dynamic parameters of all the type I wells, all the type II wells and all the type III wells, and drawing a radar chart.
S005, obtaining the production dynamic parameters of the target gas well of the type to be judged and searching the type of the gas well in the radar map, wherein the method specifically comprises the following steps:
acquiring the daily gas production rate of a target gas well at the initial production period, the accumulated gas production rate of the target gas well in n years of production, the n hundred-day daily gas production rate, the average daily gas production rate at the nth year stage and the accumulated gas production rate of the unit set pressure drop in the nth year, wherein n is the maximum value;
searching the five parameters in the steps in the radar map, and searching the area in which each parameter falls;
and determining the area containing the most parameters as the type of the gas well of the target gas well.
Step S006, the specific steps are as follows:
s601, setting the weight of the daily gas production rate at the initial stage of the operation as P1, the weight of the accumulated gas production rate in n years of the operation as P2, the weight of the daily gas production rate in the nth hundred days as P3, the weight of the average daily gas production rate in the nth year stage as P4 and the weight of the accumulated gas production rate in the unit set pressure drop in the nth year as P5, wherein P1+ P2+ P3+ P4+ P5 is 100%;
s602, calculating the type of the target gas well by using the following formula:
X1×P1+X2×P2+X3×P3+X4×P4+X5×P5
wherein:
x1 is the gas well type to which the daily gas production at the initial stage of production belongs, which is determined by using a radar map;
x2 is the type of gas well to which the n-year cumulative gas production on stream is determined using a radar map;
x3 is the gas well type to which the gas production rate on the nth hundred days determined by the radar chart belongs;
x4 is the gas well type to which the average daily gas production in the nth year stage determined by the radar map belongs;
x5 is the gas well type to which the unit set pressure drop accumulated gas in the nth year belongs, which is determined by using a radar map;
the gas well type is a type I well, a type II well or a type III well;
and S603, merging the gas wells of the same type in the formula S602, comparing the numerical values of the gas wells of the same type, and determining the gas well type with the maximum numerical value as the target gas well type.
Because the daily gas production rate at the initial stage of production, the accumulated gas production rate at n years of production, the gas production rate at the nth hundred days of production, the daily gas production rate at the average stage of the nth year and the accumulated gas production rate at the unit pressure drop (n is the maximum value) at the nth year are main parameters for dividing the type of the gas well, but different parameters have different functions for determining the type of the gas well, each parameter has different specific gravity in the determination of the type, the assignment of the weight is not given randomly, but the weight of each parameter in the determination of the type is reversely solved according to a typical well, and the specific weight is as follows:
a typical gas well meeting a certain type is selected, such as Su 48-17-75, the well is evaluated as a type I well by reservoir parameter static evaluation, and the well is evaluated as the type I well by the unimpeded flow dynamic evaluation after reservoir transformation.
According to the partition criteria of Table 2, four of the five significant parameters are characteristic of a type I well, defining the well as a typical type I well.
For this typical type i well, n years of operation is three years of operation.
The specific gravity of daily gas production is a, the specific gravity of the accumulated gas production in three years of production is b, the specific gravity of the unit pressure drop accumulated gas production in the third year is c, the specific gravity of the daily gas production in the 900 th day is d, the specific gravity of the average daily gas production in the third year stage is e, and the specific gravity of the daily gas production in the initial stage of production is f.
Where a + b + c is 100%, d, e, and f form a subclass of a, i.e., a + d + e + f is 100%.
And (5) continuously adjusting the quantities a, b, c, d, e and f, and observing the influence of the change of the specific gravity of different parameters on the classification result.
Through continuous debugging, the gas production rate accumulated in the third year of the production, the gas production rate accumulated in the unit of pressure drop in the third year, the daily gas production rate in the initial stage of the production have large influence on the category, and the daily gas production rate in the 900 th day and the daily gas production rate in the average stage of the third year have small influence on the category.
The optimal effect is given when a is 40%, b is 30%, c is 30%, d is 70%, e is 15% and f is 15% in combination with the actual production of the gas well.
The weight of each parameter in the type determination is thus determined:
the gas production rate is 30% in three years;
the unit set pressure drop accumulated gas production accounts for 30% in the third year;
the daily gas production rate at the initial stage of production is 40 percent multiplied by 70 percent which is 28 percent;
the daily gas production ratio of 40 percent multiplied by 15 percent on the 900 th day is 6 percent;
the daily gas production rate of the average stage in the third year is 40% × 15% ═ 6%.
The following can be seen in particular:
TABLE 3 weight table of main indexes
Calculating the gas well type according to the weight table of table 3:
knowing the production parameters of the target gas well, the gas well type can be calculated as:
the type (the gas production accumulated in three years of operation) is multiplied by 30% + the type (the gas production accumulated in unit set pressure drop in the third year) is multiplied by 30% + the type (the gas production daily in the initial period of operation) is multiplied by 28% + the type (the gas production daily in the 900 th day) is multiplied by 6% + the type (the gas production daily in the average stage in the third year) is multiplied by 6%, and the type I well is the type I well if the type I well is high in occupation ratio, the type II well is the type II well if the type II well is high in occupation ratio, and the type III well is the type III well if the type III well is high in.
The type (the three-year-put-into-production accumulated gas production rate) refers to a type determined by the radar map for the three-year-into-production accumulated gas production rate of the target gas well, and if the three-year-into-production accumulated gas production rate is determined to be a type I well by the radar map, the radar map determination is repeated: the pressure drop accumulated gas production of a unit set in the third year is judged to be a type I well by using a radar map, the daily gas production at the initial stage of production is judged to be a type II well by using the radar map, the daily gas production at the 900 th day is judged to be a type II well by using the radar map, the daily gas production at the average stage of the third year is judged to be a type III well by using the radar map, then the type I well is multiplied by 30% + the type I well multiplied by 30% + the type II well multiplied by 28% + the type II well multiplied by 6% + the type III well multiplied by 6%, finally the type I well is 60%, the type II well is 34%, the type III well is 6%, obviously, the type I well accounts for a high ratio, and the target gas well is.
It can be seen that the radar chart is the primary judgment, and the weight is the secondary judgment, that is, the embodiment provides a continuous twice judgment mode, and the purpose is to improve the judgment accuracy and correctly evaluate the production capacity of the gas well in the middle and later periods, and is very important for selecting a proper drainage and gas production measure and economically and effectively developing the gas well.
Fourth embodiment:
the type identification of a certain single well is taken as an example for explanation:
threo 14-M-13 well:
and judging the category of each parameter according to the gas well type division standard.
The gas production rate of the well is 1292.58 multiplied by 10 in three years4m3A class II well;
the unit pressure drop accumulated gas production in the third year is 90.94 multiplied by 104m3a/MPa, class II well;
the daily gas production of 900 th day is 0.44 multiplied by 104m3(ii)/d, is a class III well;
the daily gas production rate in the average stage of the third year is 0.88 multiplied by 104m3And/d, is a type II well;
the daily gas production at the initial stage of production is 2.27 multiplied by 104m3And/d is a type II well.
According to the index weight table, the gas production rate is 30% in three years of operation, the gas production rate is 30% in unit pressure drop gas production rate in the third year, the gas production rate in 900 hundred days is 6%, the gas production rate in the average period of the third year is 6%, the gas production rate in the initial period of operation is 28%, and the types of Su 14-15-13 wells are determined as follows:
class ii × 30% + class iii × 6% + class ii × 28% + 94% class ii + 6% class iii.
The comprehensive available Su 14-15-13 well belongs to the II type well.
The five parameters are plotted in a radar chart, see fig. 16, and it can be seen that the area of the five parameter connections falls mostly in the area of the type ii well, and therefore the well is judged to be a type ii well.
It should be noted that the above well number data are all effective parameters of real wells, and the median of the well number is replaced by M in consideration of the secret related data.
In conclusion, the method comprehensively considers the influence of multiple production dynamic indexes of the gas well, can more scientifically evaluate the production capacity of the gas well in the middle and later periods of production, and provides a reliable basis for selecting proper drainage and gas production measures for the gas well; the formed gas well type division standard is based on 5 indexes which have the largest influence in the gas well production dynamics, and is simple, reliable and strong in operability; the weight proportion of 5 indexes in the gas well type identification is reversely solved by utilizing a typical well and combining with the gas well production practice, so that the method not only accords with the practice, but also is more scientific; the type of the gas well can be easily judged by utilizing a radar map formed by 5 judgment standards.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.
Claims (7)
1. The method for judging the type of the gas well based on the gas well production dynamic index system is characterized by comprising the following steps of:
s001, establishing a production dynamic index system;
s002, drawing a scatter diagram by using parameters of a production dynamic index system;
s003, selecting a scatter diagram with a distribution rule and dividing the scatter diagram into three areas, namely a type I well, a type II well and a type III well;
s004, drawing the production dynamic parameters of the type I well, the type II well and the type III well into radar maps;
and S005, acquiring the production dynamic parameters of the target gas well of the type to be judged and searching the type of the gas well in the radar map.
2. The method for determining the type of a gas well based on the gas well production dynamic index system as claimed in claim 1, wherein the step S001 of establishing the production dynamic index system specifically means acquiring the following production dynamic parameters:
the daily gas production rate at the initial stage of production;
the gas production is accumulated in n years after the operation;
the gas production rate in the nth hundred days;
peak daily gas production;
average daily gas production at the nth year stage;
annual daily gas production rate;
casing pressure at the initial stage of production;
pressing on the nth hundred days;
peak value casing pressure;
average casing pressure in the nth year stage;
annual rate of reduction of casing pressure;
gas is produced by unit set pressure drop in the nth year;
wherein n is a positive integer.
3. A method for determining the type of a gas well based on a dynamic indicator system for gas well production as set forth in claim 2 wherein the step S002 of plotting a scatter plot using the parameters of the dynamic indicator system for production comprises the following steps:
optionally selecting two parameters from the production dynamic parameters at a time;
drawing a scatter diagram with one parameter as an X axis and the other parameter as a Y axis;
and continuously repeating the steps until all the production dynamic parameters are drawn in the scatter diagram.
4. The method for determining the type of a gas well based on the gas well production dynamic index system as claimed in claim 3, wherein in step S003, a scatter plot of the distribution law is selected and divided into three regions, i.e., a type i well, a type ii well and a type iii well, and specifically the following are selected:
viewing all scatter diagrams;
selecting a scatter diagram with concentrated gas well distribution positions and rising trend as a scatter diagram of a distribution rule;
two horizontal lines parallel to an X axis and two vertical lines parallel to a Y axis are made in a scatter diagram of the distribution rule, six lines including the X axis and the Y axis are staggered with each other to form a nine-grid, each line is finely adjusted to enable the nine-grid to cover all gas wells, then a diagonal line is made by taking an original point as a starting point, and a grid area where the diagonal line passes is sequentially a type I well, a type II well and a type III well, wherein an area where the type III well is located is a grid where the original point is located.
5. The method for determining the type of a gas well based on the gas well production dynamic index system as claimed in claim 4, wherein the step S004 is performed by drawing the production dynamic parameters of the type I well, the type II well and the type III well as radar maps, specifically:
collecting a scatter diagram of the distribution rule;
classifying all gas wells in the scatter diagram with the distribution rule;
and respectively recording the boundary parameters of the production dynamic parameters of all the type I wells, all the type II wells and all the type III wells, compiling a gas field type division standard table, and drawing a radar map according to the table.
6. The method for determining the type of the gas well based on the gas well production dynamic index system as claimed in claim 5, wherein the step S005 is to obtain the production dynamic parameters of the target gas well of the type to be determined and search the type of the gas well in the radar map, and specifically comprises the following steps:
acquiring the daily gas production rate of a target gas well at the initial production period, the accumulated gas production rate of the target gas well in n years of production, the n hundred-day daily gas production rate, the average daily gas production rate at the nth year stage and the accumulated gas production rate of the unit set pressure drop in the nth year, wherein n is the maximum value;
searching the five parameters in the steps in the radar map, and searching the area in which each parameter falls;
and determining the area containing the most parameters as the type of the gas well of the target gas well.
7. The method for determining the type of a gas well based on the gas well production dynamic index system as set forth in claim 6, further comprising the step S006, which comprises the following specific steps:
s601, setting the weight of the daily gas production rate at the initial stage of the operation as P1, the weight of the accumulated gas production rate in n years of the operation as P2, the weight of the daily gas production rate in the nth hundred days as P3, the weight of the average daily gas production rate in the nth year stage as P4 and the weight of the accumulated gas production rate in the unit set pressure drop in the nth year as P5, wherein P1+ P2+ P3+ P4+ P5 is 100%;
s602, calculating the type of the target gas well by using the following formula:
X1×P1+X2×P2+X3×P3+X4×P4+X5×P5
wherein:
x1 is the gas well type to which the daily gas production at the initial stage of production belongs, which is determined by using a radar map;
x2 is the type of gas well to which the n-year cumulative gas production on stream is determined using a radar map;
x3 is the gas well type to which the gas production rate on the nth hundred days determined by the radar chart belongs;
x4 is the gas well type to which the average daily gas production in the nth year stage determined by the radar map belongs;
x5 is the gas well type to which the unit set pressure drop accumulated gas in the nth year belongs, which is determined by using a radar map;
the gas well type is a type I well, a type II well or a type III well;
and S603, merging the gas wells of the same type in the formula S602, comparing the numerical values of the gas wells of the same type, and determining the gas well type with the maximum numerical value as the target gas well type.
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