CN112901145B - Volume energy method for analyzing injection-production relation between oil-water wells - Google Patents

Volume energy method for analyzing injection-production relation between oil-water wells Download PDF

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CN112901145B
CN112901145B CN202110305671.9A CN202110305671A CN112901145B CN 112901145 B CN112901145 B CN 112901145B CN 202110305671 A CN202110305671 A CN 202110305671A CN 112901145 B CN112901145 B CN 112901145B
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陈玲玲
盖德林
刘向斌
李国�
汪旭颖
尚宏志
王力
戎昊
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Daqing Oilfield Co Ltd
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00—Survey of boreholes or wells
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Abstract

The invention relates to the technical field of oil extraction engineering, in particular to a volume energy method for analyzing injection-production relation between oil wells and water wells. The method solves the problem that the conventional analysis between the injection quantity and the produced liquid quantity does not consider the action of pressure parameters when the correlation response of the water well and the oil well is analyzed, and the injection-production relation between the oil well and the water well cannot be faithfully reflected. The invention firstly defines the volume energy as the product of pressure and liquid quantity, and then analyzes the relationship between the oil well volume energy and the water well volume energy by applying a statistical correlation coefficient method to reflect the fluid circulation degree between an oil well and a water well. Compared with a single liquid quantity method, the method provided by the invention more objectively reflects the response relation between the oil well and the water well, is simple and convenient in practical application, and provides technical support for searching an excellent flow field and an inefficient ineffective circulation area.

Description

Volume energy method for analyzing injection-production relation between oil-water wells
The technical field is as follows: the invention relates to the technical field of oil extraction engineering, in particular to a volume energy method for analyzing injection-production relation between oil wells and water wells.
Background art: as each large oil field enters the middle and later development stages, the comprehensive water content is high. The method is an important way to find an ineffective circulation area for treating the water flooding, reduce the comprehensive water content of the oil field and improve the development benefit. The application of volume energy provides a new method for the inefficient ineffective circulation area, the pressure parameter function is considered, and the liquid flow relationship between oil and water wells can be objectively reflected compared with the common volume method.
The invention content is as follows: the invention aims to utilize data such as injection pressure, injection liquid amount, extraction pressure, extraction liquid amount and the like in a well history to calculate the correlation coefficient of a well and a surrounding oil well by using a volume energy method, ensure the real evaluation and evaluation of the correlation degree of the well and the surrounding oil well, and provide a volume energy method for analyzing the injection-extraction relation between oil and water wells for matched production increasing measures.
The technical scheme of the invention is as follows: a method for analyzing the volume energy of injection-production relation between oil and water wells comprises the following steps:
the first step is as follows: defining a volumetric energy;
the second step is that: calculating a volume energy set of the oil-water well within a certain time period;
the third step: and (3) calculating the value of the correlation coefficient of the water well and the peripheral oil well by using a statistical correlation coefficient method, wherein the value range is between-1 and 1, and the larger the value is, the larger the correlation is, the stronger the flow field between the injection and production wells is, and the more easily formed is an ineffective circulation area.
The volume energy in the first step is defined as the product of volume and pressure, and the volume of the injection well can be the product of injection liquid quantity and injection pressure; the volume energy of the production well is the product of the production liquid quantity and the flow pressure.
The calculation method of the volume energy set of the oil-water well in a certain time period in the second step comprises the following steps:
well volume energy sequence Y ═ Yk} Yk＝Pk*Qk
Wherein Y is the volume energy set of the water well;
Yk(ii) the volume energy at month k;
Qkinjecting liquid for the month of the kth month, and obtaining the liquid from the well history;
Pk(ii) injection pressure for the k month, obtained from well history;
oil well volume energy sequence Xi＝{Xik} Xik＝Pik*Qik
Wherein, XiThe volume energy set of the oil well i;
Xikthe volume energy of the oil well i at the kth month;
Qikacquiring the monthly fluid production of the oil well i in the kth month from the well history;
Pikthe bottom hole flow force for the k month of well i was obtained from the well history.
The calculation method of the correlation coefficient values of the water well and the peripheral oil well in the third step comprises the following steps:
Figure BDA0002983970790000021
wherein Y is the volume energy set of the water well;
Xithe volume energy set of the oil well i;
Xikthe volume energy of the oil well i at the kth month;
Figure BDA0002983970790000022
the average value of the volume energy of the oil well i in each month;
Yk(ii) the volume energy at month k;
Figure BDA0002983970790000031
the average value of the volume energy of the water well in each month is shown.
The invention has the following advantages:
1) the data used in the invention is data in well history, the data item source is simple, and the practical application is simple and convenient;
2) the invention realizes the real evaluation of the injection-production relationship of the water well and the surrounding oil wells, and can objectively reflect the relevance between oil wells and water wells by considering the action of pressure;
3) the invention provides a new concept and evaluation method of volume energy.
Description of the drawings: FIG. 1 is a schematic diagram of a production-injection well group.
The specific implementation mode is as follows: the invention will be further illustrated with reference to specific examples: selecting the well history part data of a certain injection and four-extraction well group of the oil field, wherein the data is shown in a table 1:
TABLE 1 production data for a well of a given injection and production well group
Figure BDA0002983970790000032
Figure BDA0002983970790000041
The first step is as follows: defining volumetric energy
Volume can be defined as the product of volume and pressure, and injection well volume can be the product of injection fluid volume and injection pressure; the volume of the production well can be the product of the production liquid quantity and the flow pressure.
The second step is that: calculating the volume energy set of the oil-water well in a certain time period
The calculation formula of the water well volume energy sequence is as follows:
Y＝{Yk} Yk＝Pk*Qk，
as can be seen from Table 2, the volume sequence of the wells is 12 values in Table 2, and the average value of the volume energy of the wells
Figure BDA0002983970790000042
Is 21989m3·MPa。
TABLE 1 values of known parameters of wells
k Amount of monthly fluid injection Qk(m3) Injection pressure Pk(MPa)
1 1135 12.3
2 1036 12.5
3 1159 12.5
4 1917 12.6
5 2002 12.55
6 1935 12.8
7 1998 13
8 1849 13.2
9 1918 12.7
10 1784 12.8
11 1895 13
12 2001 13.1
TABLE 2 calculated values of well volume
Figure BDA0002983970790000051
The volume energy sequence calculation formula of the oil well 1 is
X1＝{X1k}，X1k＝P1k*Q1k
As can be seen from Table 4, the volumetric energy series of well 1 is 12 volumetric energy values corresponding to k from 1 to 12 in Table 4, and the average value of the volumetric energy of well 1 is
Figure BDA0002983970790000061
TABLE 3 known values of parameters for oil well 1
k Monthly fluid output Q1k(m3) Flow pressure P1k(MPa)
1 1008 2.1
2 800 1.94
3 972 2.1
4 865 1.95
5 966 1.89
6 1212 1.87
7 1209 2.06
8 1179 1.91
9 842 1.98
10 758 1.97
11 763 1.92
12 895 1.79
TABLE 4 calculated values of the volume of well 1
Figure BDA0002983970790000062
The volume energy sequence calculation formula of the oil well 2 is
X2＝{X2k}，X2k＝P2k*Q2k
As can be seen from Table 6, the volumetric energy series of the well 2 is 12 volumetric energy values corresponding to k from 1 to 12 in Table 6
TABLE 5 known values of parameters for well 2
k Monthly fluid output Q2k(m3) Flow pressure P2k(MPa)
1 1665 6.96
2 1488 7.72
3 1858 8.19
4 1854 8.07
5 1716 6.88
6 1774 6.98
7 1745 7.08
8 1959 7.12
9 1667 7.14
10 1535 6.96
11 1497 6.95
12 1712 7.05
TABLE 6 calculated values of the volume of well 2
Figure BDA0002983970790000071
The volume energy sequence calculation formula of the oil well 3 is
X3＝{X3k}，X3k＝P3k*Q3k
As can be seen from table 8, the volumetric energy series for well 1 is 12 volumetric energy values corresponding to k from 1 to 12 in table 8.
TABLE 7 known values of parameters for the well 3
k Monthly fluid output Q3k(m3) Flow pressure P3k(MPa)
1 338 2.11
2 314 1.79
3 423 1.87
4 356 1.99
5 535 5.3
6 827 5.38
7 912 1.89
8 873 2.03
9 783 2.32
10 810 6.83
11 856 1.76
12 835 2.14
TABLE 8 calculated values of the volume of well 3
Figure BDA0002983970790000081
The volume energy sequence calculation formula of the oil well 4 is
X4＝{X4k}，X4k＝P4k*Q4k
As can be seen from table 8, the volumetric energy series for well 1 is 12 volumetric energy values corresponding to k from 1 to 12 in table 10.
TABLE 9 known values of parameters for well 4
k Monthly fluid output Q4k(m3) Flow pressure P4k(MPa)
1 1302 2.41
2 1126 1.87
3 1344 1.76
4 1308 1.89
5 1203 1.97
6 1281 1.79
7 1280 1.85
8 1362 2.11
9 1210 2.1
10 1267 1.78
11 1140 2.07
12 1130 2.02
TABLE 10 calculated values of the volume of well 4
Figure BDA0002983970790000091
The third step: and (3) calculating the value of the correlation coefficient of the water well and the peripheral oil well by using a statistical correlation coefficient method, wherein the value range is between-1 and 1, and the larger the value is, the higher the correlation is, and the stronger the oil-water well circulation is.
Figure BDA0002983970790000101
1) Calculating the correlation coefficient of the oil well 1 and the water well
Figure BDA0002983970790000102
Substituting the data in Table 2 and Table 4 into the formula to calculate
γ(Y，X1)＝0.03
The correlation coefficient for well 1 and water well is 0.03.
2) Calculating the correlation coefficient of the oil well 2 and the water well
Figure BDA0002983970790000103
Substituting the data in Table 2 and Table 6 into the formula to calculate
γ(Y，X2)＝-0.1
The correlation coefficient for the oil well 2 and the water well is-0.1.
3) Calculating the correlation coefficient of the oil well 3 and the water well
Figure BDA0002983970790000111
Substituting the data in Table 2 and Table 8 into the formula to calculate
γ(Y，X3)＝0.44
The correlation coefficient for oil well 2 and water well is 0.44.
4) Calculating the correlation coefficient of the oil well 4 and the water well
Figure BDA0002983970790000112
Substituting the data in Table 2 and Table 10 into the formula to calculate
γ(Y，X4)＝-0.17
The correlation coefficient for the oil well 4 and the water well is-0.17.
According to the calculation method, the following steps are known: the calculated value of the correlation coefficient gamma between the oil and the water is in the range of-1 to 1, and the higher the gamma value is, the better the correlation between the oil and the water is. The correlation coefficient between the oil well 2 and the water well in the example is 0.44, which is larger than that between the oil well 1, the oil well 3, the oil well 4 and the water well, and the correlation degree between the two is the largest.
The above examples demonstrate that: the invention firstly defines the volume as the product of pressure and liquid volume, then analyzes the correlation coefficient between the oil well volume and the water well volume by applying a statistical correlation coefficient method, can truly reflect the liquid volume circulation relationship between the oil well and the water well, has simple and convenient practical application and provides a basis for the subsequent ineffective cyclic flooding treatment with low efficiency.

Claims (1)

1. A volume energy method for analyzing injection-production relation between oil-water wells is characterized in that: the method comprises the following steps:
the first step is as follows: defining a volumetric energy;
the second step is that: calculating a volume energy set of the oil-water well within a certain time period;
the third step: calculating the value of the correlation coefficient of the water well and the peripheral oil well by using a statistical correlation coefficient method, wherein the value range is between-1 and 1, and the larger the value is, the larger the correlation is, the stronger the flow field between the injection and production wells is, and the more easily an inefficient ineffective circulation area is formed;
the volume energy in the first step is defined as the product of volume and pressure, and the volume of the injection well can be the product of injection liquid quantity and injection pressure; the volume energy of the production well is the product of the production liquid quantity and the flow pressure;
the calculation method of the volume energy set of the oil-water well in a certain time period in the second step comprises the following steps:
water well volume energy sequence Y = { Yk } Yk =Pk*Qk
Wherein Y is the volume energy set of the water well;
Yk(ii) the volume energy at month k;
Qkinjecting liquid for the month of the kth month, and obtaining the liquid from the well history;
Pk(ii) injection pressure for the k month, obtained from well history;
oil well volume energy sequence Xi={Xik } Xik =Pik*Qik
Wherein, XiThe volume energy set of the oil well i;
Xikthe volume energy of the oil well i at the kth month;
Qikacquiring the monthly fluid production of the oil well i in the kth month from the well history;
Pikobtaining the bottom hole flow force of the oil well in the kth month from the well history;
the calculation method of the correlation coefficient values of the water well and the peripheral oil well in the third step comprises the following steps:
Figure DEST_PATH_IMAGE002
wherein Y is the volume energy set of the water well;
Xi the volume energy set of the oil well i;
Xikthe volume energy of the oil well i at the kth month;
Figure DEST_PATH_IMAGE004
the average value of the volume energy of the oil well i in each month;
Yk(ii) the volume energy at month k;
Figure DEST_PATH_IMAGE006
for water well of the volumetric energy of each monthAverage value.
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