CN113537655B - Method and device for judging restarting potential of gas well - Google Patents
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Abstract
The application discloses a method and a device for judging restarting potential of a gas well, and belongs to the technical field of petroleum industry gas reservoir engineering. According to the method for judging the restarting potential of the gas well, which is provided by the embodiment of the application, a plurality of evaluation indexes for judging the restarting potential of the target gas well are obtained, and a first index score of the evaluation indexes is determined by adopting a preset evaluation method; for each evaluation index, comparing the importance of the evaluation index with any other evaluation index in a plurality of evaluation indexes to obtain the weight corresponding to the evaluation index; determining a restarting index of the target gas well according to the first index score of the evaluation index and the corresponding weight of the first index score; and determining the restarting potential of the target gas well according to the magnitude relation between the restarting index and the first preset threshold value and the second preset threshold value. The method establishes a complete theoretical system, thereby determining the restarting potential of the target gas well according to the theoretical system, not only improving the accuracy of discrimination, but also expanding the application range.
Description
Technical Field
The application relates to the technical field of petroleum industry gas reservoir engineering. In particular to a method and a device for judging the restarting potential of a gas well.
Background
Because of the reasons of low productivity, low formation pressure, flooding, high difficulty in treating produced water, poor economic benefit and the like, some gas wells are shut down in the development process. However, as the development years of gas wells are prolonged, the number of gas wells to be shut down is increased, and the economic benefit of gas well development is greatly affected. Under the condition, the method can consider restarting the shut-down gas well, the yield of the shut-down gas well can be improved to a certain extent, the economic benefit of gas well development is enhanced, and the restarting potential of judging the shut-down gas well becomes an important reference index for restarting the shut-down gas well.
In the related technology, related personnel mainly judge the restarting potential of the shut-down gas well according to the working experience of the related personnel, and when the related personnel consider that the shut-down gas well has the restarting potential, the gas well is restarted; when the associated personnel consider that the shut-in gas well does not have the potential to restart, then the gas well is not activated.
However, in the related art, when judging the restarting potential of the shut-down gas well, only the subjective experience of related personnel is relied on, the theoretical basis is lacking, and the judging accuracy is poor.
Disclosure of Invention
The embodiment of the application provides a method and a device for judging the restarting potential of a gas well, which can determine the restarting potential of a shut-down gas well through a complete theoretical system and can improve the judging accuracy. The specific technical scheme is as follows:
in one aspect, an embodiment of the present application provides a method for determining restart potential of a gas well, where the method includes:
acquiring a plurality of evaluation indexes for judging restarting potential of a target gas well, wherein the target gas well is a shut-down gas well;
determining a first index score of each evaluation index by adopting a preset evaluation method;
for each evaluation index, comparing the importance of the evaluation index with any other evaluation index in the plurality of evaluation indexes to obtain a weight corresponding to the evaluation index;
determining a restarting index of the target gas well according to the first index score of the evaluation index and the corresponding weight of the first index score;
determining the restarting potential of the target gas well according to the magnitude relation between the restarting index and the first preset threshold value and the second preset threshold value;
when the evaluation index is the remaining dynamic reserve, determining a first index score of each evaluation index by adopting a preset evaluation method comprises the following steps:
acquiring a remaining value of a remaining dynamic reserve of the last year in which the target gas well was shut down;
obtaining a threshold value of remaining dynamic reserves which the target gas well should have when restarted;
determining whether the ratio of the remaining value to the limit value is less than a third preset threshold;
when the ratio is smaller than the third preset threshold value, taking the ratio of the residual value to the limit value as a first index score of the evaluation index;
and when the ratio is not smaller than the third preset threshold value, taking the third preset threshold value as a first index score of the evaluation index.
In another possible implementation manner, when the evaluation index is the contribution of the target gas well to the gas reservoir, the determining, by using a preset evaluation method, a first index score of the evaluation index includes:
when the contribution value of the target gas well to the gas reservoir contribution is larger than a preset contribution value, giving a first index score of the evaluation index of 1;
when the difference value between the contribution value of the target gas well to the gas reservoir contribution and the preset contribution value is within the preset range, giving a first index score of the evaluation index of 0.5;
and when the difference value between the contribution value of the target gas well to the gas reservoir contribution and the preset contribution value is smaller than the preset range and the contribution value is smaller than the preset contribution value, giving a first index score of the evaluation index of 0.
In another possible implementation manner, the evaluation index further includes: annual water production, annual gas production, and costs associated with taking technical measures for the target gas well.
In another possible implementation manner, the determining the restart index of the target gas well according to the first index score of the evaluation index and the corresponding weight thereof includes:
for each evaluation index, determining the product of a first index score of the evaluation index and a corresponding weight of the first index score to obtain a second index score of the evaluation index;
and summing the second index scores of the plurality of evaluation indexes to obtain the restarting index.
In another possible implementation manner, the determining the restart potential of the target gas well according to the magnitude relation between the restart index and the first preset threshold and the second preset threshold includes:
when the restarting index is larger than a first preset threshold value, determining that the target gas well has restarting potential;
when the restart index is greater than a second preset threshold value but not greater than the first preset threshold value, determining an alternative object for restarting the target gas well;
and when the restarting index is not greater than the second preset threshold value, determining that the target gas well does not have restarting potential.
In another aspect, an embodiment of the present application provides a device for determining restart potential of a gas well, where the device includes:
the acquisition module is used for acquiring a plurality of evaluation indexes for judging restarting potential of a target gas well, wherein the target gas well is a shut-down gas well;
the first determining module is used for determining a first index score of each evaluation index by adopting a preset evaluation method;
the comparison module is used for comparing the importance of each evaluation index with any other evaluation index in the plurality of evaluation indexes to obtain the weight corresponding to the evaluation index;
the second determining module is used for determining the restarting index of the target gas well according to the first index score of the evaluation index and the corresponding weight of the first index score;
the third determining module is used for determining the restarting potential of the target gas well according to the magnitude relation between the restarting index and the first preset threshold value and the second preset threshold value;
when the evaluation index is the residual dynamic reserve, the first determining module is further used for obtaining a residual value of the residual dynamic reserve of the last year that the target gas well was shut down; obtaining a threshold value of remaining dynamic reserves which the target gas well should have when restarted; determining whether the ratio of the remaining value to the limit value is less than a third preset threshold; when the ratio is smaller than the third preset threshold value, taking the ratio of the residual value to the limit value as a first index score of the evaluation index; and when the ratio is not smaller than the third preset threshold value, taking the third preset threshold value as a first index score of the evaluation index.
In another possible implementation manner, when the evaluation index is that the target gas well contributes to the gas reservoir, the first determining module is further configured to assign a first index score of 1 to the evaluation index when the contribution value of the target gas well to the gas reservoir contribution is greater than a preset contribution value; when the difference value between the contribution value of the target gas well to the gas reservoir contribution and the preset contribution value is within the preset range, giving a first index score of the evaluation index of 0.5; and when the difference value between the contribution value of the target gas well to the gas reservoir contribution and the preset contribution value is smaller than the preset range and the contribution value is smaller than the preset contribution value, giving a first index score of the evaluation index of 0.
In another possible implementation manner, the evaluation index further includes: annual water production, annual gas production, and costs associated with taking technical measures for the target gas well.
In another possible implementation manner, the second determining module is further configured to determine, for each evaluation index, a product of a first index score of the evaluation index and a weight corresponding to the first index score, to obtain a second index score of the evaluation index; and summing the second index scores of the plurality of evaluation indexes to obtain the restarting index.
In another possible implementation manner, the third determining module is further configured to determine that the target gas well has a restart potential when the restart index is greater than a first preset threshold; when the restart index is greater than a second preset threshold value but not greater than the first preset threshold value, determining an alternative object for restarting the target gas well; and when the restarting index is not greater than the second preset threshold value, determining that the target gas well does not have restarting potential.
The beneficial effects that technical scheme that this application embodiment provided brought are:
according to the method for judging the restarting potential of the gas well, which is provided by the embodiment of the application, a plurality of evaluation indexes for judging the restarting potential of the target gas well are obtained, and a first index score of the evaluation indexes is determined by adopting a preset evaluation method; for each evaluation index, comparing the importance of the evaluation index with any other evaluation index in a plurality of evaluation indexes to obtain the weight corresponding to the evaluation index; determining a restarting index of the target gas well according to the first index score of the evaluation index and the corresponding weight of the first index score; and determining the restarting potential of the target gas well according to the magnitude relation between the restarting index and the first preset threshold value and the second preset threshold value. When the evaluation index is the remaining dynamic reserve, a first index score corresponding to the remaining dynamic reserve and the remaining dynamic reserve value of the last year when the target gas well was shut down and the limit value of the remaining dynamic reserve to be provided when the target gas well is restarted are determined. The method establishes a complete theoretical system, thereby determining the restarting potential of the target gas well according to the theoretical system, and compared with the method which only relies on subjective experience of related personnel, the method not only improves the accuracy of discrimination, but also expands the application range of the method.
Drawings
FIG. 1 is a flow chart of a method for discriminating the restart potential of a gas well provided in an embodiment of the present application;
FIG. 2 is a schematic diagram of determining weights of evaluation indexes by a hierarchical analysis method according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a device for discriminating restarting potential of a gas well according to an embodiment of the present application.
Detailed Description
In order to make the technical solution and advantages of the present application more clear, the following embodiments of the present application are described in further detail.
The embodiment of the application provides a method for judging the restarting potential of a gas well, referring to fig. 1, the method comprises the following steps:
step 101: and acquiring a plurality of evaluation indexes for judging the restarting potential of the target gas well.
In embodiments of the present application, the target gas well is a shut-in gas well. The plurality of evaluation indexes include: the remaining dynamic reserves, annual gas production, annual water production, contribution of the target gas well to the gas reservoir, and costs associated with taking technical measures for the target gas well.
The annual water yield and the cost consumed by taking technical measures on the target gas well belong to the restart cost class evaluation object, the annual gas yield belongs to the restart income class evaluation object, the residual dynamic reserve belongs to the restart potential class evaluation object, and the contribution of the target gas well to the gas reservoir belongs to the influence class evaluation object to the gas reservoir.
In one possible implementation, the evaluation index may be increased according to the actual situation of the target gas well, for example, the increased evaluation index may be: influence on oil pressure. When restarting the target gas well, if the oil pressure of the wellhead is smaller than the pressure of the delivery, the target gas well may not produce gas, and the restarting is unsuccessful. In the embodiment of the present application, the increased evaluation index is not particularly limited.
It should be noted that, in the related art, the subjective experience of the related personnel is mainly relied on to determine the restarting potential of the target gas well. When the related personnel consider that the target gas well has restarting potential, restarting the target gas well; when the associated personnel consider that the target gas well does not have restart potential, the target gas well is not activated. The method in the related art lacks theoretical basis and cannot be popularized and applied. Moreover, when a person is involved in determining whether a target gas well has a restarting potential, the person is generally determined according to a single evaluation index, and the influence of other evaluation indexes is not considered, so that the accuracy of the determination is poor.
Step 102: and determining a first index score of each evaluation index by adopting a preset evaluation method.
In this step, different evaluation methods are used to determine the first index scores of the different evaluation indexes.
In one possible implementation, when the evaluation index is the remaining dynamic reserve, this step may be implemented by the following steps (1) to (3), including:
(1) The remaining value of the remaining dynamic reserve of the last year that the target gas well was shut-in is obtained.
The remaining dynamic reserve is the difference between the dynamic reserve of the target gas well and the produced reserve after the target gas well is shut down.
(2) A threshold value of the remaining dynamic reserve that the target gas well should have when restarted is obtained.
The threshold value of the remaining dynamic reserve that the target gas well should have when restarted is the minimum value of the remaining dynamic reserve that the target gas well should have when restarted.
(3) And determining a first index score of the evaluation index according to the ratio of the residual value to the limit value.
In the step, determining whether the ratio of the residual value to the limit value is smaller than a third preset threshold value; when the ratio is smaller than a third preset threshold value, taking the ratio of the residual value to the limit value as a first index score of the evaluation index; and when the ratio is not smaller than a third preset threshold value, taking the third preset threshold value as a first index score of the evaluation index.
The third preset threshold may be set and changed as required, which is not specifically limited in the embodiment of the present application. For example, the third preset threshold is 1.
In another possible implementation, when the evaluation index is annual gas production, this step may be: acquiring annual gas production of the last year in which the target gas well is shut down; acquiring a limit value of annual gas production which the target gas well should have when restarted; and determining a first index score of the evaluation index according to the ratio of the annual gas production of the last year to the limit value.
The limit value of the annual gas production which the target gas well should have when restarted is the minimum value of the annual gas production which the target gas well should have when restarted. In this implementation manner, the step of determining the first index score of the evaluation index according to the ratio of the gas production amount of the previous year to the threshold value is: determining whether the ratio of the limit value of the gas production of the previous year is smaller than a third preset threshold value; when the ratio is smaller than a third preset threshold value, taking the ratio as a first index score of the evaluation index; and when the ratio is not smaller than a third preset threshold value, taking the third preset threshold value as a first index score of the evaluation index.
The step is similar to the step of determining the first index score of the evaluation index according to the ratio of the remaining value to the threshold value when the evaluation index is the remaining dynamic reserve, and will not be described herein.
In another possible implementation, when the evaluation index is annual water production, this step may be: acquiring annual water yield of the last year in which the target gas well is shut down; acquiring a limit value of annual water yield which the target gas well should have when being restarted; and determining a first index score of the evaluation index according to the ratio of the annual water yield of the last year to the limit value.
The limit value of the annual water yield to be provided when the target gas well is restarted is the maximum value of the annual water yield to be provided when the target gas well is restarted. In this implementation manner, the step of determining the first index score of the evaluation index according to the ratio of the annual water yield to the threshold value in the last year is: determining whether the ratio of the annual water yield to the limit value in the last year is smaller than a third preset threshold value; when the ratio is smaller than a third preset threshold value, taking the difference value between the third preset threshold value and the ratio as a first index score of the evaluation index; and when the ratio is not smaller than a third preset threshold value, taking the third preset threshold value as a first index score of the evaluation index.
The more the water yield of the target gas well is, the more difficult the exploitation is, and the less the gas yield is.
In another possible implementation manner, when the evaluation index is that the target gas well contributes to the gas reservoir, the step may be implemented by the following steps (1) to (3), including:
(1) When the contribution value of the target gas well to the gas reservoir contribution is larger than the preset contribution value, the first index score of the evaluation index is 1.
The contribution value of the target gas well to the contribution of the gas reservoir refers to the contribution of the target gas well to other gas wells of the gas reservoir, namely the gas yield or economic benefit of the other gas wells of the gas reservoir can be increased when the target gas well is restarted.
In this step, when restarting the target gas well is helpful to increase the gas production of other gas wells and the increased gas production is greater than the preset contribution value, the first index score given to the evaluation index is 1.
The preset contribution value may be set and changed as required, and in the embodiment of the present application, this is not particularly limited.
(2) When the difference value between the contribution value of the target gas well to the gas reservoir contribution and the preset contribution value is within the preset range, the first index score of the evaluation index is 0.5.
When restarting the target gas well helps to increase the gas production of other gas wells, but the increased gas production is less, the first indicator assigned to the evaluation indicator is a score of 0.5.
(3) When the difference between the contribution value of the target gas well to the gas reservoir contribution and the preset contribution value is smaller than the preset range and the contribution value is smaller than the preset contribution value, the first index score of the evaluation index is 0.
When the gas production of other gas wells is not increased by restarting the target gas well or the cost is increased by restarting the target gas well, the first index score given to the evaluation index is 0.
In another possible implementation, when the evaluation index is the cost of taking a technological measure for the target gas well, this step may be: when the cost of taking technical measures on the target gas well is less than the first preset cost, the first index score of the evaluation index is given as 1; when the cost of taking technical measures on the target gas well is greater than the first preset cost and less than the second preset cost, the first index score given to the evaluation index is 0.4. When the cost of taking technical measures on the target gas well is greater than the second preset cost, the first index score of the evaluation index is 0.
In one possible implementation, the well is a self-injection well, and the first index is given a score of 1 without taking process measures and with little cost. For example, when a foam-removing and maintenance process is adopted for the well, the cost is greater than the first preset cost and less than the second preset cost, and the first index is given a score of 0.4. For another example, when gas lift, pumps and other measures are taken for the well, if the cost is greater than the second preset cost, the first index score is given to the well as 0.
The first preset cost and the second preset cost can be set and changed according to needs, and in the embodiment of the present application, this is not particularly limited.
The method has the advantages that the annual water yield in the evaluation index and the cost consumed by taking technical measures on the target gas well are reverse indexes, the larger the value is, the lower the corresponding index score is, the smaller the restart index obtained later is, and the restart of the target gas well is not facilitated; the smaller the value, the higher the corresponding index score, and the larger the restart index obtained later, the more favorable for restarting the target gas well. And for different evaluation indexes, the different preset evaluation methods are used for quantifying the different evaluation indexes, so that the restarting index is convenient to calculate.
Referring to table 1, table 1 includes first index scores of respective evaluation indexes calculated using different evaluation methods.
TABLE 1
Wherein G in Table 1 i G is the remaining value of the remaining dynamic reserves of the last year the target gas well was shut down jx A threshold value for the remaining dynamic reserves that the target gas well should have when restarted; w (W) i Annual water production for last year the target gas well was shut down, W jx A threshold value for the annual water production that the target gas well should have when restarted; qg i Qg for annual gas production last year when the target gas well was shut down x Is a threshold value for the annual gas production that the target gas well should have when restarted.
Step 103: for each evaluation index, the evaluation index is compared with any other evaluation index in a plurality of evaluation indexes in importance, and the weight corresponding to the evaluation index is obtained.
In one possible implementation manner, an evaluation index may be arbitrarily selected from a plurality of evaluation indexes, the evaluation index is compared with any other evaluation index in importance, and the weight of the evaluation index is determined according to the importance of the evaluation index relative to any other evaluation index. Correspondingly, according to the same method, the weight of any other evaluation index is sequentially determined.
In another possible implementation, the importance of each evaluation index with respect to the restart index may also be determined, and the weight of each evaluation index is determined according to the importance.
In another possible implementation, the weights of the evaluation indexes can also be determined by a hierarchical analysis method. The steps may be: establishing a hierarchical structure model, and dividing a decision target, a consideration factor (decision criterion) and a decision object into a highest layer, a middle layer and a lowest layer according to the interrelation between the decision target, the consideration factor (decision criterion) and the decision object to obtain a hierarchical structure diagram; constructing a judgment matrix, wherein the judgment matrix is used for representing the comparison of the relative importance of all factors of the layer relative to a certain factor of the upper layer; and then carrying out hierarchical single sequencing and consistency check thereof, and finally carrying out hierarchical total sequencing and consistency check thereof.
When the hierarchical structure model is built, the decision target is a restarting index, the consideration factors are all evaluation indexes, and the decision target is the restarting potential of the target gas well. In the implementation manner, the weight of each evaluation index can be obtained by calculating the feature vector of the judgment matrix.
In one possible implementation manner, when the hierarchical single ordering and consistency check are performed, calculating the maximum eigenvalue of the judgment matrix, and calculating a consistency index CI according to the maximum eigenvalue and the order of the judgment matrix; acquiring a random consistency index RI according to the order of the judgment matrix; the ratio of the consistency index to the random consistency index is taken as a consistency ratio CR, and when the consistency ratio CR is smaller than 0.1, the judgment matrix is determined to pass the consistency test.
In one possible implementation, the consistency index may be expressed by equation one;
equation one:
wherein lambda is max For the maximum eigenvalue of the judgment matrix, n is the order of the judgment matrix.
In one possible implementation, the relationship between the order of the judgment matrix and the random uniformity index can be seen in table 2.
TABLE 2
| n | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 |
| RI | 0 | 0 | 0.58 | 0.90 | 1.12 | 1.24 | 1.32 | 1.41 | 1.45 | 1.49 | 1.51 |
In one possible implementation, the consistency ratio may be expressed by equation two;
formula II:
when CR is less than 0.1, it is indicated that the degree of inconsistency of the judgment matrix is within the allowable range, and the judgment matrix passes the consistency test.
In one possible implementation, when the hierarchical total ordering and consistency check thereof are performed, the weight vector of the lowest layer to the uppermost layer total ordering is calculated, and the total ordering consistency ratio is used for detection. If the total sorting consistency ratio is less than 0.1, the decision can be made according to the result represented by the total sorting weight vector through consistency test.
Referring to fig. 2, fig. 2 is a schematic diagram of determining weights of the evaluation indexes by an analytic hierarchy process, and specific numerical values thereof may be referred to in table 1, where the weight values of the evaluation indexes in table 1 are example values. In fig. 2, the weight of each evaluation target is determined first, and the weights of the evaluation targets included in the evaluation targets are determined for the evaluation targets including a plurality of evaluation targets. For an evaluation object that includes only one evaluation index, the weight of the evaluation object is the weight of the evaluation index. In addition, the first class, the second class, the third class, the fourth class and the fifth class are the classes originally set for the restarting potential of the target gas well, and correspond to the large restarting potential, the general restarting potential, the small restarting potential and the no restarting potential respectively. The first type well and the second type well can be classified as the first type well, the third type well and the fourth type well are classified as the second type well, and the fifth type well is classified as the third type well.
In one possible implementation manner, one evaluation index may include a plurality of evaluation factors, after the weights of the evaluation indexes are obtained according to any one of the methods described above, for each evaluation index, the weights of the evaluation factors included in the evaluation index may be determined according to any one of the methods described above, and factor scores of the evaluation factors are determined, and then a sum value of products of the factor scores and the weights of the evaluation factors is taken as a restart index.
Step 104: and determining the restarting index of the target gas well according to the first index score of the evaluation index and the corresponding weight of the first index score.
The method can be realized by the following steps: for each evaluation index, determining the product of the first index score of the evaluation index and the corresponding weight of the first index score to obtain the second index score of the evaluation index; and summing the second index scores of the plurality of evaluation indexes to obtain a restarting index.
In one possible implementation, the restart index for the target gas well may be determined by the following equation one:
equation one:
wherein GT is a restart index, A i For evaluating the first index score of the index, K i For the weight of the evaluation index, i is the rank of the evaluation index, and n is the number of the evaluation indexes. The size of GT represents the restarting potential of the target gas well, and the value range is generally between 0 and 1, and the larger the GT value is, the larger the restarting potential of the target gas well is.
In the embodiment of the application, the true values of the evaluation indexes are converted into the index scores of the evaluation indexes through different evaluation methods, then the comprehensive evaluation parameters of all the evaluation indexes, namely the restarting index, are calculated by combining the weights of the evaluation indexes, and finally the restarting potential of the target gas well is judged according to the restarting index.
Step 105: and determining the restarting potential of the target gas well according to the magnitude relation between the restarting index and the first preset threshold value and the second preset threshold value.
In one possible implementation, when the restart index is greater than a first preset threshold, determining that the target gas well has restart potential; when the restarting index is larger than the second preset threshold value but not larger than the first preset threshold value, determining an alternative object for restarting the target gas well; and when the restarting index is not greater than a second preset threshold value, determining that the target gas well does not have restarting potential.
In one possible implementation manner, when the restart index is greater than a first preset threshold, a first restart report may be generated, where the first restart report indicates that the target gas well belongs to a class I well, and has restart potential; when the restart index is greater than a second preset threshold but not greater than the first preset threshold, a second restart report can be generated, wherein the second restart report shows that the target gas well belongs to a class II well and is an alternative object of restarting; when the restart index is not greater than the second preset threshold, a third restart report can be generated, and the third restart report shows that the target gas well belongs to a class III well and does not have restart potential. Therefore, related personnel can quickly determine whether the target gas well has restart potential according to the type of the restart report.
The first preset threshold and the second preset threshold may be set and changed as required, which is not specifically limited in the embodiment of the present application. For example, the first preset threshold is 0.5 and the second preset threshold is 0.3.
Referring to table 3, table 3 shows the restart index corresponding to a portion of the target gas wells calculated from the 129 target gas wells in the Sichuan basin according to the methods described in steps 101 through 104.
TABLE 3 Table 3
The weights corresponding to the target gas wells with different numbers are determined according to the actual conditions of the target gas wells with different numbers in table 3, and are not listed here. Taking the second preset threshold value of 0.5 and the third preset threshold value of 0.3 as an example for explanation, among 129 target gas wells in Sichuan basin, 54 wells with restarting index of more than 0.5 are arranged, and the main reasons of shutdown are large water yield, shutdown of a purification plant, poor benefit and the like, but certain residual dynamic reserves and productivity are provided. The restarting index is between 0.3 and 0.5, the wells have 65 ports, the main reasons for shutdown are large water yield, poor benefits and the like, but the residual dynamic reserves are less, and the productivity is low; wells with a restart index less than 0.3 have 10 wells with little dynamic reserves, low capacity and substantially no restart potential.
In the embodiment of the application, under the increasingly tense production situation, the target gas well with the restarting potential is restarted, so that the production pressure can be relieved, and the economic benefit can be improved. The method provided by the embodiment of the application is successfully applied to a mine field, and each production unit makes a restarting plan of a shut-down gas well according to the method and waits to be implemented.
According to the method for judging the restarting potential of the gas well, which is provided by the embodiment of the application, a plurality of evaluation indexes for judging the restarting potential of the target gas well are obtained, and a first index score of the evaluation indexes is determined by adopting a preset evaluation method; for each evaluation index, comparing the importance of the evaluation index with any other evaluation index in a plurality of evaluation indexes to obtain the weight corresponding to the evaluation index; determining a restarting index of the target gas well according to the first index score of the evaluation index and the corresponding weight of the first index score; and determining the restarting potential of the target gas well according to the magnitude relation between the restarting index and the first preset threshold value and the second preset threshold value. When the evaluation index is the remaining dynamic reserve, a first index score corresponding to the remaining dynamic reserve and the remaining dynamic reserve value of the last year when the target gas well was shut down and the limit value of the remaining dynamic reserve to be provided when the target gas well is restarted are determined. The method establishes a complete theoretical system, thereby determining the restarting potential of the target gas well according to the theoretical system, and compared with the method which only relies on subjective experience of related personnel, the method not only improves the accuracy of discrimination, but also expands the application range of the method.
The embodiment of the application provides a discriminating apparatus for restarting potential of a gas well, referring to fig. 3, the apparatus includes:
the obtaining module 301 is configured to obtain a plurality of evaluation indexes for discriminating a restart potential of a target gas well, where the target gas well is a shutdown gas well;
a first determining module 302, configured to determine a first index score of each evaluation index by using a preset evaluation method;
a comparison module 303, configured to compare, for each evaluation index, the importance of the evaluation index with any other evaluation index of the plurality of evaluation indexes, so as to obtain a weight corresponding to the evaluation index;
the second determining module 304 is configured to determine a restart index of the target gas well according to the first index score of the evaluation index and the weight corresponding to the first index score;
a third determining module 305, configured to determine a restart potential of the target gas well according to a magnitude relation between the restart index and the first preset threshold and the second preset threshold;
when the evaluation index is the remaining dynamic reserve, the first determining module 302 is further configured to obtain a remaining value of the remaining dynamic reserve of the last year in which the target gas well is shut down; acquiring a limit value of the residual dynamic reserve which the target gas well should have when being restarted; determining whether the ratio of the residual value to the limit value is smaller than a third preset threshold value; when the ratio is smaller than a third preset threshold value, taking the ratio of the residual value to the limit value as a first index score of the evaluation index; and when the ratio is not smaller than the third preset threshold value, taking the third preset threshold value as a first index score of the evaluation index.
In another possible implementation, when the evaluation index is that the target gas well contributes to the gas reservoir, the first determining module 302 is further configured to assign a first index score of 1 to the evaluation index when the contribution value of the target gas well to the gas reservoir contribution is greater than a preset contribution value; when the difference value between the contribution value of the target gas well to the gas reservoir contribution and the preset contribution value is in a preset range, the first index score of the evaluation index is 0.5; when the difference between the contribution value of the target gas well to the gas reservoir contribution and the preset contribution value is smaller than the preset range and the contribution value is smaller than the preset contribution value, the first index score of the evaluation index is 0.
In another possible implementation, the evaluation index further includes: annual water production, annual gas production, and costs associated with taking technical measures for a target gas well.
In another possible implementation manner, the second determining module 304 is further configured to determine, for each evaluation index, a product of a first index score of the evaluation index and a weight corresponding to the first index score, to obtain a second index score of the evaluation index; and summing the second index scores of the plurality of evaluation indexes to obtain a restarting index.
In another possible implementation manner, the third determining module 305 is further configured to determine that the target gas well has a restart potential when the restart index is greater than the first preset threshold; when the restarting index is larger than the second preset threshold value but not larger than the first preset threshold value, determining an alternative object for restarting the target gas well; and when the restarting index is not greater than a second preset threshold value, determining that the target gas well does not have restarting potential.
The judging device for the restarting potential of the gas well acquires a plurality of evaluation indexes for judging the restarting potential of the target gas well, and a first index score of the evaluation indexes is determined by adopting a preset evaluation method; for each evaluation index, comparing the importance of the evaluation index with any other evaluation index in a plurality of evaluation indexes to obtain the weight corresponding to the evaluation index; determining a restarting index of the target gas well according to the first index score of the evaluation index and the corresponding weight of the first index score; and determining the restarting potential of the target gas well according to the magnitude relation between the restarting index and the first preset threshold value and the second preset threshold value. When the evaluation index is the remaining dynamic reserve, a first index score corresponding to the remaining dynamic reserve and the remaining dynamic reserve value of the last year when the target gas well was shut down and the limit value of the remaining dynamic reserve to be provided when the target gas well is restarted are determined. The device establishes a complete theoretical system, thereby determining the restarting potential of the target gas well according to the theoretical system, and compared with the method which only relies on subjective experience of related personnel, the device not only improves the accuracy of discrimination, but also expands the application range.
The foregoing is merely for facilitating understanding of the technical solutions of the present application by those skilled in the art, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims (8)
1. A method for discriminating the restart potential of a gas well, the method comprising:
acquiring a plurality of evaluation indexes for judging restarting potential of a target gas well, wherein the target gas well is a shut-down gas well;
determining a first index score of each evaluation index by adopting a preset evaluation method;
for each evaluation index, comparing the importance of the evaluation index with any other evaluation index in the plurality of evaluation indexes to obtain a weight corresponding to the evaluation index;
determining a restarting index of the target gas well according to the first index score of the evaluation index and the corresponding weight of the first index score;
determining the restarting potential of the target gas well according to the magnitude relation between the restarting index and the first preset threshold value and the second preset threshold value;
when the evaluation index is the remaining dynamic reserve, determining a first index score of each evaluation index by adopting a preset evaluation method comprises the following steps:
acquiring a remaining value of a remaining dynamic reserve of the last year in which the target gas well was shut down;
obtaining a threshold value of remaining dynamic reserves which the target gas well should have when restarted;
determining whether the ratio of the remaining value to the limit value is less than a third preset threshold;
when the ratio is smaller than the third preset threshold value, taking the ratio of the residual value to the limit value as a first index score of the evaluation index;
when the ratio is not smaller than the third preset threshold value, the third preset threshold value is used as a first index score of the evaluation index;
when the evaluation index is the contribution of the target gas well to the gas reservoir, determining a first index score of the evaluation index by adopting a preset evaluation method comprises the following steps:
when the contribution value of the target gas well to the gas reservoir contribution is larger than a preset contribution value, giving a first index score of the evaluation index of 1;
when the difference value between the contribution value of the target gas well to the gas reservoir contribution and the preset contribution value is in a preset range, giving a first index score of the evaluation index of 0.5;
and when the difference value between the contribution value of the target gas well to the gas reservoir contribution and the preset contribution value is smaller than the preset range and the contribution value is smaller than the preset contribution value, giving a first index score of the evaluation index of 0.
2. The method of claim 1, wherein the evaluation index further comprises: annual water production, annual gas production, and costs associated with taking technical measures for the target gas well;
when the evaluation index is the annual water yield, determining a first index score of each evaluation index by adopting a preset evaluation method comprises the following steps:
acquiring annual water production of the last year in which the target gas well is shut down;
obtaining a maximum value of annual water production that the target gas well should have when restarted;
determining a first index score of the evaluation index according to the ratio of the annual water yield of the previous year to the maximum value;
when the evaluation index is the annual gas production, determining a first index score of each evaluation index by adopting a preset evaluation method comprises the following steps:
acquiring annual gas production of the last year in which the target gas well is shut down;
acquiring a minimum value of annual gas production that the target gas well should have when restarted;
determining a first index score of the evaluation index according to the ratio of the annual gas production of the last year to the minimum value;
when the evaluation index is the cost of the technical measures taken for the target gas well, determining a first index score of each evaluation index by adopting a preset evaluation method comprises the following steps:
when the cost of taking technical measures on the target gas well is less than a first preset cost, giving a first index score of 1 to the evaluation index;
when the cost of taking technical measures on the target gas well is greater than the first preset cost and less than the second preset cost, giving a first index score of 0.4 to the evaluation index;
and when the cost for taking technical measures on the target gas well is greater than the second preset cost, giving a first index score of 0 to the evaluation index.
3. The method of claim 1, wherein the determining the restart index for the target gas well based on the first indicator score for the evaluation indicator and its corresponding weight comprises:
for each evaluation index, determining the product of a first index score of the evaluation index and a corresponding weight of the first index score to obtain a second index score of the evaluation index;
and summing the second index scores of the plurality of evaluation indexes to obtain the restarting index.
4. The method of claim 1, wherein the determining the restart potential of the target gas well based on the magnitude relationship between the restart index and a first preset threshold and a second preset threshold comprises:
when the restarting index is larger than a first preset threshold value, determining that the target gas well has restarting potential;
when the restart index is greater than a second preset threshold value but not greater than the first preset threshold value, determining an alternative object for restarting the target gas well;
and when the restarting index is not greater than the second preset threshold value, determining that the target gas well does not have restarting potential.
5. A device for discriminating the restart potential of a gas well, the device comprising:
the acquisition module is used for acquiring a plurality of evaluation indexes for judging restarting potential of a target gas well, wherein the target gas well is a shut-down gas well;
the first determining module is used for determining a first index score of each evaluation index by adopting a preset evaluation method;
the comparison module is used for comparing the importance of each evaluation index with any other evaluation index in the plurality of evaluation indexes to obtain the weight corresponding to the evaluation index;
the second determining module is used for determining the restarting index of the target gas well according to the first index score of the evaluation index and the corresponding weight of the first index score;
the third determining module is used for determining the restarting potential of the target gas well according to the magnitude relation between the restarting index and the first preset threshold value and the second preset threshold value;
when the evaluation index is the residual dynamic reserve, the first determining module is further used for obtaining a residual value of the residual dynamic reserve of the last year that the target gas well was shut down; obtaining a threshold value of remaining dynamic reserves which the target gas well should have when restarted; determining whether the ratio of the remaining value to the limit value is less than a third preset threshold; when the ratio is smaller than the third preset threshold value, taking the ratio of the residual value to the limit value as a first index score of the evaluation index; when the ratio is not smaller than the third preset threshold value, the third preset threshold value is used as a first index score of the evaluation index;
when the evaluation index is the contribution of the target gas well to the gas reservoir, the first determining module is further configured to assign a first index score of 1 to the evaluation index when the contribution of the target gas well to the gas reservoir is greater than a preset contribution value; when the difference value between the contribution value of the target gas well to the gas reservoir contribution and the preset contribution value is in a preset range, giving a first index score of the evaluation index of 0.5; and when the difference value between the contribution value of the target gas well to the gas reservoir contribution and the preset contribution value is smaller than the preset range and the contribution value is smaller than the preset contribution value, giving a first index score of the evaluation index of 0.
6. The apparatus of claim 5, wherein the evaluation index further comprises: annual water production, annual gas production, and costs associated with taking technical measures for the target gas well;
when the evaluation index is the annual water yield, the first determining module is further used for acquiring the annual water yield of the last year in which the target gas well is shut down; obtaining a maximum value of annual water production that the target gas well should have when restarted; determining a first index score of the evaluation index according to the ratio of the annual water yield of the previous year to the maximum value;
when the evaluation index is the annual gas production, the first determining module is further used for acquiring the annual gas production of the last year in which the target gas well is shut down; acquiring a minimum value of annual gas production that the target gas well should have when restarted; determining a first index score of the evaluation index according to the ratio of the annual gas production of the last year to the minimum value;
when the evaluation index is the cost of taking the technical measures on the target gas well, the first determining module is further used for giving a first index score of 1 to the evaluation index when the cost of taking the technical measures on the target gas well is less than a first preset cost; when the cost of taking technical measures on the target gas well is greater than the first preset cost and less than the second preset cost, giving a first index score of 0.4 to the evaluation index; and when the cost for taking technical measures on the target gas well is greater than the second preset cost, giving a first index score of 0 to the evaluation index.
7. The apparatus of claim 5, wherein the second determining module is further configured to determine, for each evaluation index, a product of a first index score of the evaluation index and a weight corresponding to the first index score, to obtain a second index score of the evaluation index; and summing the second index scores of the plurality of evaluation indexes to obtain the restarting index.
8. The apparatus of claim 5, wherein the third determination module is further configured to determine that the target gas well has a restart potential when the restart index is greater than a first preset threshold; when the restart index is greater than a second preset threshold value but not greater than the first preset threshold value, determining an alternative object for restarting the target gas well; and when the restarting index is not greater than the second preset threshold value, determining that the target gas well does not have restarting potential.
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