CN112270067A - Method for evaluating new well dynamic reserve of tight gas reservoir - Google Patents
Method for evaluating new well dynamic reserve of tight gas reservoir Download PDFInfo
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Abstract
The invention belongs to the technical field of gas reservoir engineering, and particularly provides a method for evaluating dynamic reserve of a new tight gas reservoir well, which comprises the following steps: selecting a single well sample; the method comprises the following steps of performing fitting calculation on the dynamic reserve value of each production time period of a single-well sample during the production time period, solving the dynamic reserve accuracy rate of each production time period of the single-well sample according to the dynamic reserve value, and obtaining a change relation curve of the dynamic reserve accuracy rate of each production time period of the single-well sample along with time; establishing a dynamic reserve evaluation standard chart according to a change relation curve of the dynamic reserve accuracy rate of each production time period of the single well sample along with time; the method has the advantages that the accurate dynamic reserve value of the single well is obtained through calculation according to the dynamic reserve evaluation standard chart, the dynamic reserve value of the gas well at the initial stage of the operation of the tight sandstone gas reservoir is evaluated according to the accurate dynamic reserve value of the new well, the problem that the dynamic reserve of the gas well with short production time calculated by the conventional method is inaccurate is solved, and the accuracy of single-well index evaluation is improved.
Description
Technical Field
The invention belongs to the technical field of gas reservoir engineering, and particularly relates to a method for evaluating dynamic reserve of a new tight gas reservoir well.
Background
The accurate calculation of the gas reservoir or the single well dynamic reserve relates to the objective comprehensive evaluation of the gas reservoir, the yield of the gas well and the deployment of a development well pattern, is the basis of high-efficiency and scientific development of the gas field, is helpful for determining the extraction degree and the recovery ratio of the reservoir more accurately by calculating the dynamic reserve, and plays a vital role in further development of the gas well of the gas field and adjustment of a reasonable system in the future.
The pressure drop method is one of the commonly used methods for calculating the natural gas reserves, and the material balance method of the constant volume closed gas reservoir is the pressure drop method. The principle is that gas well equations of state and conservation of mass. The method is suitable for exploitation when the gas reservoir keeps balanced and the pressure in the gas reservoir synchronously drops, and is suitable for exploitation when the controlled dynamic reserve of the gas reservoir is 15%. The method has the advantages that the calculation result is relatively accurate and reliable, but the shut-in pressure measurement of the whole gas reservoir needs to be performed regularly in the exploitation process of the gas reservoir, so that the method can have certain influence on the production of the gas reservoir. The pressure drop method is a more accurate dynamic reserve calculation method for gas fields with more use.
The principle of the yield instability analysis method is that single well dynamic data are utilized to perform fitting calculation, mainly related data of yield and flowing pressure are used for performing material balance analysis, and then single well dynamic reserve is calculated. The method does not need to shut in and measure pressure, does not need fixed production or fixed pressure production, and can be carried out by only utilizing production data recorded comprehensively and accurately. The yield instability analysis method includes four common methods such as a Blasinamee method, an Agarwal-Gardner method, an NPI method, a Transient method and the like.
The elastic two-phase method principle is that a bounded enclosed formation well opening production bottom hole pressure drop curve can be generally divided into three sections: the first stage, referred to as the early stage of instability, is the elastic first stage before the pressure drop funnel does not pass to the boundary; the second segment is called late stage of instability, i.e. after the pressure drop funnel has passed to the boundary; the third stage is referred to as the pseudo-stationary phase, where the formation pressure drop is relatively stable. The pressure drop velocity at any point in the third section is the same, which is also called the elastic second phase process. The elastic two-phase method is applicable under the following conditions: the production well is ensured to reach a quasi-stable state, the well is not required to be shut down for pressure measurement, the production is not influenced, if the production system is unreasonable, a pseudo-stable state of the gas well can be caused, and the calculation result is smaller.
According to the principle of a yield accumulation method, according to actual production data of a gas well, the change relation between accumulated gas production rates Gp and t is as shown in the formula (1), when t → ∞ b/t → 0, then Gp ═ a, at the moment, a is a dynamic storage value.
The method has certain applicable conditions for calculating the dynamic reserve of the gas well, and meanwhile, as the reservoir of the Suliger gas field is compact and has strong heterogeneity, and the periphery has weak supply and the like, and continuous pressure measurement and well test interpretation results over the years prove that the control range of the gas well is gradually increased and the dynamic reserve is gradually increased along with the extension of production time; for a tight sandstone gas reservoir, the forecast reserves of different gas wells at different production times have different results, and the value of the dynamic reserves forecasted at the initial production stage of the gas well is inaccurate due to the limitation of the application range of the current methods, so that an accurate method for calculating the dynamic reserves of the gas well at the initial production stage of the tight sandstone gas reservoir is urgently needed.
Disclosure of Invention
The method for evaluating the dynamic reserve of the new tight gas reservoir aims to solve the problem that the dynamic reserve of the short gas well is inaccurate in production time calculation by the existing method in the prior art; the method aims to solve the problems that the value of the dynamic reserve predicted at the initial stage of gas well production is inaccurate due to the limitation of the application range in various methods in the prior art, an accurate method for calculating the dynamic reserve of a gas well at the initial stage of compact sandstone gas reservoir production is urgently needed, and the accuracy of the evaluation index of the single well dynamic reserve at the initial stage of compact sandstone gas reservoir production is improved.
Therefore, the invention provides a method for evaluating the dynamic reserve of a new tight gas reservoir well, which comprises the following steps:
1) selecting a single well sample;
2) the method comprises the following steps of performing fitting calculation on the dynamic reserve value of each production time period of a single-well sample during the production time period, solving the dynamic reserve accuracy rate of each production time period of the single-well sample according to the dynamic reserve value, and obtaining a change relation curve of the dynamic reserve accuracy rate of each production time period of the single-well sample along with time;
3) establishing a dynamic reserve evaluation standard chart according to a time-varying relation curve of the dynamic reserve accuracy rate of each production time period of the single-well sample in the step 2);
4) and calculating according to the dynamic reserve evaluation standard chart in the step 3) to obtain an accurate dynamic reserve value of the new well, and evaluating the dynamic reserve of the gas well at the initial stage of the compact sandstone gas reservoir production according to the accurate dynamic reserve value of the new well.
The single-well sample in the step 1) comprises a vertical well sample and a horizontal well sample, and the selection standard of the vertical well sample is as follows: the production time of each type of vertical well exceeds 12 years, and the number of each type of vertical well is more than 100; the selection standard of the horizontal well sample is as follows: the production time of each type of horizontal well exceeds 8 years, and the number of each type of horizontal well is more than 50; the single well sample needs normal production, the production data is complete and has no loss, and the production data at least comprises single well yield data and pressure data.
The production time period of the step 2) takes year as a reference time unit.
And 2) fitting and calculating the dynamic reserve value of each production time period of the single-well sample by adopting a yield instability analysis method, increasing the fitting data length by taking the year as a reference time unit according to the production history, and solving the dynamic reserve value of each production year of the single-well sample.
The specific method for solving the dynamic reserve accuracy rate of the single-well sample in each production time period in the step 2) is as follows: and taking the last year dynamic reserve value of the single-well sample as the accurate value of the single-well dynamic reserve, and calculating the proportion of the single-well historical dynamic reserve value in the accurate value, namely the dynamic reserve accuracy of the single-well sample in different production years.
And 3) establishing a dynamic reserve evaluation standard chart according to the change relation of the dynamic reserve accuracy rate of each production time period of the single-well sample in the step 2) along with time, and respectively establishing the dynamic reserve evaluation standard charts of the vertical well and the horizontal well under each type by counting the dynamic reserve accuracy rate of each type and each production year of the well type under all the single-well samples.
And 4) calculating the accurate dynamic reserve value of the single well in the step 4) by multiplying the dynamic reserve value of the predicted new well by the dynamic reserve accuracy rate of the single well, wherein the dynamic reserve accuracy rate of the single well is obtained by contrasting and inquiring the dynamic reserve evaluation standard chart in the step 3).
And the predicted new well dynamic reserve value is evaluated by adopting a yield instability analysis method at the current production stage of one single well.
And the dynamic reserve evaluation standard chart in the comparison query step 3) is compared and queried according to the well type, the type and the production time of a single well.
The invention has the beneficial effects that: the method for evaluating the dynamic reserve of the new tight gas reservoir well comprises the following steps: 1) selecting a single well sample; 2) the method comprises the following steps of performing fitting calculation on the dynamic reserve value of each production time period of a single-well sample during the production time period, solving the dynamic reserve accuracy rate of each production time period of the single-well sample according to the dynamic reserve value, and obtaining a change relation curve of the dynamic reserve accuracy rate of each production time period of the single-well sample along with time; 3) establishing a dynamic reserve evaluation standard chart according to a time-varying relation curve of the dynamic reserve accuracy rate of each production time period of the single-well sample in the step 2); 4) calculating according to the dynamic reserve evaluation standard chart in the step 3) to obtain an accurate dynamic reserve value of the new well; therefore, the method for evaluating the new well mobility reserve of the dense gas reservoir has the following beneficial effects:
1. the method establishes dynamic reserve evaluation standard charts of different types of vertical wells and horizontal wells of the tight sandstone gas reservoir, and the gas well can accurately evaluate the dynamic reserve value of a single well according to the dynamic reserve evaluation standard charts under any production stage condition;
2. the method is simple to apply, and after the current dynamic reserve value of the single well is obtained, the real value of the dynamic reserve can be obtained by inquiring the dynamic reserve evaluation standard chart and converting according to the corresponding proportion;
3. compared with other calculation results, the accurate dynamic reserve value of the new well obtained through calculation has higher accuracy rate of evaluating the dynamic reserve value of the gas well at the initial stage of the operation of the tight sandstone gas reservoir, and the result is more reliable.
Drawings
The present invention will be described in further detail below with reference to the accompanying drawings.
FIG. 1 shows the predicted dynamic reserve value and dynamic reserve accuracy for each production interval of SX1 well;
FIG. 2 is a graph of the dynamic reserve accuracy over time for each production interval in an SX1 well;
FIG. 3 is a chart of the dynamic reserve evaluation criteria for a vertical well;
fig. 4 is a chart of the dynamic reserve evaluation criteria of a horizontal well.
Detailed Description
Example 1:
a method for evaluating new well mobility reserves of a tight gas reservoir comprises the following steps:
1) selecting a single well sample;
2) the method comprises the following steps of performing fitting calculation on the dynamic reserve value of each production time period of a single-well sample during the production time period, solving the dynamic reserve accuracy rate of each production time period of the single-well sample according to the dynamic reserve value, and obtaining a change relation curve of the dynamic reserve accuracy rate of each production time period of the single-well sample along with time;
3) establishing a dynamic reserve evaluation standard chart according to a time-varying relation curve of the dynamic reserve accuracy rate of each production time period of the single-well sample in the step 2);
4) and calculating according to the dynamic reserve evaluation standard chart in the step 3) to obtain an accurate dynamic reserve value of the new well, and evaluating the dynamic reserve of the gas well at the initial stage of the compact sandstone gas reservoir production according to the accurate dynamic reserve value of the new well.
Example 2:
as shown in fig. 1-4, a method for evaluating new well mobility reserves of a tight gas reservoir comprises the following steps:
1) selecting a single well sample; the single-well sample in the step 1) comprises a vertical well sample and a horizontal well sample, and the selection standard of the vertical well sample is as follows: the production time of each type of vertical well exceeds 12 years, and the number of each type of vertical well is more than 100; the selection standard of the horizontal well sample is as follows: the production time of each type of horizontal well exceeds 8 years, and the number of each type of horizontal well is more than 50; the single-well sample needs normal production, the production data is complete and has no loss, and the production data at least comprises single-well yield data and pressure data;
2) the method comprises the following steps of performing fitting calculation on the dynamic reserve value of each production time period of a single-well sample during the production time period, solving the dynamic reserve accuracy rate of each production time period of the single-well sample according to the dynamic reserve value (see figure 1), and obtaining a change relation curve of the dynamic reserve accuracy rate of each production time period of the single-well sample along with time (see figure 2); the production time period in the step 2) takes year as a reference time unit; the step 2) of fitting and calculating the dynamic reserve value of each production time period of the single-well sample is to use a yield instability analysis method, increase the fitting data length by years as a reference time unit according to the production history, and obtain the dynamic reserve value of each production year of the single-well sample; the specific method for solving the dynamic reserve accuracy rate of the single-well sample in each production time period in the step 2) is as follows: and taking the last year dynamic reserve value of the single-well sample as the accurate value of the single-well dynamic reserve, and calculating the proportion of the single-well historical dynamic reserve value in the accurate value, namely the dynamic reserve accuracy of the single-well sample in different production years.
3) Establishing a dynamic reserve evaluation standard chart according to a time-varying relation curve of the dynamic reserve accuracy rate of each production time period of the single-well sample in the step 2); (see fig. 3 and 4) the step 3) of establishing the dynamic reserve evaluation standard chart needs to be according to the change relation of the dynamic reserve accuracy rate of each production time period of the single-well sample in the step 2) along with time, and the dynamic reserve evaluation standard charts of each type of vertical well and horizontal well are respectively established by counting the dynamic reserve accuracy rate of each type and each production year of the well type single well under all the single-well sample numbers.
4) And calculating according to the dynamic reserve evaluation standard chart in the step 3) to obtain the accurate dynamic reserve value of the new well. And 4) calculating the accurate dynamic reserve value of the single well in the step 4) by multiplying the dynamic reserve value of the predicted new well by the dynamic reserve accuracy rate of the single well, wherein the dynamic reserve accuracy rate of the single well is obtained by contrasting and inquiring the dynamic reserve evaluation standard chart in the step 3). And the predicted new well dynamic reserve value is evaluated by adopting a yield instability analysis method at the current production stage of one single well. And the dynamic reserve evaluation standard chart in the comparison query step 3) is compared and queried according to the well type, the type and the production time of a single well.
The method establishes dynamic reserve evaluation standard charts of different types of vertical wells and horizontal wells of the tight sandstone gas reservoir, and the gas well can accurately evaluate the dynamic reserve value of a single well according to the dynamic reserve evaluation standard charts under any production stage condition; the method is simple to apply, and after the current dynamic reserve value of the single well is obtained, the real value of the dynamic reserve can be obtained by inquiring the dynamic reserve evaluation standard chart and converting according to the corresponding proportion; compared with other calculation results, the method has the advantages that the calculation of the single-well dynamic reserve is more reliable, the accuracy rate of evaluating the single-well dynamic reserve is higher, and the method is more reliable.
Example 3:
the well is put into production at 5/31 days in 2009, and the well movement reserve is predicted to be 3410 x 10 by adopting a yield instability analysis method from the production to 5/31 days in 2010 (namely the production time is 1 year)4m3The accuracy rate of dynamic reserve of a vertical well dynamic reserve evaluation standard chart is 65%, and the dynamic reserve is calculated to be 3410/0.65-5247 x 10 by the dynamic reserve evaluation standard chart4m3(ii) a The well activity reserve is predicted to be 4992 multiplied by 10 by adopting a yield instability analysis method from 5 months to 31 days in 2014 (namely, the production time is 5 years)4m3The accuracy rate of dynamic reserve of the vertical well checking dynamic reserve evaluation standard chart is 95%, and the dynamic reserve is calculated to be 4992/0.95-5255 x 10 by the dynamic reserve evaluation standard chart4m3(ii) a The well activity reserves are predicted to be 5270X 10 by adopting a yield instability analysis method from 5 months to 31 days in 2018 (namely the production time is 9 years)4m3The accuracy of dynamic reserve of the vertical well checking dynamic reserve evaluation standard chart is basically 100%, and the dynamic reserve is calculated to be 5270/1.00-5270 multiplied by 10 through the dynamic reserve evaluation standard chart4m3(ii) a Calculating the well by dynamic reserve evaluation standard chartThe maximum error of the dynamic reserve is 0.4%, the accuracy rate of evaluating the dynamic reserve index of the vertical well is higher, and the method is more reliable.
Example 4:
and (3) putting a certain horizontal well into production in 5-15 months in 2012, and predicting the well kinetic reserve 18201 multiplied by 10 by adopting a yield instability analysis method from the production to 5-15 months in 2013 (namely the production time is 1 year)4m3The accuracy rate of checking dynamic reserve of horizontal well is 70%, and the dynamic reserve is calculated by dynamic reserve evaluation standard plate and is 18201/0.7-26001 × 104m3(ii) a The well activity reserves are predicted to be 25538X 10 by adopting a yield instability analysis method when the production reaches 5 months and 15 days (namely the production time is 3 years) 20154m3The accuracy rate of checking dynamic reserve of horizontal well is 98%, and the dynamic reserve is calculated by using dynamic reserve evaluation standard plate, and is 25538/0.98 ═ 26059X 104m3(ii) a The well-activity reserves are predicted to 26088 multiplied by 10 by adopting a yield instability analysis method from 5 months to 15 days in 2018 (namely the production time is 6 years)4m3The accuracy rate of dynamic reserve of the vertical well checking dynamic reserve evaluation standard chart is basically 100%, and the dynamic reserve is calculated to be 26088/1.00-26088 multiplied by 10 through the dynamic reserve evaluation standard chart4m3(ii) a The maximum error of the well dynamic reserve is calculated to be 0.3% through a dynamic reserve evaluation standard chart, the accuracy rate of evaluating the horizontal well dynamic reserve index is higher, and the method is more reliable.
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention, which is intended to be covered by the claims and any design similar or equivalent to the scope of the invention.
Claims (9)
1. A method for evaluating the new well dynamic reserve of a dense gas reservoir is characterized by comprising the following steps: the method comprises the following steps:
1) selecting a single well sample;
2) the method comprises the following steps of performing fitting calculation on the dynamic reserve value of each production time period of a single-well sample during the production time period, solving the dynamic reserve accuracy rate of each production time period of the single-well sample according to the dynamic reserve value, and obtaining a change relation curve of the dynamic reserve accuracy rate of each production time period of the single-well sample along with time;
3) establishing a dynamic reserve evaluation standard chart according to a time-varying relation curve of the dynamic reserve accuracy rate of each production time period of the single-well sample in the step 2);
4) and calculating according to the dynamic reserve evaluation standard chart in the step 3) to obtain an accurate dynamic reserve value of the new well, and evaluating the dynamic reserve of the gas well at the initial stage of the compact sandstone gas reservoir production according to the accurate dynamic reserve value of the new well.
2. The method of evaluating tight gas reservoir new well mobility reserves of claim 1, wherein: the single-well sample in the step 1) comprises a vertical well sample and a horizontal well sample, and the selection standard of the vertical well sample is as follows: the production time of each type of vertical well exceeds 12 years, and the number of each type of vertical well is more than 100; the selection standard of the horizontal well sample is as follows: the production time of each type of horizontal well exceeds 8 years, and the number of each type of horizontal well is more than 50; the single well sample needs normal production, the production data is complete and has no loss, and the production data at least comprises single well yield data and pressure data.
3. The method of evaluating tight gas reservoir new well mobility reserves of claim 1, wherein: the production time period of the step 2) takes year as a reference time unit.
4. The method of evaluating tight gas reservoir new well mobility reserves of claim 1, wherein: and 2) fitting and calculating the dynamic reserve value of each production time period of the single-well sample by adopting a yield instability analysis method, increasing the fitting data length by taking the year as a reference time unit according to the production history, and solving the dynamic reserve value of each production year of the single-well sample.
5. The method of evaluating tight gas reservoir new well mobility reserves of claim 1, wherein: the specific method for solving the dynamic reserve accuracy rate of the single-well sample in each production time period in the step 2) is as follows: and taking the last year dynamic reserve value of the single-well sample as the accurate value of the single-well dynamic reserve, and calculating the proportion of the single-well historical dynamic reserve value in the accurate value, namely the dynamic reserve accuracy of the single-well sample in different production years.
6. The method of evaluating tight gas reservoir new well mobility reserves of claim 1, wherein: and 3) establishing a dynamic reserve evaluation standard chart according to the change relation of the dynamic reserve accuracy rate of each production time period of the single-well sample in the step 2) along with time, and respectively establishing the dynamic reserve evaluation standard charts of the vertical well and the horizontal well under each type by counting the dynamic reserve accuracy rate of each type and each production year of the well type under all the single-well samples.
7. The method of evaluating tight gas reservoir new well mobility reserves of claim 1, wherein: and 4) calculating the accurate dynamic reserve value of the new well in the step 4) by multiplying the predicted dynamic reserve value of the new well by the dynamic reserve accuracy rate of the single well, wherein the dynamic reserve accuracy rate of the single well is obtained by contrasting and inquiring the dynamic reserve evaluation standard chart in the step 3).
8. The method of evaluating tight gas reservoir new wellbore mobility reserve of claim 7, wherein: and the predicted new well dynamic reserve value is evaluated by adopting a yield instability analysis method at the current production stage of one single well.
9. The method of evaluating tight gas reservoir new wellbore mobility reserve of claim 7, wherein: and the dynamic reserve evaluation standard chart in the comparison query step 3) is compared and queried according to the well type, the type and the production time of a single well.
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