CN111271054A - Evaluation and analysis method and device for fracturing effect of fractured carbonate reservoir - Google Patents
Evaluation and analysis method and device for fracturing effect of fractured carbonate reservoir Download PDFInfo
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- 238000011156 evaluation Methods 0.000 title claims abstract description 57
- 230000000694 effects Effects 0.000 title claims abstract description 55
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 title claims abstract description 49
- 238000004458 analytical method Methods 0.000 title claims abstract description 38
- 238000012360 testing method Methods 0.000 claims abstract description 223
- 239000007788 liquid Substances 0.000 claims abstract description 50
- 238000010276 construction Methods 0.000 claims abstract description 43
- 238000000034 method Methods 0.000 claims abstract description 39
- 238000002347 injection Methods 0.000 claims abstract description 33
- 239000007924 injection Substances 0.000 claims abstract description 33
- 238000005086 pumping Methods 0.000 claims abstract description 16
- 230000008569 process Effects 0.000 claims abstract description 15
- 238000004364 calculation method Methods 0.000 claims description 20
- 238000004590 computer program Methods 0.000 claims description 16
- 238000010606 normalization Methods 0.000 claims description 13
- 230000009466 transformation Effects 0.000 claims description 13
- 239000012530 fluid Substances 0.000 claims description 8
- 238000003860 storage Methods 0.000 claims description 7
- 150000001875 compounds Chemical class 0.000 claims description 3
- 230000006872 improvement Effects 0.000 abstract description 3
- 238000012986 modification Methods 0.000 description 11
- 230000004048 modification Effects 0.000 description 11
- 206010017076 Fracture Diseases 0.000 description 9
- 238000010586 diagram Methods 0.000 description 9
- 208000010392 Bone Fractures Diseases 0.000 description 7
- 238000012545 processing Methods 0.000 description 7
- 238000006073 displacement reaction Methods 0.000 description 6
- 230000006870 function Effects 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 229920002907 Guar gum Polymers 0.000 description 1
- 238000012351 Integrated analysis Methods 0.000 description 1
- 208000013201 Stress fracture Diseases 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 229960002154 guar gum Drugs 0.000 description 1
- 235000010417 guar gum Nutrition 0.000 description 1
- 239000000665 guar gum Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
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- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
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Abstract
The invention discloses an evaluation and analysis method and a device for the fracturing effect of a fractured carbonate reservoir, wherein the method comprises the following steps: performing multiple pumping stop tests to obtain multiple pumping stop pressure test values under different well injection liquid quantities and different pumping stop times; performing multiple pressure drop tests to obtain multiple pressure drop test values under different well injection liquid quantities and the same pump stopping time; obtaining the yield of the modified test well; and evaluating and analyzing the fracturing effect of the fractured carbonate reservoir of the construction well by using the pump-stopping pressure test value, the pressure drop test value and the yield of the modified test well. The method can complete evaluation and analysis of the fracturing effect of the fractured carbonate reservoir, namely the improvement effect of the reservoir is evaluated and analyzed, and the method is reliable in principle and simple in process.
Description
Technical Field
The invention relates to the technical field of yield increasing transformation of oil and gas wells, in particular to a method and a device for evaluating and analyzing the fracturing effect of a fractured carbonate reservoir.
Background
For the reservoir transformation of a high-temperature, deep-layer and fractured carbonate reservoir, the improvement of the fracture communication volume is the core content of the transformation, the fracture is the necessary condition for high yield of the fractured carbonate oil and gas reservoir, the realization of the communication of multi-scale fractures (the combination of micro-fractures and nearby large-scale fractures) is the guarantee for improving the transformation effect, and the evaluation and analysis of the fracturing effect of the fractured carbonate reservoir are necessary for improving the overall level of the fracturing of the carbonate.
In the related technology, lipshuai, Dingyunmao and the like published in the journal of scientific technology and engineering of 2016 and 12 months, "volume reconstruction fracturing design based on small-scale pressure measurement analysis", fracture parameters under different models are inverted through net pressure fitting and compared with microseism data, the reconstruction effect of a fracture reservoir can be analyzed, but a large amount of data and matched testing means are needed on site, and the flow is complex.
Disclosure of Invention
The embodiment of the invention provides an evaluation and analysis method for the fracturing effect of a fractured carbonate reservoir, which is used for evaluating and analyzing the fracturing effect of the fractured carbonate reservoir and ensuring reliable principle and simple flow, and comprises the following steps:
performing multiple pumping stop tests to obtain multiple pumping stop pressure test values under different well injection liquid quantities and different pumping stop times;
performing multiple pressure drop tests to obtain multiple pressure drop test values under different well injection liquid quantities and the same pump stopping time;
obtaining the yield of the modified test well;
and evaluating and analyzing the fracturing effect of the fractured carbonate reservoir of the construction well by using the pump-stopping pressure test value, the pressure drop test value and the yield of the modified test well.
Optionally, the evaluation and analysis of the fracturing effect of the fractured carbonate reservoir of the construction well is performed by using the pump-stopping pressure test value, the pressure drop test value and the output of the modified test well, and the evaluation and analysis comprises the following steps:
acquiring a reference value of construction well evaluation;
and calculating an evaluation value of the construction well by using the pump-stopping pressure test value, the pressure drop test value and the yield of the modified test well, comparing the reference value with the evaluation value, and evaluating and analyzing the fracturing effect of the fractured carbonate reservoir of the construction well according to the comparison result.
Optionally, carry out the test of stopping the pump many times, obtain a plurality of pump stopping pressure test values under different injection well liquid measure, different pump stopping time, include:
dividing the liquid amount of the injection well into multiple parts, performing fracturing operation by using each part of liquid amount, and performing a pump stopping test when the liquid amount of the injection well reaches a preset value to obtain a pump stopping pressure test value;
pump-off pressure test value Pistp(Vi) The calculation formula of (a) is as follows:
wherein i is 1,2,3 … …, V0H is the middle depth of the reservoir of the target zone of the fracturing operation, ViThe amount of well fluid injected in the i-th pump stop, m3，PiThe bottom hole pressure is the bottom hole pressure when the well injection liquid amount reaches a preset value in the fracturing operation process;
Pi＝Piw+Ph
Piwthe pressure of the well head at the i-th pump stop is MPa and PhIs the liquid column pressure, MPa.
Optionally, after the pump stopping pressure test value is obtained, the pump stopping pressure test value is normalized.
Optionally, the normalization process for the pump-off pressure test value includes:
performing multiple pump stopping tests on one well, calculating pump stopping pressure test values in each pump stopping period, and forming a pump stopping pressure test value database;
calculating a normalized pump stopping pressure test value according to the pump stopping pressure test value database parameters, and normalizing the pump stopping pressure test value Pistp normalization(Vi) The calculation formula of (a) is as follows:
wherein, PistpTo normalize the previous values, maxPistpFor maximum parameter value, minP, in the pump-off pressure test value databaseistpThe minimum parameter value in the database of the pump-deactivation pressure test value is used.
Optionally, a pump-off pressure drop test value PD(Vi) The calculation formula of (a) is as follows:
wherein i is 1,2,3 … …, V0＝0，ViThe amount of well fluid injected in the i-th pump stop, m3，Pi，tIs the wellhead pressure after the pressure drop t time after the ith pump stop, PiThe bottom hole pressure is the bottom hole pressure when the well injection liquid amount reaches a preset value in the fracturing operation process;
Pi＝Piw+Ph
Piwthe pressure of the well head at the i-th pump stop is MPa and PhFor liquid column pressure, MPa。
Optionally, after the pump stopping pressure drop test value is obtained, the pump stopping pressure drop test value is subjected to normalization processing.
Optionally, the normalization process of the pump-stopping pressure drop test value includes:
performing multiple pressure drop tests on one well, calculating pump stopping pressure drop test values during each pump stopping period, and forming a pump stopping pressure drop test value database;
calculating a normalized pump stopping pressure drop test value according to the pump stopping pressure drop test value database parameters, and normalizing the pump stopping pressure drop test value PD normalization(Vi,Ti) The calculation formula of (a) is as follows:
wherein, PistpTo normalize the previous values, maxPistpFor maximum parameter value, minP, in the pump-off pressure test value databaseistpThe minimum parameter value in the database of the pump-deactivation pressure test value is used.
Optionally, evaluation value FindexThe calculation formula of (a) is as follows:
Findex＝Q×Ffracture
wherein Q is the stable yield of the modified test well, m3/d。FfractureThe calculation formula for the comprehensive fracturing transformation factor is as follows:
in the formula (I), the compound is shown in the specification,
to normalize the average of the pump-off pressure test values,
as an average of normalized pump-off pressure drop test values, W1Is dimensionless stopWeight coefficient of pump pressure test value, W2The weight coefficient is the test value of the dimensionless stop pump pressure drop.
The embodiment of the invention also provides an evaluation and analysis device for the fracturing effect of the fractured carbonate reservoir, which is used for evaluating and analyzing the fracturing effect of the fractured carbonate reservoir and ensuring reliable principle and simple flow, and the device comprises:
the pump stopping test module is used for carrying out multiple pump stopping tests to obtain multiple pump stopping pressure test values under different well injection liquid quantities and different pump stopping times;
the pressure drop test module is used for carrying out multiple pressure drop tests to obtain multiple pressure drop test values under different well injection liquid quantities and the same pump stopping time;
the yield acquisition module is used for acquiring the yield of the modified test well;
and the evaluation analysis module is used for evaluating and analyzing the fracturing effect of the fractured carbonate reservoir of the construction well by utilizing the pump stopping pressure test value, the pressure drop test value and the yield of the modified test well.
Optionally, the evaluation analysis module is further configured to:
acquiring a reference value of construction well evaluation;
and calculating a construction well evaluation value by using the pump-stopping pressure test value, the pressure drop test value and the yield of the modified test well, and evaluating and analyzing the fracturing effect of the fractured carbonate reservoir of the construction well by using the evaluation value.
The embodiment of the present invention further provides a computer device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the method when executing the computer program.
An embodiment of the present invention further provides a computer-readable storage medium, in which a computer program for executing the above method is stored.
According to the evaluation and analysis method for the fracturing effect of the fractured carbonate reservoir provided by the embodiment of the invention, the pump stopping pressure test value and the pressure drop test value are obtained by performing the pump stopping test and the pressure drop test for multiple times in the reservoir fracturing operation, and the evaluation and analysis of the fracturing effect of the fractured carbonate reservoir can be completed by utilizing the pump stopping pressure test value, the pressure drop test value and the yield of the test well after modification, namely the modification effect of the reservoir is evaluated and analyzed, so that the principle is reliable, and the flow is simple.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts. In the drawings:
FIG. 1 is a schematic flow chart of an evaluation and analysis method for fracture effect of a fractured carbonate reservoir in an embodiment of the invention;
fig. 2 is a schematic diagram of an evaluation and analysis device for the fracturing effect of a fractured carbonate reservoir in the embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
The embodiment of the invention provides an evaluation and analysis method for the fracturing effect of a fractured carbonate reservoir, which comprises the following steps of:
and 101, performing multiple pumping stop tests to obtain multiple pumping stop pressure test values under different well injection liquid quantities and different pumping stop times.
And 102, performing multiple pressure drop tests to obtain multiple pressure drop test values under different well injection liquid quantities and the same pump stopping time.
And 103, obtaining the yield of the modified test well.
And 104, evaluating and analyzing the fracturing effect of the fractured carbonate reservoir of the construction well by using the pump stopping pressure test value, the pressure drop test value and the output of the test well after modification.
According to the evaluation and analysis method for the fracturing effect of the fractured carbonate reservoir provided by the embodiment of the invention, the pump stopping pressure test value and the pressure drop test value are obtained by performing the pump stopping test and the pressure drop test for multiple times in the reservoir fracturing operation, and the evaluation and analysis of the fracturing effect of the fractured carbonate reservoir can be completed by utilizing the pump stopping pressure test value, the pressure drop test value and the yield of the test well after modification, namely the modification effect of the reservoir is evaluated and analyzed, so that the principle is reliable, and the flow is simple.
Wherein, the well injection liquid can be fracturing fluid, acid liquor and the like. The pump-off pressure test value may also be referred to as a "pump-off pressure recombination factor" and the pressure drop test value may also be referred to as a "pressure drop factor".
In order to combine the output after the test well is reformed, carry out evaluation analysis to fracture type carbonate reservoir fracturing effect accurately, utilize the output after pump stopping pressure test value, pressure drop test value and the test well is reformed, carry out evaluation analysis of fracture type carbonate reservoir fracturing effect to the construction well, include:
acquiring a reference value of construction well evaluation;
and calculating an evaluation value of the construction well by using the pump-stopping pressure test value, the pressure drop test value and the yield of the modified test well, comparing the reference value with the evaluation value, and evaluating and analyzing the fracturing effect of the fractured carbonate reservoir of the construction well according to the comparison result.
Here, the "evaluation value" may also be referred to as an "integrated analysis factor".
For step 101, in order to obtain a plurality of pumping stop pressure test values under different conditions to ensure the accuracy of the evaluation analysis, a plurality of pumping stop tests are performed to obtain a plurality of pumping stop pressure test values under different well injection amounts and different pumping stop times, including:
dividing the liquid amount of the injection well into multiple parts, performing fracturing operation by using each part of liquid amount, and performing a pump stopping test when the liquid amount of the injection well reaches a preset value to obtain a pump stopping pressure test value;
pump-off pressure test value Pistp(Vi) The calculation formula of (a) is as follows:
wherein i is 1,2,3 … …, V0H is the middle depth of the reservoir of the target zone of the fracturing operation, ViThe amount of well fluid injected in the i-th pump stop, m3，PiThe bottom hole pressure is the bottom hole pressure when the well injection liquid amount reaches a preset value in the fracturing operation process;
Pi＝Piw+Ph
Piwthe pressure of the well head at the i-th pump stop is MPa and PhIs the liquid column pressure, MPa.
Based on the above, in order to simplify the calculation, the pump stopping pressure test value is quickly obtained, and after the pump stopping pressure test value is obtained, the pump stopping pressure test value is subjected to normalization processing.
Specifically, the normalization process for the pump-off pressure test value includes:
performing multiple pump stopping tests on one well, calculating pump stopping pressure test values in each pump stopping period, and forming a pump stopping pressure test value database;
calculating a normalized pump stopping pressure test value according to the pump stopping pressure test value database parameters, and normalizing the pump stopping pressure test value Pistp normalization(Vi) The calculation formula of (a) is as follows:
wherein, PistpTo normalize the previous values, maxPistpFor maximum parameter value, minP, in the pump-off pressure test value databaseistpThe minimum parameter value in the database of the pump-deactivation pressure test value is used.
For step 102, the pump-stopping pressure drop test values under a plurality of different conditions are obtained to ensureThe accuracy of the evaluation analysis is obtained, and the pump stopping pressure drop test value PD(Vi) The calculation formula of (a) is as follows:
wherein i is 1,2,3 … …, V0＝0，ViThe amount of well fluid injected in the i-th pump stop, m3，Pi，tIs the wellhead pressure after the pressure drop t time after the ith pump stop, PiThe bottom hole pressure is the bottom hole pressure when the well injection liquid amount reaches a preset value in the fracturing operation process;
Pi＝Piw+Ph
Piwthe pressure of the well head at the i-th pump stop is MPa and PhIs the liquid column pressure, MPa.
At this time, the comprehensive fracturing modification factor FfractureThe formula is as follows:
based on the above, in order to simplify the calculation, the pump stopping pressure drop test value is quickly obtained, and after the pump stopping pressure drop test value is obtained, the pump stopping pressure drop test value is subjected to normalization processing.
Specifically, the normalization process of the pump-stopping pressure drop test value comprises the following steps:
performing multiple pressure drop tests on one well, calculating pump stopping pressure drop test values during each pump stopping period, and forming a pump stopping pressure drop test value database;
calculating a normalized pump stopping pressure drop test value according to the pump stopping pressure drop test value database parameters, and normalizing the pump stopping pressure drop test value PD normalization(Vi,Ti) The calculation formula of (a) is as follows:
wherein, PistpTo normalize the previous values, maxPistpFor maximum parameter value, minP, in the pump-off pressure test value databaseistpThe minimum parameter value in the database of the pump-deactivation pressure test value is used.
In the embodiment of the present invention, the evaluation value FindexThe calculation formula of (a) is as follows:
Findex＝Q×Ffracture
wherein Q is the stable yield of the modified test well, m3/d。
FfractureThe calculation formula for the comprehensive fracturing transformation factor is as follows:
in the formula (I), the compound is shown in the specification,
to normalize the average of the pump-off pressure test values,
as an average of normalized pump-off pressure drop test values, W1Weight coefficient of dimensionless pump-off pressure test value, W2The weight coefficient is the test value of the dimensionless stop pump pressure drop.
FindexLarger values indicate better reservoir modification. Using the analysis-by-synthesis factor FindexPerforming real-time comparative analysis on the subsequent construction well, and if the obtained F is obtainedindexEnlarging, which shows that the adopted fracturing measure is better, is beneficial to improving the reservoir transformation effect, if the obtained FindexAnd the size is reduced, and process technology analysis and construction parameter adjustment are required. By a plurality of FindexThe database can analyze the transformation effect of the whole block, and further can be popularized to reservoir transformation optimization design of basins and similar reservoirs.
Based on the same inventive concept, the embodiment of the invention also provides an evaluation and analysis device for the fracturing effect of the fractured carbonate reservoir, which is described in the following embodiment. Because the principle of the evaluation and analysis device for the fracturing effect of the fractured carbonate reservoir is similar to the evaluation and analysis method for the fracturing effect of the fractured carbonate reservoir, the implementation of the evaluation and analysis device for the fracturing effect of the fractured carbonate reservoir can refer to the implementation of the evaluation and analysis method for the fracturing effect of the fractured carbonate reservoir, and repeated parts are not repeated. As used hereinafter, the term "unit" or "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.
The embodiment of the invention provides an evaluation and analysis device for the fracturing effect of a fractured carbonate reservoir, as shown in the attached figure 2, the device comprises:
the pump stopping test module 201 is used for performing multiple pump stopping tests to obtain multiple pump stopping pressure test values under different well injection liquid quantities and different pump stopping times;
the pressure drop testing module 202 is used for performing multiple pressure drop tests to obtain multiple pressure drop test values under different well injection liquid quantities and the same pump stopping time;
the yield obtaining module 203 is used for obtaining the yield of the modified test well;
and the evaluation analysis module 204 is used for evaluating and analyzing the fracturing effect of the fractured carbonate reservoir of the construction well by utilizing the pump stopping pressure test value, the pressure drop test value and the yield of the modified test well.
In one embodiment, the assessment analysis module 204 is further configured to:
acquiring a reference value of construction well evaluation;
and calculating a construction well evaluation value by using the pump-stopping pressure test value, the pressure drop test value and the yield of the modified test well, and evaluating and analyzing the fracturing effect of the fractured carbonate reservoir of the construction well by using the evaluation value.
The embodiment of the present invention further provides a computer device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the above method when executing the computer program.
An embodiment of the present invention further provides a computer-readable storage medium, in which a computer program for executing the above method is stored.
The invention is illustrated below by taking a certain carbonate fractured reservoir reconstruction as an example:
the well reconstruction parameters are as follows: co-directional well injection of 2000m3Liquid, construction displacement 10m3Min, the injected liquid is guar gum, wherein the first 1000m3Liquid injection rate of 250m3The pump was stopped for a total of 4 times, each for 15 minutes. The well injection liquid amount reaches 1000m3Last every 500m3The pump is stopped once, and the pump is stopped 6 times in total. The test results are shown in Table 1.
The pump stopping method with different injection liquid amounts and times is adopted for multiple times to test the pump stopping pressure under different liquid amounts and times, and the pump stopping pressure test values P under different liquid amounts and times are obtainedistp(Vi). And (4) performing construction according to the amount of each liquid, and performing a pump stopping test when the construction reaches the designed amount, wherein the test time is generally 15 minutes. Using the formula Pi＝Piw+Ph(wherein, PiwThe pressure of the well head at the i-th pump stop is MPa and PhLiquid column pressure, MPa), the bottom hole pressure at each time was calculated. Reuse of
The formula calculates the pump-stopping pressure test value.
TABLE 1
Performing pressure drop test under different pump stopping conditions, and obtaining pressure drop test values P with different liquid amounts and the same pump stopping time according to the test results shown in Table 2D(Vi)。
TABLE 2
According to the reservoir characteristics of the block, as shown in Table 3, a weighting factor W of the dimensionless pumping-off pressure test value is selected10.4, no-dimensional pump-off pressure drop test value2Using the pump-off pressure test value obtained in table 1 and the pressure drop test value obtained in table 2, the comprehensive fracturing modification factor F was obtained using the formula ═ 0.6fracture＝0.246。
TABLE 3
And collecting the yield of the well after the transformation, wherein the yield of the well after the transformation is 75 square/day, the yield of the well after the pressure of the well is 9 ten thousand square/day, and the equivalent of oil gas is converted into 165 square/day. The calculated evaluation value was 165 × 0.246 — 40.59.
Establishing an evaluation value F of the yield after transformation and the effect after transformationindex40.59. The comprehensive analysis factors are utilized to compare the subsequent 3 wells, and the comprehensive factors 75.35, 86.5, 35.4 and 87.7 under different scales are obtained through analysis. The comparison shows that the construction liquid quantity of the first well for subsequent construction is 1800m3Construction displacement of 14m3A/min, and the second well increases the liquid dosage to 2500m3Construction displacement is increased to 14m3Min, the comprehensive factor after pressing reaches 86.5, and the construction scale of the corresponding third well is 1500m3Construction displacement of 10m3Min, and the construction liquid quantity of the fourth well reaches 3000m3Construction displacement of 14m3Min, but the increase of the comprehensive factor becomes smaller, which shows that the reasonable scale of the block is 2500m3Construction displacement of 14m3The/min is more reasonable. Utilizing the conclusion to carry out construction parameters on subsequent wellsAnd the subsequent scheme design of the block well is guided by scale optimization.
In conclusion, the method has quantitative knowledge on the fracturing evaluation effect of the fractured carbonate reservoir, and can provide a guide basis for the fracturing scale, the fracturing process and the fracturing material selection according to the evaluation value index of the obtained post-fracturing effect in the integral fracturing design. From the analysis of the field test condition and effect, the method is reasonable in concept and remarkable in effect, successfully solves the problem in the fracturing process of the fractured carbonate reservoir, and improves the fracturing modification power and the fracturing modification effect of the fractured carbonate reservoir.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (13)
1. A method for evaluating and analyzing the fracturing effect of a fractured carbonate reservoir is characterized by comprising the following steps:
performing multiple pumping stop tests to obtain multiple pumping stop pressure test values under different well injection liquid quantities and different pumping stop times;
performing multiple pressure drop tests to obtain multiple pressure drop test values under different well injection liquid quantities and the same pump stopping time;
obtaining the yield of the modified test well;
and evaluating and analyzing the fracturing effect of the fractured carbonate reservoir of the construction well by using the pump-stopping pressure test value, the pressure drop test value and the yield of the modified test well.
2. The method of claim 1, wherein the evaluating and analyzing the fracturing effect of the fractured carbonate reservoir on the construction well by using the pump-down pressure test value, the pressure drop test value and the yield after the well is transformed comprises:
acquiring a reference value of construction well evaluation;
and calculating an evaluation value of the construction well by using the pump-stopping pressure test value, the pressure drop test value and the yield of the modified test well, comparing the reference value with the evaluation value, and evaluating and analyzing the fracturing effect of the fractured carbonate reservoir of the construction well according to the comparison result.
3. The method of claim 1, wherein performing a plurality of pump shutdown tests to obtain a plurality of pump shutdown pressure test values for different amounts of fluid injected into the well and different pump shutdown times comprises:
dividing the liquid amount of the injection well into multiple parts, performing fracturing operation by using each part of liquid amount, and performing a pump stopping test when the liquid amount of the injection well reaches a preset value to obtain a pump stopping pressure test value;
pump-off pressure test value Pistp(Vi) The calculation formula of (a) is as follows:
wherein i is 1,2,3 … …, V0H is the middle depth of the reservoir of the target zone of the fracturing operation, ViThe amount of well fluid injected in the i-th pump stop, m3，PiThe bottom hole pressure is the bottom hole pressure when the well injection liquid amount reaches a preset value in the fracturing operation process;
Pi＝Piw+Ph
Piwthe pressure of the well head at the i-th pump stop is MPa and PhIs the liquid column pressure, MPa.
4. The method of claim 3, wherein the deactivated pressure test value is normalized after the deactivated pressure test value is obtained.
5. The method of claim 4, wherein normalizing the stopped-pump pressure test value comprises:
performing multiple pump stopping tests on one well, calculating pump stopping pressure test values in each pump stopping period, and forming a pump stopping pressure test value database;
calculating a normalized pump stopping pressure test value according to the pump stopping pressure test value database parameters, and normalizing the pump stopping pressure test value Pistp normalization(Vi) The calculation formula of (a) is as follows:
wherein, PistpTo normalize the previous values, maxPistpFor maximum parameter value, minP, in the pump-off pressure test value databaseistpThe minimum parameter value in the database of the pump-deactivation pressure test value is used.
6. Method according to claim 5, characterized in that the pump-off pressure drop test value PD(Vi) The calculation formula of (a) is as follows:
wherein i is 1,2,3 … …, V0＝0，ViThe amount of well fluid injected in the i-th pump stop, m3，Pi，tIs the wellhead pressure after the pressure drop t time after the ith pump stop, PiThe bottom hole pressure is the bottom hole pressure when the well injection liquid amount reaches a preset value in the fracturing operation process;
Pi＝Piw+Ph
Piwthe pressure of the well head at the i-th pump stop is MPa and PhIs the liquid column pressure, MPa.
7. The method of claim 6, wherein the pump-off pressure drop test value is normalized after the pump-off pressure drop test value is obtained.
8. The method of claim 7, wherein normalizing the stopped pump pressure drop test value comprises:
performing multiple pressure drop tests on one well, calculating pump stopping pressure drop test values during each pump stopping period, and forming a pump stopping pressure drop test value database;
calculating a normalized pump stopping pressure drop test value according to the pump stopping pressure drop test value database parameters, and normalizing the pump stopping pressure drop test value PD normalization(Vi,Ti) The calculation formula of (a) is as follows:
wherein, PistpTo normalize the previous values, maxPistpFor maximum parameter value, minP, in the pump-off pressure test value databaseistpThe minimum parameter value in the database of the pump-deactivation pressure test value is used.
9. The method of claim 8, wherein the evaluation value F isindexThe calculation formula of (a) is as follows:
Findex＝Q×Ffracture
wherein Q is the stable yield of the modified test well, m3/d，FfractureThe calculation formula for the comprehensive fracturing transformation factor is as follows:
in the formula (I), the compound is shown in the specification,
to normalize the average of the pump-off pressure test values,
as an average of normalized pump-off pressure drop test values, W1Weight coefficient of dimensionless pump-off pressure test value, W2The weight coefficient is the test value of the dimensionless stop pump pressure drop.
10. An evaluation and analysis device for fracture effect of fractured carbonate reservoir is characterized by comprising:
the pump stopping test module is used for carrying out multiple pump stopping tests to obtain multiple pump stopping pressure test values under different well injection liquid quantities and different pump stopping times;
the pressure drop test module is used for carrying out multiple pressure drop tests to obtain multiple pressure drop test values under different well injection liquid quantities and the same pump stopping time;
the yield acquisition module is used for acquiring the yield of the modified test well;
and the evaluation analysis module is used for evaluating and analyzing the fracturing effect of the fractured carbonate reservoir of the construction well by utilizing the pump stopping pressure test value, the pressure drop test value and the yield of the modified test well.
11. The apparatus of claim 10, wherein the assessment analysis module is further to:
acquiring a reference value of construction well evaluation;
and calculating a construction well evaluation value by using the pump-stopping pressure test value, the pressure drop test value and the yield of the modified test well, and evaluating and analyzing the fracturing effect of the fractured carbonate reservoir of the construction well by using the evaluation value.
12. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method of any of claims 1 to 9 when executing the computer program.
13. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program for executing the method of any one of claims 1 to 9.
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