CN111271054B - Evaluation analysis method and device for fracture effect of fractured carbonate reservoir - Google Patents
Evaluation analysis method and device for fracture effect of fractured carbonate reservoir Download PDFInfo
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- 238000011156 evaluation Methods 0.000 title claims abstract description 68
- 230000000694 effects Effects 0.000 title claims abstract description 56
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 title claims abstract description 48
- 238000004458 analytical method Methods 0.000 title claims abstract description 47
- 238000012360 testing method Methods 0.000 claims abstract description 228
- 239000007788 liquid Substances 0.000 claims abstract description 67
- 238000002347 injection Methods 0.000 claims abstract description 48
- 239000007924 injection Substances 0.000 claims abstract description 48
- 238000010276 construction Methods 0.000 claims abstract description 42
- 238000000034 method Methods 0.000 claims abstract description 41
- 230000009466 transformation Effects 0.000 claims abstract description 28
- 238000004364 calculation method Methods 0.000 claims description 23
- 238000004590 computer program Methods 0.000 claims description 16
- 230000008569 process Effects 0.000 claims description 16
- 238000012986 modification Methods 0.000 claims description 9
- 230000004048 modification Effects 0.000 claims description 9
- 238000010606 normalization Methods 0.000 claims description 8
- 238000003860 storage Methods 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 208000010392 Bone Fractures Diseases 0.000 description 34
- 206010017076 Fracture Diseases 0.000 description 34
- 238000010586 diagram Methods 0.000 description 7
- 238000012545 processing Methods 0.000 description 6
- 230000006870 function Effects 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 4
- 230000006872 improvement Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002407 reforming Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 229920002907 Guar gum Polymers 0.000 description 1
- 208000013201 Stress fracture Diseases 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- -1 carbonate hydrocarbon Chemical class 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 239000002131 composite material Substances 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
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000009420 retrofitting Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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Abstract
The invention discloses an evaluation analysis method and device for the fracturing effect of a fractured carbonate reservoir, wherein the method comprises the following steps: performing multiple pump stopping tests to obtain multiple pump stopping pressure test values under different injection well liquid amounts and different pump stopping times; performing multiple pressure drop tests to obtain multiple pressure drop test values of different well injection amounts and the same pump stop time; obtaining the output of the test well after transformation; and (3) carrying out evaluation analysis on 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 test well after transformation. The invention can complete the evaluation and analysis of the fracturing effect of the fractured carbonate reservoir, namely the reconstruction effect of the reservoir, and has reliable principle and simple flow.
Description
Technical Field
The invention relates to the technical field of oil and gas well yield increase transformation, in particular to an evaluation analysis method and device for the fracturing effect of a fractured carbonate reservoir.
Background
For reservoir reformation of high-temperature, deep and fractured carbonate reservoirs, improving the fracture communication volume is the core content of reformation, the fracture is a necessary condition for high yield of a fractured carbonate hydrocarbon reservoir, realizing multi-scale fracture (combination of micro-fracture and nearby large-scale fracture) communication is a guarantee for improving the reformation effect, and in order to improve the overall level of carbonate fracturing, it is necessary to evaluate and analyze the fracture effect of the fractured carbonate reservoir.
In the related technology, li Shuai, ding Yunhong and the like in the journal of 'science and technology and engineering' of the year 2016 published 'volume transformation fracturing design based on small-sized pressure measurement analysis', fracture parameters under different models are inverted through net pressure fitting, and compared with microseism data, the transformation 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 analysis method for the fracturing effect of a fractured carbonate reservoir, which is used for realizing evaluation analysis on the fracturing effect of the fractured carbonate reservoir and ensuring reliable principle and simple flow, and comprises the following steps:
performing multiple pump stopping tests to obtain multiple pump stopping pressure test values under different injection well liquid amounts and different pump stopping times;
performing multiple pressure drop tests to obtain multiple pressure drop test values of different well injection amounts and the same pump stop time;
obtaining the output of the test well after transformation;
performing evaluation analysis on 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 after the test well is reformed; wherein,,
performing multiple pump stopping tests, equally dividing the liquid amount of the injection well into multiple parts, performing fracturing operation by using each part of liquid amount, and performing the pump stopping tests 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 P istp (V i ) The calculation formula of (2) is as follows:
wherein i=1, 2,3 … …, V 0 =0, h is the depth of the middle of the reservoir of the fracturing operation target layer, V i Is the injection well liquid quantity m when the pump is stopped for the ith time 3 ，P i The bottom hole pressure is the bottom hole pressure when the well injection liquid amount reaches a preset value in the fracturing operation process;
P i ＝P iw +P h
P iw is the wellhead pressure, MPa and P when the ith pump is stopped h Is liquid column pressure and MPa.
Optionally, performing evaluation analysis on the fracture effect of the fractured carbonate reservoir of the construction well by using the pump-down pressure test value, the pressure drop test value and the output after the test well is reformed, including:
acquiring a benchmark 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 output of the test well after transformation, comparing the reference value with the evaluation value, and carrying out evaluation analysis on the fracturing effect of the fractured carbonate reservoir of the construction well according to the comparison result.
Optionally, after obtaining the pump stopping pressure test value, normalizing the pump stopping pressure test value.
Optionally, the normalizing the pump stop pressure test value includes:
carrying out 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 parameters of the pump stopping pressure test value database, and normalizing the pump stopping pressure test value P Istp normalization (V i ) The calculation formula of (2) is as follows:
wherein P is istp To normalize the values before, maxP istp For maximum parameter value in the pump-down pressure test value database, minP istp Is the minimum parameter value in the pump down pressure test value database.
Optionally, the pump-down pressure drop test value P D (V i ,T i ) The calculation formula of (2) is as follows:
wherein i=1, 2,3 … …, V 0 ＝0，V i Is the injection well liquid quantity m when the pump is stopped for the ith time 3 ，P i，t Is the wellhead pressure after the pressure drop at t time after the ith pump stop, P i The bottom hole pressure is the bottom hole pressure when the well injection liquid amount reaches a preset value in the fracturing operation process;
P i ＝P iw +P h
P iw is the wellhead pressure, MPa and P when the ith pump is stopped h Is liquid column pressure and MPa.
Optionally, after obtaining the test value of the drop of the pump stopping pressure, normalizing the test value of the drop of the pump stopping pressure.
Optionally, the normalizing process for the pump-down pressure drop test value includes:
carrying out multiple pressure drop tests on one well, calculating a pump stopping pressure drop test value in each pump stopping period, and forming a pump stopping pressure drop test value database;
according to the pressure drop test value of the pump stopDatabase parameters, calculating a normalized shutdown pressure drop test value and a normalized shutdown pressure drop test value P D normalization (V i ,T i ) The calculation formula of (2) is as follows:
wherein P is D To normalize the values before, maxP D For maximum parameter value in the pump-down pressure test value database, minP D Is the minimum parameter value in the pump down pressure test value database.
Alternatively, evaluation value F index The calculation formula of (2) is as follows:
F index ＝Q×F fracture
wherein Q is stable yield after test well modification, m 3 /d，F fracture The calculation formula of the comprehensive fracturing transformation factor is as follows:
in the method, in the process of the invention,for normalizing the average value of the pump-down pressure test value, +.>For normalizing the average value of the test value of the pressure drop of the pump stop, W 1 Weight coefficient of non-dimensional pump stopping pressure test value, W 2 And the weight coefficient is a dimensionless pump-stopping pressure drop test value.
The embodiment of the invention also provides an evaluation analysis device for the fracture effect of the fractured carbonate reservoir, which is used for realizing evaluation analysis on the fracture effect of the fractured carbonate reservoir, ensuring reliable principle and simple flow, and comprises the following steps:
the pump stopping test module is used for carrying out multiple pump stopping tests and obtaining multiple pump stopping pressure test values under different injection well liquid amounts and different pump stopping times; dividing the liquid amount of the injection well into a plurality of parts, carrying out fracturing operation by utilizing each part of liquid amount, and carrying out 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 P istp (V i ) The calculation formula of (2) is as follows:
wherein i=1, 2,3 … …, V 0 =0, h is the depth of the middle of the reservoir of the fracturing operation target layer, V i Is the injection well liquid quantity m when the pump is stopped for the ith time 3 ，P i The bottom hole pressure is the bottom hole pressure when the well injection liquid amount reaches a preset value in the fracturing operation process;
P i ＝P iw +P h
P iw is the wellhead pressure, MPa and P when the ith pump is stopped h Liquid column pressure, MPa;
the pressure drop test module is used for performing multiple pressure drop tests and obtaining multiple pressure drop test values under the same pump stop time and different well injection liquid amounts;
the yield acquisition module is used for acquiring the yield of the test well after transformation;
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 output of the test well after transformation.
Optionally, the evaluation analysis module is further configured to:
acquiring a benchmark 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 output of the test well after transformation, and performing evaluation analysis on the fracture effect of the fractured carbonate reservoir of the construction well by using the evaluation value.
The embodiment of the invention also provides computer equipment, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes the method when executing the computer program.
Embodiments of the present invention also provide a computer-readable storage medium storing a computer program for executing the above method.
According to the evaluation analysis method for the fracture effect of the fractured carbonate reservoir, provided by the embodiment of the invention, the multiple pump stopping pressure test values and the multiple pressure drop test values are obtained by carrying out multiple pump stopping tests and multiple pressure drop tests in the reservoir fracturing operation, and the evaluation analysis for the fracture effect of the fractured carbonate reservoir can be completed by utilizing the pump stopping pressure test values, the pressure drop test values and the output after the test well is reformed, namely the reforming 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 invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. In the drawings:
FIG. 1 is a schematic flow chart of a method for evaluating and analyzing the fracturing effect of a fractured carbonate reservoir according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an evaluation analysis device for fracture effect of a fractured carbonate reservoir according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings. The exemplary embodiments of the present invention and their descriptions herein are for the purpose of explaining the present invention, but are not to be construed as limiting the invention.
The embodiment of the invention provides an evaluation analysis method for the fracturing effect of a fractured carbonate reservoir, which is shown in a figure 1 and comprises the following steps:
and 101, performing multiple pump stopping tests to obtain multiple pump stopping pressure test values under different injection well liquid amounts and different pump stopping times.
And 102, performing multiple pressure drop tests to obtain multiple pressure drop test values under the same pump stop time and different well injection amounts.
And 103, obtaining the output of the test well after modification.
And 104, performing evaluation analysis on 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 transformation.
According to the evaluation analysis method for the fracture effect of the fractured carbonate reservoir, provided by the embodiment of the invention, the multiple pump stopping pressure test values and the multiple pressure drop test values are obtained by carrying out multiple pump stopping tests and multiple pressure drop tests in the reservoir fracturing operation, and the evaluation analysis for the fracture effect of the fractured carbonate reservoir can be completed by utilizing the pump stopping pressure test values, the pressure drop test values and the output after the test well is reformed, namely the reforming effect of the reservoir is evaluated and analyzed, so that the principle is reliable and the flow is simple.
The well injection liquid can be fracturing liquid, acid liquid and the like. The pump-down pressure test value may also be referred to as a "pump-down pressure composite 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 transformation, carry out accurate evaluation analysis to the fracture effect of fractured carbonate reservoir, utilize stopping pump pressure test value, pressure drop test value and the output after the test well transformation, carry out the evaluation analysis of fracture effect of fractured carbonate reservoir to the construction well, include:
acquiring a benchmark 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 output of the test well after transformation, comparing the reference value with the evaluation value, and carrying out evaluation analysis on the fracturing effect of the fractured carbonate reservoir of the construction well according to the comparison result.
Wherein, the "evaluation value" may also be referred to as "analysis-by-synthesis factor".
For step 101, in order to obtain a plurality of pump stop pressure test values under different conditions to ensure accuracy of obtaining evaluation analysis, performing a plurality of pump stop tests to obtain a plurality of pump stop pressure test values under different pump stop times and different well injection amounts, including:
dividing the liquid amount of the injection well into a plurality of parts, carrying out fracturing operation by utilizing each part of liquid amount, and carrying out 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 P istp (V i ) The calculation formula of (2) is as follows:
wherein i=1, 2,3 … …, V 0 =0, h is the depth of the middle of the reservoir of the fracturing operation target layer, V i Is the injection well liquid quantity m when the pump is stopped for the ith time 3 ，P i The bottom hole pressure is the bottom hole pressure when the well injection liquid amount reaches a preset value in the fracturing operation process;
P i ＝P iw +P h
P iw is the wellhead pressure, MPa and P when the ith pump is stopped h Is liquid column pressure and MPa.
Based on the above, in order to simplify the calculation, the pump-down pressure test value is quickly obtained, and after the pump-down pressure test value is obtained, the pump-down pressure test value is normalized.
Specifically, the normalization processing of the pump-down pressure test value includes:
carrying out 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 parameters of the pump stopping pressure test value database, and normalizing the pump stopping pressure test value P Istp normalization (V i ) The calculation formula of (2) is as follows:
wherein P is istp To normalize the values before, maxP istp For maximum parameter value in the pump-down pressure test value database, minP istp Is the minimum parameter value in the pump down pressure test value database.
For step 102, in order to obtain the pump-down pressure drop test values under a plurality of different conditions, to ensure the accuracy of the evaluation analysis, the pump-down pressure drop test value P is obtained D (V i ,T i ) The calculation formula of (2) is as follows:
wherein i=1, 2,3 … …, V 0 ＝0，V i Is the injection well liquid quantity m when the pump is stopped for the ith time 3 ，P i，t Is the wellhead pressure after the pressure drop at t time after the ith pump stop, P i The bottom hole pressure is the bottom hole pressure when the well injection liquid amount reaches a preset value in the fracturing operation process;
P i ＝P iw +P h
P iw is the wellhead pressure, MPa and P when the ith pump is stopped h Is liquid column pressure and MPa.
At this time, the fracturing modification factor F is synthesized fracture The formula is as follows:
based on the above, in order to simplify the calculation, the pump-down pressure drop test value is rapidly acquired, and after the pump-down pressure drop test value is acquired, the pump-down pressure drop test value is normalized.
Specifically, the normalization processing of the pump-down pressure drop test value includes:
carrying out multiple pressure drop tests on one well, calculating a pump stopping pressure drop test value in each pump stopping period, and forming a pump stopping pressure drop test value database;
calculating a normalized pump-down pressure drop test value according to the parameters of the pump-down pressure drop test value database, and normalizing the pump-down pressure drop test value P D normalization (V i ,T i ) The calculation formula of (2) is as follows:
wherein P is D To normalize the values before, maxP D For maximum parameter value in the pump-down pressure test value database, minP D Is the minimum parameter value in the pump down pressure test value database.
In the embodiment of the invention, the evaluation value F index The calculation formula of (2) is as follows:
F index ＝Q×F fracture
wherein Q is stable yield after test well modification, m 3 /d。
F fracture The calculation formula of the comprehensive fracturing transformation factor is as follows:
in the method, in the process of the invention,for normalizing the average value of the pump-down pressure test value, +.>For normalizing the average value of the test value of the pressure drop of the pump stop, W 1 Weight coefficient of non-dimensional pump stopping pressure test value, W 2 And the weight coefficient is a dimensionless pump-stopping pressure drop test value.
F index The larger the value, the better the reservoir retrofitting effect. By healdAnalysis factor F index Performing real-time comparative analysis on subsequent construction wells, if F is obtained index The method has the advantages that the method is large, the adopted fracturing measure is better, the reservoir transformation effect is improved, and if F is obtained index And the size is reduced, and technological analysis and adjustment of construction parameters are required. By a plurality of F index The database can analyze the transformation effect of the whole block and is further popularized to the reservoir transformation optimization design of basins and reservoirs of the same kind.
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, as described in the following embodiment. Since the principle of the device for evaluating and analyzing the fracture effect of the fractured carbonate reservoir is similar to that of the method for evaluating and analyzing the fracture effect of the fractured carbonate reservoir, the implementation of the device for evaluating and analyzing the fracture effect of the fractured carbonate reservoir can be referred to the implementation of the method for evaluating and analyzing the fracture effect of the fractured carbonate reservoir, and repeated parts are not repeated. As used below, the term "unit" or "module" may be a combination of software and/or hardware that implements the intended function. While the means described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and contemplated.
The embodiment of the invention provides an evaluation analysis device for the fracturing effect of a fractured carbonate reservoir, as shown in fig. 2, the device comprises:
the pump stop test module 201 is configured to perform multiple pump stop tests, and obtain multiple pump stop pressure test values under different pump stop times and different injection well liquid amounts;
the pressure drop test module 202 is configured to perform multiple pressure drop tests, and obtain multiple pressure drop test values under the same pump stop time and different well injection amounts;
the output obtaining module 203 is configured to obtain the output of the test well after modification;
and the evaluation analysis module 204 is used for performing evaluation analysis on the fracture 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 after the test well is reformed.
In one embodiment, the evaluation analysis module 204 is further configured to:
acquiring a benchmark 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 output of the test well after transformation, and performing evaluation analysis on the fracture effect of the fractured carbonate reservoir of the construction well by using the evaluation value.
The embodiment of the invention also provides computer equipment, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes the method when executing the computer program.
Embodiments of the present invention also provide a computer-readable storage medium storing a computer program for executing the above method.
The invention will be described below by taking a modification of a fractured reservoir of carbonate rock as an example:
the well reconstruction parameters are as follows: co-directional well injection 2000m 3 Liquid, construction discharge volume 10m 3 The injected liquid is guar gum, wherein the first 1000m 3 250m of liquid per injection 3 The pump was stopped once, 4 times, 15 minutes each time. The liquid quantity of the injection well reaches 1000m 3 Every 500m 3 The pump was stopped once and 6 times in total. The test results are shown in Table 1.
The pump stopping pressure under different liquid amounts and time is tested by adopting a pump stopping method with different liquid amounts and time for multiple times, and a pump stopping pressure test value P under different liquid amounts and time is obtained istp (V i ). When the construction reaches the set amount, the pump stopping test is carried out, and the test time is generally 15 minutes. Using formula P i ＝P iw +P h (wherein P iw Is the wellhead pressure, MPa and P when the ith pump is stopped h The liquid column pressure, MPa), the bottom hole pressure is calculated each time. Reuse ofAnd calculating a pump stopping pressure test value according to the formula.
TABLE 1
Performing pressure drop test under the above different pump stop conditions, with test results shown in Table 2, to obtain pressure drop test value P with different liquid amounts and same pump stop time D (V i )。
TABLE 2
According to the reservoir characteristics of the block, as shown in Table 3, a weighting coefficient W of a dimensionless pump-down pressure test value is selected 1 Weight coefficient W of dimensionless pump down pressure drop test value =0.4 2 =0.6, and the comprehensive fracture modification factor F was obtained using the formula using the pump down pressure test value obtained in table 1 and the pressure drop test value obtained in table 2 fracture ＝0.246。
TABLE 3 Table 3
And (3) collecting the output of the well after transformation, wherein 75 square/day of daily oil is produced after the well is pressed, 9 square/day of daily gas is produced, and the equivalent of converted oil gas is 165 square/day of daily oil. The calculated evaluation value is 165×0.246=40.59.
Evaluation of yield and post-press effect after transformationValue F index =40.59. The comprehensive analysis factors are utilized to compare the subsequent 3 wells, and the comprehensive factors under different scales, 75.35, 86.5, 35.4 and 87.7 are obtained through analysis. The comparison shows that the construction liquid amount of the first well for subsequent construction is 1800m 3 Construction displacement 14m 3 /min, while the second well has increased liquid consumption to 2500m 3 The construction discharge capacity is increased to 14m 3 The total factor after pressing reaches 86.5 per minute, and the corresponding construction scale of the third well reaches 1500m 3 Construction displacement of 10m 3 Per min, and the construction liquid amount of the fourth well reaches 3000m 3 Construction displacement 14m 3 The overall factor increase was small, indicating that the reasonable size of the block was 2500m 3 Construction displacement 14m 3 The/min is reasonable. And optimizing the construction parameters of the subsequent well by utilizing the conclusion, and guiding the subsequent scheme design of the block well by optimizing the scale.
In conclusion, the quantitative recognition of the fracture evaluation effect of the fractured carbonate reservoir is realized, and the guiding basis is provided for the fracturing scale, the fracturing process and the fracturing material selection according to the magnitude of the obtained evaluation value index of the post-fracturing effect in the whole fracturing design. From the aspect of field test condition and effect analysis, the method is reasonable in concept and remarkable in effect, the difficult problem in the fracturing process of the fractured carbonate reservoir is successfully solved, and the success rate of fracture improvement and the fracturing improvement effect of the fractured carbonate reservoir are improved.
It will be appreciated by those skilled in the art that 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 flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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 foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (11)
1. An evaluation analysis method for the fracturing effect of a fractured carbonate reservoir is characterized by comprising the following steps:
performing multiple pump stopping tests to obtain multiple pump stopping pressure test values under different injection well liquid amounts and different pump stopping times;
performing multiple pressure drop tests to obtain multiple pump stopping pressure drop test values under the same pump stopping time of different well injection amounts;
obtaining the output of the test well after transformation;
performing evaluation analysis on the fracturing effect of the fractured carbonate reservoir of the construction well by using the pump stopping pressure test value, the pump stopping pressure drop test value and the yield of the test well after transformation; wherein,,
performing a plurality of pump stop tests to obtain a plurality of pump stop pressure test values under different injection well liquid amounts and different pump stop times, including:
dividing the liquid amount of the injection well into a plurality of parts, carrying out fracturing operation by utilizing each part of liquid amount, and carrying out 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 P istp (V i ) The calculation formula of (2) is as follows:
wherein i=1, 2,3 … …, V 0 =0, h is the depth of the middle of the reservoir of the fracturing operation target layer, V i Is the injection well liquid quantity m when the pump is stopped for the ith time 3 ，P i The bottom hole pressure is the bottom hole pressure when the well injection liquid amount reaches a preset value in the fracturing operation process;
P i ＝P iw +P h
P iw is the wellhead pressure, MPa and P when the ith pump is stopped h Liquid column pressure, MPa;
test value P of pump stopping pressure drop D (V i ,T i ) The calculation formula of (2) is as follows:
wherein i=1, 2,3 … …, V 0 ＝0，V i Is the injection well liquid quantity m when the pump is stopped for the ith time 3 ，P i，t Is the wellhead pressure after the pressure drop at t time after the ith pump stop, P i The bottom hole pressure is the bottom hole pressure when the well injection liquid amount reaches a preset value in the fracturing operation process;
P i ＝P iw +P h
P iw is the wellhead pressure, MPa and P when the ith pump is stopped h Is liquid column pressure and MPa.
2. The method of claim 1, wherein performing an evaluation analysis of the fracture effect of the fractured carbonate reservoir in the construction well using the pump down pressure test value, the pump down pressure drop test value, and the production after the test well is modified comprises:
acquiring a benchmark value of construction well evaluation;
calculating an evaluation value of the construction well by using the pump stopping pressure test value, the pump stopping pressure drop test value and the output of the test well after transformation, comparing the reference value with the evaluation value, and carrying out evaluation analysis on the fracture effect of the fractured carbonate reservoir of the construction well according to the comparison result.
3. The method of claim 1, wherein the pump down pressure test value is normalized after the pump down pressure test value is obtained.
4. A method according to claim 3, wherein normalizing the pump down pressure test value comprises:
carrying out 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 parameters of the pump stopping pressure test value database, and normalizing the pump stopping pressure test value P Istp normalization (V i ) The calculation formula of (2) is as follows:
wherein P is istp To normalize the values before, maxP istp For maximum parameter value in the pump-down pressure test value database, minP istp Is the minimum parameter value in the pump down pressure test value database.
5. The method of claim 1, wherein the pump down pressure drop test value is normalized after the pump down pressure drop test value is obtained.
6. The method of claim 5, wherein normalizing the pump down pressure drop test value comprises:
carrying out multiple pressure drop tests on one well, calculating a pump stopping pressure drop test value in each pump stopping period, and forming a pump stopping pressure drop test value database;
calculating a normalized pump-down pressure drop test value according to the parameters of the pump-down pressure drop test value database, and normalizing the pump-down pressure drop test value P D normalization (V i ,T i ) The calculation formula of (2) is as follows:
wherein P is D To normalize the values before, maxP D For maximum parameter value in the pump-down pressure test value database, minP D Is the minimum parameter value in the pump down pressure test value database.
7. The method of claim 6, wherein the evaluation value F index The calculation formula of (2) is as follows:
F index ＝Q×F fracture
wherein Q is stable yield after test well modification, m 3 /d，F fracture The calculation formula of the comprehensive fracturing transformation factor is as follows:
in the method, in the process of the invention,for normalizing the average value of the pump-down pressure test value, +.>For normalizing the average value of the test value of the pressure drop of the pump stop, W 1 Weight coefficient of non-dimensional pump stopping pressure test value, W 2 And the weight coefficient is a dimensionless pump-stopping pressure drop test value.
8. An evaluation analysis device of fracture effect of fractured carbonate reservoir, characterized by comprising:
the pump stopping test module is used for carrying out multiple pump stopping tests and obtaining multiple pump stopping pressure test values under different injection well liquid amounts and different pump stopping times; dividing the liquid amount of the injection well into a plurality of parts, carrying out fracturing operation by utilizing each part of liquid amount, and carrying out 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 P istp (V i ) The calculation formula of (2) is as follows:
wherein i=1, 2,3 … …, V 0 =0, h is the depth of the middle of the reservoir of the fracturing operation target layer, V i Is the injection well liquid quantity m when the pump is stopped for the ith time 3 ，P i The bottom hole pressure is the bottom hole pressure when the well injection liquid amount reaches a preset value in the fracturing operation process;
P i ＝P iw +P h
P iw for the ith pump stopWellhead pressure, MPa, P h Liquid column pressure, MPa;
the pressure drop test module is used for performing multiple pressure drop tests to obtain multiple pump stopping pressure drop test values P under the same pump stopping time under different injection well liquid amounts D (V i ,T i ) The calculation formula of (2) is as follows:
wherein i=1, 2,3 … …, V 0 ＝0，V i Is the injection well liquid quantity m when the pump is stopped for the ith time 3 ，P i，t Is the wellhead pressure after the pressure drop at t time after the ith pump stop, P i The bottom hole pressure is the bottom hole pressure when the well injection liquid amount reaches a preset value in the fracturing operation process;
P i ＝P iw +P h
P iw is the wellhead pressure, MPa and P when the ith pump is stopped h Liquid column pressure, MPa;
the yield acquisition module is used for acquiring the yield of the test well after transformation;
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 pump stopping pressure drop test value and the output of the test well after transformation.
9. The apparatus of claim 8, wherein the evaluation analysis module is further to:
acquiring a benchmark value of construction well evaluation;
and calculating an evaluation value of the construction well by using the pump stopping pressure test value, the pump stopping pressure drop test value and the output of the test well after transformation, and performing evaluation analysis on the fracture effect of the fractured carbonate reservoir of the construction well by using the evaluation value.
10. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the method of any of claims 1 to 7 when executing the computer program.
11. 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 7.
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