CN117829005A - Method for evaluating accuracy of results of fracture-following hole-finding fracturing simulation - Google Patents
Method for evaluating accuracy of results of fracture-following hole-finding fracturing simulation Download PDFInfo
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- CN117829005A CN117829005A CN202211184846.6A CN202211184846A CN117829005A CN 117829005 A CN117829005 A CN 117829005A CN 202211184846 A CN202211184846 A CN 202211184846A CN 117829005 A CN117829005 A CN 117829005A
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- 238000004088 simulation Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000010276 construction Methods 0.000 claims abstract description 55
- 238000012360 testing method Methods 0.000 claims abstract description 5
- 239000012530 fluid Substances 0.000 claims description 18
- 239000011435 rock Substances 0.000 claims description 8
- 239000004576 sand Substances 0.000 claims description 8
- 238000004891 communication Methods 0.000 claims description 5
- 238000011156 evaluation Methods 0.000 abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 4
- 238000010521 absorption reaction Methods 0.000 abstract description 3
- 238000009530 blood pressure measurement Methods 0.000 abstract 1
- 238000002347 injection Methods 0.000 abstract 1
- 239000007924 injection Substances 0.000 abstract 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 6
- 238000011161 development Methods 0.000 description 4
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 238000011158 quantitative evaluation Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
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- G06F30/28—Design optimisation, verification or simulation using fluid dynamics, e.g. using Navier-Stokes equations or computational fluid dynamics [CFD]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
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Abstract
The invention provides a method for evaluating the accuracy of a result of a circulating seam hole finding fracturing simulation, and relates to the technical field of yield improvement; performing fracturing construction by locating holes along the seam; water injection pressure measurement is carried out, and whether fracturing is effective or not is judged according to the water absorption index; testing the bottom hole flow pressure, and judging whether the bottom hole flow pressure indication fracturing is effective or not; and (3) oil testing, namely comparing the wellhead flow preset value with the wellhead flow construction value, and when the following conditions are met, indicating that the accuracy of the fracturing numerical simulation result of the tracking and hole finding is high: and the wellhead flow indicates that the fracturing is effective, and the wellhead oil pressure indicates that the fracturing is effective. According to the method for evaluating the accuracy of the fracturing simulation results of the circulating seam hole finding, provided by the invention, the accuracy of the fracturing numerical simulation evaluation results of the circulating seam hole finding is improved by comparing wellhead oil pressure and wellhead flow before and after the fracturing construction of the circulating seam hole finding.
Description
Technical Field
The invention relates to the technical field of oil and gas field development, in particular to a method for evaluating accuracy of a result of a hole finding fracturing simulation by means of seam tracking.
Background
Some carbonate reservoirs in China develop a large number of natural cracks and karst cave, and the key point for developing the reservoirs is how to efficiently communicate with the cracks and the cave. The acid fracturing process of tracking and finding holes is generally adopted for the fracture holes of the far well, and the most effective communication method for the fracture holes of the near well is the acidification process of tracking and finding holes. Before formal construction, numerical simulation is generally required to be performed to optimize construction parameters, so that the maximization of the seam-hole communication coefficient is ensured.
Chinese patent application number CN201810306321.2 discloses a method for numerical simulation of horizontal well fracturing near wellbore fracture distortion morphology, which may include: establishing a multi-layer heterogeneous stratum model according to stratum parameters and construction parameters; establishing a fluid-solid coupling numerical equation according to a fluid seepage equation, a rock deformation equation, a fracture distortion criterion and a fracture surface fluid flow equation; and carrying out extended finite element numerical simulation in the multi-layer heterogeneous stratum model according to the fluid-solid coupling numerical equation, and determining the distortion form of the horizontal well near-wellbore fracture at each moment.
Chinese patent application number CN201210116977.0 discloses a method and apparatus for full-length three-dimensional fracturing numerical simulation for hydrocarbon reservoir development, which may include: acquiring prestack seismic data of a hydrocarbon reservoir development target area; elastic parameter inversion is carried out by adopting the pre-stack seismic data, and an elastic parameter data body of the oil and gas reservoir development target area is obtained; constructing a rock mechanical parameter model based on three-dimensional grid nodes according to the elastic parameter data body; calculating stress information on the three-dimensional grid nodes to generate a three-dimensional stress field distribution model; and carrying out three-dimensional numerical simulation of the full fracture length of the fracture in the fracturing process according to the rock mechanical parameter model and the three-dimensional stress field distribution model. The existing method for evaluating the accuracy of the fracturing numerical simulation results is mainly characterized in that the water absorption profiles before and after the fracturing construction are directly compared, namely the method is a qualitative evaluation method,
at present, the method for evaluating the accuracy of the fracturing numerical simulation results is mainly a qualitative evaluation method by directly comparing the water absorption sections before and after fracturing construction, but for fracture-cavity type carbonate rock, the evaluation method is too simple and cannot well represent the accuracy of the fracturing numerical simulation results of finding holes along the fracture.
Therefore, a brand new numerical simulation evaluation method is required to be provided for the fracture-cavity type carbonate reservoir fracture-following hole finding, and the evaluation is improved from qualitative evaluation to quantitative evaluation.
Disclosure of Invention
Based on the problems, the invention discloses a method for evaluating the accuracy of a result of a hole finding fracturing simulation by means of seam tracking.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the invention provides a method for evaluating accuracy of a result of a hole finding fracturing simulation by a circulating seam, which comprises the following specific steps:
step one, carrying out fracturing numerical simulation of tracking and hole finding to obtain a wellhead oil pressure preset value and a wellhead flow preset value before fracturing construction;
step two, performing fracturing construction of locating holes by circulating the joints, and obtaining a wellhead oil pressure construction value and a wellhead flow construction value after the fracturing construction is completed;
step three, testing oil, comparing the wellhead flow preset value with the wellhead flow construction value, and judging whether the bottom hole flow pressure indication fracturing is effective or not;
measuring pressure, comparing the wellhead oil pressure preset value with the wellhead oil pressure construction value, and judging whether wellhead oil pressure indication fracturing is effective or not;
fifthly, when the following conditions are met, the accuracy of the fracturing numerical simulation result of the tracking and hole finding is high: and the wellhead flow indicates that the fracturing is effective, and the wellhead oil pressure indicates that the fracturing is effective.
Preferably, the fracturing method of the tracking and hole finding is as follows:
fracturing the rock hydraulically to form main cracks and opening natural cracks; the formed main seam and the opened natural seam communicate with the karst cave.
Preferably, fracture numerical simulation of the frac-finding is used to optimize fracture construction parameters, where the parameters involved include, but are not limited to: the type of fracturing fluid, the dosage of the pad fluid, the dosage of the sand carrying fluid, the dosage of the displacing fluid, the sand ratio and the construction discharge capacity.
Preferably, if the wellhead flow construction value/wellhead flow preset value is more than or equal to 1.1, judging that the wellhead flow indication fracturing is effective.
Preferably, if the wellhead oil pressure construction value/wellhead oil pressure preset value is more than or equal to 1.2, judging that wellhead oil pressure indication fracturing is effective.
Compared with the prior art, the invention has the following advantages:
the invention provides a method for evaluating the accuracy of a fracturing simulation result of a circulating seam hole finding, which improves the accuracy of the fracturing numerical simulation evaluation result of the circulating seam hole finding greatly by comparing wellhead flow and wellhead oil pressure before and after the fracturing construction of the circulating seam hole finding from the previous qualitative evaluation to the quantitative evaluation. Can be applied to fracture-cavity type carbonate rock fracturing simulation and has wide application prospect.
Drawings
FIG. 1 is a schematic flow chart of a method for evaluating accuracy of a result of a hole finding fracturing simulation of a circulating seam;
FIG. 2 is a schematic diagram of a simulated fracture-cavity communication situation in the method for evaluating the accuracy of the results of the fracture simulation of the cyclic fracture-finding hole;
FIG. 3 is a comparison of wellhead flow before and after fracture construction of a fracture-following hole-finding in a method for evaluating accuracy of results of fracture simulation of the fracture-following hole-finding;
FIG. 4 is a comparison of wellhead oil pressures before and after fracture construction of a fracture-following hole-finding fracturing in the method for evaluating the accuracy of the results of the fracture-following hole-finding fracturing simulation.
Detailed Description
In order to make the purpose and technical solution of the embodiments of the present invention more clear, the technical solution of the present invention will be clearly and completely described below in connection with the embodiments of the present invention.
Example 1
As shown in FIG. 1, the invention provides a method for evaluating the accuracy of a result of a hole-finding fracturing simulation by means of a seam, which comprises the following specific steps:
step one, carrying out fracturing numerical simulation of tracking and hole finding to obtain a wellhead oil pressure preset value and a wellhead flow preset value before fracturing construction; the specific operation of the fracturing numerical simulation is as follows: collecting geological parameters of a target reservoir; simulating crack propagation in the fracture-cavity reservoir by adopting a finite element expansion method; and optimizing construction parameters by taking the communication seam hole as a principle: the type of fracturing fluid, the dosage of the pad fluid, the dosage of the sand carrying fluid, the dosage of the displacing fluid, the sand ratio and the construction discharge capacity.
Step two, performing fracturing construction of locating holes by circulating the joints, and obtaining a wellhead oil pressure construction value and a wellhead flow construction value after the fracturing construction is completed; the fracturing method for locating holes by the following steps: fracturing the rock hydraulically to form main cracks and opening natural cracks; the formed main seam and the opened natural seam communicate with the karst cave. In the fracturing process, the main seam encounters a natural seam when the main seam extends, the natural seam is opened, the natural seam also extends together, and in the process of the cooperative extension of the main seam/the natural seam, a karst cave is encountered, namely the main seam and the opened natural seam communicate with the karst cave.
Step three, testing oil, comparing the wellhead flow preset value with the wellhead flow construction value, and judging whether the bottom hole flow pressure indication fracturing is effective or not; if the wellhead flow construction value/wellhead flow preset value is more than or equal to 1.1, judging that wellhead flow indication fracturing is effective, otherwise judging that wellhead flow indication fracturing is ineffective;
measuring pressure, comparing the wellhead oil pressure preset value with the wellhead oil pressure construction value, and judging whether wellhead oil pressure indication fracturing is effective or not; if the wellhead oil pressure construction value/wellhead oil pressure preset value is more than or equal to 1.2, judging that wellhead oil pressure indication fracturing is effective; otherwise, judging that the wellhead oil pressure indicates that fracturing is invalid;
fifthly, when the following conditions are met, the accuracy of the fracturing numerical simulation result of the tracking and hole finding is high: and the wellhead flow indicates that the fracturing is effective, and the wellhead oil pressure indicates that the fracturing is effective.
Example two
Taking an actual deep fracture-cavity type carbonate reservoir as an example, the above procedure is described.
The target reservoir is a deep fracture-cavity type carbonate reservoir, the distribution of natural fractures and karst cavities is shown in figure 1, and the fracture numerical simulation result of the fracture-following and hole-finding is also shown in figure 1. The wellhead flow before and after the fracturing construction of the circulating seam and the hole finding is shown in figure 2, and the wellhead oil pressure before and after the fracturing construction of the circulating seam and the hole finding is shown in figure 3.
The average wellhead flow before the fracturing construction of the circulating seam and the hole is 9.9m3/d, and the average wellhead flow after the fracturing construction of the circulating seam and the hole is 13.3m3/d, so the ratio of the two is 1.34, and the wellhead flow is satisfied to indicate that the fracturing is effective.
The average wellhead oil pressure before the fracturing construction of the circulating seam and the hole is 2.8MPa, and the average wellhead oil pressure after the fracturing construction of the circulating seam and the hole is 5.1MPa, so the ratio of the two is 1.82, and the condition that the wellhead oil pressure indicates that the fracturing is effective is satisfied.
Because the wellhead flow indication fracturing is effective and the wellhead oil pressure indication fracturing is effective, the method has the advantages that the fracturing construction of the circulating seam and the hole finding is effective, namely the fracturing numerical simulation result of the circulating seam and the hole finding is accurate.
The foregoing is a description of embodiments of the invention, which are specific and detailed, but are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention.
Claims (6)
1. A method for evaluating accuracy of a result of a hole finding fracturing simulation of a circulating seam is characterized by comprising the following steps:
the method comprises the following specific steps:
optimizing construction parameters, performing fracturing numerical simulation of tracking and hole finding, and obtaining a wellhead oil pressure preset value and a wellhead flow preset value before fracturing construction;
step two, carrying out fracturing construction of locating holes by circulating the joints according to the construction parameters in the step one, and obtaining a wellhead oil pressure construction value and a wellhead flow construction value after the fracturing construction is completed;
step four, testing oil, comparing the wellhead flow preset value with the wellhead flow construction value, and judging whether the bottom hole flow pressure indication fracturing is effective or not;
measuring pressure, comparing the wellhead oil pressure preset value with the wellhead oil pressure construction value, and judging whether wellhead oil pressure indication fracturing is effective or not;
step six, when the following conditions are satisfied, the accuracy of the fracturing numerical simulation result of the tracking and hole finding is high: and the wellhead flow indicates that the fracturing is effective, and the wellhead oil pressure indicates that the fracturing is effective.
2. The method for evaluating the accuracy of the results of the hole-finding fracturing simulation by the aid of the circulation method, disclosed in claim 1, is characterized in that:
the specific operation of the fracturing numerical simulation is as follows: collecting geological parameters of a target reservoir; simulating crack propagation in the fracture-cavity reservoir by adopting a finite element expansion method; and optimizing construction parameters by taking the communication seam hole as a principle: the type of fracturing fluid, the dosage of the pad fluid, the dosage of the sand carrying fluid, the dosage of the displacing fluid, the sand ratio and the construction discharge capacity.
3. The method for evaluating the accuracy of the results of the hole-finding fracturing simulation by the aid of the circulation method, disclosed in claim 1, is characterized in that:
the fracturing method for locating holes by the following steps:
fracturing the rock hydraulically to form main cracks and opening natural cracks; the formed main seam and the opened natural seam communicate with the karst cave.
4. The method for evaluating the accuracy of the results of the hole-finding fracturing simulation by the aid of the circulation method, disclosed in claim 1, is characterized in that:
fracture numerical simulation of hole finding along the seam is used to optimize fracture construction parameters, where the parameters involved include, but are not limited to: the type of fracturing fluid, the dosage of the pad fluid, the dosage of the sand carrying fluid, the dosage of the displacing fluid, the sand ratio and the construction discharge capacity.
5. The method for evaluating the accuracy of the results of the hole-finding fracturing simulation by the aid of the circulation method, disclosed in claim 1, is characterized in that:
and if the wellhead flow construction value/wellhead flow preset value is more than or equal to 1.1, judging that the wellhead flow indication fracturing is effective.
6. The method for evaluating the accuracy of the results of the hole-finding fracturing simulation by the aid of the circulation method, disclosed in claim 1, is characterized in that:
and if the wellhead oil pressure construction value/wellhead oil pressure preset value is more than or equal to 1.2, judging that wellhead oil pressure indication fracturing is effective.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211184846.6A CN117829005A (en) | 2022-09-27 | 2022-09-27 | Method for evaluating accuracy of results of fracture-following hole-finding fracturing simulation |
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| CN202211184846.6A CN117829005A (en) | 2022-09-27 | 2022-09-27 | Method for evaluating accuracy of results of fracture-following hole-finding fracturing simulation |
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