Oil and gas reservoir well testing interpretation model and method based on karst cave point source equivalence principle
A technology of equivalent principle and well test interpretation, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as inability to establish seepage models, difficult modeling, incomplete application, etc.
A technology of equivalent principle and well test interpretation, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as inability to establish seepage models, difficult modeling, incomplete application, etc.
CN110362931AActive Publication Date: 2019-10-22SOUTHWEST PETROLEUM UNIV +1
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[0236] The target well is an exploratory well in a certain block of Northwest Oilfield. Drilling was started on March 27, 2010, and there was no venting, leakage or overflow during the drilling process. Drilling was completed on March 6, 2011, the depth of the well was 7110m, and the layer O2yj was completed.
[0237] On March 22, 2011, acid fracturing was carried out on the 6950-7110m well section of the Ordovician Jianfang Formation (O2yj), with a displacement of 2.6-6.5m 3 / min, injection wellbore 897m 3 , squeezed into the formation 897m 3 . As of 9:00 on March 24, the oil nozzle 3mm discharges liquid, and the liquid discharge is 4.1m 3 / h, gas production 11085m 3 / d, gas-oil ratio 114m 3 / m 3 , does not contain water, and the accumulated liquid is 189.5m 3 , of which oil is 123.4m 3 . From April 8th to April 14th, the well was shut down for pressure measurement, the test layer O2yj, and the test well section was 6950-7110m. The highest daily oil production was ...
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The invention discloses an oil and gas reservoir well testing interpretation model and an oil and gas reservoir well testing interpretation method based on a karst cave point source equivalence principle. The method comprises the following steps of S1, establishing a karst cave point source equivalent radial oil and gas reservoir well testing physical model; S2, establishing a mathematical model of seepage of the production well in the double-medium stratum and solving the mathematical model; S3, establishing a mathematical model that the karst cave is equivalent to the injection well; S4, conducting simultaneous solving operation on the equivalent injection well and production well mathematical model, and drawing a well bottom pressure and pressure derivative double logarithmic typical well testing curve; and S5, fitting the typical well testing curve of the well bottom pressure and the pressure derivative with the actually measured well bottom pressure and pressure derivative curve,and explaining stratum parameters. According to the method, a karst cave point source equivalent radial well testing model is established for a radial oil and gas reservoir with large karst caves in discrete distribution, continuously-developed natural micro-cracks and corrosion dissolved holes in the oil and gas reservoir are regarded as double continuous media. The large karst caves are equivalent to discrete distribution variable-strength point sources, and the radial oil and gas reservoir karst cave point source equivalent radial well testing model is established.
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technical field [0001] The invention relates to the technical field of geological exploration, in particular to an oil and gas reservoir well test interpretation model and method based on the equivalent principle of karst cave point sources. Background technique [0002] Carbonate reservoirs have unbalanced development of fractures and caves, strong heterogeneity, complex types of reservoirs, and diverse storage spaces. According to different types of reservoirs, it can be divided into four types: fracture type, fracture-dissolved pore type, fracture-dissolved cave type and dissolved pore-fracture-dissolved cave type reservoir. Fracture-cavity reservoirs in which fractures and caves develop simultaneously are an important type of reservoirs. Fracture-cavity reservoirs represented by the Tahe Oilfield in the Tarim Basin in my country account for more than 30% of the total carbonate reservoirs. , and is also an important branch field for increasing reserves and production of c...
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Patent Timeline
22 Oct 2019
Publication
CN110362931A
- IPC
- G06F17/50
- CPC
- G06F30/20
- Inventors
- 刘建仪; 刘治彬