Volume fracturing directional well arranging method for ultra-low permeability dense reservoir

Abstract

The invention discloses a volume fracturing directional well arranging method for an ultra-low permeability dense reservoir. By adoption of the well arranging method, the large-scale volume fracturing capability can be achieved, the initial per-well production is greatly increased, and the proportion of oil-water wells is high. The modes of reservoir engineering, numerical simulation, downhole microseismic monitoring, mine field statistics and the like are comprehensively utilized during well pattern optimization, characteristics and transform technologies of different reservoir stratums are fully considered, and fractured flooding is avoided; and meanwhile, the requirement for energy replenishing for long-term stable production and water injection is met, and accordingly the purposes of increasing the per-well production and exploitation benefits of the ultra-low permeability dense reservoir are achieved. The volume fracturing directional well arranging method is suitable for complex geological conditions such as longitudinal reservoir stratum superimposed development and large planar structure variation amplitude of the ultra-low permeability dense reservoir, reasonable, and capable of improving the exploiting effect to the maximum extent.

Description

[0001] 【Technical field】 [0002] The invention belongs to the field of oilfield development, and relates to a well layout method for volume fracturing directional wells in tight oil reservoirs with ultra-low permeability. [0003] 【Background technique】 [0004] As the quality of produced oil reservoirs deteriorates year by year, ultra-low permeability tight oil reservoirs have gradually become one of the important successor areas for domestic oilfield development to increase and stabilize production. In order to increase the single well production of this type of oil reservoirs, engineering and technical experts A lot of work has been done, and breakthroughs have been made in reservoir stimulation technology. Directional well fracturing technology has developed from development fracturing to multi-stage multi-fracture fracturing and volume fracturing. Horizontal well fracturing technology has changed from conventional staged fracturing to volume fracturing. At present, horizo...

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Problems solved by technology

The volumetric fracturing development of directional wells is still in the experimental stage. The test well pattern is still developed by using the traditional five-point well pattern, reverse seven-point well pattern and diamond-shaped reverse nine-point well pattern. From the perspective of the development test effect, the overall improvement The effect of stabilizing production after the production of a single well is poor. Generally, the production of a single well drops rapidly after 6 to 8 months of stable production; Statistics show that in the volume fracturing directional well area, the diamond-shaped reverse nine-point well pattern is easy to see water in the main direction well

Because the cost of directional well volume fracturing is higher than that of conventional fracturing, the proportion of oil-water wells is low and the production stability effect is poor when using the traditional directional well layout method. Advantages of Downhole Volume Fracturing

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