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Fracturing process for development and application of low permeability heterogeneous sandstone oil and gas reservoir

A technology for heterogeneous oil and gas formations, applied in the field of fracturing technology, can solve problems such as inability to achieve efficient development, failure to meet reservoir stimulation, and unsatisfactory effects, so as to improve the effect of fracturing stimulation, improve formation seepage field, and improve The effect of formation seepage capacity

Active Publication Date: 2020-02-14
DAGANG OIL FIELD GRP +1
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Problems solved by technology

[0003] Applying the existing fracturing technology to transform low-permeability heterogeneous sandstone oil and gas reservoirs has a small sweeping range, rapid production decline after fracturing, and unsatisfactory results, which cannot meet the needs of reservoir stimulation and cannot achieve efficient development

Method used

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  • Fracturing process for development and application of low permeability heterogeneous sandstone oil and gas reservoir

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Embodiment 1

[0025] Example 1: Well A in the tidal sea area, the fracturing section is 4362.4m-4470.3m, and the well deviation is 63.2 0 . The span of the fracturing target layer is 107.9m, the perforated well section has 7 layers of 55.7m, and the logging interpretation permeability is 2.45×10 -3 μm 2 -23.63×10 -3 μm 2 , the effective permeability of well test interpretation is 1.1×10 -3 μm 2 , indicating that the formation has poor permeability. Optimizing the fracturing process design and implementing a total liquid volume of 4247m 3 , total sand volume 262m 3 , construction displacement 7m 3 / min. Among them, low-viscosity slick water accounts for 85%, 70 / 140 quartz sand accounts for 31%, and the remaining proppant is preferably ceramsite combined with 40 / 70 mesh and 30 / 50m mesh. Seawater-based slick water and seawater-based low-viscosity fracturing fluid are used for fracturing fluid, all of which are continuously mixed on site. The well implementation effect is remarkable....

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Abstract

The invention belongs to the field of oil field development, and particularly relates to a fracturing process for the development and application of a low permeability heterogeneous sandstone oil andgas reservoir. The fracturing process for the development and application of the low permeability heterogeneous sandstone oil and gas reservoir includes the following steps that (1), a slickwater leak-off and energization stage is carried out, specifically, slickwater and quartz sand or ceramsite are pumped into a reservoir to form micro-cracks to improve the seepage ability of a stratum; and (2),a main fracture stage of long cracks formed by fracturing fluid is carried out, specifically, the low viscosity fracturing fluid and the ceramsite are pumped into the stratum to form the long crackswith high conductivity, and the long cracks communicate the micro-cracks in the step (1) to establish a near-wellbore high seepage zone and reduce the seepage pressure. According to the fracturing process for the development and application of the low permeability heterogeneous sandstone oil and gas reservoir, a process method of slickwater leak-off energization+high conductivity main cracks formed by the fracturing fluid+large displacement is adopted. Compared with the prior art of using frozen-gel fracturing, the swept volume of the cracks is greatly increased, and the problems of poor connectivity of the heterogeneous sandstone reservoir and poor seepage capacity are solved; the stratum energy is replenished; and the long cracks with high flow conductivity are established, the stratum seepage field is improved, and the fracturing modification effect is improved.

Description

technical field [0001] The invention belongs to the field of oil field development, and in particular relates to a fracturing process for the development and application of low-permeability heterogeneous sandstone oil and gas layers. Background technique [0002] Low-permeability heterogeneous sandstone oil and gas reservoirs have poor reservoir physical properties, poor connectivity, low production, and cannot be produced normally. Reservoir reconstruction must be carried out to achieve effective development and improve economic benefits. [0003] Applying existing fracturing technology to transform low-permeability heterogeneous sandstone oil and gas reservoirs has a small sweep range, rapid production decline after fracturing, and unsatisfactory results. It cannot meet the needs of reservoir stimulation and cannot achieve efficient development. Contents of the invention [0004] The purpose of the present invention is to provide a fracturing technology for the developme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/267
CPCE21B43/267
Inventor 田福春陈紫薇赵玉东贾云鹏刘学伟李晓娟隋向云
Owner DAGANG OIL FIELD GRP
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