A fully supported fracturing method for fractured reservoirs

A fracturing and reservoir technology, which is applied in earth-moving drilling, wellbore/well components, and production fluids, etc., can solve problems such as the inability to successfully complete the construction, the limited volume of fracture stimulation, and restrict the degree of reservoir production, and achieve important economic benefits. Economic and social benefits, the effect of increasing the fracturing stimulation volume, and improving the fracturing stimulation effect

Active Publication Date: 2021-07-30
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] There are a large number of natural fractures in fractured reservoirs, which are easy to open during the fracturing process. After the natural fractures are opened, the fracturing fluid fluid loss is serious, and the liquid efficiency is greatly reduced. During the fracturing operation, sand plugging is prone to occur in the stage of high sand ratio prevent the construction from being completed
Conventional fracturing uses filter reduction and plugging as a means. By optimizing the design and construction parameters, the success rate of fractured reservoir construction is improved. However, the sanding intensity per meter of fracturing is low, and the volume of fracture stimulation is limited, which restricts the degree of reservoir production.

Method used

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  • A fully supported fracturing method for fractured reservoirs
  • A fully supported fracturing method for fractured reservoirs
  • A fully supported fracturing method for fractured reservoirs

Examples

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Embodiment 1

[0027] A fully supported fracturing method for fractured reservoirs, aimed at the downhole of Lao 2 Inclined-2-11 3 3 Construction design liquid volume 332.4m 3 , design displacement 2.5-3.5m 3 / min, the specific fracturing process includes the following steps:

[0028] 1) For the fracturing pre-fluid stage, 2.5m 3 Gel and 0.25% base fluid are injected alternately, first the gel is pumped with small particle size proppant according to 8% sand ratio, and then 0.25% base fluid is used to carry small particle size proppant according to 5% sand ratio The proppant is pumped according to the jelly and 0.25% base fluid respectively carrying 8% and 5% small particle size proppant to carry out three slugs, and then the prefluid supporting natural fracture process is completed;

[0029] 2) In the sand-carrying fluid stage of fracturing, use 3.5m of jelly 3 / min displacement starts from 10% sand ratio to carry medium-sized proppant, and then gradually increases 2% sand ratio to carr...

Embodiment 2

[0041] A fully supported fracturing method for fractured reservoirs, aimed at the old 2-2-9 underground well 1 3 Construction design liquid volume 249.6m3 , design displacement 2.5-3.5m 3 / min, using the fracturing fluid system described in Example 1, the specific fracturing process includes the following steps as shown in Table 3:

[0042] Table 3 Pumping program of the old 2-2-9 well

[0043]

[0044]

[0045] The well depth of this example is 2428.2m, the temperature is 97°C; the viscosity of the prepared jelly is 200mpa.s, and the viscosity of the base fluid is 15mpa.s.

[0046] After adopting the full support fracturing technology described in this embodiment, the daily production increase increases from 0.5t to 4.2t.

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Abstract

The invention discloses a fully supported fracturing method for fractured reservoirs. According to the characteristics of fractured reservoirs, it is proposed for the first time to transform the fracturing process for the purpose of conventional plugging and fluid loss reduction into a fracturing design idea using natural fractures Firstly configure low and high viscosity fracturing fluid systems that meet the needs of oil wells, and combine small, medium and large proppants with different particle sizes at different stages of fracturing, using two viscosities of hydroxypropyl guar gum fluid and three A combination of proppant with different particle sizes can be used to fill main fractures and micro-fractures of different scales to realize the full propping process of multi-scale fractures in different stages of fracturing. The fracturing technology with the goal of effectively stimulating the volume is successful and suitable for popularization and application.

Description

technical field [0001] The invention belongs to the technical field of exploration and development of oil and gas field measure improvement, and in particular relates to a fully supported fracturing method for a fractured reservoir. Background technique [0002] There are a large number of natural fractures in fractured reservoirs, and the natural fractures are easy to open during the fracturing process. After the natural fractures are opened, the fluid loss of the fracturing fluid is serious, and the liquid efficiency is greatly reduced. During the fracturing operation, sand plugging is prone to occur in the stage of high sand ratio prevent the construction from being completed successfully. Conventional fracturing uses filter reduction and plugging as a means. By optimizing the design and construction parameters, the success rate of fractured reservoir construction is improved. However, the sand addition per meter of fracturing is low, and the volume of fracture stimulatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/267
CPCE21B43/267
Inventor 罗文波陈金菊徐峰牟莎莎杨溢
Owner CHINA PETROLEUM & CHEM CORP
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