Synergetic fracturing method for main crack and complex crack network of large channel

A technology of main fractures and large channels, which is applied in the field of oil and gas field development and research, can solve the problems of suppressing formation oil and gas production, wasting diversion capacity, and small diversion capacity, so as to enhance reservoir fluid flow capacity, improve reliability and success rate , the effect of enhancing oil and gas recovery

Active Publication Date: 2017-11-24
PEKING UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0008] (2) For a fracture network with a certain geological condition and a certain degree of complexity, what is the large channel main fracture that needs to match the conductivity? If the flow conductivity of the main fractures

Method used

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  • Synergetic fracturing method for main crack and complex crack network of large channel
  • Synergetic fracturing method for main crack and complex crack network of large channel
  • Synergetic fracturing method for main crack and complex crack network of large channel

Examples

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Effect test

Embodiment 1

[0081] The application of "rural road network + expressway" model fracturing technology in vertical wellbore, that is, a method of coordinated fracturing of large channel main fractures and complex fracture network, includes the following steps:

[0082] (1) Fractures forming a complex fracture network:

[0083] Prepare pre-fluid for diversion fracturing, and pump it into the formation under the pumping pressure higher than the fracture pressure of the reservoir: fractures forming complex fracture network; if attached figure 1 shown in the original fracture of the diverted fracturing;

[0084] In the step (1), the prefluid used for steering fracturing is clear water fracturing fluid, slick water or live linear glue fracturing; the particle size of the proppant is 80 / 100 mesh;

[0085] Add proppant to the pad to form a mixed pad, pump it into the fractures of the complex fracture network, the sand ratio is 4%, and the sand ratio is the ratio of the total volume of proppant to ...

Embodiment 2

[0111] As described in Example 1, a method for synergistic fracturing of large-channel main fractures and complex fracture networks, the difference is that the method is applied to the "rural road network + expressway" mode fracturing technology in the wellbore of a horizontal well. The point is that,

[0112] The construction well in the step (1) is a horizontal well, as attached image 3 shown;

[0113] In the step (10), repeat the steps (7) to (9) 3 times to form 3 main fractures with large channels to maximize the fluid flow capacity of the reservoir and improve oil and gas recovery, as shown in the attached Figure 4 shown.

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Abstract

The invention provides a synergetic fracturing method for a main crack and a complex crack network of a large channel. The synergetic fracturing method for the main crack and the complex crack network of the large channel is a novel fracturing technique which is in a country road network and highway mode and is applied to the field of oil-gas field development. According to the synergetic fracturing method for the main crack and the complex crack network of the large channel, the channel fracturing technique and the deflection fracturing technique are combined organically, and an implementation method is provided; the synergetic fracturing method is suitable for various conventional and unconventional reservoirs such as high-permeability sandstone, shale, tight sandstone and coal rock, volume transformation of vertical wells and horizontal wells within a wider range is achieved, the flowing ability of fluid in the reservoirs is enhanced, the effective stimulation period is prolonged, and the rate of oil-gas recovery is increased; and meanwhile, the construction cost can be reduced to a larger extent, and the synergetic fracturing method has a positive guiding effect on development of oil and gas resources.

Description

technical field [0001] The invention relates to a method for cooperative fracturing of large-channel main fractures and complex fracture networks, and belongs to the technical field of oil and gas field development and research. Background technique [0002] With the increasing difficulty in the development of middle-aged and old oilfields, and the acceleration of the exploration and development of unconventional reservoirs such as shale gas reservoirs, coalbed methane reservoirs, and tight sandstone oil and gas reservoirs, channel fracturing technologies, such as Chinese patent ZL201310279118.8 and diversion fracturing As two emerging fracturing technologies, fracturing technology has gradually been promoted and applied in construction sites. [0003] Channel fracturing technology adopts special fiber fracturing fluid and unique pumping procedure, and adopts the method of pulse sanding to form discontinuous proppant clusters in the formation, so as to realize propped fractu...

Claims

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Application Information

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IPC IPC(8): E21B43/267
CPCE21B43/006E21B43/267
Inventor 温庆志张东晓牟绍艳
Owner PEKING UNIV
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