Fracturing technology using propping agent density variation for obtaining large channels

A technology of density difference and proppant, which is applied in the direction of drilling composition, production fluid, wellbore/well components, etc., can solve the problems affecting the effect of fracturing, high closure pressure, limited support capacity, etc., and achieve improved stability properties, increase viscosity, and reduce sedimentation velocity

Active Publication Date: 2015-06-24
RES INST OF PETROLEUM ENG SHENGLI OIL FIELD SINOPEC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is difficult to implement on site, because the non-uniformity of proppant laying is difficult to control, and artificial fractures are likely to be closed due to lack of proppant filling in a large area, which affects the fracturing effect; moreover, due to the high closure pressure of the formation, The support capacity of the pier-type "pillar" is limited, causing the fracture to be continuously closed under the action of the formation stress, which may easily lead to compaction and deformation of the proppant "pillar", thereby greatly reducing the fracture conductivity

Method used

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  • Fracturing technology using propping agent density variation for obtaining large channels
  • Fracturing technology using propping agent density variation for obtaining large channels
  • Fracturing technology using propping agent density variation for obtaining large channels

Examples

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Effect test

Embodiment 1

[0045] A fracturing process for realizing large channels by using difference in proppant density, comprising the following steps:

[0046] (1) Mix the low-density proppant and the high-density proppant with the fracturing fluid base fluid respectively to obtain the low-density proppant fracturing fluid and the high-density proppant fracturing fluid, and the low-density proppant fracturing fluid The sand ratio of the proppant and high-density proppant fracturing fluid is 15%, and the density of the low-density proppant is 1g / cm 3 , hollow particles; the density of the high-density proppant is 2.5g / cm 3 ;

[0047] (2) Mix medium-density proppant, fiber and fracturing fluid base fluid evenly to obtain fiber-containing medium-density proppant fracturing fluid; the sand ratio of the medium-density proppant fracturing fluid is 12%, and the The medium density proppant has a density of 1.2g / cm 3 , the quality of fiber added in every cubic meter of proppant is 2kg;

[0048] (3) At ...

Embodiment 2

[0053] A fracturing process for realizing large channels by using difference in proppant density, comprising the following steps:

[0054] (1) Mix the low-density proppant and the high-density proppant with the fracturing fluid base fluid respectively to obtain the low-density proppant fracturing fluid and the high-density proppant fracturing fluid, and the low-density proppant fracturing fluid The sand ratio of the proppant and high-density proppant fracturing fluid is 15%, and the density of the low-density proppant is 1.1g / cm 3 , hollow particles; the density of the high-density proppant is 3.0g / cm 3 ;

[0055] (2) Mix medium-density proppant, fiber and fracturing fluid base fluid evenly to obtain fiber-containing medium-density proppant fracturing fluid; the sand ratio of the medium-density proppant fracturing fluid is 12%, and the The medium density proppant has a density of 1.5g / cm 3 , the mass of fibers added to each cubic meter of proppant is 3.5kg;

[0056] (3) At...

Embodiment 3

[0059] A fracturing process for realizing large channels by using difference in proppant density, comprising the following steps:

[0060] (1) Mix the low-density proppant and the high-density proppant with the fracturing fluid base fluid respectively to obtain the low-density proppant fracturing fluid and the high-density proppant fracturing fluid, and the low-density proppant fracturing fluid The sand ratio of the proppant and high-density proppant fracturing fluid is 15%, and the density of the low-density proppant is 1.0g / cm 3 , hollow particles; the density of the high-density proppant is 2.8g / cm 3 ;

[0061] (2) Mix medium-density proppant, fiber and fracturing fluid base fluid evenly to obtain fiber-containing medium-density proppant fracturing fluid; the sand ratio of the medium-density proppant fracturing fluid is 12%, and the The medium density proppant has a density of 1.3g / cm 3 , the quality of fibers added to each cubic meter of proppant is 1.5kg;

[0062] (3)...

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Abstract

The invention relates to a fracturing technology using propping agent density variation for obtaining large channels. The fracturing technology includes the following steps that propping agent fracturing fluid low in density, intermediate in density and high in density is prepared, and fibers are added into the propping agent fracturing fluid intermediate in density to form propping agent clusters serving as the premise of channel fracturing; at the beginning of fracturing, prepad fluid is pumped into the stratum so that the stratum can form a crack of a certain width and a certain length, and the propping agent fracturing fluid of the three densities is together pumped into the stratum; because no fibers are added into low-density propping agent particles and high-density propping agent particles, the low-density propping agent particles and the high-density propping agent particles can freely float and precipitate at the top and the upper portion of the crack; the propping agent fracturing fluid intermediate in density is injected in a pulse mode, and the channels of a certain size can be formed between the propping agent clusters. The large channels of larger sizes are formed between an intermediate-density propping agent zone and a low-density propping agent zone as well as between the intermediate-density propping agent zone and a high-density propping agent zone.

Description

technical field [0001] The invention relates to a fracturing process for realizing large passages by applying proppant density differences, and belongs to the technical field of oil and gas field development. Background technique [0002] my country's unconventional oil and gas reservoirs, such as coalbed methane, shale oil and gas, and tight sandstone oil and gas, are widely distributed, have huge reserves, and have great development potential. However, due to the low permeability and difficulty in mining, the early development efforts were not strong. At present, with the increase in energy demand worldwide and the development of high-permeability oil and gas fields coming to an end, unconventional oil and gas reservoirs have gradually become the main body of energy development. However, due to their low porosity and low permeability, oil and gas in the reservoir The resistance during seepage is extremely high, so general unconventional reservoirs have low production or e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/267C09K8/80
CPCC09K8/80E21B43/267
Inventor 黄波温庆志任占春王淑婷李明张燎源王峰段晓飞
Owner RES INST OF PETROLEUM ENG SHENGLI OIL FIELD SINOPEC
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