Volume transformation process of low permeability reservoir

A technology of volume reformation and reservoir, applied in the field of volume reformation of low permeability reservoirs, can solve the problems of easy generation of bifurcation fractures, low fracturing production, poor permeability, etc., to improve the overall permeability, increase production and final The effect of recovery

Active Publication Date: 2013-02-06
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in traditional hydraulic fracturing, when the net pressure of fracture extension is greater than the sum of the difference between the two horizontal principal stresses and the tensile strength of the rock, bifurcated fractures are likely to occur, and multiple bifurcated fractures will form a "fracture network" system. The main fracture is the backbone of the "fracture network" system, and the bifurcated fracture

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: A volume reconstruction process of a low-permeability reservoir of the present invention comprises the following steps in sequence,

[0019] (1) Select coal seam, shale or tight sandstone or other low-permeability reservoirs;

[0020] (2) After the vertical wells are perforated, the hydraulic fracturing method of ball-throwing and flow-limiting is adopted; the horizontal wells are subjected to the multi-cluster perforation hydraulic fracturing method after the perforation, the length of each cluster is 0.5-0.8 m, and the distance between clusters is 20-40 m , with a pore density of 16-20 pores / m; these two fracturing methods require variable displacement, variable proppant, variable fracturing fluid, and variable sand ratio during the pumping process.

[0021] Hydraulic fracturing uses active water or slick water as the fracturing fluid. The proppant first uses nut shell or ultra-low density ceramsite. The proppant particle size is 70-100 mesh, 60-80 mesh,...

Embodiment 2

[0024] Embodiment 2: The difference from Embodiment 1 is that in the hydraulic fracturing in step (2), guar gum or clean fracturing fluid is used as the fracturing fluid, and when the reservoir temperature is lower than 30°C, liquid nitrogen or Self-generated nitrogen and chlorine dioxide are used as auxiliary materials; natural quartz sand or ceramsite is selected as proppant, and the particle size is 70-100 mesh, 60-80 mesh, 20-40 mesh and 16-20 mesh; construction displacement is based on low-permeability storage Depending on the type of layer, the active water is injected by a variable displacement pump, with a displacement of 0~15 m 3 / min; guar gum or clean fracturing fluid shall be constructed with constant displacement, and the displacement shall not be less than 5 m 3 / min; the pumping procedure of fracturing fluid is chlorine dioxide → active water → authigenic nitrogen or liquid nitrogen → active water → chlorine dioxide → active water → guar gum or clean fracturing ...

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Abstract

The invention discloses a volume transformation process of a low permeability reservoir, and the volume transformation process sequentially comprises the following steps of (1) selecting a coal bed, shale, tight sand or other low-permeability reservoir; and (2) adopting a pitching current-limiting hydraulic fracturing way after perforating a plumb shaft; adopting a segmental multi-cluster perforation hydraulic fracturing way after perforating a horizontal well; and varying displacement, propping agent, fracturing fluid and sand ratio in the pumping process in both fracturing ways. Due to adopting the measures for varying the displacement, the sand ratio, the propping agent and the fracturing fluid in the hydraulic fracturing process, pitching current limitation can be adopted when the plumb shaft is fractured or the segmental multi-cluster perforation fracturing process is adopted for the horizontal well, and a netted crack system is formed in the reservoir. Due to adopting the volume transformation process, the volume transformation effect is realized, the weakness of the traditional hydraulic fracturing process that a single crank cannot conform to the commercial production capacity or the later yield is reduced too fast can be avoided, and technical support can be provided for the oil-gas resource development of the low-permeability reservoir.

Description

technical field [0001] The invention belongs to the technical field of oil and gas exploitation and production, and in particular relates to a volume reconstruction process of low-permeability reservoirs. Background technique [0002] Low-permeability reservoirs such as coal seams, shale and tight sandstone contain abundant unconventional oil and gas resources, and reservoir stimulation technology is the key to realizing commercial production. However, in traditional hydraulic fracturing, when the net pressure of fracture extension is greater than the sum of the difference between the two horizontal principal stresses and the tensile strength of the rock, bifurcated fractures are likely to occur, and multiple bifurcated fractures will form a "fracture network" system. The main fracture is the backbone of the "fracture network" system, and the bifurcated fractures may return to the original fracture orientation after extending a certain distance from the main fracture, and fi...

Claims

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Application Information

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IPC IPC(8): E21B43/26E21B43/267
Inventor 苏现波郭红玉蔺海晓倪小明刘晓韩颖张双斌宋金星夏大平林晓英
Owner HENAN POLYTECHNIC UNIV
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