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Coal and rock directional well sand fracturing physical simulation method

A technology of sand fracturing and physical simulation, which is applied in earth-moving drilling, wellbore/well components, and production fluids, etc. It can solve problems such as inaccurate simulation results, achieve high accuracy, reduce errors, and fully expand fractures. Effect

Active Publication Date: 2016-06-01
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technical scheme is a fracturing physical simulation experiment of a vertical coal-rock well. No sand is added to the fracturing fluid, and the coal rock is in direct contact with the cladding layer, which will cause the coal rock to expand when encountering the water in the cladding layer, thus making the coal rock expand. Simulation results are inaccurate

Method used

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  • Coal and rock directional well sand fracturing physical simulation method
  • Coal and rock directional well sand fracturing physical simulation method
  • Coal and rock directional well sand fracturing physical simulation method

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0056] Such as figure 1 Shown, according to an embodiment of the physical simulation method of the coal rock directional well sanding fracturing of the present invention, it comprises the following steps in sequence:

[0057] Step 1: Analyze the weak plane development characteristics of the coal rock in the stratum to be simulated, select coal rock materials according to the analysis results, and process the coal rock materials into coal rock blocks;

[0058] Step 2: Prepare a directional well simulation wellbore according to the inclination angle of the directional well borehole in the simulated formation;

[0059] Step 3: Use the water-resisting layer to cover the coal-rock block, and at the same time select the wrapping layer to pour the coal-rock block covered with the water-resisting layer externally to form a coal-rock fracturing model test piece;

[0060] Step 4: After the cladding layer is consolidated, drill a directional well simulated borehole on the coal-rock frac...

Embodiment 2

[0077] According to another embodiment of the physical simulation method of sanding and fracturing in coal rock directional wells of the present invention, its process flow, principle and beneficial effects are all the same as those in Embodiment 1, the difference is: the outer surface of the directional well simulated wellbore The diameter is 16mm, the inner diameter is 10mm; the length of the simulated shaft of the auxiliary vertical section is 15mm; the thickness of the cladding layer is 70mm, and the side length of the finally obtained coal rock fracturing model specimen is 440mm; The diameter of the simulated wellbore is 19 mm, and an open hole section with a length of 50 mm is reserved at the lower end. The center of the open hole section is located at the center of the coal rock fracturing model test piece; the length of the horizontal groove is 50 mm and the depth is 19 mm. ; Use AB silica gel to cement the simulated wellbore of the directional well in the simulated bor...

Embodiment 3

[0079] According to another embodiment of the physical simulation method of sanding and fracturing in coal rock directional wells of the present invention, its process flow, principle and beneficial effects are all the same as those in Embodiment 1, the difference is: the outer surface of the directional well simulated wellbore diameter is 17mm, internal diameter is 11mm; the length of the simulated wellbore of the described auxiliary vertical section is 20mm; the thickness of the cladding layer is 60mm, and the side length of the finally obtained coal rock fracturing model specimen is 420mm; The diameter of the simulated wellbore is 20 mm, and an open hole section with a length of 40 mm is reserved at the lower end. The center of the open hole section is located at the center of the coal rock fracturing model test piece; the length of the horizontal groove is 50 mm and the depth is 20 mm. ; Use AB silica gel to cement the simulated wellbore of the directional well in the simul...

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Abstract

The invention relates to a coal and rock directional well sand fracturing physical simulation method, which comprises the following steps of selecting coal and rock materials according to the weak face development features of the coal and rock in a simulated stratum, and processing the coal and rock materials into coal and rock block bodies; preparing a wellbore hole simulator of a directional well according to the well deviation angle of a borehole of the directional well of the simulated stratum; covering the coal and rock block bodies with a water-resisting layer, and meanwhile, performing outside pouring on the coal and rock block bodies covered by the water-resisting layer by selecting a covering layer, thus forming a coal and rock fracturing physical model test specimen; drilling a simulated borehole and a horizontal groove of the directional well in the coal and rock fracturing physical model test specimen, and fixedly bonding the wellbore hole simulator of the directional well into the simulated borehole and the horizontal groove of the directional well; preparing fracturing fluid containing supporting agents, and filling the wellbore hole simulator of the directional well with the fracturing fluid; performing simulation experiments on the coal and rock fracturing physical model test specimen by using a true triaxial hydraulic fracturing system; and observing the steering expansion form of the hydraulic fracture in a position near the pit shaft and the conveying distribution features of the supporting agents. The physical simulation method provided by the invention has the advantages that the operation is simple; the accuracy is high; and the physical simulation method conforms to the actual hydraulic fracturing condition.

Description

technical field [0001] The invention belongs to the technical field of coal rock gas reservoir development, and in particular relates to a physical simulation method for sand fracturing in coal rock directional wells. Background technique [0002] my country's coal-rock gas reservoirs are rich in resources, widely distributed, and have great mining potential. Coal rocks are characterized by low porosity and low permeability. To efficiently develop such unconventional coal-rock gas reservoirs, large-scale hydraulic fracturing technology is required to obtain industrial gas flow. In order to increase the gas draining area of ​​coal-rock gas reservoirs and reduce gas migration resistance, directional well fracturing is usually used to improve the recovery rate of coal-rock gas and obtain higher economic output. [0003] In the process of directional well fracturing, the diversion and expansion of near-wellbore fractures and the migration and distribution characteristics of pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/267E21B49/00
CPCE21B43/267E21B49/00
Inventor 侯冰谭鹏金衍陈勉卢运虎林伯韬熊振宇郭小锋
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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