Design method for azimuthal angle of trajectory of commingled producing well of coal measure production group by considering transitional zones

A design method and transition zone technology, applied in wellbore/well components, production fluid, earthwork drilling and production, etc., can solve problems such as inability to perform accurate simulation, and achieve the effect of saving raw materials, high efficiency, and simple operation

Active Publication Date: 2018-09-11
CHINA UNITED COALBED METHANE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the direction and size of the weak plane cannot be accurately controlled by using oatmeal and shredded paper, it is impossible to accurately simulate the orthogonal weak planes existing in the coal seam, that is, end cleats and face cleats

Method used

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  • Design method for azimuthal angle of trajectory of commingled producing well of coal measure production group by considering transitional zones
  • Design method for azimuthal angle of trajectory of commingled producing well of coal measure production group by considering transitional zones

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Effect test

Embodiment 1

[0043] Such as Figure 1-2 As shown, according to an embodiment of the design method of the azimuth angle of the production well trajectory of the coal-measure production layer combination considering the transition zone of the present invention, it comprises the following steps in order:

[0044] Step 1: Statistically analyze the wellbore structure of the simulated block, determine the inclination angle range of the directional well in the block; process the simulated wellbore 1 with a certain inclination angle 13;

[0045] Step 2: Place the sample mold on the horizontal plane, and open a round hole in the center of the bottom surface of the sample mold; take the line passing through the hole and perpendicular to the bottom surface of the sample mold as the reference line, and simulate the wellbore according to a certain azimuth. 1, the wellbore head is placed downwards in the round hole;

[0046] Step 3: mix cement and quartz sand evenly according to a certain ratio, add wa...

Embodiment 2

[0064] According to another embodiment of the preparation method of the fracturing model sample of the coal-measure production layer group considering the transition zone of the present invention, its specific steps, preparation principle, beneficial effect, etc. are all the same as the first embodiment, the difference is:

[0065] The particle size of described quartz sand is 120 orders;

[0066] In Step 1, the simulated wellbore has an outer diameter of 20 mm and an inner diameter of 15 mm. The length of the vertical section is 40mm, the length of the directional section is 150mm, and the inclination angle is 30°.

[0067] In step 2, the azimuth angle is 60º.

[0068] In step 3, the mass of water added to the cement slurry is 25% of the total mass of cement and quartz sand. The pouring height of the cement slurry in the sample mold is 50 mm.

[0069] In step 4, the volume ratios of cement, quartz sand and coal powder in the ten parts of coal-containing slurry are 1:1:0.15...

Embodiment 3

[0073] According to another embodiment of the preparation method of the fracturing model sample of the coal-measure production layer group considering the transition zone of the present invention, its specific steps, preparation principle, beneficial effect, etc. are all the same as the first embodiment, the difference is:

[0074] The particle size of described quartz sand is 100 orders;

[0075] In step 1, the outer diameter of the simulated wellbore is 18 mm, and the inner diameter is 13 mm. The length of the vertical section is 60 mm, the length of the directional section is 110 mm, and the inclination angle is 60°.

[0076] In step 2, the azimuth angle is 45°.

[0077] In step 3, the mass of water added to the cement slurry is 20% of the total mass of cement and quartz sand. The pouring height of the cement slurry in the sample mold is 80 mm.

[0078] In step 4, the volume ratios of cement, quartz sand, and coal powder in ten parts of coal-containing slurry are 1:1:0.1...

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Abstract

The invention relates to a design method for an azimuthal angle of the trajectory of a commingled producing well of a coal measure production group by considering transitional zones. The method comprises the following steps: taking a line as a datum line, wherein the line is formed in the way that a circular hole penetrating through the bottom center of a sample die is vertical to the bottom surface of the sample die, and downwardly disposing a shaft head into the circular hole according to a certain azimuthal angle of a simulated shaft; mixing cement and silica sand according to the proportion, adding water and stirring to form cement slurries and pouring the cement slurries into the bottom layer of the sample die; mixing cement, silica sand and coal dust according to the proportion, adding water and stirring to form coal-containing slurries, preparing at least ten coal-containing slurries containing different proportions of coal dust and orderly pouring coal dust into a middle layerof the sample die according to the proportions of coal dust in an ascending manner; proportionally mixing cement, silica sand and coal dust, adding water and stirring to form coal-containing slurriesand pouring the coal-containing slurries into a top layer of the sample die; and determining a best azimuthal angle according to crack initiation positions and shapes, wherein the crack initiation positions are generated when the simulated shaft has cracks through hydraulic fracturing at different azimuthal angles. The design method is easy to operate and time and labor-saving.

Description

technical field [0001] The invention belongs to the technical field of oil and gas reservoir development, and in particular relates to a method for designing the azimuth angle of the production wellbore trajectory of coal-measure production-layer combinations in consideration of the transition zone. Background technique [0002] Natural gas resources in coal-bearing production formations are the main components of unconventional natural gas. The rock types and natural gas occurrence states in coal-measure reservoirs are diverse, and multiple sets of source-reservoir-cap combinations result in the coexistence of multiple sets of fluid pressure systems, with obvious interbeds and strong gyrations, thus forming a multi-sequence superposition state in the vertical direction . Production practice shows that the important reason for limiting the natural gas production capacity of coal-measure reservoirs is the interlayer interference in the artificial fractures formed in the late...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B47/00
CPCE21B43/26E21B47/00
Inventor 孟尚志杨刚侯冰郭小锋吴翔郭晖张红杰张林强
Owner CHINA UNITED COALBED METHANE
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