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Method for facture of coal bed methane reservoir of high-level coal

A coalbed methane and reservoir compression technology, applied in the direction of earthwork drilling, mining fluid, wellbore/well components, etc., can solve the problems of large differences between wells, inability to effectively increase coalbed methane production, and poor fracturing effects, and achieve The effect of single well production increase

Active Publication Date: 2014-12-24
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Improves the problem of poor fracturing effect and inability to effectively increase coalbed methane production in existing hydraulic fracturing technology, and is suitable for coalbed methane mining
This invention improves the production of coalbed methane wells, but it cannot accurately control the height of hydraulic fractures, and there are also large differences between wells in improving gas production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: Taking three vertical wells in a formation as an example to carry out the fracturing construction process of high-rank coal-bed methane reservoir fracturing, the present invention will be further described. Proceed as follows:

[0020] (1) There are three vertical wells A, B, and C in a certain area, and the three vertical wells A, B, and C have the same coal seam, and the depth of the well is about 613 meters, and the thickness of the coal seam is 5.4 meters. The three vertical wells A, B and C are distributed in a triangle, with well spacings of 300 meters, 280 meters and 350 meters respectively. Use SDP44RDX40 perforating bullets in the range of 1 meter in the middle of the coal seam to concentrate perforation at 16 holes / m. The perforation depth reaches 1 meter. Communicate with each other to form a large step-down area.

[0021] (2) After the perforation is completed, the three wells implement fracturing construction at the same time, so as to redis...

Embodiment 2

[0027] Embodiment 2: the steps are as follows:

[0028] (1) In a certain area, in the same coal seam, with a well depth of about 647 meters, a coal seam thickness of 5.8 meters, and two vertical wells A and B with a distance of 316 meters adjacent to each other, use SDP44RDX40 perforating bullets within the range of about 1.2 meters in the middle of the coal seam to press 16 Concentrated perforation per hole, the perforation depth reaches 1 meter, and the perforation direction is perpendicular to the minimum principal stress direction of the coal seam, so that the crack extension communicates with the original cleats and fissures of the coal seam, forming a large pressure-reducing area.

[0029] (2) After the perforation is completed, the two wells are fractured at the same time, so that the stress in the fractured area is redistributed, so that more fractures are formed and the wells are connected to each other.

[0030] (3) During the fracturing process, the fracturing fluid...

Embodiment 3

[0034] Embodiment 3: the steps are as follows:

[0035] (1) In the same area, in the same coal seam, with a well depth of about 586 meters, a coal seam thickness of 4.8 meters, a quadrilateral well pattern, and a well spacing of 307 meters, 300 meters, 284 meters, and 338 meters, four wells A, B, C, and D are adjacent to each other For vertical wells, use SDP44RDX40 perforating bullets in the range of 0.9 meters in the middle of the coal seam to concentrate perforation at a rate of 16 holes / m. The perforation depth reaches 1.2 meters. , The cracks communicate with each other to form a large pressure-reducing area.

[0036] (2) After the perforation is completed, the four wells are fractured at the same time to redistribute the stress in the fractured area so as to form more fractures and connect the wells with each other.

[0037] (3) During the fracturing process, the fracturing fluid is prepared from water and anti-swelling agent. The anti-swelling agent is a commonly used ...

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PUM

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Abstract

The invention discloses a method for facture of a coal bed methane reservoir of high-level coal, which is applied to the technical field of development of coal bed methane of the high-level coal, and is characterized in that a facture crack cluster is upwards controlled and transversely crossly extended through centralized perforation of a big pore at the middle of a coal bed, whole sand feeding, synchronous facture of multiple wells, and construction at variable displacement and large liquid amount, so that the efficiency for facture modification of a straight well is improved, the modification range is expanded, a larger pressure drop area is formed in the coal bed, and gas output per well of the coal bed gas well is improved. The method has the effects that: the facture crack cluster is upwards controlled and transversely crossly extended through centralized perforation of the big pore at the middle of the coal bed, whole sand feeding, synchronous facture of multiple wells, and construction at variable displacement and large liquid amount, so that the efficiency for facture modification of the straight well is improved, the modification range is expanded, the larger pressure drop area is formed in the coal bed, and gas output per well of the coal bed gas well is improved.

Description

technical field [0001] The invention relates to the technical field of high-rank coal-bed methane development, in particular to a method for fracturing high-rank coal-bed methane reservoirs. Background technique [0002] At present, my country's coalbed methane reservoirs are characterized by low porosity and low permeability, and the permeability is usually 0.001×10 -3 μm 2 --0.1×10 -3 μm 2 , the natural production capacity is low, and fracturing is often required to obtain industrial production and realize economical mining. Hydraulic fracturing technology is a conventional means of oil field development. It uses the performance of liquid to transmit pressure, and uses high-pressure pumps on the ground to inject liquid into the well with a displacement that greatly exceeds the absorption capacity of the formation. When the pressure is greater than the in-situ stress near the borehole wall and the tensile strength of the reservoir rock, fractures will form in the format...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/267
Inventor 田炜陈洪明梅永贵秦利锋毛生发郭军峰
Owner PETROCHINA CO LTD