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Propping agent for mining and fracturing of coal bed methane and preparation method thereof

A proppant and fracturing technology, which is applied in the direction of mining fluid, earthwork drilling, wellbore/well parts, etc., can solve the problems of high price and less use of ceramsite sand, and achieve obvious fracturing effect, low cost, and relative good capacitive effect

Active Publication Date: 2013-04-24
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used proppants in the fracturing process of coalbed methane mining are quartz sand and ceramsite sand. Due to the high price of ceramsite sand, the use of ceramsite sand is seldom

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1, the preparation of proppant

[0014] Firstly, after the coal gangue is crushed, the particle size distribution and sorting are carried out, and the coal gangue with a particle size of 0.4mm-1.2mm is screened. The plastic index IP25, the CBR (strength)%>45, and the compressive strength / MPa>10, flexural strength / MPa>2. Then take the coal gangue screened out and mix it with water to obtain a mixture, wherein the amount of water added has just covered the upper surface of the gangue; the mixture obtained above is fully stirred, and the time for the mixture to stand still is 24 hours , then the mixture is stratified to obtain the upper layer, middle layer and lower layer, wherein the upper layer is clear water, which can be used as circulating water; the middle layer is mud-water mixture, that is, silt, which can be used as mud retaining wall; the lower layer is mainly sandstone, which is the proppant.

Embodiment 2

[0015] Embodiment 2, the preparation of proppant

[0016] Firstly, after the coal gangue is crushed, the particle size distribution and sorting are carried out, and the coal gangue with a particle size of 0.4mm-1.2mm is screened. The plastic index IP25, the CBR (strength)%>45, and the compressive strength / MPa>10, flexural strength / MPa>2. Then take the above-mentioned screened coal gangue and mix it with water to obtain a mixture, wherein the amount of water added has just covered the upper surface of the coal gangue; fully stir the above-mentioned obtained mixture, and then leave the mixture for 36 hours; The mixture is layered to obtain the upper layer, middle layer and lower layer. The upper layer is clear water, which can be used as circulating water; the middle layer is mud-water mixture, silt, which can be used as mud retaining wall; the lower layer is mainly sandstone, which is proppant.

Embodiment 3

[0017] Embodiment 3, the preparation of proppant

[0018] Firstly, after the coal gangue is crushed, the particle size distribution and sorting are carried out, and the coal gangue with a particle size of 0.4mm-1.2mm is screened. The plastic index IP25, the CBR (strength)%>45, and the compressive strength / MPa>10, flexural strength / MPa>2; then take the coal gangue screened out above and mix it with water to obtain a mixture, wherein the amount of water added has just covered the upper surface of the coal gangue; fully carry out the mixture obtained above Stir, and then leave the mixture to stand for 48 hours, then the mixture is stratified to obtain the upper, middle and lower layers, wherein the upper layer is clear water, which can be used as circulating water; the middle layer is a mud-water mixture, i.e. silt, which can be used as a mud retaining wall; The lower layer is mainly sandstone which is the proppant.

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Abstract

The invention discloses a propping agent for mining and fracturing of coal bed methane and a preparation method thereof. The preparation method comprises the following steps: mixing coal gangue and water to obtain a mixture; stirring and standing the mixture, so that the mixture is layered into an upper layer substance, a middle layer substance and a lower layer substance; and obtaining the lowerlayer substance serving as the propping agent. On one hand, the pollution of an external substance to a coal reservoir can be avoided and the propping agent has long benefits for later mining and sorting of each layer; and on the other hand, the coal gangue of which the particle size of 0.4 to 1.2mm has high strength and has an obvious fracturing effect when being matched with conventional fracturing fluid to be used. Moreover, the coal gangue can be obtained from low resources, and thus, the cost is low, the propping agent is convenient to transport and can be processed in situ.

Description

technical field [0001] The invention relates to a proppant for mining and fracturing of coal bed gas and a preparation method thereof. Background technique [0002] In the mining of coalbed methane, proppant is a kind of solid particle used to support the cracks after the formation is opened in the process of coalbed methane mining, so that the cracks will not be reclosed. It makes the coalbed gas or fluid have a higher flow rate in the supported fractures , reduce the flow resistance of coal bed gas, and achieve the purpose of increasing production and increasing efficiency. At present, the commonly used proppants in the fracturing process of coalbed methane exploitation are quartz sand and ceramsite sand, and ceramsite sand is rarely used because of its high price. Both quartz sand and ceramsite sand belong to coal seam additions, and the intrusion of additions in the process of coalbed methane mining is likely to pollute the coal seam and cause damage to the formation. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/80
Inventor 柳迎红王建丰肖钢陈桂华
Owner CHINA NAT OFFSHORE OIL CORP