CN108871411A - Hydraulic seam-cutting pressure relief evaluation method for cross-layer drilling - Google Patents
Hydraulic seam-cutting pressure relief evaluation method for cross-layer drilling Download PDFInfo
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- CN108871411A CN108871411A CN201810679852.6A CN201810679852A CN108871411A CN 108871411 A CN108871411 A CN 108871411A CN 201810679852 A CN201810679852 A CN 201810679852A CN 108871411 A CN108871411 A CN 108871411A
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- slotted liner
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- 238000005553 drilling Methods 0.000 title claims abstract description 56
- 238000005520 cutting process Methods 0.000 title claims abstract description 27
- 238000011156 evaluation Methods 0.000 title claims abstract description 20
- 239000003245 coal Substances 0.000 claims abstract description 76
- 238000000034 method Methods 0.000 claims abstract description 47
- 230000000694 effects Effects 0.000 claims abstract description 21
- 238000011835 investigation Methods 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000007689 inspection Methods 0.000 claims description 16
- 238000010276 construction Methods 0.000 claims description 7
- 238000012360 testing method Methods 0.000 claims description 3
- 238000012795 verification Methods 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims description 2
- 238000003786 synthesis reaction Methods 0.000 claims description 2
- 238000000605 extraction Methods 0.000 abstract description 7
- 208000008918 voyeurism Diseases 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention relates to a cross-layer drilling hydraulic slotting pressure relief evaluation method, which belongs to the field of coal mine gas extraction and comprises the following steps: 1. in the process of cutting the hydraulic slotting of the cross-layer drill holes at equal intervals, counting and measuring the total coal output of the drill holes and the total number of cutters of the slotting; 2. calculating the average single-cutter coal yield according to the drilling coal yield and the slotting cutter number; 3. the width of the cutting slit groove is inspected on site by using a drilling peeping instrument; 4. measuring and calculating the cutting radius according to the coal yield of each cutter, the width of a cutting slot and the density of coal or determining the cutting radius R by adopting a field investigation mode; 5. calculating the expansion deformation rate by using the width of the cutting seam groove, the number of cutting knives and the length of the coal section of the cross-layer drilling hole; 6. and detecting the water content of the coal bed within the cutting radius range. And the evaluation on the hydraulic seam cutting pressure relief effect of the cross-layer drilling is realized according to the expansion deformation rate, the coal yield, the cutting half R and the water content of the coal seam, wherein the water content of the coal seam reaches or exceeds a preset threshold value.
Description
Technical field
The invention belongs to coal mine gas drainage technical field, it is related to a kind of underground coal mine layer-through drilling hydraulic slotted liner technique release and comments
Valence method.
Background technique
Coal accounts for 70% for a long time in China's energy consumption mix, and by the long-term leading energy as China.But China
Mining gas-geology construction is complicated, and coal seam has microscopic voids development, high characterization of adsorption, and the permeability ratio U.S. in coal seam is average low
About 3 orders of magnitude keep coal seam gas-bearing capacity high, and primitive coalbed gas drainage difficulty is big, coal seam pressure relief extraction and coal reservoir fracture
Transformation is the problem of China's coal-mine gas drainage must be taken into consideration, for release extraction mainly by the way of protective layer, for coal
Reservoir fracture transformation mainly draws cave, hydraulic reaming, hydraulic slotted liner technique, hydraulic fracturing, controlled blasting explosion etc. using drilling machine.
High-pressure hydraulic slot is due to it is suitable for high-ground stress, high methane, low air permeability coal seam working face concordant, wearing layer brill
Hole and stone door punching coal release is anti-reflection, prevention and treatment of bump, and significant effect is achieved, it is used widely.
After the measure for taking high-pressure hydraulic slot, effective method is needed to determine slot operation effectiveness.At present for waterpower
The measure of slot region mainly utilizes remaining gas pressure, gas remainder quantity, extraction rate, extraction protrusion-dispelling radius etc. from gas drainage
Effect carries out protrusion-dispelling effect assessment, and does not carry out release effect from stress relieving angle and evaluated, and can not accomplish waterpower
The Real-Time Evaluation of slot effect.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of layer-through drilling waterpower to cut release evaluation method, overcome existing
Deficiency in technology provides from stress relieving angle and carries out release effect evaluation method, realizes the reality of hydraulic slotted liner technique release effect
When evaluate.
In order to achieve the above objectives, the present invention provides the following technical solutions：
Layer-through drilling hydraulic slotted liner technique release evaluation method, includes the following steps：
S1：In the equidistant cutting process of layer-through drilling hydraulic slotted liner technique, the total coal output T of statistical survey drilling and the total knife of slot
Number c；
S2：According to drilling, the total coal output T and total knife number c of slot calculates average hilted broadsword coal output t；
S3：With the width d of inspection instrument for borehole site inspection cutting slot；
S4：Density a according to average hilted broadsword coal output t, cutting slot width d, coal calculates cut radius R or using scene
The mode of investigation carries out cut radius R and determines；
S5：See that coal segment length h calculates dilatancy rate γ using cutting slot width d, the total knife number c of slot, layer-through drilling；
S6：Detect coal seam moisture content ξ within the scope of cut radius；
S7：Tetra- the dilatancy rate γ, average hilted broadsword coal output t, cut radius R, coal seam moisture content ξ investigations are referred to
Mark is compared with preset threshold value respectively, if being more than preset threshold, determines that layer-through drilling hydraulic slotted liner technique release effect has
Effect.
Further, the dilatancy rate γ is obtained using following formula：
γ=d × c/h.
Further, the average hilted broadsword coal output t is calculated using following formula：
T=T/ (t × c).
Further, the cut radius R is obtained using following formula：
Wherein π is pi, and value 3.14, K is the broken expansion factor of generation slack coal after slot, and value 1.1~1.3, r is to apply
Work layer-through drilling radius, a are coal body density.
Further, when the cut radius R is in the way of site inspection, away from hydraulic slotted liner technique drilling different distance punishment
Drilling Shi Gong not be investigated, when there is flowing water phenomenon in investigation hole, as cut radius R.
Further, within the scope of the detection cut radius when moisture content ξ of coal seam, two verification test points are at least arranged, point
Wei Yu it not calculate or the middle part of site inspection cut radius and marginal position.
Further, the threshold value root of the dilatancy rate γ, average hilted broadsword coal output t, cut radius R, coal seam moisture content ξ
It is determined according to parametric synthesis such as the practical coalbed gas geology of construction area, crustal stress, for being able to carry out the region of investigation, using reality
The method of investigation is determined, for being difficult to the region investigated, by dilatancy rate γ, average hilted broadsword coal output t, cut radius
R, moisture content ξ in coal seam carries out threshold value value according to 3 ‰, 0.3t, 1m, 3% respectively.
Beneficial effects of the present invention：It is aqueous by dilatancy rate γ, average hilted broadsword coal output t, cut radius R, coal seam
Tetra- indexs of rate ξ evaluate hydraulic slotted liner technique release effect, and method is easy, and easily operated, strong applicability is realized to coal seam
The Real-Time Evaluation of release effect overcomes the shortcomings that existing coal seam only carries out effect assessment from protrusion-dispelling angle, has and pushes away extensively
Wide applying value.
Detailed description of the invention
In order to keep the purpose of the present invention, technical scheme and beneficial effects clearer, the present invention provides following attached drawing and carries out
Explanation：
Fig. 1 is the flow diagram that layer-through drilling described in the embodiment of the present invention cuts peak release evaluation method；
Fig. 2 is that cut radius described in the embodiment of the present invention investigates drilling arrangement schematic diagram；
Fig. 3 is that moisture content ξ described in the embodiment of the present invention investigates drilling arrangement schematic diagram.
Specific embodiment
Detailed description of the invention：0# drilling is that hydraulic slotted liner technique drills, and 1#~9# drilling is to investigate drilling.
Below in conjunction with attached drawing, a preferred embodiment of the present invention will be described in detail.
As shown in Figure 1, layer-through drilling hydraulic slotted liner technique release effect evaluation method in the present invention.Specific implementation step is as follows：
1. in the equidistant cutting process of layer-through drilling hydraulic slotted liner technique, the total coal output T of statistical survey drilling and the total knife of slot
Number c；
2. calculating average hilted broadsword coal output t according to drilling coal output and slot knife number；
3. utilizing the width d of inspection instrument for borehole site inspection cutting slot；
4. carrying out cut radius R by the way of site inspection to determine；
5. seeing that coal segment length h calculates dilatancy rate γ using cutting slot width d, cutter number c, layer-through drilling；
6. detecting coal seam moisture content ξ within the scope of cut radius
7. by tetra- dilatancy rate γ, coal output t, cut radius R, coal seam moisture content ξ inspection targets respectively with it is default
Threshold value be compared, if be more than preset threshold, determine that layer-through drilling hydraulic slotted liner technique release works well.
In the present embodiment, dilatancy rate γ is obtained using following formula：
γ=d × c/h
In the present embodiment, average hilted broadsword coal output t is calculated using following formula：
T=T/ (t × c)
As shown in Fig. 2, in the present embodiment, cut radius R in the way of site inspection with the following method：Wearing layer
Construction finishes 1~7# investigation drilling before hydraulic slotted liner technique is implemented in drilling, and 1~7# investigates the distance difference that drilling drills away from hydraulic slotted liner technique
For 0.5m, 1m, 1.5m, 2m, 2.5m, 3m, 3.5m；When investigating drilling and showing water phenomenon, as site inspection cut radius
R。
As shown in figure 3, in the present embodiment, detecting coal seam moisture content ξ within the scope of cut radius and with the following method, cutting
It cuts and is respectively arranged 2 verification test points within the scope of radius R, be located at middle part and the marginal position of cut radius.
In the present embodiment, for dilatancy rate γ, coal output t, cut radius R, coal seam moisture content ξ how is arranged
Threshold value can comprehensively consider the parameters such as the coal seam buried depth, coalbed gas geology, crustal stress of construction area and determine, for that can examine
The region examined can be determined using the method actually investigated；It, can be by dilatancy for some regions for being difficult to investigate
Rate γ, coal output t, cut radius R, coal seam moisture content ξ carry out threshold value value according to 3 ‰, 0.3t, 1m, 3% respectively.If four
Index is more than preset threshold, then determines that layer-through drilling hydraulic slotted liner technique release works well, and satisfaction unloads pressure request.
In the present embodiment, using existing from remaining gas pressure, gas remainder quantity, extraction rate, extraction protrusion-dispelling radius
Deng from gas pumping effect carry out protrusion-dispelling effect assessment on the basis of, increase dilatancy rate γ, coal output t, cut radius R,
The evaluation index of coal seam moisture content ξ, to evaluate layer-through drilling hydraulic slotted liner technique release effect, to realize protrusion-dispelling effect and release effect
Fruit overall merit.Not only method is simple, easy to operate, strong applicability, and realizes layer-through drilling hydraulic slotted liner technique release effect
Real-Time Evaluation.
Finally, it is stated that preferred embodiment above is only used to illustrate the technical scheme of the present invention and not to limit it, although logical
It crosses above preferred embodiment the present invention is described in detail, however, those skilled in the art should understand that, can be
Various changes are made to it in form and in details, without departing from claims of the present invention limited range.
Claims (7)
1. layer-through drilling hydraulic slotted liner technique release evaluation method, it is characterised in that：Include the following steps：
S1：In the equidistant cutting process of layer-through drilling hydraulic slotted liner technique, the total coal output T and total knife number c of slot of statistical survey drilling；
S2：According to drilling, the total coal output T and total knife number c of slot calculates average hilted broadsword coal output t；
S3：With the width d of inspection instrument for borehole site inspection cutting slot；
S4：Density a according to average hilted broadsword coal output t, cutting slot width d, coal calculates cut radius R or using site inspection
Mode carry out cut radius R determine；
S5：See that coal segment length h calculates dilatancy rate γ using cutting slot width d, the total knife number c of slot, layer-through drilling；
S6：Detect coal seam moisture content ξ within the scope of cut radius；
S7：By the dilatancy rate γ, average hilted broadsword coal output t, cut radius R, tetra- inspection targets of coal seam moisture content ξ point
It is not compared with preset threshold value, if being more than preset threshold, determines that layer-through drilling hydraulic slotted liner technique release effect is effective.
2. layer-through drilling hydraulic slotted liner technique release evaluation method according to claim 1, layer-through drilling hydraulic slotted liner technique release are commented
Valence method, it is characterised in that：The dilatancy rate γ is obtained using following formula：
γ=d × c/h.
3. layer-through drilling hydraulic slotted liner technique release evaluation method according to claim 1, layer-through drilling hydraulic slotted liner technique release are commented
Valence method, it is characterised in that：The average hilted broadsword coal output t is calculated using following formula：
T=T/ (t × c).
4. according to claim 1, layer-through drilling hydraulic slotted liner technique release evaluation method, it is characterised in that：The cutting half
Diameter R is obtained using following formula：
Wherein π is pi, and value 3.14, K is the broken expansion factor of generation slack coal after slot, and value 1.1~1.3, r is that construction is worn
Layer boring radius, a are coal body density.
5. layer-through drilling hydraulic slotted liner technique release evaluation method according to claim 1, layer-through drilling hydraulic slotted liner technique release are commented
Valence method, it is characterised in that：When the cut radius R is in the way of site inspection, away from hydraulic slotted liner technique drilling different distance
Drilling is investigated in construction respectively at place, when there is flowing water phenomenon in investigation hole, as cut radius R.
6. according to claim 1, layer-through drilling hydraulic slotted liner technique release evaluation method, it is characterised in that：The detection is cut
When cutting moisture content ξ in coal seam in radius, two verification test points are at least arranged, be located at measuring and calculating or site inspection cutting half
The middle part of diameter and marginal position.
7. layer-through drilling hydraulic slotted liner technique release evaluation method according to claim 1, layer-through drilling hydraulic slotted liner technique release are commented
Valence method, it is characterised in that：The threshold of the dilatancy rate γ, average hilted broadsword coal output t, cut radius R, coal seam moisture content ξ
It is worth the parametric synthesis such as the practical coalbed gas geology according to construction area, crustal stress to determine, for being able to carry out the region of investigation, uses
The method actually investigated is determined, for being difficult to the region investigated, by dilatancy rate γ, average hilted broadsword coal output t, cutting
Radius R, coal seam moisture content ξ carry out threshold value value according to 3 ‰, 0.3t, 1m, 3% respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810679852.6A CN108871411A (en) | 2018-06-27 | 2018-06-27 | Hydraulic seam-cutting pressure relief evaluation method for cross-layer drilling |
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| CN201810679852.6A CN108871411A (en) | 2018-06-27 | 2018-06-27 | Hydraulic seam-cutting pressure relief evaluation method for cross-layer drilling |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113033008A (en) * | 2021-03-31 | 2021-06-25 | 中煤科工集团重庆研究院有限公司 | Method for evaluating uniform pressure relief effect of horizontal joint cutting of bedding drilling |
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| CN113033008A (en) * | 2021-03-31 | 2021-06-25 | 中煤科工集团重庆研究院有限公司 | Method for evaluating uniform pressure relief effect of horizontal joint cutting of bedding drilling |
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| WO2022205622A1 (en) * | 2021-03-31 | 2022-10-06 | 中煤科工集团重庆研究院有限公司 | Method for evaluating effect of uniform pressure relief by horizontal slitting in hole drilled along coal seam |
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