CN110242254A - A kind of coal bed methane exploring method - Google Patents
A kind of coal bed methane exploring method Download PDFInfo
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- CN110242254A CN110242254A CN201810971547.4A CN201810971547A CN110242254A CN 110242254 A CN110242254 A CN 110242254A CN 201810971547 A CN201810971547 A CN 201810971547A CN 110242254 A CN110242254 A CN 110242254A
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- coal bed
- reservoir
- screen casing
- bed methane
- horizontal well
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 72
- 239000003245 coal Substances 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 36
- 230000001681 protective effect Effects 0.000 claims description 7
- 239000011152 fibreglass Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 4
- 230000035699 permeability Effects 0.000 abstract description 3
- 230000002195 synergetic effect Effects 0.000 abstract description 2
- 239000004698 Polyethylene Substances 0.000 description 4
- 239000004800 polyvinyl chloride Substances 0.000 description 4
- 229920000915 polyvinyl chloride Polymers 0.000 description 4
- 238000005553 drilling Methods 0.000 description 3
- 238000005065 mining Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000003317 industrial substance Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/006—Production of coal-bed methane
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- Engineering & Computer Science (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses a kind of coal bed methane exploring methods, multiple neighboring reservoirs can be opened simultaneously, realize the horizontal segment an of main borehole and multiple reservoirs and the connection of branch's well section, multiple neighboring reservoirs play synergistic effect, utilize the anti-reflection effect of top reservoir, the permeability for effectively increasing lower part reservoir, discharges production capacity to the greatest extent.The coal bed methane exploring method that this programme provides not only ensure that production capacity, but also not need another wellbore of additionally constructing, to reduce the coal-bed gas exploitation cost of multilayer system reservoir to a certain extent.
Description
Technical field
The present invention relates to energy extraction technical field, in particular to a kind of coal bed methane exploring method.
Background technique
Coal bed gas, which refers to, to be stored in coal seam using methane as main component, to be adsorbed on based on matrix of coal particle surface, portion
Divide the hydrocarbon gas for being free in coal hole or being dissolved in coal seam water, be the associated minerals resource of coal, belongs to Unconventional gas.
Coal bed gas is the clean high-grade energy and industrial chemicals to emerge in the world in nearly ten or twenty year.
Mining with surface drill well coal bed gas is that horizontal well is opened up from ground, and the horizontal segment of horizontal well enters solid coal seam, is led to
The coal bed gas in the means desorption coal output layer of drainage and step-down is crossed, the coal bed gas desorbed passes through Wellbore Flow to ground again.It is horizontal
Well increases the contact area of pit shaft and reservoir, especially multi-branched horizontal well, has linked up reservoir fracture, is most effective coal seam
Gas mining method, the gas production of coal bed gas is big and produces that the gas time is long, and methane content is high, can support large-scale commercialization benefit
With.But the well track of horizontal well runs in the guide a destination layer position, coverage is restricted, and is only capable of exploitation destination layer position
Coal bed gas, and the reservoir coal bed gas resource of adjacent layer position is moved and is not used, need additionally to construct another wellbore, could effective exploitation
Multilayer system reservoir causes the coal-bed gas exploitation of multilayer system reservoir at high cost.
Therefore, the coal-bed gas exploitation cost for how reducing multilayer system reservoir, it is urgently to be resolved to become those skilled in the art
Technical problem.
Summary of the invention
In view of this, the present invention provides a kind of coal bed methane exploring method, to reduce the coal-bed gas exploitation of multilayer system reservoir
Cost.
To achieve the above object, the invention provides the following technical scheme:
A kind of coal bed methane exploring method is suitable for the case where neighboring reservoirs spacing is greater than 10m, comprising:
Step 1) opens up horizontal well, and the horizontal well successively passes through multiple reservoirs from top to bottom, the horizontal well land in
The minimum reservoir of level height；
The well track that step 2) control hole curvature adjusts the horizontal well bores the horizontal well successively from bottom to top
Meet multiple reservoirs；
Screen casing is in the main borehole of the horizontal well under step 3), and the lower end of the screen casing is higher than minimum described of level height
Reservoir；
Step 4) is successively drilled with the horizontal segment and branch's well section of each reservoir from top to bottom.
Preferably, in above-mentioned coal bed methane exploring method, the hold angle segment length of the horizontal well is 30-50m.
Preferably, in above-mentioned coal bed methane exploring method, hole curvature described in the step 2) is less than 6 °/30m.
Preferably, in above-mentioned coal bed methane exploring method, the step 4) is specially the horizontal well according to step 2)
Hole trajectory data establish new geosteering model creep into each reservoir the horizontal segment and branch's well section.
Preferably, in above-mentioned coal bed methane exploring method, the screen casing is PE screen casing.
Preferably, in above-mentioned coal bed methane exploring method, the screen casing is glass reinforced plastic screen casing.
Preferably, in above-mentioned coal bed methane exploring method, the screen casing is PVC screen casing.
Preferably, in above-mentioned coal bed methane exploring method, in the step 3), the upper end of the screen casing and protective casing connect
It connects, the screen casing is 10-20m in the connection length of the protective casing.
It can be seen from the above technical proposal that coal bed methane exploring method provided by the invention, can open simultaneously multiple phases
Adjacent reservoir, realizes the horizontal segment an of main borehole and multiple reservoirs and the connection of branch's well section, and multiple neighboring reservoirs play association
Same effect effectively increases the permeability of lower part reservoir, discharges production capacity to the greatest extent using the anti-reflection effect of top reservoir.This
The coal bed methane exploring method that scheme provides not only ensure that production capacity, but also not need another wellbore of additionally constructing, thus one
Determine the coal-bed gas exploitation cost that multilayer system reservoir is reduced in degree.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the flow chart of coal bed methane exploring method provided in an embodiment of the present invention；
Fig. 2 is stereoscopic horizontal well provided in an embodiment of the present invention three-dimensional projection.
Specific embodiment
The invention discloses a kind of coal bed methane exploring methods, to reduce the coal-bed gas exploitation cost of multilayer system reservoir.
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Fig. 1 and Fig. 2 are please referred to, Fig. 1 is the flow chart of coal bed methane exploring method provided in an embodiment of the present invention；Fig. 2 is this
The stereoscopic horizontal well three-dimensional projection that inventive embodiments provide.
The invention discloses a kind of coal bed methane exploring methods, are suitable for the case where neighboring reservoirs spacing is greater than 10m.It rubs underground
When hindering lower, the coal bed methane exploring method that this programme provides needs the spacing between neighboring reservoirs to be greater than 50m, and underground frictional resistance is higher
When, the coal bed methane exploring method that this programme provides is suitable for the case where spacing between neighboring reservoirs is 10-50m.
This programme provide coal bed methane exploring method the following steps are included:
Step 1) opens up horizontal well, and horizontal well successively passes through multiple reservoirs from top to bottom, and horizontal well first passes around horizontal height
Spend highest reservoir, the final landing reservoir minimum in level height, that is to say, that horizontal well successively passes through multilayer system reservoir
All reservoirs；
The well track of step 2) control hole curvature adjustment horizontal well makes the pit shaft of horizontal well successively bore chance from bottom to top
Multiple reservoirs, wherein hole curvature is set according to the position of neighboring reservoirs, control hole curvature make well track gradually from
The minimum reservoir of level height enters the next to the lowest reservoir of level height, then controlling hole curvature makes well track gradually from level
Highly next to the lowest reservoir enters the low reservoir of level height third, and so on, it is highest that wellbore eventually enters into level height
Reservoir, step 2) realize the connection of multiple reservoirs of multilayer system reservoir and the main borehole of horizontal well；
Screen casing is higher than the minimum reservoir of level height in the main borehole of horizontal well, the lower end of screen casing under step 3), and screen casing is used
Main borehole more than the minimum reservoir of supporting level height, it is preferred that screen casing passes through releasing tool tripping in main borehole；
Step 4) is successively drilled with the horizontal segment and branch's well section of each reservoir from top to bottom, is specially drilled with horizontal height first
The horizontal segment and branch's well section for spending highest reservoir, are then drilled with the horizontal segment and Multilateral Wells of the high reservoir of level height second
Section, next is drilled with the horizontal segment and branch's well section of the high reservoir of level height third, and so on, finally it is drilled with level height most
The horizontal segment and branch's well section of low reservoir, horizontal segment and branch's well section along each reservoir-level or parallel are bored in step 4)
Into the horizontal segment and branch's well section opened up increases the contact area of horizontal well Yu corresponding reservoir, to ensure that coal bed gas
Production efficiency and yield.
The coal bed methane exploring method that this programme provides, can open simultaneously multiple neighboring reservoirs, the well track of horizontal well
Multiple reservoirs of multilayer system reservoir, a main borehole and the horizontal segment of multiple reservoirs and the connection of branch's well section are navigated within, it is multiple
Neighboring reservoirs play synergistic effect, using the anti-reflection effect of top reservoir, effectively increase the permeability of lower part reservoir, utmostly
Release production capacity.The coal bed methane exploring method that this programme provides not only ensure that production capacity, but also not need additionally to construct another
Wellbore, to reduce the coal-bed gas exploitation cost of multilayer system reservoir to a certain extent.
Horizontal well includes straight well section, inclination section, steady tilted section and horizontal segment, it is preferred that is opened up and multiple reservoirs from steady tilted section
The pit shaft of connection controls hole curvature that is, since the steady tilted section and adjusts well track, hole curvature with target reservoir position
It is set, target reservoir is next reservoir for preparing to bore chance.
When target reservoir opens up horizontal segment and branch's well section, need to consider the construction energy of drilling machine and Underwell guide tool
Power completes default drilling depth, while the number for branch's well section that target reservoir needs to open up is determined according to the resources supplIes of target reservoir
Amount and footage drilled, can lay more branch's well sections and longer footage drilled in the case that target reservoir resources supplIes are good.
In order to further optimize the above technical scheme, the coal bed methane exploring method that this programme provides, the steady tilted section of horizontal well
Length is 30-50m, to cope with the uncertainty of reservoir buried depth.
Hole curvature is less than 6 °/30m in step 2).
Step 4) is specially to establish new geosteering model according to the hole trajectory data of horizontal well in step 2) to creep into
The horizontal segment and branch's well section of each reservoir, to improve the Drilling ratio of reservoir.
Screen casing uses nonmetallic screen casing in this programme, and preferred screen casing is PE (polyethylene) screen casing, glass reinforced plastic (FRP) screen casing
Or PVC (polyvinyl chloride) screen casing.
Glass reinforced plastic screen casing is light and hard, non-conductive, and performance is stablized, high mechanical strength, recycles less, corrosion-resistant.
PE screen casing has stronger shock resistance and wearability, can guarantee the job requirements of screen casing.
PVC screen casing has enough use intensities, can guarantee the job requirements of screen casing.
In step 3), the upper end of screen casing is connect with protective casing, and screen casing is 10-20m in the connection length of protective casing, with
Guarantee screen casing in the bonding strength of protective casing.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (8)
1. a kind of coal bed methane exploring method is suitable for the case where neighboring reservoirs spacing is greater than 10m characterized by comprising
Step 1) opens up horizontal well, and the horizontal well successively passes through multiple reservoirs from top to bottom, and the horizontal well lands in level
The highly minimum reservoir；
It is more that the well track that step 2) control hole curvature adjusts the horizontal well makes the horizontal well successively bore chance from bottom to top
A reservoir；
Screen casing is higher than the minimum storage of level height in the main borehole of the horizontal well, the lower end of the screen casing under step 3)
Layer；
Step 4) is successively drilled with the horizontal segment and branch's well section of each reservoir from top to bottom.
2. coal bed methane exploring method according to claim 1, which is characterized in that the hold angle segment length of the horizontal well is
30-50m。
3. coal bed methane exploring method according to claim 1, which is characterized in that hole curvature described in the step 2) is small
In 6 °/30m.
4. coal bed methane exploring method according to claim 1, which is characterized in that the step 4) is specially according to step 2)
Described in horizontal well hole trajectory data establish new geosteering model creep into each reservoir the horizontal segment and
Branch's well section.
5. coal bed methane exploring method according to claim 1, which is characterized in that the screen casing is PE screen casing.
6. coal bed methane exploring method according to claim 1, which is characterized in that the screen casing is glass reinforced plastic screen casing.
7. coal bed methane exploring method according to claim 1, which is characterized in that the screen casing is PVC screen casing.
8. coal bed methane exploring method according to claim 1, which is characterized in that in the step 3), the screen casing it is upper
End is connect with protective casing, and the screen casing is 10-20m in the connection length of the protective casing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810971547.4A CN110242254B (en) | 2018-08-24 | 2018-08-24 | Coal bed gas mining method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810971547.4A CN110242254B (en) | 2018-08-24 | 2018-08-24 | Coal bed gas mining method |
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| Publication Number | Publication Date |
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| CN110242254A true CN110242254A (en) | 2019-09-17 |
| CN110242254B CN110242254B (en) | 2021-08-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810971547.4A Active CN110242254B (en) | 2018-08-24 | 2018-08-24 | Coal bed gas mining method |
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Cited By (1)
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| CN111706302A (en) * | 2020-08-21 | 2020-09-25 | 山东科瑞石油技术有限公司 | Integrated process method for short-target front-distance horizontal well of coal-bed gas well |
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| CN110242254B (en) | 2021-08-20 |
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