CN107859482B - A kind of halberd formula coal bed gas horizontal well drilling method - Google Patents
A kind of halberd formula coal bed gas horizontal well drilling method Download PDFInfo
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- CN107859482B CN107859482B CN201610843197.4A CN201610843197A CN107859482B CN 107859482 B CN107859482 B CN 107859482B CN 201610843197 A CN201610843197 A CN 201610843197A CN 107859482 B CN107859482 B CN 107859482B
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- 238000005553 drilling Methods 0.000 title claims abstract description 81
- 239000003245 coal Substances 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000009826 distribution Methods 0.000 claims abstract description 4
- 238000010276 construction Methods 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000005304 joining Methods 0.000 claims description 5
- 230000001681 protective effect Effects 0.000 claims description 5
- 241001074085 Scophthalmus aquosus Species 0.000 claims description 4
- 206010017076 Fracture Diseases 0.000 description 11
- 208000010392 Bone Fractures Diseases 0.000 description 10
- 238000005065 mining Methods 0.000 description 10
- 238000013461 design Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000006837 decompression Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000000750 progressive effect Effects 0.000 description 2
- 241000269793 Cryothenia peninsulae Species 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
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- 238000004891 communication Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000013213 extrapolation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- 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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
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- 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
- E21B43/02—Subsoil filtering
- E21B43/10—Setting of casings, screens, liners or the like in wells
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- 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
- E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells
- E21B43/305—Specific pattern of wells, e.g. optimising the spacing of wells comprising at least one inclined or horizontal well
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Abstract
The invention discloses a kind of halberd formula coal bed gas horizontal well drilling methods, comprising: bores a single branch horizontal well；Bore multi-branched horizontal well；Another single branch horizontal well is bored, wherein boring multi-branched horizontal well includes: that the landing from multi-branched horizontal well in purpose coal seam is lighted, bores the main branch of first segment；The main branch of first segment first the first side of sidetracking branch from forward end to this section of main branch；The main branch of second segment is bored in the forward end of the main branch of first segment；The main branch of the second segment forward end to second sidetracking second side branch of the main branch of the second segment, the first side is opposite with second side；One section of main branch alternately is bored in the forward end of the main branch of the preceding paragraph and bores a branch, each branch and a upper distribution in the opposite side of main branch in the forward end of this section of main branch；The multi-branched horizontal well finishing drilling when main branch reaches the target spot in purpose coal seam.Drilling method Drilling ratio of the invention is high, and control gas area is big.
Description
Technical field
The present invention relates to Coal-seam Gas Recovery Technologies field more particularly to a kind of halberd formula coal bed gas horizontal well drilling methods.
Background technique
Middle high rank coal reservoir permeability is low, heterogeneity is strong, and there are fracturing fractures to prolong for conventional vertical well fracture production method
Stretch distance, fracture height is difficult to control, mining average product is lower, yield failure problem；There are control planes for single branch horizontal well
Product it is small, it is difficult to formed effective area decompression, while valley terrain, the forest is dense area, well site selection exist very big limitation.
Therefore, using well site dispose multiple horizontal wells and optimum organization can solve fracture extension direction, distance, height and
The problems such as being effectively formed area decompression.
Currently, coal bed gas horizontal well is many kinds of, mainly there is Pinnate horizontal drilling, U-shaped well two types.Pinnate horizontal drilling is logical
It is often made of a bite engineering well and a bite mining straight well, engineering well uses the form drilling well of double main branch, multiple-limb.The well type drilling well
Mode is subdrilling mining straight well, after drilling purpose coal seam, continues 80-100 meters of probing downwards and stays and make pocket；Then drilling project
Well, engineering well 200 meters or so landings before mining well pass through mining well, subdrilling side master then along purpose drilling in coal
Branch, then by distally proximally drilling 5-6 branch in main branch, after the completion, then bores main branch and the branch of the other side, main branch and divides
Zhi Junwei barefoot completion.It is straight that U-shaped well by a bite engineering well and a bite mining well construction, usually first drills mining in lower location of the structure
Then well passes through mining well to lower curtate position drilling project well in structural high part, forms U-shaped well, early stage, coal seam section is all naked eye
Complete well started tripping in PVC sieve tube completion in recent years.From the point of view of Area of a well and oil in place, the former is usually straight well
8-10 times, drilling cost is also 8-10 times of individual well；The latter is usually 4 times of straight well or so, and drilling cost is also 4 times of individual well
Left and right.
The problem of both horizontal wells generally existing three aspect, first is that when coal seam thickness is relatively thin (3-5 meters), in drilling process
Often go out layer, causes coal seam Drilling ratio lower, influence coal bed gas well capacity；Second is that horizontal segment barefoot completion, be easy to cause well
Wall collapses, and Production of Coal-bed Gas Wells is caused to decline or scrap；Third is that existing horizontal well is generally arranged by a bite engineering well and flatly
Straight well composition is adopted, causes drilling cost high, takes up a large area, the problems such as well site is preferably limited to.
Summary of the invention
In order to solve the above technical problems, the present invention provides a kind of halberd formula coal bed gas horizontal well drilling method, to provide
A kind of horizontal well drilling method that coal seam Drilling ratio is high.
Specifically, including technical solution below:
A kind of halberd formula coal bed gas horizontal well drilling method, the halberd formula coal bed gas horizontal well include be located at two sides two
A list and is located in the middle multi-branched horizontal well at branch horizontal well, this method comprises:
Bore a single branch horizontal well；
Bore multi-branched horizontal well；
Another single branch horizontal well is bored,
Wherein the brill multi-branched horizontal well includes:
Landing from the multi-branched horizontal well in purpose coal seam is lighted, and the main branch of first segment is bored；
The main branch of the first segment first the first side of sidetracking branch from forward end to this section of main branch；
The main branch of second segment is bored in the forward end of the main branch of the first segment；
In second sidetracking second side branch of the forward end to the main branch of the second segment of the main branch of the second segment, first side
It is opposite with described second side；
One section of main branch alternately is bored in the forward end of the main branch of the preceding paragraph and bores a branch in the forward end of this section of main branch,
The opposite side of each branch and a upper distribution in the main branch；
The multi-branched horizontal well finishing drilling when the main branch reaches the target spot in purpose coal seam.
Selectively, further includes:
Before drilling well, direction is developed according to structural environment, geological tasks and coal seam fracture, sets each horizontal well
Well point position, drilling direction and distance.
Selectively, further includes:
Before boring each horizontal well, straight well is carried out in corresponding well point position and leads eye probing and coring.
Selectively, further includes:
For each horizontal well, after straight well leads eye probing and coring, before executing horizontal drilling operation, side is executed
It bores, is crept into the dog-leg severity of setting to landing point.
Selectively, the dog-leg severity set is 7 °/30m to 9 °/30m.
Selectively, further includes:
After straight well leads eye probing and coring, before executing sidetracking, according to results of drilling, purpose seam construction is corrected
Figure calculates the stratigraphic dip in purpose coal seam.
Selectively, further includes:
Straight well well section after straight well leads eye probing and coring, before executing sidetracking, near scheduled side tracking point
Cementing plug.
Selectively, the length of projection of each branch on the extending direction of the main branch is greater than the end with the branch
The length of the next section of main branch to connect.
Selectively, after boring each branch, seam construction figure, next section of main branch are corrected also according to results of drilling
Drilling direction adjusted according to revised seam construction figure.
Selectively, the size of angle formed by each branch and next section of main branch with the joining distal ends of the branch
It is 30 ° to 40 °.
Selectively, further includes:
When reaching horizontal well after the target spot in purpose coal seam, by the main branch tripping in screen casing, branch's barefoot completion.
Selectively, further includes:
After each single branch horizontal well finishing drilling, tripping in protective casing to shaft bottom.
Technical solution provided in an embodiment of the present invention the utility model has the advantages that
1, by disposing three mouthfuls of water horizontal wells in a well site, land area is reduced than disposing horizontal well respectively in three well sites
55% or more, and can eliminate mining straight well from engineering well (i.e. horizontal well) direct mining, reduce drilling cost.
2, one section of main Zhi Hou Dou Zuanyiduan branch of every brill specifies next section of attitude of coal, energy by progressive drilling
Amendment seam construction figure in time, improves coal seam Drilling ratio；
3, by distinguishing tripping in casing and screen casing in main branch, wellbore stability has been effectively kept, and maintenance work can be carried out
Industry extends drilling well service life；
4, by rationally designing the angle and length of main branch spacing, each branch and main branch, coal seam reservoirs has effectively been linked up and have been split
Seam expands control gas area.
5, the horizontal well control gas area of halberd formula is 2-7 times of multi-branched horizontal well, single single branch horizontal well and straight well respectively,
And well yield is then respectively up to 2-8 times.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is the flow chart of halberd formula coal bed gas horizontal well drilling method according to an embodiment of the invention.
Fig. 2 is the flow chart of the specific steps of the step S2 in Fig. 1.
Fig. 3 is the floor map of an illustrative halberd formula coal bed gas horizontal well of the invention.
Specific embodiment
To keep technical solution of the present invention and advantage clearer, below in conjunction with attached drawing to embodiment of the present invention make into
One step it is described in detail.
The main idea of the present invention is successively bore the single branch horizontal well for being located at side, positioned at intermediate more horizontal wells and be located at
Another single branch horizontal well of the other side, is alternately performed the drilling of main branch and branch, passes through branch when wherein boring more horizontal wells
Drilling verify the coal seam height above sea level that next section of main branch will pass through, correct main branch drilling direction, and control gas is expanded by halberd formula well
Area, to improve methane output.
Conceived based on foregoing invention, one embodiment of the invention provides a kind of halberd formula coal bed gas horizontal well drilling method, halberd
Formula coal bed gas horizontal well includes being located at two single branch horizontal wells of two sides and being located in the middle multi-branched horizontal well, is such as schemed
Shown in 1, this method comprises:
Step S11: a single branch horizontal well is bored；
Step S2: multi-branched horizontal well is bored；
Step S3: another single branch horizontal well is bored.
Wherein as shown in Fig. 2, step S2 specifically:
Step S21: the landing from horizontal well in purpose coal seam is lighted, and bores the main branch of first segment.
Step S22: the main branch of first segment forward end (end opposite with the starting point of this section of main branch) to section master
First the first side of sidetracking branch of branch.
Step S23: the main branch of second segment is bored in the forward end of the main branch of first segment.
Step S24: the main branch of the second segment second sidetracking second side branch from forward end to the main branch of the second segment,
Side is opposite with second side.
Then, one section of main branch alternately is bored in the forward end of the main branch of the preceding paragraph and bore one in the forward end of this section of main branch
The opposite side of branch, each branch and a upper distribution in main branch, the finishing drilling when main branch reaches the target spot in purpose coal seam.
This can specifically be realized through the following steps:
Step S25: one section of main branch is bored in the forward end of the main branch of the preceding paragraph.
When main branch does not reach scheduled target spot, step S6, otherwise multi-branched horizontal well finishing drilling are carried out.
Step S26: a branch is bored in the forward end of this section of main branch.
It in the present embodiment,, can due to one section of main Zhi Hou Dou Zuanyiduan branch of every brill when boring multi-branched horizontal well
The seam construction that next section of main branch will pass through is verified with the drilling by branch, main branch drilling direction is corrected, to effectively mention
The Drilling ratio in high coal seam avoids drilling direction mistake from leading to unnecessary loss；Two single branch horizontal wells are divided into more simultaneously
The two sides of branch horizontal well, effective communication coal seam reservoirs cracks expand control gas area, improve well yield.
On the basis of the above scheme of the present embodiment, following improvement can be also done:
Before drilling well, direction is developed according to structural environment, geological tasks and coal seam fracture, sets each horizontal well
Well point position, drilling direction and distance (the distance between main branch straightway of adjacent level well).Where the position of well point
Well site size will admit three mouthfuls of water horizontal wells of arrangement, typically no less than 80 × 150m, between the well point position of adjacent level well between
Away from generally 5m or so, the main Zhi Pinghang of straightway, distance can be 200m between landing point, and distance can also be 200m between target spot.
Before boring each horizontal well, straight well is carried out in corresponding well point position and leads eye probing and coring.To obtain mesh
The relevant parameters such as coal seam buried depth, thickness, coal seam and roof and floor property.
For each horizontal well, after straight well leads eye probing and coring, horizontal drilling operation is being executed (i.e. from landing point
The drilling of beginning) before, sidetracking can be performed, crept into the dog-leg severity of setting to landing point.The dog-leg severity of setting may be, for example, 7 °/
30m to 9 °/30m.Dog-leg severity refers to that, from any in wellbore to another point, wellbore direction of advance changes in vertical direction
Angle.The angle is to reflect the variation of hole deviation angle, and reflect the variation of orientation angles, is usually called rate of over-all angle change
Or hole curvature.Single branch horizontal well, which also needs gradually to elapse outward with respect to multi-branched horizontal well in the horizontal direction, reaches landing point.
After straight well leads eye probing and coring, before executing sidetracking, purpose coal seam structure can be corrected according to results of drilling
Figure is made, the stratigraphic dip in purpose coal seam is calculated, consequently facilitating selected or amendment side tracking point.
Straight well well section after straight well leads eye probing and coring, before executing sidetracking, near scheduled side tracking point
Cementing plug.Cement plug may be, for example, 150m, 2 meters or so for example below side tracking point of highest point, in order to putting for drilling tool
It sets.
For multi-branched horizontal well, the length of projection of preferably each branch on the extending direction of main branch is greater than and this point
The length of next section of main branch of the joining distal ends of branch.Done to the extending direction of main branch vertical in the end far from main branch of i.e. each branch
Directly in the vertical line of the direction, the point intersected with the direction has exceeded the next section of main branch with the joining distal ends of the branch.Such as it is every
The main branch 150m of section, every section of branch 200m, each branch and the absolute value of main branch angle are 35 °.Boring next section of master in this way
Before branch, the length of branch, which already ensures that, can verify the seam construction that next section of main branch will pass through.
After boring each branch, seam construction figure, the drilling direction root of next section of main branch are corrected also according to results of drilling
It is adjusted according to revised seam construction figure.In this way cost waste can be reduced to avoid drilling direction mistake.Meanwhile boring one
After single branch horizontal well, also stratigraphic dip can be calculated according to drilling well modified result structural map.
The size of angle formed by each branch and next section of main branch with the joining distal ends of the branch can be 30 ° and arrive
40°.Such angle is not only conducive to expand control gas area, but also helps to verify the coal seam situation of main branch direction of advance.
It, can be by main branch tripping in screen casing, branch's barefoot completion when reaching multi-branched horizontal well after the target spot in purpose coal seam.It is logical
It crosses in main branch tripping in screen casing, has effectively kept wellbore stability, and upkeep operation can be carried out, extended drilling well service life.
It is preferred that after each single branch horizontal well finishing drilling, tripping in protective casing to shaft bottom.
Fig. 3 is the floor map of an illustrative progressive drilling herring-bone form coal bed gas horizontal well, and in figure, solid line is water
The projection of horizontal well wellbore trace in the plane, chain-dotted line are the gas-bearing area boundary of horizontal well control, and dotted line is coal petrography major fracture
Develop direction.
P1, P2, P3: being respectively the pithead position of three mouthfuls of water horizontal wells, spacing 5m.
P1 landing point, P2 landing point, P3 landing point: being respectively three mouthfuls of water horizontal wells in the landing point position of target zone, spacing
For 200m.
P1 target spot, P2 target spot, P3 target spot: being respectively target position of three mouthfuls of water horizontal wells in purpose coal seam, spacing 200m.
P1 landing point-P1 target spot, P2 landing point-P2 target spot, P3 landing point-P3 target spot: being respectively the master of three mouthfuls of water horizontal wells
Branch creeps into plane and straight line section track, and length is respectively 1000m.
L1 point, L2 point, L3 point, L4 point, L5 point, L6 point: being respectively sidetracking of each branch of multi-branched horizontal well in main branch
Point (forward end i.e. in above example), spacing 150m, another L1 point is also 150m away from P1 landing point.
L1, L2, L3, L4, L5, L6: being respectively target position of each branch in purpose coal seam.
L1 point-L1, L2 point-L2, L3 point-L3, L4 point-L4, L5 point-L5, L6 point-L6: for the drilling plane rail of 6 branches
Mark, length are respectively 200m.
L1 point-L1 branch, L3 point-L3 branch, L5 point-L5 branch and the angle of main branch are+35 °, L2 point-L2 branch, L4
The angle of point-L4 branch, L6 point-L6 branch and main branch is -35 °.
The determination on gas-bearing area boundary: respectively using P1 landing point, P3 landing point, P1 target spot, P3 target spot as the line of basic point
Rectangle one well spacing of extrapolation, well spacing 250m.
Vertical coal seam fracture development direction is subject in the practical drilling orientation of each main branch track of horizontal well, is typically chosen vertical
Straight or wide-angle oblique coal seam major fracture.
Mouth coordinate placement position combines well site true form and Horizontal Well Drilling to optimize implementation, adjacent well head into orientation
Spacing keeps 5m constant.
Introduce concrete application of the invention with another embodiment again below.
Qinshui basin somewhere, purpose coal seam are the coal seam 3#, buried depth 1061.65-1067.70m, thickness 6.05m, coal
Layer air content is 16-21m3/t；Coal petrography major fracture develops direction mainly between N46 ° of E-N57 ° of E, and major fracture development density is
4-16 item/cm, in conjunction with seismic profile, horizontal well path azimuth design is 292.5 °；The area is simple synclinal structure, and stratum is inclined
Generally between 0.45-3.48 °, well head is located to oblique bottom at angle；According to attitude of stratum variation and Characteristics of Fault Developed, design
The main Zhi Changdu of net horizontal section is 800m, and six, branch, length is respectively 150-250m, and well bore is designed as two opening structures.
Steps are as follows for drilling:
(1) spudded in the rotary drill of D311.2mm is first into 60m in the first well head, it is ensured that drill bedrock weathering zone, tripping in
D244.5mm surface pipe 58m, cementing sealing regolith, gravel layer.
With the PDC drill bit of D215.9mm two spud in into, be drilled into away from purpose coal seam top 5m start coring 20m, continue later
25m finishing drilling is crept into, and bores data correction structural map according to real.
(3) the well section cementing plug 150m near side tracking point starts sidetracking list branch horizontal well, is bored with the PDC of D215.9mm
Head, according to 8 °/30m dog-leg severity mode sidetracking to the first landing point (the first landing point away from the first well head horizontal displacement 279.33m,
336.77 ° of orientation).
According to 292.5 ° of orientation horizontal well drilling segment length 800m after, the protective casing of tripping in D139.7mm to lower completion,
And correcting structure figure, calculate stratigraphic dip.
(5) drilling machine moves westwards 5m to the second well head, is spudded in the rotary drill of D311.2mm is first into 60m, tripping in D244.5mm table
Layer casing 58m, cementing sealing regolith, gravel layer.
(6) spudded in the PDC drill bit of D215.9mm two into creeping into according to 8 °/30m dog-leg severity mode to the second landing point (
Two landing points are away from the second well head horizontal displacement 200m, 292.5 ° of orientation).
(7) after boring the first branch point of main branch 150m arrival, with 257.5 ° of first branches of orientation angular bit, 150m is crept into, to verify
The coal seam height above sea level that next section of main branch will pass through, correcting structure figure after the finishing drilling of the first branch.
(8) drill bit is drawn back to the first branch point and creeps into main branch 100m according to 292.5 ° of orientation on the basis of neotectonic map
The second branch point is reached, then with 327.5 ° of second branches of orientation angular bit, creeping into 150m terminates, will to verify next section of main branch
The coal seam height above sea level passed through, and correcting structure figure.
(9) drill bit is drawn back to the second branch point and continues to creep into main branch according to 292.5 ° of orientation on the basis of neotectonic map
100m reaches third branch point, and then with 257.5 ° of orientation angular bit third branches, creeping into 200m terminates, to verify next section of main branch
The coal seam height above sea level that will be passed through, and correcting structure figure.
(10) drill bit is drawn back to third branch point and continues to creep into main branch according to 292.5 ° of orientation on the basis of neotectonic map
100m reaches the 4th branch point, and then with 327.5 ° of the 4th branches of orientation angular bit, creeping into 200m terminates, to verify next section of main branch
The coal seam height above sea level that will be passed through, and correcting structure figure.
(11) drill bit is drawn back to the 4th branch point and continues to creep into main branch according to 292.5 ° of orientation on the basis of neotectonic map
100m reaches quintafurcation point, and then with 257.5 ° of orientation angular bit quintafurcations, creeping into 250m terminates, to verify next section of main branch
The coal seam height above sea level that will be passed through, and correcting structure figure.
(12) drill bit is drawn back to quintafurcation point and continues to creep into main branch according to 292.5 ° of orientation on the basis of neotectonic map
100m reaches the 6th branch point, and then with 327.5 ° of the 6th branches of orientation angular bit, creeping into 250m terminates, to verify next section of main branch
The coal seam height above sea level that will be passed through, and correcting structure figure.
(13) drill bit is drawn back to the 6th branch point and continues to creep into main branch according to 292.5 ° of orientation on the basis of neotectonic map
150m is to target spot finishing drilling.
(14) bore up to after design well depth, main branch tripping in D139.7mm screen casing, branch's barefoot completion.(the main Zhi Changdu of horizontal segment
800m, 6 branch cumulative length 1200m.)
(15) drilling machine moves westwards 5m to third well head, is spudded in the rotary drill of D311.2mm is first into 60m, tripping in D244.5mm table
Layer casing 58m, cementing sealing regolith, gravel layer.
(16) spudded in the PDC drill bit of D215.9mm two into creeping into according to 8 °/30m dog-leg severity mode to 3 (third of landing point
Landing point is away from third well head horizontal displacement 279.33m, 248.23 ° of orientation).
(17) according to 292.5 ° of orientation horizontal well drilling segment length 800m after, tripping in D139.7mm protective casing to lower completion.
The above is merely for convenience of it will be understood by those skilled in the art that technical solution of the present invention, not to limit
The present invention.All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in this
Within the protection scope of invention.
Claims (12)
1. a kind of halberd formula coal bed gas horizontal well drilling method, which is characterized in that the halberd formula coal bed gas horizontal well includes difference position
In two of two sides single branch horizontal wells and it is located in the middle multi-branched horizontal well, this method comprises:
Bore a single branch horizontal well；
Bore multi-branched horizontal well；
Another single branch horizontal well is bored,
Wherein the brill multi-branched horizontal well includes:
Landing from the multi-branched horizontal well in purpose coal seam is lighted, and the main branch of first segment is bored；
The main branch of the first segment first the first side of sidetracking branch from forward end to this section of main branch；
The main branch of second segment is bored in the forward end of the main branch of the first segment；
In second sidetracking second side branch of the forward end to the main branch of the second segment of the main branch of the second segment, first side and institute
It is opposite to state second side；
One section of main branch alternately is bored in the forward end of the main branch of the preceding paragraph and bores a branch in the forward end of this section of main branch, each
The opposite side of branch and a upper distribution in the main branch；
The multi-branched horizontal well finishing drilling when the main branch reaches the target spot in purpose coal seam.
2. the method according to claim 1, wherein further include:
Before drilling well, direction is developed according to structural environment, geological tasks and coal seam fracture, sets the well point of each horizontal well
Position, drilling direction and distance.
3. according to the method described in claim 2, it is characterized by further comprising:
Before boring each horizontal well, straight well is carried out in corresponding well point position and leads eye probing and coring.
4. according to the method described in claim 3, it is characterized by further comprising:
For each horizontal well, after straight well leads eye probing and coring, before executing horizontal drilling operation, sidetracking is executed,
It is crept into the dog-leg severity of setting to landing point.
5. according to the method described in claim 4, it is characterized in that, the dog-leg severity set is 7 °/30m to 9 °/30m.
6. according to the method described in claim 4, it is characterized by further comprising:
After straight well leads eye probing and coring, before executing sidetracking, according to results of drilling, purpose seam construction figure is corrected,
Calculate the stratigraphic dip in purpose coal seam.
7. according to the method described in claim 4, it is characterized by further comprising:
After straight well leads eye probing and coring, before executing sidetracking, the straight well well section near scheduled side tracking point is fetched water
The bod.
8. method according to claim 1-7, which is characterized in that extending direction of each branch in the main branch
On the length of projection be greater than length with next section of main branch of the joining distal ends of the branch.
9. method according to claim 1-7, which is characterized in that after boring each branch, also according to
Results of drilling corrects seam construction figure, and the drilling direction of next section of main branch is adjusted according to revised seam construction figure.
10. method according to claim 1-7, which is characterized in that each branch and the end with the branch
The size for holding angle formed by the next section of main branch to connect is 30 ° to 40 °.
11. method according to claim 1-7, which is characterized in that further include:
When reaching horizontal well after the target spot in purpose coal seam, by the main branch tripping in screen casing, branch's barefoot completion.
12. method according to claim 1-7, which is characterized in that further include:
After each single branch horizontal well finishing drilling, tripping in protective casing to shaft bottom.
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|---|---|---|---|---|
| JP2003269681A (en) * | 2002-03-15 | 2003-09-25 | Maezawa Kyuso Industries Co Ltd | Method of replacing saddle snap tap and replacing device |
| CN101949284A (en) * | 2010-09-25 | 2011-01-19 | 北京奥瑞安能源技术开发有限公司 | Coalbed methane horizontal well system and construction method thereof |
| CN201763308U (en) * | 2010-04-26 | 2011-03-16 | 徐萍 | Fishbone well type structure |
| CN104265261A (en) * | 2014-08-11 | 2015-01-07 | 中国石油天然气股份有限公司 | Fishbone-shaped branch horizontal well structure |
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| US7246940B2 (en) * | 2003-06-24 | 2007-07-24 | Halliburton Energy Services, Inc. | Method and apparatus for managing the temperature of thermal components |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003269681A (en) * | 2002-03-15 | 2003-09-25 | Maezawa Kyuso Industries Co Ltd | Method of replacing saddle snap tap and replacing device |
| CN201763308U (en) * | 2010-04-26 | 2011-03-16 | 徐萍 | Fishbone well type structure |
| CN101949284A (en) * | 2010-09-25 | 2011-01-19 | 北京奥瑞安能源技术开发有限公司 | Coalbed methane horizontal well system and construction method thereof |
| CN104265261A (en) * | 2014-08-11 | 2015-01-07 | 中国石油天然气股份有限公司 | Fishbone-shaped branch horizontal well structure |
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