CN203334956U - Multi-branch horizontal well system suitable for coalbed methane of uniclinal structure - Google Patents
Multi-branch horizontal well system suitable for coalbed methane of uniclinal structure Download PDFInfo
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- CN203334956U CN203334956U CN2013203060077U CN201320306007U CN203334956U CN 203334956 U CN203334956 U CN 203334956U CN 2013203060077 U CN2013203060077 U CN 2013203060077U CN 201320306007 U CN201320306007 U CN 201320306007U CN 203334956 U CN203334956 U CN 203334956U
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Abstract
The utility model discloses a multi-branch horizontal well system suitable for coalbed methane of a uniclinal structure and belongs to the field of ground coalbed methane exploitation. The multi-branch horizontal well system suitable for the coalbed methane of the uniclinal structure is composed of two or more multi-branch horizontal well sets. Each multi-branch horizontal well set is composed of a technology well, a near-end communicated well and a far-end communicated well. The far-end communicated well of the second multi-branch horizontal well set is the near-end communicated well of the first multi-branch horizontal well set. The multi-branch horizontal well sets are sequentially connected in series according to the sequence, so that the multi-branch horizontal well system is formed, wherein the length of a main branch horizontal section is the sum of the lengths of all main branches of multi-branch technology well sets. All the near-end communicated wells and all the far-end communicated wells are approximately on the same straight line and communicated with the main branches of all the technology wells respectively. The multi-branch horizontal well system suitable for the coalbed methane of the uniclinal structure effectively solves the problem that resources between each technology well and a drainage and mining well cannot be controlled in the exploitation of the coalbed methane of the uniclinal structure and has the multi-well simultaneous-drainage function and the sectional monitoring function.
Description
Technical field
The utility model relates to the horizontal well in a kind of ground coal bed gas recovery process, particularly relates to the horizontal well system used in the monocline geological structure, belongs to ground coal bed gas exploitation field.
Background technology
Monoclinal structure is one of common constitution in cbm development, and the trend that refers to stratum is all the time towards the stratum of some directions.Current scene adopts conventional multi-branched horizontal well to be exploited.But conventional multi-branched horizontal well has more limitation: the one, be subject to the impact of coal seam buried depth, and the 2nd, be subject to rig to hook the limitation of loading capability, the 3rd, be subject to the restriction of drilling tool backing pressure phenomenon, the 4th, be subject to the restriction of drilling cost.Occupy above-mentioned many limitation, cause the development length of conventional multi-branched horizontal well horizontal segment in the coal seam of monoclinal structure to be restricted, under the condition that is 400m-1000m in the coal seam buried depth, the horizontal segment master of a bite coal bed gas horizontal well props up maximum length and generally is no more than 1500m, thereby has limited Area of a well and gas output per well.In addition, under existing drilling technology condition, well section (being distance before the target) distance that the process well of conventional multi-branched horizontal well and row adopt between well is generally 200m-500m, account for 1/5th to 1/3rd of multi-branched horizontal well master Zhi Changdu, this part well section can't horizontal well drilling branch, causes the resource of this part well section uncontrollable.Due to the domestic special horizontal well technology for monocline geological structure coal seam that also there is no maturation, so address the above problem, have important practical significance.
Summary of the invention
The purpose of this utility model is to provide a kind of multi-lateral horizontal well system for coal bed gas that is applicable to monoclinal structure, solve in the cbm development of monoclinal structure, process well and row adopt well section between well can't horizontal well drilling branch, causes the uncontrollable problem of this part resource.Simultaneously, not only can increase multi-branched horizontal well master Zhi Changdu, and have that many wells are arranged altogether, the sectional monitoring function.
The purpose of this utility model realizes by following proposal: a kind of multi-lateral horizontal well system for coal bed gas that is applicable to monoclinal structure consists of two or more multi-branched horizontal well well groups, it is characterized in that: each multi-branched horizontal well well group is by a bite process well, a bite near-end connected well, a bite far-end connected well forms, the far-end connected well of second multi-branched horizontal well well group is the near-end connected well of first multi-branched horizontal well well group, the far-end connected well of the 3rd multi-branched horizontal well well group is the near-end connected well of second multi-branched horizontal well well group, the 3rd later multi-branched horizontal well well group is cascaded successively according to said sequence, form a master and propped up the multi-lateral horizontal well system that horizontal section length is each multiple-limb technique well group master Zhi Changdu sum.
Described a kind of multi-lateral horizontal well system for coal bed gas that is applicable to monoclinal structure is characterized in that: all near-end connected well, far-end connected wells all are similar on the same straight line, and prop up and be connected with the master of each process well respectively.
Described a kind of multi-lateral horizontal well system for coal bed gas that is applicable to monoclinal structure, it is characterized in that: have a bite near-end connected well to adopt well as row, and it is the near-end connected well that is positioned at the minimum position of monoclinal structure, coal seam that row adopts well, row adopts the water pumping gas production of well for this multi-lateral horizontal well system.
Described a kind of multi-lateral horizontal well system for coal bed gas that is applicable to monoclinal structure, it is characterized in that: row adopts all near-end connected wells beyond well and far-end connected well as monitor well, and monitor well is positioned at the monocline seam construction updip direction that row adopts well, monitor well is for strata pressure observation and manufacturing process Real-Time Monitoring.
The beneficial effects of the utility model are: the utility model is by the far-end connected well using the near-end connected well of previous multi-branched horizontal well well group as a rear multi-branched horizontal well well group, it is a multi-lateral horizontal well system for coal bed gas that a plurality of multi-branched horizontal well well groups are in turn connected into, thereby efficiently solve in the cbm development of monoclinal structure, under existing drilling technology condition, process well and row adopt well section between well can't horizontal well drilling branch, causes the uncontrollable problem of this part resource; The utility model master props up horizontal section length for each multiple-limb process well master Zhi Changdu sum, has increased multi-branched horizontal well master Zhi Changdu, thereby has improved Area of a well and gas output per well; Realized that a plurality of multi-branched horizontal well groups adopt well by row flatly and carry out water pumping gas production, that is: many wells are arranged altogether, have reduced row and have adopted well quantity, thereby reduced input and floor space that row adopts equipment; The utlity model has many mouthfuls of monitor wells, realized carrying out the monitoring of segmentation real-time pressure by monitor well in the coal-bed gas exploitation process, can monitor in time between each monitor well and each monitor well is adopted the situation that is communicated with between well with row, be conducive to guarantee the even running that coal bed gas is produced.
The accompanying drawing explanation
Accompanying drawing is structural representation of the present utility model.
In figure: 1. first process well; 2. the near-end connected well of first process well (the far-end connected well of second mouthful of process well); 3. the far-end connected well of first process well; 4. the master of first process well props up; 5. the master of second mouthful of process well props up; 6. the master of the 3rd mouthful of process well props up; 7. the 3rd mouthful of process well; 8. the near-end connected well of the 3rd mouthful of process well; 9. second mouthful of process well; 10. the near-end connected well of second mouthful of process well (the far-end connected well of the 3rd mouthful of process well).
The specific embodiment
Below in conjunction with specific embodiment, with regard to the utility model, be described further.A kind of multi-lateral horizontal well system for coal bed gas that is applicable to monoclinal structure described in the utility model consists of two or more multi-branched horizontal well well groups, the present embodiment consists of three multi-branched horizontal well well groups, and accompanying drawing can be used as the structural representation of the present embodiment.
Certain sedimentary basin has a monoclinal structure coal seam, and seam inclination is 4 °, coal seam buried depth 620m, and thickness is 6.5m.At first, bore a bite straight well in the high-order bit of this monoclinal structure, as the far-end connected well (3) of first process well, this well adopts two body structures that drive a well.One opens and uses the D311.2mm rock bit, after drilling bedrock weathering zone 20m, and with well depth 60m finishing drilling, lower D244.5mm surface pipe, depth of setting 58m, cementing concrete returns to ground, sealing regolith, layer of gravel; Two open and use the D215.9mm drill bit, drill the following 30m completion in boundary at the bottom of coal seam, and degree of depth 712m, be lowered to the well cementation of D177.8mm production casing, and the cementing sealing is to 330m (cement paste returns and pushes up above 350m to coal seam).
Further, position along the coal seam downdip direction apart from above-mentioned straight well horizontal range 900m, bore second mouthful of straight well, as the near-end connected well (2) of first process well, this well casing programme is identical with above-mentioned first straight well, drills the following 30m completion in boundary at the bottom of coal seam.
Further, position at the coal seam downdip direction apart from above-mentioned second mouthful of straight well horizontal range 400m, bore first process well (1), and this well is multi-branched horizontal well, adopt three body structures that drive a well, one opens and uses the D311.2mm rock bit, after drilling bedrock weathering zone 20m, in well depth 60m finishing drilling, lower D244.5mm surface pipe, depth of setting 58m, the full sealing of cementing, sealing regolith, layer of gravel; Two exploitation D215.9mm rock bit, bore and reach well depth 627.50m, vertical depth 552.25m, and 86 ° of hole deviations, be lowered to the D177.8mm intermediate casing cementing, and cement returns to 200m; Three open by the D152.4mm rock bit and pierce coal seam, the master who bores the first process well at Nei Yan coal seam, coal seam updip direction props up (4), and the master of first process well props up (4) and successively is communicated with in coal seam with the near-end connected well (2) of first process well and the far-end connected well (3) of first process well.At the near-end connected well (2) of first process well and the master of the first process well between first process well far-end connected well (3), prop up on (4), bore 8 branches along the coal seam updip direction, each branch length 600m, and first process well master props up 30 ° of angles between (4), 8 distributions prop up the both sides of (4) the master of first process well, the adjacent sidetracking dot spacing of homonymy 200m, between the adjacent sidetracking dot spacing of heteropleural 100m.Above-mentioned bored first process well (1), the near-end connected well (2) of first process well have formed first multi-branched horizontal well well group with the far-end connected well (3) of first process well.
Further, according to the method described above, the far-end connected well using the near-end connected well of first process well as second mouthful of process well, bore second multi-branched horizontal well well group; Far-end connected well using the near-end connected well of second mouthful of process well as the 3rd mouthful of process well, bore the 3rd multi-branched horizontal well well group.
Above three multi-branched horizontal well well groups have formed a multi-lateral horizontal well system for coal bed gas that is applicable to monoclinal structure, wherein: first multi-branched horizontal well well group is by first process well (1), the near-end connected well (2) of first process well and the far-end connected well (3) of first process well form, second multi-branched horizontal well well group is by second mouthful of process well (9), the near-end connected well (10) of second mouthful of process well and the far-end connected well (2) of second mouthful of process well form, the 3rd multi-branched horizontal well well group is by the 3rd mouthful of process well (7), the near-end connected well (8) of the 3rd mouthful of process well and the far-end connected well (10) of the 3rd mouthful of process well form.
First process well (1) is 400m with the horizontal range of the near-end connected well (2) of first process well, and the near-end connected well (2) of first process well is 900m with the horizontal range of the far-end connected well (3) of first process well; Second mouthful of process well (9) is 1300m with the horizontal range of the near-end connected well (2) of first process well, the near-end connected well (10) of second mouthful of process well is 400m with the horizontal range of second mouthful of process well (9), the far-end connected well that the near-end connected well (2) of first process well is second mouthful of process well; The 3rd mouthful of process well (7) is 1300m with the horizontal range of the near-end connected well (10) of second mouthful of process well, the near-end connected well (8) of the 3rd mouthful of process well is 400m with the horizontal range of the 3rd mouthful of process well (7), the far-end connected well that the near-end connected well (10) of second mouthful of process well is the 3rd mouthful of process well (7); Connect successively according to three multi-branched horizontal well well groups of said sequence, formed a master and propped up the multi-lateral horizontal well system that horizontal section length is 2700m.Thereby efficiently solve in the cbm development of monoclinal structure, under existing drilling technology condition, between the near-end connected well (2) of first process well (1) and first process well, and the well section between the near-end connected well (10) of second mouthful of process well (9) and second mouthful of process well can't horizontal well drilling branch, cause the uncontrollable problem of this part resource; Simultaneously, in this system, a main horizontal section length is 2700m, is each multi-branched horizontal well master Zhi Changdu sum in system, thereby has improved Area of a well and gas output per well.
The near-end connected well (10) of the near-end connected well (2) of first process well, the far-end connected well (3) of first process well, second mouthful of process well, the near-end connected well (8) of the 3rd mouthful of process well are similar on the same straight line, and the master who props up (4), second mouthful of process well with the master of the first process well respectively master that props up (5), the 3rd mouthful of process well props up (6) and is connected.
In this system, there is a bite near-end connected well to adopt well as row, and it is the near-end connected well that is positioned at the minimum position of monoclinal structure, coal seam that row adopts well, the present embodiment is adopted well with the near-end connected well (8) of the 3rd mouthful of process well as row, and row adopts the water pumping gas production of well for this multi-lateral horizontal well system.Realized that a plurality of multi-branched horizontal well groups adopt well by row flatly and carry out water pumping gas production, that is: many wells are arranged altogether, have reduced row and have adopted well quantity, thereby reduced input and floor space that row adopts equipment.
The near-end connected well (10) of the near-end connected well (2) of first process well, the far-end connected well (3) of first process well, second mouthful of process well all can be used as monitor well, it all is positioned at the seam construction updip direction that row adopts well, and monitor well can be used for strata pressure observation and manufacturing process is monitored in real time.Realized carrying out the monitoring of segmentation real-time pressure by monitor well in the coal-bed gas exploitation process, can monitor in time between each monitor well and each monitor well is adopted the situation that is communicated with between well with row, be conducive to guarantee the even running that coal bed gas is produced.
Claims (4)
1. a multi-lateral horizontal well system for coal bed gas that is applicable to monoclinal structure, by two or more multi-branched horizontal well well groups, formed, it is characterized in that: each multi-branched horizontal well well group is by a bite process well, a bite near-end connected well, a bite far-end connected well forms, the far-end connected well of second multi-branched horizontal well well group is the near-end connected well of first multi-branched horizontal well well group, the far-end connected well of the 3rd multi-branched horizontal well well group is the near-end connected well of second multi-branched horizontal well well group, the 3rd later multi-branched horizontal well well group is cascaded successively according to said sequence, form a master and propped up the multi-lateral horizontal well system that horizontal section length is each multiple-limb technique well group master Zhi Changdu sum.
2. a kind of multi-lateral horizontal well system for coal bed gas that is applicable to monoclinal structure according to claim 1, it is characterized in that: all near-end connected well, far-end connected wells all are similar on the same straight line, and prop up and be connected with the master of each process well respectively.
3. a kind of multi-lateral horizontal well system for coal bed gas that is applicable to monoclinal structure according to claim 1 is characterized in that: have a bite near-end connected well to adopt well as row, and row to adopt well be the near-end connected well that is positioned at the minimum position of monoclinal structure, coal seam.
4. a kind of multi-lateral horizontal well system for coal bed gas that is applicable to monoclinal structure according to claim 1, it is characterized in that: row adopts all near-end connected wells beyond well and far-end connected well as monitor well, and monitor well is positioned at the monocline seam construction updip direction that row adopts well.
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| CN2013203060077U CN203334956U (en) | 2013-05-31 | 2013-05-31 | Multi-branch horizontal well system suitable for coalbed methane of uniclinal structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103867124A (en) * | 2013-05-31 | 2014-06-18 | 华北石油管理局 | CBM (Coal-Bed Methane) multi-branch horizontal well system suitable for uniclinal structure |
| CN108716396A (en) * | 2018-03-30 | 2018-10-30 | 兰州城市学院 | A kind of development approach of coal bed gas multiple-limb distal end connected well |
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2013
- 2013-05-31 CN CN2013203060077U patent/CN203334956U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103867124A (en) * | 2013-05-31 | 2014-06-18 | 华北石油管理局 | CBM (Coal-Bed Methane) multi-branch horizontal well system suitable for uniclinal structure |
| CN103867124B (en) * | 2013-05-31 | 2015-12-09 | 华北石油管理局 | A kind of multi-lateral horizontal well system for coal bed gas being applicable to monoclinal structure |
| CN108716396A (en) * | 2018-03-30 | 2018-10-30 | 兰州城市学院 | A kind of development approach of coal bed gas multiple-limb distal end connected well |
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Granted publication date: 20131211 Termination date: 20160531 |