CN202031479U - Coal seam gas branch well - Google Patents
Coal seam gas branch well Download PDFInfo
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- CN202031479U CN202031479U CN2011201053366U CN201120105336U CN202031479U CN 202031479 U CN202031479 U CN 202031479U CN 2011201053366 U CN2011201053366 U CN 2011201053366U CN 201120105336 U CN201120105336 U CN 201120105336U CN 202031479 U CN202031479 U CN 202031479U
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- 239000003245 coal Substances 0.000 title claims abstract description 80
- 238000005553 drilling Methods 0.000 abstract description 17
- 230000006378 damage Effects 0.000 abstract description 3
- 230000003247 decreasing effect Effects 0.000 abstract 3
- 239000002002 slurry Substances 0.000 abstract 1
- 239000012530 fluid Substances 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000003449 preventive effect Effects 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 235000016936 Dendrocalamus strictus Nutrition 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model provides a coal seam gas branch well which comprises an engineering well provided with a landing point, and a communication well intersecting the engineering well and provided with a communication point; and the horizontal distance between the landing point and the communication point is greater than or equal to 15 meters and less than or equal to 25 meters. The coal seam gas branch well has the advantages that the exposure length of a coal seam section is decreased, and the risk of collapse is decreased; a borehole and a borehole wall at a throat section are protected by adopting temporary plugging slurry, so that the damage to the shape of the throat section can be reduced, and the danger of collapse of the borehole at the throat section is decreased; and a sidetrack drilling point is arranged to provide convenience for sidetrack drilling in the later period.
Description
Technical field
The utility model relates to coal bed gas drilling technology field, in particular to a kind of coal bed gas Multilateral Wells.
Background technology
Along with China's coal bed gas enters the business development stage, in order to pursue high benefit, the developer begins to drill increasing horizontal branch well.The individual well total footage reaches more than 4000 meters, have in addition reach more than 8000 meters, the individual well drillng operation time reached more than 60 days.The coal seam exposed area increases like this, and well yield also can obtain than leap ahead, but the venturi well safety problem of coal bed gas Multilateral Wells can become a restriction drilling well key of success factor.
As shown in Figure 1, the well track 10 of engineering well Z is deep in the coal seam 20, the venturi well claims the engineering well again, be meant the well section that drilling tool is come in and gone out repeatedly in drillng operation, for from the some B about 300 meters well section CD after the connectivity points C of connected well L that lands, the indication multi-branched horizontal well has in the plane but is not limited to different shape.
Conventional coal bed gas multi-branched horizontal well venturi well section drilling mode is down:
See that the coal seam lands, use 6 then " or 4.75 " the inch drill bit gets into connectivity points C from the some B that lands, after the connectivity points usually well track 10 walk at 20 middle parts in the coal seam.From land some B to connectivity points C apart from BC usually greater than 100 meters, there is potential safety hazard in such drilling mode because the coal seam exposes morely, the some B that lands also often has an accident behind the connectivity points C to mostly occurring collapse accident between the connectivity points C.
The factor that above-mentioned drilling mode influences venturi well safety mainly contains the following aspects:
The point that lands is longer to the length of exposure of coal seam section between the connectivity points, and weak spot is many.
Venturi well coal seam section open-assembly time in drilling fluid is long, and coal body is soft, collapses.
The venturi well is because the discrepancy repeatedly of drilling tool, the washing away repeatedly of drilling fluid, and the venturi shape is destroyed, can't re-use.
Venturi well position in the coal seam is lower, when accident such as collapsing, is unfavorable for utilizing again the venturi well.
Owing to there are not preventive action, when outside the venturi well, security incident taking place, be not easy to take the sidetracking measure in the venturi well, cause full well to be scrapped.
The utility model content
The utility model provides a kind of coal bed gas Multilateral Wells, to address the above problem.
For this reason, the utility model proposes a kind of coal bed gas Multilateral Wells, described coal bed gas Multilateral Wells comprises: engineering well, described engineering well have the landing point; With the connected well that described engineering well intersects, described connected well has connectivity points, the horizontal range between described landing point and the described connectivity points more than or equal to 15 meters smaller or equal to 25 meters.
Further, the horizontal range between described landing point and the described connectivity points more than or equal to 19 meters smaller or equal to 21 meters.
Further, when top, coal seam was fine coal, described connectivity points was located at 1 meter, bottom, coal seam, and sleeve pipe is down to 1 meter, bottom, coal seam.
Further, when the bottom, coal seam was fine coal, described connectivity points was located at 1 meter, top, coal seam, and sleeve pipe is down to 1 meter, top, coal seam.
Further, the borehole wall of venturi well is provided with the protection mud layer.
Further, be provided with side tracking point in the venturi well.
Further, be provided with 3 to 7 side tracking points in the venturi well.
Further, the venturi well is provided with 5 side tracking points altogether, is provided with 1 every 50 meters in the venturi well.
Coal bed gas Multilateral Wells of the present utility model, the horizontal range between point and the described connectivity points of landing more than or equal to 15 meters smaller or equal to 25 meters, being far smaller than between existing landing point and the described connectivity points is distance more than 100 meters, reduced the length that the coal seam exposes, reduce the point that lands to the danger of collapsing between the connectivity points, increased safety factor.
In addition, the venturi well adopts protection mud that the borehole wall is protected, and has reduced in the drilling process the destruction of the borehole wall, has reduced the danger that the venturi well collapses, and has increased safety.
And then, be provided with side tracking point in the venturi well, be beneficial to the later stage sidetracking, when outside the venturi well, security incident taking place, can utilize side tracking point to take the sidetracking measure in the venturi well, can utilize the venturi well again, avoid full well to scrap.
Description of drawings
Fig. 1 is the structural representation of existing coal bed gas Multilateral Wells;
Fig. 2 is the structural representation according to the coal bed gas Multilateral Wells of the utility model first embodiment;
Fig. 3 is the structural representation according to the coal bed gas Multilateral Wells of the utility model second embodiment;
Fig. 4 is the structural representation according to the venturi well of the utility model first embodiment;
Fig. 5 is the structure for amplifying schematic diagram at A place among Fig. 4.
The drawing reference numeral explanation:
10, engineering well well track 15, engineering well well track 20, coal seam B, landing point
B1, the some B2 that lands, land some C, connectivity points C1, connectivity points C2, connectivity points
E, side tracking point Z, engineering well L, connected well
The specific embodiment
Understand for technical characterictic of the present utility model, purpose and effect being had more clearly, now contrast the description of drawings specific embodiment of the present utility model.
As shown in Figures 2 and 3, comprise according to the coal bed gas Multilateral Wells of the utility model embodiment: engineering well Z, described engineering well Z has the landing point, is the some B1 that lands among Fig. 2, is the some B2 that lands among Fig. 3; With the crossing connected well L of described engineering well Z, described connection L well has connectivity points C1 or C2, horizontal range B1C1 between described landing point and the described connectivity points or B2C2 more than or equal to 15 meters smaller or equal to 25 meters, being far smaller than between existing landing point and the described connectivity points is distance more than 100 meters, reduced the length that the coal seam exposes, reduce the danger of collapsing, increased safety factor.Further, horizontal range between described landing point and the described connectivity points more than or equal to 19 meters smaller or equal to 21 meters, for example be 20 meters, under the prerequisite that guarantees the appropriate distance between landing point and the described connectivity points, further reduced the length that the coal seam exposes, reduced the point that lands to the danger of collapsing between the connectivity points.
Further, as shown in Figure 2, when 20 bottoms, coal seam were fine coal, described connectivity points was located at 1 meter, top, coal seam, and sleeve pipe is down to 1 meter, top, coal seam.Further, as shown in Figure 3, when 20 tops, coal seam were fine coal, described connectivity points C1 was located at 1 meter, bottom, coal seam, and sleeve pipe is down to 1 meter, bottom, coal seam.Land point apart from 20 meters of connectivity points positions, and sleeve pipe is down to top, coal seam or 1 meter of bottom, and connectivity points also is located at 1 meter of top, coal seam or bottom, and promptly connectivity points apart from 1 meter of top, coal seam or bottom, is communicated with reentry coal seam, back at vertical direction.To from top, coal seam or the selection that is communicated with of bottom, mainly consider the laminarity of inside, coal seam.As top, coal seam is fine coal, then is communicated with from the bottom; As the bottom, coal seam is fine coal, then is communicated with from top.Usually the coal bed gas multi-branched horizontal well adopts the elevation angle to creep into, and such design can not sacrificed too many coal seam drilling depth.Like this, reduce the length of exposure of coal seam section, replace sleeve pipe, reduced the danger of collapsing.
Further, the borehole wall of venturi well is provided with the protection mud layer.As shown in Figure 2, the borehole wall of venturi well C1D adopts temporarily stifled mud that the borehole wall is protected, and for the probing of venturi well, bans use of clear water to creep into, and adopts the macromolecule clay-free drilling fluid and add colloid, and this section passage is formed good retaining wall.The length in this section space is for being communicated with back 300 meters.Like this, can reduce venturi well coal seam section open-assembly time in drilling fluid, reduce washing away repeatedly of drilling fluid, alleviate the destruction of venturi shape, reduce the danger that the venturi well collapses.
Further, be provided with side tracking point in the venturi well.Can collapse in drilling process at any time in the coal seam, will withdraw dangerous well section rapidly after collapsing, and gets back to 300 meters escape pit section of venturi well and carry out sidetracking.Existing creeping into owing to there are not preventive action when outside the venturi well security incident taking place, is not easy to take the sidetracking measure in the venturi well, causes full well to be scrapped.The utility model will be reserved the side tracking point of some after connection, for example be provided with 3 to 7 side tracking points.As shown in Figure 4 and Figure 5, venturi well C1D is provided with 5 side tracking point E altogether, is specially per 50 meters points, is in the high-order bit, coal seam as far as possible, is beneficial to the later stage sidetracking.Like this, can utilize side tracking point to take the sidetracking measure, can utilize the venturi well again, avoid full well to scrap in the venturi well.
The above only is the schematic specific embodiment of the utility model, is not in order to limit scope of the present utility model.For each ingredient of the present utility model can make up under the condition of not conflicting mutually; any those skilled in the art; equivalent variations of having done under the prerequisite that does not break away from design of the present utility model and principle and modification all should belong to the scope that the utility model is protected.
Claims (8)
1. coal bed gas Multilateral Wells, described coal bed gas Multilateral Wells comprises: engineering well, described engineering well have the point of landing and venturi well; With the connected well that described engineering well intersects, described connected well has connectivity points, it is characterized in that, the horizontal range between described landing point and the described connectivity points more than or equal to 15 meters smaller or equal to 25 meters.
2. coal bed gas Multilateral Wells as claimed in claim 1 is characterized in that, the horizontal range between described landing point and the described connectivity points more than or equal to 19 meters smaller or equal to 21 meters.
3. coal bed gas Multilateral Wells as claimed in claim 1 is characterized in that, when top, coal seam was fine coal, described connectivity points was located at 1 meter, bottom, coal seam, and sleeve pipe is down to 1 meter, bottom, coal seam.
4. coal bed gas Multilateral Wells as claimed in claim 1 is characterized in that, when the bottom, coal seam was fine coal, described connectivity points was located at 1 meter, top, coal seam, and sleeve pipe is down to 1 meter, top, coal seam.
5. coal bed gas Multilateral Wells as claimed in claim 1 is characterized in that the borehole wall of venturi well is provided with the protection mud layer.
6. coal bed gas Multilateral Wells as claimed in claim 1 is characterized in that, is provided with side tracking point in the venturi well.
7. coal bed gas Multilateral Wells as claimed in claim 6 is characterized in that, is provided with 3 to 7 side tracking points in the venturi well.
8. coal bed gas Multilateral Wells as claimed in claim 7 is characterized in that, the venturi well is provided with 5 side tracking points altogether, is provided with 1 every 50 meters in the venturi well.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201053366U CN202031479U (en) | 2011-04-12 | 2011-04-12 | Coal seam gas branch well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201053366U CN202031479U (en) | 2011-04-12 | 2011-04-12 | Coal seam gas branch well |
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| Publication Number | Publication Date |
|---|---|
| CN202031479U true CN202031479U (en) | 2011-11-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201053366U Expired - Lifetime CN202031479U (en) | 2011-04-12 | 2011-04-12 | Coal seam gas branch well |
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| CN (1) | CN202031479U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103485713A (en) * | 2012-06-13 | 2014-01-01 | 南风化工集团股份有限公司 | Method for correcting position of target point in communicated well drilling process |
| CN103510853A (en) * | 2013-10-17 | 2014-01-15 | 中国石油集团渤海钻探工程有限公司 | Comprehensive guiding method of coal-bed gas horizontal well |
| CN109025952A (en) * | 2018-10-29 | 2018-12-18 | 中国神华能源股份有限公司 | Horizontal well and its construction method |
-
2011
- 2011-04-12 CN CN2011201053366U patent/CN202031479U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103485713A (en) * | 2012-06-13 | 2014-01-01 | 南风化工集团股份有限公司 | Method for correcting position of target point in communicated well drilling process |
| CN103485713B (en) * | 2012-06-13 | 2016-01-06 | 南风化工集团股份有限公司 | The method of correction target point position in a kind of UNICOM well drilling process |
| CN103510853A (en) * | 2013-10-17 | 2014-01-15 | 中国石油集团渤海钻探工程有限公司 | Comprehensive guiding method of coal-bed gas horizontal well |
| CN103510853B (en) * | 2013-10-17 | 2015-09-16 | 中国石油集团渤海钻探工程有限公司 | A kind of coal bed gas horizontal well integrated guidance method |
| CN109025952A (en) * | 2018-10-29 | 2018-12-18 | 中国神华能源股份有限公司 | Horizontal well and its construction method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 100082 Beijing City, Haidian District Xizhimen North Street B maples International Center, No. 32 room 1609 Patentee after: Peng Xing and Energy Technology (Beijing) Co., Ltd. Address before: 100082 Beijing City, Haidian District Xizhimen North Street B maples International Center, No. 32 room 1609 Patentee before: Peng Xing and Energy Technology (Beijing) Co., Ltd. |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20111109 |