CN201786346U - Coal bed gas multibranch horizontal well - Google Patents
Coal bed gas multibranch horizontal well Download PDFInfo
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- CN201786346U CN201786346U CN201020543008XU CN201020543008U CN201786346U CN 201786346 U CN201786346 U CN 201786346U CN 201020543008X U CN201020543008X U CN 201020543008XU CN 201020543008 U CN201020543008 U CN 201020543008U CN 201786346 U CN201786346 U CN 201786346U
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Abstract
The utility model discloses a coal bed gas multibranch horizontal well, which is used in cooperation with a straight well, the coal bed gas is provided with a communicating cave; the multibranch horizontal well comprises: a straight well section, a whipstock section, and a horizontal section, the horizontal section comprises: a horizontal borehole, which is connected with the communicating cave, and extends for a predetermined distance along the extension direction of the whipstock section from the communicating cave; two groups of branch boreholes are respectively provided with a plurality of branch boreholes, each branch borehole respectively comprises: a lateral section, which transversely extends to a side at an included angle of Theta1 relative to the extension direction of the horizontal borehole, lateral direction sections in branch boreholes are successively in an end-to-end connection; and a forward section, which is connected with the corresponding lateral section, and extends forward at an included angle of Theta2 relative to the extension direction of the horizontal borehole; Theta 2 is smaller than Theta1. The multibranch horizontal well makes two adjacent boreholes fully separate in a short distance, and increases source control area of drilling footage to the maximum.
Description
Technical field
The utility model relates to the coal-bed gas exploitation field, especially relates to a kind of coal bed gas multi-branched horizontal well.
Background technology
In the existing coal bed gas multi-branched horizontal well engineering, a multi-branched horizontal well and the corresponding straight well that is communicated with are an engineering.Multi-branched horizontal well generally includes and is parallel to straight well and extends the straight well section downwards, obliquely from the lower end of straight well section extends to the inclination section in the connection cave of straight well down, from being communicated with the cave along the horizontal segment that extends preset distance away from the direction of inclination section.The arrangement of horizontal well horizontal segment has direct relation in the productive area of coal bed gas and exploitation effect and the coal seam.In traditional design, the horizontal well horizontal segment generally includes a main borehole, and is connected the branch on the main borehole.Usually according to the area or the coal seam section drilling depth of operator's demand, carry out branch design and spread, the both sides with branch is evenly distributed on this main borehole are similar to leaf and are distributed in the vein both sides; Usually branch and main borehole angular difference increase progressively in the scope of 35-45 degree, evenly distribute about 100 meters at adjacent sidetracking dot spacing on the main borehole.
All branches all are connected on the main borehole in the above-mentioned this horizontal well structure, need wait until after last branch well hole drilling well is finished and just can carry out the exploitation of coal bed gas, in this process,, cause well destroyed or complicated easily because drilling tool removes and rotates in this section well for a long time.So-called complexity be meant drilling tool in the down-hole the normal situation of drilling well.In case the appearance complexity may cause whole section horizontal well can't continue construction and the front has been drilled to main borehole and branch well hole blocks, and the waste lot of manpower and material resources.Simultaneously, all branches all are arranged on the main borehole in this horizontal well structure, arranging between branch well hole and the main borehole is too intensive, and this makes drilling depth on the main borehole just be used as the passage of draining decompression, and fails to realize the effect of the coal bed gas extraction of drilling depth on the main borehole.
In order to improve the deficiency of above-mentioned horizontal well structure, a kind of multi-branched horizontal well structure has as shown in fig. 1 obtained paying close attention to widely, as shown in Figure 1, this multi-branched horizontal well comprise straight well section 110 ', inclination section 130 ', horizontal segment 150 ' and the straight well 200 that is used with multi-branched horizontal well ', the connection cave 210 of straight well 200 ' be provided with '.In this multi-branched horizontal well structure, two main boreholes 151 of horizontal segment 150 ' comprise ' and be connected to the branch well hole 153 in two main borehole 151 ' outsides '.Such design, improve the horizontal well that includes only a main borehole and caused the destroyed or complicated situation of well easily, also improved to a certain extent simultaneously and arranged too intensively between branch well hole and the main borehole, made drilling depth on the main borehole just be used as the deficiency of the passage of draining decompression.
Yet, in multi-branched horizontal well as shown in Figure 1, from branch well hole 153 ' with main borehole 151 ' the outward extending very long segment distance of tie point in, branch well hole 153 ' with a lot of drilling depth close proximity of main borehole 151 ' have, this makes well track densely distributed, drilling depth on the main borehole is still contributed seldom for drainage and step-down and coal bed gas extraction, has caused the waste of a lot of drilling depths, and the control area of the unit's of making drilling depth obviously reduces.Shown in the connection diagram of branch well hole and main borehole in Fig. 1 multi-branched horizontal well among Fig. 2, branch well hole and main borehole are at distance side tracking point 139m place among the figure, distance between two wells is 33m only, in this scope, can satisfy the needs of development of resources fully with a well, and cause two wells that connect so not bring into play exploitative effect fully, but because still will there be two wells in the needs of technology.When the multi-branched horizontal well structure of using as shown in Figure 1, the multi-branched horizontal well that drilling depth amount is 4000m calculates according to 7 sidetrackings, the drilling depth of nearly 1000m can't be played a role fully, and this part drilling depth accounts for 25% of total footage, makes development efficiency be subjected to very big influence.Simultaneously, because it is far apart from straight well to be connected the branch of main borehole far-end, somewhere on the main borehole is stopped up the part of causing if collapse in the coal seam, and the drilling depth of the Duan Yiyuan that results in blockage can't continue to produce, need drifting transformation again, otherwise can cause a lot of drilling depths no longer to contribute production capacity.
The utility model content
The utility model purpose is to provide a kind of coal bed gas multi-branched horizontal well, the drilling depth amount of branch well hole and main borehole close proximity that overcome in the prior art in the horizontal segment of horizontal well is bigger, seem that well track is densely distributed, drilling depth on the main borehole has reached the contribution of extraction effect seldom for drainage and step-down, caused the waste of a lot of drilling depths, the control area of the unit's of making drilling depth obviously reduces, low deficiency under the development efficiency.
For this reason, the utility model provides a kind of coal bed gas multi-branched horizontal well, is used with straight well, and straight well is provided with and is communicated with the cave; Multi-branched horizontal well comprises: the straight well section is parallel to straight well and extends downwards; Inclination section, the oblique connection cave that extends to straight well down from the lower end of straight well section; And horizontal segment,, horizontal segment comprises: horizontal hole is connected with the connection cave, from being communicated with the bearing of trend extension preset distance of cave along inclination section; Two group of branches wells, be connected to the both sides of horizontal hole, respectively be provided with many branch well holes in the two group of branches wells, each branch well hole comprises respectively: lateral sections, to a side horizontal expansion, each lateral sections joins end to end the bearing of trend of horizontal hole successively in each branch well hole with angle theta 1 relatively; The forward direction section is connected with corresponding lateral sections, and the bearing of trend of horizontal hole extends forward with angle theta 2 relatively; θ 2＜θ 1.
Further, 45 °≤θ is 1＜90 °.
Further, 50 °≤θ is 1＜60 °.
Further, in same group in each branch well hole the angle θ 2 between each forward direction section and the lateral sections increase gradually from inside to outside.
Further, the length of horizontal hole is not less than 5m.
Further, the length of horizontal hole is not more than 150m.
Further, the distance of two group of branches wells between the side tracking point on the horizontal hole is not less than 10m.
Further, the distance between adjacent two forward direction sections is during greater than 100 meters, between adjacent two corresponding branch well holes of forward direction section, also be provided with one in the middle of well, the distance between middle well and the both sides adjacent wellbores all is not less than 50m.
Further, middle well is connected near on the branch well hole of horizontal hole one side, and the lateral sections and the forward direction section that are connected this branch well hole are turned round on the position in orientation.
Advantage of the present utility model: in all branches, the weakened notion of main borehole of the utility model coal bed gas multi-branched horizontal well, each branch all turns round after the lateral sections of position sidetracking in orientation relatively from previous branch, and the bearing of trend of horizontal hole extends forward with angle theta 2, by such design, two well tracks are fully separated in very short distance, can as much as possible improve the resource control area of unit drilling depth.Simultaneously, the notion of main borehole owing to weakened in this multi-branched horizontal well, the common segment between each branch well hole is extremely short, collapses the part of causing when stopping up when the coal seam occurs in distance straight well position far away, because the drilling depth of actual blockage is less, and can be not too much influence production capacity.Even the part obstruction of collapsing and cause in the coal seam occurs in common segment,, also relatively easily carry out the drifting transformation because this common segment is nearer apart from straight well.
Except purpose described above, feature and advantage, the utility model also has other purpose, feature and advantage.With reference to figure, the utility model is described in further detail below.
Description of drawings
Accompanying drawing constitute this manual a part, be used for further understanding the utility model, accompanying drawing shows preferred embodiment of the present utility model, and is used for illustrating principle of the present utility model with manual.Among the figure:
Fig. 1 shows the structural representation of a kind of common coal bed gas multi-branched horizontal well in the prior art;
Fig. 2 shows among Fig. 1 the connection diagram of branch well hole and main borehole in the coal bed gas multi-branched horizontal well;
Fig. 3 shows a kind of structural representation of the utility model coal bed gas multi-branched horizontal well embodiment;
Fig. 4 shows the another kind of structural representation of the utility model coal bed gas multi-branched horizontal well embodiment; And
Fig. 5 shows among Fig. 3 the connection diagram between two branch well holes.
The specific embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is elaborated, embodiment in the utility model and accompanying drawing only are in order to help to understand the utility model.The multitude of different ways that the utility model can be defined by the claims and cover is implemented.
As shown in Figure 3, in first kind of specific embodiment of the utility model coal bed gas multi-branched horizontal well, this multi-branched horizontal well and straight well 200 are used, and which is provided with to be communicated with cave 210; Multi-branched horizontal well comprises: be parallel to straight well sections 110 that straight well 200 extends downwards, oblique inclination section 130 and the horizontal segment 150 that extends to the connection cave 210 of straight well 200 down from the lower end of straight well section 110.In the utility model, horizontal segment 150 comprises: the horizontal hole 151 that is connected with connection cave 210, and the two group of branches wells 153 that are connected to described horizontal hole 151 both sides, horizontal hole 151 is from being communicated with the bearing of trend extension preset distance of cave 210 along described inclination section; Extending in the utility model only is that direction to the well of horizontal well is done a regulation, this well on this bearing of trend, according to the tendency in coal seam can be suitable rising, degradation change down.Respectively be provided with many branch well holes 153 in the two group of branches wells 153, each branch well hole 153 comprises that respectively the bearing of trend of relative horizontal hole 151 is with the lateral sections 155 of angle theta 1 to a side horizontal expansion, and be connected, and the bearing of trend of the horizontal hole forward direction section 157 of extending forward relatively with angle theta 2 with corresponding lateral sections 155.Each lateral sections 155 joins end to end successively in each branch well hole 153; Wherein θ 2＜θ 1.In the utility model multi-branched horizontal well, in the horizontal segment between each contiguous branch well 153 all by one section lateral sections 155, the bearing of trend of lateral sections 155 relative horizontal holes 151 with angle theta 1 to a side horizontal expansion, so just, can separate two adjacent branch well holes 153 fast, as shown in Figure 4, among Fig. 4 be the connection diagram of two continuous branch well holes 153 among Fig. 3.As can be seen, in short distance, two adjacent branch well holes 153 just can separate the scope of broad, and the control area of the unit's of making drilling depth is obviously promoted.
Preferably, the bearing of trend of lateral sections 155 relative horizontal holes 151 with angle theta 1 to a side horizontal expansion, 1＜90 ° of wherein said 45 °≤θ.Angle is too for a short time not to reach fast the separately purpose of two contiguous branch wells 153, and angle is too big, and existing drilling tool can't be realized.More preferably, 1＜60 ° of 50 °≤θ in this scope, can either separate two adjacent branch well holes 153 fast, simultaneously, can realize that the distributed architecture of multi-branched horizontal well horizontal segment 150 is more reasonable.
In addition, in the utility model in same group of multi-branched horizontal well eye group in each branch well hole 153 the angle θ 2 between each forward direction section 157 and the lateral sections 155 increase gradually from inside to outside.Such arrangement mode can enlarge the area coverage according to the utility model multi-branched horizontal well, and the control area that more helps the unit drilling depth gets a promotion.
In the utility model, preferably the length of horizontal hole 151 is set to be not less than 5m.In the multi-branched horizontal well drilling process, need be supported to drilling tool and be carried out sidetracking, the too for a short time support that is unfavorable for drilling tool of the length of horizontal hole 151 causes the sidetracking weak effect easily, even the sidetracking failure.Simultaneously the length of horizontal hole 151 is too little, and drill string vibration can destroy the borehole wall at connectivity points place during sidetracking, complex situations such as cause probably to collapse in this position.More preferably, the length of horizontal hole 151 is not more than 150m.The length of horizontal hole 151 is long, makes the distance of the branch well hole section 153 that mainly plays drainage and step-down and coal bed gas extraction in the horizontal segment 150 shorten, and has so just wasted a large amount of usefull spaces.Wherein, the distance of two group of branches wells 153 between the side tracking point on the horizontal hole 151 is not less than 10m.Certainly many-sided cooperations such as deflecting ability of the hole deviation by side tracking point, regularity of coal seam, power drilling tool, boring two second main boreholes in less than the distance of 10m also can be successful, but such process wastes time and energy, and the situation of failure appears easily.
As shown in Figure 5, in second kind of specific embodiment of the utility model coal bed gas multi-branched horizontal well, distance between adjacent two forward direction sections 157 is during greater than 100 meters, well 159 also be provided with one between adjacent two forward direction sections, 157 corresponding branch well holes in the middle of, the distance between middle well 159 and the both sides adjacent wellbores all is not less than 50m.Arranging like this can be more reasonable, effectively target coal seam is carried out step-down draining and coal bed gas extraction, neither can make adjacent branch well hole too intensive, can not stay white space because the distance between the contiguous branch well is excessive again.Need to prove, what provide in Fig. 5 is a kind of special situation, middle well 159 just in time is positioned on the extension line of horizontal hole 151, this centre well 159 is not limited to this in the utility model, in the unshowned in the drawings scheme, this branch well hole can be connected between two adjacent arbitrarily forward direction sections 157.Wherein, preferably middle well 159 is connected, and the lateral sections 155 that is connected this branch well hole 153 is turned round on the position in orientation with forward direction section 157 near on the branch well hole 153 of horizontal hole 151 1 sides.So more meet the utility model with adjacent two original intentions that well is separated fast, improve the control area of unit drilling depth.
In all branches, the weakened notion of main borehole of the utility model coal bed gas multi-branched horizontal well, each branch all turns round after the lateral sections of position sidetracking in orientation relatively from previous branch, and the bearing of trend of horizontal hole extends forward with angle theta 2, by such design, two well tracks are fully separated in very short distance, can as much as possible improve the resource control area of unit drilling depth.Simultaneously, the notion of main borehole owing to weakened in this multi-branched horizontal well, the common segment between each branch well hole is extremely short, the part obstruction of collapsing and cause in the coal seam occurs in distance straight well position far away, because the drilling depth of actual blockage is less, and can be not too much influence production capacity.Even the part obstruction of collapsing and cause in the coal seam occurs in common segment,, also relatively easily carry out the drifting transformation because this common segment is nearer apart from straight well.
Coal bed gas multi-branched horizontal well provided by the utility model is not only applicable to the exploitation of coal bed gas, is applicable to the geology mineral reserve that other uses the exploitation of drainage and step-down method simultaneously yet.
Be preferred embodiment of the present utility model only below, be not limited to the utility model, for a person skilled in the art, the utility model can have various changes and variation.All within spirit of the present utility model and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection domain of the present utility model.
Claims (9)
1. a coal bed gas multi-branched horizontal well is used with straight well (200), and described straight well (200) is provided with and is communicated with cave (210); Described multi-branched horizontal well comprises:
Straight well section (110) is parallel to described straight well (200) and extends downwards;
Inclination section (130), the oblique connection cave (210) that extends to described straight well down from the lower end of described straight well section;
Horizontal segment (150),
It is characterized in that described horizontal segment (150) comprising:
Horizontal hole (151) is connected with described connection cave (210), extends preset distance from described connection cave (210) along the direction away from described inclination section;
Two group of branches wells (153) are connected to the both sides of described horizontal hole (151), respectively are provided with many branch well holes (153) in two groups of described branch well holes (153), and each described branch well hole (153) comprises respectively:
To a side horizontal expansion, each lateral sections (155) joins end to end successively in each described branch well hole (153) with angle theta 1 for lateral sections (155), the bearing of trend of described relatively horizontal hole (151);
Forward direction section (157) be connected with corresponding described lateral sections (155), and the bearing of trend of described relatively horizontal hole is extended forward with angle theta 2;
Described θ 2＜θ 1.
2. horizontal well according to claim 1 is characterized in that, 1＜90 ° of described 45 °≤θ.
3. horizontal well according to claim 2 is characterized in that, 1＜60 ° of described 50 °≤θ.
4. according to each described horizontal well of claim 1-3, it is characterized in that, in same group in each described branch well hole the angle θ 2 between each described forward direction section and the described lateral sections increase gradually from inside to outside.
5. horizontal well according to claim 4 is characterized in that, the length of described horizontal hole (151) is not less than 5m.
6. horizontal well according to claim 5 is characterized in that, the length of described horizontal hole (151) is not more than 150m.
7. according to claim 5 or 6 described horizontal wells, it is characterized in that the distance of two groups of described branch well holes (153) between the side tracking point on the described horizontal hole (151) is not less than 10m.
8. horizontal well according to claim 7, it is characterized in that, distance between adjacent two forward direction sections (157) is during greater than 100 meters, well (159) in the middle of also being provided with one between the corresponding branch well hole of described adjacent two forward direction sections (157), the distance between described middle well (159) and the both sides adjacent wellbores all is not less than 50m.
9. horizontal well according to claim 8, it is characterized in that, well (159) is connected near on the branch well hole (153) of horizontal hole (151) one sides in the middle of described, and the lateral sections (155) that is connected this branch well hole (153) is turned round on the position in orientation with forward direction section (157).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020543008XU CN201786346U (en) | 2010-09-26 | 2010-09-26 | Coal bed gas multibranch horizontal well |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201020543008XU CN201786346U (en) | 2010-09-26 | 2010-09-26 | Coal bed gas multibranch horizontal well |
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| CN201786346U true CN201786346U (en) | 2011-04-06 |
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| CN201020543008XU Expired - Lifetime CN201786346U (en) | 2010-09-26 | 2010-09-26 | Coal bed gas multibranch horizontal well |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101975056A (en) * | 2010-09-26 | 2011-02-16 | 北京奥瑞安能源技术开发有限公司 | Coal-bed gas multi-branch horizontal well and construction method thereof |
| CN104727811A (en) * | 2013-12-23 | 2015-06-24 | 中国石油化工股份有限公司 | Productivity prediction method of fishbone horizontal well segmented coupling |
-
2010
- 2010-09-26 CN CN201020543008XU patent/CN201786346U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101975056A (en) * | 2010-09-26 | 2011-02-16 | 北京奥瑞安能源技术开发有限公司 | Coal-bed gas multi-branch horizontal well and construction method thereof |
| CN104727811A (en) * | 2013-12-23 | 2015-06-24 | 中国石油化工股份有限公司 | Productivity prediction method of fishbone horizontal well segmented coupling |
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Granted publication date: 20110406 |