CN204024473U - Cbm development well - Google Patents

Cbm development well Download PDF

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Publication number
CN204024473U
CN204024473U CN201420497155.6U CN201420497155U CN204024473U CN 204024473 U CN204024473 U CN 204024473U CN 201420497155 U CN201420497155 U CN 201420497155U CN 204024473 U CN204024473 U CN 204024473U
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well
horizontal
directional
engineering
head
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CN201420497155.6U
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于晓宇
董华荣
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FUDI LIULIN GAS Co Ltd
China United Coalbed Methane Co Ltd
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FUDI LIULIN GAS Co Ltd
China United Coalbed Methane Co Ltd
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Abstract

The utility model provides a kind of cbm development well, and described cbm development well comprises: an engineering well; First directional well and the second directional well, the bearing of trend of two directional wells is different, and the spacing of the well head of each directional well and the well head of described engineering well is 9m to 12m; The well head of the well head of described first directional well, the well head of the second directional well and described engineering well is all arranged in same well site, described first directional well and the second directional well respectively with described engineering well at subterranean communication; First horizontal well, is communicated with described engineering well with described first directional well; Second horizontal well, is communicated with described engineering well with described second directional well.The utility model decreases the repetition engineering of the independent horizontal well drilling of multilayer coal, has saved soil, has reduced cost.

Description

Cbm development well
Technical field
The utility model relates to coal-bed gas exploitation field, is specifically related to a kind of cbm development well.
Background technology
Existing cbm development well type is generally pressure break straight well and horizontal well.Pressure break straight well because Area of a well is little, the difficult control of fracturing fracture, take up an area many, steel sleeve need be played, destroy Seam Roof And Floor the shortcomings such as large affected on colliery, gradually replace by horizontal well.
Horizontal well is generally divided into " U " type horizontal well and " pinniform " multi-branched horizontal well.The mining straight well of " U " type horizontal well and engineering well distance, horizontal well is beaten toward coal seam downdip direction, is communicated with after having bored horizontal segment with mining straight well again, and horizontal segment generally only has one; Closely, horizontal well is beaten toward coal seam updip direction, bores coal seam horizontal segment again, have multiple horizontal branch after being first communicated with mining straight well for the mining straight well of " pinniform " multi-branched horizontal well and engineering well distance.The requirement of " U " type horizontal well to landform is high, in the region that orographic condition is bad, is difficult to extensive employing.In addition, this horizontal well only has a horizontal branch, and Area of a well is little, and for the coal bed gas field of the certain area of exploitation, drilling well is more, thus overall drilling cost can be caused to rise.
" pinniform " multi-branched horizontal well is generally made up of 1 mouthful of mining straight well and 1 mouthful of engineering well, and two mouthfuls of well locations are in two different well sites, and wellhead ground is apart from general 200 ~ 300m." pinniform " multi-branched horizontal well is owing to being by the two mouthfuls of well constructions being positioned at two different well sites, and also have certain requirement to the distance and bearing in these two well sites, so this well type is also relatively high to the requirement of landform, in the region that orographic condition is bad, be difficult to extensive employing.
In sum, in prior art, there is following problem: be difficult to, when orographic condition is bad, arrange multi-branched horizontal well.
Utility model content
The utility model provides a kind of cbm development well, is difficult to, when orographic condition is bad, arrange multi-branched horizontal well to solve prior art.
For this reason, the utility model proposes a kind of cbm development well, described cbm development well comprises:
An engineering well;
First directional well and the second directional well, the bearing of trend of two directional wells is different, and the spacing of the well head of each directional well and the well head of described engineering well is 9m to 12m;
The well head of the well head of described first directional well, the well head of the second directional well and described engineering well is all arranged in same well site, described first directional well and the second directional well respectively with described engineering well at subterranean communication;
First horizontal well, is communicated with described engineering well with described first directional well;
Second horizontal well, is communicated with described engineering well with described second directional well.
Further, described well site is of a size of length and is less than or equal to 80 meters, and width is less than or equal to 50 meters.
Further, the spacing of the well head of each directional well and the well head of described engineering well is 10m.
Further, the horizontal movement of each directional well is 280 to 300 meters.
Further, described first horizontal well comprises two horizontal segments, and two horizontal segments stretch into neighbouring coal seam respectively.
Further, each horizontal segment all has multiple master and props up.
Further, described each horizontal segment is respectively provided with three masters and props up, and each master props up drilling depth 800-1000m, middle Zhu Zhi Shang Daliangge branch, each branch drilling depth 400-500m, and the spacing of each branch is 300m.
Further, the master of described each horizontal segment prop up with branch under enter the continuous plastics screen casing of diameter 50mm.
Further, the pressure release area of described first horizontal well and the second horizontal well is not overlapping.
Further, the distance in described adjacent coal seam is 3 to 5 meters, after described two horizontal segments are all drilled to, just starts any one horizontal segment mining step-down.
The utility model adopts and is all arranged in same well site by the well head of two directional wells and an engineering well, from the well head of an engineering well at subterranean communication two directional wells, and bored the horizontal well of two different directions by this project well, and the coal bed gas of exploitation two horizontal wells can be able to by two directional wells.Because the well head of above-mentioned two directional wells and an engineering well is all arranged in same well site, so, overcome prior art and be difficult to, when orographic condition is bad, arrange the difficulty of multi-branched horizontal well.The utility model decreases the repetition engineering of the independent horizontal well drilling of multilayer coal, has saved soil, has reduced cost.
And then, after first horizontal well of the present utility model and the second horizontal well UNICOM directional well, each horizontal well can drill adjacent multilayer coal (being such as two-layer coal) simultaneously, can develop the resource of adjacent multilayer coal simultaneously, substantially increase the utilization rate of individual well down-hole resource.
Accompanying drawing explanation
Fig. 1 is the structural representation of the main apparent direction of the cbm development well of the utility model embodiment;
Fig. 2 is the structural representation overlooking direction of the first horizontal segment of the first horizontal well of embodiment of the present utility model;
Fig. 3 is the first horizontal well of embodiment of the present utility model and the structural representation overlooking direction of the second horizontal well.
Drawing reference numeral illustrates:
The master that the master that the master that the master that the master of well head 31 engineering well of well head 30 engineering well of well head 20 second directional well of 1 first directional well 2 second directional well 3 engineering well 4 first horizontal well 5 second horizontal well 9 ground 10 first directional well props up 32 engineering wells props up 41 horizontal segment 42 horizontal segment 51 horizontal segment 52 horizontal segment 411 horizontal segments props up 412 horizontal segments props up 413 horizontal segments props up
Detailed description of the invention
In order to there be understanding clearly to technical characteristic of the present utility model, object and effect, now contrast accompanying drawing and the utility model is described.
As shown in Figure 1, the utility model is in same well site, the well head 30 of an engineering well and the well head of two directional wells are set, be respectively the well head 10 of the first directional well and the well head 20 of the second directional well, the spacing of the well head of each directional well and the well head of described engineering well is 9m to 12m, be such as 10m, directional well is producing well, for exploiting coal bed methane.
Relative to engineering well, directional well and straight well all use as mining well, also identical on bore with setting of casing, difference is at wellbore trajectory with in the distance of engineering well, directional well is oblique, straight well is straight, on ground 9, the well head distance about 10m of directional well and engineering well, straight well and engineering well distance 200 ~ 300m, engineering well drilling well site area is generally 50 × 80m, mining straight well well site area is generally 30 × 30m, due to engineering well and mining straight well distance 200 ~ 300m, so be usually placed on two independent well sites, be placed on the words in a well site, or land area is excessive, expense is too high, or ground condition does not just allow, or cannot levy so large-arealy.The utility model adopts the supporting setting of directional well and engineering well, can make directional well and engineering well in same well site, save soil, reduced cost.
The utility model bores 2 mouthfuls of directional wells in a well site to different directions, the horizontal movement of each directional well is 280 to 300 meters, for engineering well has flowed out sufficient space with being communicated with of directional well, such as, the horizontal movement of directional well is about 290m, and engineering well, after roof lands, is about 100m apart from coal seam connectivity points, engineering well three is communicated with the first directional well after opening, and is communicated with successfully and starts to bore the first horizontal well 4.Detailed process is: at one deck coal borer first horizontal segment 41, before returning to connectivity points after having bored one deck coal, attempts carrying out 2 times and is communicated with, be communicated with the horizontal segment boring this one deck coal successfully again, i.e. the second horizontal segment 42 at another layer of coal.Each horizontal segment all has multiple master and props up, to realize larger control area.Adopt the utility model, the distance of the first horizontal segment and the second horizontal segment closely can reach 3 to 5 meters, or is 1 to 2 meter, also can be 8 meters, more than 10 meters or 10 meters.Exploiting two spacing is the adjacent coal bed of 3 to 5 meters, can realize the exploitation in two adjacent nearlyer coal seams, not by the pressure disturbances of adjacent coal bed, also improves production efficiency and resource utilization in addition.
Such as, as shown in Figure 2, the horizontal segment of every layer of coal has three main, such as, the master that the first horizontal segment 41 has a horizontal segment props up 411, the master of horizontal segment prop up 412 and the master of horizontal segment prop up 413, each master props up drilling depth 800-1000m, above make a call to two subbranches, branch drilling depth 400-500m for middle main, the spacing of each branch is 300m, each horizontal segment makes the control area of every layer of coal be about 0.9 square kilometre, and the control gross area of two horizontal segments is about 1.8 square kilometres.Blocking seepage channel after collapsing to prevent horizontal hole coal seam, under horizontal segment, entering the continuous plastics screen casing of diameter 50mm.
After having bored the first horizontal well 4, at engineering well inclination section cementing plug, cut off at sizing collar place, extract sleeve pipe, then the engineering well inclination section of sidetracking second horizontal well 5, landing, setting of casing, three are opened, carry out being communicated with the second directional well and according to the process of the first Horizontal Well Drilling two horizontal segments, bore horizontal segment 51 and the horizontal segment 52 of the two-layer coal of the second horizontal well 5, finally enter screen casing, completion down.In order to simply embody the integrally-built relation of cbm development well, in Fig. 1, only illustrate the relation of engineering well and directional well, the handshaking procedures of engineering well and two horizontal wells is not shown.
On a well site, only have three well heads like this, be respectively the well head of two directional wells and the well head of an engineering well.Engineering well props up connection two directional wells by the master of two different engineering wells, and each directional well connects a horizontal well, and just there are 2 horizontal wells in each like this well site.Each horizontal well has two horizontal segments, and two horizontal segments are formed and arrange up and down.Like this, in a well site, two horizontal well drilling depth 16000m altogether, two horizontal well control area 2 × 1.8=3.6 square kilometre.So adopt cbm development well of the present utility model, one is the resource can developing adjacent multilayer coal, substantially increases the utilization rate of individual well down-hole resource simultaneously; The two repetition engineerings being the reduction of the independent horizontal well drilling of multilayer coal, have saved soil, have reduced cost; Three is that multilayer coal is developed simultaneously, avoids the interference that Pressure Drop that separately exploitation one deck causes is developed adjacent coal bed.
Further, described well site is of a size of length and is less than or equal to 80 meters, and width is less than or equal to 50 meters.Namely the utility model adopts an engineering well drilling well site, can control multiple coal seams of above-mentioned area, substantially increase the utilization rate of individual well down-hole resource.
Further, Fig. 3 be the first horizontal well of embodiment of the present utility model and the second horizontal well overlook direction projection structural representation, as Fig. 3, the pressure release area of described first horizontal well 4 and the second horizontal well 5 is not overlapping, in other words, the horizontal projection of the first horizontal well and the second horizontal well is not overlapping, to ensure not interact between the first horizontal well and the second horizontal well.
Adopt the utility model, the distance of the first horizontal segment and the second horizontal segment closely can reach 3 to 5 meters, after described two horizontal segments are all drilled to, just starts any one horizontal segment mining step-down.In other words, can exploit two spacing is the adjacent coal bed of 3 to 5 meters, fully can realize the exploitation in two adjacent nearlyer coal seams, improve production efficiency.
And prior art to exploit two coal seams be first build a horizontal well to exploit, after having exploited this coal seam, exploit other one deck coal and just need bore water horizontal well (section) again, and then exploit.During drilling well, the pressure in coal seam is the reset pressure on stratum, the exploitation of coal bed gas needs to carry out drainage and step-down to coal seam, the methane be adsorbed on like this in coal seam just can discharge in desorb, after mining a period of time, the pressure in coal seam will be more much lower than original formation pressure, and also can produce pressure drop impact to the stratum near mining coal seam, if at this moment will coal seam drilling horizontal well near mining coal seam, bore the pressure in coal seam will be lower, the lose returns in drilling process will be increased the weight of, cause the generation of complex accident.So prior art is exploited two adjacent coal bed and be there is problem of pressure drop, the second layer coal of close together is caused not exploit.
The utility model is for the exploitation of adjacent coal bed, just the horizontal well of two-layer coal (section) is all bored before mining step-down, form two horizontal segments to exploit, can not produce previous mining affects the phenomenon that posterior horizontal segment creeps into, so would not produce the problems referred to above later again.
The foregoing is only the schematic detailed description of the invention of the utility model, and be not used to limit scope of the present utility model.For each ingredient of the present utility model can mutually combine under the condition of not conflicting; any those skilled in the art; equivalent variations done under the prerequisite not departing from design of the present utility model and principle and amendment, all should belong to the scope of the utility model protection.

Claims (9)

1. a cbm development well, is characterized in that, described cbm development well comprises:
An engineering well;
First directional well and the second directional well, the bearing of trend of two directional wells is different, and the spacing of the well head of each directional well and the well head of described engineering well is 9m to 12m;
The well head of the well head of described first directional well, the well head of the second directional well and described engineering well is all arranged in same well site, described first directional well and the second directional well respectively with described engineering well at subterranean communication;
First horizontal well, is communicated with described engineering well with described first directional well;
Second horizontal well, is communicated with described engineering well with described second directional well.
2. cbm development well as claimed in claim 1, it is characterized in that, described well site is of a size of length and is less than or equal to 80 meters, and width is less than or equal to 50 meters.
3. cbm development well as claimed in claim 1, it is characterized in that, the spacing of the well head of each directional well and the well head of described engineering well is 10m.
4. cbm development well as claimed in claim 1, it is characterized in that, the horizontal movement of each directional well is 280 to 300 meters.
5. cbm development well as claimed in claim 1, it is characterized in that, described first horizontal well comprises two horizontal segments, and two horizontal segments stretch into neighbouring coal seam respectively.
6. cbm development well as claimed in claim 5, it is characterized in that, each horizontal segment all has multiple master and props up.
7. cbm development well as claimed in claim 6, it is characterized in that, each horizontal segment is respectively provided with three masters and props up, and each master props up drilling depth 800-1000m, middle Zhu Zhi Shang Daliangge branch, each branch drilling depth 400-500m, and the spacing of each branch is 300m.
8. cbm development well as claimed in claim 7, is characterized in that, the master of each horizontal segment prop up with branch under enter the continuous plastics screen casing of diameter 50mm.
9. cbm development well as claimed in claim 1, it is characterized in that, the pressure release area of described first horizontal well and the second horizontal well is not overlapping.
CN201420497155.6U 2014-08-29 2014-08-29 Cbm development well Active CN204024473U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104196453A (en) * 2014-08-29 2014-12-10 富地柳林燃气有限公司 Coalbed methane development well
CN106677746A (en) * 2017-01-05 2017-05-17 中国神华能源股份有限公司 Method for coal bed gas exploitation of full working face through down-hole system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104196453A (en) * 2014-08-29 2014-12-10 富地柳林燃气有限公司 Coalbed methane development well
CN104196453B (en) * 2014-08-29 2017-02-15 富地柳林燃气有限公司 Coalbed methane development well
CN106677746A (en) * 2017-01-05 2017-05-17 中国神华能源股份有限公司 Method for coal bed gas exploitation of full working face through down-hole system

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