CN104196453B - Coalbed methane development well - Google Patents

Coalbed methane development well Download PDF

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Publication number
CN104196453B
CN104196453B CN201410437180.XA CN201410437180A CN104196453B CN 104196453 B CN104196453 B CN 104196453B CN 201410437180 A CN201410437180 A CN 201410437180A CN 104196453 B CN104196453 B CN 104196453B
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China
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well
directional
horizontal
described
engineering
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CN201410437180.XA
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Chinese (zh)
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CN104196453A (en
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J·沃尔特
窦政辉
任光军
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富地柳林燃气有限公司
中联煤层气有限责任公司
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Abstract

The invention provides a coalbed methane development well. The coalbed methane development well comprises an engineering well, a first directional well, a second directional well, a first horizontal well and a second horizontal well, wherein the extension directions of the two directional wells are different, the separation distance between the wellhead of each directional well and the engineering well is 9 cm to 12 cm, the wellhead of the first directional well, the wellhead of the second directional well and the wellhead of the engineering well are all located in a same well field, the first directional well and the second directional well are communicated with the engineering well underground, the first horizontal well is communicated with the first directional well and the engineering well, and the second horizontal well is communicated with the second directional well and the engineering well. According to the coalbed methane development well, the repeated engineering of independent horizontal well drilling in multi-layer coal is reduced, land is saved, and cost is reduced.

Description

Cbm development well

Technical field

The present invention relates to coal-bed gas exploitation field is and in particular 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, Fracturing fracture is difficult to be controlled, it is many to take up an area, the shortcomings of steel thimble need to be played, destroy Seam Roof And Floor big is affected on colliery, gradually by level Well is replaced.

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 is remote, and horizontal well is beaten toward coal seam downdip direction, connects with mining straight well after being drilled horizontal segment again, and horizontal segment is general only There is one;The mining straight well of " pinniform " multi-branched horizontal well and engineering well distance are near, and horizontal well is beaten toward coal seam updip direction, first with Bore coal seam horizontal segment again after the connection of mining straight well, have multiple horizontal branch.The having high demands, in landform of " U " type horizontal well pair landform The bad region of condition, is difficult to extensive employing.In addition, this horizontal well only one of which horizontal branch, Area of a well is little, For developing the coal bed gas field of certain area, drilling well is more, thus overall drilling cost can be led to rise.

, typically by 1 mouthful of mining straight well and 1 mouthful of engineering well construction, two mouthfuls of well locations are in two differences for " pinniform " multi-branched horizontal well Well site, wellhead ground is apart from general 200~300m." pinniform " multi-branched horizontal well is due to being by positioned at the two of two different well sites Mouth well construction, and also have certain requirement to the distance and bearing in this two well sites, so the requirement to landform for this well type Also of a relatively high, in the bad region of orographic condition, it is difficult to extensive employing.

In sum, there is problems with prior art:It is difficult to, in the case that orographic condition is bad, arrange multiple-limb Horizontal well.

Content of the invention

The present invention provides a kind of cbm development well, is difficult in the case that orographic condition is bad to solve prior art, Setting multi-branched horizontal well.

For this reason, the present invention proposes a kind of cbm development well, described cbm development well includes:

One engineering well;

First directional well and the second directional well, bearing of trend difference, the well head of each directional well and the institute of two directional wells The spacing stating the well head of engineering well is 9m to 12m;

The well head of described first directional well, the well head of the second directional well are respectively positioned on same well site with the well head of described engineering well In, described first directional well and the second directional well respectively with described engineering well in subterranean communication;

First level well, is connected with described first directional well and described engineering well;

Second horizontal well, is connected with described second directional well and described engineering well.

Further, the size in described well site is less than or equal to 80 meters for length, and width is less than or equal to 50 meters.

Further, the well head of each directional well and the spacing of the well head of described engineering well are 10m.

Further, the horizontal displacement of each directional well is 280 to 300 meters.

Further, described first level well includes two horizontal segments, and two horizontal segments are respectively protruding into neighbouring coal Layer.

Further, each horizontal segment is respectively provided with multiple masters and props up.

Further, each horizontal segment described is respectively provided with three masters and props up, each main drilling depth 800-1000m, middle main Shang Daliangge branch, each branch drilling depth 400-500m, the spacing of each branch is 300m.

Further, the master of each horizontal segment described prop up with branch under enter the continuous plastics screen casing of diameter 50mm.

Further, the pressure release area of described first level well and the second horizontal well is not overlapping.

Further, the distance in described adjacent coal seam is 3 to 5 meters, and after described two horizontal segments are all drilled to, it is right just to start Any one horizontal segment mining blood pressure lowering.

The present invention is arranged in same well site using by the well head of two directional wells and an engineering well, from an engineering The well head of well is in two directional wells of subterranean communication, and the horizontal well by this engineering well two different directions of brill, and can lead to Cross the coal bed gas that two directional wells are exploited two horizontal wells.Because the well head of above-mentioned two directional well and an engineering well is equal It is arranged in same well site, so, overcome prior art and be difficult to, in the case that orographic condition is bad, arrange multiple-limb level The difficulty of well.The present invention reduces the repetition engineering of the independent horizontal well drilling of multilamellar coal, save soil, reduced cost.

And then, after the first level well of the present invention and the second horizontal well UNICOM directional well, each horizontal well can bore simultaneously Wear adjacent multilamellar coal (for example, two-layer coal), the resource of adjacent multilamellar coal can be developed simultaneously, substantially increase individual well down-hole The utilization rate of resource.

Brief description

Fig. 1 is the structural representation in the main view direction of cbm development well of the embodiment of the present invention;

Fig. 2 is the structural representation of the overlook direction of first level section of first level well of embodiments of the invention;

Fig. 3 is the structural representation of the overlook direction of the first level well of embodiments of the invention and the second horizontal well.

Drawing reference numeral explanation:

1 first directional well 2 second directional well, 3 engineering well, 4 first level well 5 second horizontal well 9 ground 10 first 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 directional well props up 32 engineering wells props up The master that the master of 41 horizontal segment, 42 horizontal segment, 51 horizontal segment, 52 horizontal segment 411 horizontal segment props up 412 horizontal segments props up 413 horizontal segments Master prop up

Specific embodiment

In order to be more clearly understood to the technical characteristic of the present invention, purpose and effect, now comparison brief description this Bright.

As shown in figure 1, the present invention is in same well site, the well head 30 of an engineering well and the well of two directional wells are set Mouth, the well head 10 of the respectively first directional well and the well head 20 of the second directional well, the well head of each directional well and described engineering well Well head spacing be 9m to 12m, for example, 10m, directional well be producing well, for exploiting coal bed methane.

With respect to engineering well, directional well and straight well all to use as mining well, also phase on bore and setting of casing With, difference be wellbore trajectory and with the distance of engineering well on, directional well is oblique, and straight well is straight, on ground 9, orientation Well head distance about 10m, straight well and the engineering well distance 200~300m of well and engineering well, 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 It is normally placed at two single well sites, if being placed on a well site, or land area is excessive, and expense is too high, or ground noodles Part does not allow for, or cannot levy so large-arealy.The present invention adopts the supporting setting of directional well and engineering well, can make Obtain directional well and engineering well in same well site, saved soil, reduced cost.

The present invention bores 2 mouthfuls of directional wells in a well site to different directions, and the horizontal displacement of each directional well is 280 to 300 Rice, is that engineering well has flowed out sufficient space with the connection of directional well, for example, the horizontal displacement of directional well is about 290m, engineering After roof landing, away from coal seam connectivity points about 100m, engineering well three is connected after opening well with the first directional well, connects into Start after work(to bore first level well 4.Detailed process is:In one layer of coal borer first level section 41, it is drilled the company of returning to after one layer of coal Before logical point, attempt carrying out 2 connections in another layer of coal, after connection success, bore the horizontal segment of this layer of coal, i.e. the second horizontal segment again 42.Each horizontal segment is respectively provided with multiple masters and props up, to realize larger control area.Using the present invention, first level section and second The distance of horizontal segment can closely reach 3 to 5 meters, or is 1 to 2 meter or 8 meters, 10 meters or more than 10 meters.Between exploitation two Away from the adjacent coal bed for 3 to 5 meters, it is possible to achieve the exploitation in two adjacent nearlyer coal seams, it is not subject to the pressure disturbances of adjacent coal bed, In addition production efficiency and resource utilization are also improved.

For example, as shown in Fig. 2 the horizontal segment of every layer of coal has three main, for example, first level section 41 has the master of horizontal segment 411, the master of horizontal segment prop up 412 and the master of horizontal segment prop up 413, each main drilling depth 800-1000m, middle main upper to make a call to two Subbranch, branch drilling depth 400-500m, the spacing of each branch is 300m, and each horizontal segment makes the control area of every layer of coal be about 0.9 square kilometre, the control gross area of two horizontal segments is about 1.8 square kilometres.After preventing horizontal hole coal seam from collapsing Blocking seepage channel, enters the continuous plastics screen casing of diameter 50mm under horizontal segment.

After being drilled first level well 4, in engineering well inclination section cementing plug, cut off at sizing collar, extract sleeve pipe, then The engineering well inclination section of sidetracking the second horizontal well 5, landing, setting of casing, three opens and carries out connecting with the second directional well and according to The process of one two horizontal segments of Horizontal Well Drilling, bores the horizontal segment 51 of two-layer coal and the horizontal segment 52 of the second horizontal well 5, finally enters down Screen casing, completion.In order to simply embody the integrally-built relation of cbm development well, only illustrate engineering well in Fig. 1 and determine To the relation of well, it is shown without engineering well and the handshaking procedures of two horizontal wells.

Only have three well heads, the respectively well of the well head of two directional wells and an engineering well so on a well site Mouthful.Engineering well props up two directional wells of connection by the master of two different engineering wells, and each directional well connects a horizontal well, this Just there are 2 horizontal wells in each well site of sample.Each horizontal well has two horizontal segments, and two horizontal segments form and arrange up and down.So, one In individual well site, two horizontal well drilling depth 16000m altogether, 2 × 1.8=3.6 square kilometre of two horizontal well control areas.So, Using the cbm development well of the present invention, one is the resource that can simultaneously develop adjacent multilamellar coal, substantially increases individual well down-hole The utilization rate of resource;The two repetition engineerings being the reduction of the independent horizontal well drilling of multilamellar coal, have saved soil, have reduced cost;Three It is multilamellar coal is developed simultaneously, it is to avoid the interference that one layer of pressure drop causing of independent exploitation is developed to adjacent coal bed.

Further, the size in described well site is less than or equal to 80 meters for length, and width is less than or equal to 50 meters.I.e. the present invention adopts With an engineering well drilling well site, multiple coal seams of above-mentioned area can be controlled, substantially increase the utilization of individual well down-hole resource Rate.

Further, Fig. 3 is the first level well of embodiments of the invention and the overlook direction projection knot of the second horizontal well Structure schematic diagram, such as Fig. 3, the pressure release area of described first level well 4 and the second horizontal well 5 is not overlapping, in other words, first level well Not overlapping with the floor projection of the second horizontal well, to ensure not interact between first level well and the second horizontal well.

Using the present invention, the distance of first level section and the second horizontal segment can closely reach 3 to 5 meters, described two horizontal segments After being all drilled to, just start to any one horizontal segment mining blood pressure lowering.In other words, the adjacent coal that two spacing are 3 to 5 meters can be exploited Layer, can fully realize the exploitation in the nearlyer coal seam of adjacent two, improve production efficiency.

And two coal seams of prior art exploitation are first to build a horizontal well to be exploited, after having exploited this coal seam, exploitation is another Outer one layer of coal just needs to bore a bite horizontal well (section) again, is then exploited again.During drilling well, the pressure in coal seam is the original pressure on stratum Power, the exploitation of coal bed gas needs coal seam is carried out drainage and step-down, and so methane in coal seam for the absorption just can discharge in desorbing, Mining for a period of time after, the pressure in coal seam will be more much lower than original formation pressure, and also can be to the ground near mining coal seam Layer produces pressure drop impact, will be in the coal seam horizontal well drilling near mining coal seam if at this moment, and the pressure in bored coal seam will Ratio is relatively low, will increase the mud leakage in drilling process, lead to the generation of complex accident.So, prior art exploits two There is problem of pressure drop in adjacent coal bed, lead to second layer coal close together can not exploit.

The present invention, for the exploitation of adjacent coal bed, just bores the horizontal well (section) of two-layer coal, shape before mining blood pressure lowering Exploited again after becoming two horizontal segments, the phenomenon of previous mining impact posterior horizontal segment drilling will not be produced, so The problems referred to above would not be produced.

The foregoing is only the schematic specific embodiment of the present invention, be not limited to the scope of the present invention.For this Each ingredient of invention can be mutually combined under conditions of not conflicting, any those skilled in the art, without departing from this Done equivalent variations and modification on the premise of the design of invention and principle, all should belong to the scope of protection of the invention.

Claims (5)

1. a kind of cbm development well is it is characterised in that described cbm development well includes:
One engineering well;
First directional well and the second directional well, bearing of trend difference, the well head of each directional well and the described work of two directional wells The spacing of the well head of Cheng Jing is 9m to 12m;
The well head of described first directional well, the well head of the second directional well are respectively positioned in same well site with the well head of described engineering well, Described first directional well and the second directional well respectively with described engineering well in subterranean communication;
First level well, is connected with described first directional well and described engineering well;
Second horizontal well, is connected with described second directional well and described engineering well;
Described first level well includes two horizontal segments, and two horizontal segments are respectively protruding into neighbouring coal seam;
Each horizontal segment is respectively provided with three masters and props up, each main drilling depth 800-1000m, middle Zhu Zhi Shang Daliangge branch, each Branch drilling depth 400-500m, the spacing of each branch is 300m;
The master of each horizontal segment prop up with branch under enter the continuous plastics screen casing of diameter 50mm;
The size in described well site is less than or equal to 80 meters for length, and width is less than or equal to 50 meters.
2. cbm development well as claimed in claim 1 is it is characterised in that the well head of each directional well and described engineering well The spacing of well head is 10m.
3. cbm development well as claimed in claim 1 is it is characterised in that the horizontal displacement of each directional well is 280 to 300 Rice.
4. cbm development well as claimed in claim 1 is it is characterised in that the letting out of described first level well and the second horizontal well Pressure surface amasss not overlapping.
5. cbm development well as claimed in claim 1 it is characterised in that described adjacent coal seam distance be 3 to 5 meters, After described two horizontal segments are all drilled to, just start to any one horizontal segment mining blood pressure lowering.
CN201410437180.XA 2014-08-29 2014-08-29 Coalbed methane development well CN104196453B (en)

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CN104790915B (en) * 2015-04-22 2017-04-26 西南石油大学 Coal bed methane recovery method
CN104912479B (en) * 2015-04-30 2017-01-11 中煤科工集团西安研究院有限公司 Method for drilling and completion of horizontal branched well for coal bed gas
CN109577919A (en) * 2017-09-28 2019-04-05 中国石油天然气股份有限公司 The recovery method of coal bed gas in low permeability coal seam

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US8297377B2 (en) * 1998-11-20 2012-10-30 Vitruvian Exploration, Llc Method and system for accessing subterranean deposits from the surface and tools therefor
CN201236690Y (en) * 2008-07-04 2009-05-13 兴和鹏能源技术(北京)有限公司 Multi-branch horizontal well
CN102116140B (en) * 2011-01-25 2012-01-18 煤炭科学研究总院西安研究院 Construction method for enhancing extraction effect of ground coal bed gas
CN203335054U (en) * 2013-05-31 2013-12-11 华北石油管理局 Multi-branch horizontal well system suitable for coalbed methane of syncline structure

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CN204024473U (en) * 2014-08-29 2014-12-17 富地柳林燃气有限公司 Cbm development well

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