CN104453833A - Multi-branch horizontal well system and construction method thereof - Google Patents
Multi-branch horizontal well system and construction method thereof Download PDFInfo
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- CN104453833A CN104453833A CN201410602147.8A CN201410602147A CN104453833A CN 104453833 A CN104453833 A CN 104453833A CN 201410602147 A CN201410602147 A CN 201410602147A CN 104453833 A CN104453833 A CN 104453833A
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- 238000010276 construction Methods 0.000 title claims abstract description 31
- 239000012466 permeate Substances 0.000 claims description 7
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 12
- 238000004891 communication Methods 0.000 abstract description 4
- 238000003795 desorption Methods 0.000 abstract 1
- 238000005065 mining Methods 0.000 description 31
- 239000008398 formation water Substances 0.000 description 16
- 239000003245 coal Substances 0.000 description 14
- 238000005553 drilling Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 241000209094 Oryza Species 0.000 description 5
- 235000007164 Oryza sativa Nutrition 0.000 description 5
- 230000008595 infiltration Effects 0.000 description 5
- 238000001764 infiltration Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 235000009566 rice Nutrition 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 4
- 230000005484 gravity Effects 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000011161 development Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
- 230000003204 osmotic effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
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Abstract
The invention provides a multi-branch horizontal well system and a construction method thereof. The multi-branch horizontal well system is arranged in a tilted stratum and comprises at least two multi-branch horizontal wells. Each multi-branch horizontal well comprises a straight well section, a communication straight well and a main hole. Each communication straight well is located at the position lower than the corresponding straight well section. The main holes are connected between the straight well sections and the communication straight wells. The main holes in the two adjacent multi-branch horizontal wells are connected through water circulation of branch holes. Water in the tilted stratum can be drained and extracted effectively through the layout that the at least two multi-branch horizontal wells are arranged in the tilted stratum and the main holes are connected through water circulation of the branch holes, and the purpose of depressurization desorption is achieved.
Description
Technical field
The present invention relates to coal bed gas field, in particular to a kind of multi-lateral horizontal well system and construction method thereof.
Background technology
From the eighties in last century, along with the development of the technology such as measurement while-drilling instrument, motor and PDC drill bit, horizontal well drilling technology starts sizable application.By directional well technology straight well or inclined shaft bent target approach stratum and parallel object layer creeps into certain length, due to stratum be generally level or close to level so well in destination layer is also level or close to level, usually such well is called horizontal well.Horizontal well can be divided into single horizontal well and multi-branched horizontal well by well type; Single horizontal well can be divided into again tradition single horizontal well and be communicated with horizontal well with U-shaped; Multi-branched horizontal well has can be divided into single main multi-branched horizontal well and a two main multiple-limb level, completes order has to be divided into subdrilling branch or main of subdrilling in main split.
Coal bed gas extraction process is the process of draining, step-down, desorb and gas production.The mining of coal bed gas makes coal bed gas desorb by effective draining, reduction bottom pressure, is pooled to the process that low pressure pit shaft is discharged, usually uses multi-branched horizontal well to complete this mining process.Coal bed gas extraction process is draining, step-down, desorb, gas production, and first joint draining just determines coal bed gas horizontal well mining pump down to horizontal well minimum point, must be only had this some ability effectively draining, thus realize step-down, desorb and gas production.This just proposes requirement to horizontal well, multi-branched horizontal well drilling engineering: all branch well holes must greater than or equal to mining pump position, and the optimum position entered under mining pump is the connectivity points of landing point or the U-shaped well of near-end/far-end.That is: U-shaped well, multi-branched horizontal well are communicated with for horizontal well, near-end, must ensure to creep into along incline direction in acline or tilted stratum, arrange; For the U-shaped horizontal well of far-end, must ensure to creep at acline or along the direction, stratum that has a down dip, arrange.Do guarantee so under gravity, formation water flows to mining pump position (horizontal well extreme lower position), effectively could implement the mining of coal bed gas.
Multi-branched horizontal well can more effective communication coal seam self hole fissure channel, (oil) gas area is let out in increase, Branch control aerogenesis resource area efficiency is high, can overcome " hypotonic, low pressure, low saturated " feature of coal seam reservoirs well.So multi-branched horizontal well is subject to increasing attention and utilization in cbm development.But horizontal well and multi-branched horizontal well are mainly applicable to the exploitation of thin layer and low permeability reservoir.But inclination angle is greater than to the mining of the coal bed gas in 20 ° of inclination bottoms, the contradiction existed between mining difficulty and difficulty of construction because its physical features is higher, therefore the coal seam water in tilted stratum effectively can not be discharged always.
Prior art is when the problem of mining step-down in tilted stratum, still adopt the pattern of traditional multi-branched horizontal well, although during mining, utilize the gravity of current can obtain a good drainage effect, but the problem of this technology is when spudding in multi-branched horizontal well, hold due to tilted stratum and reduce suspending weight, under frictional resistance, backing pressure effect, limiting horizontal well and be drilled with length in tilted stratum.Length and the magnitude of inclination of frictional resistance and backing pressure and horizontal well are directly proportional, the stability of excessive drilling parameter (the pressure of the drill, suspending weight, moment of torsion etc.) destructible well is applied in order to overcome frictional resistance and backing pressure, in mechanical strength weakness easily collapses the coal seam that collapses, particularly especially easily cause the generation of borehole collapse lock of tool drilling, lead to serious loss.
Based on the problems referred to above, be necessary to propose a kind of effective multi-lateral horizontal well system, to solve the problem of coal seam water mining step-down difficulty in tilted stratum.
Summary of the invention
The present invention aims to provide a kind of multi-lateral horizontal well system and construction method thereof, to solve the coal bed gas drainage and step-down problem in tilted stratum.
To achieve these goals, according to an aspect of the present invention, provide a kind of multi-lateral horizontal well system, multi-lateral horizontal well system is arranged in tilted stratum, multi-lateral horizontal well system comprises at least two multi-branched horizontal wells, and each multi-branched horizontal well comprises respectively: straight well section; Be communicated with straight well, be positioned on the position of physical features lower than straight well section; Main borehole, is connected to straight well section and is communicated with between straight well; In adjacent two multi-branched horizontal wells, main borehole is connected by branch well hole current are logical.
Further, the first end being arranged on the branch well hole between adjacent two main boreholes is directly communicated with a main borehole, and the second end departs from horizontal direction and is directly communicated with to downward-extension with another main borehole or permeates and be communicated with.
Further, when the second end and another main borehole of branch well hole permeate and be communicated with, the second end of branch well hole is 3 ~ 15 meters apart from the distance of another main borehole.
Further, be provided with multiple branch well hole between adjacent two main boreholes, each branch well hole to stretch out formation by same a bite main borehole.
Further, be provided with multiple branch well hole between adjacent two main boreholes, adjacent two branch well holes are stretched out by different main boreholes and are formed.
Further, the horizontal projection length of branch well hole is 100 ~ 500 meters.
Further, each multi-branched horizontal well main borehole along with downdip direction angle be-90 °≤direction of α≤90 ° extends.
Further, the main borehole of each multi-branched horizontal well be arranged in parallel.
Further, every two adjacent multi-branched horizontal wells are one group, and two multi-branched horizontal wells being arranged in a group share a straight well section.
According to a further aspect in the invention, provide a kind of construction method of multi-lateral horizontal well system, at least two multi-branched horizontal wells are drilled through in tilted stratum, and the connection straight well of each multiple-limb level is arranged on the position of physical features lower than straight well section, and make to be connected by branch's current are logical between main borehole in adjacent two multi-branched horizontal wells.
Further, construction method comprises the following steps:
S1, be drilled with one group of spaced straight well, and one group is positioned at straight well downdip direction at tilted stratum, and arranges with straight well one_to_one corresponding and be communicated with straight well;
S2, get a straight well and drill through last multi-branched horizontal well as straight well section, the main borehole of last multi-branched horizontal well is wherein drilled through towards corresponding connection straight well, according to the spacing between adjacent two straight wells, along departing from the one-sided of horizontal direction or both sides drill through branched branch well hole downwards successively on the main borehole of last multi-branched horizontal well;
S3, get the straight well adjacent with the straight well of last multi-branched horizontal well as straight well section, the main borehole of a rear multi-branched horizontal well is wherein drilled through towards corresponding connection straight well, the main borehole of a rear multi-branched horizontal well and the main borehole of last multi-branched horizontal well are connected by the branch well hole current of last multi-branched horizontal well are logical, and depart from the one-sided of horizontal direction on the main borehole edge of a rear multi-branched horizontal well or both sides drill through branch well hole downwards successively;
S4, repeats step S3, to being covered with tilted stratum.
Further, construction method comprises the following steps:
S1, be drilled with one group of spaced straight well, and one group is positioned at straight well downdip direction at tilted stratum, and arranges with straight well one_to_one corresponding and be communicated with straight well;
S2, drills through the main borehole of multi-branched horizontal well respectively using each straight well as straight well section, straight well section is connected with corresponding connection straight well;
S3, complete each all multi-branched horizontal wells main borehole drill through work after, each multi-branched horizontal well main borehole drills through branched branch well hole downwards successively along the one or both sides of departing from horizontal direction; Main borehole in adjacent two multi-branched horizontal wells is connected by branch well hole current are logical.
Further, two adjacent multi-branched horizontal wells are one group, and in one group, two multi-branched horizontal wells are drilled through by a straight well section.
Apply a kind of multi-lateral horizontal well system of technical scheme of the present invention and construction method thereof, by at least two multi-branched horizontal wells are arranged in tilted stratum, and utilize branch well hole that main borehole current are led to connected layout, can water effectively in mining tilted stratum, reach the object that step-down is resolved.This multi-lateral horizontal well system in use, by the effect of mining pump and gravity, separate out and enter main borehole, enter branch subsequently from point well main borehole from stratum by the water in tilted stratum, and formation water is by the extremely adjacent main borehole of affluent-dividing.Following formation water repeats above-mentioned step, arrives another main borehole, considerably increase displacement by branch, until got rid of by formation water to greatest extent, reaches the object that step-down is resolved.
Accompanying drawing explanation
The Figure of description forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 shows the multi-lateral horizontal well system schematic diagram according to embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing of embodiment of the present invention, be described in detail, it should be noted that the technical scheme in embodiments of the invention, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
Introduce as background technology part, existing in prior art in tilted stratum can not the problem of drainage and step-down effectively.In order to address this problem, inventor provides a kind of multi-lateral horizontal well system.As shown in Figure 1, this multi-lateral horizontal well system is arranged in tilted stratum, multi-lateral horizontal well system comprises at least two multi-branched horizontal wells, each multi-branched horizontal well comprises respectively: straight well section 3, connection straight well 4, main borehole 2, wherein being communicated with straight well 4 is positioned on the position of physical features lower than straight well section 3, main borehole 2 is connected to straight well section 3 and is communicated with between straight well 4, and in adjacent two multi-branched horizontal wells, main borehole 2 is connected by branch well hole 1 current are logical.
The multi-lateral horizontal well system that the present invention is above-mentioned, by at least two multi-branched horizontal wells are arranged in tilted stratum, and utilize branch well hole 1 that main borehole 2 current are led to connected layout, can water effectively in mining tilted stratum, reach the object that step-down is resolved.This multi-lateral horizontal well system in use, by the effect of mining pump and gravity, separate out and enter main borehole 2, enter branch subsequently from point well main borehole 2 from stratum by the water in tilted stratum, and formation water is by the extremely adjacent main borehole 2 of affluent-dividing.Following formation water repeats above-mentioned step, arrives another main borehole 2, considerably increase displacement by branch, until got rid of by formation water to greatest extent, reaches the object that step-down is resolved.
One is embodiment preferably, and the first end being arranged on the branch well hole 1 between adjacent two main boreholes 2 is directly communicated with a main borehole 2, and the second end departs from horizontal direction and is directly communicated with to downward-extension with another main borehole 2 or permeates and be communicated with.By above-mentioned annexation, formation water can more efficiently from stratum by mining out, reach step-down object.One end of branch well hole 1 and main borehole 2 are communicated with and are beneficial to formation water and directly enter branch, and when in formation water, pressure is larger, the mode that branch's other end is connected with adjacent main well 2 can be taked, for mining step-down provides favourable layout, and when in formation water during moderate pressure, branch's other end can be taked to permeate with adjacent main well 2 mode be communicated with, not only can reach the effect that normal step-down is resolved, also eliminate the expense of the later maintenance to unnecessary branch well hole 1.
Preferably, when the second end and another main borehole 2 of branch well hole 1 permeate and be communicated with, the second end of branch well hole 1 is 3-15 rice apart from the distance of another main borehole 2.Be 3-15 rice by the distance that the second end distance of branch well hole 1 is set to another main borehole 2, while the normal step-down of guarantee is resolved, can ensure that branch is communicated with the infiltration of adjacent main well 2.When the distance that second end distance of branch well hole 1 is set to another main borehole 2 is greater than 3-15 rice, formation water osmotic effect can be relatively poor, be unfavorable for the mining step-down of formation water, and when this distance is less than 3-15 rice, then can face infiltration and be communicated with the possibility becoming connection, add the maintenance cost in later stage.
More preferably, be provided with multiple branch well hole 1 between adjacent two main boreholes 2, each branch well hole 1 to stretch out formation by same a bite main borehole 2.The setting of multiple branch well hole 1 adds the contact area on horizontal well and stratum, is not only beneficial to the drainage and step-down in Different Strata, can also increase gas production, and branch well hole 1 is positioned at constructability on same a bite main borehole 2 simultaneously, reduces construction cost.
Another kind of preferred embodiment, be provided with multiple branch well hole 1 between adjacent two main boreholes 2, adjacent two branch well holes 1 are stretched out by different main boreholes 2 and are formed.The setting of same multiple branch well hole 1 adds the contact area on horizontal well and stratum, not only be beneficial to the drainage and step-down in Different Strata, gas production can also be increased simultaneously, branch well hole 1 is stretched out by different main boreholes 2, is conducive to balancing the displacement in each main borehole 2 and the dredge oil amount in later stage, reduces the maintenance cost of main borehole 2.
In a preferred embodiment, the horizontal projection length of branch well hole 1 is 100-500 rice.This kind of layout can make adjacent two multi-branched horizontal wells play maximum drainage and step-down effect and ensure that the infiltration of branch well hole 1 connects and can not be destroyed simultaneously.When the horizontal projection distance of branch well hole 1 is less than 100 meters, mean the main borehole 2 of two adjacent multi-branched horizontal wells from very close to, to not only reduce like this and the contact area on stratum also add pressure disturbance between two adjacent main wells 2 simultaneously, improve the risk that main borehole 2 subsides.And when the horizontal projection distance of branch well hole 1 is greater than 500 meters, the main borehole 2 of two adjacent multi-branched horizontal wells from away from, cause in branch, touching end water speed comparatively large, improve the risk destroyed branch well hole 1 and be communicated with the infiltration that adjacent main props up well.
Preferably, each multi-branched horizontal well main borehole 2 along with downdip direction angle be-90 °≤direction of α≤90 ° extends.This kind of structure has weighed the contradiction between main borehole 2 difficulty of construction and mining step-down difficulty, ensures the efficiency of mining step-down while making it finally reach to reduce difficulty of construction to greatest extent.As α <-90 ° or α > 90 °, namely but the bearing of trend of main borehole 2 is towards the incline direction of tilted stratum, at this moment can obtain the efficiency of higher mining step-down add difficulty of construction and the risk of main borehole 2 simultaneously; When-90 °≤α≤90 °, namely the bearing of trend of main borehole 2 is towards the downdip direction of tilted stratum, at this moment the difficulty of construction of main borehole 2 and risk very low, and also possess the efficiency of higher mining step-down simultaneously.Simultaneously the contact area on main borehole 2 and stratum moves closer to 90 ° and increase along with the bearing of trend of main borehole 2 and the angle of downdip direction, and during α=0 °, contact area is minimum.Although this kind of structure can make the drilling cost in early stage improve, in follow-up continuous production process, not only can increase displacement more increase dredge oil amount, reach one horizontal well layout structure very efficiently.
In preferred a kind of embodiment, the main borehole 2 of each multi-branched horizontal well be arranged in parallel.There is between the be arrangeding in parallel of each main borehole 2 can ensure between adjacent main well 2 a fixing distance N, and then avoid the construction error caused when spudding in branch.Arranging is parallel to each other between main borehole 2 ensure that a fixing distance N between adjacent main well 2, when being conducive to spudding in branch on main borehole 2, the drilling parameter of boring survey tool is set, namely when the fixed range between main borehole 2 is M, the other end that then can arrange branch is a fixed numbers between (N-3) m ~ (N-15) m to the distance of the vertical line section of the main borehole 2 at its well place, ensures to be connected for permeating between the other end of branch and adjacent main shaft.But non-when being parallel to each other between main shaft, distance therebetween comes and go, when causing being drilled with branch, bore the difficult parameters of survey tool with setting, experience of can only examining arranges relevant parameter.If now branch is too short, infiltration be communicated with effect then can be very little, and if branch is long, then likely make the other end of branch and adjacent main well 2 penetrate, add the maintenance cost of later stage to unnecessary branch well hole 1.Simultaneously can adjust constant spacing between different parallel main borehole 2 according to the position of the superlatively main borehole 2 of gesture flexibly to the distance between extreme lower position, thus obtain rational layout.
In one embodiment of the invention, every two adjacent multi-branched horizontal wells are one group, and two multi-branched horizontal wells being arranged in a group share a straight well section 3.Mining cost can be reduced by this scheme.Adjacent two multi-branched horizontal wells are one group and share a diameter segment, not only can ensure that the carrying out of normal mining work also eliminates the operating expenses of extra diameter section simultaneously.
Another side of the present invention additionally provides a kind of construction method of multi-lateral horizontal well system, at least two multi-branched horizontal wells are drilled through in tilted stratum, and the connection straight well 4 of each multiple-limb level is arranged on the position of physical features lower than straight well section 3, and make to be connected by branch's current are logical between main borehole 2 in adjacent two multi-branched horizontal wells.
The multi-lateral horizontal well system obtained by this kind of construction method can be solved formation water in tilted stratum and carry out the problem of mining step-down.
In the preferred embodiment of the present invention, above-mentioned construction method comprises the following steps:
S1. be drilled with one group of spaced straight well at tilted stratum, and one group is positioned at straight well downdip direction, and arranges with straight well one_to_one corresponding and be communicated with straight well 4;
S2. get a straight well and drill through last multi-branched horizontal well as straight well section 3, the main borehole 2 of last multi-branched horizontal well is wherein drilled through towards corresponding connection straight well 4, according to the spacing between adjacent two straight wells, along departing from the one-sided of horizontal direction or both sides drill through branched branch well hole 1 downwards successively on the main borehole 2 of last multi-branched horizontal well;
S3. the straight well adjacent with the straight well of last multi-branched horizontal well is got as straight well section 3, the main borehole 2 of a rear multi-branched horizontal well is wherein drilled through towards corresponding connection straight well 4, the main borehole 2 of a rear multi-branched horizontal well and the main borehole 2 of last multi-branched horizontal well are connected by branch well hole 1 current of last multi-branched horizontal well are logical, and at the main borehole 2 of a rear multi-branched horizontal well along departing from the one-sided of horizontal direction or both sides drill through branch well hole 1 downwards successively;
S4. step S3 is repeated, to being covered with tilted stratum.
By above-mentioned 4 steps a kind of multi-lateral horizontal well system of layout in tilted stratum, wherein step S1 determines the trend of the main borehole 2 of multi-branched horizontal well, extend along downdip direction, ensure that normally can reduce the difficulty of construction of main borehole 2 by mining formation water simultaneously; Step S2 then ensure that multi-branched horizontal well is connected by its branch and adjacent multi-branched horizontal well current are logical, makes formation water in tilted stratum by branch's mining step-down; Step S3 and S4 then make whole multi-lateral horizontal well system layout be one to be led to the multi-branched horizontal well web frame be connected by the current of branch, and tilted stratum water is by the final mining step-down of continuous print branch.
In the second preferred embodiment of the present invention, above-mentioned construction method comprises the steps:
S1. be drilled with one group of spaced straight well at tilted stratum, and one group is positioned at straight well downdip direction, and arranges with straight well one_to_one corresponding and be communicated with straight well 4;
S2. drill through the main borehole 2 of multi-branched horizontal well respectively using each straight well as straight well section 3, straight well section 3 is connected with corresponding connection straight well 4;
S3. complete each all multi-branched horizontal wells main borehole 2 drill through work after, each multi-branched horizontal well main borehole 2 drills through branched branch well hole 1 downwards successively along the one or both sides of departing from horizontal direction; Main borehole 2 in adjacent two multi-branched horizontal wells is connected by branch well hole 1 current are logical.
The first unification of above-mentioned construction method drills through that main borehole 2 is follow-up drills through branch unified, it is logical connected that its adjacent main well 2 current are sent away in utilization point, be beneficial to the facility of construction, the parameter of boring through survey tool need not be adjusted back and forth and be conducive to the current controlled between branch and main borehole 2 and lead to connected structure, completely avoid unnecessary construction error.Wherein determine the spacing of adjacent level well and the bearing of trend of main borehole 2 in S1 step; Afterwards according to the bearing of trend of main borehole 2, unification drills through main borehole 2 in step s 2; The last parameter that branch's drilling tool is set according to the spacing of the adjacent level well determined in S1 step again, guarantee that the current in OK range are logical connected, final formation leads to connected multi-branched horizontal well networking by branch's current, effectively solves mining stratum water problem in inclination bottom.
Preferably, two multi-branched horizontal wells adjacent in above-mentioned all construction methods are one group, and in one group, two multi-branched horizontal wells are drilled through by a straight well section 3.Not only can ensure that the carrying out of normal mining work also eliminates the operating expenses of extra diameter section simultaneously.
These are only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (13)
1. a multi-lateral horizontal well system, described multi-lateral horizontal well system is arranged in tilted stratum, it is characterized in that, described multi-lateral horizontal well system comprises at least two multi-branched horizontal wells, and each described multi-branched horizontal well comprises respectively:
Straight well section (3);
Be communicated with straight well (4), be positioned on the position of physical features lower than described straight well section;
Main borehole (2), is connected between described straight well section (3) and described connection straight well (4);
Main borehole (2) described in adjacent two described multi-branched horizontal wells is connected by branch well hole (1) current are logical.
2. multi-lateral horizontal well system according to claim 1, it is characterized in that, the first end being arranged on the described branch well hole (1) between adjacent two main boreholes (2) is directly communicated with a described main borehole (2), and the second end departs from horizontal direction and is directly communicated with to downward-extension with main borehole described in another (2) or permeates and be communicated with.
3. multi-lateral horizontal well system according to claim 2, it is characterized in that, when second end and the main borehole described in another (2) of described branch well hole (1) permeate and be communicated with, the second end of described branch well hole (1) is 3 ~ 15 meters apart from the described distance of main borehole (2) described in another.
4. multi-lateral horizontal well system according to claim 1, it is characterized in that, be provided with multiple described branch well hole (1) between adjacent two described main boreholes (2), each described branch well hole (1) to stretch out formation by same a bite main borehole (2).
5. multi-lateral horizontal well system according to claim 1, it is characterized in that, be provided with multiple described branch well hole (1) between adjacent two described main boreholes (2), adjacent two described branch well holes (1) are stretched out by different described main boreholes (2) and are formed.
6. multi-lateral horizontal well system according to claim 5, is characterized in that, the horizontal projection length of described branch well hole (1) is 100 ~ 500 meters.
7. multi-lateral horizontal well system according to claim 1, is characterized in that, the described main borehole (2) of each described multi-branched horizontal well along and the incline direction angle of described tilted stratum be-90 °≤direction of α≤90 ° extends.
8. multi-lateral horizontal well system according to claim 7, is characterized in that, the described main borehole (2) of each described multi-branched horizontal well be arranged in parallel.
9. multi-lateral horizontal well system according to claim 1, is characterized in that, every two adjacent multi-branched horizontal wells are one group, and two multi-branched horizontal wells being arranged in a group share a straight well section (3).
10. the construction method of a multi-lateral horizontal well system, it is characterized in that, at least two multi-branched horizontal wells are drilled through in tilted stratum, and the connection straight well (4) of each described multiple-limb level is arranged on the position of physical features lower than straight well section (3), and make to be connected by branch's current are logical between main borehole (2) in adjacent two described multi-branched horizontal wells.
The construction method of 11. multi-lateral horizontal well systems according to claim 10, is characterized in that, described construction method comprises the following steps:
S1, be drilled with one group of spaced straight well, and one group is positioned at straight well incline direction at described tilted stratum, and arranges with described straight well one_to_one corresponding and be communicated with straight well (4);
S2, get a described straight well and drill through last multi-branched horizontal well as straight well section (3), the main borehole (2) of described last multi-branched horizontal well is wherein drilled through towards corresponding described connection straight well (4), according to the spacing between adjacent two straight wells, upper along departing from the one-sided of horizontal direction or both sides drill through branched branch well hole (1) downwards successively at the main borehole (4) of described last multi-branched horizontal well;
S3, get the straight well adjacent with the straight well of described last multi-branched horizontal well as straight well section (3), the main borehole (2) of a rear multi-branched horizontal well is wherein drilled through towards corresponding connection straight well (4), the main borehole (2) of a described rear multi-branched horizontal well is connected by branch well hole (1) current of described last multi-branched horizontal well are logical with the main borehole (2) of described last multi-branched horizontal well, and in the rear the main borehole of a multi-branched horizontal well along departing from the one-sided of horizontal direction or both sides drill through described branch well hole (1) downwards successively,
S4, repeating said steps S3, to being covered with described tilted stratum.
The construction method of 12. multi-lateral horizontal well systems according to claim 10, is characterized in that, described construction method comprises the following steps:
S1, be drilled with one group of spaced straight well, and one group is positioned at straight well incline direction at described tilted stratum, and arranges with described straight well one_to_one corresponding and be communicated with straight well (4);
S2, drills through the main borehole (2) of described multi-branched horizontal well respectively using each described straight well as straight well section (3), described straight well section (3) is connected with corresponding connection straight well (4);
S3, complete each described multi-branched horizontal well main borehole (2) drill through work after, drill through branched branch well hole (1) downwards successively in the upper one or both sides along departing from horizontal direction of each described multi-branched horizontal well main borehole (2); Main borehole (2) described in adjacent two multi-branched horizontal wells is connected by described branch well hole (1) current are logical.
13. according to claim 11 to the construction method of the multi-lateral horizontal well system according to any one of 12, it is characterized in that, two adjacent described multi-branched horizontal wells are one group, and in one group, two described multi-branched horizontal wells are drilled through by a described straight well section (3).
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| CN101949284A (en) * | 2010-09-25 | 2011-01-19 | 北京奥瑞安能源技术开发有限公司 | Coalbed methane horizontal well system and construction method thereof |
| CN102322252A (en) * | 2011-05-30 | 2012-01-18 | 北京奥瑞安能源技术开发有限公司 | Coal bed gas multi-branched horizontal well system and job practices thereof |
| CN203035177U (en) * | 2012-11-12 | 2013-07-03 | 中国石油天然气股份有限公司 | Coalbed methane (CBM) multi-branch horizontal well with communicating point in top plate or bottom plate rock stratum |
| 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 |
| CN204299560U (en) * | 2014-10-30 | 2015-04-29 | 北京奥瑞安能源技术开发有限公司 | A kind of multi-lateral horizontal well system |
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