CN104453833B - A kind of multi-lateral horizontal well system and its construction method - Google Patents
A kind of multi-lateral horizontal well system and its construction method Download PDFInfo
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- CN104453833B CN104453833B CN201410602147.8A CN201410602147A CN104453833B CN 104453833 B CN104453833 B CN 104453833B CN 201410602147 A CN201410602147 A CN 201410602147A CN 104453833 B CN104453833 B CN 104453833B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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. optimizing the spacing of wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
Abstract
The present invention provides a kind of multi-lateral horizontal well system and its construction method, this multi-lateral horizontal well system is arranged in tilted stratum, and multi-lateral horizontal well system includes at least two multi-branched horizontal wells, each multi-branched horizontal well to be included respectively：Straight well section；Straight well is connected, on position of the physical features less than straight well section；Main borehole is connected between straight well section and connection straight well, and main borehole is led to connected by branch well hole current in adjacent two multi-branched horizontal wells.By will at least two multi-branched horizontal wells be arranged in tilted stratum, and main borehole current are led to connected layout using branch well hole, water that can effectively in mining tilted stratum achievees the purpose that decompression parsing.
Description
Technical field
The present invention relates to coal bed gas field, in particular to a kind of multi-lateral horizontal well system and its construction method.
Background technology
Since the eighties in last century, with the development of the technologies such as measurement while-drilling instrument, motor and PDC drill bit, horizontal well
Drilling technology starts sizable application.Straight well or inclined shaft are bent by directional well technology by formation at target locations and parallel object layer bores
Into certain length, since stratum is usually horizontal or close to horizontal so the wellbore in destination layer is also horizontal or close
Horizontal, such well is usually called horizontal well.Horizontal well can be divided into single branch horizontal well and multi-branched horizontal well by well type；It is single
Branch horizontal well can be divided into traditional single branch horizontal well and connect horizontal well with U-shaped again；Multi-branched horizontal well has and can be divided into single main branch
Multi-branched horizontal well and double main branch multiple-limbs are horizontal, complete sequentially to have in main split to be divided into subdrilling branch or the main branch of subdrilling.
Coal bed gas extraction process is the process of draining, decompression, desorption and gas production.The mining of coal bed gas is by effectively arranging
Water, reduction bottom pressure desorb coal bed gas, the process that low pressure pit shaft is discharged are pooled to, usually using multiple-limb
Horizontal well completes this mining process.Coal bed gas extraction process is draining, decompression, desorption, gas production, and first joint draining just determines
Coal bed gas horizontal well mining pump must down toward horizontal well minimum point, only the point could effective draining, so as to fulfill decompression, solution
Suction and gas production.This just proposes requirement to horizontal well, multi-branched horizontal well drilling engineering：All branch well holes necessarily are greater than or wait
Position is pumped in mining, the optimum position of mining pump tripping in is the connectivity points of the U-shaped well of landing point or near-end/distal end.That is：It is right
U-shaped well, multi-branched horizontal well are connected in horizontal well, near-end, it is necessary to assure along inclination side in acline or tilted stratum
To drilling, arrangement；For the U-shaped horizontal well in distal end, it is necessary to assure in acline or along stratum direction drilling, the arrangement of having a down dip.
It so does and just can guarantee under gravity, water flooding flows to mining pump position (horizontal well extreme lower position), could effectively
Implement the mining of coal bed gas.
Multi-branched horizontal well can more effectively link up coal seam itself hole fissure channel, increase and let out (oil) gas area, branch
It controls aerogenesis resource area efficiency high, " hypotonic, low pressure, low saturation " feature of coal seam reservoirs can be overcome well.So more points
Branch horizontal well is subject to increasing attention and utilization in cbm development.But horizontal well and multi-branched horizontal well are main
Suitable for the exploitation of thin layer and low permeability reservoir.But it is more than the mining of the coal bed gas in 20 ° of inclination bottoms for inclination angle, due to it
The higher contradiction there are between mining difficulty and difficulty of construction of physical features, therefore the coal seam water in tilted stratum cannot obtain effectively always
Discharge.
The prior art is in the problem of mining decompression in tilted stratum, still using traditional multi-branched horizontal well
Pattern, although during mining, a preferable drainage effect can be obtained using the gravity of current, the problem of this technology, is opening
When boring multi-branched horizontal well, since suspending weight is held and reduced to tilted stratum, under frictional resistance, backing pressure effect, horizontal well is limited
Length is drilled in tilted stratum.Frictional resistance and backing pressure are directly proportional to the length and magnitude of inclination of horizontal well, in order to overcome frictional resistance
Apply the stability of excessive drilling parameter (bit pressure, suspending weight, torque etc.) destructible wellbore with backing pressure, particularly in mechanical strength
It is particularly easy to cause the generation of borehole collapse lock of tool drilling in the weak coal seam to collapse that easily collapses, leads to serious loss.
Based on the above problem, it is necessary to a kind of effective multi-lateral horizontal well system is proposed, to solve coal in tilted stratum
The problem of mining decompression of layer water is difficult.
The content of the invention
The present invention is intended to provide a kind of multi-lateral horizontal well system and its construction method, to solve the coal seam in tilted stratum
Gas drainage and step-down problem.
To achieve these goals, according to an aspect of the invention, there is provided a kind of multi-lateral horizontal well system, more points
Branch horizontal well system is arranged in tilted stratum, multi-lateral horizontal well system include at least two multi-branched horizontal wells, each more points
Branch horizontal well includes respectively：Straight well section；Straight well is connected, on position of the physical features less than straight well section；Main borehole is connected to straight well
Between section and connection straight well；Main borehole is led to connected by branch well hole current in adjacent two multi-branched horizontal wells.
Further, the first end and a main borehole for being arranged on the branch well hole between two neighboring main borehole directly connect
Logical, second end deviation horizontal direction, which is extended downwardly, with another main borehole directly connects or permeates connection.
Further, when the infiltration of the second end of branch well hole and another main borehole connects, the second end of branch well hole away from
It it is 3~15 meters with a distance from another main borehole.
Further, multiple branch well holes are provided between two neighboring main borehole, each branch well hole is by same a bite master
Wellbore extends outward to form.
Further, multiple branch well holes are provided between two neighboring main borehole, two neighboring branch well hole is by difference
Main borehole extend outward to form.
Further, the floor projection length of branch well hole is 100~500 meters.
Further, the main borehole edge of each multi-branched horizontal well is prolonged with the direction that downdip direction angle is -90 °≤α≤90 °
It stretches.
Further, the main borehole of each multi-branched horizontal well is arranged in parallel.
Further, the adjacent multi-branched horizontal well of each two is one group, and two multi-branched horizontal wells in one group are total to
With a straight well section.
According to another aspect of the present invention, a kind of construction method of multi-lateral horizontal well system is provided, in tilted stratum
In drill through at least two multi-branched horizontal wells, and make each multiple-limb level connection straight well be arranged on physical features be less than straight well section position
It puts, and between main borehole by branch's current to lead in two neighboring multi-branched horizontal well connected.
Further, construction method comprises the following steps：
S1 is drilled with one group of spaced straight well in tilted stratum and one group is located at straight well downdip direction, and and straight well
It corresponds and connection straight well is set；
S2 takes a straight well to drill through previous branch multi-branched horizontal well as straight well section, wherein straight towards corresponding connection
Well drills through the main borehole of previous branch multi-branched horizontal well, horizontal in previous branch multiple-limb according to the spacing between adjacent two straight wells
On the main borehole of well branched branch well hole is drilled through successively downwards along the unilateral side or both sides of deviateing horizontal direction；
S3 takes the straight well adjacent with the straight well of previous branch multi-branched horizontal well as straight well section, wherein towards corresponding
Connection straight well drills through the main borehole of latter branch multi-branched horizontal well, makes the main borehole of latter branch multi-branched horizontal well and previous branch more
The main borehole of branch horizontal well led to by the branch well hole current of previous branch multi-branched horizontal well it is connected, and in latter multiple-limb water
The main borehole of horizontal well drills through downwards branch well hole successively along the unilateral side or both sides for deviateing horizontal direction；
S4 repeats step S3, until tilted stratum is covered with.
Further, construction method comprises the following steps：
S1 is drilled with one group of spaced straight well in tilted stratum and one group is located at straight well downdip direction, and and straight well
It corresponds and connection straight well is set；
S2 drills through the main borehole of multi-branched horizontal well using each straight well as straight well section respectively so that straight well section with it is corresponding
Connection straight well be connected；
S3, complete the main borehole of each all multi-branched horizontal wells drill through work after, in each multi-branched horizontal well main shaft
On eye branched branch well hole is drilled through successively downwards along the one or both sides for deviateing horizontal direction；Make adjacent two multi-branched horizontal wells
Middle main borehole is led to connected by branch well hole current.
Further, two adjacent multi-branched horizontal wells are that two multi-branched horizontal wells are straight by one in one group, one group
Well section drills through.
Apply the technical scheme of the present invention a kind of multi-lateral horizontal well system and its construction method, by will be at least more than two
Branch horizontal well is arranged in tilted stratum, and main borehole current are led to connected layout using branch well hole, can be effective
Water in ground mining tilted stratum achievees the purpose that decompression parsing.This multi-lateral horizontal well system when in use, tilted stratum
In water by the effect of mining pump and gravity, be precipitated from stratum into main borehole, then from main borehole divide wellbore into
Enter branch, water flooding flow to adjacent main borehole by branch.Following water flooding repeats above-mentioned step, by branching to
Another main borehole, considerably increases displacement, until to greatest extent excluding water flooding, achievees the purpose that decompression parsing.
Description of the drawings
The accompanying drawings which form a part of this application are used for providing a further understanding of the present invention, and of the invention shows
Meaning property embodiment and its explanation do not constitute improper limitations of the present invention for explaining the present invention.In the accompanying drawings：
Fig. 1 shows the multi-lateral horizontal well system schematic diagram of embodiment according to the present invention.
Specific embodiment
Below in conjunction with the attached drawing of embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out in detail
Illustrate that in the case where there is no conflict, the feature in embodiment and embodiment in the application can be mutual group, it is necessary to illustrate
It closes.The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
As background section is introduced, existing in the prior art in tilted stratum cannot effectively drainage and step-down
The problem of.In order to solve the problems, such as this, inventor provides a kind of multi-lateral horizontal well system.It is as shown in Figure 1, this
Multi-lateral horizontal well system is arranged in tilted stratum, and multi-lateral horizontal well system includes at least two multi-branched horizontal wells, often
A multi-branched horizontal well includes respectively：Straight well section 3, connection straight well 4, main borehole 2, wherein connection straight well 4 is located at physical features less than straight
On the position of well section 3, main borehole 2 is connected between straight well section 3 and connection straight well 4, main shaft in adjacent two multi-branched horizontal wells
Eye 2 is led to connected by 1 current of branch well hole.
The above-mentioned multi-lateral horizontal well system of the present invention, by the way that at least tilted stratum will be arranged on by two multi-branched horizontal wells
In, and 2 current of main borehole are led into connected layout using branch well hole 1, water that can effectively in mining tilted stratum reaches
To the purpose of decompression parsing.When in use, the water in tilted stratum is pumped by mining and gravity for this multi-lateral horizontal well system
Effect, be precipitated from stratum into main borehole 2, then enter branch from point wellbore on main borehole 2, water flooding passes through branch
It flow to adjacent main borehole 2.Following water flooding repeats above-mentioned step, by branching to another main borehole 2, increases
Add displacement, until to greatest extent excluding water flooding, achieve the purpose that decompression parsing.
One kind is preferably carried out mode, is arranged on the first end of branch well hole 1 between two neighboring main borehole 2 and one
Main borehole 2 directly connects, and second end deviation horizontal direction, which is extended downwardly, with another main borehole 2 directly connects or permeate connection.
By above-mentioned connection relation, water flooding can more efficiently be come out from stratum by mining, reach decompression purpose.Branch well hole 1
One end and main borehole 2 be communicated with and be directly entered branch beneficial to water flooding, and when pressure is larger in water flooding, can take point
The mode that the branch other end is connected with adjacent main borehole 2 provides favourable layout for mining decompression, and when moderate pressure in water flooding
When, branch's other end can be taken to permeate the mode connected with adjacent main borehole 2, can not only reach normal decompression parsing
Effect also eliminates the expense of the later maintenance to extra branch well hole 1.
Preferably, when the infiltration of the second end of branch well hole 1 and another main borehole 2 connects, the second end of branch well hole 1 away from
It it is 3-15 meters with a distance from another main borehole 2.The second end distance of branch well hole 1 is arranged to another main borehole 2
Distance is 3-15 meters, can ensure that branch connects with the infiltration of adjacent main borehole 2 while normal decompression parsing is ensured.
When the distance that the second end distance of branch well hole 1 is arranged to another main borehole 2 is more than 3-15 meters, water flooding osmotic effect meeting
It is relatively poor, it is unfavorable for the mining decompression of water flooding, and when this distance is less than 3-15 meters, then it can face infiltration connection and become connecting
Logical possibility adds the maintenance cost in later stage.
It is highly preferred that being provided with multiple branch well holes 1 between two neighboring main borehole 2, each branch well hole 1 is by same a bite
Main borehole 2 extends outward to form.The setting of multiple branch well holes 1 adds the contact area on horizontal well and stratum, is not only beneficial to
Drainage and step-down in Different Strata, while gas production can also be increased, and branch well hole 1 is located at being convenient on a bite main borehole 2
Construction reduces construction cost.
Another preferred embodiment is provided with multiple branch well holes 1, two neighboring Multilateral Wells between two neighboring main borehole 2
Eye 1 is extended outward to form by different main boreholes 2.The setting of similary multiple branch well holes 1 adds connecing for horizontal well and stratum
Contacting surface is accumulated, and not only beneficial to the drainage and step-down in Different Strata, while can also increase gas production, and by branch well hole 1 by difference
Main borehole 2 extend outwardly, be conducive to balance the displacement and the dredge oil amount in later stage in each main borehole 2, reduce main borehole
2 maintenance cost.
In a preferred embodiment, the floor projection length of branch well hole 1 is 100-500 meters.Such layout can
So that adjacent two multi-branched horizontal wells play maximum drainage and step-down effect and ensure that the infiltration connection of branch well hole 1 will not simultaneously
It is destroyed.When the floor projection distance of branch well hole 1 is less than 100 meters, it is meant that the master of two adjacent multi-branched horizontal wells
Wellbore 2 from it is close, so not only reduce the pressure also added simultaneously with the contact area on stratum between two adjacent main boreholes 2
Force-disturbance improves the risk that main borehole 2 collapses.And when the floor projection distance of branch well hole 1 is more than 500 meters, it is adjacent
The main borehole 2 of two multi-branched horizontal wells is larger from, causing to bottom out farther out water speed in branch, improves and destroys branch well hole 1
The risk that infiltration with adjacent main branch wellbore connects.
Preferably, the main borehole 2 of each multi-branched horizontal well prolongs along with direction that downdip direction angle is -90 °≤α≤90 °
It stretches.Such structure has weighed the contradiction between 2 difficulty of construction of main borehole and mining decompression difficulty, it is made to be finally reached to greatest extent
Ground ensures the efficiency of mining decompression while reducing difficulty of construction.As ＜ -90 ° of α or 90 ° of α ＞, i.e. the extension of main borehole 2
At this moment direction can obtain the efficiency of higher mining decompression still while add main borehole towards the inclined direction of tilted stratum
2 difficulty of construction and risk；When -90 °≤α≤90 °, i.e., the extending direction of main borehole 2 towards tilted stratum downdip direction,
At this moment the difficulty of construction of main borehole 2 and risk are very low, and at the same time also possessing the efficiency of higher mining decompression.Main borehole simultaneously
2 with the contact area on stratum as the extending direction of main borehole 2 and the angle of downdip direction move closer to 90 ° and increase, α=0 °
When contact area it is minimum.Although such structure can improve the drilling cost of early period, during subsequent continuous production not
Displacement can only be increased and more increase dredge oil amount, reached a kind of very efficient horizontal well layout structure.
In a kind of preferred embodiment, the main borehole 2 of each multi-branched horizontal well is arranged in parallel.Each main borehole 2 is put down
Row sets between can ensureing between adjacent main borehole 2 tool there are one fixed distance N, and then avoids and cause when spudding in branch
Construction error.It sets to be mutually parallel between main borehole 2 and ensure that between adjacent main borehole 2 there are one fixed distance N, favorably
In when spudding in branch on main borehole 2, the drilling parameter for boring survey tool is set, i.e., when the fixed range between main borehole 2 is M
When, then the distance that can set the vertical line section of the main borehole 2 where the other end to its wellbore of branch is (N -3) m~(N -15) m
Between a fixed numbers, ensure between the other end of branch and adjacent main shaft for infiltration connection.But when between main shaft
Non- when being mutually parallel, distance change therebetween is indefinite, and when causing to be drilled with branch, the parameter for boring survey tool is difficult to set, can only
It examines experience and relevant parameter is set., can be very little if permeating the effect of connection at this time if branch is too short, and if branch's mistake
It is long, it is likely that the other end and adjacent main borehole 2 for making branch penetrate, add the later stage to the maintenance of extra branch well hole 1 into
This.The parallel masters of difference can be adjusted flexibly according to the distance between position of the main borehole 2 of highest physical features to extreme lower position simultaneously
Constant spacing between wellbore 2, so as to obtain rational layout.
In one embodiment of the invention, the adjacent multi-branched horizontal well of each two be one group, two in one group
Branch multi-branched horizontal well shares a straight well section 3.Mining cost can be reduced by this scheme.Adjacent two multi-branched horizontal wells
For one group and a diameter segment is shared, can not only ensure the progress of normal mining work while also eliminates extra diameter section
Operating expenses.
The another side of the present invention additionally provides a kind of construction method of multi-lateral horizontal well system, is drilled through in tilted stratum
At least two multi-branched horizontal wells, and the connection straight well 4 of each multiple-limb level is made to be arranged on the position that physical features is less than straight well section 3
On, and between main borehole 2 by branch's current to lead in two neighboring multi-branched horizontal well connected.
The multi-lateral horizontal well system obtained by such construction method can solve to carry out water flooding in tilted stratum
The problem of mining is depressured.
In the preferred embodiment of the present invention, above-mentioned construction method comprises the following steps：
S1. it is drilled with one group of spaced straight well in tilted stratum and one group is located at straight well downdip direction, and and straight well
It corresponds and connection straight well 4 is set；
S2. a straight well is taken to drill through previous branch multi-branched horizontal well as straight well section 3, wherein straight towards corresponding connection
Well 4 drills through the main borehole 2 of previous branch multi-branched horizontal well, according to the spacing between adjacent two straight wells, in previous branch multiple-limb water
On the main borehole 2 of horizontal well branched branch well hole 1 is drilled through successively downwards along the unilateral side or both sides of deviateing horizontal direction；
S3. the straight well adjacent with the straight well of previous branch multi-branched horizontal well is taken as straight well section 3, wherein towards corresponding
Connection straight well 4 drills through the main borehole 2 of latter branch multi-branched horizontal well, make the main borehole 2 of latter branch multi-branched horizontal well with it is previous
The main borehole 2 of branch multi-branched horizontal well led to by 1 current of branch well hole of previous branch multi-branched horizontal well it is connected, and latter more
The main borehole 2 of branch horizontal well drills through downwards branch well hole 1 successively along the unilateral side or both sides for deviateing horizontal direction；
S4. step S3 is repeated, until tilted stratum is covered with.
A kind of multi-lateral horizontal well system is laid out in tilted stratum by 4 above-mentioned steps, wherein step S1 is true
The trend of the main borehole 2 of multi-branched horizontal well is determined, has extended along downdip direction, ensure that normally mining water flooding to drop simultaneously
The low difficulty of construction of main borehole 2；Step S2 then ensure that multi-branched horizontal well is horizontal with adjacent multiple-limb by its branch
Well water circulation is connected, and the water flooding in tilted stratum is made to be depressured by branch's mining；Step S3 and S4 then make whole branch multiple-limb water
Horizontal well system layout leads to connected multi-branched horizontal well web frame for the current by branch, and tilted stratum water passes through continuous
Branch's final mining decompression.
In second of preferred embodiment of the present invention, above-mentioned construction method includes the following steps：
S1. it is drilled with one group of spaced straight well in tilted stratum and one group is located at straight well downdip direction, and and straight well
It corresponds and connection straight well 4 is set；
S2. the main borehole 2 of multi-branched horizontal well is drilled through using each straight well as straight well section 3 respectively so that straight well section 3 and institute are right
The connection straight well 4 answered is connected；
S3. complete the main borehole 2 of each all multi-branched horizontal wells drill through work after, in each multi-branched horizontal well main shaft
On eye 2 branched branch well hole 1 is drilled through successively downwards along the one or both sides for deviateing horizontal direction；Make adjacent two multiple-limb levels
Main borehole 2 is led to connected by 1 current of branch well hole in well.
Above-mentioned construction method first uniformly drills through main borehole 2 and is subsequently uniformly drilling through branch, makes its adjacent main shaft using branch
2 current of eye lead to connected, beneficial to the facility of construction, are not used to adjust back the whole parameter for being drilled through survey tool and are conducive to control branch
Current between main borehole 2 lead to connected structure, it is entirely avoided unnecessary construction error.Phase wherein is determined in S1 steps
The spacing of horizontal well that borders on the river and the extending direction of main borehole 2；Afterwards according to the extending direction of main borehole 2, unify to bore in step s 2
Take main borehole 2；The parameter of branch's drilling tool finally is set further according to the spacing of the adjacent level well determined in S1 steps, it is ensured that
Current in OK range lead to connected, ultimately form and lead to connected multi-branched horizontal well network by branch's current, effective to solve
The problem of mining water flooding in inclination bottom of having determined.
Preferably, two multi-branched horizontal wells adjacent in above-mentioned all construction methods are more than two points in one group, one group
Branch horizontal well is drilled through by a straight well section 3.It can not only ensure that the progress of normal mining work also eliminates extra diameter simultaneously
The operating expenses of section.
It these are only the preferred embodiment of the present invention, be not intended to limit the invention, for those skilled in the art
For member, the invention may be variously modified and varied.Any modification within the spirit and principles of the invention, being made,
Equivalent substitution, improvement etc., should all be included in the protection scope of the present invention.
Claims (11)
1. a kind of multi-lateral horizontal well system, the multi-lateral horizontal well system is arranged in tilted stratum, which is characterized in that institute
Stating multi-lateral horizontal well system includes at least two multi-branched horizontal wells, and each multi-branched horizontal well includes respectively：
Straight well section (3)；
Straight well (4) is connected, on position of the physical features less than the straight well section；
Main borehole (2) is connected between the straight well section (3) and the connection straight well (4)；
Main borehole (2) described in adjacent two multi-branched horizontal wells is led to connected by branch well hole (1) current.
2. multi-lateral horizontal well system according to claim 1, which is characterized in that be arranged on two neighboring main borehole (2)
Between the first end of the branch well hole (1) directly connected with a main borehole (2), second end deviate horizontal direction to
Lower extension directly connects with main borehole another described (2) or permeates connection.
3. multi-lateral horizontal well system according to claim 2, which is characterized in that the second end of the branch well hole (1)
When being connected with main borehole another described (2) infiltration, another described described main shaft of second end distance of the branch well hole (1)
The distance of eye (2) is 3~15 meters.
4. multi-lateral horizontal well system according to claim 1, which is characterized in that the two neighboring main borehole (2) it
Between be provided with multiple branch well holes (1), each branch well hole (1) is extended outward to form by same a bite main borehole (2).
5. multi-lateral horizontal well system according to claim 1, which is characterized in that the two neighboring main borehole (2) it
Between be provided with multiple branch well holes (1), the two neighboring branch well hole (1) is outside by the different main boreholes (2)
It extends to form.
6. multi-lateral horizontal well system according to claim 5, which is characterized in that the horizontal throwing of the branch well hole (1)
Shadow length is 100~500 meters.
7. multi-lateral horizontal well system according to claim 1, which is characterized in that each multi-branched horizontal well it is described
Main borehole (2) extends along the direction that the inclined direction angle with the tilted stratum is -90 °≤α≤90 °.
8. multi-lateral horizontal well system according to claim 7, which is characterized in that each multi-branched horizontal well it is described
Main borehole (2) is arranged in parallel.
9. multi-lateral horizontal well system according to claim 1, which is characterized in that the adjacent multi-branched horizontal well of each two is
One group, two multi-branched horizontal wells in one group share a straight well section (3).
10. a kind of construction method of multi-lateral horizontal well system, which is characterized in that drilled through in tilted stratum at least more than two point
Branch horizontal well, and the connection straight well (4) of each multiple-limb level is made to be arranged on physical features and is less than on the position of straight well section (3), and
So that led in the two neighboring multi-branched horizontal well between main borehole (2) by branch's current it is connected,
The construction method comprises the following steps：
S1 is drilled with one group of spaced straight well and one group in the tilted stratum and is located at straight well inclined direction, and with it is described
Straight well, which corresponds, sets connection straight well (4)；
S2 takes a straight well to drill through previous branch multi-branched horizontal well as straight well section (3), wherein towards corresponding described
Connection straight well (4) drills through the main borehole (2) of the previous branch multi-branched horizontal well, according to the spacing between adjacent two straight wells,
The unilateral side of edge deviation horizontal direction or both sides drill through downwards branched successively on the main borehole (2) of the previous branch multi-branched horizontal well
Branch well hole (1)；
S3 takes the straight well adjacent with the straight well of the previous branch multi-branched horizontal well as straight well section (3), wherein corresponding to
Connection straight well (4) drill through the main borehole (2) of latter branch multi-branched horizontal well, make the main shaft of the latter branch multi-branched horizontal well
The branch well hole that the main borehole (2) of eye (2) and the previous branch multi-branched horizontal well passes through the previous branch multi-branched horizontal well
(1) current lead to connected, and the main borehole of a multi-branched horizontal well is downward along the unilateral side or both sides for deviateing horizontal direction in the rear
The branch well hole (1) is drilled through successively；
S4, repeating said steps S3, until the tilted stratum is covered with；
Or the construction method comprises the following steps：
S1 is drilled with one group of spaced straight well and one group in the tilted stratum and is located at straight well inclined direction, and with it is described
Straight well, which corresponds, sets connection straight well (4)；
S2 drills through the main borehole (2) of the multi-branched horizontal well so that described using each straight well as straight well section (3) respectively
Straight well section (3) is connected with corresponding connection straight well (4)；
S3, complete the main borehole (2) of each multi-branched horizontal well drill through work after, in each multi-branched horizontal well master
In wellbore (2) branched branch well hole (1) is drilled through successively downwards along the one or both sides for deviateing horizontal direction；Make adjacent more than two points
Main borehole (2) described in branch horizontal well is led to connected by the branch well hole (1) current.
11. the construction method of multi-lateral horizontal well system according to claim 10, which is characterized in that two adjacent institutes
It is that two multi-branched horizontal wells are drilled through by a straight well section (3) in one group, one group to state multi-branched horizontal well.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6050335A (en) * | 1997-10-31 | 2000-04-18 | Shell Oil Company | In-situ production of bitumen |
| CN1659359A (en) * | 2001-10-19 | 2005-08-24 | Cdx天然气有限公司 | Method and system for dewatering of coal seams |
| 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 |
| CN103867124A (en) * | 2013-05-31 | 2014-06-18 | 华北石油管理局 | CBM (Coal-Bed Methane) multi-branch horizontal well system suitable for uniclinal 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 |
-
2014
- 2014-10-30 CN CN201410602147.8A patent/CN104453833B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6050335A (en) * | 1997-10-31 | 2000-04-18 | Shell Oil Company | In-situ production of bitumen |
| CN1659359A (en) * | 2001-10-19 | 2005-08-24 | Cdx天然气有限公司 | Method and system for dewatering of coal seams |
| 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 |
| CN103867124A (en) * | 2013-05-31 | 2014-06-18 | 华北石油管理局 | CBM (Coal-Bed Methane) multi-branch horizontal well system suitable for uniclinal 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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