CN109386268A - A kind of oil-gas reservoir reservoir fracturing method - Google Patents
A kind of oil-gas reservoir reservoir fracturing method Download PDFInfo
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- E—FIXED CONSTRUCTIONS
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- 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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- E21B43/26—Methods for stimulating production by forming crevices or fractures
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Abstract
The present invention provides a kind of oil-gas reservoir reservoir fracturing methods, comprising: forms gang of wells in target oil-gas reservoir reservoir, the gang of wells includes first level well and the second horizontal well, and links up the straight well of the toe of first level well and the second horizontal well；In the horizontal segment perforation of first level well and the second horizontal well and implement pressing crack construction respectively；Then the perforation in straight well carries out the row's of returning operation from the pit shaft of straight well.Method provided by the invention combines straight well and the respective advantage of horizontal well, maximally utilises horizontal well and crack to the abundant communication of oil-gas reservoir and its reciprocation, realizes that large-scale draining loses heart volume, and then the raising of realization reservoir stimulation effect.
Description
Technical field
The invention belongs to technical field of petroleum extraction, and in particular to a kind of oil-gas reservoir reservoir fracturing method, more particularly to mention
The method of high low-permeability, Extra-low permeability oil-gas reservoir reservoir fracturing.
Background technique
For low-permeability, Extra-low permeability oil-gas reservoir (referred to as hypotonic special low permeability oil field), mention to the maximum extent
High swept volume is most important.The common technology for improving oil gas swept volume at present mainly has straight well massive hydraulic fracturing technology, level
Well staged fracturing technology etc..With the success and business sexual openness of shale gas fracturing technique, volume fracturing technology is also gradually risen.
Using volume fracturing technology, on the basis of straight well massive hydraulic fracturing and horizontal well fracturing, answering for each crack how is improved
Polygamy degree and transformation volume become mainly pursuing a goal for FRACTURING DESIGN.
But due to the difficulty and technical complexity of volume fracturing, really realize the difficulty pole for improving oil gas swept volume
Greatly.Therefore, for hypotonic special low permeability oil field, the pressure break exploitation effect of straight well or horizontal well is sometimes also unsatisfactory,
Technically be primarily present following problems: (1) the fracture height control difficulty of straight well massive hydraulic fracturing is big, branch of the proppant in effective thickness
Support area is greatly reduced；(2) horizontal well fracturing to involve range still limited, be essentially confined to horizontal segment length and raphe transection
The range of overall length.For being still stripper well after pressure, after individually using straight well or fractured horizontal well, oil gas swept volume is still
It is less than normal.
Therefore, it is necessary to study and propose a kind of oil gas sweep area and the volume of capable of improving by a relatively large margin to improve fracturing reform
The new fracturing process of effect.
Summary of the invention
The object of the present invention is to provide a kind of oil-gas reservoir fracturing process, especially for the pressure break side of hypotonic special low permeability oil field
Method carries out fracturing reform in conjunction with straight well and horizontal well, maximally utilises the abundant communication of horizontal well and crack to oil-gas reservoir
And its reciprocation, realize that large-scale draining loses heart volume, and then realize the raising of reservoir stimulation effect.
The oil-gas reservoir reservoir fracturing method provided according to the present invention, comprising: gang of wells is formed in target oil-gas reservoir reservoir, it is described
Gang of wells includes first level well and the second horizontal well, and links up the straight well of the toe of first level well and the second horizontal well；Point
In the horizontal segment perforation of first level well and the second horizontal well and pressing crack construction is not implemented；The perforation in straight well, then from straight well
Pit shaft carry out the row's of returning operation.
As it was noted above, improving swept volume to the maximum extent to Guan Chong for hypotonic special low permeability oil field pressure break
It wants, common technology mainly has straight well massive hydraulic fracturing technology, horizontal well stage fracturing technology etc. at present, but due to the difficulty of volume fracturing
Degree and technical complexity, the difficulty really realized are very big.Fracturing process provided by the invention, is used in combination straight well and horizontal well,
And rationally arranged to it, maximally utilise horizontal well and crack to oil-gas reservoir it is abundant communication and its reciprocation,
Realize that large-scale draining loses heart volume, is therefore particularly suitable for exploitation and the fracturing reform of hypotonic special low permeability oil field.
In method provided by the invention, the gang of wells of formation may include multiple wells, such as may include two mouthfuls or three mouthfuls
Above horizontal well and a bite straight well；Consider from construction complexity and construction cost, is preferably formed as two mouthfuls of water horizontal wells and a bite is straight
Well.Preferably, two mouthfuls of water horizontal wells are adjacent, and toe is also adjacent, the gang of wells of two mouthfuls of water horizontal wells and a bite straight well formation class " W " type,
Straight well is formed by the toe and horizontal well of horizontal well and is connected.
In fracturing process provided by the invention, straight well is configured to connect the toe of horizontal well, is formed by 3 mouthfuls
" W " type well unit of well construction.The operation of straight well is equivalent to the draining or discouraged area of two mouthfuls of original independent horizontal wells
(volume) organically connects, and further expansion whole draining (gas) effect is conducive to the effect for giving full play to 1+1 > 2.
Certain preferred embodiments according to the present invention, oil-gas reservoir reservoir fracturing method provided by the invention include following step
It is rapid:
1) reservoir evaluation parameter is measured；
2) reservoir evaluation parameter based on step 1) measurement, determines the workability of horizontal well, preferably includes horizontal segment length
Degree, fracture length, seam spacing and flow conductivity, and determine corresponding fracturing parameter, while choosing the perforation position of horizontal segment
It sets；
3) first level well, the second horizontal well and straight well optionally, are constructed, and straight well is made to link up first level well and second
The toe of horizontal well；
4) perforation is carried out in the horizontal segment of first level well and the second horizontal well, then implements staged fracturing construction；
5) the fractured layer position for corresponding to first level well and the second horizontal well in straight well carries out perforation, and perforation direction is parallel
In the pit shaft direction of first level well and the second horizontal well；And
6) glue is synchronized brokenly from the pit shaft of straight well return row's operation.
The fracturing process provided according to the present invention, on the basis of carrying out comprehensive evaluating reservoir to reservoir, with maturation
Oil-gas reservoir simulation softward carries out simulative optimization to the length of horizontal wellbore, staged fracturing length, section spacing, cluster spacing and yield,
And then Optimum Fracturing construction parameter, first level well and the second horizontal well are bored in formation at target locations and form company with two mouthfuls of water horizontal wells
The straight well connect maximally utilises horizontal well and crack to the abundant communication of oil-gas reservoir and its reciprocation, realizes a wide range of
Draining lose heart volume, realize reservoir stimulation effect maximization.
The fracturing process provided according to the present invention, first implementation steps 1), comprehensive evaluation is carried out to target reservoir, is obtained
Obtain evaluation parameter.Specifically, can the methods of integrated application well logging, well logging, core experiment, existing well pressure break analysis and assessment, it is right
The parameters such as lithology, physical property, oil-containing (gas) property, electrical property, rock mechanics, three-dimensional crustal stress, sensibility and the fluid properties of target zone
Carry out comprehensive assessment.The evaluation parameter and evaluation means of target reservoir are all that those skilled in the art can grasp,
This is not repeated.
To guarantee the accuracy of assessment and to the accurate instruction of later period simulation and construction parameter selection, each seed ginseng should be noted
Several compliance evaluation, such as the conversion of core permeability and formation effective permeability, well logging Young's modulus and core test Young
The conversion etc. of modulus.
It is worth noting that the reservoir parameter to horizontal segment is assessed, it is preferred that survey full logging program as much as possible, such as
Natural gamma, density, dipole sonic etc., in order to horizontal segment geology dessert and engineering dessert assessed in detail, thus
Determine optimal perforated interval cluster position.
By reservoir is carried out exploration test obtain evaluation result after, can based on evaluation result to horizontal wellbore length, split
It is preferred to stitch the carry out such as length, flow conductivity.In certain embodiments, using orthogonal design method, to the level of horizontal well
3 level values are respectively arranged in four segment length, fracture length, seam spacing, flow conductivity parameters, pass through the simulation meter of yield after pressure
It calculates, determines " W " type well maximum production or the maximum above-mentioned each parameter combination of input-output ratio.Simulation process can be by art technology
Personnel operate according to the actual situation, and therefore not to repeat here.
Certain preferred embodiments according to the present invention are longer than other positions in the root of horizontal well and the crack of toe
Crack in the middle part of crack, or the root in horizontal well, toe and horizontal segment is longer than the crack of other positions.The previous case is split
It stitches distribution of lengths and forms class U-typed, the fractue spacing of latter situation forms class " W " type.It should be understood that the root of horizontal well, toe
Crack in the middle part of portion and optionally horizontal segment is longer than the crack of other positions, refers to the crack relative to horizontal well other positions,
The crack that this several place is formed is relatively long, but the fracture length for not limiting this several place is equal.Refer to horizontal segment in the middle part of horizontal segment
Near midpoint, for example, apart from horizontal well root be (horizontal section length/2) ± 2% position, and be not limited to just at
The midpoint of horizontal segment.The rift portion of above-mentioned class U-typed or class " W " type, can either guarantee pressure after oil gas sweep area and
Volume, and fracturing material and construction cost can be saved.
Based on split waveguide as a result, using such as common crack extended simulation software such as Fracpro PT,
Stimplan, GOFHER etc. are simulated, and the pressure break that determination will realize that the fracture length of above-mentioned optimization and flow conductivity need is applied
Work parameter system, such as discharge capacity, liquid measure, support dosage, construction sand liquor ratio and fracturing fluid viscosity.
Meanwhile based on the evaluating reservoir of step 1) as a result, preferred levels section perforating site.Wherein, geology sweet tea is preferentially selected
It selects and position that engineering dessert is all good carries out perforating design., engineering good for geology dessert dessert difference or geology dessert is poor, engineering
The good position of dessert, preferentially selects the former.It can also be according to the compressibility exponential size for comprehensively considering geology dessert and engineering dessert
It is ranked up, the determination of perforating site is then carried out by ranking results.
Certain preferred embodiments according to the present invention are drilled the first level well and second along minimum principal stress orientation
Horizontal well.That is, direction of the direction of horizontal well along minimum principal stress, to carry out drilling process smoothly safely.
Certain preferred embodiments according to the present invention, the distance between first level well and the toe of the second horizontal well are
0.8-1 times of the mineshaft diameter of straight well.In this way, guarantee straight well the toe of horizontal well is connected, so as to horizontal well
It is formed and is sufficiently linked up, generate maximized reciprocation, promote the formation of the discouraged volume of large-scale draining.
Certain preferred embodiments according to the present invention, it is real in the horizontal segment of horizontal well using hydraulic perforation technology
More cluster cracks perforation and crack initiation in one section existing；It is preferred that injection rate is in 190m/s or more, such as 190-210m/s.Preferably,
It realizes using hydrajetting techniques perpendicular to 3-6 eyelet of arrangement in the plane of horizontal wellbore axis direction.The perforating modes are kept away
Exempt from multiple cracking effect in previous spiral perforation bring cluster, and realizes the induced stress that more cluster fracture initiations generate in section
The synergistic effect of interference, to improve fracturing effect.Specifically, the hydrajet tool that can connect 2-3 uses dragging water
The methods of power spraycan realizes more cluster cracks perforation and the crack initiation in one section.
The determination of the parameters such as water-jet jet size, eyelet quantity, those skilled in the art are in combination with actual reservoir feelings
Condition and the well head operation pressure of permission just select.Preferably, these parameters select to reach with jet velocity 190m/s for
Criterion (for the effect for guaranteeing jet perforating, is not required using the minimum jet velocity of 131m/s).
Certain preferred embodiments according to the present invention, to the staged fracturing of first level well and the second horizontal well from toe
Start, the method that first segment uses perforating gun under coiled tubing, plays perforation hole rifle after perforation and carry out pressing crack construction；Then, cable
Lower pumping bridge plug and perforating gun, after waiting bridge plugs to reach predetermined position, setting bridge plug of lighting a fire is given up, and then above mentions perforating gun in advance
Perforation is set in positioning, plays perforation hole rifle, pressure break；And so on, until carrying out all sections of pressing crack construction operation.
Certain preferred embodiments according to the present invention carry out reciprocity number of segment to first level well and the second horizontal well simultaneously
Staged fracturing.The fracturing process provided according to the present invention, it is preferred to use two sets of fracturing unit truck group concurrent fracturing first level wells and
Second horizontal well since toe, while carrying out the staged fracturing of reciprocity number of segment, to improve construction efficiency, and sufficiently benefit
With the induced stress interference effect of early period.So-called equity number of segment refers to that two mouthfuls of water horizontal wells respectively start to press using toe as first segment
It splits, synchronously piecewise pressure break.
In a further preferred embodiment, the horizontal section length of first level well and the second horizontal well is equal.It needs
Illustrate, in the present invention, the equal level for referring to this two mouthfuls of wells of the horizontal section length of first level well and the second horizontal well
Segment length is substantially equal, such as can be considered equal length within two horizontal section length differences 1%.In the preferred embodiment party
In case, the horizontal section length of two mouthfuls of water horizontal wells is of substantially equal, and number of segment is also identical, ensure that Liang Koujing synchronizes pressure break.
Certain preferred embodiments according to the present invention correspond to the toe of first level well and the second horizontal well in straight well
Portion carries out perforation, and perforation is oriented parallel to the pit shaft direction of first level well and the second horizontal well.Perforation straight well and quantity are really
Fixed, those skilled in the art can combine two mouthfuls of horizontal flat well yield sizes of saliva, it is contemplated that the influence of Kong Zhaoxia to yield etc. comes
Determine the perforating scheme of straight well.
According to the present invention, after the completion of to straight well perforating job, in all slits section generated in staged fracturing construction
Fracturing fluid thorough broken glue simultaneously, while the row of returning, such flowback effect are best.By straight well cylinder in the section of horizontal well crack
The glue that synchronizes brokenly of fracturing fluid returns row, can avoid partial fracture in advance break glue caused by following aspect the problem of: proppant sedimentation
Effect reduces effective support volume in crack；Leak-off injury increases, and reduces yield after pressure；Accelerate closing too early for crack
It closes, being difficult to carry out the remedial measure of crack inner support section, (horizontal well generally used replacement strategy, in order to guarantee that nearly well is split
The relatively high flow conductivity of seam, the opportune time that the crack Yao Liyong is not closed carry out the row of returning of fracturing fluid, will be far from well
The proppant of mouth migrates to nearly Jing Liefengchu again, to realize optimal fracture support section effect).
According to the present invention, the row's of returning opportunity is suitable with the row's of returning opportunity of conventional single horizontal well, and discharge speed should be set as
The normal discharge speed of previous single horizontal well just can ensure that the same row's of returning intensity (to each single level close to 2 times
For well).Therefore, in certain preferred embodiments of the invention, the discharge speed by the pit shaft of straight well is previous single
2 times or so of the normal discharge speed of horizontal well, i.e. the single port horizontal well institute to be calculated according to the oil nozzle of single port horizontal well
1.8-2.1 times of the discharge speed needed, preferably 1.9-2.0 times, to ensure the same row's of returning intensity.
The fracturing process provided according to the present invention can also be included in brokenly after glue returns row and carry out asking production operation.Wherein, production is asked
Operation can execute according to a conventional method, not go to live in the household of one's in-laws on getting married herein.
It should be noted that the above-mentioned steps 1 that method provided by the invention includes) -6) and it includes concrete operations
Implementation sequence there is no considered critical, if it will be understood by those skilled in the art that for theoretically it is feasible.For example,
In fracturing process provided by the invention, to the length of horizontal well horizontal segment, fracture length, seam spacing and water conservancy diversion energy in step 2)
The determination of the perforating site of power, corresponding fracturing parameter and horizontal segment might not be carried out continuously.For example, step 2)
The selection of the perforating site of middle horizontal segment can carry out after step 3).
Compared with existing hypotonic special low permeability oil field fracturing technique, present invention employs completely new processing techniques, provide
A kind of new oil-gas reservoir reservoir fracturing method is drilled into few two mouthfuls of water horizontal wells, the toe phase of horizontal well along minimum principal stress orientation
Neighbour, a distance about straight well diameter；In two toe joining places, a bite straight well is beaten, two mouthfuls of water horizontal well toes are connected
Come, ultimately forms " W " type gang of wells, and carry out to the length of horizontal wellbore, staged fracturing length, section spacing, cluster spacing and yield
Simulative optimization.
Fracturing process provided by the invention sufficiently combines the respective advantage of vertical well fracture and horizontal well fracturing, will be former
The draining or discouraged area (volume) of two mouthfuls of first independent horizontal wells organically connect, the whole draining of further expansion
(gas) effect is conducive to the effect for giving full play to 1+1 (horizontal well) > 2, excavates the Increase production ability of reservoir to the maximum extent.
Specific embodiment
Below in conjunction with specific embodiment, the present invention will be further described, it should be appreciated that, the scope of the present invention is simultaneously
Exemplary embodiment without being limited thereto.
Using fracturing process provided by the invention, design of hydraulic fracturing scheme is carried out to the target reservoir in the Sichuan Basin and scene is first
Lead test, including following procedure.
(1) interval of interest lithology is shale, and intrinsic fracture is relatively developed.Target zone pressure break well section is 2515.0-2595.5m,
Thickness 80.5m, reservoir are averaged Young's modulus 26.8GPa, and average Poisson's ratio 0.22, temperature is 108 DEG C.In conjunction with log data, record
Well data, core experiment data, analysis have obtained the well parameters and earth stress, lithology and mineral feature and intrinsic fracture developmental state, have passed through
Assessment to the reservoir parameter of horizontal segment such as natural gamma, density, dipole sonic, determines geology dessert.
(2) two mouthfuls of adjacent horizontal wells of A, B, the drilling straight-hole C well near horizontal well are bored along minimum principal stress direction.A, B well
Horizontal section length it is roughly equal, toe distance be approximately equal to C well diameter, and C well connection A, B well toe.
(3) numerical simulation software ECLIPSE is utilized, using orthogonal design method between horizontal section length, fracture length, seam
Away from, flow conductivity, pressure break number of segment, section spacing, number of clusters etc. be optimized.A, B well horizontal section length is 1000m, is passed through
ECLIPSE software simulates the horizontal productivity under different fracture lengths, flow conductivity, and fracture length is advisable with 200-220m, leads
Stream ability is advisable with 26-29mD.m.It is 25-28m that the minimum range interfered between seam, which is calculated, point 12 sections of progress pressure breaks, every section
2~4 cluster of perforation, every 0.75~1m of cluster.Wherein, the distribution of fracture length uses among root, toe and the horizontal segment of horizontal well
The crack of relatively long (about 220m) is arranged in position, and " W " type of the cracking initiation of relatively short (about 200m) is arranged in other positions
Cloth slit die formula.
(4) perforation is carried out using 2-3 concatenated hydrajet tools, realized perpendicular to the flat of horizontal wellbore axis direction
3-6 eyelet, more cluster cracks perforation and crack initiation in one section are arranged in face.Wherein, hydrajet tool uses 102 bullet of 89mm rifle,
16 holes Kong Miwei/m, total 48 hole of hole count of single hop, perforation diameter 12mm or more.
(5) glutinous to operational discharge capacity, liquid measure, proppant type, dosage, fracturing fluid type, fracturing fluid using Gofher software
The construction parameters such as degree optimize.Operational discharge capacity is 8-14m3/ min, the total 1400~1600m of liquid measure of single hop3, fracturing fluid takes cunning
Slip water+glue mixing fracturing fluid, wherein the 70~80% of the smooth total fluid volume of water consumption Zhan；Single hop proppant total amount be 60~
70m3, wherein 100 7~8m of mesh haydite3, 40,/70 49~55m of mesh precoated sand3, 30,/50 9~12m of mesh precoated sand3。
The method that first segment pressure break uses perforating gun under coiled tubing plays perforation hole rifle after perforation and carries out normal pressure break and applies
Work.Then, bridge plug and perforating gun are pumped under cable, after waiting bridge plugs to reach predetermined position, setting bridge plug of lighting a fire is given up, then on
Perforating gun is mentioned to predetermined position perforation, plays perforation hole rifle, normal pressure break.And so on, it has carried out all sections of pressing crack construction and has made
Industry.Two mouthfuls of water horizontal wells carry out pressure break simultaneously, carry out from toe.
(6) after the completion of two mouthfuls of water horizontal well pressing crack constructions, in the layer position of horizontal well toe, two horizontal wells are being parallel to
Pit shaft orientation carries out perforation, 16 holes Kong Miwei/m to straight well, and hole count is 48 holes.
(7) the delayed breaking down technology for using ammonium persulfate capsule breaker calculates every section of pump note according to fracture simulation software
The temperature of fracturing fluid in formation fracture optimizes ammonium persulfate capsule breaker under the different temperatures obtained by laboratory experiment
Additional amount controls gel breaking time, two mouthfuls of water horizontal well fracturing fluids being finally reached when (6) are completed in (5) while broken glue.
(8) production operation is asked.
Carried out pressing crack construction by target oil-gas reservoir reservoir of the above-mentioned steps to the Sichuan Basin, site construction technology obtain at
Function.Preferable correctional effect is achieved after pressure, initial stage daily output tolerance is 16 × 10 after A well pressure4m3/ d~18 × 104m3/ d, half a year
The daily output is stablized 11 × 10 afterwards4m3/ d or so；Initial stage daily output tolerance is 14 × 10 after B well pressure4m3/ d~15 × 104m3/ d, half
The daily output is stablized 9 × 10 after year4m3/ d or so.
Shown by the pilot test of several mouthfuls of wells in the area: using for reference process proposed by the present invention, initial stage day oil-producing after pressure
Amount reaches 2~3 times of offset well or so, and production decline is considerably slower than offset well or adjacent area block after pressure, and stable yields and validity period are bright after pressure
It is aobvious to increase, significant oil increasing effect is achieved, the fracturing transformation effect of such reservoir is improved.
Although the present invention has been described in detail, it will be understood by those skilled in the art that in spirit and scope of the invention
Modification will be apparent.However, it should be understood that various aspects, different specific embodiment that the present invention records
Each section and the various features enumerated can be combined or all or part of exchange.In above-mentioned each specific embodiment, that
A little embodiments with reference to another embodiment can be combined suitably with other embodiment, this is will be by this field skill
Art personnel are to understand.In addition, it will be understood to those of skill in the art that the description of front is only exemplary mode, not purport
In the limitation present invention.
Claims (10)
1. a kind of oil-gas reservoir reservoir fracturing method, which is characterized in that the described method includes: forming well in target oil-gas reservoir reservoir
Group, the gang of wells include first level well and the second horizontal well, and link up the toe of first level well and the second horizontal well
Straight well；
In the horizontal segment perforation of first level well and the second horizontal well and implement pressing crack construction respectively；
Then the perforation in straight well carries out the row's of returning operation from the pit shaft of straight well.
2. the method according to claim 1, wherein the following steps are included:
1) reservoir evaluation parameter is measured；
2) reservoir evaluation parameter based on step 1) measurement, determines the workability of horizontal well, preferably includes horizontal section length, splits
Length, seam spacing and flow conductivity are stitched, and determines corresponding fracturing parameter, while choosing the perforating site of horizontal segment；
3) first level well, the second horizontal well and straight well are constructed, and makes the toe of straight well communication first level well and the second horizontal well
Portion；
4) perforation is carried out in the horizontal segment of first level well and the second horizontal well, then implements staged fracturing construction；
5) the fractured layer position for corresponding to first level well and the second horizontal well in straight well carries out perforation；And
6) glue is synchronized brokenly from the pit shaft of straight well return row's operation.
3. method according to claim 1 or 2, which is characterized in that in step 3), drill institute along minimum principal stress orientation
State first level well and the second horizontal well.
4. method according to any one of claim 1-3, which is characterized in that the toe of first level well and the second horizontal well
The distance between portion is 0.8-1 times of the mineshaft diameter of straight well.
5. method according to any of claims 1-4, which is characterized in that in the root of horizontal well and the crack of toe
It is longer than the crack in the middle part of the crack of other positions, or the root in horizontal well, toe and horizontal segment and is longer than splitting for other positions
Seam.
6. method according to any one of claims 1-5, which is characterized in that in construction, to first level well and second
Horizontal well carries out the staged fracturing of reciprocity number of segment simultaneously；It is preferred that the horizontal section length of first level well and the second horizontal well is equal.
7. method according to claim 1 to 6, which is characterized in that using hydraulic perforation technology in level
More cluster cracks perforation and the crack initiation in one section are realized in the horizontal segment of well；It is preferred that injection rate is in 190m/s or more.
8. method according to claim 1 or 2, which is characterized in that the segmentation pressure of first level well and the second horizontal well
It splits since toe, the method that first segment uses perforating gun under coiled tubing, plays perforation hole rifle after perforation and carry out pressing crack construction；So
Afterwards, bridge plug and perforating gun are pumped under cable, after waiting bridge plugs to reach predetermined position, setting bridge plug of lighting a fire gives up, then above mentions perforation
Rifle plays perforation hole rifle, pressure break to predetermined position perforation；And so on, until carrying out all sections of pressing crack construction operation.
9. method according to claim 1 or 2, which is characterized in that correspond to first level well and the second water in straight well
The toe of horizontal well carries out perforation, and perforation is oriented parallel to the pit shaft direction of first level well and the second horizontal well.
10. method according to claim 1 or 2, which is characterized in that the discharge speed by the pit shaft of straight well is according to list
1.8-2.1 times of discharge speed needed for the single port horizontal well that the oil nozzle of saliva horizontal well is calculated.
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