CN110145286A - A kind of design method of low-permeability oil deposit or gas reservoir Well Completion Engineering of Oil Reservoirs - Google Patents
A kind of design method of low-permeability oil deposit or gas reservoir Well Completion Engineering of Oil Reservoirs Download PDFInfo
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- CN110145286A CN110145286A CN201910428232.XA CN201910428232A CN110145286A CN 110145286 A CN110145286 A CN 110145286A CN 201910428232 A CN201910428232 A CN 201910428232A CN 110145286 A CN110145286 A CN 110145286A
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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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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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
- E21B47/00—Survey of boreholes or 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
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
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Abstract
The present invention provides the design methods of a kind of low-permeability oil deposit or gas reservoir Well Completion Engineering of Oil Reservoirs, are related to petroleum gas field of engineering technology, include the following steps: to construct rock strength section；Construct critical producing pressure drop model；Determine completion methods of horizontal wells.The present invention provides the design method of low-permeability oil deposit Well Completion Engineering of Oil Reservoirs, this method Logging information and laboratory experiment form a kind of low-permeability oil deposit or Horizontal Wells For Gas Reservoirs completion mode preferred method, are conducive to the high-efficiency mining of reservoir hydrocarbons resource.The method forms the completion methods of horizontal wells optimization method of system, can be improved the standard well capacity and service life using this method.
Description
Technical field
The present invention relates to petroleum gas field of engineering technology, complete in particular to a kind of low-permeability oil deposit or gas reservoir
The design method of well engineering.
Background technique
Low-permeability oil deposit and gas reservoir are one of the primary positions of China's exploration and development from now on.Low Permeability Oil/gas ensconces oil gas money
Proportion is increasing in source, is increasingly becoming the major fields of global Oil Gas exploitation.In Low permeable oil and gas reservoirs, China is hypotonic
Saturating sandstone reservoirs are resourceful, are a major fields of current natural gas exploitation.The exploitation of low permeability gas reservoirs at present, it is more
Using well stimulations exploitations such as horizontal well cooperation acidification, pressure breaks, and the superiority and inferiority of horizontal well completion method directly affects gas well deliverability
And the service life.Low-permeability oil deposit has the feature of strong reservoir lithology heterogeneity, microcrack development, oil water relation complexity, and uses
The drawback that traditional completion methods of horizontal wells exploitation low-permeability oil deposit based on homogeneous reservoir has production efficiency low, is unfavorable for
The development and utilization of low-permeability oil deposit.Therefore, reasonable completion methods of horizontal wells is selected to be particularly important.Completion mode and oil gas
It is related to hide the factors such as tectonic geology feature, reservoir rock and physical properties of fluids, drilling technique, volume increase needs, wellbore stability, it is existing
There is technology to be difficult to take into account various influence factors, there is certain unicity.In addition, the prior art is when selecting completion mode, piece
Face or similar experience account for leading role.
Summary of the invention
The purpose of the present invention is to provide the design method of a kind of low-permeability oil deposit or gas reservoir Well Completion Engineering of Oil Reservoirs, this method is comprehensive
Well-log information and laboratory experiment form a kind of low-permeability oil deposit or Horizontal Wells For Gas Reservoirs completion mode preferred method.Since well logging provides
Material reflects the feature of the deep reservoirs such as heterogeneous, the grease characteristic in stratum, so as to more accurate to horizontal well completion side
Formula carries out preferably, being conducive to the high-efficiency mining of reservoir hydrocarbons resource.
The present invention is implemented as follows:
The design method of a kind of low-permeability oil deposit or gas reservoir Well Completion Engineering of Oil Reservoirs includes the following steps: to construct rock strength section；
Construct critical producing pressure drop model；Determine completion methods of horizontal wells.
In the present invention using in preferred embodiment, above-mentioned rock strength section is based on Sonic Logging Data and indoor rock
Heart experiment parameter is built-up.
In the present invention using in preferred embodiment, above-mentioned laboratory core experiment parameter include petrophysics experiment parameter and
Rock Mechanics Test parameter, petrophysics experiment parameter include the P-wave And S time difference of rock, and Rock Mechanics Test parameter includes pair
The rock sample of acid solution before and after the processing carries out the resulting compressive strength of rock of rock sample experiment of machanics, cohesive force and internal friction angle.At acid solution
The mode of reason includes any one acid solution processing side that acid soak, acid cycle displacement and acid cycle are crossed in rock core end face
Formula.
Further, it needs to be acquired the underground rock core in work area before testing rock sample, and to rock core according to phase
It closes professional standard and carries out sample preparation.Using Method of Ultrasonic Penetration, the rock P-wave And S time difference is obtained；Using indoor triaxial compressions method, obtain
Obtain compressive strength of rock, cohesive force and internal friction angle mechanics parameter.
Further, after carrying out acid solution processing to rock sample, using indoor triaxial compressions method, analysis acidification is to rock mechanics spy
The influence of sign, including compressive strength of rock, cohesive force and the internal friction angle mechanics parameter after acidification, the acid solution mode of action includes acid
The modes such as liquid immersion, acid cycle displacement, the acid solution mode of action and acid solution action time are determines according to actual conditions.
It is applied in preferred embodiment in the present invention, the computation model of above-mentioned rock strength parameter are as follows:
In above formula: ScFor compression strength, MPa；For internal friction angle, °；C is cohesive force, MPa；AC is interval transit time, us/
m。
Further, related to rock mechanics parameters (compression strength, cohesive force and internal friction angle) based on interval transit time
Property, obtain rock strength section.
It is applied in preferred embodiment in the present invention, it is above-mentioned that earth bore is obtained by Eaton method using Sonic Logging Data
The distribution of gap pressure, the accounting equation of Eaton method are as follows:
In formula: PpFor pore pressure grad, g/cm3；GoFor overburden pressure gradient, g/cm3； GnFor hydrostatic fluid column pressure
Force gradient, g/cm3；ACnFor the interval transit time in normal compaction trend line, us/m；AC is well logging sonic differential time, us/m；C is pressure
Real exponent.
In the present invention using in preferred embodiment, further includes the acid fracturing construction curve based on drilling well, calculate and obtain structure
The coefficient of strain is made, to obtain the crustal stress Distribution Value in research work area.
Further, the model for calculating reservoir stress includes Matthews&Kelly model, Eaton model, Anderson
Any one in model, Newberry model, cluster spring model and Huang Shi model, preferably cluster spring model are as follows
Shown in formula:
In formula: μ: Poisson's ratio；α: biots coefficient；E: elastic modulus of rock, MPa；εH、εh: along biggest principal stress direction with
The minimum principal stress directional structure vectorical structure coefficient of strain, H0: well logging end point depth, m；ρ (H): depth is the well logging density of H point, g/cm3；
G: acceleration of gravity, kg.m/s2。
Eaton method is primarily adapted for use in sand-shale sequence stratum.The principle of this method be compacted observed parameter actual value and
The ratio of normal trend value and the relationship of strata pressure are determined by the variation of burden pressure gradient.
Further, the calculation method of formation pore pressure distribution can also be equivalent depth method.Equivalent depth method is assumed
Different depth has effective stress suffered by the same class mud stone of identical rock physical property equal, is not considering temperature shadow
In the case where sound, if depth H2Abnormal pressure point interval transit time and normal trend line on H1The interval transit time of point is equal, then instead
It is identical to reflect this two o'clock compaction, two o'clock has equivalence, claims H1For H2Equivalent depth point (He), the purpose of different depth section
Layer formation pore pressure PpIt can be calculated by following formula:
Pp=G0H-(G0-Gn)He
In formula, G0、Gn、H、HeRespectively overburden pressure gradient, Hydrostatic pressure gradient, formation at target locations depth, equivalent depth
Degree.
In the present invention using in preferred embodiment, above-mentioned building critical producing pressure drop model is joined based on stone mechanical strength
Number cohesive force and internal friction angle, pore pressure distribution, crustal stress distribution, using a mole coulomb criterion, obtain different well tracks
Under caving pressure, thus rational judgment borehole wall stability.
It is applied in preferred embodiment in the present invention, the calculation method of above-mentioned caving pressure are as follows:
Whereinζ0For failure mechanics and σ1Angle, Co、For matrix cohesive force and internal friction angle, pwTo face
Boundary destroys head of liquid, as formation collapsed pressure, MPa；σzFor borehole wall vertical stress, MPa；σθFor borehole wall circumferential stress, MPa；
τθzFor borehole wall shear stress, MPa.
Further, shown in caving pressure calculation method such as formula (3).Caving pressure is higher, shows that the borehole wall more easily collapses, i.e.,
Borehole wall stability is poor.
In preferred embodiments of the present invention, above-mentioned acquisition rock mechanics parameters include carrying out rock to the Rock in Well of acquisition
Stone experiment of machanics, Rock Mechanics Test include indoor triaxial compressions method, Brazilian split the law, and it is anti-to obtain tensile strength of rock, rock
Compressive Strength, cohesive force and internal friction angle mechanics parameter.
The underground rock core that work area is selected when rock acquires carries out sample preparation according to relevant industries standard to rock core.
In preferred embodiments of the present invention, above-mentioned Rock Mechanics Test is carried out after carrying out acid solution processing to Rock in Well
Rock Mechanics Test.
In the present invention using in preferred embodiment, critical producing pressure drop, calculating side are obtained by critical producing pressure drop model
Method are as follows:
Δ P=pp-pw。
In the present invention using in preferred embodiment, according to critical producing pressure drop model, obtain under pressure failure effect
Critical producing pressure drop further analyzes the critical producing pressure drop under acidification, comprehensive pressure failure and facing under acidification
Boundary's producing pressure differential, determines completion methods of horizontal wells.
Further, completion methods of horizontal wells preferred method provided by the present invention is also applied for without acidification
Low-permeability oil deposit or gas reservoir.Acidification is not considered when using the preferred method for such oil reservoir or gas reservoir.
In preferred embodiments of the present invention, the optimization method of above-mentioned low-permeability oil deposit or Horizontal Wells For Gas Reservoirs completion mode is also
Including horizontal well sand prediction, horizontal well sand prediction is by formation pore pressure, stratum crustal stress and rock mechanics parameters
It is analyzed, and considers pressure-break and acidification.According to compressive strength of rock under producing pressure differential rock of borehole held
The relationship between tangential crustal stress received, comes whether rational judgment stratum shakes out.For horizontal well, sand entry is according to following institute
Show:
In formula: σcFor compressive strength of rock, MPa；PwfFlowing bottomhole pressure (FBHP) when to produce, the critical well when stratum shakes out
Underflow pressure is critical pressure of shaking out, MPa.
In preferred embodiments of the present invention, above-mentioned productivity prediction model considers the skin factor under different completion modes
Different influences, and productivity prediction model is constructed based on this.
In preferred embodiments of the present invention, above-mentioned productivity prediction model includes following prediction model:
Open hole completion of horizontal well:
The complete well of horizontal well slotted liner:
The complete well of SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL:
The complete well of horizontal well perforation:
Wherein,
In above formula: KhIt is reservoir-level to permeability, 10-3·um-2；T is reservoir temperature, DEG C；Z is natural gas deviation system
Number；H is reservoir thickness, m；L is horizontal well length, m；β is Reservoir anisotropy coefficient；rwFor wellbore radius, m；δ is horizontal well
Eye eccentricity, m.ugFor gas viscosity, cP；rehFor drainage radius, m.Soh,Ssp,Sogf,ShorRespectively open hole completion of horizontal well,
The complete well of slotted liner, gravel pack completion, perforation completion skin factor.AaFor horizontal productivity, all places/day.
Finally, the borehole wall stability of integrated water horizontal well, situation of shaking out, production capacity, preferably completion mode are from existing complete well side
It is selected in formula.The borehole wall is most stable, shakes out minimum, and the maximum completion mode of production capacity is optimal.Based on this, it is complete to obtain horizontal well
The complex optimum equation of well mode, as follows:
In above formula: D completion mode optimal coefficient；PcFor the maximum caving pressure in all completion modes, MPa；PciIt is i-th
The caving pressure of a completion mode, MPa；PwfmFor critical pressure of shaking out maximum in all completion modes, MPa；PwfiIt is i-th
The critical pressure of shaking out of completion mode, MPa；AaxFor the maximum production capacity in all completion modes, all places/day；AaiI-th of complete well
The production capacity of mode, all places/day.
The beneficial effect comprise that the present invention provides the design methods of low-permeability oil deposit or gas reservoir Well Completion Engineering of Oil Reservoirs.
This method Logging information and laboratory experiment form a kind of low-permeability oil deposit or Horizontal Wells For Gas Reservoirs completion mode preferred method.
Since well-log information reflects the deep reservoirs features such as heterogeneous, the grease characteristic in stratum, so as to more accurate to level
Well completion mode carries out preferably, being conducive to the high-efficiency mining of reservoir hydrocarbons resource, and being drilled well engineering design to scene has reality
Meaning.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 is implementing procedure frame diagram of the invention；
Fig. 2 is compressive strength of rock and interval transit time correlation；
The position Fig. 3 rock cohesive force and interval transit time correlation；
The position Fig. 4 internal friction angle of rock and interval transit time correlation；
Fig. 5 is work area rock strength sectional view；
Fig. 6 is the critical producing pressure drop under pressure failure；
Fig. 7 is the rock strength under acidification；
Fig. 8 is the critical producing pressure drop of F1 well；
Fig. 9 is the critical producing pressure drop of F2 well；
Figure 10 is the critical producing pressure drop of L1 well；
Figure 11 is the process frame diagram of the embodiment of the present invention 2；
Figure 12 is 2 work area pore pressure distribution map of embodiment；
Figure 13 is the distribution of 2 work area crustal stress of embodiment；
Figure 14 is the wellbore model in the presence of 2 pressure-break of embodiment；
Figure 15 is the preferred completion mode figure of embodiment 2.
Specific embodiment
It in order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below will be in the embodiment of the present invention
Technical solution be clearly and completely described.The person that is not specified actual conditions in embodiment, according to normal conditions or manufacturer builds
The condition of view carries out.Reagents or instruments used without specified manufacturer is the conventional production that can be obtained by commercially available purchase
Product.
Feature and performance of the invention are described in further detail with reference to embodiments.
Embodiment 1
The design method of low-permeability oil deposit Well Completion Engineering of Oil Reservoirs provided in this embodiment, the design method referring to Fig.1 shown in flow
Cheng Tu, including the following steps successively carried out:
(1) Method of Ultrasonic Penetration is used, the P-wave And S time difference of rock is obtained；
(2) using indoor triaxial compressions method, cohesive force, internal friction angle and the compression strength mechanics parameter of rock are obtained；
(3) acid cycle is carried out to rock sample and crosses rock core end face, using indoor triaxial compressions method, analysis acidification is to rock mechanics
The influence of feature, including rock cohesive force, internal friction angle and the compression strength mechanics parameter after acidification.
(4) it is tested based on the transmission ultrasonic wave in step (1) and step (2) and triaxial compressions experiment of machanics is as a result, obtain
Laboratory core experiment parameter, building interval transit time are related to rock mechanics parameters (compression strength, cohesive force, internal friction angle)
Property, referring to shown in Fig. 2-Fig. 4.
By the available rock mechanics parameters logging prediction of correlation of interval transit time in Fig. 2-Fig. 4 and rock mechanics parameters
Model, rock strength parameter computation model include:
In above formula: ScFor compression strength, MPa；For internal friction angle, °；C is cohesive force, MPa；AC is interval transit time, us/
m。
Based on the available rock strength section of the prediction model, referring to Figure 5.
(4) stratum sound wave measuring well curve is utilized, formation pore pressure distribution, the calculating of Eaton method are obtained by Eaton method
Equation are as follows:
In formula: PpFor pore pressure grad, g/cm3；GoFor overburden pressure gradient, g/cm3； GnFor hydrostatic fluid column pressure
Force gradient, g/cm3；ACnFor the interval transit time in normal compaction trend line, us/m；AC is well logging sonic differential time, us/m；C is pressure
Real exponent.
(5) based on the acid fracturing hydraulic fracture operating curve of drilling well, by cluster spring model referring to shown in formula (4) and formula (5),
Construct reasonable crustal stress computation model.Crustal stress data based on multiple wells test point are managed by means of mathematics and rock mechanics
By numerical simulation back analysis is carried out, calculates and obtain tectonic strain coefficient, to construct the computation model of work area crustal stress.
In formula: μ: Poisson's ratio；α: biots coefficient；E: elastic modulus of rock, MPa；εH、εh: along biggest principal stress direction with
The minimum principal stress directional structure vectorical structure coefficient of strain, H0: well logging end point depth, m；ρ (H): depth is the well logging density of H point, g/cm3；
G: acceleration of gravity, kg.m/s2。
(6) it based on rock mechanics intensive parameter (cohesive force and internal friction angle), pore pressure distribution, crustal stress distribution, adopts
With a mole coulomb criterion, the caving pressure under different well tracks is obtained, thus rational judgment borehole wall stability.
The calculation method of caving pressure are as follows:
Whereinζ0For failure mechanics and σ1Angle, Co、For matrix cohesive force and internal friction angle.pwTo face
Boundary destroys head of liquid, as formation collapsed pressure, MPa；σzFor borehole wall vertical stress, MPa；σθFor borehole wall circumferential stress, MPa；
τθzFor borehole wall shear stress, MPa.
Caving pressure is higher, shows that the borehole wall more easily collapses, i.e., borehole wall stability is poor.
Critical producing pressure drop (Δ P) is obtained by critical producing pressure drop model, calculation method are as follows:
Δ P=pp-pw。
(7) it is based on critical producing pressure drop algorithm, strata pressure failure function influence is considered, obtains under Different Strata pressure
Critical producing pressure drop, referring to shown in Fig. 6.
(8) it is tested based on laboratory core, experiment of machanics is carried out to acid treated rock core, it is strong to rock to obtain acidification
The influence size of degree, referring to shown in Fig. 7.On this basis, using critical producing pressure drop algorithm, facing under acidification can be obtained
Boundary's producing pressure differential.
(9) horizontal well under acidification and strata pressure failure is obtained according to critical producing pressure drop in step (8) and step (7)
Critical producing pressure drop, to carry out horizontal well completion optimization.
Referring to shown in Fig. 8-Figure 10, to illustrate this method practicability, critical producing pressure drop is carried out to tri- mouthfuls of wells of F1, F2 and L1
Analysis.From Fig. 8-Figure 10: for F1 well, since acidification is affected to horizontal segment rock strength, therefore entire horizontal segment
Critical producing pressure drop is greatly lowered, and maximum fall reaches 12MPa, and entire well section all must be using the complete well side of support
Formula；After the net horizontal section acidification of F2 well and L1 well, compared with the net horizontal section under prime stratum intensity, entire net horizontal section
Critical producing pressure drop be greatly lowered, maximum has decreased by 15MPa, and all oil-containing intervals no longer have naked eye production
Condition, it is proposed that use the slotted liner with external packer of pipe or perforation completion mode.
Embodiment 2
The optimization method of low permeability gas reservoir completion methods of horizontal wells provided in this embodiment, referring to Fig.1 process shown in 1
Figure, including the following steps successively carried out:
(1) using indoor triaxial compressions method and Brazilian split the law, tensile strength of rock, compressive strength of rock, cohesion are obtained
Power and internal friction angle mechanics parameter；
(2) acid soak processing is carried out to rock sample, using indoor triaxial compressions method, analysis acidification is to rock-mechanics property
It influences, including compressive strength of rock, cohesive force and the internal friction angle mechanics parameter after acidification.Test result is referring to shown in table 1:
The rock sample mechanics parameter variation of the acidification of table 1 front and back
| Rock mechanics parameters | Before acidification | After acidification |
| Uniaxial compressive strength | 177.3MPa | 152.8MPa |
| Rock cohesive force | 31.2MPa | 33.22MPa |
| Internal friction angle of rock | 32.51° | 25.83° |
(3) stratum sound wave measuring well curve is substituted into formula (2),
Obtain formation pore pressure distribution Pp.Formation pore pressure distribution referring to Fig.1 2
It is shown.
(4) crustal stress computation model is constructed, the crustal stress data of multiple wells test point are calculated by formula (4) and formula (5)
Construct crustal stress computation model.Crustal stress distribution is referring to Fig.1 shown in 3.
In formula: μ: Poisson's ratio；A:biots coefficient；E: elastic modulus of rock, MPa；εH、εh: along biggest principal stress direction with
The minimum principal stress directional structure vectorical structure coefficient of strain, H0: well logging end point depth, m；ρ (H): depth is the well logging density of H point, g/cm3；
G: acceleration of gravity, kg.m/s2。
(5) in the presence of using finite element software building pressure-break, the wellbore model of different completion modes, 4 institute referring to Fig.1
Show, obtains pit shaft Rock Mass Stability property coefficient cloud atlas.
(6) based on stone mechanical strength parameter, pore pressure distribution, crustal stress distribution, consider acidification and pressure-break shadow
It rings, using a mole coulomb criterion, the caving pressure under different well tracks is obtained, to obtain borehole wall stability.Caving pressure
Shown in calculation method such as formula (3).Caving pressure is higher, shows that the borehole wall more easily collapses, i.e., borehole wall stability is poor.
Whereinζ0For failure mechanics and σ1Angle, Co、For matrix cohesive force and internal friction angle.pwTo face
Boundary destroys head of liquid, as formation collapsed pressure, MPa；σzFor borehole wall vertical stress, MPa；σθFor borehole wall circumferential stress, MPa；
τθzFor borehole wall shear stress, MPa.
(7) it is distributed by rock mechanics intensive parameter and strata pressure, considers that acidification and pressure-break influence, using power
Analytic approach, foundation compressive strength of rock and the relationship between the tangential crustal stress that rock of borehole under producing pressure differential is born,
Come whether rational judgment stratum shakes out.For horizontal well, sand entry is according to as follows:
In formula: σcFor compressive strength of rock, MPa；PwfFlowing bottomhole pressure (FBHP) when to produce, the critical well when stratum shakes out
Underflow pressure is critical pressure of shaking out, MPa.
(8) influence for considering the skin factor under different completion modes, constructs the capability forecasting mould under different completion modes
Type obtains corresponding horizontal productivity.
Open hole completion of horizontal well:
The complete well of horizontal well slotted liner:
The complete well of SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL:
The complete well of horizontal well perforation:
Wherein,
In above formula: KhIt is reservoir-level to permeability, 10-3·um-2；T is reservoir temperature, DEG C；Z is natural gas deviation system
Number；H is reservoir thickness, m；L is horizontal well length, m；β is Reservoir anisotropy coefficient；rwFor wellbore radius, m；δ is horizontal well
Eye eccentricity, m.ugFor gas viscosity, cP；rehFor drainage radius, m.Soh,Ssp,Sogf,ShorRespectively open hole completion of horizontal well,
The complete well of slotted liner, gravel pack completion, perforation completion skin factor.AaFor horizontal productivity, all places/day.
(9) 4 kinds of completion mode optimal coefficients are obtained by formula (11), referring to Fig.1 shown in 5, perforation completion optimal coefficient is most
Greatly, exploitation of the present embodiment selective perforation completion mode most beneficial for the reservoir hydrocarbons.
The beneficial effect comprise that the present invention provides the optimization methods of low permeability gas reservoir completion methods of horizontal wells.
This method integrated reservoir geologic feature is drilled well engineering parameter and horizontal productivity, forms the horizontal well completion of set of system
Method optimizing method.This method can preferably be most suitable for the completion mode of reservoir, be conducive to store up from existing level well completion mode
The high-efficiency mining of layer petroleum resources is drilled well engineering design with practical significance to scene.
A kind of program of the optimization method of low permeability gas reservoir completion methods of horizontal wells, is worked out using Java language, is compiled
Thinking processed includes the following steps:
(1) borehole wall stability prediction is carried out according to reservoir rock mechanics essential characteristic parameter；
(2) sand prediction is carried out according to the essential characteristics parameter such as reservoir rock mechanics, acoustics for the reservoir that needs are acidified；
(3) according to the prediction result of geologic characteristics and exploitation feature combination step (1) and step (2), to complete well side
Method carries out primary election；
(4) skin factor and AOF calculation parameter setting are carried out to the completion method selected；
(5) primary election completion method production capacity, preferably completion method are calculated.
The beneficial effect comprise that the present invention provides the design methods of low-permeability oil deposit or gas reservoir Well Completion Engineering of Oil Reservoirs.
This method Logging information and laboratory experiment form a kind of low-permeability oil deposit or Horizontal Wells For Gas Reservoirs completion mode preferred method.
Since well-log information reflects the deep reservoirs features such as heterogeneous, the grease characteristic in stratum, so as to more accurate to level
Well completion mode carries out preferably, being conducive to the high-efficiency mining of reservoir hydrocarbons resource, and being drilled well engineering design to scene has reality
Meaning.
The foregoing is merely the preferred embodiment of the present invention, are not intended to restrict the invention, for this field
For technical staff, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any
Modification, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. the design method of a kind of low-permeability oil deposit or gas reservoir Well Completion Engineering of Oil Reservoirs, which comprises the steps of: building rock
Intensity section；Construct critical producing pressure drop model；Determine completion methods of horizontal wells.
2. the design method of low-permeability oil deposit according to claim 1 or gas reservoir Well Completion Engineering of Oil Reservoirs, which is characterized in that the rock
Stone intensity section is built-up based on Sonic Logging Data and laboratory core experiment parameter.
3. the design method of low-permeability oil deposit according to claim 2 or gas reservoir Well Completion Engineering of Oil Reservoirs, which is characterized in that the room
Interior core experiment parameter includes petrophysics experiment parameter and Rock Mechanics Test parameter, and the petrophysics experiment parameter includes
The P-wave And S time difference of rock, the Rock Mechanics Test parameter include that rock sample carries out rock sample experiment of machanics before and after the processing to acid solution
Resulting compressive strength of rock, cohesive force and internal friction angle.
4. the design method of low-permeability oil deposit according to claim 2 or gas reservoir Well Completion Engineering of Oil Reservoirs, which is characterized in that the rock
Stone intensive parameter computation model includes:
In above formula: ScFor compression strength, MPa；For internal friction angle, °；C is cohesive force, MPa；AC is interval transit time, us/m.
5. the design method of low-permeability oil deposit according to claim 2 or gas reservoir Well Completion Engineering of Oil Reservoirs, which is characterized in that utilize institute
It states Sonic Logging Data and formation pore pressure distribution, the accounting equation of the Eaton method is obtained by Eaton method are as follows:
In formula: PpFor pore pressure grad, g/cm3；GoFor overburden pressure gradient, g/cm3；GnFor hydrostatic head of liquid ladder
Degree, g/cm3；ACnFor the interval transit time in normal compaction trend line, us/m；AC is well logging sonic differential time, us/m；C is that compacting refers to
Number.
6. the design method of low-permeability oil deposit according to claim 2 or gas reservoir Well Completion Engineering of Oil Reservoirs, which is characterized in that further include
Acid fracturing hydraulic fracture operating curve based on drilling well calculates and obtains tectonic strain coefficient, obtains the crustal stress Distribution Value in research work area.
7. the design method of low-permeability oil deposit according to claim 1 or gas reservoir Well Completion Engineering of Oil Reservoirs, which is characterized in that the structure
Building critical producing pressure drop model is based on stone mechanical strength parameter cohesive force and internal friction angle, pore pressure distribution, crustal stress point
Cloth obtains the caving pressure under different well tracks using a mole coulomb criterion, and considers pressure-break and acidification, thus
It can rational judgment borehole wall stability.
8. the design method of low-permeability oil deposit according to claim 7 or gas reservoir Well Completion Engineering of Oil Reservoirs, which is characterized in that described to collapse
The calculation method for pressure of collapsing are as follows:
Whereinζ0For failure mechanics and σ1Angle, Co、For matrix cohesive force and internal friction angle, pwIt is critical broken
Bad head of liquid, as formation collapsed pressure, MPa；σzFor borehole wall vertical stress, MPa；σθFor borehole wall circumferential stress, MPa；τθz
For borehole wall shear stress, MPa.
9. the design method of low-permeability oil deposit according to claim 7 or gas reservoir Well Completion Engineering of Oil Reservoirs, which is characterized in that by described
Critical producing pressure drop model obtains critical producing pressure drop, calculation method are as follows:
Δ P=pp-pw。
10. the design method of low-permeability oil deposit according to claim 7 or gas reservoir Well Completion Engineering of Oil Reservoirs, which is characterized in that according to
The critical producing pressure drop model obtains the critical producing pressure drop under pressure failure effect, further analyzes under acidification
Critical producing pressure drop under critical producing pressure drop, comprehensive pressure failure and acidification, determines completion methods of horizontal wells.
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