CN109339745A - Shale gas reservoir recovery method based on optimal Area of a well - Google Patents
Shale gas reservoir recovery method based on optimal Area of a well Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/006—Production of coal-bed methane
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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Abstract
A kind of shale gas reservoir recovery method based on optimal Area of a well, the following steps are included: using staged fracturing horizontal wells shale gas reservoir, gas flows into crack from stratum, flows into horizontal wellbore from crack, and the corresponding relationship of gas output per well, cumulative production and time is calculated using Life cycle Dynamic Simulation Method.Change Area of a well by well control area width xe, specifies the corresponding relationship of different Area of a well Yu individual well cumulative gas production.Individual well cumulative production curve combination net present value (NPV) NPV model, obtains the corresponding relationship curve of different Area of a well Yu productivity effect relationship.According to productivity effect relation curve, best Area of a well is obtained using graphical method.Best Area of a well is further determined that in conjunction with work area area and opportunity cost, and shale gas reservoir exploitation is carried out according to best Area of a well.
Description
Technical field
The present invention relates to shale gas reservoir development fields, more particularly, to a kind of page based on optimal Area of a well
Rock gas reservoir exploitation method.
Background technique
Shale gas reservoir is a kind of continuous type gas mineral reserve, and essential characteristic is that distribution area is big, the variation of local geology condition
Not significant, exploitation is usually influenced by regional environment and geological conditions.For this feature, the development of shale gas reservoir
Mode integrally verifies+development technique breakthrough+step-by-step movement implementation.Once development technique makes a breakthrough, has the base of benefit exploitation
This condition, the investment of each well be substantially it is determining, the decision that at this moment operator is faced be how stepping and implementation issue.More
Specifically, the control area of distribution every mouth well is how, so that the reserves on per unit obtain utmostly
On utilization, obtain greatest benefit the problem of.
Therefore, in order to solve many insufficient and defects of the above-mentioned prior art, it is necessary to study a kind of based on optimal individual well
The shale gas reservoir recovery method of control area.
Summary of the invention
The present invention is completed in view of at least one above problem, the present invention passes through shale gas well control area and individual well
The corresponding relationship curve of cumulative gas production obtains Area of a well and Production Gain relation curve in conjunction with economic model, thus
Obtain the shale gas reservoir recovery method based on optimal Area of a well.
Specifically, according to an aspect of the present invention, a kind of shale gas reservoir exploitation based on optimal Area of a well is provided
Method, it is characterised in that the following steps are included:
A formation fracture dynamic parameter, including Number of Fractures n) are obtained using well testing, productivity testf, fracture length Lf, crack
Flow conductivity Fc, stratum inner region permeability Km1With stratum outskirt permeability Km2；
Stratum static parameter, including original formation pressure P are obtained using well log interpretation, static pressure testi, formation porosity
φm, horizontal well length DfAnd well control area width xeWith length ye；
Gas PVT parameter and youth's Ge Miaoer isothermal adsorption characteristics parameter are obtained using high pressure property and adsorption isotherm experiment
VLAnd PL；
B) the length y of fixed control areae, by changing width xeChange control plane product value, is measured in conjunction with step A)
Parameter determines the corresponding relationship of cumulative gas production and production time under different Area of a well by gas output per well model,
Obtain Area of a well-cumulative gas production relation curve；
C the corresponding relationship of net present value (NPV) NPV and production time under different Area of a well) are obtained by economic model,
In
Wherein, Gp,jFor the annual output in jth year, irFor Annual Percentage Rate, j is jth year, and n is the production cycle, and FC is fixed total throwing
Money, CwellFor individual well drilling cost, CfractureFor the main seam pressure break cost of single cluster, nfFor Number of Fractures；
D Area of a well and net present value (NPV) NPV relation curve and Area of a well and average list) are further obtained
Plane accumulates benefit NPVa relation curve；
NPVa=NPV/S
Determine Area of a well and increment benefit D relation curve,
D=dNPV/dS
It determines optimum efficiency point S2, makes to meet
dNPV/dS|S=s2=NPV/S |S=s2Or NPV/S |S=s2=Max
As S=S2, the obtained benefit of Area of a well is maximum, i.e. NPVa=K；When S is below or above S2, machine is defined
Meeting cost P,
P=K-NPVa
E work area area A) is measured, when A/S2 is integer, Area of a well takes S2；
When A/S2 is non-integer, being rounded to A/S2 is N, determines and is evenly arranged corresponding individual well when N mouthfuls of wells in the area A of work area
Corresponding Area of a well S2 "=A/ (N+1) when N+1 mouthfuls of wells is evenly arranged in control area S2 '=A/N, work area area A,
Determine that S takes S2 ' and S2 respectively according to NPVa=NPV/S ' when corresponding NPVa ' and NPVa ", according to P=K-NPVa
Determine the P ' and P " when NPVa takes NPVa ' and NPVa " respectively,
When P ' is less than or equal to P ", Area of a well S2 takes S2 ', and otherwise Area of a well S2 takes S2 "
F Area of a well) is set as S2, carries out shale gas reservoir exploitation.
Compared with prior art, the beneficial effects of the present invention are:
The present invention obtains the pass corresponding with the production time net present value (NPV) NPV under different Area of a well by economic model
System, and then obtain Area of a well and net present value (NPV) NPV relation curve and Area of a well and per unit benefit
NPVa relation curve determines the i.e. best Area of a well of optimum efficiency point S2, to provide foundation for shale gas reservoir exploitation.
Detailed description of the invention
Fig. 1 is that a kind of best Area of a well of the shale gas of preferred embodiment determines flow chart according to the present invention.
Fig. 2 is the staged fracturing horizontal well Production development under a kind of Area of a well of preferred embodiment according to the present invention
Physical model.
Fig. 3 is that cumulative production-time under a kind of different Area of a well of preferred embodiment according to the present invention is corresponding
Relational graph.
Area of a well and cumulative production pair under the different production times that Fig. 4 is a kind of preferred embodiment according to the present invention
Answer relational graph.
Fig. 5 is a kind of corresponding single hop crack overall cost of different pressure break length of preferred embodiment according to the present invention.
Fig. 6 is net present value (NPV)-time corresponding pass under a kind of different Area of a well of preferred embodiment according to the present invention
System's figure.
Area of a well is corresponding with net present value (NPV) under the different production times that Fig. 7 is a kind of preferred embodiment according to the present invention
Relational graph.
Fig. 8 is a kind of Area of a well of preferred embodiment and productivity effect graph of relation according to the present invention.
Fig. 9 is a kind of analysis chart of preferred embodiment order well Optimal Control area really according to the present invention.
Figure 10 is that a kind of well spacing of preferred embodiment and Area of a well, well spacing density conversion indicate according to the present invention
Example.
Figure 11 is a kind of typical well underlying parameter datatable example of preferred embodiment according to the present invention.
Figure 12 is a kind of schematic diagram of the opportunity cost of preferred embodiment according to the present invention.
Specific embodiment
With reference to the accompanying drawing, preferred forms of the invention, specific implementation here are described by preferred embodiment
Mode is to explain the present invention in detail, should not be construed as limiting the invention, and is not departing from spirit and reality of the invention
In the case where matter range, various changes and modifications can be made, these should all be included within protection scope of the present invention.
Embodiment 1
Referring to attached drawing 1-11, it is preferable that the present invention provides it is a kind of provide it is a kind of based on optimal Area of a well
Shale gas reservoir recovery method, it is characterised in that the following steps are included:
A formation fracture dynamic parameter, including Number of Fractures n) are obtained using well testing, productivity testf, fracture length Lf, crack
Flow conductivity Fc, stratum inner region permeability Km1With stratum outskirt permeability Km2；
Stratum static parameter, including original formation pressure P are obtained using well log interpretation, static pressure testi, formation porosity
φm, horizontal well length DfAnd well control area width xeWith length ye；
Gas PVT parameter and youth's Ge Miaoer isothermal adsorption characteristics parameter are obtained using high pressure property and adsorption isotherm experiment
VLAnd PL；
B) the length y of fixed control areae, by changing width xeChange control plane product value, is measured in conjunction with step A)
Parameter determines the corresponding relationship of cumulative gas production and production time under different Area of a well by gas output per well model,
Obtain Area of a well-cumulative gas production relation curve；
C the corresponding relationship of net present value (NPV) NPV and production time under different Area of a well) are obtained by economic model,
In
Wherein, Gp,jFor the annual output in jth year, irFor Annual Percentage Rate, j is jth year, and n is the production cycle, and FC is fixed total throwing
Money, CwellFor individual well drilling cost, CfractureFor the main seam pressure break cost of single cluster, nfFor Number of Fractures；
D Area of a well and net present value (NPV) NPV relation curve and Area of a well and average list) are further obtained
Plane accumulates benefit NPVa relation curve；
NPVa=NPV/S
Determine Area of a well and increment benefit D relation curve,
D=dNPV/dS
It determines optimum efficiency point S2, makes to meet
dNPV/dS|S=s2=NPV/S |S=s2Or NPV/S |S=s2=Max
As S=S2, the obtained benefit of Area of a well is maximum, i.e. NPVa=K；When S is below or above S2, machine is defined
Meeting cost P,
P=K-NPVa
E work area area A) is measured, when A/S2 is integer, Area of a well takes S2；
When A/S2 is non-integer, being rounded to A/S2 is N, determines and is evenly arranged corresponding individual well when N mouthfuls of wells in the area A of work area
Corresponding Area of a well S2 "=A/ (N+1) when N+1 mouthfuls of wells is evenly arranged in control area S2 '=A/N, work area area A,
Determine that S takes S2 ' and S2 respectively according to NPVa=NPV/S ' when corresponding NPVa ' and NPVa ", according to P=K-NPVa
Determine the P ' and P " when NPVa takes NPVa ' and NPVa " respectively,
When P ' is less than or equal to P ", Area of a well S2 takes S2 ', and otherwise Area of a well S2 takes S2 "
F Area of a well) is set as S2, carries out shale gas reservoir exploitation.
Preferably, control area is well control Area length and width xeProduct.
Preferably, gas output per well model specifically: according to physical model shown in Fig. 2, it is raw to construct Life cycle gas well
Dynamic mathematical models are produced, the parameter of step A) measurement/underlying parameter was substituted into mathematical model f (), gas well accumulation can be obtained
The corresponding relationship of yield G and time t.
Gp(t)=f (Km1,Km2,Lf,Fc,nf；xe,ye；φm,Pi；PVT parameter；VL,PL)
Advantageously, the present invention obtains net present value (NPV) NPV and production time under different Area of a well by economic model
Corresponding relationship, and then obtain Area of a well and net present value (NPV) NPV relation curve and Area of a well and mean unit face
Product benefit NPVa relation curve, determines the i.e. best Area of a well of optimum efficiency point S2, to mention for shale gas reservoir exploitation
For foundation.
Embodiment 2
Referring to Fig. 1-11, it is preferable that the shale gas reservoir exploitation based on optimal Area of a well that the present invention provides a kind of
Method illustrates implementation process by taking the typical development well of Sichuan Province China basin shale gas producing region mouthful as an example.Specifically, this method includes
Following steps:
It in step A), is tested and is tested using mining site and tested, obtained the well static geologic parameter accordingly, utilize pressure break
Construction and dynamic monitoring, obtain the corresponding dynamic project parameter of the well, specifically include:
A1 dynamic data) is obtained using well testing, productivity test, relevant stratum, crack dynamic parameter are obtained by analysis,
Including Number of Fractures nf, fracture length Lf, fracture condudtiviy Fc, stratum inner region permeability Km1With stratum outskirt permeability Km2；
A2 well log interpretation, static pressure test) are utilized, stratum static parameter, including original formation pressure P are obtained by analysisi、
Formation porosity φm, horizontal well length DfAnd the width x of well control areaeWith length ye。
A3 gas PVT parameter, youth's Ge Miaoer isothermal adsorption characteristics parameter) are obtained using high pressure property and adsorption isotherm experiment
VLAnd PL。
The above sound state Data Summary is in Figure 11.
In step B), fixed control area length, by changing control area width xeTo change control plane product value.It is excellent
Selection of land, ratio is set as constant I between fracture length and area width herex=Lf/xe.Control area is set in the present embodiment
xe=100~450m, corresponding fracture length Lf=80~360m, the underlying parameter provided in conjunction with step A) substitute into individual well and produce gas
Amount model is calculated.Fig. 3 reflects the corresponding relationship of cumulative production and production time under different Area of a well, individual well control
Area processed is bigger, and cumulative production is higher.Fig. 4 reflects the pass corresponding with cumulative production of Area of a well under the different production times
System, the production cycle is longer, and Area of a well influences cumulative production more significant.
In step C), economic model is introduced, wherein net present value (NPV) formula is such as:
Here, Gp,jFor the annual output in jth year, irFor Annual Percentage Rate, j is jth year, and n is the production cycle, and FC is fixed total throwing
It provides (equipment cost etc.), CwellFor individual well drilling cost, CfractureFor single cluster (main seam) pressure break cost, nfFor Number of Fractures.
In step C1), individual well overall cost (in addition to pressure break) is 40,000,000 yuan, Annual Percentage Rate 10%, gas price 1.2
Member/m3, the period is 20 years.The different exponential increases of pressure break length cost, such as Fig. 5.
In step C2), it is only existing that individual well is obtained according to the individual well cumulative production curve combination formula (1) provided in step B)
Value.Fig. 6 shows the corresponding relationship of net present value (NPV) and production time under different Area of a well, shorter for the production time, single
In the smaller situation of well control area, individual well net present value (NPV) will appear negative value.Fig. 7 shows Area of a well and list under different cycles
Well net present value (NPV) relationship.
In step D), best Area of a well is determined.
In step D1), Area of a well and productivity effect relation curve (curve 1 in Fig. 8) are obtained.
In step D2), Area of a well and per unit benefit (NPVa) relation curve are determined, i.e. scale is imitated
Answer (curve 2 in Fig. 8).
NPVa=NPV/S (2)
In step D3), Area of a well and increment benefit (D) relation curve are determined, i.e. edge effect is (bent in Fig. 8
Line 3).
D=dNPV/dS (3)
In step D4), breakeven point S1 (Fig. 9) is determined, be to meet
NPV|S=s1=0 or NPVa |S=s1=0 (4)
This is Area of a well lowest limit, and individual well Production Gain will not support investment when being lower than this value.
In step D5), determines optimum efficiency point S2 (Fig. 9), make to meet
dNPV/dS|S=s2=NPV/S |S=s2Or NPV/S |S=s2=Max (5)
S2 is determined as best Area of a well.
E Area of a well) is set as S2, carries out shale gas reservoir exploitation.
Preferably, as S=S2, the obtained benefit of Area of a well is maximum, i.e. NPVa=K, when S is below or above S2
When, actual benefit is below this value.Referring to Figure 12, opportunity cost P is determined, define
P=K-NPVa (6)
Then P can measure the size of opportunity cost.Its meaning is the probable lost revenue when S value deviates optimal value.Its
Chance is, if having an opportunity to supply insufficient area or being used to the area for being more than beat new well, can obtain more effects
Benefit.The difference of this better benefit and actual benefit is exactly probable opportunity loss.For continuity oil reservoir, such chance
It is existing for reality, it is probable just to become inevitable.It, can according to P value to the sensibility and P value of S in the asymmetry of S2 point two sides
Effectively to instruct decision process.
Preferably, work area area A is measured, when A/S2 is integer, Area of a well takes S2；
When A/S2 is non-integer, being rounded to A/S2 is N, determines and is evenly arranged corresponding individual well when N mouthfuls of wells in the area A of work area
Corresponding Area of a well S2 "=A/ (N+1) when N+1 mouthfuls of wells is evenly arranged in control area S2 '=A/N, work area area A,
Determine that S takes S2 ' and S2 respectively according to NPVa=NPV/S ' when corresponding NPVa ' and NPVa ", according to P=K-NPVa
Determine the P ' and P " when NPVa takes NPVa ' and NPVa " respectively,
When P ' is less than or equal to P ", Area of a well S2 takes S2 ', and otherwise Area of a well S2 takes S2 ".
Embodiment 3
Preferably, the present invention provides a kind of shale gas reservoir recovery method based on optimal Area of a well, this method
The following steps are included:
Step A), according to fig. 2 in physical model, using staged fracturing horizontal wells shale gas reservoir, gas is from stratum
It flows into crack, flow into horizontal wellbore from crack.Gas output per well, cumulative production are calculated using Life cycle Dynamic Simulation Method
With the corresponding relationship of time.
Step B), the present invention changes Area of a well by well control area width xe, specifies different single well-controlled faces
The long-pending corresponding relationship with individual well cumulative gas production.Well control area width (i.e. corresponding well away from) and Area of a well, well spacing density
Transformational relation is summarised in Figure 10.
Step C), individual well cumulative production curve combination net present value (NPV) NPV model, obtains different Area of a well and production is imitated
The corresponding relationship curve of beneficial relationship.The corresponding pressure break cost of difference Area of a well is different in net present value model.
Step D), according to productivity effect relation curve, best Area of a well and/or corresponding is obtained using graphical method
Best techniques parameter.
In conclusion the beneficial effects of the present invention are:
The present invention obtains the pass corresponding with the production time net present value (NPV) NPV under different Area of a well by economic model
System, and then obtain Area of a well and net present value (NPV) NPV relation curve and Area of a well and per unit benefit
NPVa relation curve determines the i.e. best Area of a well of optimum efficiency point S2, to provide foundation for shale gas reservoir exploitation.
The present invention is not limited to above-mentioned specific embodiments.It is understood that not departing from spirit and substance of the present invention model
In the case where enclosing, various changes and modifications can be made, these should all be included within protection scope of the present invention.
Claims (2)
1. a kind of shale gas reservoir recovery method based on optimal Area of a well, it is characterised in that the following steps are included:
A formation fracture dynamic parameter, including Number of Fractures n) are obtained using well testing, productivity testf, fracture length Lf, fracture guide
Ability Fc, stratum inner region permeability Km1With stratum outskirt permeability Km2；
Stratum static parameter, including original formation pressure P are obtained using well log interpretation, static pressure testi, formation porosity φm, water
Horizontal well length DfAnd well control area width xeWith length ye；
Gas PVT parameter and youth's Ge Miaoer isothermal adsorption characteristics parameter V are obtained using high pressure property and adsorption isotherm experimentLWith
PL；
B) the length y of fixed control areae, by changing width xeChange control plane product value, the parameter measured in conjunction with step A)
By gas output per well model, the corresponding relationship of cumulative gas production and production time under different Area of a well is determined, obtain
Area of a well-cumulative gas production relation curve；
C the corresponding relationship of net present value (NPV) NPV and production time under different Area of a well) are obtained by economic model, wherein
Wherein, Gp,jFor the annual output in jth year, irFor Annual Percentage Rate, j is jth year, and n is the production cycle, and FC is fixed gross investment,
CwellFor individual well drilling cost, CfractureFor the main seam pressure break cost of single cluster, nfFor Number of Fractures；
D Area of a well and net present value (NPV) NPV relation curve and Area of a well and mean unit face) are further obtained
Product benefit NPVa relation curve；
NPVa=NPV/S
Determine Area of a well and increment benefit D relation curve,
D=dNPV/dS
It determines optimum efficiency point S2, makes to meet
dNPV/dS|S=s2=NPV/S |S=s2Or NPV/S |S=s2=Max
As S=S2, the obtained benefit of Area of a well is maximum, i.e. NPVa=K；When S be below or above S2 when, define chance at
This P,
P=K-NPVa
E work area area A) is measured, when A/S2 is integer, Area of a well takes S2；
When A/S2 is non-integer, being rounded to A/S2 is N, determines and is evenly arranged corresponding single well-controlled when N mouthfuls of wells in the area A of work area
Corresponding Area of a well S2 "=A/ (N+1) when N+1 mouthfuls of wells is evenly arranged in area S2 '=A/N, work area area A,
Determine that S takes S2 ' and S2 respectively according to NPVa=NPV/S ' when corresponding NPVa ' and NPVa ", determined according to P=K-NPVa
NPVa takes the P ' and P " when NPVa ' and NPVa " respectively,
When P ' is less than or equal to P ", Area of a well S2 takes S2 ', and otherwise Area of a well S2 takes S2 "
F Area of a well) is set as S2, carries out shale gas reservoir exploitation.
2. according to the method described in claim 1, it is characterized by: Area of a well is equal to well control Area length and width
Product.
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