CN106204304A - A kind of Conglomerate Reservoir gathers the determination method driving permeability saturation curve - Google Patents

Abstract

The invention provides a kind of Conglomerate Reservoir and gather the determination method driving permeability saturation curve, comprise the following steps: (1) calculates poly-displacement of reservoir oil well composite water cut f_w；(2) one-level linear fit relational expression y is set up₁=ax+b, it is thus achieved that fitting parameter a, b；(3) relative permeability is utilized to drive water saturation relational expression with poly-Calculate and different gathering drive water saturation S_wUnder poly-drive oil-water relative permeability ratio value(4) two grades of linear fit relational expressions y are set up₂=k₁x₁+k₂x₂+k₃, it is thus achieved that fitting parameter k₁、k₂And k₃；(5) calculating is poly-drives different water cut saturation S_wUnder water-oil phase relative permeability K_ro、K_rw；(6) drafting is poly-drives water-oil phase permeability saturation curve.Conglomerate Reservoir of the present invention gathers the determination method driving permeability saturation curve, can quickly obtain the poly-permeability saturation curve that drives of more accurate Conglomerate Reservoir, and low cost, efficiency is high, greatly reduces workload.

Description

A kind of Conglomerate Reservoir gathers the determination method driving permeability saturation curve

Technical field

The invention belongs to oil development reservoir engineering technical field, especially relate to poly-the driving of a kind of Conglomerate Reservoir and relatively permeate The determination method of rate curve.

Background technology

Conglomerate Reservoir have the deposition characteristics different from conventional sandstone reservoir, conventional physical property and the pore structure of complexity and Heterogeneous reservoirs in plane and on vertical profile, brings great difficulty to the exploitation of Conglomerate Reservoir.Conglomerate Reservoir permeates Rate is one of important content of oil reservoir development evaluation, the change of each phase fluid percolation ability in permeability saturation curve reflection oil reservoir Rule, is prediction oil field development production target and the important indicator of dynamic situation of change.

Conglomerate Reservoir is during poly-driving, and reservoir properties can change, and causes oil-water relative permeability curve to become Change.Conventional stationarity measures rock core permeability saturation curve method with cold store enclosure rock core test and mainly reflects that rock core oozes relation mutually, Whether can be suitably used for the Conglomerate Reservoir of strong anisotropism to still need discussion, permeability saturation curve data is reservoir engineering and oil simultaneously Hiding the important parameter in numerical simulation engineering calculation work, well test analysis is studied by the change of formation rock permeability saturation curve Affect the biggest.

The patent of Application No. 201210276977.7 discloses a kind of side determining complete oil-water relative permeability curve Method, the method, according to high waterflood flush multiple experimental data, determines the limit oil displacement efficiency under different reservoir permeability and aqueous phase Maximum relative permeability, sets up limit oil displacement efficiency, aqueous phase maximum relative permeability with the Changing Pattern of core permeability and oil Phase, aqueous phase relative permeability computing formula.

The patent of Application No. 201020557847.7 discloses a kind of use for laboratory phase permeability curve testing integrated Device, including container, constant-flux pump, intermediate receptacle, pressure transducer, is sandwiched between the core holding unit of rock core, and described device is also Including data processor, oil water separator and data acquisition unit；Container outlet equipped with water connects constant-flux pump, and constant-flux pump outlet is logical Crossing valve to be connected with intermediate receptacle, intermediate receptacle outlet is connected with rock core by valve, and rock core outlet is divided with profit by valve Connect from device；At core entry and core holding unit top is equipped with pressure transducer, and pressure transducer is with data processor even Connecing, data processor is connected with the data acquisition unit being located at oil water separator top.This patent can be monitored in experimentation in real time Pressure trend, fuel-displaced water outlet data and phase percolation curve tendency, decrease artificial process and error in reading.

Application No. 201110094678.7 discloses a kind of rheological property of polymer solution and combines with rock core relative permeability Test device and method.This device include noting poly-unit, oiling unit, line rheometer, core holding unit, oil-liquid separator, Differential pressure pickup, electronic weighing instrument, each several part is connected by pipeline and control valve.Its method is that rock core is placed in core holding unit In, utilize note poly-unit rock core injection of polymer solution example in core holding unit, gather pressure reduction and data on flows, calculate Polymer solution viscosity under different flow, with the relation of flow, the shear rate being combined in line rheometer show that polymer is molten The rheological curve of liquid；With oiling unit oiling, the polymer solution in rock core is driven away, in rock core, note polymerization with noting poly-unit Thing solution carries out the displacement of reservoir oil, and in displacement process, oil-liquid separator records the change of oil mass in real time, electronic weighing instrument record in real time oil and The change of the total liquid measure of polymer；Flow, oil production, Liquid output, pressure reduction and time data that finally utilization obtains carry out polymer The relative leakage of solution and oil calculates.

The Experimental Method in Laboratory of said determination relative permeability, the test consuming time is long, it is desirable to high, expensive, artificially misses Difference is big, it is difficult to ensure representativeness and accuracy, the limitation of rock core test simultaneously, it is also difficult to react gravel really of measurement result Behavioral characteristics during rock oil reservoir development.

Summary of the invention

For above-mentioned technical problem, in order to describe, Conglomerate Reservoir is poly-drives permeability saturation curve, utilizes the exploitation of Conglomerate Reservoir Data, the present invention provides a kind of Conglomerate Reservoir to gather the determination method driving permeability saturation curve, utilizes dynamic data accurately to calculate Conglomerate Reservoir is poly-drives permeability saturation curve, and with accurate characterization Conglomerate Reservoir behavioral characteristics, overcoming experimental determination rock core has The shortcoming that effect permeability is excessive with actual formation effective permeability deviation, has considered Conglomerate Reservoir strong anisotropism feature and has built Vertical effective permeability computation model, provides effective for oil field development prediction and supports have important practical significance.

The technical solution used in the present invention is:

A kind of Conglomerate Reservoir gathers the determination method driving permeability saturation curve, comprises the following steps:

(1) poly-displacement of reservoir oil well composite water cut f is calculated_w

$f_w=\frac{q_w{\mathrm{\ρ}}_w}{q_w{\mathrm{\ρ}}_w+q_o}$

In formula: f_wFor poly-displacement of reservoir oil well composite water cut, decimal；q_wFor moon aquifer yield, m³/d；ρ_wFor poly-expelling water phase density, g/ cm³；q_oFor monthly oil production, t/d；

(2) one-level linear fit relational expression y is set up₁=ax+b, by the f obtained in step (1)_w, it is thus achieved that fitting parameter a, b, Fitting precision R₁, wherein,

$y_1=ln(\frac{1}{f_w}-1)+ln\left(\frac{B_o{\mathrm{\μ}}_o{\mathrm{\ρ}}_w}{{\mathrm{\μ}}_w{\mathrm{\ρ}}_o}\right),x=\frac{N_P}{N}$

B in formula_oFor poly-displacement of reservoir oil phase volume coefficient, decimal；μ_oFor viscosity of crude, mPa s；μ_wFor poly-expelling water phase viscosity, mPa·s；ρ_oFor poly-expelling water phase density, g/cm³；N_PFor cumulative oil production, × 10⁴t；N is oil in place × 10⁴t；

(3) by fitting parameter a and b obtained in step (2), relative permeability is utilized to drive water saturation relational expression with poly-Calculate and different gathering drive water saturation S_wUnder poly-drive oil-water relative permeability ratio value

(4) two grades of linear fit relational expressions y are set up₂=k₁x₁+k₂x₂+k₃, and by step (3) obtainsObtain and intend Close parameter k₁、k₂And k₃, fitting precision R₂, wherein,

$y_2=\lg \left(\frac{K_{ro}}{K_{rw}}\right),x_1=\lg \left(\frac{1-S_{or}-S_w}{1-S_{or}-S_{wi}}\right),x_2=\lg \left(\frac{S_w-S_{wi}}{1-S_{or}-S_{wi}}\right);$

S in formula_orResidual oil saturation, decimal is driven for poly-；S_wiIrreducible water saturation, decimal is driven for poly-；

(5) by the fitting parameter k obtained in step (4)₁、k₂And k₃, calculate to gather and drive different water cut saturation S_wUnder profit Biphase relative permeability K_ro、K_rw；

$K_{ro}=K_{{\mathrm{ro}}_{swi}}{\left(\frac{1-S_{or}-S_w}{1-S_{or}-S_{wi}}\right)}^{k_1}$

$K_{rw}=K_{{\mathrm{rw}}_{sor}}{\left(\frac{S_w-S_{wi}}{1-S_{or}-S_{wi}}\right)}^{-k_2}$

Wherein:

K_roOil relative permeability, decimal is driven for poly-；The oil relative permeability under irreducible water saturation is driven for poly-, Decimal；K_rwFor poly-expelling water phase relative permeability, decimal；The aqueous phase relative permeability under residual oil saturation is driven for poly-, little Number；S_wStratum water saturation, decimal is driven for poly-；

(6) oil relative permeability K is driven according to the poly-of calculating acquisition in step (5)_ro, poly-expelling water phase relative permeability K_rw Data, draw to gather and drive water-oil phase permeability saturation curve.

Conglomerate Reservoir of the present invention gathers the determination method driving permeability saturation curve, wherein, in step (3)

The method have the benefit that

Conglomerate Reservoir of the present invention gathers the determination method driving permeability saturation curve, and Method And Principle is clear, quantification, Workable, it is simple to using, the construction operation for reservoir numerical simulation, subsequent development program prediction and scene provides more Add reliable reference frame.The present invention can quickly obtain the poly-permeability saturation curve that drives of more accurate Conglomerate Reservoir, low cost, Efficiency is high, greatly reduces workload.For there to be the block of rock core displacement test data, laboratory core can be revised by contrast and drive For result of the test, effectively reduce experimental error and save experimental period.Meanwhile, reservoir engineering method and oil reservoir are the method achieved The combination of Physical Experiment, has stronger reference function to solving other Similar Problems.

Accompanying drawing explanation

Fig. 1 is that poly-in the present invention drives water-oil phase permeability saturation curve figure.

Below in conjunction with specific embodiments and the drawings, the invention will be further described.

Detailed description of the invention

A kind of Conglomerate Reservoir of the present embodiment gathers the determination method driving permeability saturation curve, with Karamay, Xinjiang A1 well gravel Rock oil reservoir is poly-drive as a example by, comprise the following steps:

(1) poly-displacement of reservoir oil well composite water cut f is calculated_w

$f_w=\frac{q_w{\mathrm{\ρ}}_w}{q_w{\mathrm{\ρ}}_w+q_o}$

In formula: f_wFor poly-displacement of reservoir oil well composite water cut, decimal；q_wFor moon aquifer yield, m³/d；ρ_wFor poly-expelling water phase density, g/ cm³；q_oFor monthly oil production, t/d；

(2) one-level linear fit relational expression y is set up₁=ax+b, by the f obtained in step (2)_w, it is thus achieved that fitting parameter a, b, Fitting precision R₁, wherein,

$y_1=ln(\frac{1}{f_w}-1)+ln\left(\frac{B_o{\mathrm{\μ}}_o{\mathrm{\ρ}}_w}{{\mathrm{\μ}}_w{\mathrm{\ρ}}_o}\right),x=\frac{N_P}{N}$

B in formula_oFor poly-displacement of reservoir oil phase volume coefficient, decimal；μ_oFor viscosity of crude, mPa s；μ_wFor poly-expelling water phase viscosity, mPa·s；ρ_oFor poly-expelling water phase density, g/cm³；N_PFor cumulative oil production, × 10⁴t；N is oil in place × 10⁴T, polymer flooding parameters Basic data drives creation data the most as shown in Table 1 and Table 2 with poly-；

(3) by fitting parameter a and b obtained in step (2), relative permeability is utilized to drive water saturation relational expression with poly-Calculate and different gathering drive water saturation S_wUnder poly-drive oil-water relative permeability ratio valueWhereinResult of calculation is as shown in table 3；

(4) two grades of linear fit relational expressions y are set up₂=k₁x₁+k₂x₂+k₃, and by step (3) obtainsObtain and intend Close parameter k₁、k₂And k₃, fitting precision R₂, wherein,

$y_2=\lg \left(\frac{K_{ro}}{K_{rw}}\right),x_1=\lg \left(\frac{1-S_{or}-S_w}{1-S_{or}-S_{wi}}\right),x_2=\lg \left(\frac{S_w-S_{wi}}{1-S_{or}-S_{wi}}\right);$

S in formula_orResidual oil saturation, decimal is driven for poly-；S_wiIrreducible water saturation, decimal is driven for poly-；

(5) by the fitting parameter k obtained in step (4)₁、k₂And k₃, calculate to gather and drive different water cut saturation S_wUnder profit Biphase relative permeability K_ro、K_rw；

$K_{ro}=K_{{\mathrm{ro}}_{swi}}{\left(\frac{1-S_{or}-S_w}{1-S_{or}-S_{wi}}\right)}^{k_1}$

$K_{rw}=K_{{\mathrm{rw}}_{sor}}{\left(\frac{S_w-S_{wi}}{1-S_{or}-S_{wi}}\right)}^{-k_2}$

Wherein:

K_roOil relative permeability, decimal is driven for poly-；The oil relative permeability under irreducible water saturation is driven for poly-, Decimal；K_rwFor poly-expelling water phase relative permeability, decimal；The aqueous phase relative permeability under residual oil saturation is driven for poly-, little Number；S_wStratum water saturation, decimal is driven for poly-；

(6) according to calculating in step (5), the calculating acquisition obtained is poly-drives oil relative permeability K_ro, poly-expelling water oozes the most relatively Rate K thoroughly_rwData, result of calculation is as shown in table 3, draws to gather and drives water-oil phase permeability saturation curve, the poly-displacement of reservoir oil water two of drafting Phase permeability saturation curve is as shown in Figure 1.

Table 1 inputs polymer flooding parameters base data table

N(×104t)	ρo(g/cm3)	μo(mPa·s)	Bo	Swi	Kro(Swi)
						200	0.833	2.41	1.16	0.29	1
	ρw(g/cm3)	μw(mPa·s)	Bw	Sor	Krp(Sor)
							1.311	3.21	1.02	0.27	0.892

Table 2 is poly-drives creation data table

Table 3 oil, aqueous phase relative permeability K_ro、K_rwResult of calculation

Sw	kro/krw	Kro	Krw
				0.29		1	0
0.30	13809.1542	0.9176	0
				0.33	4048.5594	0.709	0
0.36	1186.9542	0.5375	0.0003
				0.39	347.9905	0.3985	0.0013
0.41	102.0236	0.2878	0.004
				0.44	29.9112	0.2016	0.0096
0.47	8.7694	0.1359	0.0201
				0.50	2.571	0.0875	0.0376
0.53	0.7538	0.0531	0.0651
				0.56	0.221	0.0299	0.1059
0.59	0.0648	0.0151	0.1639
				0.62	0.019	0.0066	0.2436
0.64	0.0056	0.0022	0.3502
				0.67	0.0016	0.0005	0.4894
0.70	0.0005	0	0.6675
				0.73	0.0001	0	0.8917

Embodiment described above is only to be described the preferred embodiment of the present invention, the not model to the present invention Enclose and be defined, on the premise of designing spirit without departing from the present invention, the those of ordinary skill in the art technical side to the present invention Various deformation that case is made and improvement, all should fall in the protection domain that claims of the present invention determines.

Claims (2)

1. a Conglomerate Reservoir gathers the determination method driving permeability saturation curve, it is characterised in that: comprise the following steps:

(1) poly-displacement of reservoir oil well composite water cut f is calculated_w

$f_w=\frac{q_w{\mathrm{\ρ}}_w}{q_w{\mathrm{\ρ}}_w+q_o}$

In formula: f_wFor poly-displacement of reservoir oil well composite water cut, decimal；q_wFor moon aquifer yield, m³/d；ρ_wFor poly-expelling water phase density, g/cm³； q_oFor monthly oil production, t/d；

(2) one-level linear fit relational expression y is set up₁=ax+b, by the f obtained in step (1)_w, it is thus achieved that fitting parameter a, b, its In,

$y_1=ln(\frac{1}{f_w}-1)+ln\left(\frac{B_o{\mathrm{\μ}}_o{\mathrm{\ρ}}_w}{{\mathrm{\μ}}_w{\mathrm{\ρ}}_o}\right),x=\frac{N_P}{N}$

B in formula_oFor poly-displacement of reservoir oil phase volume coefficient, decimal；μ_oFor viscosity of crude, mPa s；μ_wFor poly-expelling water phase viscosity, mPa s； ρ_oFor poly-expelling water phase density, g/cm³；N_PFor cumulative oil production, × 10⁴t；N is oil in place × 10⁴t；

(3) by fitting parameter a and b obtained in step (2), relative permeability is utilized to drive water saturation relational expression with poly-Calculate and different gathering drive water saturation S_wUnder poly-drive oil-water relative permeability ratio value

(4) two grades of linear fit relational expressions y are set up₂=k₁x₁+k₂x₂+k₃, and by step (3) obtainsAcquisition matching is joined Number k₁、k₂And k₃, wherein,

$y_2=\lg \left(\frac{K_{ro}}{K_{rw}}\right),x_1=\lg \left(\frac{1-S_{or}-S_w}{1-S_{or}-S_{wi}}\right),x_2=\lg \left(\frac{S_w-S_{wi}}{1-S_{or}-S_{wi}}\right);$

S in formula_orResidual oil saturation, decimal is driven for poly-；S_wiIrreducible water saturation, decimal is driven for poly-；

(5) by the fitting parameter k obtained in step (4)₁、k₂And k₃, calculate to gather and drive different water cut saturation S_wUnder water-oil phase Relative permeability K_ro、K_rw；

$K_{ro}=K_{{\mathrm{ro}}_{swi}}{\left(\frac{1-S_{or}-S_w}{1-S_{or}-S_{wi}}\right)}^{k_1}$

$K_{rw}=K_{{\mathrm{rw}}_{sor}}{\left(\frac{S_w-S_{wi}}{1-S_{or}-S_{wi}}\right)}^{-k_2}$

Wherein:

K_roOil relative permeability, decimal is driven for poly-；The oil relative permeability under irreducible water saturation is driven for poly-, little Number；K_rwFor poly-expelling water phase relative permeability, decimal；The aqueous phase relative permeability under residual oil saturation, decimal is driven for poly-； S_wStratum water saturation, decimal is driven for poly-；

(6) oil relative permeability K is driven according to the poly-of calculating acquisition in step (5)_ro, poly-expelling water phase relative permeability K_rwData, Draw to gather and drive water-oil phase permeability saturation curve.

Conglomerate Reservoir the most according to claim 1 gathers the determination method driving permeability saturation curve, it is characterised in that: step (3) in