CN104405364B - A kind of evaluation method and device for oil well production characteristics - Google Patents

A kind of evaluation method and device for oil well production characteristics Download PDF

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Publication number
CN104405364B
CN104405364B CN201410571889.9A CN201410571889A CN104405364B CN 104405364 B CN104405364 B CN 104405364B CN 201410571889 A CN201410571889 A CN 201410571889A CN 104405364 B CN104405364 B CN 104405364B
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continuous mapping
pressure
pump
oil well
pip
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CN104405364A (en
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赵瑞东
师俊峰
陶珍
张建军
熊春明
马文明
苏磊
张鑫
孙慧峰
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China Petroleum and Natural Gas Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00Survey of boreholes or wells

Abstract

The present invention provides a kind of evaluation method and device for oil well production characteristics, is applied to oil-gas mining technical field, and the method includes:Determine one group of lower-continuous mapping sequence;Under conditions of oil well output is specified, the inflow performance relationship curve according to oil well determines flowing bottomhole pressure (FBHP);Proceeded as follows for each lower-continuous mapping in the lower-continuous mapping sequence:Calculate the corresponding PIP of the lower-continuous mapping;Calculate the corresponding pump discharge pressure of the lower-continuous mapping;Calculate the corresponding required pump pressure of the lower-continuous mapping poor;The functional relation set up respectively between lower-continuous mapping and PIP, pump discharge pressure, required pump pressure difference;Using the functional relation between the lower-continuous mapping and PIP, pump discharge pressure, required pump pressure difference, the industry characteristics to oil well are evaluated.The present invention has considered the working characteristics of oil reservoir, fluid and pit shaft, helps to evaluate industry characteristics from oil well total system.

Description

A kind of evaluation method and device for oil well production characteristics
Technical field
The present invention relates to oil-gas mining technical field, in particular it relates to a kind of evaluation method and device for oil well production characteristics.
Background technology
Flowing of the oil gas from oil reservoir access wall bottom and in the wellbore is two basic flow process of oil-gas mining, although it Have different flowing laws in itself, but be in process of production two processes being mutually linked, oil gas is respectively in oil Kinetic characteristic in Tibetan and pit shaft has in-depth study both at home and abroad, can be flowed into oil well from the flow process at oil reservoir access wall bottom Dynamic is described, and the flow process in oil gas pit shaft can describe with multiphase pipe flow rule.
When oil reservoir energy is sufficient, it is possible to use oil gas is passed through oil reservoir and wellbore lift to ground by oil reservoir energy in itself Face, now oil well being capable of blowing;When oil reservoir energy is relatively low, it is necessary to which lifting equipment increases energy and oil gas is given rise to from shaft bottom Come on ground.
Artificially lifted well is made up of two parts:Oil reservoir-pit shaft part and lifting equipment part, it is well known that electric submersible pump, spiral shell The lifting equipments such as bar pump, jet pump have corresponding equipment characteristic working curve, and (such as yield-differential pressure curve, yield-power are bent Line), this kind of characteristic working curve can reflect the ability to work of lifting equipment part;But record to come with regard to current domestic and foreign literature See there is no also concentrated expression oil reservoir-pit shaft and the overall characteristic working curve of lifting equipment to study.
Comprehensive study reflects that oil reservoir-pit shaft and the overall characteristic working curve of lifting equipment have very for oil-gas mining After important meaning, such as completion oil well can blowing, blowing ability how many, be such as unable to blowing, different output needs lifting Equipment provides how many energy, and these characteristics may be by concentrated expression oil reservoir-pit shaft and the overall working characteristics of lifting equipment Curve is analyzed.
The content of the invention
The main purpose of the embodiment of the present invention is to provide a kind of evaluation method and device for oil well production characteristics, existing to overcome Have and be only limitted to lifting equipment part for the characteristic research of Production Wells, without being ground for whole well system The defect studied carefully.
To achieve these goals, the embodiment of the present invention provides a kind of oil well production evaluating characteristics, including:
Determine one group of lower-continuous mapping sequence, each lower-continuous mapping is quiet more than or equal to oil well in the lower-continuous mapping sequence Level and deep less than or equal in oil reservoir;
Under conditions of oil well output is specified, the inflow performance relationship curve according to oil well determines flowing bottomhole pressure (FBHP);
Proceeded as follows for each lower-continuous mapping in the lower-continuous mapping sequence:According to the lower-continuous mapping, oil reservoir Middle deep and described flowing bottomhole pressure (FBHP), PIP is calculated using multiphase pipe flow formula;According to the lower-continuous mapping and the well of oil well Mouth pressure, pump discharge pressure is calculated using multiphase pipe flow formula;Calculate the PIP and pump discharge pressure it Difference, obtains the corresponding required pump pressure of the lower-continuous mapping poor;
According to each lower-continuous mapping in the lower-continuous mapping sequence and its corresponding PIP, pump discharge pressure Power, required pump pressure are poor, the letter set up respectively between lower-continuous mapping and PIP, pump discharge pressure, required pump pressure difference Number relation;
Using the functional relation between the lower-continuous mapping and PIP, pump discharge pressure, required pump pressure difference, Industry characteristics to oil well are evaluated.
Accordingly, the present invention also provides a kind of oil well production apparatus for evaluating characteristics, including:
Sequence determining module, for determining one group of lower-continuous mapping sequence, each lower pump depth in the lower-continuous mapping sequence Degree is more than or equal to the hydrostatic level depth of oil well and less than or equal to depth in oil reservoir;
Flowing bottomhole pressure (FBHP) determining module, under conditions of oil well output is specified, the inflow performance relationship curve according to oil well to be true Stable bottom hole pressure;
Computing module, for being proceeded as follows for each lower-continuous mapping in the lower-continuous mapping sequence:According to this The deep and flowing bottomhole pressure (FBHP) in lower-continuous mapping, oil reservoir, PIP is calculated using multiphase pipe flow formula;According to the lower pump depth The well head pressure of degree and oil well, pump discharge pressure is calculated using multiphase pipe flow formula;Calculate the PIP and pump The difference of outlet pressure, obtains the corresponding required pump pressure of the lower-continuous mapping poor;
Functional relation sets up module, for according to each lower-continuous mapping and its corresponding pump in the lower-continuous mapping sequence Suction pressure, pump discharge pressure, required pump pressure are poor, and lower-continuous mapping and PIP, pump discharge pressure are set up respectively Functional relation between power, required pump pressure difference;
Evaluation module, for using the lower-continuous mapping and PIP, pump discharge pressure, required pump pressure difference Between functional relation, the industry characteristics to oil well evaluate.
By means of above-mentioned technical proposal, the present invention is based on characterizing inflow performance relationship curve of the oil gas from oil reservoir access wall bottom, with And the multiphase pipe flow rule of oil gas flow behavior in the wellbore is characterized, establish lower-continuous mapping and discharged with PIP, pump Functional relation between mouth pressure, required pump pressure difference, according to above-mentioned functional relation, it is convenient to which the industry characteristics to oil well are carried out Evaluate, compared to prior art, the present invention has considered the working characteristics of oil reservoir, fluid and pit shaft, contributed to whole from oil well Industry characteristics are evaluated on system system.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, embodiment will be described below Needed for the accompanying drawing to be used be briefly described, it should be apparent that, drawings in the following description are only more of the invention Embodiment, for those of ordinary skill in the art, on the premise of not paying creative work, can also be attached according to these Figure obtains other accompanying drawings.
Fig. 1 is the schematic flow sheet of the oil well production evaluating characteristics that the present invention is provided;
Fig. 2 is between the lower-continuous mapping that the present invention is provided and PIP, pump discharge pressure, required pump pressure difference Curved line relation;
Fig. 3 is the curved line relation between lower-continuous mapping provided in an embodiment of the present invention and required pump pressure difference;
When Fig. 4 is two kinds of different inner diameters oil pipes of use provided in an embodiment of the present invention between lower-continuous mapping and required pump pressure difference Curved line relation;
Fig. 5 is the structured flowchart of the oil well production apparatus for evaluating characteristics that the present invention is provided.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made Embodiment, belongs to the scope of protection of the invention.
The present invention provides a kind of oil well production evaluating characteristics, as shown in figure 1, including:
Step S11, determines one group of lower-continuous mapping sequence, and each lower-continuous mapping is more than or equal in the lower-continuous mapping sequence The hydrostatic level depth of oil well and deep less than or equal in oil reservoir.
Specifically, be directed to a certain oil well, with its hydrostatic level depth and oil reservoir depth as span, using a fixed step size as A series of interval, it may be determined that go out lower-continuous mappings.During specific implementation, the interval in lower-continuous mapping sequence between each lower-continuous mapping is got over Small, then result of calculation gets over the industry characteristics of energy actual response oil well, but amount of calculation also can be bigger, therefore it is determined that lower-continuous mapping , it is necessary to choosing comprehensively result of calculation accuracy and amount of calculation size during interval between each lower-continuous mapping in sequence.
In order to following description is convenient, lower-continuous mapping sequence is with (H in herein below1, H2, H3..., HN) represent, wherein, HNTable Show lower-continuous mapping, N is natural number, and N >=1.
Step S12, under conditions of oil well output is specified, according to the inflow performance relationship curve of oil well, determines flowing bottomhole pressure (FBHP).
Specifically, inflow performance relationship curve have recorded the relation between oil well output and flowing bottomhole pressure (FBHP), therefore in specified oil well Under conditions of yield, corresponding flowing bottomhole pressure (FBHP) can determine that according to inflow performance relationship curve.Flowing bottomhole pressure (FBHP) is with P in herein belowwfTable Show.
Step S13, following steps S131~step is carried out for each lower-continuous mapping in the lower-continuous mapping sequence S133:
Step S131, according to deep in the lower-continuous mapping, oil reservoir and described flowing bottomhole pressure (FBHP), pump is calculated using multiphase pipe flow formula Suction pressure.
Specifically, setting pump depth HNCorresponding PIP is PinN, then lower-continuous mapping sequence (H1, H2, H3..., HN) corresponding PIP sequence be (Pin1, Pin2, Pin3..., PinN)。
In the step, lower-continuous mapping H is calculated using multiphase pipe flow formulaNCorresponding PIP PinN, specific formula It is as follows:
(formula 1)
In formula 1, g is acceleration of gravity, unit m2/s;ρmIt is well liquid density, unit K g/m3;θ is hole angle, unit rad;fmIt is coefficient of friction;vmIt is well liquid flow velocity, unit m/s;D is pipe aperture, unit m;Z is well bore depth measurement, unit m;Hperf It is deep in oil reservoir, unit m.
Step S132, according to the lower-continuous mapping and the well head pressure of oil well, pump discharge is calculated using multiphase pipe flow formula Pressure.
In the step, the well head pressure of oil well can determine in advance, if the well head pressure of oil well is Pt, lower-continuous mapping HNIt is right The pump discharge pressure answered is PoutN, then lower-continuous mapping sequence (H1, H2, H3..., HN) corresponding pump discharge pressure sequence be (Pout1, Pout2, Pout3..., PoutN)。
In the step, lower-continuous mapping H is calculated using multiphase pipe flow formulaNCorresponding pump discharge pressure PoutN, specific formula is such as Under:
(formula 2)
Each meaning of parameters is referring to each meaning of parameters in aforementioned formula 1 in formula 2.
Step S133, calculates the difference of the PIP and pump discharge pressure, obtains the lower-continuous mapping corresponding Required pump pressure is poor.
Set pump depth HNPump pressure difference is △ P needed for correspondingN, then lower-continuous mapping sequence (H1, H2, H3..., HN) corresponding Required pump pressure difference sequence is (△ P1, △ P2, △ P3..., △ PN), and △ PN=PinN-PoutN
Step S14, according to each lower-continuous mapping and its corresponding PIP, pump in the lower-continuous mapping sequence Outlet pressure, required pump pressure are poor, lower-continuous mapping are set up respectively poor with PIP, pump discharge pressure, required pump pressure Between functional relation.
Specifically, the step is according to the lower-continuous mapping sequence (H determined in step S131, H2, H3..., HN) and Pump Suction Nozzle Pressure sequence (Pin1, Pin2, Pin3..., PinN) between corresponding relation, the letter set up between lower-continuous mapping and PIP Number relation, according to the lower-continuous mapping sequence (H determined in step S131, H2, H3..., HN) and pump discharge pressure sequence (Pout1, Pout2, Pout3..., PoutN) between corresponding relation, the functional relation set up between lower-continuous mapping and pump discharge pressure, according to step Lower-continuous mapping sequence (the H determined in rapid S131, H2, H3..., HN) it is pumped difference sequence (△ P with required1, △ P2, △ P3..., △ PN) Between corresponding relation, set up lower-continuous mapping and required pump pressure difference between functional relation.
Three kinds of functional relations of above-mentioned foundation can represent in a variety of forms, such as formula form, curve form etc..In order to more Above-mentioned functional relation is intuitively represented, in a kind of preferred embodiment, these three functional relations are represented with curve form. For example in two-dimensional coordinate system, with lower-continuous mapping as abscissa, with required pump pressure difference as ordinate, lower-continuous mapping and institute are can obtain The corresponding curved line relation of difference need to be pumped, it is similar, with lower-continuous mapping as abscissa, with PIP as ordinate, can obtain It is vertical with pump discharge pressure with lower-continuous mapping as abscissa to lower-continuous mapping curved line relation corresponding with PIP Coordinate, can obtain lower-continuous mapping curved line relation corresponding with pump discharge pressure.
Preferably, as shown in Fig. 2 the present invention can also be with lower-continuous mapping as abscissa, pressure is ordinate, while obtaining Curved line relation between lower-continuous mapping and PIP, pump discharge pressure, required pump pressure difference.
Step S15, using between the lower-continuous mapping and PIP, pump discharge pressure, required pump pressure difference Functional relation, the industry characteristics to oil well are evaluated.
Specifically, because above-mentioned three kinds of functional relations are bent based on thermally coupled flow of the oil gas from oil reservoir access wall bottom is characterized Line, and characterize what the multiphase pipe flow rule that flows in the wellbore of oil gas was set up, therefore above-mentioned three kinds of functional relations are from system The upper concentrated expression industry characteristics of oil well, and then using above-mentioned three kinds of functional relations oil well production characteristic can be entered on the whole Row is evaluated.
Specifically, using the letter between the lower-continuous mapping and PIP, pump discharge pressure, required pump pressure difference Number relation, the industry characteristics to oil well are evaluated, can included:Lower-continuous mapping, optimizing pipe string needed for determining oil well blowing Internal diameter, can make full use of the energy of oil well itself, and reducing energy consumption improves system effectiveness of lifting well etc..
Lower-continuous mapping and required pump pressure difference function relation are calculated by taking certain oil well as an example below, and utilizes this functional relation pair The industry characteristics of the oil well are evaluated.Calculating parameter is as follows:Pit shaft is vertical, strata pressure 24MPa, well depth 2500m, in oil pipe Footpath 0.062m, oil pipe external diameter 0.073m, tubing anchor, moisture content is 0, relative oil density 0.8, natural gas relative density 0.75 Deng.
The oil well is illustrated in figure 3 in the case where production conditions are specified, the curve between its lower-continuous mapping and required pump pressure difference is closed System, by the figure, when lower-continuous mapping is more than 1500m, required pump pressure difference from the occasion of negative value is changed into, i.e., when lower-continuous mapping is big In 1500m, the oil well can carry out blowing by specified yield.Therefore, the lower-continuous mapping and required pump being calculated using the present invention Pressure difference functional relation, it is possible to achieve quickly determine suitable lower-continuous mapping to realize the blowing of oil well.
The oil well is illustrated in figure 4 in the case where production conditions are specified, using two kinds of different inner diameters (respectively 74mm and 62mm) Oil pipe when, its lower-continuous mapping and required pump pressure difference between curved line relation, by the figure, when lower-continuous mapping is less than During 1150m, pump pressure difference is smaller needed for the oil pipe of 74mm internal diameters is corresponding, and when lower-continuous mapping is more than 1150m, 62mm internal diameters Pump pressure difference is smaller needed for oil pipe is corresponding.In line with the selection principle of low energy consumption, when lower-continuous mapping is less than 1150m, preferably 74mm The oil pipe of internal diameter, when lower-continuous mapping is more than 1150m, the preferred oil pipe of 62mm internal diameters.Therefore, it is calculated using the present invention Lower-continuous mapping and required pump pressure difference function relation, can be needed for by contrasting the oil pipe of different inner diameters in same lower-continuous mapping The poor oil pipe quickly to select optimal internal diameter of pump pressure.
Accordingly, the present invention also provides a kind of oil well production apparatus for evaluating characteristics, as shown in figure 5, the device includes:
Sequence determining module 51, for determining one group of lower-continuous mapping sequence, each lower pump in the lower-continuous mapping sequence Depth is more than or equal to the hydrostatic level depth of oil well and less than or equal to depth in oil reservoir;
Flowing bottomhole pressure (FBHP) determining module 52, under conditions of oil well output is specified, according to the inflow performance relationship curve of oil well Determine flowing bottomhole pressure (FBHP);
Computing module 53, for being proceeded as follows for each lower-continuous mapping in the lower-continuous mapping sequence:According to The deep and flowing bottomhole pressure (FBHP) in the lower-continuous mapping, oil reservoir, PIP is calculated using multiphase pipe flow formula;According to the lower pump The well head pressure of depth and oil well, pump discharge pressure is calculated using multiphase pipe flow formula;Calculate the PIP and The difference of pump discharge pressure, obtains the corresponding required pump pressure of the lower-continuous mapping poor;
Functional relation sets up module 54, for according to each lower-continuous mapping in the lower-continuous mapping sequence and its corresponding PIP, pump discharge pressure, required pump pressure are poor, and lower-continuous mapping and PIP, pump discharge are set up respectively Functional relation between pressure, required pump pressure difference;
Evaluation module 55, for poor with PIP, pump discharge pressure, required pump pressure using the lower-continuous mapping Between functional relation, the industry characteristics to oil well evaluate.
Oil well production apparatus for evaluating characteristics shown in Fig. 5 is based on identical with the oil well production evaluating characteristics shown in Fig. 1 Invention thought realize that its specific embodiment can refer to the foregoing introduction to oil well production evaluating characteristics, herein no longer Repeat.
The present invention is flowed in the wellbore based on sign inflow performance relationship curve of the oil gas from oil reservoir access wall bottom, and sign oil gas The multiphase pipe flow rule of dynamic characteristic, establishes between lower-continuous mapping and PIP, pump discharge pressure, required pump pressure difference Functional relation, according to above-mentioned functional relation, it is convenient to which the industry characteristics to oil well are evaluated, compared to prior art, The present invention has considered the working characteristics of oil reservoir, fluid and pit shaft, helps to enter industry characteristics from oil well total system Row is evaluated.
Particular embodiments described above, has been carried out further in detail to the purpose of the present invention, technical scheme and beneficial effect Describe in detail bright, should be understood that and the foregoing is only specific embodiment of the invention, the guarantor being not intended to limit the present invention Shield scope, all any modification, equivalent substitution and improvements within the spirit and principles in the present invention, done etc., should be included in this Within the protection domain of invention.

Claims (4)

1. a kind of oil well production evaluating characteristics, it is characterised in that including:
Determine one group of lower-continuous mapping sequence, hydrostatic level of each lower-continuous mapping more than or equal to oil well in the lower-continuous mapping sequence Depth and deep less than or equal in oil reservoir;
Under conditions of oil well output is specified, the inflow performance relationship curve according to oil well determines flowing bottomhole pressure (FBHP);
Proceeded as follows for each lower-continuous mapping in the lower-continuous mapping sequence:According to deep in the lower-continuous mapping, oil reservoir And the flowing bottomhole pressure (FBHP), calculate PIP using multiphase pipe flow formula;According to the lower-continuous mapping and the well head pressure of oil well Power, pump discharge pressure is calculated using multiphase pipe flow formula;The difference of the PIP and pump discharge pressure is calculated, is obtained It is poor to the corresponding required pump pressure of the lower-continuous mapping;
According to each lower-continuous mapping in the lower-continuous mapping sequence and its corresponding PIP, pump discharge pressure, Required pump pressure is poor, and the function set up respectively between lower-continuous mapping and PIP, pump discharge pressure, required pump pressure difference is closed System;
Using the functional relation between the lower-continuous mapping and PIP, pump discharge pressure, required pump pressure difference, to oil The industry characteristics of well are evaluated;
Function between the described utilization lower-continuous mapping and PIP, pump discharge pressure, required pump pressure difference is closed System, the industry characteristics to oil well are evaluated, specifically included:Lower-continuous mapping, optimizing pipe string internal diameter needed for determining oil well blowing.
2. method according to claim 1, it is characterised in that the lower-continuous mapping and PIP, pump discharge Functional relation between pressure, required pump pressure difference is represented with curve form.
3. a kind of oil well production apparatus for evaluating characteristics, it is characterised in that including:
Sequence determining module, for determining one group of lower-continuous mapping sequence, each lower-continuous mapping is big in the lower-continuous mapping sequence It is deep in the hydrostatic level depth equal to oil well and less than or equal to oil reservoir;
Flowing bottomhole pressure (FBHP) determining module, under conditions of oil well output is specified, the inflow performance relationship curve according to oil well to determine well Underflow pressure;
Computing module, for being proceeded as follows for each lower-continuous mapping in the lower-continuous mapping sequence:According to the lower pump The deep and flowing bottomhole pressure (FBHP) in depth, oil reservoir, PIP is calculated using multiphase pipe flow formula;According to the lower-continuous mapping and The well head pressure of oil well, pump discharge pressure is calculated using multiphase pipe flow formula;Calculate the PIP and pump discharge The difference of mouth pressure, obtains the corresponding required pump pressure of the lower-continuous mapping poor;
Functional relation sets up module, for being entered according to each lower-continuous mapping and its corresponding pumping in the lower-continuous mapping sequence Mouth pressure, pump discharge pressure, required pump pressure are poor, and lower-continuous mapping and PIP, pump discharge pressure, institute are set up respectively The functional relation between difference need to be pumped;
Evaluation module, for using between the lower-continuous mapping and PIP, pump discharge pressure, required pump pressure difference Functional relation, the industry characteristics to oil well are evaluated;
The evaluation module specifically for:Lower-continuous mapping, optimizing pipe string internal diameter needed for determining oil well blowing.
4. device according to claim 3, it is characterised in that the lower-continuous mapping and PIP, pump discharge Functional relation between pressure, required pump pressure difference is represented with curve form.
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