CN108278104A - A kind of low permeability oil field oil well interval pumping method - Google Patents
A kind of low permeability oil field oil well interval pumping method Download PDFInfo
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- CN108278104A CN108278104A CN201810076882.8A CN201810076882A CN108278104A CN 108278104 A CN108278104 A CN 108278104A CN 201810076882 A CN201810076882 A CN 201810076882A CN 108278104 A CN108278104 A CN 108278104A
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- 239000003129 oil well Substances 0.000 title claims abstract description 103
- 238000005086 pumping Methods 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000035699 permeability Effects 0.000 title claims abstract description 16
- 238000011084 recovery Methods 0.000 claims abstract description 19
- 230000007423 decrease Effects 0.000 claims description 17
- 239000012530 fluid Substances 0.000 claims description 13
- 230000005611 electricity Effects 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 4
- 230000001133 acceleration Effects 0.000 claims description 3
- 238000007405 data analysis Methods 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 239000006260 foam Substances 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 17
- 238000010586 diagram Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 241000406668 Loxodonta cyclotis Species 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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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
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
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Abstract
The present invention relates to petrochemical industries, and in particular to a kind of low permeability oil field oil well interval pumping method.A kind of low permeability oil field oil well interval pumping method, includes the following steps：Obtain strata pressurep eAnd Inflow Performance Relationship In OilwellsQ S(p)；Obtain oil well pump efficiency curveη(t)；With shut-in pressure recovery curveP r(t) on any point（t,p）Pumping pressure is opened as oil well, calculates the oil well output taken out between one in the periodQWith regarding the daily output；It calculates different open and regards the daily output under pumping pressure, to be to stop taking out pressure depending on working system when daily output maximumpOptimal when 0 pumping system, stopping the well time is（t‑T1）, well opening time is（T2‑t）；Select it is different stop taking out pressure, calculate a series of maximums for stopping taking out under pressure and regard the daily output, corresponding working system is optimal pumping system of oil well depending on the maximum value of the daily output.The present invention eliminates hydrodynamic face, and there are errors caused by conversion bottom pressure in hydrodynamic face caused by foam section.
Description
Technical field
The present invention relates to petrochemical industries, and in particular to a kind of low permeability oil field oil well interval pumping method.
Background technology
With deepening continuously for In Oil Field Exploration And Development, stratum energy, which declines, and permeability is low etc. can cause oil well to supply
Liquid scarce capacity, yield decline.Since oil well supply and discharge is uncoordinated, pumping unit is caused to be run under inefficient state for a long time.This is not only
It causes energy waste that can also aggravate equipment attrition, causes cost of crude oil production high.For this kind of oil well, domestic common side
Method is produced in a manner of pumping.Whether oil well interval pumping system is the key that rationally oil well interval pumping.
Current each elephant substantially formulates oil well interval pumping system according to artificial experience or well fluid level data.Due to
There are foam sections and acoustic speed to be not allowed for oil jacket annular space fluid column, and the well fluid level data measured all have certain error, and
Formation parameter is not complete enough, not enough standard or the computation model selected is not suitable for purpose oil reservoir, can cause to take out between finally obtaining
System is also not reasonable, and a pumping well productive potentialities are not excavated fully.
Invention content
The present invention provides a kind of low permeability oil field oil well interval pumping system formulation method, dynamic to overcome hydrodynamic face data method to exist
Fluid level data cannot reflect the problems such as stratum truth, propose using the bottom pressure data surveyed as calculation basis, with yield
Maximum turns to the method that principle determines oil well interval pumping system.
Technical program of the present invention lies in：
A kind of low permeability oil field oil well interval pumping method, includes the following steps：
Step 1：It is fitted shut-in pressure recovery curveP r(t), and according to shut-in pressure recovery curveP r(t) obtain strata pressurep e
And Inflow Performance Relationship In OilwellsQ S(p)；With oil well not between take out when oil well flowing bottomhole pressure (FBHP)p0 be between when taking out stop take out pressure, and look for
Go outp0 in shut-in pressure recovery curveP r(t) on corresponding time pointT1；
Step 2：It is fitted the pressure decline curves that drive a wellP r ′(t), it finds outp0 with the pressure decline curves that drive a wellP r ′(t) on it is corresponding
Time pointT2；According to the pressure decline curves that drive a wellP r ′(t) obtain oil well pump efficiency curveη(t)；
Step 3：With shut-in pressure recovery curveP r(t) on any point（t,p）Pumping pressure is opened as oil well, is taken out between calculating one
Oil well output in periodQWith regarding the daily output；
；
Step 4：It calculates different open and regards the daily output under pumping pressure, to be to stop taking out pressure depending on working system when daily output maximumpOptimal when 0 pumping system, stopping the well time is（t-T1）, well opening time is（T2-t）；
Step 5：Select it is different stop taking out pressure, calculate a series of maximums for stopping taking out under pressure and regard the daily output, most depending on the daily output
It is worth the optimal pumping system that corresponding working system is oil well greatly.
It further include step 6：When adjusting oil well interval pumping system in conjunction with electricity price information, and determining specific closing well moment and booting
It carves, realizes economic optimum.
The strata pressurep eIt is obtained by Well Test Data Analysis Method.
Inflow Performance Relationship In Oilwells in the step 1Q S(p) method be：
（1）In shut-in pressure recovery curve Pr(t) at arbitrary pressure spot, according in any two points when interval of delta t and pressure become
Change Δ P and calculates oil well output：
；
In formula：ΔhFor dynamic liquid level height variable quantity, unit m；ΔpFor bottom pressure variable quantity, units MPa；ΔtBecome for the time
Change amount, unit h；ρ lFor fluid density in pit shaft, units/kg/m3；G is acceleration of gravity；S aFor oil jacket annular space sectional area, unit
m2；
（2）The oil well output under different pressures is calculated, and pressure-yield data is fitted to Inflow Performance Relationship In OilwellsQ s(p)。
Obtaining Inflow Performance Relationship In OilwellsQ s(p) on the basis of, further include passing through a little（p e, 0）To oil well inflow performance song
LineQ s(p) correct.
Oil well pump efficiency curve is obtained in the step 2η(t) method be：
（1）After oil well drives a well, in the pressure decline curves P that drives a wellr ’(t) at arbitrary pressure spot, according to the when interval in any two points
Δ t and pressure change, elta P calculate oil well pump efficiency：
；
In formula：Q sFor stratum filtration amount, unit m3；Q pFor oilwell produced fluid amount, unit m3；f pFor oil pump plunger piston sectional area, unit
m2；sFor oil well stroke, unit m；N is oil well jig frequency, unit min-1；
（2）Oil well pump efficiency under different pressures is calculated, and pressure-pump efficiency data are fitted to pump efficiency curveη(p)；
（3）In conjunction with the pressure decline curves that drive a wellP r ′(t), it willη(p) be converted intoη(t)。
Between take out cycle duration（T2'-T1'）When meeting the following conditions：
；
Then according to electricity price information, adjustment specifically drives a well moment and closing well moment, as makes well opening time paragraph relatively low in electricity price as possible
Period in, reduce electric cost, reach cost for oil production minimum.
The technical effects of the invention are that：
The present invention is using the bottom pressure data surveyed as calculation basis, and using maximum production as principle, that well is taken out between determining stops well
Pressure and the pressure that drives a well, so that it is determined that taking out system between pumping well, capable of eliminating hydrodynamic face, there are hydrodynamic faces caused by foam section
Convert error caused by bottom pressure, is also avoided that between formation parameter and computation model inaccuracy cause that take out system inadaptable, from
And the problem of causing oil well production potentiality not excavated fully；Can also be taken out between guarantee well production it is maximum under the premise of, according to
Electricity price information is advanced optimized and is specifically driven a well moment and closing well moment, reduces electric cost.
Description of the drawings
Fig. 1 is low permeability oil field oil well interval pumping system formulation flow chart.
Fig. 2 is the pressure curves of certain pumping well.
Fig. 3 is shut-in pressure recovery curve processing flow schematic diagram.
Fig. 4 is Inflow Performance Relationship In OilwellsQ S(p) schematic diagram.
Fig. 5 is the pressure decline curves processing flow schematic diagram that drives a well.
Fig. 6 is oil well pump efficiency curveη(t) schematic diagram.
Fig. 7 be withp0 takes out the process schematic for being determined when stopping taking out pressure and opening and taking out pressure as between.
Fig. 8 is to determine the process schematic of optimal pumping system of oil well.
Fig. 9 is that electricity price information is combined to determine that oil well specifically opens the process schematic taken out the moment and stop taking out the moment.
Specific implementation mode
Illustrate the specific implementation mode of this method with the example of a well below.Certain oil well basic data is as follows：Oil pumping
Pump pump diameter：44mm；Pumping unit stroke：1.2m；Jig frequency：6min-1；Casing inner diameter：124mm；Oil pipe outer diameter：73mm；Pump setting depth：
415m, system of being taken out between current are to open 4 hours, are closed 20 hours, daily fluid production rate：0.42m3/d。
Step 1：Measure oil well pressure data；
Step 1-1：Bottom hole pressure bomb under oil well operation；
Step 1-2：Oil well opens pumping, until oilwell produced fluid amount stops taking out when stable or suitable with original Liquid output；
Step 1-3：Oil well pressure recovery time is determined according to oil well geological conditions, and stopping the well time reaches rear oil well and open pumping；
Step 1-4：Oilwell produced fluid amount stops taking out when stable or suitable with original Liquid output；
Step 1-5：Oil well closing well takes out bottom hole pressure bomb, reads data, as shown in Figure 2.
Step 2：It is fitted shut-in pressure recovery curveP r(t), calculate Inflow Performance Relationship In OilwellsQ S(p)；
Step 2-1：Shut-in pressure recovery data are fitted into curveP r(t)；
Step 2-2：Strata pressure is sought using Well Test Data Analysis Methodp e；
Step 2-3：At the arbitrary pressure spot of shut-in pressure recovery curve, according to the when interval delta in any two pointstBecome with pressure
Change ΔpOil well output is calculated, as shown in Figure 3：
；
In formula：ΔhFor dynamic liquid level height variable quantity, unit m；ΔpFor bottom pressure variable quantity, units MPa；ΔtBecome for the time
Change amount, unit h；ρ lFor fluid density in pit shaft, units/kg/m3；G is acceleration of gravity；S aFor oil jacket annular space sectional area, unit
m2；
Step 2-3 is repeated, the oil well output curve under different pressures is calculated；
Step 2-4：Pressure will be calculated -- yield data is fitted to curveQ s(p)；
Step 2-5：Using point（p e, 0）Fair curveQ s(p), as shown in Figure 4.
Step 3：It is fitted the pressure decline curves that drive a wellP r ′(t), oil well pump efficiency curve is calculatedη(t)；
Step 3-1：Preferably, drop data is fitted into curve under the pressure that will drive a wellP r ′(t)；
Step 3-2：At the arbitrary pressure spot of the pressure decline curves that drive a well, according to the when interval delta in any two pointstBecome with pressure
Change ΔpOil well pump efficiency is calculated, as shown in Figure 5：
After oil well drives a well, the variation of oil well flowing bottomhole pressure (FBHP) is influenced by stratum filtration amount and artificial lift amount.Under different flowing bottomhole pressure (FBHP)s
Oil well pump efficiency can following equation group calculate：
；
In formula：Q sFor stratum filtration amount, unit m3；Q pFor oilwell produced fluid amount, unit m3；f pFor oil pump plunger piston sectional area, unit
m2；sFor oil well stroke, unit m；N is oil well jig frequency, unit min-1；
Step 3-2 is repeated, the oil well pump efficiency under different pressures is calculated；
Step 3-3：Preferably, pressure will be calculated -- the curve that pump efficiency data are fitted toη(p)；
Step 3-4：Preferably, in conjunction with the pressure decline curves that drive a wellP r ′(t), it willη(p) be converted intoη(t), as shown in Figure 6.
Step 4：Optimal closed-in time and well opening time are determined according to maximum production principle；
Step 4-1：With oil well not between take out when oil well flowing bottomhole pressure (FBHP)p0 be between take out when stop take out pressure,p0 restores in shut-in pressure
CurveP r(t) on corresponding time pointT1,p0 with the pressure decline curves that drive a wellP r ′(t) on corresponding time pointT2, such as
Shown in Fig. 7；
Step 4-2：By shut-in pressure recovery curveP r(t) on select any point（t,p）The pressure of pumping is opened as oil well, is counted
Calculate the oil well output taken out between one in the periodQWith regarding the daily output；
；
Step 4-3：Selection difference opens pumping pressure, repeats step 3-1, calculates different open and regards the daily output, such as Fig. 7 under pumping pressure
It is shown；
Step 4-4：Compare different open and regard the daily output under pumping pressure, is to stop taking out pressure depending on working system when daily output maximumpOptimal of 0 pumping system, stopping the well time is（t-T1）, well opening time is（T2-t）；
Step 4-5：Select it is different stop taking out pressure, repeat step 3-1, step 3-2, step 3-3, step 3-4, calculate a series of
Stop taking out the maximum under pressure and regard the daily output, corresponding working system is optimal pumping system of oil well depending on the maximum value of the daily output
Degree.Assuming that stopping taking out pressurep1, opening pumping pressure isp'When to regard the daily output maximum,p1 in shut-in pressure recovery curveP r(t) on pair
The time point answeredT1',p1 with the pressure decline curves that drive a wellP r ′(t) on corresponding time pointT2',p'It is corresponding when being
Between bet', then optimal pumping system of oil well is to stop well（t'-T1'）Hour, it drives a well（T2'-t'）Hour, take out the period between one
Duration（T2'-T1'）Hour, as shown in Figure 8.
It brings instance data into optimal system is calculated and be：Closed-in time is 28.2 hours, is switched on 0.6 hour, one
Between take out cycle duration 28.8 hours, average daily output is 0.433m3/d。
Step 5：Preferably, if pumping cycle duration（T2'-T1'）Meet：
Then according to electricity price information, adjustment specifically drives a well moment and closing well moment, as makes well opening time paragraph relatively low in electricity price as possible
Period in, reduce electric cost, reach cost for oil production minimum, as shown in Figure 9.
28.8 hours periods of pumping are unsatisfactory for formula 4 because between, specifically drive a well moment and closing well moment so being not required to adjustment adjustment；
Assuming that taking out system between last is closing well 8 hours, drive a well 4 hours, electricity price is 6 at times in oil recovery factory location:00—22：00 is
0.55 yuan, 22:00—6：00 is 0.35 yuan, then can determine that the daily closed-in time section of oil well is：2:00—10：00 and 14:
00—22：00, daily well opening time section is：10:00—14：00 and 22:00—2：00.
Claims (7)
1. a kind of low permeability oil field oil well interval pumping method, it is characterised in that：Include the following steps：
Step 1：It is fitted shut-in pressure recovery curveP r(t), and according to shut-in pressure recovery curveP r(t) obtain strata pressurep e
And Inflow Performance Relationship In OilwellsQ S(p)；With oil well not between take out when oil well flowing bottomhole pressure (FBHP)p0 be between when taking out stop take out pressure, and look for
Go outp0 in shut-in pressure recovery curveP r(t) on corresponding time pointT1；
Step 2：It is fitted the pressure decline curves that drive a wellP r ′(t), it finds outp0 with the pressure decline curves that drive a wellP r ′(t) on it is corresponding when
Between pointT2；According to the pressure decline curves that drive a wellP r ′(t) obtain oil well pump efficiency curveη(t)；
Step 3：With shut-in pressure recovery curveP r(t) on any point（t,p）Pumping pressure is opened as oil well, is taken out between calculating one
Oil well output in periodQWith regarding the daily output；
；
Step 4：It calculates different open and regards the daily output under pumping pressure, to be to stop taking out pressure depending on working system when daily output maximumpOptimal when 0 pumping system, stopping the well time is（t-T1）, well opening time is（T2-t）；
Step 5：Select it is different stop taking out pressure, calculate a series of maximums for stopping taking out under pressure and regard the daily output, most depending on the daily output
It is worth the optimal pumping system that corresponding working system is oil well greatly.
2. a kind of low permeability oil field oil well interval pumping method according to claim 1, it is characterised in that：It further include step 6：Knot
It closes electricity price information and adjusts oil well interval pumping system, and determine specific closing well moment and booting moment, realize economic optimum.
3. a kind of low permeability oil field oil well interval pumping method according to claim 2, it is characterised in that：The strata pressurep eIt is obtained by Well Test Data Analysis Method.
4. a kind of low permeability oil field oil well interval pumping method according to claim 3, it is characterised in that：In the step 1
Inflow Performance Relationship In OilwellsQ S(p) method be：
（1）In shut-in pressure recovery curve Pr(t) at arbitrary pressure spot, according in any two points when interval t and pressure become
Change P and calculates oil well output：
；
In formula：∆hFor dynamic liquid level height variable quantity, unit m；∆pFor bottom pressure variable quantity, units MPa；∆tBecome for the time
Change amount, unit h；ρ lFor fluid density in pit shaft, units/kg/m3；G is acceleration of gravity；S aFor oil jacket annular space sectional area, unit
m2；
（2）The oil well output under different pressures is calculated, and pressure-yield data is fitted to Inflow Performance Relationship In OilwellsQ s(p)。
5. a kind of low permeability oil field oil well interval pumping method according to claim 4, it is characterised in that：It is flowed into obtaining oil well
Performance graphQ s(p) on the basis of, further include passing through a little（p e, 0）To Inflow Performance Relationship In OilwellsQ s(p) correct.
6. a kind of low permeability oil field oil well interval pumping method according to claim 5, it is characterised in that：In the step 2
Obtain oil well pump efficiency curveη(t) method be：
（1）After oil well drives a well, in the pressure decline curves P that drives a wellr ’(t) at arbitrary pressure spot, according to the when interval in any two points
T and pressure change P calculate oil well pump efficiency：
；
In formula：Q sFor stratum filtration amount, unit m3；Q pFor oilwell produced fluid amount, unit m3；f pFor oil pump plunger piston sectional area, unit
m2；sFor oil well stroke, unit m；N is oil well jig frequency, unit min-1；
（2）Oil well pump efficiency under different pressures is calculated, and pressure-pump efficiency data are fitted to pump efficiency curveη(p)；
（3）In conjunction with the pressure decline curves that drive a wellP r ′(t), it willη(p) be converted intoη(t)。
7. a kind of low permeability oil field oil well interval pumping method according to claim 6, it is characterised in that：Between take out cycle duration
（T2'-T1'）When meeting the following conditions：
According to electricity price information, adjustment specifically drives a well moment and closing well moment, as makes well opening time paragraph lower in electricity price as possible
In period, electric cost is reduced, reaches cost for oil production minimum.
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| CN109958431A (en) * | 2019-04-19 | 2019-07-02 | 中国石油天然气股份有限公司 | A method of oil well daily fluid production rate is calculated based on inflow performance relationship curve |
| CN110059954A (en) * | 2019-04-17 | 2019-07-26 | 陕西安控科技有限公司 | A kind of high-precision function figure meter production amendment statistical method |
| CN110766562A (en) * | 2019-09-25 | 2020-02-07 | 中国石油天然气股份有限公司 | Method for determining oil well interval pumping time |
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| CN112112604A (en) * | 2019-06-19 | 2020-12-22 | 中国石油天然气股份有限公司 | Method and device for controlling pumping rows between low-permeability oil wells |
| CN112112604B (en) * | 2019-06-19 | 2023-02-24 | 中国石油天然气股份有限公司 | Method and device for controlling pumping rows between low-permeability oil wells |
| CN110766562A (en) * | 2019-09-25 | 2020-02-07 | 中国石油天然气股份有限公司 | Method for determining oil well interval pumping time |
| CN110766562B (en) * | 2019-09-25 | 2022-12-02 | 中国石油天然气股份有限公司 | Method for determining oil well interval pumping time |
| CN112580851A (en) * | 2020-11-17 | 2021-03-30 | 西安中控天地科技开发有限公司 | Cluster well site pumping unit well group peak-staggering well-opening pumping row scheduling method |
| CN113298669A (en) * | 2020-12-09 | 2021-08-24 | 中国石油天然气股份有限公司 | Method and device for determining pumping period of pumping well based on pressure recovery data |
| CN113298669B (en) * | 2020-12-09 | 2024-03-01 | 中国石油天然气股份有限公司 | Method and device for determining pumping period of pumping well based on pressure recovery data |
| CN113700460A (en) * | 2021-09-30 | 2021-11-26 | 西安健尚智能科技有限公司 | Method for reducing invalid water circulation of oil well and adjusting injection allocation amount of water injection well |
| CN114086926A (en) * | 2021-11-17 | 2022-02-25 | 国网河北省电力有限公司沧州供电分公司 | Control method and device of oil field mechanical recovery system and oil field mechanical recovery system |
| CN114086926B (en) * | 2021-11-17 | 2024-03-01 | 国网河北省电力有限公司沧州供电分公司 | Control method and device of oilfield mechanical extraction system and oilfield mechanical extraction system |
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