CN105956712A - Fracture-vug type carbonate reservoir water breakthrough early warning method - Google Patents
Fracture-vug type carbonate reservoir water breakthrough early warning method Download PDFInfo
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- CN105956712A CN105956712A CN201610329558.3A CN201610329558A CN105956712A CN 105956712 A CN105956712 A CN 105956712A CN 201610329558 A CN201610329558 A CN 201610329558A CN 105956712 A CN105956712 A CN 105956712A
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- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
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Abstract
A fracture-vug type carbonate reservoir water breakthrough early warning method of the present invention relates to an oil well water breakthrough early warning method, and aims to determine the water invasion time timely, optimize a working system, prolong an oil well water-free oil production period, and improve the oil well recovery efficiency. The method of the present invention comprises the following the steps of S01 obtaining the oil pressure drop under different accumulative liquid volumes according to a matter balance equation, and drawing a relational graph of the oil well pressure drop and the accumulative liquid volume; S02 for the non-water breakthrough reservoir, if a oil well pressure drop and accumulative liquid volume curve deviates, explaining three possible phenomena: (1) the crude oil is degassed in a shaft or stratum; (2) a new reservoir is exploited; (3) the edge-bottom water begins to invade; S03 excluding the two situations that the crude oil is degassed in the shaft or stratum and the new reservoir is exploited to determine that the reservoir edge-bottom water begins to invade; S04 determining the water invasion time according to the relational graph of the oil well pressure drop and the accumulative liquid volume, and carrying out the water breakthrough early warning.
Description
Technical field
The present invention relates to a kind of oil reservoir water breakthrough method for early warning.
Background technology
Harrar Ha Tang oil field, Tarim Basin ORDOVICIAN CARBONATE oil reservoir reservoir space is based on crack solution cavity, polus animalium
Irregularly, anisotropism is strong, much preserves larger oil reservoir simultaneously with the presence of bottom water.Oil well water breakthrough is the master that oil reservoir successively decreases
Reason, a lot of high-yield wells is wanted to cause yield rapid decrement due to aqueous rising.At present, the one-sided reservoir static data and of relying on
The aqueous Changing Pattern understanding having is difficult to water breakthrough early warning, therefore sets up one oil reservoir water breakthrough fast and effectively now with necessity
Method for early warning.
Summary of the invention
The technical problem to be solved in the present invention is to provide one can judge water enchroachment (invasion) time, Optimization Work system in time, prolongs
Long oil well water-free oil production period, improves the fractured-cavernous carbonate reservoir water breakthrough method for early warning of oil well recovery ratio.
Fractured-cavernous carbonate reservoir water breakthrough method for early warning of the present invention, comprises the steps:
S01: according to matter balance equation, asks for the different oil pressure tired out under Liquid output fall, and draws well oil pressure fall and tired product
Liquid measure graph of a relation；
S02: for non-water breakthrough oil reservoir, if oil well pressure drop offsets with tired Liquid output curve, if oil well pressure drop with
Tired Liquid output curve offsets, then there are three kinds of probabilities: 1. crude oil deaerates in pit shaft or stratum, and 2. new Reservoir Body moves
With, 3. edge-bottom water starts invasion；
S03: crude oil deaerates in pit shaft or stratum, new Reservoir Body employs two kinds of situations, determines that oil reservoir edge-bottom water is opened in eliminating
Begin to invade；
S04: judge that water body invades the time according to well oil pressure fall with tiring out Liquid output graph of a relation, carry out water breakthrough early warning.
Fractured-cavernous carbonate reservoir water breakthrough method for early warning of the present invention, for not having gas-cap gas and not having the seam hole type of water filling
Carbonate Reservoir, when reservoir pressure above bubble point pressure, the matter balance equation used in step S01 can be reduced to:
NpBo+WpBw=NBoiCotΔP+We
In formula: NpGround cumulative oil production；BoOil volume factor under strata pressure；
WpGround cumulative water production；BwThe volume factor of formation water；
N oil in place；BoiOil volume factor under reset pressure；
Δ P overall presure drop；WeWater influx；
CotTotal compression coefficient；
One fractured-cavernous carbonate reservoir water breakthrough method for early warning of the present invention, wherein for being in exploitation oil reservoir in early days,
The matter balance equation used in step S01 is:
NpBo=NBoiCotΔP
In formula: NpGround cumulative oil production；BoOil volume factor under strata pressure；
N oil in place；BoiOil volume factor under reset pressure；
CotTotal compression coefficient；Δ P overall presure drop Mpa.
One fractured-cavernous carbonate reservoir water breakthrough method for early warning of the present invention, wherein for being in exploitation oil reservoir in early days,
The matter balance equation used in step S01 is:
Np=NBoiCotΔP
In formula, NpGround cumulative oil production；N oil in place；
BoiOil volume factor under reset pressure；CotTotal compression coefficient；
Δ P overall presure drop.
One fractured-cavernous carbonate reservoir water breakthrough method for early warning of the present invention, wherein in step S03, gets rid of crude oil at pit shaft
Or the method for degassing in stratum, comprise the steps:
S031: crude oil is carried out sampling analysis, obtains the many kinds of parameters of crude oil, then according to the parameter recorded respectively to this
The saturation pressure of oil well carries out recurrence to be asked for；
S032: if oil pressure above bubble point pressure, then crude oil does not deaerates in pit shaft；If oil pressure is less than saturation pressure,
Then crude oil deaerates in pit shaft.
One fractured-cavernous carbonate reservoir water breakthrough method for early warning of the present invention, wherein empirical regression formula in step S031
For:
In formula: PbSaturation pressure；R dissolved gas oil ratio；
rOCrude oil density in stock tank, normal pressure, 20 DEG C；rGNatural gas relative density；
A, b are regression fit coefficient.
One fractured-cavernous carbonate reservoir water breakthrough method for early warning of the present invention, wherein in step S03, gets rid of new Reservoir Body and moves
Method be: in step S03, getting rid of the method that new Reservoir Body employs is: crude oil carries out sampling analysis, obtains oil property
With produce steam oil ratio (SOR), if oil property without substantially changing, production gas-oil ratio is without significant change；And the well oil that S01 step is drawn
Pressure drop and tired Liquid output graph of a relation show that oil pressure increases without saltatory, then getting rid of is that new Reservoir Body is employed.
The present invention a kind of fractured-cavernous carbonate reservoir water breakthrough method for early warning is for karst fracture cave type water outlet type
Multiformity and dynamic complexity, utilize bottom water to advance theory analysis fracture-pore reservoir water logging Mechanism for Warning, judge water enchroachment (invasion) in time
Time, Optimization Work system, extend oil well water-free oil production period, improve oil well recovery ratio.
Below in conjunction with the accompanying drawings one fractured-cavernous carbonate reservoir water breakthrough method for early warning of the present invention is described further.
Accompanying drawing explanation
Fig. 1 is RP-5 well oil pressure and tired Liquid output graph of a relation；
Fig. 2 is RP-5 well production curve.
Detailed description of the invention
One fractured-cavernous carbonate reservoir water breakthrough method for early warning of the present invention, comprises the steps:
S01: according to matter balance equation, asks for the different oil pressure tired out under Liquid output fall, and draws well oil pressure fall and tired product
Liquid measure graph of a relation；Oil pressure can be taken multiple measurements by period, and oil pressure is carried out record.
S02: for non-water breakthrough oil reservoir, if oil well pressure drop offsets with tired Liquid output curve, then having three kinds may
Property: 1. crude oil deaerates in pit shaft or stratum, and 2. new Reservoir Body is employed, and 3. edge-bottom water starts invasion；
S03: crude oil deaerates in pit shaft or stratum, new Reservoir Body employs two kinds of situations, determines that oil reservoir edge-bottom water is opened in eliminating
Begin to invade；
S04: judge that water body invades the time according to well oil pressure fall with tiring out Liquid output graph of a relation, carry out water breakthrough early warning；Wherein bent
Line generation offset point i.e. oil reservoir energy obtains water body prolongation point, and namely water body starts the time of invasion.
According to oil development situation, matter balance equation can be simplified, wherein:
One, for there is no gas-cap gas and there is no the fractured-cavernous carbonate reservoir of water filling, when reservoir pressure is higher than saturation pressure
During power, the matter balance equation used in step S01 can be reduced to:
NpBo+WpBw=NBoiCotΔP+We (1)
In formula: NpGround cumulative oil production m3；BoOil volume factor under strata pressure；
WpGround cumulative water production m3；BwThe volume factor of formation water；
N oil in place m3；BoiOil volume factor under reset pressure；
Δ P overall presure drop MPa；WeWater influx m3；
CotTotal compression coefficient 1/MPa；
Two, for being in exploitation oil reservoir in early days, the matter balance equation used in step S01 can be reduced to:
NpBo=NBoiCotΔP (2)
By (2) formula it can be seen that initial stage oil reservoir pressure drop and NpBoThere is linear relationship.Along with the prolongation of oil reservoir recovery time,
Oil reservoir pressure drop increases, and the intrusion of water body strengthens, and oil reservoir has certain energy supplement, now oil reservoir pressure drop and NpBoOffset straight
Line relation, and then realize oil reservoir water breakthrough early warning.
Further, due to BoChanging with reservoir pressure change, not being one determines value, actual ask for applying more difficult,
But the change of this value is less, uses NpReplace NpBoDo not interfere with oil reservoir pressure drop and NpBoTracing pattern, therefore (2) formula can letter further
Turn to:
Np=NBoiCotΔP (3)
In step S03, get rid of the method that crude oil deaerates in pit shaft or stratum, comprise the steps:
S031: crude oil is carried out sampling analysis, obtains the many kinds of parameters parameter that then basis records of crude oil respectively to this
The saturation pressure of oil well carries out recurrence to be asked for, and wherein empirical regression formula is:
In formula: PbSaturation pressure, MPa；R dissolved gas oil ratio, m3/m3；
rOCrude oil density in stock tank, normal pressure, 20 DEG C；rGNatural gas relative density；
A, b are regression fit coefficient.
S032: compared by the saturation pressure that the oil pressure measured in S01 step obtains with S031, if oil pressure is higher than saturation pressure
Power, then crude oil does not deaerates in pit shaft；If oil pressure is less than saturation pressure, then crude oil deaerates in pit shaft.
In step S03, getting rid of the method that new Reservoir Body employs is: crude oil carries out sampling analysis, obtain oil property and
Produce steam oil ratio (SOR), if oil property without substantially changing, production gas-oil ratio is without significant change；And the well oil pressure that S01 step is drawn
Fall and tired Liquid output graph of a relation show that oil pressure increases without saltatory, then getting rid of is that new Reservoir Body is employed.
The present invention a kind of fractured-cavernous carbonate reservoir water breakthrough method for early warning is for karst fracture cave type water outlet type
Multiformity and dynamic complexity, utilize bottom water to advance theory analysis fracture-pore reservoir water logging Mechanism for Warning, judge water enchroachment (invasion) in time
Time, Optimization Work system, extend oil well water-free oil production period, improve oil well recovery ratio.
In order to verify the effectiveness of fractured-cavernous carbonate reservoir water breakthrough method for early warning of the present invention, RP-5 well is entered by applicant
Water breakthrough early warning of having gone is tested.
First according to matter balance equation, ask for the oil pressure fall under different tired Liquid output, and depict well as shown in Figure 1
Oil pressure drops and tires out Liquid output graph of a relation；The measurement data of oil pressure can be retained by period, with the saturation pressure obtained with follow-up recurrence
Compare.
As shown in Figure 1, oil well pressure drop and tired Liquid output curve start to follow linear relationship, but offset later, thus
Can confirm that this well is non-water breakthrough oil reservoir, additionally cause the reason of curve offset to there are three kinds of probabilities: 1. crude oil is on pit shaft or ground
Deaerating in Ceng, 2. new Reservoir Body is employed, and 3. edge-bottom water starts invasion.
Crude oil is carried out sampling analysis, and the many kinds of parameters obtaining crude oil as shown in Figure 2 (includes dissolved gas oil ratio, ground
Oil density, natural gas relative density and production gas-oil ratio etc.), then saturated to this oil well respectively according to the parameter that records
Pressure carries out recurrence to be asked for.
The saturation pressure that the oil pressure of measurement obtains with recurrence is compared and understands, oil pressure above bubble point pressure, therefore can arrange
Do not deaerate in pit shaft factor except crude oil；
By Fig. 1 and the parameter that records, oil pressure increases without saltatory；Oil property is without substantially changing as shown in Figure 2
Becoming, production gas-oil ratio, without significant change, therefore can be got rid of new Reservoir Body and employ factor；So time may determine that and cause curve inclined
The reason moved is that edge-bottom water starts invasion.
And then to may determine that in Fig. 1 that curve starts time corresponding to offset point be i.e. the Bottom Water Intrusion time.Just because of and
Time judged the water enchroachment (invasion) time, oil nozzle is reduced to 3mm by 4mm by the application talent immediately, it is suppressed that the invasion of edge-bottom water, extends oil
The water-free oil production period of well, improves the recovery ratio of oil well
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 (7)
1. a fractured-cavernous carbonate reservoir water breakthrough method for early warning, comprises the steps:
S01: according to matter balance equation, ask for the oil pressure fall under different tired Liquid output, and draw well oil pressure fall and tire out Liquid output
Graph of a relation；
, if oil well pressure drop offsets with tired Liquid output curve, then there are three kinds of probabilities: 1. in S02: for non-water breakthrough oil reservoir
Crude oil deaerates in pit shaft or stratum, and 2. new Reservoir Body is employed, and 3. edge-bottom water starts invasion；
S03: get rid of crude oil deaerates in pit shaft or stratum, new Reservoir Body employs two kinds of situations, determine oil reservoir edge-bottom water start into
Invade；
S04: judge that water body invades the time according to well oil pressure fall with tiring out Liquid output graph of a relation, carry out water breakthrough early warning.
A kind of fractured-cavernous carbonate reservoir water breakthrough method for early warning the most according to claim 1, it is characterised in that: for not having
There is gas-cap gas and there is no the fractured-cavernous carbonate reservoir of water filling, when reservoir pressure above bubble point pressure, step S01 using
Matter balance equation be:
NpBo+WpBw=NBoiCotΔP+We
In formula, NpGround cumulative oil production；BoOil volume factor under strata pressure；
WpGround cumulative water production；BwThe volume factor of formation water；
N oil in place；BoiOil volume factor under reset pressure；
Δ P overall presure drop；WeWater influx；
CotTotal compression coefficient.
A kind of fractured-cavernous carbonate reservoir water breakthrough method for early warning the most according to claim 1, it is characterised in that: for place
In exploitation oil reservoir in early days, the matter balance equation used in step S01 is:
NpBo=NBoiCotΔP
In formula, NpGround cumulative oil production；BoOil volume factor under strata pressure；
N oil in place；BoiOil volume factor under reset pressure；
CotTotal compression coefficient；Δ P overall presure drop Mpa.
A kind of fractured-cavernous carbonate reservoir water breakthrough method for early warning the most according to claim 1, it is characterised in that: for place
In exploitation oil reservoir in early days, the matter balance equation used in step S01 is:
Np=NBoiCotΔP
In formula, NpGround cumulative oil production；N oil in place；
BoiOil volume factor under reset pressure；CotTotal compression coefficient；
Δ P overall presure drop.
A kind of fractured-cavernous carbonate reservoir water breakthrough method for early warning the most according to claim 1, it is characterised in that: step
In S03, get rid of the method that crude oil deaerates in pit shaft or stratum, comprise the steps:
S031: crude oil is carried out sampling analysis, obtains the many kinds of parameters of crude oil, then according to the parameter recorded respectively to this oil well
Saturation pressure carry out recurrence and ask for；
S032: if oil pressure above bubble point pressure, then crude oil does not deaerates in pit shaft；If oil pressure is less than saturation pressure, the most former
Oil deaerates in pit shaft.
A kind of fractured-cavernous carbonate reservoir water breakthrough method for early warning the most according to claim 5, it is characterised in that: step
In S031, empirical regression formula is:
In formula: PbSaturation pressure；R dissolved gas oil ratio；
rOCrude oil density in stock tank, normal pressure, 20 DEG C；rGNatural gas relative density；
A, b are regression fit coefficient.
A kind of fractured-cavernous carbonate reservoir water breakthrough method for early warning the most according to claim 5, it is characterised in that: step
In S03, getting rid of the method that new Reservoir Body employs is: crude oil carries out sampling analysis, obtains oil property and produces steam oil ratio (SOR), as
Really oil property without substantially changing, production gas-oil ratio is without significant change；And the well oil pressure that S01 step is drawn drops and tires out Liquid output pass
Be that figure shows that oil pressure increases without saltatory, then getting rid of is that new Reservoir Body is employed.
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| CN106837273A (en) * | 2017-01-11 | 2017-06-13 | 西南石油大学 | The double solution cavity Reservoir Body water injection indication curve interpretation models of Carbonate Reservoir |
| CN107366533A (en) * | 2017-08-02 | 2017-11-21 | 中国石油天然气股份有限公司 | The determination method and apparatus of the yield increase of oil reservoir |
| CN108446511A (en) * | 2018-03-28 | 2018-08-24 | 中国石油化工股份有限公司 | The reserve forecasting method of fracture-pore reservoir oil, water |
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| CN109915122A (en) * | 2019-03-04 | 2019-06-21 | 中国地质大学（武汉） | The method for invading water influx using global equation calculation fracture-pore reservoir Stationary Water |
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| CN111680814A (en) * | 2019-03-11 | 2020-09-18 | 中国石油化工股份有限公司 | Elastic-driven reasonable production allocation optimization method for fractured-vuggy carbonate reservoir |
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| CN109918722B (en) * | 2019-01-30 | 2022-11-18 | 中国石油大学(华东) | Method for predicting water breakthrough time of fracture-cavity type oil reservoir oil well under data driving |
| CN109915124A (en) * | 2019-03-04 | 2019-06-21 | 中国地质大学（武汉） | Utilize the method for global equation calculation fracture-pore reservoir quasi-stable state water enchroachment (invasion) water influx |
| CN109918769A (en) * | 2019-03-04 | 2019-06-21 | 中国地质大学（武汉） | Utilize the method for instantaneous equation calculation fracture-pore reservoir unstable state water enchroachment (invasion) water influx |
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Application publication date: 20160921 |