CN106127597A - A kind of method predicting fine and close low-permeability oil deposit water injection pressure - Google Patents

A kind of method predicting fine and close low-permeability oil deposit water injection pressure Download PDF

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Publication number
CN106127597A
CN106127597A CN201610479848.6A CN201610479848A CN106127597A CN 106127597 A CN106127597 A CN 106127597A CN 201610479848 A CN201610479848 A CN 201610479848A CN 106127597 A CN106127597 A CN 106127597A
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pressure
water injection
fine
crack
low
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曾联波
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China University of Petroleum Beijing CUPB
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China University of Petroleum Beijing CUPB
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    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06QDATA PROCESSING SYSTEMS OR METHODS, SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL, SUPERVISORY OR FORECASTING PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL, SUPERVISORY OR FORECASTING PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q10/00Administration; Management
    • G06Q10/04Forecasting or optimisation, e.g. linear programming, "travelling salesman problem" or "cutting stock problem"
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06QDATA PROCESSING SYSTEMS OR METHODS, SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL, SUPERVISORY OR FORECASTING PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL, SUPERVISORY OR FORECASTING PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q50/00Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
    • G06Q50/02Agriculture; Fishing; Mining

Abstract

The present invention relates to a kind of method predicting fine and close low-permeability oil deposit water injection pressure, comprise the following steps: (1) utilizes rock core, well logging and test analysis data, determine region to be measured internal fissure occurrence, stress direction and size;(2) determine that pressure is opened in the underground in different directions crack;(3) according to described unlatching pressure size and unlatching sequence prediction water injection pressure marginal value.During described method may determine that fine and close low-permeability oil ensconces waterflooding extraction, water injection well and the opening sequence in earth layer around oil well different directions crack, determine marginal value or the higher limit of On The Reasonable Injection Pressure, Fractured water breakthrough and the sudden water flooding of oil well can be efficiently controlled, improve fine and close waterflood development of low-permeability reservoirs effect, can be widely applied to, in China's densification water injection in low-permeability oilfield exploitation, provide geologic basis for China's densification low permeability oil field high efficient rational development.

Description

A kind of method predicting fine and close low-permeability oil deposit water injection pressure
Technical field
The present invention relates to oil-gas geology and reservoir engineering field, be specifically related to one and determine fine and close low-permeability oil deposit water filling The new method of pressure.
Background technology
Fine and close low-permeability oil deposit intrinsic fracture is generally grown, the fast even waterfall of the well water rate of climb caused due to crack Property water logging be the principal element of the fine and close waterflood development of low-permeability reservoirs effect of impact, the rate of water cut increase reducing oil well is to improve The key of fine and close waterflood development of low-permeability reservoirs effect, its core is how to control water injection pressure.
At present, the conventional way controlling water injection pressure is based on the fracture pressure on stratum and controls water filling, i.e. thinks water filling Pressure is safe less than the fracture pressure on stratum.Therefore by formation fracture pressure (Pf) as oil-field flooding upper limit of pressure Value, its computational methods are: Pf=3 σ31-Pe+St;In this formula, PfFor formation fracture pressure;σ1、σ3It is respectively and shows stress field Minimum and maximum principal stress;PeFor pore pressure;StFor the tensile strength containing crack rock.But, a large amount of water injection in low-permeability oilfield Developing actual showing, when water injection pressure is also far from reaching formation fracture pressure, oil well crack water breakthrough and sudden water flooding are Occur.If controlling water filling according further to traditional formation fracture pressure as the upper injection pressure limit, it is difficult to ensure water filling safety.
Summary of the invention
It is an object of the invention to overcome the defect of prior art, it is provided that a kind of determine fine and close low-permeability oil deposit water injection pressure New method.The method can predict the critical water injection pressure of every mouthful of well, determines for every mouthful of well saliva well On The Reasonable Injection Pressure and provides reason Opinion foundation, can improve the waterflooding development effect of fine and close low-permeability oil deposit.
Specifically, the method for the invention comprises the following steps:
(1) region to be measured in fine and close low-permeability oil deposit is determined, according to rock core, well logging and test analysis data, it is thus achieved that institute State the Rock Poisson Ratio Using μ in region to be measured, target zone buried depth H, fracture dip θ, rock unit weight ρS, pore fluid pressure Pe、 Maximum horizontal main crustal stress σ now1, minimum level main crustal stress σ now3And the folder of present daygeodynamics direction and fracture strike Angle beta;
(2) the unlatching pressure in crack in all directions is determined in described region to be measured;Arbitrarily on single direction, crack is opened Pressure PiComputational methods as shown in formula I:
P i = μ 1 - μ Hρ s s i n θ + Hρ s c o s θ - P e + σ 1 sin θ s i n β + σ 3 sin θ c o s β - - - I ;
(3) open the size of pressure value according to crack in all directions of step (2) gained, determine that unlatching pressure is minimum Opening direction and the unlatching pressure value P of correspondencemin, with described PminFor the marginal value of water injection pressure in region to be measured.
In described formula I, PiPressure, units MPa is opened for crack;μ is Rock Poisson Ratio Using, dimensionless;For the purpose of H, layer buries Hide the degree of depth, unit km;θ is fracture dip, unit degree;ρSFor rock unit weight, unit 103kg/m3;PeFor pore fluid pressure, list Position MPa;σ1、σ3Be respectively the most now maximum horizontal main ground should and minimum horizontal principal stress, units MPa;β is present daygeodynamics direction With the angle of fracture strike, unit degree.
Wherein, the method that specifically determines of each parameter is the conventional method of this area, and the present invention does not do particular determination.Example As, described μ can calculate with Sonic Logging Data or be obtained by petrophysics experiment;Described θ can be obtained by core observation;Described σ1、σ3Big I tried to achieve by well-log information or empirical parameter;The occurrence that described β can be observed with rock core crack by stress direction It is calculated.
In described step (3), for the ease of operation, first pressure can be opened according to crack in all directions of step (2) gained The size of power numerical value, is ranked up the opening sequence in crack in all directions according to ascending order, opens pressure Little fractuer direction row is first, then the unlatching force value that the direction is corresponding is Pmin, then can be identified as in region to be measured The marginal value of water injection pressure.
The water injection pressure marginal value that the present invention tries to achieve refers to the higher limit during practice of construction, i.e. need this numerical value with Under pressure condition under carry out constructing operation.
The new method of the fine and close low-permeability oil deposit water injection pressure of prediction that the present invention provides, it may be determined that at fine and close low-permeability oil During ensconcing waterflooding extraction, water injection well and the opening sequence in earth layer around oil well different directions crack, determine Reasonable Injection hydraulic pressure The marginal value of power or higher limit, can efficiently control Fractured water breakthrough and the sudden water flooding of oil well, improves fine and close low-permeability oil Hide waterflooding development effect, can be widely applied in China's densification water injection in low-permeability oilfield exploitation, for China's densification low-permeability oil Field high efficient rational development provides geologic basis.
Accompanying drawing explanation
Fig. 1 is the fine and close water injection in low-permeability oilfield pressure prediction scattergram of Ordos Basin;Wherein, by different colors Represent different water injection pressure values;In figure, the combination of " letter+numeral " represents pound sign, without particular meaning.
Detailed description of the invention
Following example are used for illustrating the present invention, but are not limited to the scope of the present invention.
The On The Reasonable Injection Pressure of the fine and close low permeability oil field of present invention oil-gas bearing basin multiple to Bohai Sea Gulf, Erdos etc. Predicted, effectively direct fine and close waterflood development of low-permeability reservoirs, achieve significant effect.
Embodiment 1
Bohai gulf basin block formation fracture pressure is 49.0MPa, and conventionally, this bottom fracture pressure is The upper injection pressure limit value.But under practical situation, the actual crack that this oil field obtains according to the water suction indicative curve of water injection well is opened Opening pressure is 41.1MPa, reflects that this oil field reaches 41.1MPa (for bottom pressure) when water injection pressure, is also far from reaching ground During layer fracture pressure (49.0MPa), Fractured water breakthrough and the sudden water flooding of oil well are had resulted in.As can be seen here, according to tradition The force value (49.0Mpa) that method determines is compared with actual value (41.1MPa), and error has reached 19.2%, conventionally Operation has bigger construction risk.
The present embodiment uses following steps to be predicted this region the upper injection pressure limit value, concretely comprises the following steps:
(1) utilize rock core, well logging and test analysis data, determine that region to be measured internal fissure produces
Shape, stress direction and size;
(2) according to formula I, determine different directions crack underground open pressure:
P i = μ 1 - μ Hρ s s i n θ + Hρ s c o s θ - P e + σ 1 sin θ s i n β + σ 3 sin θ c o s β - - - I ;
In described formula I, PiPressure, units MPa is opened for crack;μ is Rock Poisson Ratio Using, dimensionless;For the purpose of H, layer buries Hide the degree of depth, unit km;θ is fracture dip, unit degree;ρSFor rock unit weight, unit 103kg/m3;PeFor pore fluid pressure, list Position MPa;σ1、σ3Be respectively the most now maximum horizontal main ground should and minimum horizontal principal stress, units MPa;β is present daygeodynamics direction With the angle of fracture strike, unit degree;
Specifically, described μ is 0.19~0.217;H is 2.675km~3.784km;θ is 85~89 degree;ρSBe 2.3~ 2.35(103kg/m3);PeIt is 2.7~3.9MPa;σ1It is 44.6~69.8MPa, σ3It is 38.1~60.3MPa;β is 0~5 degree;
(3) open the size of pressure value according to crack in all directions of step (2) gained, determine that unlatching pressure is minimum Opening direction and the unlatching pressure value P of correspondencemin=42.9MPa, is the facing of water injection pressure in region to be measured with 42.9MPa Dividing value.
It is 42.9MPa that above method prediction obtains this region the upper injection pressure limit value, compared with actual value (41.1MPa), Error is only 4.4% (traditional method error is 19.2%), basically identical with actual crack unlatching pressure, respond well.
Embodiment 2
In the fine and close low infiltration sandrock oil field of Ordos Basin, following steps are used to predict that this region water injection pressure is critical Value, gained water injection pressure marginal value on individual well and plane distribution results as shown in table 1 and Fig. 1.Investigate through reality, above prediction It is basically identical that pressure is opened in result and actual crack.
Provide reliable geologic basis for the exploitation of this densification water injection in low-permeability oilfield, thus reduce development risk This.
Table 1: the fine and close low permeability oil field individual well water injection pressure prediction data table of Ordos Basin
Although, used general explanation, detailed description of the invention and test, the present invention made detailed retouching Stating, but on the basis of the present invention, can make some modifications or improvements it, this is apparent to those skilled in the art 's.Therefore, these modifications or improvements without departing from theon the basis of the spirit of the present invention, belong to claimed Scope.

Claims (5)

1. the method predicting fine and close low-permeability oil deposit water injection pressure, it is characterised in that comprise the steps:
(1) determine the region to be measured in fine and close low-permeability oil deposit, according to rock core, well logging and test analysis data, it is thus achieved that described in treat Survey the Rock Poisson Ratio Using μ in region, target zone buried depth H, fracture dip θ, rock unit weight ρS, pore fluid pressure Pe, now Maximum horizontal main crustal stress σ1, minimum level main crustal stress σ now3And the angle β of present daygeodynamics direction and fracture strike;
(2) the unlatching pressure in crack in all directions is determined in described region to be measured;Arbitrarily on single direction, pressure P is opened in cracki Computational methods as shown in formula I:
P i = μ 1 - μ Hρ s s i n θ + Hρ s c o s θ - P e + σ 1 sin θ s i n β + σ 3 sin θ c o s β - - - I ;
(3) open the size of pressure value according to crack in all directions of step (2) gained, determine and open minimum the opening of pressure Open the unlatching pressure value P of direction and correspondence thereofmin, with described PminFor the marginal value of water injection pressure in region to be measured.
Method the most according to claim 1, it is characterised in that μ is to calculate or by rock physics with Sonic Logging Data Experiment obtains.
Method the most according to claim 1, it is characterised in that θ is to be obtained by core observation.
Method the most according to claim 1, it is characterised in that σ1、σ3Size and method by well-log information or empirical parameter Try to achieve.
Method the most according to claim 1, it is characterised in that the occurrence meter that β is observed with rock core crack by stress direction Obtain.
CN201610479848.6A 2016-06-27 2016-06-27 A kind of method predicting fine and close low-permeability oil deposit water injection pressure Pending CN106127597A (en)

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
CN107679999A (en) * 2017-07-05 2018-02-09 中国石油天然气股份有限公司 A kind of method and its system for calculating coal bed gas well fracture pressure
CN109973068A (en) * 2019-03-05 2019-07-05 中国石油大学(北京) The recognition methods of reservoir water induced fractures and device

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US20090259446A1 (en) * 2008-04-10 2009-10-15 Schlumberger Technology Corporation Method to generate numerical pseudocores using borehole images, digital rock samples, and multi-point statistics

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107679999A (en) * 2017-07-05 2018-02-09 中国石油天然气股份有限公司 A kind of method and its system for calculating coal bed gas well fracture pressure
CN107679999B (en) * 2017-07-05 2020-11-06 中国石油天然气股份有限公司 Method and system for calculating fracture pressure of coal-bed gas well
CN109973068A (en) * 2019-03-05 2019-07-05 中国石油大学(北京) The recognition methods of reservoir water induced fractures and device

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Application publication date: 20161116