CN106050196A - Method for determining good transfer-injection opportunity for early polymer injection of offshore heavy oil reservoir - Google Patents

Method for determining good transfer-injection opportunity for early polymer injection of offshore heavy oil reservoir Download PDF

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CN106050196A
CN106050196A CN201610407102.4A CN201610407102A CN106050196A CN 106050196 A CN106050196 A CN 106050196A CN 201610407102 A CN201610407102 A CN 201610407102A CN 106050196 A CN106050196 A CN 106050196A
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opportunity
water
tuberculosis
optimal
poly
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CN106050196B (en
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叶仲斌
朱诗杰
施雷庭
蔡冬梅
袁晨阳
李亚丽
徐金腾
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Southwest Petroleum University
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Southwest Petroleum University
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP 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
    • E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP 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
    • E21B43/01—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells specially adapted for obtaining from underwater installations
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP 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
    • E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
    • E21B43/20—Displacing by water

Abstract

The invention discloses a method for determining the good transfer-injection opportunity for early polymer injection of an offshore heavy oil reservoir. The method includes the following steps that (1) the permeability relation of oil and water, or oil and polymers is obtained through a core oil-water/oil-polymer permeability experiment and serves as the basis; (2) the change relation of the mobility ratio along with the water saturation is analyzed through a mobility ratio formula, and the transfer-injection opportunity is judged with the boundary that M is smaller than or equal to 1; (3) the moisture content and the relation between the moisture content changing rate and the oil reservoir water saturation are further analyzed; and (4) through comparison, it is found that the peak value of the moisture content changing rate is consistent with the water saturation obtained when M is equal to 1. The good transfer-injection opportunity for early polymer injection is determined according to the peak value of the moisture content changing rate. The transfer-injection opportunity of polymer flooding is guided with theoretical basis through the method, and the good transfer-injection opportunity of the offshore heavy oil reservoir can be quickly and accurately determined.

Description

A kind of determination method on Offshore Heavy Oil Field oil reservoir in early days note poly-preferable tuberculosis opportunity
Technical field
The invention belongs to Petroleum Processing Technology field, when being specifically related to a kind of Offshore Heavy Oil Field oil reservoir poly-preferable tuberculosis of note in early days The determination method of machine.
Background technology
Technique of polymer flooding is full-fledged at China's onshore oil field, through continuous research of technique, applies to sea in 2007 The polymer flooding exploitation of upper heavy crude reservoir.But due to the aging effects by offshore platform, Speeding up development efficiency imperative ( Virtuous pine, Sun Fu street, Feng Guozhi etc. testing in Bohai heavy oil fields research on influence factors of polymer flooding and on-the-spot test [J]. China sea oils Gas, 2007,19 (1): 30-34).
Zhou Shouwei academician proposes marine oil reservoir development new model: obscures one, two, three oil recovery boundary, is created by technology New and innovative technology is integrated, make oil field be rapidly reached peak-production high speed extraction at the operation initial stage, remain vigorous production Power.So, the poly-core content being to develop new model of note in early days.For the polymer flooding of heavy crude reservoir is developed, ought to deposit The most optimal note poly-opportunity, gather relative to High water cut tuberculosis, it is possible to increase recovery ratio amplification further, it is thus achieved that manage most The recovery ratio thought.Constantly study through physical model experiment and numerical simulation: show that heavy crude reservoir polymer flooding contains at oil reservoir Water rate be 0% or relatively low time moisture content under the conditions of the poly-best results of tuberculosis, this result also in the industry scholar be widely recognized as.Oil reservoir Moisture content is 0%, i.e. oil reservoir production development has no water outlet, and this time period is a time range the broadest.And room Interior research is also the experimentation for some block, has some limitations, it is impossible to instruct other different classes of oil Hide, can not quickly determine tuberculosis opportunity.It is therefore desirable to a kind of means differentiate when marine oil reservoir gathers the optimal tuberculosis driving exploitation Machine point.
Summary of the invention
It is an object of the invention to provide a kind of for marine oil reservoir polymer flooding exploitation note in early days poly-optimal tuberculosis opportunity Determine mode, the optimal tuberculosis opportunity that the method can judge that reservoir polymer drives fast and accurately, raw for polymer flooding of heavy oil Producing actual development provides tuberculosis to instruct.
For realizing above-mentioned technical purpose, the present invention proposes the such a heavy crude reservoir poly-optimal tuberculosis of note in early days and sentences opportunity Disconnected method, the method comprises the steps:
Step 1, is oozed experiment mutually and obtains oil-water relative permeability curve by indoor；
Step 2, utilizes mobility ratio formula to profit phase percolation curve, analyzes the relation of water saturation and mobility ratio M；
Step 3, utilizes profit phase percolation curve data, passes through fractional flow equation, it is thus achieved that moisture content is about the pass of water saturation System；
Step 4, to moisture content fw derivation, it is thus achieved that dfw/ dt, it is thus achieved that water-cut variation speed is about the pass of water saturation System；
By the size of water-cut variation speed, step 5, by data analysis, can judge that polymer flooding note in early days is poly- Optimal tuberculosis opportunity.
Further, in described step 1, profit/oily poly-permeability saturation curve, cored φ 25 × 80mm by scene Short rock core, and field ground degassed crude, water is injected on stratum, under formation temperature conditions, uses " cold store enclosure " to measure phase To permeability curve.
Further, by the analysis to step 2 the data obtained figure, it is thus achieved that the optimal tuberculosis scope on opportunity of polymer flooding is M ≤1.In step 2, in viscosity displacements such as mobility ratio M=1 Shi Shi, being to be generally understood as " nearly piston type " displacement, displacement efficiency is relatively Good；Being highly viscous fluid displacement low viscosity fluid when M ＜ 1, displacement efficiency is good；When M ＞ 1, it is that low viscous displacement height glues, i.e. occurs For common " fingering phenomenon ", displacement efficiency declines, and sweep efficiency reduces the most accordingly.
Further, in described step 2, according to mobility ratio formula,
M = λ w λ o = K w ( S w ) k o ( S w ) · μ o μ w
Computational analysis gained water saturation and the relation of mobility ratio M.
Further, in described step 3, fractional flow equation is utilized
f w = 1 1 + 1 M
By relative permeability transformation component flow, it is thus achieved that moisture content is about the relation of water saturation.
Further, in described step 5 by water saturation and the water-cut variation speed about mobility ratio containing water saturation Degree contrasts, and finds that water-cut variation velocity maximum is exactly the value of M=1；Can be by the size of water-cut variation speed Judge the optimal tuberculosis opportunity that polymer flooding in early days note is poly-.
Technique of polymer flooding is contemplated to control oil-water displacement leading edge, expands sweep efficiency, improves displacement efficiency；And it is aqueous When rate rate of change reaches the fastest, show breakthrough of injection water oil reservoir, in oil reservoir during waterflooding extraction, water drive predominant pathway shape Become, and after oil and water mobility ratio M ＞ 1, M rises very rapid, is all unfavorable for the performance of the fluidity control effect of polymer.Institute With, judge tuberculosis opportunity in water-cut variation speed.
The method have the benefit that the present invention provides really on Dinghai during the poly-optimal tuberculosis of heavy crude reservoir polymer flooding note in early days The method of machine, the method can be more simple and quick, accurately obtains the tuberculosis scope on opportunity of heavy crude reservoir polymer flooding, gathers for viscous crude Compound drives production actual development provides tuberculosis to instruct.
Accompanying drawing explanation
The present invention is further detailed explanation with detailed description of the invention below in conjunction with the accompanying drawings.
Fig. 1 is the oil-water relative permeability curve figure under reservoir condition；
Fig. 2 is that moisture content, water-cut variation speed are about the variation relation curve chart of water saturation；
Fig. 3 is the mobility ratio variation relation figure about water saturation；
Fig. 4 is the judgement boundary figure on optimal tuberculosis opportunity under specific reservoir condition.
Detailed description of the invention
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 Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.Based on Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under not making creative work premise Embodiment, broadly falls into the scope of protection of the invention.
Being a kind of embodiment of the present invention as described in Fig. 1～Fig. 4, a kind of heavy crude reservoir note in early days poly-optimal tuberculosis is sentenced opportunity Disconnected method, the method comprises the steps:
(1) related experiment flow process and experiment material, 1. rock core: core φ 25 × 80mm at scene are first prepared；2. crude oil: ground Emaciated face gas crude oil viscosity 122.8mPa s；3. water is injected: mixed water injection water is simulated on stratum." unstable state according to national sector standard Method " measure oil/water permeability saturation curve, such as Fig. 1.
(2) profit phase percolation curve is utilized formula 2 mobility ratio, analyze the relation of mobility ratio M and water saturation, see Fig. 2；
(3) use the fractional flow equation of formula 1 by relative permeability transformation component flow, it is thus achieved that moisture content is about aqueous full Relation with degree；
(4) to moisture content fwDerivation, it is thus achieved that dfw/ dt, it is thus achieved that water-cut variation speed, about the relation of water saturation, is shown in Fig. 3.
(5) mention in oil reservoir physics, during mobility ratio M≤1 of displacing phase and displaced phase, be advantageous for Flooding Efficiency； So ruling here little for M 1, carrying out tuberculosis and gathering, improving displacing phase viscosity, being conducive to controlling mobility ratio, improving sweep efficiency.
(6) by the analysis to (3) (5) the data obtained figure, see Fig. 4, find that the water saturation at M=1 place is As 0.175 water saturation when reaching maximum with moisture content climbing speed.Owing to mobility ratio is in practice, do not allow Easily obtain, so being judged by moisture content and water-cut variation speed, when i.e. moisture content climbing speed reaches maximum For preferable tuberculosis opportunity.
The Offshore Heavy Oil Field reservoir polymer that the present invention provides drives the method in early days note poly-preferable tuberculosis opportunity, it is possible to the fastest Speed obtains the tuberculosis opportunity that Offshore Heavy Oil Field reservoir polymer drives, it is possible to producing actual development for polymer flooding of heavy oil provides tuberculosis to refer to Lead.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention Within god and principle, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.

Claims (7)

1. a heavy crude reservoir poly-optimal tuberculosis determination methods on opportunity of note in early days, it is characterised in that the method comprises the steps:
Step 1, is oozed experiment mutually and obtains oil-water relative permeability curve by indoor；
Step 2, utilizes mobility ratio formula to profit phase percolation curve, analyzes the relation of water saturation and mobility ratio M；
Step 3, utilizes profit phase percolation curve data, passes through fractional flow equation, it is thus achieved that moisture content is about the relation of water saturation；
Step 4, to moisture content fw derivation, it is thus achieved that dfw/dt, it is thus achieved that water-cut variation speed is about the relation of water saturation；
By the size of water-cut variation speed, step 5, by data analysis, can judge that polymer flooding note in early days gathers Good tuberculosis opportunity.
A kind of heavy crude reservoir the most according to claim 1 poly-optimal tuberculosis determination methods on opportunity of note in early days, it is characterised in that In described step 1, profit/oily poly-permeability saturation curve, is the short rock core of φ 25 × 80mm of being cored by scene, and on-the-spot Stock tank oil, water is injected on stratum, under formation temperature conditions, uses " cold store enclosure " to measure permeability saturation curve.
A kind of heavy crude reservoir the most according to claim 1 poly-optimal tuberculosis determination methods on opportunity of note in early days, it is characterised in that By the analysis to step 2 the data obtained figure, it is thus achieved that the optimal tuberculosis scope on opportunity of polymer flooding is M≤1.
A kind of heavy crude reservoir the most according to claim 3 poly-optimal tuberculosis determination methods on opportunity of note in early days, it is characterised in that In step 2, in viscosity displacements such as mobility ratio M=1 Shi Shi, being to be generally understood as " nearly piston type " displacement, displacement efficiency is preferable；? Being highly viscous fluid displacement low viscosity fluid during M ＜ 1, displacement efficiency is good；When M ＞ 1, it is that low viscous displacement height glues, i.e. occurs the most normal " the fingering phenomenon " seen, displacement efficiency declines, and sweep efficiency reduces the most accordingly.
A kind of heavy crude reservoir the most according to claim 1 poly-optimal tuberculosis determination methods on opportunity of note in early days, it is characterised in that In step 2, according to mobility ratio formula,
M = λ w λ o = K w ( S w ) k o ( S w ) . μ o μ w
Computational analysis gained water saturation and the relation of mobility ratio M.
A kind of heavy crude reservoir the most according to claim 1 poly-optimal tuberculosis determination methods on opportunity of note in early days, it is characterised in that In step 3, utilize fractional flow equation
f w = 1 1 + 1 M
By relative permeability transformation component flow, it is thus achieved that moisture content is about the relation of water saturation.
A kind of heavy crude reservoir the most according to claim 1 poly-optimal tuberculosis determination methods on opportunity of note in early days, it is characterised in that In step 5, by contrasting with the water saturation of water-cut variation speed about the water saturation of mobility ratio, find aqueous Rate rate of change maximum is the value of M=1, shows that water-cut variation speed and mobility ratio are related, during velocity maximum It it is the optimal tuberculosis opportunity controlling mobility ratio before；Can judge that polymer flooding is in early days by the size of water-cut variation speed The optimal tuberculosis opportunity that note is poly-.
CN201610407102.4A 2016-06-08 2016-06-08 A kind of Offshore Heavy Oil Field oil reservoir early stage note gathers the determination method on preferable metaideophone opportunity Active CN106050196B (en)

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CN108915652A (en) * 2018-07-18 2018-11-30 西南石油大学 A kind of method of effective judgement polymer flooding fluidity control time range
CN110688779A (en) * 2019-10-17 2020-01-14 东北石油大学 Method for determining viscosity characteristic of oil-water emulsification system by considering phase separation behavior
CN111322054A (en) * 2018-12-17 2020-06-23 中国石油天然气股份有限公司 Three-three combined excavation and potential optimization mining method for sandstone oil reservoir in chemical flooding stage
CN112228055A (en) * 2020-11-10 2021-01-15 中国石油天然气股份有限公司 Method and device for determining conversion opportunity in two-three combined development mode
CN114136838A (en) * 2021-11-19 2022-03-04 中国海洋石油集团有限公司 Method for determining viscosity limit of water injection flooding crude oil at different water-containing stages of offshore heavy oil

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CN108915652A (en) * 2018-07-18 2018-11-30 西南石油大学 A kind of method of effective judgement polymer flooding fluidity control time range
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CN111322054A (en) * 2018-12-17 2020-06-23 中国石油天然气股份有限公司 Three-three combined excavation and potential optimization mining method for sandstone oil reservoir in chemical flooding stage
CN110688779A (en) * 2019-10-17 2020-01-14 东北石油大学 Method for determining viscosity characteristic of oil-water emulsification system by considering phase separation behavior
CN112228055A (en) * 2020-11-10 2021-01-15 中国石油天然气股份有限公司 Method and device for determining conversion opportunity in two-three combined development mode
CN112228055B (en) * 2020-11-10 2024-03-26 中国石油天然气股份有限公司 Method and device for determining conversion time under two-three combined development mode
CN114136838A (en) * 2021-11-19 2022-03-04 中国海洋石油集团有限公司 Method for determining viscosity limit of water injection flooding crude oil at different water-containing stages of offshore heavy oil
CN114136838B (en) * 2021-11-19 2023-11-17 中国海洋石油集团有限公司 Method for determining viscosity limit of crude oil driven by water injection at different water-containing stages of offshore thick oil

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