CN104329082A - Method for determining high-permeability thick-oil oil reservoir polymer flooding early stage polymer injection transfer occasion - Google Patents
Method for determining high-permeability thick-oil oil reservoir polymer flooding early stage polymer injection transfer occasion Download PDFInfo
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- CN104329082A CN104329082A CN201410577565.6A CN201410577565A CN104329082A CN 104329082 A CN104329082 A CN 104329082A CN 201410577565 A CN201410577565 A CN 201410577565A CN 104329082 A CN104329082 A CN 104329082A
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- rock core
- water
- injection
- moisture content
- oil
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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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
-
- 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 a high-permeability thick-oil oil reservoir polymer flooding early stage polymer injection transfer occasion. The method comprises the following steps that (1) a rock core physical model is built according to a target high-permeability thick-oil oil reservoir, and in addition, injection water and simulated stratum oil are sequentially used for saturating the rock core physical model; (2) under the oil reservoir conditions, the rock core physical model is subjected to flood pot test, the rock core effluent liquid is collected, and a change curve between the water injection PV number and the rock core effluent liquid mass water content is obtained according to the relationship between the water injection PV number and the rock core effluent liquid mass water content; (3) a fast ascending stage of the rock core effluent liquid mass water content along with the water injection quantity in the change curve is determined, a function relationship formula between the rock core effluent liquid mass water content and the water injection PV number in the ascending stage is built, when the rock core effluent liquid mass water content is 0, and the obtained water injection PV number can be determined. The method has the advantages that simplicity and high speed are achieved, and the thick-oil oil reservoir polymer flooding transfer occasion can be more accurately obtained.
Description
Technical field
The present invention relates to and a kind ofly highly ooze the defining method that heavy crude reservoir polymer flooding notes poly-metaideophone opportunity in early days, belong to Petroleum Processing Technology field.
Background technology
The extensive popularization of current technique of polymer flooding, has applied to the exploitation of the marine oil reservoir in the Bohai Sea.Due to the aging effects by offshore platform, Speeding up development efficiency imperative (Zhang Xiansong, Sun Fu street, Feng Guozhi etc. testing in Bohai heavy oil fields research on influence factors of polymer flooding and field trial [J]. Chinese offshore oil and gas, 2007,19 (1): 30-34); Now current carried out polymer flooding notes poly-experimental study and the research of on-the-spot mining site all shows in early days, and note can not only improve recovery ratio poly-opportunity in advance, can also shorten the construction cycle, reduces injection rate.In the Bohai Sea, SZ36-1 mining site polymer flooding shifts to an earlier date in the test on metaideophone opportunity, relative under 95% High water cut condition, advance to moisture content 60% metaideophone, result of study shows recovery ratio amplification obviously (Wang Chao, Su Yanchun, Zhang Yingchun. offshore oilfield notes the poly-Researching and practicing [J] improving recovery ratio in early days. innovative technology, 2011,05:34-36).
For the polymer flooding exploitation of heavy crude reservoir, a relatively best note ought to be there is and gathered opportunity, and gather relative to High water cut metaideophone, recovery ratio amplification can be increased further, obtain optimal recovery ratio.Current scholar utilizes the Main Means of two dimension model experiment and method for numerical simulation, draw heavy crude reservoir polymer flooding oil reservoir moisture percentage be 0% or lower time metaideophone gather best results (Jiang Shanshan, Yang Junru, Sun Fu street etc. the research on opportunity of offshore oilfield polymer injection and on-the-spot application [J]. offshore oil, 2009,03 (29): 37-42); Shi Leiting etc. are by oozing the best metaideophone scope of theory analyzed and obtain polymer flooding under the SZ36-1 formation condition of the Bohai Sea mutually, and to think at oil reservoir port of export moisture content be about 0% is best note poly-opportunity by laboratory physical simulation experiment.
Existing research means and success be all to be based upon a large amount of physical model data and produced on-site real data basis on carry out, can not obtain related conclusions real-time, giving on-the-spotly actually provides guidance.So need one can fast and comparatively accurately method provide guidance for on-the-spot actual production.
Summary of the invention
The object of this invention is to provide and a kind ofly highly ooze the defining method that heavy crude reservoir polymer flooding notes poly-metaideophone opportunity in early days, the method can be simple and quick, comparatively accurately obtain the metaideophone opportunity of heavy crude reservoir polymer flooding, producing actual development for polymer flooding of heavy oil provides metaideophone to instruct, avoid obtaining metaideophone opportunity by the Physical Experiment of plenty of time and numerical simulation, affect the production development of oil reservoir.
Height provided by the invention oozes the defining method that heavy crude reservoir polymer flooding notes poly-metaideophone opportunity in early days, comprises the steps:
(1) rock core physical model is built according to the high heavy crude reservoir that oozes of target, and successively with injecting water and the saturated described rock core physical model of simulated formation oil;
(2) under reservoir conditions, flood pot test is carried out to described rock core physical model, and collects rock core efflux; According to the relation between the injection PV number of water and the quality moisture content of described rock core efflux, obtain the change curve between the injection PV number of water and the quality moisture content of described rock core efflux;
The volume that described injection PV number refers to the water injecting described rock core physical model accounts for the multiple of described rock core physical model total pore size volume, and unit is PV;
(3) determine in described change curve, the quality moisture content of described rock core efflux is with the quick ascent stage of water injection rate; Set up in described quick ascent stage, the functional relation between the quality moisture content of described rock core efflux and the injection PV number of water; According to described functional relation, when the quality moisture content of described rock core efflux is 0, obtain the injection PV number of water, be namely defined as height and ooze heavy crude reservoir polymer flooding and note poly-metaideophone opportunity in early days.
Above-mentioned defining method, in step (1), described injection water can be selected by the high heavy crude reservoir structure rock core physical model that oozes according to concrete target.
Above-mentioned defining method, in step (3), described change curve specifically can be divided into three phases, and the first stage is the anhydrous oil recovery stage, and the quality moisture content of described rock core efflux is 0%; Second stage is quick ascent stage, and the quality moisture content of described rock core efflux rises fast along with the injection PV number of water; Phase III is the stage that the change of the quality moisture content of described rock core efflux tends towards stability gradually.
Above-mentioned defining method, in step (3), described quick ascent stage slope can be 1.6 ~ 1.9PV-
1, described slope is the straight slope that described quick ascent stage holds line the whole story.
Above-mentioned defining method, in step (3), in described change curve, the quality moisture content that described quick ascent stage refers to described rock core efflux rises to the stage of 80% from 0.
Height provided by the invention oozes the defining method that heavy crude reservoir polymer flooding notes poly-metaideophone opportunity in early days, the method can be simple and quick, comparatively accurately obtain the metaideophone opportunity of heavy crude reservoir polymer flooding, producing actual development for polymer flooding of heavy oil provides metaideophone to instruct, avoid obtaining metaideophone opportunity by the Physical Experiment of plenty of time and numerical simulation, affect the production development of oil reservoir.
Accompanying drawing explanation
Fig. 1 is the change curve between the injection PV number of water in the specific embodiment of the invention and the quality moisture content of rock core efflux.
Fig. 2 is 3 different phases in Fig. 1 change curve.
Fig. 3 is the quick ascent stage of quality moisture content with water injection rate of rock core efflux in Fig. 2.
Fig. 4 is quick ascent stage, the change curve of the quality moisture content of rock core efflux and the injection PV number of water and matched curve.
Detailed description of the invention
The experimental technique used in following embodiment if no special instructions, is conventional method.
Material used in following embodiment, reagent etc., if no special instructions, all can obtain from commercial channels.
Carried out the research of indoor Physical Experiment by the inventive method, comprise the steps:
(1) first make physical model for the oil reservoir of specified conditions, be three layers of heterogeneous body in Table 1:(45mm × 45mm × 300mm, the coefficient of variation is 0.76, and mean permeability is 2500mD).
Table 1 oil displacement experiment related data
| Parameter type | Parameter value |
| Viscosity of crude, mPas | 70 |
| Temperature, DEG C | 65 |
| Physical model | 45×45×300 |
| Permeability, mD | 2500 |
| Viscosity of injected water, mPas | 0.6 |
(2) vacuum saturation water (above-mentioned physical model rock core is put into and injects water, to find time 12h with vacuum pump negative pressure 0.1MPa) condition; Under temperature 75 DEG C of conditions unsteady flow speed with 0.1,0.2,0.5,1mL/min flow velocity displacement 16h respectively, 4h, 4h, the mode saturated oils of 2h, after aging 48h, carry out physical simulation experiment flood pot test, obtain the change curve between the injection PV number of water in the water drive oil process under condition shown in table 1 and the quality moisture content of rock core efflux, see Fig. 1.
(3) as shown in Figure 2, the curve of Fig. 1 is divided into three sections, moisture content is the section (without water drive oil section) of 0, and (slope is 1.6-1.9PV to the section of moisture content 0-80%
-1) (moisture content quick ascent stage), and moisture content 80%-95% (moisture content rising steady section).Get the moisture content quick ascent stage, namely moisture content is that this one-phase curve of 0-80% generates Fig. 3.
(4) the quick ascent stage according to Fig. 3, the quality moisture content of rock core efflux, with the change curve of the injection PV number of water, obtains the change curve of injection PV number with the quality moisture content of rock core efflux of water, as shown in Figure 4.
According to the injection PV number of the above-mentioned water change curve with the quality moisture content of rock core efflux, matching obtains the functional relation between the quality moisture content of rock core efflux and the injection PV number of water: y=5 × 10
-7x
3+ 1 × 10
-5x
2+ 0.000x+0.130, R
2=0.996, the change curve between the two of this functional relation reflection as shown in Figure 4.
(5) by the functional relation of the quick ascent stage of moisture content, and in conjunction with the anhydrous oil recovery section of oil reservoir, the anti-reservoir water drive that is pushed into breaks through section, when water drive oil namely during x=0 breaks through oil reservoir, metaideophone gathers, obtaining current water injection rate is 0.130PV, is namely defined as best metaideophone and gathers opportunity.
In above-mentioned experimentation, measure the oil recovery factor under different injection amount, result is as shown in table 2.As shown in Table 2, when reservoir water drive leading edge is about to reach the port of export, namely when water injection rate is 0.122PV (moisture content is 0), the ultimate recovery of crude oil reaches 49.2%, recovery ratio value is the highest, the water injection rate obtained with confirmation method of the present invention is that 0.130PV (moisture content is 0%) is close, demonstrates feasibility and the credibility of the inventive method.
Table 2 is the poly-Opportunity Analysis result of the poly-different note of note in early days
| Note gathers opportunity | Ultimate recovery, % |
| Water filling 0.003PV (moisture content 0%) | 44.5 |
| Water filling 0.104PV (moisture content 0%) | 48.3 |
| Water filling 0.122PV (moisture content 0%) | 49.2 |
| Water filling 0.131PV (moisture about 20%) | 44.9 |
Claims (3)
1. highly ooze the defining method that heavy crude reservoir polymer flooding notes poly-metaideophone opportunity in early days, comprise the steps:
(1) rock core physical model is built according to the high heavy crude reservoir that oozes of target, and successively with injecting water and the saturated described rock core physical model of simulated formation oil;
(2) under reservoir conditions, flood pot test is carried out to described rock core physical model, and collects rock core efflux; According to the relation between the injection PV number of water and the quality moisture content of described rock core efflux, obtain the change curve between the injection PV number of water and the quality moisture content of described rock core efflux;
The volume that described injection PV number refers to the water injecting described rock core physical model accounts for the multiple of described rock core physical model total pore size volume, and unit is PV;
(3) determine in described change curve, the quality moisture content of described rock core efflux is with the quick ascent stage of water injection rate; Set up in described quick ascent stage, the functional relation between the quality moisture content of described rock core efflux and the injection PV number of water; According to described functional relation, when the quality moisture content of described rock core efflux is 0, obtain the injection PV number of water, be namely defined as height and ooze heavy crude reservoir polymer flooding and note poly-metaideophone opportunity in early days.
2. defining method according to claim 1, is characterized in that: in step (3), in described change curve, and the slope of described quick ascent stage is 1.6 ~ 1.9PV
-1.
3. defining method according to claim 2, is characterized in that: in step (3), in described change curve, and the quality moisture content that described quick ascent stage refers to described rock core efflux rises to the stage of 80% from 0.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105863587A (en) * | 2016-06-01 | 2016-08-17 | 中国海洋石油总公司 | Method for determining alternating injection time of polymer flooding |
| CN106014359A (en) * | 2016-06-08 | 2016-10-12 | 西南石油大学 | Method for judging earliest injection transfer opportunity of early-stage polymer injection of offshore oil deposit |
| CN106050196A (en) * | 2016-06-08 | 2016-10-26 | 西南石油大学 | Method for determining good transfer-injection opportunity for early polymer injection of offshore heavy oil reservoir |
| CN106097118A (en) * | 2016-06-08 | 2016-11-09 | 西南石油大学 | A kind of permeability saturation curve determines the method for heavy crude reservoir polymer flooding scope on opportunity |
| CN107869340A (en) * | 2016-09-23 | 2018-04-03 | 中国石油化工股份有限公司 | The system of selection on thick oil well bore viscosity reduction opportunity |
| CN111502616A (en) * | 2019-01-30 | 2020-08-07 | 中国石油天然气股份有限公司 | Method and device for determining water injection parameters and storage medium |
| 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 |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105863587A (en) * | 2016-06-01 | 2016-08-17 | 中国海洋石油总公司 | Method for determining alternating injection time of polymer flooding |
| CN105863587B (en) * | 2016-06-01 | 2018-10-16 | 中国海洋石油集团有限公司 | A kind of determination method of polymer flooding alternating injection timing |
| CN106014359A (en) * | 2016-06-08 | 2016-10-12 | 西南石油大学 | Method for judging earliest injection transfer opportunity of early-stage polymer injection of offshore oil deposit |
| CN106050196A (en) * | 2016-06-08 | 2016-10-26 | 西南石油大学 | Method for determining good transfer-injection opportunity for early polymer injection of offshore heavy oil reservoir |
| CN106097118A (en) * | 2016-06-08 | 2016-11-09 | 西南石油大学 | A kind of permeability saturation curve determines the method for heavy crude reservoir polymer flooding scope on opportunity |
| CN106050196B (en) * | 2016-06-08 | 2019-03-08 | 西南石油大学 | A kind of Offshore Heavy Oil Field oil reservoir early stage note gathers the determination method on preferable metaideophone opportunity |
| CN107869340A (en) * | 2016-09-23 | 2018-04-03 | 中国石油化工股份有限公司 | The system of selection on thick oil well bore viscosity reduction opportunity |
| CN111502616A (en) * | 2019-01-30 | 2020-08-07 | 中国石油天然气股份有限公司 | Method and device for determining water injection parameters and storage medium |
| 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 |
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Address after: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Co-patentee after: CNOOC research institute limited liability company Patentee after: China Offshore Oil Group Co., Ltd. Address before: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Co-patentee before: CNOOC Research Institute Patentee before: China National Offshore Oil Corporation |
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