CN105317412A - Low-permeability oilfield energy-gathering equi-fluidity oil displacement method - Google Patents
Low-permeability oilfield energy-gathering equi-fluidity oil displacement method Download PDFInfo
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- CN105317412A CN105317412A CN201510630524.3A CN201510630524A CN105317412A CN 105317412 A CN105317412 A CN 105317412A CN 201510630524 A CN201510630524 A CN 201510630524A CN 105317412 A CN105317412 A CN 105317412A
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- molecular weight
- polyacrylamide
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Abstract
The invention discloses a low-permeability oilfield energy-gathering equi-fluidity oil displacement method and relates to the technical field of reservoir engineering. The method comprises the following steps: step I, counting and classifying permeabilities: classifying and counting the longitudinal permeabilities of an oil reservoir according to 10-50, 50-100, and greater than 100*10<-3> um<2>, and calculating the averaged permeability of each oil reservoir and the corresponding effective thickness; step II, selecting the molecular weight of polyacrylamide: according to the rule that k1, k2 and k3 are matched with the polyacrylamide P1, P2 and P3 with proper molecular weight respectively, wherein the molecular turning radius of polyacrylamide is smaller than 1/10 of the mid-value of a channel and can be measured by a BI-200 SM type wide angle dynamic/static light scatterometer system produced by BIC.
Description
Technical field
The present invention relates to reservoir engineering technical field, be specifically related to the mobility flooding methods such as a kind of low permeability oil field cumulative.
Background technology
Reservoir in low-permeability oilfields average pore is little, waterflooding extraction is supplementary stratum energy exploitation major way, affect by oil reservoir heterogeneous body, inject water and advance by leaps and bounds along high permeability zone, long-term injecting water easily forms advantage water stream channel, form water drive inefficient race way, cause swept volume to decline, recovery ratio reduces, and parallel technology of reservoir sweep [1] adopts same molecular weight polyacrylamide, realize the parallel displacement of reservoir oil by design variable concentrations combined slug, it is high that this flooding method drives method recovery ratio than conventional polymer.And for low-permeability oil deposit, adopt same polydispersity polymer to be just difficult to realize the parallel displacement of reservoir oil.Main cause is as follows: low permeability pay duct radius is little, and oil field common polymer is difficult to pass through.Low-permeability duct radius is less than 2000nm usually, and oil field is used for the polymer molecule turning radius of polymer flooding all at more than 200nm.In permeability 50 × 10
-3um
2on rock core, adopt Shanghai Hai Bo
type polymer solution carries out injection experiments, concentration 1000mg/L, and result all blocks, and its chemical agent turning radius is about 250nm after testing.Experiment is had to show, when duct radius is lower than polymer molecule turning radius 5 times, can block.Provide permeability and duct median radius relation, to 10 ~ 100 × 10
-3um
2permeable reservoir strata, duct median radius about 1000 ~ 2000nm.
Summary of the invention
The object of the invention is the weak point existed to overcome above-mentioned prior art, and providing the mobility flooding methods such as a kind of low permeability oil field cumulative, it is easy to use, simple to operate, be easy to large-scale promotion application.
The technical solution used in the present invention is: the mobility flooding methods such as a kind of low permeability oil field cumulative, comprise the following steps, step one, permeability statistical grade: by oil reservoir longitudinal permeability according to 10 ~ 50,50 ~ 100, >100 × 10
-3um
2hierarchical statistics, calculates reservoir mean permeability at different levels and corresponding effective thickness;
Step 2, selection Molecular Weight for Polyacrylamide: according to k1, k2, k3 mates suitable molecular weight polypropylene amine P1 respectively, P2, P3, polyacrylamide amine molecule turning radius should be less than duct intermediate value 1/10, and molecule turning radius can measure by/static light scattering instrument system dynamic with the civilian BI-200SM type wide-angle in U.S.'s Brooker sea;
Step 3, concentration of polyacrylamide select: concentration select in accordance with etc. mobility formula,
Wherein,
,
,
for corresponding P1, P2, P3 chemical agent viscosity, viscosimetric analysis Bu Shi rotary viscosity design determining;
Step 4, chemical flooding consumption: P1, P2, P3 molecular weight slug amount ratio is corresponding thickness h 1:h2:h3, and total consumption should at oil reservoir more than total pore volume 0.70PV;
Step 5, injection require: (1) P1, P2, P3 chemical agent slug can be divided into multiple round and inject;
(2) each wheel is secondaryly injected from P3, P2, P1 order, and P3 chemical agent slug low pressure is injected, P1 chemical agent slug high pressure injects, and P2 chemical agent slug injection pressure is placed in the middle, and between slug, injection pressure should be greater than 1MPa.
Described polyacrylamide amine molecule turning radius is directly proportional to molecular weight, considers that its molecule is linear structure, its molecular weight and molecule turning radius roughly linear.Molecular weight is lower, and tackifying ability is poorer, therefore, for cost-saving, is guaranteeing, on its basis that can pass through, should select the polyacrylamide that molecular weight is larger.
The invention has the beneficial effects as follows: the efficiency that can improve the displacement of reservoir oil greatly, can realize the oil displacement efficiency of multilayer, the efficiency of the displacement of reservoir oil is increased greatly, can be cost-saving, improve output.
Accompanying drawing illustrates:
Fig. 1 is hyposmosis of the present invention parallel displacement of reservoir oil laboratory experiment characteristic curve diagram.
Fig. 2 is the curve map of prior art of the present invention.
Detailed description of the invention:
The mobility flooding methods such as a kind of low permeability oil field cumulative, comprise the following steps, step one, permeability statistical grade: by oil reservoir longitudinal permeability according to 10 ~ 50,50 ~ 100, >100 × 10
-3um
2hierarchical statistics, calculates reservoir mean permeability at different levels and corresponding effective thickness;
Step 2, selection Molecular Weight for Polyacrylamide: according to k1, k2, k3 mates suitable molecular weight polypropylene amine P1 respectively, P2, P3, polyacrylamide amine molecule turning radius should be less than duct intermediate value 1/10, and molecule turning radius can measure by/static light scattering instrument system dynamic with the civilian BI-200SM type wide-angle in U.S.'s Brooker sea;
Step 3, concentration of polyacrylamide select: concentration select in accordance with etc. mobility formula,
Wherein,
,
,
for corresponding P1, P2, P3 chemical agent viscosity, viscosimetric analysis Bu Shi rotary viscosity design determining;
Step 4, chemical flooding consumption: P1, P2, P3 molecular weight slug amount ratio is corresponding thickness h 1:h2:h3, and total consumption should at oil reservoir more than total pore volume 0.70PV;
Step 5, injection require: (1) P1, P2, P3 chemical agent slug can be divided into multiple round and inject;
(2) each wheel is secondaryly injected from P3, P2, P1 order, and P3 chemical agent slug low pressure is injected, P1 chemical agent slug high pressure injects, and P2 chemical agent slug injection pressure is placed in the middle, and between slug, injection pressure should be greater than 1MPa.Described polyacrylamide amine molecule turning radius is directly proportional to molecular weight, considers that its molecule is linear structure, its molecular weight and molecule turning radius roughly linear.Molecular weight is lower, and tackifying ability is poorer, therefore, for cost-saving, is guaranteeing, on its basis that can pass through, should select the polyacrylamide that molecular weight is larger.
| Polypropylene amine molecular weight × 10 4 | 600 | 1000 | 1500 | 2500 |
| 1000mg/L viscosity (mpa.s) | 5.6 | 7.8 | 14.2 | 40 |
| Molecule turning radius (nm) | 55 | 90 | 140 | 230 |
Embodiment 1: artificial 3 layers of cuboid heterogeneous core, specification 4.5 × 4.5 × 30cm, basic, normal, high permeability is respectively 20, and 50,100 × 10
-3um
2.Choose 3 kinds of polypropylene amine chemical agents, molecular weight difference 200 × 10
4, 500 × 10
4, 1000 × 10
4, measure molecule turning radius and be followed successively by 32,70,110nm.Clear water preparation chemical agent uses solution, and chemical agent working concentration and viscosity are in table 3.
Table 3 chemical agent match condition table
Oil displacement experiment: conveniently core flooding test program, rock core vacuumizing saturation water, displacement saturated oils (viscosity 4mPa.s).
(1) water drive, water drive to moisture 98%, oil recovery factor 23.8%.
(2) chemical flooding: each chemical agent slug consumption, in table 4, injects from low to high according to molecular weight, finally again sequent water flooding to moisture 98%, controlled pressure in injection process.After displacement terminates, accumulative recovery ratio 47.9%, the relative water drive of chemical flooding increases recovery ratio 24.1% percentage point.
Displacement of reservoir oil tables of data
| Inject sequence number | Slug title | Consumption | Maximum pressure (MPa) |
| 1 | Water drive | 3.2PV | |
| 2 | 1000×10 4Molecular weight | 0.23PV | 0.55 |
| 3 | 600×10 4Molecular weight | 0.23PV | 0.80 |
| 4 | 200×10 4Molecular weight | 0.24PV | 0.86 |
| 5 | Sequent water flooding |
Claims (3)
1. the mobility flooding method such as low permeability oil field cumulative, is characterized in that: comprise the following steps,
Step one, permeability statistical grade: by oil reservoir longitudinal permeability according to 10 ~ 50,50 ~ 100, >100 × 10
-3um
2hierarchical statistics, calculates reservoir mean permeability at different levels and corresponding effective thickness;
Step 2, selection Molecular Weight for Polyacrylamide: according to k1, k2, k3 mates suitable molecular weight polypropylene amine P1 respectively, P2, P3, polyacrylamide amine molecule turning radius should be less than duct intermediate value 1/10, and molecule turning radius can measure by/static light scattering instrument system dynamic with the civilian BI-200SM type wide-angle in U.S.'s Brooker sea;
Step 3, concentration of polyacrylamide select: concentration select in accordance with etc. mobility formula,
Wherein,
,
,
for corresponding P1, P2, P3 chemical agent viscosity, viscosimetric analysis Bu Shi rotary viscosity design determining;
Step 4, chemical flooding consumption: P1, P2, P3 molecular weight slug amount ratio is corresponding thickness h 1:h2:h3, and total consumption should at oil reservoir more than total pore volume 0.70PV;
Step 5, injection require: (1) P1, P2, P3 chemical agent slug can be divided into multiple round and inject;
Each wheel is secondaryly injected from P3, P2, P1 order, and P3 chemical agent slug low pressure is injected, P1 chemical agent slug high pressure injects, and P2 chemical agent slug injection pressure is placed in the middle, and between slug, injection pressure should be greater than 1MPa.
2. the mobility flooding method such as low permeability oil field cumulative according to claim 1, it is characterized in that: described polyacrylamide amine molecule turning radius is directly proportional to molecular weight, consider that its molecule is linear structure, its molecular weight and molecule turning radius roughly linear.
3. molecular weight is lower, and tackifying ability is poorer, therefore, for cost-saving, is guaranteeing, on its basis that can pass through, should select the polyacrylamide that molecular weight is larger.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111734374A (en) * | 2020-08-01 | 2020-10-02 | 西南石油大学 | Associative polymer combination oil displacement method for greatly improving heterogeneous oil reservoir recovery ratio |
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2015
- 2015-09-29 CN CN201510630524.3A patent/CN105317412A/en active Pending
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| CN1828010A (en) * | 2006-03-06 | 2006-09-06 | 大庆油田有限责任公司 | Multi-block equal-fluidity energy-gathering parallel synchronous oil displacement method for heterogeneous oil reservoir |
| CA2648540A1 (en) * | 2008-01-11 | 2009-07-11 | Legacy Energy, Inc. | Combined miscible drive for heavy oil production |
| CN102619492A (en) * | 2012-02-23 | 2012-08-01 | 中国石油天然气股份有限公司 | Polymer flooding alternating injection method of heterogeneous oil reservoir |
| CN103321621A (en) * | 2013-06-24 | 2013-09-25 | 大庆大华宏业石油工程技术有限公司 | Heavy oil displacement method using wedged vicious slug |
| CN103939078A (en) * | 2014-03-27 | 2014-07-23 | 上海井拓石油开发技术有限公司 | Equal-fluidity fuel scavenge and fracturing integrated technology |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111734374A (en) * | 2020-08-01 | 2020-10-02 | 西南石油大学 | Associative polymer combination oil displacement method for greatly improving heterogeneous oil reservoir recovery ratio |
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Application publication date: 20160210 |