CN104331590A - Quick evaluation method for well injection chemical agent injectivity of low-permeability oil field - Google Patents
Quick evaluation method for well injection chemical agent injectivity of low-permeability oil field Download PDFInfo
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- CN104331590A CN104331590A CN201410374596.1A CN201410374596A CN104331590A CN 104331590 A CN104331590 A CN 104331590A CN 201410374596 A CN201410374596 A CN 201410374596A CN 104331590 A CN104331590 A CN 104331590A
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Abstract
The invention discloses a quick evaluation method for the well injection chemical agent injectivity of a low-permeability oil field. The quick evaluation method comprises the following steps: 1) filtering chemical agent to be injected into a well by adopting a filter membrane of which the aperture is 0.45[mu] m to obtain filtrate; and 2) calculating a mass ratio of the obtained filtrate and the chemical agent which is not filtered, and if the mass ratio of the obtained filtrate and the chemical agent which is not filtered is greater than or equal to 99.5%, evaluating that the chemical agent to be injected into the well exhibits good injectivity without blocking a reservoir. The injectivity of the chemical agent is evaluated according to the mass ratio (through rate) of the filtrate and the chemical agent which is not filtered, an evaluation result is accurate, and a reliable basis is provided for the field injectivity operation of the low-permeability oil field. The invention is quick and simple in operation, and a process of forming a report from preparing an experiment can be finished within one hour; a complex physical simulation experiment is omitted, required experiment equipment is simple, manpower and material resources are greatly saved, experiment cost is low, and the invention is suitable for popularizing and applying.
Description
Technical field
The invention belongs to technical field of oilfield chemistry, be specifically related to a kind of low-permeability oilfield and enter well chemical agent injection fast appraisement method.
Background technology
In low-permeability oilfield Development Practice process, because of benefit exploitation or the needs of scientific research, usually inject chemical agent, when evaluating the injection of certain or several chemical agent compound system, the natural core of the corresponding oil reservoir of normal employing and the chemical agent of pre-implant, carry out more complicated physical simulation experiment (also claiming rock core flowing experiment), evaluate its injection.Though the method generally accepts for everybody and uses, time-consuming (about 1 month) requires great effort, quick and easy not.
Summary of the invention
The object of this invention is to provide a kind of low-permeability oilfield and enter well chemical agent injection fast appraisement method.
In order to realize above object, the technical solution adopted in the present invention is: a kind of low-permeability oilfield enters well chemical agent injection fast appraisement method, comprises the following steps:
1) get the chemical agent of pre-implant well, filter with the filter membrane that aperture is 0.45 μm, obtain filtrate;
2) calculate the mass ratio of gained filtrate and the front chemical agent of filter, if mass ratio >=99.5% of gained filtrate and the front chemical agent of filter, then the chemical agent injection evaluating this pre-implant well is good, can not block reservoir.
Described chemical agent is surfactant solution.
The mass concentration of described surfactant solution is 0.3%.Solvent is water.
Step 1) in get chemical agent quality be 100 ~ 800g.Preferably, step 1) in get chemical agent quality be 200 ~ 500g.
Step 1) described in filter be filter under the pressure of 0.2MPa.
Described filter membrane soaks with the chemical agent of pre-implant well before filtration.The amount of soaking chemical agent used is not counted in the quality of the front chemical agent of filter.If nonwetting, during filtration, filter membrane can absorption portion filtrate make it soak, thus makes experimental result produce comparatively big error; Before filtering, filter membrane is soaked, can effectively reduce or avoid this error.
Low-permeability oilfield of the present invention enters in well chemical agent injection fast appraisement method, and the aperture of filter membrane is 0.45 μm, and these data are according to low-permeability oilfield pore throat characteristic, and with reference to petroclastic rock injection water quality standard and a large amount of actual tests gained.Before calculating gained filtrate and filter chemical agent quality than time, degree of accuracy is 0.1%.
Low-permeability oilfield of the present invention enters in well chemical agent injection fast appraisement method, and temperature can be normal temperature, low temperature or high temperature, and actual temp can simulate the temperature of rock stratum, oil field under corresponding operating mode of chemical agent to be implanted.
Low-permeability oilfield of the present invention enters well chemical agent injection fast appraisement method, by the membrane filtration that the chemical agent aperture of pre-implant well is 0.45 μm, mass ratio (i.e. percent of pass) according to the front chemical agent of filtrate and filter carrys out the injection of evaluating chemical agent, evaluation result is accurate, for the on-the-spot injection operation of low-permeability oilfield provides reliable foundation; Simple and efficient to handle, from Preparatory work of experiment to formation report, can complete in 1 hour; Do not need to carry out complicated physical simulation experiment, required experimental facilities is simple, and dramatically saves on man power and material, experimental cost is low, is applicable to applying.
Embodiment
Below in conjunction with embodiment, the present invention is further illustrated.
In embodiment, JA type surfactant used is a kind of double ion surfactant, is commercial goods, purchased from the million days Chemical Co., Ltd.s in Shaanxi; Nova used No. II (compound) surfactant is commercial goods, purchased from Hefei Xinxing Oilfield Chemistry Medicament Co., Ltd.; Aperture used is the filter membrane of 0.45 μm is experiment 0.45 μm of filter membrane, and material and specification are unified.
Embodiment 1
The low-permeability oilfield of the present embodiment enters well chemical agent injection fast appraisement method, evaluates, comprise the following steps: the injection of the pre-implant Heat supply pipeline here JA type surfactant solution (mass concentration 0.3%) of 2 blocks
1) the JA type surfactant solution 378.8g of pre-implant well is got, for subsequent use;
2) getting 1 aperture is that the filter membrane of 0.45 μm soaks (quality that the amount of soaking chemical agent used is not counted in chemical agent before filter) in JA type surfactant solution, and installs in the filter, closedown filtrator lower switches;
3) pour JA type surfactant solution into filtrator tank body, enclosed filters top cover also maintains its top displacement pressure 0.2MPa, and opened filter lower switches, filters, and collects filtrate, and the quality weighing filtrate is 376.9g;
4) calculating gained filtrate with the mass ratio of the front chemical agent of filter is that 376.9/378.8=99.5%, namely percent of pass is 99.5%, and the chemical agent injection evaluating this pre-implant well is good, and injection process can not block reservoir.
Embodiment 2
The low-permeability oilfield of the present embodiment enters well chemical agent injection fast appraisement method, evaluates, comprise the following steps: the injection of the pre-implant Heat supply pipeline here JA type surfactant solution (mass concentration 0.3%) of 2 blocks
1) the molten 328.5g of JA type surfactant of pre-implant well is got, for subsequent use;
2) getting 1 aperture is that the filter membrane of 0.45 μm soaks (quality that the amount of soaking chemical agent used is not counted in chemical agent before filter) in JA type surfactant solution, and installs in the filter, closedown filtrator lower switches;
3) pour JA type surfactant solution into filtrator tank body, enclosed filters top cover also maintains its top displacement pressure 0.2MPa, and opened filter lower switches, filters, and collects filtrate, and the quality weighing filtrate is 327.5g;
4) calculating gained filtrate with the mass ratio of the front chemical agent of filter is that 327.5/328.5=99.7%, namely percent of pass is 99.7%>99.5%, and the chemical agent injection evaluating this pre-implant well is good, and injection process can not block reservoir.
Embodiment 3
The low-permeability oilfield of the present embodiment enters well chemical agent injection fast appraisement method, evaluates, comprise the following steps: the injection of the pre-implant Heat supply pipeline here JA type surfactant solution (mass concentration 0.3%) of 2 blocks
1) the JA type surfactant solution 428.7g of pre-implant well is got, for subsequent use;
2) getting 1 aperture is that the filter membrane of 0.45 μm soaks (quality that the amount of soaking chemical agent used is not counted in chemical agent before filter) in JA type surfactant solution, and installs in the filter, closedown filtrator lower switches;
3) pour JA type surfactant solution into filtrator tank body, enclosed filters top cover also maintains its top displacement pressure 0.2MPa, and opened filter lower switches, filters, and collects filtrate, and the quality weighing filtrate is 426.6g;
4) calculating gained filtrate with the mass ratio of the front chemical agent of filter is that 426.6/428.7=99.5%, namely percent of pass is 99.5%, and the chemical agent injection evaluating this pre-implant well is good, and injection process can not block reservoir.
Embodiment 4
The low-permeability oilfield of the present embodiment enters well chemical agent injection fast appraisement method, the injection of nova No. II (compound) surfactant solution (mass concentration 0.3%) of pre-implant Ben Butu oil map 1 well is evaluated, comprises the following steps:
1) nova No. II (compound) surfactant solution 232.8g of pre-implant is got, for subsequent use;
2) getting 1 aperture is that the filter membrane of 0.45 μm soaks (quality that the amount of soaking chemical agent used is not counted in chemical agent before filter) in nova No. II (compound) surfactant solution, and install in the filter, close filtrator lower switches;
3) nova No. II (compound) surfactant solution is poured into filtrator tank body, enclosed filters top cover also maintains its top displacement pressure 0.2MPa, and opened filter lower switches, filters, collect filtrate, the quality weighing filtrate is 211.9g;
4) calculating gained filtrate with the mass ratio of the front chemical agent of filter is that 211.9/232.8=91.0%, namely percent of pass is 91.0%<99.5%, and the chemical agent injection evaluating this pre-implant well is poor, and injection process may block reservoir.
In actual application afterwards, really near Fig. 1 well " borehole ", define certain blocking, have impact on the normal injection of this surfactant.
Experimental example
The low-permeability oilfield of this experimental example to embodiment 1-4 enters well chemical agent injection fast appraisement method and rock core flowing experiment (comparative example 1,2) compares, and result is as shown in table 1,2.
Wherein, the technical parameter of the rock core flowing experiment of comparative example 1 and 2 is as shown in table 1.
The concrete operations flow process of comparative example 1 and comparative example 2 is: 1. Preparatory work of experiment: drill through and prepare rock core, Experimental Flowing Object preparation, flow process preparation, rock core oil washing etc., needs about 15 days; 2. the rock core that washing oil is complete needs airing 3 ~ 5 days (benzene volatilization process), can use; 3. rock core is dried needs 2 days; 4. rock core is found time saturated 2 days, makes irreducible water 7 days, and 5. surfactant displacement is tested 1 day (laboratory report time-out), counts 32 days.
The technical parameter of the rock core flowing experiment of table 1 comparative example 1 and comparative example 2
The fast appraisement method of table 2 embodiment 1-4 and rock core flowing experiment comparative result
As can be seen from table 1,2, embodiment 1-4 low-permeability oilfield to enter well chemical agent injection fast appraisement method consistent with the result height of rock core flowing experiment for the chemical agent biological injection evaluation result of pre-implant well, but rock core flowing experiment wastes time and energy; It is extremely short, convenient and swift that low-permeability oilfield of the present invention enters well chemical agent injection fast appraisement method required time, saves man power and material greatly.
Claims (5)
1. low-permeability oilfield enters a well chemical agent injection fast appraisement method, it is characterized in that: comprise the following steps:
1) get the chemical agent of pre-implant well, filter with the filter membrane that aperture is 0.45 μm, obtain filtrate;
2) calculate the mass ratio of gained filtrate and the front chemical agent of filter, if mass ratio >=99.5% of gained filtrate and the front chemical agent of filter, then the chemical agent injection evaluating this pre-implant well is good, can not block reservoir.
2. low-permeability oilfield according to claim 1 enters well chemical agent injection fast appraisement method, it is characterized in that: described chemical agent is surfactant solution.
3. low-permeability oilfield according to claim 1 and 2 enters well chemical agent injection fast appraisement method, it is characterized in that: step 1) in get chemical agent quality be 100 ~ 800g.
4. low-permeability oilfield according to claim 1 enters well chemical agent injection fast appraisement method, it is characterized in that: step 1) described in filter be filter under the pressure of 0.2MPa.
5. the low-permeability oilfield according to claim 1 or 4 enters well chemical agent injection fast appraisement method, it is characterized in that: described filter membrane soaks with the chemical agent of pre-implant well before filtration.
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| CN201410374596.1A CN104331590A (en) | 2014-07-31 | 2014-07-31 | Quick evaluation method for well injection chemical agent injectivity of low-permeability oil field |
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Citations (3)
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| CN103510933A (en) * | 2013-09-27 | 2014-01-15 | 中国石油天然气股份有限公司 | Quantitative evaluation method for imbibition oil production effect of imbibition agent |
| CN103698484A (en) * | 2013-12-26 | 2014-04-02 | 中国海洋石油总公司 | Method for evaluating foam regenerating capability |
| CN103940715A (en) * | 2013-01-22 | 2014-07-23 | 中国石油化工股份有限公司 | Simulating experiment method of rock natural seepage ability |
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Patent Citations (3)
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| CN103940715A (en) * | 2013-01-22 | 2014-07-23 | 中国石油化工股份有限公司 | Simulating experiment method of rock natural seepage ability |
| CN103510933A (en) * | 2013-09-27 | 2014-01-15 | 中国石油天然气股份有限公司 | Quantitative evaluation method for imbibition oil production effect of imbibition agent |
| CN103698484A (en) * | 2013-12-26 | 2014-04-02 | 中国海洋石油总公司 | Method for evaluating foam regenerating capability |
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| 张志英 等: "聚合物注入能力的实验研究", 《实验力学》 * |
| 张立娟 等: "大庆中低渗油层聚合物溶液注入性和驱油性能分析", 《油田化学》 * |
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Application publication date: 20150204 |