CN107725038B - Method for testing migration depth of plugging chemical profile control agent in oil reservoir - Google Patents
Method for testing migration depth of plugging chemical profile control agent in oil reservoir Download PDFInfo
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- 239000000126 substance Substances 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000013508 migration Methods 0.000 title claims abstract description 34
- 230000005012 migration Effects 0.000 title claims abstract description 34
- 238000012360 testing method Methods 0.000 title abstract description 11
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 53
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000011435 rock Substances 0.000 claims abstract description 37
- 238000002347 injection Methods 0.000 claims abstract description 19
- 239000007924 injection Substances 0.000 claims abstract description 19
- 239000008398 formation water Substances 0.000 claims abstract description 16
- 239000000243 solution Substances 0.000 claims abstract description 16
- 230000008569 process Effects 0.000 claims abstract description 8
- 230000001419 dependent effect Effects 0.000 claims description 4
- 230000033558 biomineral tissue development Effects 0.000 claims description 2
- 238000010998 test method Methods 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 2
- 238000013461 design Methods 0.000 abstract description 2
- 239000013043 chemical agent Substances 0.000 description 7
- 239000011148 porous material Substances 0.000 description 7
- 230000035699 permeability Effects 0.000 description 5
- 238000009530 blood pressure measurement Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 230000001965 increasing effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000005465 channeling Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000007429 general method Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 238000009738 saturating Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/10—Locating fluid leaks, intrusions or movements
- E21B47/117—Detecting leaks, e.g. from tubing, by pressure testing
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Abstract
The invention provides a method for testing migration depth of a plugging chemical profile control agent in an oil reservoir. The method comprises the following steps: vacuumizing the core to saturate formation water; performing first water drive on the rock core until the water drive pressure is stable, and recording the water drive pressure as initial stable pressure; preparing a plugging chemical profile control agent to be tested into a solution, and injecting the solution into the rock core until the injection pressure is stable; performing second water drive on the rock core until the water drive pressure is stable, and then respectively obtaining the pressure at each pressure measuring point on the rock core and the distance from each pressure measuring point to the injection end of the rock core; and constructing a functional relation between the pressure and the distance, and obtaining the migration depth of the plugging chemical profile control agent in the rock core according to the functional relation. The technical scheme provided by the invention can accurately judge the swept position of the chemical profile control agent, provides a corresponding basis for the design of a construction process, and fills the blank of the prior art in the aspect.
Description
Technical Field
The invention relates to a method for testing migration depth of a plugging chemical profile control agent in an oil reservoir, and belongs to the field of evaluation of the plugging chemical profile control agent.
Background
With the development of oil fields, the development difficulty of Chinese continental-phase oil fields is increased year by year, the water outlet of high-permeability oil layers is serious, and the production potential of low-permeability oil layers is difficult to exert. The long-term high-strength water injection causes a channeling channel to be formed in a high-permeability layer of the oil deposit, the injected water directly enters the production well along the channeling channel, an ineffective cycle is formed, the water content is increased, the yield is reduced, and the saturation of residual oil in a near-wellbore area is very low.
In view of the above, the currently widely adopted method is to develop chemical agents that can enter deep part of the reservoir and improve the flow direction of injected water to enlarge the deep part sweep efficiency of the reservoir, however, for those skilled in the art, it is important to test the migration depth of such chemical agents in the reservoir.
Therefore, it is an urgent technical problem in the art to provide a method capable of effectively testing the migration depth of the plugging chemical profile control agent in the oil reservoir.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a method for testing migration depth of a plugging chemical profile control agent in an oil reservoir, which can determine the seepage depth of the chemical profile control agent in a pore medium, so as to effectively evaluate the deep migration effect of the plugging chemical agent.
In order to achieve the above object, the present invention provides a method for testing migration depth of a plugging chemical profile control agent in an oil reservoir, which comprises the following steps:
vacuumizing the core to saturate formation water;
performing first water drive on the rock core until the water drive pressure is stable, and recording the water drive pressure as initial stable pressure;
preparing a plugging chemical profile control agent to be tested into a solution, and injecting the solution into the rock core until the injection pressure is stable; when the plugging chemical profile control agent to be tested is prepared into a solution, the concentration of the solution is not particularly limited, and the concentrations of solutions prepared by different profile control agents are different;
performing second water drive on the rock core until the water drive pressure is stable, and then respectively obtaining the pressure at each pressure measuring point on the rock core and the distance from each pressure measuring point to the injection end of the rock core;
and constructing a functional relation between the pressure and the distance, and obtaining the migration depth of the plugging chemical profile control agent in the rock core according to the functional relation.
At present, there is no specific method for calculating migration depth of profile control agent in oil reservoir, and the general method is as follows: after the profile control agent is injected, the pressure value of each pressure measuring point on the model is recorded, and when the pressure value of one point begins to rise, the profile control agent is considered to be transported to the position. The research of the invention finds that: the concentration of the chemical agent changes when the chemical agent seeps into the pore medium, namely, the concentration at the inlet is highest, the concentration gradually decreases along the flowing direction, the front concentration of the profile control agent approaches zero, and the point when the pressure increases is not the front of the migration of the profile control agent, namely, a certain point of pressure increase indicates that the profile control agent migrates to the position, but the certain concentration is already existed at the moment, and the front of the profile control agent may have migrated forward for a certain distance, so the general method adopts the pressure to judge the position, does not consider the concentration change of the profile control agent at all, and can not accurately obtain the position of the front.
In the technical scheme provided by the invention, the concentration of the plugging chemical profile control agent in the pore medium is gradually reduced along with forward continuous migration due to the adsorption and retention effects in the migration process, and the distance when the concentration is reduced to 0 is the migration distance of the chemical agent. Therefore, the first water flooding is performed before the plugging chemical profile control agent is injected, the corresponding pressure value is the pressure value when the water flooding pressure is stable, the pressure value is substituted into the constructed functional relation, the distance when the plugging chemical profile control agent concentration is zero can be obtained, and the distance is the migration distance of the plugging chemical profile control agent.
In the method, the number of pressure measurement points on the rock core can be determined according to actual conditions, and the pressure measurement points are ensured to be distributed at equal intervals. If the number of the pressure measuring points is n, the model is divided into n +1 sections, and the sections are equal in length.
In the above method, the permeability of the core is not particularly limited, and may be any permeability; preferably, the core is in the shape of a cube with dimensions of 4.5cm x 100cm, but is not limited thereto.
In the above method, preferably, when the second water flooding is performed, the method further includes a step of plotting a pressure change curve of each pressure measurement point on the core during the injection process.
In the above method, preferably, the water used in the water flooding is formation water; more preferably, the formation water has a degree of mineralization of 500ppm, but is not limited thereto.
In the above method, preferably, the constructing a functional relationship between the pressure and the distance includes the following processes: and performing regression fitting by taking the distance as an independent variable and the pressure as a dependent variable to obtain a functional relation between the pressure and the distance.
In the above method, preferably, obtaining the migration depth of the plugging chemical profile control agent in the core according to the functional relationship comprises the following processes: substituting the stable pressure (namely the pressure value when the water drive pressure is stable when the first water drive is carried out on the rock core) into the functional relation, and obtaining the migration depth of the plugging chemical profile control agent in the rock core. The larger the migration depth of the profile control agent is, the better the yield increasing effect of the secondary water flooding is.
The invention has the beneficial effects that:
the technical scheme provided by the invention can determine the front edge position of migration of the chemical profile control agent, so that the swept position of the chemical profile control agent can be accurately judged, a corresponding basis is provided for the design of a construction process, and the blank of the prior art in the aspect is filled.
Drawings
FIG. 1 is an experimental setup for testing migration depth of a plugging chemical profile control agent in a reservoir;
the main reference numbers illustrate:
1: an ISCO pump; 2: an intermediate container No. one; 3: a second intermediate container; 4: an inlet; 5: a core holder; 6: a back pressure valve; 7: an outlet; 8: an automatic collection instrument for produced liquid; 9: a thermostat; 10: automatic pressure acquisition system.
Detailed Description
The technical solutions of the present invention will be described in detail below in order to clearly understand the technical features, objects, and advantages of the present invention, but the present invention is not limited to the practical scope of the present invention.
The following examples can be operated by the existing reservoir migration depth experiment device for the plugging chemical agent (as shown in fig. 1), but are not limited thereto, and other devices capable of implementing the technical solution of the present invention are also possible. The apparatus shown in fig. 1 comprises: the device comprises an ISCO pump 1, a first intermediate container 2, a second intermediate container 3, an inlet 4, a rock core holder 5, a back pressure valve 6, an outlet 7, an automatic produced liquid collector 8, a constant temperature box 9 and an automatic pressure collecting system 10; wherein, the thermostated container 9 is arranged in to rock core holder 5, the one end of rock core holder 5 is equipped with entry 4, the other end is equipped with export 7, the one end of container 2 and No. two middle containers 3 links to each other with ISCO pump 1 respectively, their other end then links to each other with entry 4 respectively, export 7 department is equipped with back pressure valve 6, the extraction liquid automatic acquisition appearance 8 can automatic acquisition by the extraction liquid that export 7 flowed out, pressure automatic acquisition system 10 links to each other with rock core holder 5, it can the automatic pressure value of each pressure measurement point department of collection rock core, can splendid attire formation water in the container 2 in the middle of No. one, can splendid attire shutoff nature chemical profile control agent solution of preparing in the container 3 in the middle of No. two.
Example 1
This example provides a method to test the migration depth of a zwitterionic plugging chemical profile control agent in a 200mD reservoir. The method comprises the following steps:
1) a core 1 having a water permeability of 200md and having dimensions of 4.5X 100cm was prepared
2) The plugging chemical profile control agent to be tested (which is an amphoteric polymer gel manufactured by new petroleum technologies, beijing reid) was formulated into a solution at a concentration of 3000 ppm.
3) Carrying out first water flooding: and (3) vacuumizing the core for 8 hours at the temperature of 60 ℃, saturating formation water, obtaining the pore volume (the pore volume is 1PV) of the core after the core is completely saturated with the formation water, and continuously injecting the formation water until the pressure is stable (the pressure value is 0.02MPa, and the water phase permeability can be calculated according to the pressure value at the moment).
4) And injecting the prepared plugging chemical profile control agent solution into the rock core until the injection pressure is stable.
5) Performing second water drive: and (3) injecting formation water into the rock core until the injection pressure is stable, and at the moment, respectively recording the pressure value of each pressure measuring point on the rock core and the distance from each pressure measuring point to the injection end of the rock core.
6) Taking the distance as an independent variable, and taking the pressure value as a function relation between the pressure value and the distance of each point of the dependent variable regression:
lnP＝ln1.828+(-0.0653)L
wherein: p-pressure (MPa);
l-distance (cm) from the pressure measuring point to the core injection end.
7) Substituting a pressure value of 0.02MPa corresponding to the pressure reaching the stable state when the water flooding is carried out for the first time into the functional relation, wherein the calculated distance of 69.1cm is the distance when the concentration of the zwitterionic plugging chemical profile control agent is 0, namely the migration distance of the plugging chemical profile control agent;
according to the method, the migration distances of different zwitterionic plugging chemical profile control agents can be respectively tested,
example 2
This example provides a method to test the migration depth of inorganic plugging chemical profile agents in 5000mD reservoirs. The method comprises the following steps:
1) a core 1 having a water permeability of 5000md was prepared, and the core had dimensions of 4.5 × 4.5 × 30 cm.
2) A plugging chemical profile control agent to be tested (the chemical profile control agent is OMGL, manufactured by new petroleum technology company, beijing reid) was prepared into a solution at a concentration of 3000 ppm.
3) Carrying out first water flooding: and (3) vacuumizing the rock core for 8 hours at the temperature of 60 ℃, saturating formation water, obtaining the pore volume (the pore volume is 1PV) of the rock core after the rock core is completely saturated with the formation water, and continuously injecting the formation water until the pressure is stable.
4) And injecting the prepared inorganic plugging chemical profile control agent solution into the rock core until the injection pressure is stable.
5) Performing second water drive: and (3) starting a pump to inject formation water, driving until the injection pressure is stable, and recording the pressure value of each pressure measuring point of the rock core and the distance from each pressure measuring point to the injection end of the rock core after the injection pressure is stable.
6) Taking the distance as an independent variable, and taking the pressure value as a function relation between the pressure value and the distance of each point of the dependent variable regression:
P＝0.8501e-0.0707L
wherein: p is pressure (MPa)
And L is the distance (cm) from the pressure measuring point to the core injection end.
7) Substituting the pressure value of 0.02MPa when the pressure reaches the stable state in the first water drive into the function, and calculating to obtain the distance of 53cm, namely the distance of the inorganic plugging chemical profile control agent when the concentration is 0, namely the migration distance of the plugging chemical profile control agent.
Claims (6)
1. A method of testing the migration depth of a plugging chemical profile agent in a reservoir comprising the steps of:
vacuumizing the core to saturate formation water;
performing first water drive on the rock core until the water drive pressure is stable, and recording the water drive pressure as initial stable pressure;
preparing a plugging chemical profile control agent to be tested into a solution, and injecting the solution into the rock core until the injection pressure is stable;
performing second water drive on the rock core until the water drive pressure is stable, and then respectively obtaining the pressure at each pressure measuring point on the rock core and the distance from each pressure measuring point to the injection end of the rock core;
constructing a functional relation between the pressure and the distance, and obtaining the migration depth of the plugging chemical profile control agent in the rock core according to the functional relation;
wherein constructing a functional relationship between the pressure and the distance comprises the process of: taking the distance as an independent variable and the pressure as a dependent variable, and performing regression fitting to obtain a functional relation between the pressure and the distance;
obtaining the migration depth of the plugging chemical profile control agent in the core according to the functional relationship comprises the following processes: and substituting the initial stable pressure into the functional relation to obtain the migration depth of the plugging chemical profile control agent in the rock core.
2. The method as recited in claim 1, wherein the core has dimensions of 4.5cm x 100 cm.
3. The method of claim 1, wherein the water used in the waterflooding is formation water.
4. The method of claim 1 or 3, wherein the formation water has a degree of mineralization of 500 ppm.
5. The method of claim 1, wherein the chemical profile agent migration depth in a 200mD reservoir has a functional relationship of:
lnP=ln1.828+(-0.0653)L；
p is the pressure in MPa,
and L is the distance from the pressure measuring point to the core injection end, and the unit is cm.
6. The method of claim 1, wherein the chemical profile agent migration depth in a 5000mD reservoir has a functional relationship of:
P = 0.8501e-0.0707L
p is the pressure in MPa,
and L is the distance from the pressure measuring point to the core injection end, and the unit is cm.
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| US9945219B2 (en) * | 2010-10-04 | 2018-04-17 | Wintershall Holding GmbH | Process for producing mineral oil from underground mineral oil deposits |
| CN102797442B (en) * | 2011-05-27 | 2015-05-20 | 中国石油化工股份有限公司 | Deep fluid diversion method |
| CN103994959A (en) * | 2014-05-13 | 2014-08-20 | 中国石油天然气股份有限公司 | Method for evaluating oil reservoir adaptability of gel microsphere profile control agent |
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| CN105696988B (en) * | 2014-12-09 | 2019-02-22 | 中国海洋石油总公司 | The efficient Drainage process of combination flooding and its determining method under the conditions of industrialness well pattern |
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