CN110454126B - Imbibition agent evaluation experimental device and method for imbibition oil production - Google Patents
Imbibition agent evaluation experimental device and method for imbibition oil production Download PDFInfo
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- 238000005213 imbibition Methods 0.000 title claims abstract description 137
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000011156 evaluation Methods 0.000 title claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 238000007789 sealing Methods 0.000 claims abstract description 39
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 239000003921 oil Substances 0.000 claims description 103
- 238000001764 infiltration Methods 0.000 claims description 79
- 230000008595 infiltration Effects 0.000 claims description 78
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 54
- 239000003795 chemical substances by application Substances 0.000 claims description 38
- 238000002474 experimental method Methods 0.000 claims description 28
- 239000010779 crude oil Substances 0.000 claims description 26
- 230000035699 permeability Effects 0.000 claims description 25
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 23
- 239000011780 sodium chloride Substances 0.000 claims description 20
- 238000011084 recovery Methods 0.000 claims description 15
- 239000011148 porous material Substances 0.000 claims description 10
- 238000005303 weighing Methods 0.000 claims description 9
- 230000032683 aging Effects 0.000 claims description 6
- 239000007769 metal material Substances 0.000 claims description 6
- 229920006395 saturated elastomer Polymers 0.000 claims description 6
- 238000006073 displacement reaction Methods 0.000 claims description 5
- 239000006004 Quartz sand Substances 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical group O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 239000012267 brine Substances 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims description 2
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 2
- 230000001502 supplementing effect Effects 0.000 claims description 2
- 239000010902 straw Substances 0.000 claims 2
- 238000010521 absorption reaction Methods 0.000 claims 1
- 230000008676 import Effects 0.000 claims 1
- 238000012216 screening Methods 0.000 abstract description 15
- 238000011160 research Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 description 16
- 239000011435 rock Substances 0.000 description 15
- 238000000605 extraction Methods 0.000 description 7
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 230000000007 visual effect Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
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- 238000005119 centrifugation Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
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- 230000004048 modification Effects 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
- 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
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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
- 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
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Abstract
The invention discloses an imbibition agent evaluation experimental device and method for imbibition oil production, the device comprises an imbibition bottle and an imbibition pipe, the top end of the imbibition bottle is provided with a scale pipe, the lower part of a bottle body of the imbibition bottle is provided with an inlet, the imbibition pipe comprises a hollow pipe body, a plug for sealing two ends of the pipe body and a porous gasket arranged in the pipe body, the diameter of the porous gasket is the same as the inner diameter of the pipe body, the plug comprises a cover plate and a boss fixed on the cover plate, the cover plate is provided with a fastening bolt hole and an oil outlet, the oil outlet is communicated with an oil outlet channel, the oil outlet channel is arranged in the plug, the boss is plugged in the pipe body, and the outer diameter of the boss is the same as the inner diameter of the pipe body. The invention provides the imbibition agent evaluation experimental device and the method which are low in cost, easy to operate, capable of heating, good in repeatability, short in experimental period and visible, and provides a platform for imbibition agent screening evaluation and imbibition oil production rule research.
Description
Technical Field
The invention relates to the technical field of imbibition oil production, in particular to an experimental device and method for evaluating an imbibition agent for imbibition oil production.
Background
In recent years, as the demand for oil and gas resources is continuously increased worldwide, low-permeability dense oil and gas resources become an indispensable important component in the global energy structure, and the position is gradually highlighted. China has abundant low-permeability reserves, is distributed in various oil zones of China, and has over 50 hundred million tons of geological reserves, wherein the sandstone oil field accounts for 70 percent, and other special lithologic oil fields account for 30 percent. Compared with the conventional oil reservoir, the low-permeability compact oil reservoir has small porosity and low permeability, and the conventional water injection development is difficult to obtain better effect, and the imbibition oil recovery is one of the main development technologies of the low-permeability oil reservoir. The displacement action of the wetting phase relative to the non-wetting phase generated by the action of capillary force in the porous medium is called imbibition, and since the pore throat of a low-permeability reservoir is fine, the capillary force is high, and the spontaneous imbibition action is an important oil extraction mechanism.
The imbibition agent is a chemical agent for imbibition oil recovery, and comprises a plurality of types, and at present, the specific index of the imbibition agent and the system thereof can influence the imbibition oil recovery effect better and is not known uniformly. Therefore, the students still continuously and deeply research and explore the factors and rules influencing the imbibition effect, and the generally examined indexes comprise wettability reversal capacity, contact angle change, oil sand imbibition efficiency, core imbibition efficiency and the like.
Core experiments are typically performed in screening and evaluating imbibition agents, but are not suitable for evaluating and screening imbibition agents in terms of time spent because core experiments require 2 to 3 months or more from the whole cycle of basic data testing, saturated oil, to aging and imbibition experiments.
Meanwhile, the research method of the existing imbibition experimental device mainly comprises a volume method and a mass method, wherein the volume method is to calculate the liquid displacement amount between a solution and a rock core by measuring the volume of crude oil or an imbibition system solution, and calculate the extraction degree by recording the change of the imbibition oil extraction amount along with time, so as to evaluate the oil displacement effect, and the weighing method is to calculate the imbibition result by measuring the weight change condition of the rock core or the imbibition system solution. The volume method is used for imbibition with larger core pore volume, the imbibition result can be well observed, the electronic automatic weighing precision of the weighing method is higher, and the change of weight can be recorded at any time.
However, in the prior art, the core is adopted to perform the experiment, the core is expensive, the time period is long, the repeatability is poor, and after the experiment is completed, it is difficult to see the imbibition effect inside the core, so the prior art adopting the core to perform the experiment is not suitable for the screening of the imbibition agent and the research of the imbibition oil extraction law.
And the experimental conditions of the existing imbibition experimental device are mostly normal temperature and normal pressure, and the imbibition effect of stratum matrix rock under the condition of certain temperature cannot be better simulated, so that the measurement result of the imbibition instrument under normal temperature and normal pressure has certain difference with the real stratum condition. The existing high-temperature high-pressure imbibition oil extraction device has harsh experimental conditions, long experimental period and complex experimental operation.
Aiming at the defects of the existing experimental device, it is necessary to explore a visual imbibition experimental device which has the advantages of low cost, easy operation, heating, good repeatability and short experimental period, and provides a platform for the imbibition agent screening and the imbibition oil production law research.
Disclosure of Invention
In view of the above, aiming at the defects of the prior art, the invention provides a visual imbibition agent evaluation experimental device and method which are low in cost, easy to operate, capable of heating, good in repeatability, short in experimental period and capable of providing a platform for imbibition agent screening evaluation and imbibition oil production law research.
In order to solve the technical problems, the technical scheme of the invention firstly provides an imbibition agent evaluation experimental device for imbibition oil production, which comprises an imbibition bottle and an imbibition pipe, wherein the top end of the imbibition bottle is provided with a scale pipe, an inlet is formed below a bottle body of the imbibition bottle, the imbibition pipe comprises a hollow pipe body, end caps for sealing two ends of the pipe body and a porous gasket arranged in the pipe body, the diameter of the porous gasket is the same as the inner diameter of the pipe body, each end cap comprises a cover plate and a boss fixed on the cover plate, a fastening bolt hole and an oil outlet are formed in the cover plate, the oil outlet is communicated with an oil outlet channel, the oil outlet channel is arranged in the end caps, the boss is plugged in the pipe body, and the outer diameter of the boss is the same.
Furthermore, the infiltration bottle is made of a temperature-resistant pressure-resistant transparent non-metallic material; the body of infiltration pipe adopts the transparent non-metallic material preparation of temperature resistant withstand voltage, specifically is temperature resistant withstand voltage's glass material, makes things convenient for the observation of infiltration suction experiment effect and bears the experimental temperature of target oil reservoir, makes the experiment more be close to target oil reservoir condition, and the experimental result is more reliable.
Furthermore, the surfaces of the infiltration and suction bottle and the infiltration and suction pipe are provided with oil-dredging layers. This oleophobic layer set up to prior art, can realize through adding oleophobic ingredient in the preparation material, and the accuracy of experimental result can further be improved in the setting up of oleophobic layer.
Furthermore, the bottle body inlet of the infiltration suction bottle is sealed by adopting a thread sealing cover, and the sealing mode has the advantages of simple manufacture, simple and convenient operation and reliable sealing.
Furthermore, the number of the fastening bolt holes is three, the center of the cover plate is used as the center of the circle, the angles are equal, and the sealing and fixing of the plugs at the two ends are guaranteed.
Furthermore, a sealing ring is arranged on the boss, and a sealing ring is sleeved on the sealing ring. More preferably, more than two sealing ring rings are arranged on the boss. The arrangement can further enhance the sealing performance of the two ends of the seepage pipe body.
Meanwhile, the invention also provides an experimental method for evaluating the imbibition agent for imbibition oil production by adopting the experimental device, which specifically comprises the following steps:
(1) installing a porous gasket and a plug at one end of the infiltration suction pipe, filling a porous medium with a certain particle size to a scale mark from the other end of the infiltration suction pipe, placing the infiltration suction pipe into a centrifuge, centrifuging for 20min at a centrifugation speed of 3600r/min, supplementing the porous medium into the infiltration suction pipe again to the scale mark, installing the porous gasket and the plug at the other end, penetrating a fastening rod into fastening bolt holes corresponding to the plugs at the two ends of the infiltration suction pipe, sleeving a fastening nut on the fastening rod for sealing and fixing, and weighing the weight m of the infiltration suction pipe0(ii) a The porous medium is preferably quartz sand;
(2) detecting the gas permeability of the porous medium in the infiltration pipe by using a gas permeability instrument, and calculating the gas permeability K of the porous medium in the infiltration pipe by applying Darcy formula according to corresponding parameters measured by the gas permeability instrumentg(ii) a The gas permeability instrument has the advantages of simple structure, convenient operation, high measuring speed, high precision and the like, is an indispensable experimental device for conventional rock core analysis, belongs to the prior art, and is clear to technical personnel in the field of experimental principles, operation methods and experimental steps, and is not detailed herein;
(3) the oil outlet at the outlet end of the infiltration and suction pipe is closed, and the speed of the oil outlet is 1ml/min from the oil outlet at the inlet end of the infiltration and suction pipeInjecting saline water until the saline water injected into the infiltration suction pipe is saturated, no saline water is absorbed in the infiltration suction pipe, then continuously injecting saline water for 5min, and weighing the weight m of the infiltration suction pipe after saturated saline water1And calculating the pore volume PV (m) of the porous medium1-m0)/ρSalt water，ρSalt waterThe density of brine injected at normal temperature;
(4) opening an oil outlet at the outlet end of the infiltration and suction pipe, displacing the porous medium in the infiltration and suction pipe by using saline water for 3-5 times of the pore volume PV, specifically, opening the oil outlet at the outlet end of the infiltration and suction pipe, injecting the saline water from the oil outlet at the inlet end of the infiltration and suction pipe at the speed of not higher than 3ml/min until the pressure curve of an injection end is stable and the volume of the injected fluid is 3-5 PV, recording the final pressure (namely the final displacement pressure) at the outlet end of the infiltration and suction pipe, and calculating by applying Darcy's formula to obtain the water permeability K of the porous medium in the infiltration and suction pipeH；
(5) Heating crude oil to the temperature of a simulated oil reservoir, injecting the heated crude oil from an oil outlet at an inlet end of an imbibition tube at a speed of 0.5ml/min until the crude oil flows out from an oil outlet at an outlet end of the imbibition tube, and measuring the total water yield V of the oil outlet at the outlet end of the imbibition tubeWater (W)Calculating the oil saturation Soi ═ VWater (W)/PV)×100％；
(6) Closing oil outlets at the inlet end and the outlet end of the infiltration suction pipe, after aging for 15d at the simulated oil reservoir temperature, taking off plugs at two ends of the infiltration suction pipe, transversely placing the infiltration suction pipe into an infiltration suction bottle, filling an infiltration suction agent to be screened into the infiltration suction bottle, covering a threaded sealing cover for sealing, recording the scale value of the arrival of the infiltration suction agent, then placing the infiltration suction bottle at the simulated oil reservoir temperature for experiment, recording the volume of crude oil precipitated in the infiltration suction pipe every 2 hours until the volume of the precipitated crude oil is not changed, and recording the volume value VOilCalculating the imbibition recovery factor (V)Oil/VWater (W))×100％；
The inlet and outlet ends of the suction pipe are not limited to a specific direction.
The method can better simulate the imbibition effect of stratum matrix rock under a certain temperature condition by putting the porous medium and the aged crude oil into the imbibition pipe, and measure the permeability through gas measurement and water measurementAnd the detection of the data of the rate and the imbibition recovery ratio can judge the imbibition effect of different imbibition agents under the condition of a target oil reservoir, and provide more reliable data for the screening of the imbibition agents. Gas permeability KgPermeability measured with water KHThe detection ensures the consistency of the experimental conditions of each time of the imbibition agent screening experiment, and avoids the influence of different experimental conditions on the screening result; the operation of 15d aging of the imbibition tube can enable the porous medium and the crude oil to better approach the simulated formation state, and improve the reliability of the imbibition agent screening.
Compared with the prior art, the imbibition agent evaluation experimental device for imbibition oil production can be used for carrying out imbibition oil production experiments at high temperature, can better simulate the imbibition effect of stratum matrix rock under a certain temperature condition, has a visual imbibition effect, and simultaneously replaces a rock core with a porous medium and aged crude oil for carrying out experiments, so that the cost is low, the test screening time can be greatly shortened, and the experiment period is shortened.
Drawings
FIG. 1 is a schematic structural diagram of an experimental apparatus according to the present invention;
FIG. 2 is a schematic view of the construction of the infiltration pipe of the present invention;
FIG. 3 is a schematic structural view of the plug of the present invention;
FIG. 4 is a schematic structural view of a porous gasket of the present invention.
The labels in the figure are:
1-imbibition bottle, 11-graduated tube, 12-inlet, 13-screw thread sealing cover;
2-infiltration suction pipe, 21-pipe body, 22-plug, 23-porous gasket,
221-cover plate, 222-boss, 223-fastening bolt hole, 224-oil outlet, 225-oil outlet channel, 226-sealing ring and 227-sealing ring;
3-fastening rods and 4-fastening nuts.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and the detailed description. In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Referring to fig. 1 to 4, the invention provides an imbibition agent evaluation experimental device for imbibition oil production, which comprises an imbibition bottle 1 and an imbibition tube 2, wherein the top end of the imbibition bottle 1 is provided with a graduated tube 11, an inlet 12 is formed below a bottle body of the imbibition bottle 1, and the inlet 12 is sealed by a thread sealing cover 13;
the seepage and suction pipe 2 comprises a hollow pipe body 21, a plug 22 and a porous gasket 23, wherein the plug 22 is used for sealing two ends of the pipe body, the porous gasket 23 is arranged in the pipe body, the diameter of the porous gasket 23 is the same as the inner diameter of the pipe body 21, the plug 22 comprises a cover plate 221 and a boss 222 fixed on the cover plate 221, a fastening bolt hole 223 and an oil outlet 224 are arranged on the cover plate 221, the oil outlet 224 is communicated with an oil outlet channel 225, the oil outlet channel 225 is arranged inside the plug 22, the boss 222 is plugged in the pipe body 21, and the outer diameter of the boss 222 is the same as the inner diameter of the pipe body 21. The three fastening bolt holes 223 are arranged at equal angles and equal distances by taking the center of the cover plate 221 as a circle center, so that the sealing and fixing of the plugs at the two ends are ensured; the boss 222 is provided with a sealing ring 226, the sealing ring 226 is sleeved with a sealing ring 227, more preferably, the boss is provided with more than two sealing ring rings, and the arrangement can further enhance the sealing performance of the two ends of the permeation suction pipe body.
Furthermore, the infiltration bottle is made of a temperature-resistant pressure-resistant transparent non-metallic material; the body of infiltration pipe adopts the transparent non-metallic material preparation of temperature resistant withstand voltage, specifically is temperature resistant withstand voltage's glass material, makes things convenient for the observation of infiltration suction experiment effect and bears the experimental temperature and the pressure of target oil reservoir, makes the experiment more be close to target oil reservoir condition, and the experimental result is more reliable.
Furthermore, the surfaces of the infiltration and suction bottle and the infiltration and suction pipe are provided with oil-dredging layers. This oleophobic layer set up to prior art, can realize through adding oleophobic ingredient in the preparation material, and the accuracy of experimental result can further be improved in the setting up of oleophobic layer.
The method of using the experimental apparatus of the present invention will be described with reference to specific examples, which simulate the temperature condition of the oil reservoir at 70 ℃ and carry out the screening experiments using the imbibition agents SX-1, SX-2 and SX-3 manufactured by Shanghai Yuqing chemical Co., Ltd.
The specific operation method is as follows:
(1) as shown in figure 2, a porous gasket 23 and a plug 22 are arranged at one end of the infiltration pipe, quartz sand with the grain diameter of 160-plus 180 meshes is filled into the infiltration pipe from the other end of the infiltration pipe to a scale mark, the infiltration pipe is placed into a centrifuge to be centrifuged for 20min at a centrifugation speed of 3600r/min, the quartz sand with the grain diameter of 160-plus 180 meshes is filled into the infiltration pipe to the scale mark again, the porous gasket 23 and the plug 22 at the other end are arranged, a fastening rod 3 penetrates into a fastening bolt hole 223 corresponding to the plugs at the two ends of the infiltration pipe, a fastening nut 4 is sleeved on the fastening rod 3 to be sealed and fixed, and then the weight m of the infiltration pipe is weighed0＝77.31g；
(2) Detecting the gas permeability of the porous medium in the infiltration pipe by using a gas permeability instrument, and calculating the gas permeability K of the porous medium in the infiltration pipe by applying Darcy formula according to corresponding parameters measured by the gas permeability instrumentgIs 282.6X 10-3μm2；
(3) Sealing the outlet of the seepage and suction pipe, injecting saline water from the outlet of the inlet of the seepage and suction pipe at the speed of 1ml/min until the saline water injected into the seepage and suction pipe is saturated, stopping absorbing the saline water in the seepage and suction pipe, and then continuously injecting the saline water for 5min, wherein the density of the injected saline water is rhoSalt water＝1.02g/cm-3Then weighing the weight m of the imbibition tube after saturated saline water183.49g, the pore volume PV of the porous medium is calculated to be (m)1-m0)/ρSalt water＝6.05ml；
(4) Will ooze the suction pipeOpening an oil outlet at the outlet end, using saline water to displace the porous medium in the infiltration suction pipe by 3-5 times of the pore volume PV, specifically, opening the oil outlet at the outlet end of the infiltration suction pipe, injecting the saline water from the oil outlet at the inlet end of the infiltration suction pipe at a speed of not more than 3ml/min until the pressure curve of the injection end is stable and the injection fluid volume is 3-5 PV, recording the final pressure at the outlet end of the infiltration suction pipe, and calculating by applying Darcy formula to obtain the water permeability K of the porous medium in the infiltration suction pipeHIs 192.5 mu m2；
(5) Heating crude oil to a simulated oil reservoir temperature of 70 ℃, injecting the heated crude oil from an oil outlet at an inlet end of an imbibition tube at a speed of 0.5ml/min until the crude oil flows out from an oil outlet at an outlet end of the imbibition tube, and measuring the total water yield V of the oil outlet at the outlet end of the imbibition tubeWater (W)The oil saturation, Soi, (V) was calculated as 5.2mlWater (W)/PV)×100％＝85.9％；
(6) Closing oil outlets at the inlet end and the outlet end of the imbibition tube, after aging for 15d at the simulated oil reservoir temperature, taking off plugs at two ends of the imbibition tube, transversely placing the imbibition tube into an imbibition bottle (transversely placing the imbibition bottle to avoid gravity influence), filling an imbibition agent SX-1 to be screened into the imbibition bottle, covering a threaded sealing cover for sealing, recording the reaching scale value of the imbibition agent, then placing the imbibition bottle at the simulated oil reservoir temperature for experiment, recording the volume of crude oil precipitated in the imbibition tube every 2 hours until the volume of the precipitated crude oil is not changed, recording the volume value V after 38 hours, wherein the volume value V is recordedOil2.35mL, calculated imbibition factor (V)Oil/VWater (W))×100％＝45.2％。
The method has high oil seepage and extraction speed, and multiple experiments of the inventor show that the method can finish oil seepage and extraction in 1-2 days generally, the volume of the extracted crude oil is not changed, the experiment time is greatly saved, and the working strength of experimenters is reduced.
Experiments on the imbibing agents SX-2 and SX-3 are carried out by repeating the steps (1) to (6), and specific data are shown in the following table:
gas permeability KgPermeability measured with water KHThe detection ensures that the experimental conditions of each time of the imbibition agent screening experiment are basically consistent, and avoids the influence of different experimental conditions on the screening result; as can be seen from the above table, SX-1 has the best imbibition effect.
The screening results of the method of the present invention are verified by the existing core experimental method, which is specifically as follows:
(1) and selecting a core of the target oil reservoir according to the experimental requirements, wherein the size phi of the core is 2.5 x 10 cm.
(2) According to the experimental requirements, the core is washed and dried, and the size of the core is measured: diameter and length (measured 3 times or more), and the weight M of the dried core is weighed0＝99.37g。
(3) Detecting the gas logging permeability of the rock core by using a gas permeability instrument, and calculating the gas logging permeability K of the rock core by applying a Darcy formula according to corresponding parameters measured by the gas permeability instrumentgIs 19.2X 10-3μm2；
(4) Vacuumizing the core, keeping the pressure to be about-0.09 MPa, vacuumizing for 6h, filling the core into a core holder, and injecting saline (the density of the saline is 1.02 g/cm)-3) Until the salt water is saturated, putting the core after the salt water is saturated on an electronic balance, and weighing the weight M of the core1The core pore volume PV was calculated as (M) 103.34g1-M0)/ρSalt water＝3.89mL；
(5) Opening an outlet valve of the core holder, using saline water to displace the core by 3-5 times of the pore volume PV, specifically, injecting the saline water from an inlet of the core holder at a speed of not more than 3ml/min until a pressure curve of an injection end is stable and the volume of injected fluid is 3-5 PV, recording the pressure at an outlet end of the core holder, and calculating by applying Darcy formula to obtain the core water permeability KHIs 11.6X 10-3μm2；
(6) Heating crude oil to a simulated oil reservoir temperature of 70 ℃, injecting the heated crude oil from the inlet of the core holder at a speed of 0.5ml/min until the crude oil flows out of the outlet of the core holder, and measuring the total water yield V of the outlet of the core holderWater (W)The oil saturation, Soi, (V) was calculated as 1.92mlWater (W)/PV)×100％＝49.3％；
(7) Sealing the rock core with preservative film and adhesive tape, aging for 15 days at simulated oil reservoir temperature, taking out the rock core, putting the rock core into an imbibition bottle, filling an imbibition agent SX-1 to be screened into the imbibition bottle, covering a thread sealing cover for sealing, recording the scale value of the imbibition agent, recording the volume of crude oil precipitated in the rock core every 12h until the volume of the precipitated crude oil is not changed (the imbibition rate of the rock core is slow, the imbibition time generally needs to be 10-15d to complete imbibition oil), recording the volume of the precipitated crude oil after 13 days and a half, and recording the volume value VOil0.41mL, calculated imbibition recovery ratio VOil/VWater (W)×100％＝21.3％。
Experiments on the imbibing agents SX-2 and SX-3 are carried out by repeating the steps (1) to (7), and specific data are shown in the following table:
the core experiment also proves that the imbibition effect of SX-1 is the best and is consistent with the experimental result of the invention.
In summary, the imbibition agent evaluation experimental device for imbibition oil recovery provided by the invention can perform an imbibition oil recovery experiment at a high temperature, can better simulate the imbibition effect of stratum matrix rock under a certain temperature condition, and has a visual imbibition effect.
While there have been shown and described the fundamental principles and essential features of the invention and advantages thereof, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof; the present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. Imbibition agent evaluation experimental apparatus for imbibition oil recovery, its characterized in that: including infiltration suction bottle and infiltration straw, the top of infiltration suction bottle has the scale mark pipe, open the bottle below of infiltration suction bottle has the import, the infiltration straw includes hollow body, is used for sealing the end cap at body both ends and sets up the porous gasket in the body, and porous gasket's diameter is the same with the body internal diameter, the end cap includes the cover plate and fixes the boss on the cover plate, be provided with fastening bolt hole and oil-out on the cover plate, fastening bolt hole uses the cover plate center to be provided with threely as the equidistance of centre of a circle equidistance of an angle, oil-out and oil outlet channel intercommunication, the oil outlet channel setting is inside the end cap, the boss stopper is in the body, boss external diameter size is the same with body internal diameter size, the seal ring has been seted up on the boss, and the cover has the sealing washer ring on the seal ring.
2. The imbibition agent evaluation experimental device for imbibition oil recovery as recited in claim 1, characterized in that: the infiltration bottle is made of a temperature-resistant pressure-resistant transparent non-metallic material.
3. The imbibition agent evaluation experimental device for imbibition oil recovery as recited in claim 1, characterized in that: the pipe body of the infiltration pipe is made of a temperature-resistant pressure-resistant transparent non-metallic material.
4. The imbibition agent evaluation experimental device for imbibition oil recovery as recited in claim 1, characterized in that: and oil-dredging layers are arranged on the surfaces of the seepage bottle and the seepage pipe.
5. The imbibition agent evaluation experimental device for imbibition oil recovery as recited in claim 1, characterized in that: the bottle body inlet of the infiltration and absorption bottle is sealed by adopting a thread sealing cover.
6. The imbibition agent evaluation experimental device for imbibition oil recovery as recited in claim 1, characterized in that: more than two sealing ring rings are arranged on the boss.
7. An experimental method for evaluating an imbibition agent for imbibition oil production using the experimental device according to any one of claims 1 to 6, characterized in that: the method comprises the following steps:
(1) installing a porous gasket and a plug at one end of the infiltration suction pipe, loading a porous medium to a scale mark from the other end of the infiltration suction pipe, after centrifuging at a centrifugal rate of 3600r/min for 20min, supplementing the porous medium to the scale mark into the infiltration suction pipe again, installing the porous gasket and the plug at the other end, penetrating a fastening rod into fastening bolt holes corresponding to the plugs at two ends of the infiltration suction pipe, sleeving a fastening nut on the fastening rod for sealing and fixing, weighing the weight m of the infiltration suction pipe0；
(2) Detecting the gas permeability of the porous medium in the infiltration pipe by using a gas permeability instrument, and calculating the gas permeability K of the porous medium in the infiltration pipe by applying Darcy formula according to corresponding parameters measured by the gas permeability instrumentg；
(3) Sealing the outlet of the permeation tube, injecting saline water from the outlet of the inlet of the permeation tube at a speed of 1ml/min until the permeation tube is saturated, continuously injecting the saline water for 5min, and weighing the weight m of the permeation tube after the saturated saline water1Calculating the pore volume PV ═ m of the porous medium1-m0)/ρSalt water，ρSalt waterThe density of brine injected at normal temperature;
(4) opening an oil outlet at the outlet end of the imbibition tube, displacing the porous medium in the imbibition tube by using saline water for 3-5 times of the pore volume PV, recording the final displacement pressure, and calculating by using Darcy formula to obtain the water permeability K of the porous medium in the imbibition tubeH；
(5) Heating crude oil to the temperature of a simulated oil reservoir, injecting the heated crude oil from an oil outlet at the inlet end of the imbibition tube at the speed of 0.5ml/min until the crude oil flows out from the oil outlet at the outlet end of the imbibition tube, and measuring the total water yield V of the oil outlet at the outlet end of the imbibition tubeWater (W)Calculating the oil saturation Soi ═ VWater (W)/PV)×100％；
(6) Closing oil outlets at the inlet end and the outlet end of the infiltration suction pipe, aging for 15d at the simulated oil reservoir temperature, then taking off plugs at the two ends of the infiltration suction pipe, transversely placing the infiltration suction pipe into an infiltration suction bottle, filling an infiltration suction agent to be screened into the infiltration suction bottle, covering a threaded sealing cover for sealing, recording the scale value reached by the infiltration suction agent, then placing the infiltration suction bottle at the simulated oil reservoir temperature for experiment, recording the volume of crude oil precipitated in the infiltration suction pipe every 2 hours until the volume of the precipitated crude oil is not changed, and recording the volume value VOilCalculating the imbibition recovery factor (V)Oil/VWater (W))×100％；
The inlet and outlet ends of the suction pipe are not limited to a specific direction.
8. The method of claim 7, wherein the method comprises the steps of: the porous medium is quartz sand.
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