CN111257159A - Evaluation method for dispersion and removal effects of carbonaceous asphalt in carbonate reservoir - Google Patents
Evaluation method for dispersion and removal effects of carbonaceous asphalt in carbonate reservoir Download PDFInfo
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- CN111257159A CN111257159A CN202010113281.7A CN202010113281A CN111257159A CN 111257159 A CN111257159 A CN 111257159A CN 202010113281 A CN202010113281 A CN 202010113281A CN 111257159 A CN111257159 A CN 111257159A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
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Abstract
The invention discloses an evaluation method for the dispersion and removal effects of carbonaceous asphalt in a carbonate reservoir, which comprises the following steps of extracting the carbonaceous asphalt in the carbonate reservoir, weighing the carbonaceous asphalt with initial mass, stirring and mixing the carbonaceous asphalt with a dispersant solution or a remover solution to obtain a suspension, testing the turbidity and particle size of the suspension, calculating the dispersion value lambda of the carbonaceous asphalt according to the turbidity and the particle size, wherein the larger the dispersion value lambda is, the better the dispersion effect is, testing the residual mass of the carbonaceous asphalt after filtering, washing and drying the suspension, and calculating the removal rate η of the carbonaceous asphalt, wherein the larger the removal rate η is, the better the removal effect is.
Description
Technical Field
The invention relates to the technical field of carbonaceous asphalt dispersion and removal, in particular to a method for evaluating the dispersion and removal effects of carbonaceous asphalt in a carbonate reservoir.
Background
The asphalt is a mixture composed of extremely complex high-molecular hydrocarbon and non-metallic derivatives of the hydrocarbon, is one of high-viscosity organic liquids, is in a liquid state, has a black surface, and is soluble in carbon disulfide. Generally, the asphalt can be divided into three categories of coal tar asphalt, petroleum asphalt and natural asphalt. Among them, coal tar pitch is a by-product of coking. Petroleum pitch is the residue of crude oil after distillation. Natural bitumen is stored underground, and some forms a mineral layer or is accumulated on the surface of the crust.
Reservoir bitumen is one of the natural bitumens that are widely distributed in carbonate reservoirs as an associated product of oil and gas. The method has an important control effect on the physical properties of the reservoir and the transportation and the gathering of oil and gas in the later period, and the porosity and the permeability of the reservoir are reduced and the heterogeneity is enhanced by filling the asphalt.
The carbonaceous asphalt is a product of further carbonization of reservoir asphalt, is in a black solid state, and has the characteristics of carbon and hydrogen enrichment, no fluorescence, high reflectance, high maturity and the like. In the acid fracturing modification process of a carbonate reservoir, acid corrosion cracks are generated and simultaneously asphalt is dissociated, the acid corrosion flow conductivity is reduced due to the existence of free asphalt, and various carbonaceous asphalt dispersing agents or removing agents are developed to be used as additives to be added into an acid liquor system for improving the acid fracturing modification effect.
For low-maturity asphalt such as colloid asphalt, the dissolution rate or viscosity is often used as an evaluation index of a dispersant or a remover; however, the highly mature carbonaceous asphalt is not colloidal like other asphalt, but is solid particles, and for the dispersion removal of the asphalt, the current idea is to dissolve and disperse and break the asphalt partially, but a systematic evaluation method is not formed for the asphalt, and obviously, the evaluation method like colloidal asphalt cannot be applied.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a method for evaluating the dispersion and removal effects of carbonaceous bitumen in carbonate reservoirs.
The technical scheme of the invention is as follows:
a method for evaluating the dispersion and removal effects of carbonaceous asphalt in a carbonate reservoir comprises the following steps:
extracting carbonaceous bitumen in the carbonate reservoir;
weighing carbonaceous asphalt with initial mass, and stirring and mixing the carbonaceous asphalt with a dispersant solution or a remover solution to obtain a suspension;
carrying out turbidity and particle size tests on the suspension, and calculating the dispersion value lambda of the carbonaceous asphalt according to the turbidity and the particle size, wherein the larger the dispersion value lambda is, the better the dispersion effect is;
and (3) filtering, washing and drying the suspension, testing the residual mass of the carbonaceous asphalt, and calculating the removal rate η of the carbonaceous asphalt, wherein the removal effect is better when the removal rate η is larger.
Preferably, during the extraction of the carbonaceous asphalt, excessive hydrochloric acid is adopted to perform acid dissolution on the carbonate reservoir, and then the carbonate reservoir is washed, filtered and dried to obtain the carbonaceous asphalt.
Preferably, the rotation speed of the carbonaceous asphalt and the dispersant solution or the remover solution during stirring and mixing is 125 r/min-375 r/min.
Preferably, the stirring time for stirring and mixing the carbonaceous pitch and the dispersant solution or the remover solution is 10 to 45 min.
Preferably, when the suspension is tested for turbidity and particle size, the liquid in the middle of the suspension is extracted for testing.
Preferably, the method further comprises the following steps: weighing carbonaceous asphalt with the same initial mass, preparing a comparative suspension by adopting clear water, carrying out a comparative experiment, and calculating the dispersion value lambda of the carbonaceous asphalt under the action of the clear water0And removal rate η0。
Preferably, the dispersion value λ is calculated as follows:
λ＝N/D (1)
in the formula: λ is the dispersion value, NTU/μm; n is turbidity, NTU; d is the particle size, μm.
Preferably, the calculation method of the removal rate η is as follows:
wherein η is the removal rate,%, M is the initial mass of the carbonaceous asphalt, g, and M is the residual mass of the carbonaceous asphalt, g.
Compared with the prior art, the invention has the following advantages:
the method can quantitatively evaluate the action effect of the dispersing agent or the remover on the carbonaceous asphalt, has various evaluation indexes, good stability, high accuracy, good reproducibility and easy operation, can be used for detecting the action effect of various carbonaceous asphalt dispersing agents or removers, and is convenient for developers to research and develop the carbonaceous asphalt dispersing agents or removers.
Detailed Description
The present invention will be further described with reference to the following examples. It should be noted that, in the present application, the embodiments and the technical features of the embodiments may be combined with each other without conflict.
The invention provides an evaluation method for the dispersion and removal effects of carbonaceous asphalt in a carbonate reservoir, which comprises the following steps:
first, the carbonaceous bitumen in the carbonate reservoir is extracted. In a specific embodiment, during the extraction of the carbonaceous asphalt, excessive hydrochloric acid is used for acid dissolution of the carbonate reservoir, and then the carbon asphalt is obtained through washing, filtering and drying.
Secondly, the initial mass of the carbonaceous asphalt is weighed and stirred and mixed with the dispersant solution or the remover solution to obtain a suspension.
In a specific embodiment, the rotation speed during stirring and mixing is 125 r/min-375 r/min, and the stirring time is 10 min-45 min.
Then, the suspension is tested for turbidity and particle size, and the dispersion value lambda of the carbonaceous asphalt is calculated by using the formula (1) according to the turbidity and the particle size, wherein the larger the dispersion value lambda is, the better the dispersion effect is.
And finally, testing the residual mass of the carbonaceous asphalt after filtering, washing and drying the suspension, and calculating the removal rate η of the carbonaceous asphalt by adopting a formula (2), wherein the greater the removal rate η is, the better the removal effect is.
In a specific embodiment, the suspension for testing the dispersion value and the suspension for testing the removal rate are the same suspension, and in the specific operation, the dispersion value test is performed on the suspension, then the suspension after the test is mixed with the rest of the suspensions, and then the removal rate test is performed.
In another specific embodiment, the suspension for dispersion value test and the suspension for removal rate test are two suspensions configured in the same way, one of the suspensions is subjected to dispersion value test, and the other suspension is subjected to removal rate test, and at this time, the steps of dispersion value test and removal rate test can be interchanged.
Optionally, the present invention further comprises the steps of: weighing carbonaceous asphalt with the same initial mass, preparing a comparative suspension by adopting clear water, carrying out a comparative experiment, and calculating the dispersion value lambda of the carbonaceous asphalt under the action of the clear water0And removal rate η0；
If the dispersion value lambda under the action of the dispersant solution or the remover solution is less than or equal to lambda0The dispersing effect of the dispersing agent or the removing agent is not good;
if the dispersion value lambda under the action of the dispersant solution or remover solution is greater than lambda0Then λ and λ0The larger the difference is, the better the dispersing effect of the dispersing agent or the removing agent is;
if the removal rate η under the action of the dispersant solution or the remover solution is less than or equal to η0The removing effect of the dispersant or remover is not good;
if the removal rate η under the action of the dispersant solution or the remover solution is more than η0Then η and η0The greater the difference in (A) is, the removal of the dispersing or removing agentThe better the effect.
In a specific embodiment, the method for evaluating the removal effect of carbon disulfide, toluene and sodium hypochlorite specifically comprises the following steps:
1) extracting carbonaceous pitch: excessive hydrochloric acid is used for dissolving carbonate rock in a Longmai temple block Longwangguo group in Sichuan, then, the filtering is carried out, residues are washed for 2 times by distilled water and are dried in an oven at 105 ℃, and the obtained residues are the carbonaceous asphalt. In the specific operation, the dosage of the hydrochloric acid is determined according to the reaction equation of the hydrochloric acid and the carbonate rock and the weight of the carbonate rock, and the dosage of the hydrochloric acid is larger than that of the hydrochloric acid which reacts with the carbonate rock.
2) Weighing four parts of carbonaceous asphalt with the mass of 2g, respectively putting the four parts of carbonaceous asphalt into four 250mL beakers, respectively adding 200mL of clear water, a carbon disulfide solution, a toluene solution and a 15% sodium hypochlorite solution into the beakers, and stirring at the room temperature at the rotating speed of 280r/min for 25min to obtain a suspension.
3) And (2) filtering the suspension, washing the residue for 2 times by using distilled water, then drying the residue in an oven at 105 ℃, measuring that the residual mass of the carbonaceous asphalt under the action of clear water, a carbon disulfide solution, a toluene solution and a sodium hypochlorite solution is 2g, 1.9945g, 1.9951g and 1.9647g respectively, and calculating according to a formula (2) to obtain the removal rates of the carbonaceous asphalt under the action of the clear water, the carbon disulfide solution, the toluene solution and the sodium hypochlorite solution as 0%, 0.275%, 0.245% and 1.765% respectively. According to the removal rate result, the removal effect of the carbon sulfide solution and the toluene solution on the carbonaceous asphalt is slightly better than that of clear water, and the removal effect of the sodium hypochlorite solution on the carbonaceous asphalt is better.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. The method for evaluating the dispersion and removal effects of the carbonaceous asphalt in the carbonate reservoir is characterized by comprising the following steps of:
extracting carbonaceous bitumen in the carbonate reservoir;
weighing carbonaceous asphalt with initial mass, and stirring and mixing the carbonaceous asphalt with a dispersant solution or a remover solution to obtain a suspension;
carrying out turbidity and particle size tests on the suspension, and calculating the dispersion value lambda of the carbonaceous asphalt according to the turbidity and the particle size, wherein the larger the dispersion value lambda is, the better the dispersion effect is;
and (3) filtering, washing and drying the suspension, testing the residual mass of the carbonaceous asphalt, and calculating the removal rate η of the carbonaceous asphalt, wherein the removal effect is better when the removal rate η is larger.
2. The method for evaluating the dispersing and removing effects of the carbonaceous asphalt in the carbonate reservoir according to claim 1, wherein during the extraction of the carbonaceous asphalt, the carbonaceous asphalt is obtained by acid-dissolving the carbonate reservoir with an excessive amount of hydrochloric acid, and then washing, filtering and drying the carbonate reservoir.
3. The method for evaluating the dispersing and removing effect of the carbonaceous asphalt in the carbonate reservoir according to claim 1, wherein the rotation speed of the carbonaceous asphalt when the carbonaceous asphalt is stirred and mixed with the dispersant solution or the remover solution is 125 to 375 r/min.
4. The method for evaluating the dispersing and removing effects of the carbonaceous asphalt in the carbonate reservoir according to claim 3, wherein the stirring time for stirring and mixing the carbonaceous asphalt with the dispersant solution or the remover solution is 10 to 45 minutes.
5. The method for evaluating the dispersing and removing effect of carbonaceous asphalt in a carbonate reservoir according to claim 1, wherein when the suspension is subjected to turbidity and particle size tests, a liquid in the middle of the suspension is extracted for the test.
6. The method for evaluating the dispersing and removing effect of the carbonaceous asphalt in the carbonate reservoir according to claim 1, further comprising the steps of: weighing carbonaceous asphalt with the same initial mass, preparing a comparative suspension by adopting clear water, carrying out a comparative experiment, and calculating the dispersion value lambda of the carbonaceous asphalt under the action of the clear water0And removal rate η0。
7. The method for evaluating the dispersing and removing effect of the carbonaceous asphalt in the carbonate reservoir according to any one of claims 1 to 6, wherein the dispersion value λ is calculated by the following method:
λ＝N/D (1)
in the formula: λ is the dispersion value, NTU/μm; n is turbidity, NTU; d is the particle size, μm.
8. The method for evaluating the dispersing and removing effect of the carbonaceous asphalt in the carbonate reservoir according to any one of claims 1 to 6, wherein the removing rate η is calculated by the following method:
wherein η is the removal rate,%, M is the initial mass of the carbonaceous asphalt, g, and M is the residual mass of the carbonaceous asphalt, g.
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| CN202010113281.7A CN111257159A (en) | 2020-02-24 | 2020-02-24 | Evaluation method for dispersion and removal effects of carbonaceous asphalt in carbonate reservoir |
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Citations (5)
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| CN1132778A (en) * | 1994-12-07 | 1996-10-09 | 丸善石油化学株式会社 | Process for manufacturing fine particles of pitch with high softening point |
| CN103314077A (en) * | 2010-07-30 | 2013-09-18 | 费西特龙股份有限公司 | Device and method for separating mixtures that contain oil or bitumen and additives |
| CN105132000A (en) * | 2015-08-26 | 2015-12-09 | 西南石油大学 | Solvent for dissolving highly mature pyrobitumen and use method thereof |
| CN109211717A (en) * | 2018-09-19 | 2019-01-15 | 广东建浩检测科技有限公司 | A kind of method of the test of modified water-boiling method pitch and coarse aggregate adhesiveness |
| CN110806368A (en) * | 2019-11-14 | 2020-02-18 | 兖矿水煤浆气化及煤化工国家工程研究中心有限公司 | Method for rapidly evaluating dispersibility of scale inhibition and dispersion agent for gasified grey water |
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2020
- 2020-02-24 CN CN202010113281.7A patent/CN111257159A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1132778A (en) * | 1994-12-07 | 1996-10-09 | 丸善石油化学株式会社 | Process for manufacturing fine particles of pitch with high softening point |
| CN103314077A (en) * | 2010-07-30 | 2013-09-18 | 费西特龙股份有限公司 | Device and method for separating mixtures that contain oil or bitumen and additives |
| CN105132000A (en) * | 2015-08-26 | 2015-12-09 | 西南石油大学 | Solvent for dissolving highly mature pyrobitumen and use method thereof |
| CN109211717A (en) * | 2018-09-19 | 2019-01-15 | 广东建浩检测科技有限公司 | A kind of method of the test of modified water-boiling method pitch and coarse aggregate adhesiveness |
| CN110806368A (en) * | 2019-11-14 | 2020-02-18 | 兖矿水煤浆气化及煤化工国家工程研究中心有限公司 | Method for rapidly evaluating dispersibility of scale inhibition and dispersion agent for gasified grey water |
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| 曾贵玉等: "《微纳米含能材料》", 31 May 2015, 国防工业出版社 * |
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