阅读说明：本技术 驱油监测方法、用途与油田开采方法 (Oil displacement monitoring method, application and oil field exploitation method ) 是由 崔国友 姜玉柱 于 2020-04-29 设计创作，主要内容包括：本发明涉及油田开采领域,特别涉及一种驱油监测方法、用途与油田开采方法。该驱油监测方法,包括以下步骤：提供驱油材料,该驱油材料包括以下原料：酸性化合物、胺类化合物以及由驱油功能单体聚合而成的驱油聚合物；利用驱油材料进行驱油处理,并采集开发的油液作为样品采集液；在样品采集液中加入酚类化合物单体经反应后,得到具有荧光效应的测试液；对测试液进行荧光检测,将测试的荧光强度与预设的荧光强度进行对比,以确定驱油材料在油藏的作用情况。利用该方法能够解决目前驱油时将荧光物质注入油井造成增加油品加工步骤的问题。(The invention relates to the field of oil field exploitation, in particular to an oil displacement monitoring method, an application and an oil field exploitation method. The oil displacement monitoring method comprises the following steps: providing an oil displacement material, wherein the oil displacement material comprises the following raw materials: an acid compound, an amine compound and a displacement polymer polymerized by displacement functional monomers; carrying out oil displacement treatment by using an oil displacement material, and collecting developed oil as a sample collection liquid; adding a phenolic compound monomer into the sample collection liquid, and reacting to obtain a test liquid with a fluorescence effect; and performing fluorescence detection on the test solution, and comparing the tested fluorescence intensity with the preset fluorescence intensity to determine the action condition of the oil displacement material in the oil reservoir. The method can solve the problem that the oil product processing steps are increased due to the fact that the fluorescent substance is injected into the oil well during oil displacement at present.)

1. An oil displacement monitoring method is characterized by comprising the following steps:

providing an oil displacement material, wherein the oil displacement material comprises the following raw materials: an acid compound, an amine compound and a displacement polymer polymerized by displacement functional monomers; the acid compound is a polymerizable monomer compound containing an acid group and a double bond, and the amine compound at least comprises two amine groups;

carrying out oil displacement treatment by using the oil displacement material, and collecting developed oil as a sample collection liquid;

adding a phenolic compound into the sample collection liquid, and reacting to obtain a test liquid with a fluorescence effect;

and performing fluorescence detection on the test solution, and comparing the tested fluorescence intensity with a preset fluorescence intensity to determine the action condition of the oil displacement material in the oil reservoir.

2. The oil displacement monitoring method of claim 1, wherein the acidic group comprises a carboxyl group, an anhydride, or a sulfonic acid group.

3. The oil displacement monitoring method of claim 2, wherein the acidic compound comprises an acrylic compound, a maleic anhydride compound, 2-acrylamido-2-methylpropanesulfonic acid, or p-styrenesulfonic acid.

4. The method of claim 1, wherein the amine compound comprises ethylenediamine, cyclic ethylamine, polyethyleneimine or has the formula R₁H₁N-(CH₂-CH₂-NH)_n-R₂A compound of (1);

wherein n is not less than 1, and R₁、R₂Are each independently selected from H or alkyl.

5. The oil displacement monitoring method of claim 1, wherein the phenolic compound comprises a benzenediol compound or an aminophenol compound;

wherein, the benzenediol compound comprises at least one or at least one derivative of hydroquinone, resorcinol, catechol or dopamine;

the aminophenol compound includes at least one of p-aminophenol, m-aminophenol or o-aminophenol or a derivative of at least one thereof.

6. The oil displacement monitoring method of claim 1, wherein the oil displacement functional monomer comprises an acrylamide compound.

7. The drive monitoring method according to any one of claims 1-6, wherein the drive material is prepared by a method comprising: placing an acidic compound, an amine compound and a displacement of reservoir oil functional monomer in a solvent, and adding an initiator to initiate polymerization reaction to obtain a displacement of reservoir oil material;

the weight parts of the raw materials are as follows: 0.1-3 parts of acidic compound, 0.1-2 parts of amine compound, 10-200 parts of oil displacement functional monomer and 0.1-2 parts of initiator.

8. The method of claim 7, wherein the initiator comprises at least one of a persulfate, an azo salt, a sulfite, or an organic amine redox agent.

9. Use of the flooding monitoring method of any one of claims 1-8 in oil recovery.

10. An oil field exploitation method, comprising the steps of:

detecting the produced oil by using the oil displacement monitoring method according to any one of claims 1 to 8 in the oil displacement and production process of the oil field.

Technical Field

The invention relates to the field of oil field exploitation, in particular to an oil displacement monitoring method, an application and an oil field exploitation method.

Background

Substances with fluorescent properties can be detected sensitively, and the unique properties give fluorescent compounds a wide range of uses, for example: a pharmaceutical carrier, a fluorescent probe, a fluorescent image, and the like.

In the field of oilfield development, oilfield water flooding, polymer microgel or polymer microsphere flooding are widely used for oilfield development, but the water flooding front edge in the stratum and the swept range of the polymer microgel or polymer microsphere are difficult to monitor, so that fluorescent substances gradually enter the field of oilfield development. However, at present, in the oil displacement and exploitation stage of the later exploitation stage of an oil field, fluorescent substances are generally injected into an oil displacement material, then the fluorescent substances are injected into an oil well together, and then sampling is performed for detection, so that the action condition of the oil displacement material in an oil reservoir is determined according to the detected fluorescence and the intensity thereof. Therefore, the fluorescent substances inevitably enter the exploited oil product, and the fluorescent substances are required to be separated in the later period, so that the processing steps of the oil product are increased.

Disclosure of Invention

The invention aims to provide an oil displacement monitoring method, an application and an oil field exploitation method, which are used for solving the problem that the processing steps of oil products are increased by injecting fluorescent substances into an oil well during oil displacement at present.

In order to achieve the purpose, the invention provides the following technical scheme:

the first aspect of the invention provides an oil displacement monitoring method, which comprises the following steps:

providing an oil displacement material, wherein the oil displacement material comprises the following raw materials: an acid compound, an amine compound and a displacement polymer polymerized by displacement functional monomers; the acid compound is a polymerizable monomer compound containing an acid group and a double bond, and the amine compound at least comprises two amine groups;

carrying out oil displacement treatment by using the oil displacement material, and collecting developed oil as a sample collection liquid;

adding a phenolic compound into the sample collection liquid, and reacting to obtain a test liquid with a fluorescence effect;

and performing fluorescence detection on the test solution, and comparing the tested fluorescence intensity with a preset fluorescence intensity to determine the action condition of the oil displacement material in the oil reservoir.

Further, the acidic group includes a carboxyl group, an acid anhydride, or a sulfonic acid group.

Further, the acidic compound includes an acrylic compound, a maleic anhydride compound, 2-acrylamido-2-methylpropanesulfonic acid, or p-styrenesulfonic acid.

Further, the amine compound comprises ethylenediamine, cyclic ethylamine and polyethyleneimine or has a structural formula R₁H₁N-(CH₂-CH₂-NH)_n-R₂A compound of (1);

wherein n is not less than 1, and R₁、R₂Are each independently selected from H or alkyl.

Further, the phenolic compound comprises a benzenediol compound or an aminophenol compound;

wherein, the benzenediol compound comprises at least one or at least one derivative of hydroquinone, resorcinol, catechol or dopamine;

the aminophenol compound includes at least one of p-aminophenol, m-aminophenol or o-aminophenol or a derivative of at least one thereof.

Further, the oil displacement functional monomer comprises an acrylamide compound.

Further, the preparation method of the oil displacement material comprises the following steps: placing an acidic compound, an amine compound and a displacement of reservoir oil functional monomer in a solvent, and adding an initiator to initiate polymerization reaction to obtain a displacement of reservoir oil material;

the weight parts of the raw materials are as follows: 0.1-3 parts of acidic compound, 0.1-2 parts of amine compound, 10-200 parts of oil displacement functional monomer and 0.1-2 parts of initiator.

Further, the initiator comprises at least one of oxidation reducing agent consisting of persulfate, azo salt, sulfite or organic amine.

The invention also provides a method for monitoring oil displacement.

A third aspect of the invention provides a method of producing an oil field, comprising the steps of:

the oil displacement monitoring method of the first aspect of the invention is used for detecting the oil liquid during the oil displacement and exploitation process of the oil field.

The technical scheme of the invention has the following beneficial effects:

the invention provides a method for monitoring oil displacement, which comprises the steps of firstly providing a specific oil displacement material, wherein the oil displacement material comprises an acidic compound, an amine compound and an oil displacement polymer polymerized by an oil displacement functional monomer, then injecting the oil displacement material into an oil well for oil displacement, collecting and developing oil liquid as a sample collection liquid in the oil displacement process, injecting a phenolic compound into the sample collection liquid, enabling the phenolic compound to react with the oil displacement polymer in the sample collection liquid, and generating a fluorescent polymer in the sample collection liquid, thereby obtaining a test liquid with a fluorescent effect, and performing fluorescent detection on the test liquid at the moment to obtain the fluorescent intensity of the test liquid, thereby determining the action condition of the oil displacement material in the oil reservoir.

The oil displacement material used in the invention is a polymerizable monomer containing an acid group and a double bond, an amine compound is a polyamino compound (the number of amine groups is not less than 2), one acid group carboxyl in the acid compound reacts with one amine group, other amine groups are reserved, thus the polymerizable monomer containing the amine groups is generated, the monomer and an oil displacement functional monomer are polymerized to obtain a polymer containing the amine groups, the amine groups contained in the polymer can react with a phenolic compound to form fluorescent substances, and the action condition of the oil displacement material in an oil reservoir is determined by fluorescence detection during detection.

Compared with the traditional method that the fluorescent substance is injected when the oil displacement material is injected, the method can effectively reduce the external impurities in the oil product in the later period and reduce the purification and processing cost of the oil product in the later period by forming the fluorescent polymer and detecting in the detection process.

Drawings

FIG. 1 is a fluorescence spectrum of a fluorescent polymer provided in example 1 of the present invention;

FIG. 2 is a fluorescence spectrum of a fluorescent polymer provided in example 2 of the present invention;

FIG. 3 is a fluorescence spectrum of a fluorescent polymer provided in example 3 of the present invention;

FIG. 4 is a fluorescence spectrum of a fluorescent polymer provided in example 4 of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In a first aspect, an embodiment of the present invention provides an oil displacement monitoring method, including the following steps:

providing an oil displacement material, wherein the oil displacement material comprises an acidic compound, an amine compound and an oil displacement polymer formed by polymerizing an oil displacement functional monomer; the acid compound is a polymerizable monomer compound containing an acid group and a double bond, and the amine compound at least comprises two amine groups;

carrying out oil displacement treatment by using the oil displacement material, and collecting developed oil as a sample collection liquid;

adding a phenolic compound into the sample collection liquid, and reacting to obtain a test liquid with a fluorescence effect;

and performing fluorescence detection on the test solution, and comparing the tested fluorescence and the intensity thereof with the preset fluorescence intensity to determine the action condition of the oil displacement material in the oil reservoir.

The invention provides a method for monitoring oil displacement, which comprises the steps of firstly providing a specific oil displacement material, wherein the oil displacement material comprises an acidic compound, an amine compound and an oil displacement polymer polymerized by an oil displacement functional monomer, then injecting the oil displacement material into an oil well for oil displacement, collecting and developing oil liquid as a sample collection liquid in the oil displacement process, injecting a phenolic compound into the sample collection liquid, enabling the phenolic compound to react with the oil displacement polymer in the sample collection liquid, and generating a fluorescent polymer in the sample collection liquid, thereby obtaining a test liquid with a fluorescent effect, and performing fluorescence detection on the test liquid at the moment to obtain the fluorescence and the strength of the test liquid, thereby determining the action condition of the oil displacement material in the oil reservoir.

The oil displacement material used in the invention is a polymerizable monomer containing an acid group and a double bond, an amine compound is a polyamino compound (the number of amine groups is not less than 2), one acid group carboxyl in the acid compound reacts with one amine group, other amine groups are reserved, thus the polymerizable monomer containing the amine groups is generated, the monomer and an oil displacement functional monomer are polymerized to obtain a polymer containing the amine groups, the amine groups contained in the polymer can react with a phenolic compound to form fluorescent substances, and the action condition of the oil displacement material in an oil reservoir is determined by fluorescence detection during detection.

The fluorescence intensity of the test liquid is gradually enhanced along with the extension of the injection time of the oil displacement material, which indicates that the oil displacement material reaches an oil reservoir operation area and the action area of the oil displacement material is enlarged, and when the fluorescence intensity is not enhanced any more after reaching a certain time, which indicates that the oil displacement material extends to the whole oil reservoir, but the fluorescence intensity is lower than the preset fluorescence intensity, which indicates that the oil displacement material is attached to or blocked in rock gaps of the oil reservoir in the oil reservoir, so that a good oil displacement effect is achieved.

Compared with the traditional method that the fluorescent substance is injected when the oil displacement material is injected, the method can effectively reduce the external impurities in the oil product in the later period and reduce the purification and processing cost of the oil product in the later period by forming the fluorescent polymer and detecting in the detection process.

In the drive detection method of this embodiment, collection may be performed at certain time intervals when collecting a sample collection liquid.

The oil displacement material used by the oil displacement monitoring method provided by the embodiment of the invention is mainly obtained by polymerizing a polymerizable acidic compound, an amine compound and an oil displacement functional monomer.

The amine compound is mainly used for reacting with the phenol compound to form a fluorescent group in the later period, and the oil displacement functional monomer mainly plays a role in oil displacement. The oil displacement functional monomer can be a material in the existing oil displacement material, such as an acrylamide compound.

When a phenolic compound is added into a sample collecting liquid containing the oil displacing material, specific components in the oil displacing material and the phenolic compound are subjected to polymerization reaction to generate a nitrogen-containing fluorescent group with a conjugated structure. Tests show that the ultraviolet absorption wavelength of the fluorescent polymer generated in the sample collection liquid is 350-410 nm, green fluorescence is displayed under the irradiation of light with the wavelength of 365nm, the emission wavelength is 400-650 nm, and the fluorescence intensity of the fluorescent polymer is enhanced along with the increase of the pH value. Therefore, the fluorescent polymer of the present invention can exhibit strong fluorescence intensity and can be rapidly detected upon detection.

In the oil displacement monitoring method, the concentration of the fluorescent material in the test liquid can be quickly and conveniently determined by detecting the fluorescence property of the test liquid, so that the swept range of the water flooding, the polymer microgel or the polymer microsphere is judged, and a guidance function is provided for oilfield exploitation.

By way of illustration, the process of generating fluorophores in a sample collection fluid is described below by way of example of the reaction of phenol and ethylenediamine:

the process generates a fluorophore structure, and the fluorescent polymer of the invention comprises a plurality of the above fluorescent monomer structures.

As another illustrative example, the resulting fluorophore may also be of the following structure:

the fluorescent group is only an exemplary illustration, and does not represent that the fluorescent group formed in the oil displacement detection method of the present invention is limited to the above structures, and fluorescent groups with different structures can be formed according to different raw material monomers, but the structures of the fluorescent groups are all conjugated structures containing nitrogen, so that a stronger fluorescence intensity can be obtained. The generation process of the fluorescent group is only the fluorescent group obtained by the reaction mode between monomers, and because the oil displacement material is generated firstly in the actual reaction process, and then the oil displacement material and the phenolic compound monomer are reacted, the actual reaction is a complex reaction of a plurality of compounds, the reaction process does not represent the actual reaction process, and the reaction process is only a principle illustration and does not represent the actual reaction process.

In some embodiments of the invention, the acidic group comprises a carboxylic, anhydride, or sulfonic compound.

Wherein, the acidic compound includes but is not limited to acrylic compounds, maleic anhydride compounds, 2-acrylamido-2-methylpropanesulfonic acid or p-styrenesulfonic acid.

In some embodiments of the invention, the amine compound comprises ethylenediamine, cyclic ethylamine, polyethyleneimine or a compound of formula R₁H₁N-(CH₂-CH₂-NH)_n-R₂A compound of (1);

wherein n is not less than 1, and R₁、R₂Are each independently selected from H or alkyl.

Further, R in this embodiment₁、R₂Are each independently selected from H.

In some embodiments of the invention, the phenolic compound comprises a benzenediol compound or an aminophenol compound;

wherein, the benzenediol compound comprises at least one or at least one derivative of hydroquinone, resorcinol, catechol or dopamine;

the aminophenol compound includes at least one of p-aminophenol, m-aminophenol or o-aminophenol or a derivative of at least one thereof.

In some embodiments of the present invention, the oil displacing functional monomer comprises an acrylamide-based compound.

In some embodiments of the invention, the method of preparing the flooding polymer comprises: placing an acidic compound, an amine compound and a displacement functional monomer in a solvent, and adding an initiator to initiate polymerization reaction to obtain a displacement material containing a displacement polymer.

The weight parts of the raw materials are as follows: 0.1-3 parts of acidic compound, 0.1-2 parts of amine compound, 10-200 parts of oil displacement functional monomer and 0.1-2 parts of initiator.

It should be noted that the amounts of the acidic compound, the amine compound and the phenolic compound in the embodiment of the present invention are added according to the number of specifically required fluorescent groups, and are not specifically limited herein, and fluorescent groups with different specific gravities can be obtained by setting different ratios, so that different fluorescence intensities can be obtained during detection. However, by setting raw materials with different proportions, it is necessary to ensure that an amine group exists in the polymer obtained after the reaction of the acidic compound and the amine compound, so as to react with the subsequent phenol compound to generate the fluorescent substance.

The initiator used in the polymerization reaction comprises at least one of oxidation reducing agents consisting of persulfate, azo salt, sulfite or organic amine. The initiator initiates to promote the polymerization reaction.

By way of illustration, the present invention's drive monitoring method includes the steps of:

s1) mixing a certain weight part of acid compound, a certain weight part of oil displacement functional monomer, a certain weight part of amine compound and a certain weight part of water, adding a certain weight part of initiator to initiate polymerization reaction at 0-100 ℃ under the stirring action of 10-2000 r/min, and obtaining an oil displacement material after 20-120 minutes;

s2) carrying out oil displacement exploitation of the oil well by using the obtained oil displacement polymer, and collecting a part of oil liquid which is obtained in a certain exploitation process as a sample collection liquid in the exploitation process;

s3) adding a certain amount of phenolic compounds into the sample collection liquid, reacting, and reacting for not less than 1 hour at 0-100 ℃ under the stirring action of 10-2000 r/min to obtain a test liquid with a fluorescence effect;

s4) carrying out fluorescence detection on the test solution, and comparing the tested fluorescence intensity with the preset fluorescence intensity to determine the action condition of the oil displacement material in the oil reservoir.

In the process, the preset fluorescence intensity can be the fluorescence intensity of a substance obtained by polymerization reaction of the oil displacement polymer and the phenolic compound only in the same proportion, and the preset fluorescence intensity is used as a reference to determine the action condition of the oil displacement material in an oil reservoir. When the phenolic compound is added, the adding amount of the phenolic compound can be in an excessive state, so that all the oil displacement materials in the sample collection liquid completely react. The adding amount of the phenolic compound is determined according to the proportion of the amine compound in the oil-displacing polymer.

Wherein the temperature during the polymerization reaction is controlled at 0-100 deg.C, such as 0-30 deg.C, 60-80 deg.C, 0 deg.C, 10 deg.C, 15 deg.C, 18 deg.C, 20 deg.C, 30 deg.C, 35 deg.C, 40 deg.C, 45 deg.C, 60 deg.C, 70 deg.C, 80 deg.C, 90 deg.C, 100 deg.C; the reaction is carried out in the presence of air or an oxidizing agent for 1 hour or more, for example, 1.5 hours, 3 hours, 8 hours, 12 hours, and 24 hours.

In a second aspect, the embodiments of the present invention provide a use of the oil displacement monitoring method of the first aspect in oil exploitation.

The oil displacement monitoring method is applied to oil exploitation, and fluorescent substances can be prevented from being added in the exploitation stage by generating the fluorescent groups in the detection process, so that the oil quality is improved. Meanwhile, the fluorescent group generated in the detection process has a strong fluorescence effect, so that the fluorescent group can be quickly and accurately detected in the test liquid, and the method is greatly helpful for solving the monitoring problem of the water drive front edge in the stratum and the swept range of the polymer microgel or polymer microsphere.

In a third aspect, an embodiment of the present invention provides an oilfield exploitation method, including the following steps:

in the oil displacement and exploitation process of the oil field, the oil displacement monitoring method provided by the embodiment of the first aspect of the invention is used for detecting the oil which is exploited.

And comparing the detected fluorescence intensity with a preset fluorescence intensity to determine the action condition of the oil displacement material in the oil reservoir.

In the same process, the preset fluorescence intensity can be the fluorescence intensity of a substance obtained by polymerization reaction of the oil displacing polymer and the phenolic compound only in the same proportion, and the preset fluorescence intensity is used as a reference to determine the action condition of the oil displacing material in the oil reservoir.

The oil displacement monitoring method of the present invention will be further described in detail with reference to specific embodiments.