CN111793486A - Carbon dioxide gas-thermal composite blocking remover, preparation method and application thereof - Google Patents
Carbon dioxide gas-thermal composite blocking remover, preparation method and application thereof Download PDFInfo
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Abstract
The invention relates to the field of blocking remover, in particular to a carbon dioxide gas-thermal composite blocking remover, a preparation method and application thereof. The carbon dioxide gas-heat composite blocking remover comprises a component A, a component B and a component C; the component A comprises 10-20 wt% of dicarboxylic acid and the balance of water, wherein the total amount of the component A is 100 wt%; the component B comprises 5-10 wt% of urea, 10-20 wt% of ammonium salt and the balance of water, wherein the total amount of the component B is 100 wt%; and the component C comprises 20-40 wt% of nitrite and the balance of water, wherein the total amount of the component C is 100 wt%. The composite blocking remover provided by the invention is green and environment-friendly, harmless to human health, good in blocking removing effect, high in dissolution rate of blocking substances, and capable of remarkably improving the petroleum yield of low-permeability oil-gas fields.
Description
Technical Field
The invention relates to the field of blocking remover, in particular to a carbon dioxide gas-thermal composite blocking remover, a preparation method and application thereof.
Background
For low permeability oil fields, zone blockage is increased continuously along with the prolonging of production time, seepage resistance is increased, so that the yield is reduced continuously, in order to remove the blockage, an acidification process is mostly adopted for removing the blockage, but due to the ubiquitous heterogeneity of a reservoir stratum, the extraction degree of a high permeability layer is relatively high, or the high permeability layer is generally high in water content, while the low permeability layer is relatively high in seepage resistance and relatively low in extraction degree due to low permeability, so that the method is a modification object of yield increasing measures.
The aim of acidification is mainly to remove blockage, simultaneously improve the permeability of a low-permeability potential layer as much as possible and improve the yield of an oil well, but when the conventional acidification is adopted, because the pressure of a high-permeability layer is relatively low, acid liquor enters the high-permeability layer preferentially, so that the purpose of increasing the yield of the high-permeability layer cannot be achieved through over acidification, or a large amount of water is discharged after acidification, and the low-permeability layer is used as a target layer for acidification and blockage removal, so that the purpose of increasing the yield of the oil well cannot be achieved through relatively less acid entering. In addition, for reservoirs with lower stratum energy, although the purpose of removing the blockage is achieved by adopting conventional acidification, the purpose of increasing the petroleum yield cannot be achieved.
In recent years, the technology of utilizing the chemical heat generation to remove the stifled more and more receives attention, although utilize the exothermic gassing reaction of nitrite and ammonium chloride heat generation solution in the oil reservoir to reach certain unblocking effect, however, its reaction is too fast, take place the reaction in the pumping process, produce a large amount of gas, reduce pumping efficiency, the deep unblocking effect is poor, can cause thermal loss simultaneously, produce toxic gases such as nitric oxide and nitrogen dioxide, seriously pollute the environment, harm the respiratory track, bring very big potential safety hazard for the construction. For example, in patent CN101323780B, nitrogen and carbon dioxide generated by the reaction of sodium nitrite and urea are used for deblocking, the generated energy and heat are limited, and the deep layer deblocking effect is poor; patent CN106567698A provides a method for improving oil recovery ratio by a self-generated carbon dioxide system after polymer flooding, and the used gas release agent is hydrochloric acid, and nitrogen monoxide and nitrogen dioxide toxic gases are generated when carbon dioxide is generated, so that the health of human bodies is damaged; in patent CN103555307A, chemical blockage removal and thermochemical blockage removal are combined, the thermochemical blockage removal energy source is nitrogen, and the oil displacement effect is relatively not ideal; the acid used in patent CN1106447A is phosphoric acid, which also generates more toxic gases of nitric oxide and nitrogen dioxide, causing a problem of harm to human health, and in addition, the oil-increasing effect thereof needs to be improved. Therefore, the gas-thermal composite blocking remover which is green and environment-friendly, relatively safe to human bodies, high in blocking removal rate and good in petroleum yield increasing effect is urgently needed to be provided.
Disclosure of Invention
In view of the problems in the prior art, the invention provides a carbon dioxide gas thermal composite blocking remover, which comprises a component A, a component B and a component C; the component A comprises 10-20 wt% of dicarboxylic acid and the balance of water, wherein the total amount of the component A is 100 wt%; the component B comprises 5-10 wt% of urea, 10-20 wt% of ammonium salt and the balance of water, wherein the total amount of the component B is 100 wt%; and the component C comprises 20-40 wt% of nitrite and the balance of water, wherein the total amount of the component C is 100 wt%.
As a preferable technical scheme of the invention, the component A further comprises 3-7 wt% of acid anhydride.
In a preferred embodiment of the present invention, the acid anhydride is a cyclic acid anhydride.
As a preferred embodiment of the present invention, the cyclic acid anhydride is selected from one or more of succinic anhydride, phthalic anhydride, glutaric anhydride, and maleic anhydride.
As a preferred technical solution of the present invention, the dicarboxylic acid is selected from one or more of succinic acid, citric acid, oxalic acid, maleic acid, and phthalic acid.
As a preferred embodiment of the present invention, the ammonium salt is ammonium nitrate and/or ammonium chloride.
As a preferable technical scheme of the invention, the component A further comprises 0.1-1 wt% of an organic phosphonic acid scale inhibitor.
As a preferable technical scheme of the invention, the component A further comprises 0.1-1 wt% of surfactant, which comprises polyether nonionic fluorocarbon surfactant and zwitterionic fluorocarbon surfactant.
As a preferable technical scheme of the invention, the polyether nonionic fluorocarbon surfactant comprises a first component, and the weight average molecular weight of the first component is 800-1000.
The invention provides an application of a carbon dioxide gas-thermal composite blocking remover in a low-permeability oil-gas field.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the invention, the component A and the component B are subjected to a thermochemical reaction to generate a large amount of nitrogen, carbon dioxide and high-temperature hot water, and simultaneously, along with a large amount of heat, the gas carries energy to enter an oil layer at a high speed, so that the blockage removing effect is improved;
(2) the dicarboxylic acid is used in the invention, so that the generation of nitric oxide and nitrogen dioxide is reduced, and the preparation method is green and environment-friendly;
(3) the succinic anhydride improves the deep plugging removal effect and increases the petroleum yield;
(4) the components of the invention are mutually synergistically promoted, and the petroleum yield is improved.
Detailed Description
The present invention is illustrated by the following specific embodiments, but is not limited to the specific examples given below.
The invention provides a carbon dioxide gas-thermal composite blocking remover in a first aspect, which comprises a component A, a component B and a component C.
In one embodiment, the weight ratio of component A, component B and component C is (1.5-2.5): 1: (1.5-2.5); preferably, the weight ratio of the component A to the component B is 2: 1: 2.
component A
In one embodiment, the component A comprises 10 to 20 wt% of dicarboxylic acid, and the balance of water, calculated as 100 wt% of the total.
In one embodiment, the component A further comprises 3 to 7 wt% of acid anhydride.
In one embodiment, the component A further comprises 0.1-1 wt% of an organic phosphonic acid scale inhibitor.
In one embodiment, the component A further comprises 0.1 to 1 wt% of a surfactant.
In a preferred embodiment, the component A comprises 10 to 20 wt% of dicarboxylic acid, 3 to 7 wt% of acid anhydride, 0.5 wt% of organic phosphonic acid scale inhibitor, 0.1 to 1 wt% of surfactant and the balance of water, wherein the total amount is 100 wt%.
< dicarboxylic acids >
In one embodiment, the dicarboxylic acid is selected from one or more of succinic acid, citric acid, oxalic acid, maleic acid, phthalic acid.
Preferably, the dicarboxylic acid is phthalic acid.
The applicant unexpectedly finds that when the dicarboxylic acid, particularly one or more of succinic acid, citric acid, oxalic acid, maleic acid and phthalic acid is used, particularly phthalic acid, the dicarboxylic acid is environment-friendly and has a good blockage removing effect, the applicant guesses that the probable reason is that the succinic acid, the citric acid, the oxalic acid, the maleic acid and the phthalic acid are relatively weak in acidity, the stability of sodium nitrite is ensured to a certain extent, the reaction of the sodium nitrite is inhibited, the generation of nitric oxide and nitrogen dioxide is inhibited, the process is safe and environment-friendly, in addition, the consumption of the sodium nitrite caused by the reaction of the sodium nitrite is avoided to a certain extent, the possibility of heat generated by the reaction of the sodium nitrite and urea is reduced, and the blockage removing effect is improved. Meanwhile, the phthalic acid has higher rigidity, can enter rock gaps and clay mineral layers under the urging of energy, further participates in reaction, and improves the blockage removing effect.
< acid anhydride >
In one embodiment, the anhydride is a cyclic anhydride.
Preferably, the cyclic anhydride is selected from one or more of succinic anhydride, phthalic anhydride, glutaric anhydride, and maleic anhydride.
Preferably, the anhydride is succinic anhydride.
The applicant unexpectedly finds that when a certain amount of anhydride, particularly succinic anhydride, is added into the component A, the deep blockage removing effect can be further improved, and the applicant believes that the probable reason is that along with the participation of urea in the reaction to release energy and heat, the succinic anhydride enters the deep part of the stratum, absorbs the heat in the stratum and the heat released after the reaction of part of urea, decomposes the heat into succinic acid, continuously initiates substances in the component A and the component B to participate in the reaction, so that a large amount of nitrogen and heat are generated, the blockage removing effect is continuously exerted, and the deep blockage removing effect is achieved.
< organic phosphonic acid-based Scale inhibitor >
In one embodiment, the organic phosphonic acid-based scale inhibitor is selected from one or more of 2-phosphonobutane-1, 2, 4-tricarboxylic acid, sodium ethylene diamine tetra methylene phosphonate, hydroxyethylidene diphosphonic acid, aminotrimethylene phosphonic acid.
Preferably, the organic phosphonic acid scale inhibitor is hydroxyethylidene diphosphonic acid.
The applicant has surprisingly found that the scale inhibition effect on this system is better when using hydroxyethylidene diphosphonic acid.
< surfactant >
In one embodiment, the surfactants include polyether nonionic fluorocarbon surfactants and zwitterionic fluorocarbon surfactants.
Fluorocarbon surfactants are a class of surfactants that can significantly reduce the surface tension of a solvent at very low concentrations. The fluorocarbon surfactant is the most important variety of special surfactants, and means that hydrogen atoms in a hydrocarbon chain of the hydrocarbon surfactant are completely or partially replaced by fluorine atoms, namely, the fluorocarbon chain replaces the hydrocarbon chain, so that a non-polar group in the surfactant not only has hydrophobic property, but also has oleophobic property.
The nonionic fluorocarbon surfactant can be mainly divided into four major categories, namely polyethylene glycol type, sulfoxide type, polyol type and polyether type, wherein the polyethylene glycol type is most applied and researched. The nonionic fluorocarbon surfactant is more soluble in water and organic solvents than other types of surfactants, and has better compatibility with other types of surfactants. In addition, the water-soluble polymer is not ionized in an aqueous solution and is not influenced by the pH value of a medium and inorganic salt basically.
The simultaneous existence of basic (or cationic) groups and acidic (anionic) groups is an obvious characteristic of amphoteric fluorocarbon surfactant molecules, wherein the basic groups are mainly amino groups or quaternary ammonium groups, and the acidic groups are mainly sulfonic groups, carboxylic groups, phosphate groups and the like. Amphoteric fluorocarbon surfactants behave as anionic surfactants or cationic surfactants depending on the pH of the medium.
The zwitterionic fluorocarbon surfactant is widely applied in chemical engineering and is one of the main ingredients of the foam extinguishing agent. In addition, the emulsifier has excellent emulsifying performance, and is often used as an emulsifier in the manufacturing process of products such as fluorocarbon materials, paper, leather and the like.
In one embodiment, the weight ratio of the polyether nonionic fluorocarbon surfactant to the zwitterionic fluorocarbon surfactant is (0.3-0.8): 1; more preferably, the weight ratio of the polyether nonionic fluorocarbon surfactant to the zwitterionic fluorocarbon surfactant is 0.5: 1.
in one embodiment, the polyether nonionic fluorocarbon surfactant comprises a first component, and the weight average molecular weight of the first component is 800-1000.
Preferably, the weight average molecular weight of the first component is 950.
Weight average molecular weight: the molecular weights of all synthetic polymers and most natural polymers are heterogeneous and are mixtures of homologues of different molecular weights. Molecular weight and distribution are one of the most basic structural parameters of polymeric materials.
Statistical average molecular weight averaged over molecular weights of different molecular weights in the polymer. The weight average molecular weight is a statistical average molecular weight by mass, and is an average molecular weight obtained on a unit weight basis.
In one embodiment, the polyether nonionic fluorocarbon surfactant further comprises a second component with 6-10 carbon atoms.
Preferably, the weight ratio of the second component to the first component is (0.1-0.5): 1; more preferably, the weight ratio of the second component to the first component is 0.3: 1.
preferably, the number of carbon atoms of the second component is 8.
Preferably, the second component is selected from one or more of TF281, TF380, XW-201; more preferably, the second component is TF 281.
In one embodiment, the zwitterionic fluorocarbon surfactant is selected from one or more of Zonyl FS-500, Capscone FS-50, Capscone FS-51, RK-8410.
Preferably, the zwitterionic fluorocarbon surfactant is Zonyl FS-500.
In one embodiment, the weight ratio of surfactant, dicarboxylic acid, and anhydride is 1: (48-52): (15-20); preferably, the weight ratio of the surfactant, the dicarboxylic acid and the anhydride is 1: 50: 16.7.
the applicant unexpectedly found that by using polyether nonionic fluorocarbon surfactant and zwitterionic fluorocarbon surfactant, particularly, the zwitterionic fluorocarbon surfactant is Zonyl FS-500, the weight average molecular weight of the first component is 800-1000, and the weight ratio of the surfactant to dicarboxylic acid to anhydride is 1: (48-52): (15-20) the petroleum yield increase of the high-temperature oil layer is high, the applicant considers that the possible reasons are that the compatibility of the weight-average molecular weight of 800-1000 and Zonyl FS-500 is good, and complementary to each other, when the Zonyl FS-500 and the first component with the weight-average molecular weight of 800-1000 exist, the critical micelle concentration is reduced, the liquid film is denser, the stability of the liquid film is improved, the permeability of the liquid film to organic impurities is obviously improved, the liquid film can penetrate into organic polymer molecules, and the weight ratio of the liquid film to dicarboxylic acid and anhydride is 1: (48-52): (15-20), the heat and energy generated by the reaction of the dibasic acid, the sodium nitrite and the urea can enable the foam generated by the surfactant to be firstly positioned in the oil layer with relatively high permeability, so that the heat and energy and part of the liquid film are more deep into the oil layer with relatively low permeability. In addition, the applicant unexpectedly found that when the polyether nonionic fluorocarbon surfactant further comprises a second component with 6-10 carbon atoms, particularly the carbon atom number is 8, the permeability of the polyether nonionic fluorocarbon surfactant to an oil layer is remarkably improved, and the applicant guesses that the possible reasons are that the addition of TF281 increases the regularity of the molecular structure of a liquid film in the structure, enhances the high-temperature stability, does not cause the breakage of the liquid film under huge energy, and the obtained aggregates of spherical micelles and lamellar micelles, which are distributed in a staggered manner, can effectively reduce the surface interfacial tension and increase the activity, realize the maximum contact with crude oil, reduce the molecular weight and viscosity of an organic polymer and increase the oil yield, and meanwhile, the weight ratio of the polyether nonionic fluorocarbon surfactant to dicarboxylic acid and anhydride is 1: (48-52): (15-20) the contact with urea is not adversely affected.
Component B
In one embodiment, the component B comprises 5-10 wt% of urea, 10-20 wt% of ammonium salt and the balance of water.
Preferably, the component B comprises 6 wt% of urea, 12 wt% of ammonium salt and the balance of water.
< Urea >
Urea, also known as carbamide (carbomide), is an organic compound consisting of carbon, nitrogen, oxygen, and hydrogen, which is a white crystal. One of the simplest organic compounds is the main nitrogen-containing end product of the metabolic breakdown of proteins in mammals and certain fish, and is also the nitrogen fertilizer with the highest nitrogen content at present.
As a neutral fertilizer, urea is suitable for various soils and plants. It is easy to preserve, convenient to use, and has little destructive effect on soil, and is a chemical nitrogen fertilizer with larger use amount at present. The synthesis of urea is carried out industrially with ammonia and carbon dioxide under certain conditions.
< ammonium salt >
In one embodiment, the ammonium salt is ammonium nitrate and/or ammonium chloride.
Preferably, the ammonium salt is ammonium nitrate.
Component C
In one embodiment, the component C, calculated as 100 wt% of the total, comprises 20 to 40 wt% of nitrite, and the balance is water.
Preferably, component C comprises 25 wt% nitrite, with the balance being water.
< nitrite salt >
In one embodiment, the nitrite is not particularly limited in kind, and sodium nitrite, ammonium nitrite, potassium nitrite, and the like can be exemplified.
Preferably, the nitrite salt is sodium nitrite. The technical principle on which the invention is based is as follows:
after the carbon dioxide gas-heat composite blocking remover is injected into the stratum, the composite blocking remover is triggered to carry out thermochemical reaction under certain conditions of the stratum, the thermochemical reaction can produce a large amount of nitrogen, carbon dioxide and high-temperature hot water, and simultaneously along with the production of a large amount of heat, the effect of removing the blocking is achieved by means of energy and heat generated by the thermochemical reaction.
The chemical reaction equation involved in the present invention is as follows:
CO(NH2)2+NH4 ++3NO2 -+2H+＝3N2+CO2+5H2O+Q
NO2 -+NH4 +＝N2+2H2O+Q
the component A, the component B and the component C in the carbon dioxide gas-heat composite blocking remover are respectively and independently stored.
The use method of the carbon dioxide gas-thermal composite blocking remover comprises the following steps: extruding component C into the formation; extruding component B into the formation; component a is squeezed into the formation.
The sequence of extruding the component A, the component B and the component C into the stratum is not particularly limited, and after extruding one of the components into the stratum, a spacer fluid can be added by a person skilled in the art according to the needs.
The spacer fluid of the present invention is not particularly limited, and may be conventionally selected by those skilled in the art.
The invention provides an application of a carbon dioxide gas-thermal composite blocking remover in a low-permeability oil-gas field.
Low permeability oil and gas field: the special oil-gas field is a low-permeability oil-gas field with a special geological structure, mainly refers to an oil field, and is characterized in that an oil extraction aid is difficult to inject and crude oil is difficult to recover, the development of the low-permeability oil field is a worldwide difficult problem at present, technical bottlenecks of no injection and no recovery exist generally, and the research on the prediction method for improving the oil extraction speed is a leading-edge problem of the exploration and development of the low-permeability oil-gas field.
The third invention provides a preparation method of a carbon dioxide gas-thermal composite blocking remover, which comprises the following steps:
(1) preparation of component A: mixing all the components in the component A, and uniformly stirring to prepare a component A;
(2) preparation of component B: mixing all the components in the component B, and uniformly stirring to prepare a component B;
(3) preparation of component C: and mixing the components in the component C, and uniformly stirring to prepare the component C.
Examples
Hereinafter, the present invention will be described in more detail by way of examples, but it should be understood that these examples are merely illustrative and not restrictive. The starting materials used in the examples which follow are all commercially available unless otherwise stated.
Example 1
The embodiment 1 of the invention provides a carbon dioxide gas-thermal composite blocking remover, which consists of a component A, a component B and a component C in a weight ratio of 2: 1: 2.
the component A comprises 10 weight percent of dicarboxylic acid, 3.3 weight percent of acid anhydride, 0.5 weight percent of organic phosphonic acid scale inhibitor, 0.2 weight percent of surfactant and the balance of water according to the total weight of 100 weight percent.
The component B is 5 wt% of urea, 10 wt% of ammonium salt and the balance of water, calculated as 100 wt% of the total.
The component C is 20 wt% of nitrite and the balance is water, calculated as 100 wt% of the total.
The dicarboxylic acid is phthalic acid; the nitrite is sodium nitrite; the anhydride is succinic anhydride; the organic phosphonic acid scale inhibitor is hydroxyethylidene diphosphonic acid; the surfactant comprises a polyether nonionic fluorocarbon surfactant and a zwitterionic fluorocarbon surfactant, and the weight ratio of the surfactant to the surfactant is 0.3: 1; the polyether nonionic fluorocarbon surfactant comprises a first component and a second component, and the weight ratio of the first component to the second component is 0.1: 1; the weight average molecular weight of the first component is 950, and the mark is Zonyl FSN-100; the second component is TF 281; the zwitterionic fluorocarbon surfactant is Zonyl FS-500.
The ammonium salt is ammonium nitrate.
The preparation method of the carbon dioxide gas-heat composite blocking remover comprises the following steps:
(1) preparation of component A: mixing all the components in the component A, and uniformly stirring to prepare a component A;
(2) preparation of component B: mixing all the components in the component B, and uniformly stirring to prepare a component B;
(3) preparation of component C: and mixing the components in the component C, and uniformly stirring to prepare the component C.
The carbon dioxide gas-heat composite blocking remover is applied to low-permeability oil and gas fields.
Example 2
The embodiment 2 of the invention provides a carbon dioxide gas-thermal composite blocking remover which comprises a component A, a component B and a component C in a weight ratio of 2: 1: 2.
the component A comprises 20 weight percent of dicarboxylic acid, 6.7 weight percent of acid anhydride, 0.5 weight percent of organic phosphonic acid scale inhibitor, 0.4 weight percent of surfactant and the balance of water according to the total weight of 100 weight percent.
The component B is 10 wt% of urea, 20 wt% of ammonium salt and the balance of water, calculated as 100 wt% of the total.
The component C is 40 wt% of nitrite and the balance is water, calculated as 100 wt% of the total.
The dicarboxylic acid is phthalic acid; the nitrite is sodium nitrite; the anhydride is succinic anhydride; the organic phosphonic acid scale inhibitor is hydroxyethylidene diphosphonic acid; the surfactant comprises a polyether nonionic fluorocarbon surfactant and a zwitterionic fluorocarbon surfactant, and the weight ratio of the surfactant to the surfactant is 0.8: 1; the polyether nonionic fluorocarbon surfactant comprises a first component and a second component, and the weight ratio of the first component to the second component is 0.5: 1; the weight average molecular weight of the first component is 950, and the mark is Zonyl FSN-100; the second component is TF 281; the zwitterionic fluorocarbon surfactant is Zonyl FS-500.
The ammonium salt is ammonium nitrate.
The preparation method of the carbon dioxide gas-thermal composite blocking remover comprises the following steps:
(1) preparation of component A: mixing all the components in the component A, and uniformly stirring to prepare a component A;
(2) preparation of component B: mixing all the components in the component B, and uniformly stirring to prepare a component B;
(3) preparation of component C: and mixing the components in the component C, and uniformly stirring to prepare the component C.
The carbon dioxide gas-heat composite blocking remover is applied to low-permeability oil and gas fields.
Example 3
The embodiment 3 of the invention provides a carbon dioxide gas-thermal composite blocking remover, which consists of a component A, a component B and a component C in a weight ratio of 2: 1: 2.
the component A comprises 15 wt% of dicarboxylic acid, 5 wt% of acid anhydride, 0.5 wt% of organic phosphonic acid scale inhibitor, 0.3 wt% of surfactant and the balance of water, wherein the weight percentage is calculated by 100 wt% of the total.
The component B is 6 wt% of urea, 12 wt% of ammonium salt and the balance of water, calculated as 100 wt% of the total.
The component C is 25 wt% of nitrite and the balance of water calculated by 100 wt% of the total.
The dicarboxylic acid is phthalic acid; the nitrite is sodium nitrite; the anhydride is succinic anhydride; the organic phosphonic acid scale inhibitor is hydroxyethylidene diphosphonic acid; the surfactant comprises a polyether nonionic fluorocarbon surfactant and a zwitterionic fluorocarbon surfactant, and the weight ratio of the surfactant to the surfactant is 0.5: 1; the polyether nonionic fluorocarbon surfactant comprises a first component and a second component, and the weight ratio of the first component to the second component is 0.3: 1; the weight average molecular weight of the first component is 950, and the mark is ZonylFSN-100; the second component is TF 281; the zwitterionic fluorocarbon surfactant is Zonyl FS-500.
The ammonium salt is ammonium nitrate.
The preparation method of the carbon dioxide gas-heat composite blocking remover comprises the following steps:
(1) preparation of component A: mixing all the components in the component A, and uniformly stirring to prepare a component A;
(2) preparation of component B: mixing all the components in the component B, and uniformly stirring to prepare a component B;
(3) preparation of component C: and mixing the components in the component C, and uniformly stirring to prepare the component C.
The carbon dioxide gas-heat composite blocking remover is applied to low-permeability oil and gas fields.
Example 4
Embodiment 4 of the present invention provides a carbon dioxide gas-thermal composite blocking remover, which is the same as embodiment 3 in the specific implementation manner, except that the component a is 15 wt% of phosphoric acid, 5 wt% of acid anhydride, 0.5 wt% of organic phosphonic acid type scale inhibitor, 0.3 wt% of surfactant, and the balance of water, calculated as total 100 wt%.
The preparation method of the carbon dioxide gas-heat composite blocking remover comprises the following steps:
(1) preparation of component A: mixing all the components in the component A, and uniformly stirring to prepare a component A;
(2) preparation of component B: mixing all the components in the component B, and uniformly stirring to prepare a component B;
(3) preparation of component C: and mixing the components in the component C, and uniformly stirring to prepare the component C.
The carbon dioxide gas-heat composite blocking remover is applied to low-permeability oil and gas fields.
The embodiment quickly generates reddish brown gas in the using process of the blocking remover, and is not in accordance with the concept of green environmental protection.
Example 5
Embodiment 5 of the present invention provides a carbon dioxide gas-thermal composite blocking remover, which is the same as embodiment 3 in specific implementation manner, except that the dicarboxylic acid is oxalic acid.
The preparation method of the carbon dioxide gas-heat composite blocking remover comprises the following steps:
(1) preparation of component A: mixing all the components in the component A, and uniformly stirring to prepare a component A;
(2) preparation of component B: mixing all the components in the component B, and uniformly stirring to prepare a component B;
(3) preparation of component C: and mixing the components in the component C, and uniformly stirring to prepare the component C.
The carbon dioxide gas-heat composite blocking remover is applied to low-permeability oil and gas fields.
Example 6
Embodiment 6 of the present invention provides a carbon dioxide gas-thermal composite blocking remover, which is the same as embodiment 3 in the specific implementation manner, except that the component a is 15 wt% of dicarboxylic acid, 0.5 wt% of organic phosphonic acid type scale inhibitor, 0.3 wt% of surfactant, and the balance of water, calculated as total 100 wt%.
The preparation method of the carbon dioxide gas-heat composite blocking remover comprises the following steps:
(1) preparation of component A: mixing all the components in the component A, and uniformly stirring to prepare a component A;
(2) preparation of component B: mixing all the components in the component B, and uniformly stirring to prepare a component B;
(3) preparation of component C: and mixing the components in the component C, and uniformly stirring to prepare the component C.
The carbon dioxide gas-heat composite blocking remover is applied to low-permeability oil and gas fields.
Example 7
Embodiment 7 of the present invention provides a carbon dioxide gas thermal composite deblocking agent, which is implemented in the same manner as embodiment 3, except that the acid anhydride is acetic anhydride.
The preparation method of the carbon dioxide gas-heat composite blocking remover comprises the following steps:
(1) preparation of component A: mixing all the components in the component A, and uniformly stirring to prepare a component A;
(2) preparation of component B: mixing all the components in the component B, and uniformly stirring to prepare a component B;
(3) preparation of component C: and mixing the components in the component C, and uniformly stirring to prepare the component C.
The carbon dioxide gas-heat composite blocking remover is applied to low-permeability oil and gas fields.
Example 8
Embodiment 8 of the present invention provides a carbon dioxide gas-thermal composite blocking remover, which is the same as embodiment 3 in the specific implementation manner, except that the acid anhydride is phthalic anhydride.
The preparation method of the carbon dioxide gas-heat composite blocking remover comprises the following steps:
(1) preparation of component A: mixing all the components in the component A, and uniformly stirring to prepare a component A;
(2) preparation of component B: mixing all the components in the component B, and uniformly stirring to prepare a component B;
(3) preparation of component C: and mixing the components in the component C, and uniformly stirring to prepare the component C.
The carbon dioxide gas-heat composite blocking remover is applied to low-permeability oil and gas fields.
Example 9
Embodiment 9 of the present invention provides a carbon dioxide gas-thermal composite blocking remover, which is the same as embodiment 3 in specific implementation, except that the surfactants are polyether nonionic fluorocarbon surfactants and zwitterionic fluorocarbon surfactants, the polyether nonionic fluorocarbon surfactant is a first component, and the first component has a weight average molecular weight of 950 and a brand number of Zonyl FSN-100.
The preparation method of the carbon dioxide gas-heat composite blocking remover comprises the following steps:
(1) preparation of component A: mixing all the components in the component A, and uniformly stirring to prepare a component A;
(2) preparation of component B: mixing all the components in the component B, and uniformly stirring to prepare a component B;
(3) preparation of component C: and mixing the components in the component C, and uniformly stirring to prepare the component C.
The carbon dioxide gas-heat composite blocking remover is applied to low-permeability oil and gas fields.
Example 10
The embodiment 10 of the invention provides a carbon dioxide gas-thermal composite blocking remover, which is the same as the embodiment 3 in the specific implementation manner, and is different from the embodiment 3 in that the surfactants are polyether nonionic fluorocarbon surfactants and zwitterionic fluorocarbon surfactants, the polyether nonionic fluorocarbon surfactant is a second component, and the second component is TF 281.
The preparation method of the carbon dioxide gas-heat composite blocking remover comprises the following steps:
(1) preparation of component A: mixing all the components in the component A, and uniformly stirring to prepare a component A;
(2) preparation of component B: mixing all the components in the component B, and uniformly stirring to prepare a component B;
(3) preparation of component C: and mixing the components in the component C, and uniformly stirring to prepare the component C.
The carbon dioxide gas-heat composite blocking remover is applied to low-permeability oil and gas fields.
Example 11
Embodiment 11 of the present invention provides a carbon dioxide gas-thermal composite blocking remover, which is the same as embodiment 3 in specific implementation, and is different from that in embodiment 3 in that the surfactant is a polyether nonionic fluorocarbon surfactant, the polyether nonionic fluorocarbon surfactant includes a first component and a second component, and the first component is a component
FS-300, the second component is TF 281.
Example 12
Embodiment 12 of the present invention provides a carbon dioxide gas-thermal composite blocking remover, which is the same as embodiment 3 in specific embodiment except that the dicarboxylic acid is replaced with acetic acid.
The preparation method of the carbon dioxide gas-heat composite blocking remover comprises the following steps:
(1) preparation of component A: mixing all the components in the component A, and uniformly stirring to prepare a component A;
(2) preparation of component B: mixing all the components in the component B, and uniformly stirring to prepare a component B;
(3) preparation of component C: and mixing the components in the component C, and uniformly stirring to prepare the component C.
The carbon dioxide gas-heat composite blocking remover is applied to low-permeability oil and gas fields.
Performance evaluation
1. Average dissolution rate: respectively add 12 monoblock masses into the container for 0.8000g the same dirt appearance that certain well oil pipe pin in Changqing Jing oil field ann district of shape obtained, respectively add the unblocking agent that the total volume is 10mL embodiment 1 ~ 12 and obtain, begin the timing, record the time that the dirt appearance is completely dissolved, add component A earlier when wherein adding the unblocking agent and then add component B. Calculating the dissolution rate, V ═ G/(d.t), wherein V: dissolution rate, mg/(ml.min); g: mass of dirty sample, mg; d: volume of deblocking agent, mL; t: time required for complete dissolution, min; parallel experiments were set up again 4 times in the same way, respectively, the dissolution rate being calculated as the average of 5 experiments; wherein, the scale sample used in the test is a solid block of a certain well oil pipe pin in the Changqing oil field Jing' an area, the total colloid of the solid block is 6.3 percent and the inorganic substance is 78.6 percent through analysis, and the solid block is placed for 4 months and is subjected to dissolution test after air-induced dry oxidation.
2. Corrosion rate: drying calcium carbonate at 100 +/-1 ℃ to constant weight, taking out, and cooling in a dryer to room temperature; 2.0g of calcium carbonate is weighed and placed in 3 containers respectively, the blocking remover obtained in the embodiment 1-3 is added respectively, after reaction for 24 hours at the temperature of 60 ℃, filtration is carried out, a sample is washed by distilled water until the pH value of the filtrate is 7, drying and weighing are carried out, the mass is recorded as M, and the corrosion rate is calculated. The corrosion rate (%) - (2-M)/2 × 100%.
3. Application and implementation:
(1) respectively extruding the 10 cubic meters of the component C obtained in the examples 1-3 into the stratum;
(2) respectively extruding 5 cubic meters of 1 wt% potassium chloride aqueous solution;
(3) respectively extruding the components B of 5 cubic meters obtained in the examples 1-3;
(4) respectively extruding 5 cubic meters of potassium chloride aqueous solution containing 1wt percent;
(5) respectively extruding the 10 cubic meters of the component A obtained in the examples 1-3;
(6) and closing the well for 6h to finish the blockage removal of the oil well.
TABLE 1
TABLE 2
From the test results, the blocking remover provided by the invention is green and environment-friendly, has a good blocking removing effect, a high dissolution rate on blocking substances and a good petroleum yield increasing effect, and is particularly suitable for exploitation of low-permeability oil and gas fields.
The foregoing examples are merely illustrative and serve to explain some of the features of the method of the present invention. The appended claims are intended to claim as broad a scope as is contemplated, and the examples presented herein are merely illustrative of selected implementations in accordance with all possible combinations of examples. Accordingly, it is applicants' intention that the appended claims are not to be limited by the choice of examples illustrating features of the invention. Also, where numerical ranges are used in the claims, subranges therein are included, and variations in these ranges are also to be construed as possible being covered by the appended claims.
Claims (10)
1. The carbon dioxide gas-thermal composite blocking remover is characterized by comprising a component A, a component B and a component C; the component A comprises 10-20 wt% of dicarboxylic acid and the balance of water, wherein the total amount of the component A is 100 wt%; the component B comprises 5-10 wt% of urea, 10-20 wt% of ammonium salt and the balance of water, wherein the total amount of the component B is 100 wt%; and the component C comprises 20-40 wt% of nitrite and the balance of water, wherein the total amount of the component C is 100 wt%.
2. The carbon dioxide gas-thermal composite blocking remover according to claim 1, wherein the component A further comprises 3-7 wt% of acid anhydride.
3. The carbon dioxide gas-thermal composite blocking remover according to claim 2, wherein the acid anhydride is a cyclic acid anhydride.
4. The carbon dioxide gas-thermal composite blocking remover according to claim 3, wherein the cyclic anhydride is selected from one or more of succinic anhydride, phthalic anhydride, glutaric anhydride and maleic anhydride.
5. The carbon dioxide gas-thermal composite blocking remover according to claim 1, wherein the dicarboxylic acid is selected from one or more of succinic acid, citric acid, oxalic acid, maleic acid and phthalic acid.
6. The carbon dioxide gas-thermal composite blocking remover according to claim 1, wherein the ammonium salt is ammonium nitrate and/or ammonium chloride.
7. The carbon dioxide gas-thermal composite blocking remover according to any one of claims 1 to 6, wherein the component A further comprises 0.1 to 1 wt% of an organic phosphonic acid type scale inhibitor.
8. The carbon dioxide gas-thermal composite blocking remover according to any one of claims 1 to 6, wherein the component A further comprises 0.1 to 1 wt% of a surfactant, which comprises a polyether nonionic fluorocarbon surfactant and a zwitterionic fluorocarbon surfactant.
9. The carbon dioxide gas-thermal composite blocking remover according to claim 8, wherein the polyether type nonionic fluorocarbon surfactant comprises a first component, and the weight average molecular weight of the first component is 800-1000.
10. The application of the carbon dioxide gas-thermal composite blocking remover according to any one of claims 1-9 in low-permeability oil and gas fields.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112175598A (en) * | 2020-11-04 | 2021-01-05 | 广汉市华星新技术开发研究所（普通合伙） | Non-oxidative polymer cracking agent |
| CN113355076A (en) * | 2021-05-14 | 2021-09-07 | 长江大学 | Heating material for thickened oil and application thereof |
| WO2023084214A1 (en) * | 2021-11-09 | 2023-05-19 | Swellfix Uk Limited | Materials and methods to enhance mineral scale dissolution rates |
-
2020
- 2020-07-15 CN CN202010681997.7A patent/CN111793486A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112175598A (en) * | 2020-11-04 | 2021-01-05 | 广汉市华星新技术开发研究所（普通合伙） | Non-oxidative polymer cracking agent |
| CN113355076A (en) * | 2021-05-14 | 2021-09-07 | 长江大学 | Heating material for thickened oil and application thereof |
| WO2023084214A1 (en) * | 2021-11-09 | 2023-05-19 | Swellfix Uk Limited | Materials and methods to enhance mineral scale dissolution rates |
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