CN111732944A - Sand consolidation agent composition for oil field and manufacturing method thereof - Google Patents
Sand consolidation agent composition for oil field and manufacturing method thereof Download PDFInfo
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Abstract
The invention relates to a sand consolidation agent composition for an oil field and a manufacturing method thereof, wherein the sand consolidation agent composition comprises the following components: a) a condensate of urea and formaldehyde in an amount of about 10 wt% to 20 wt% of the total mass of the sand-fixing agent composition; b) furan resin accounting for about 30-50 wt% of the total mass of the sand consolidation agent composition; c) an auxiliary component comprising a curing agent in an amount of about 0.5 wt% to 15 wt% of the total mass of the sand consolidation agent composition; d) the balance of water; and wherein the furan resin is represented by the following formula:
in the formula 1, n is 5-10, and m is 20-50.
Description
Technical Field
The invention relates to the fields of polymer, organic chemistry and petrochemical industry, in particular to a sand consolidation agent composition, and more particularly relates to a sand consolidation agent composition which is particularly suitable for being used in the exploitation of relatively coarse sand oil fields.
Background
China is a country with large energy demand and consumption in the world, and energy such as petroleum and the like related to national safety is of great importance to the operation development of industrial enterprises and the smooth operation of society. For most areas in China, loose sandstone oil resources are wide in distribution and large in storage capacity, but problems of sand loosening, sand production and the like in the process of exploitation exist for a long time. Particularly, most sandstone oil fields are in a state with higher water content at present, which aggravates the damage of a stratum skeleton structure, aggravates the risk of a sand production problem, and increases the sand control difficulty. It is known to use chemical sand control or mechanical methods to prevent the loosening of sand. The chemical sand control technology can realize the fixation of the formation sand by directly injecting the sand consolidation agent group powder under the condition that the drilling well fixing equipment is basically not moved, and has the advantages of simple construction, no equipment left in a construction site, reduction of hidden dangers and the like. Especially for oil reservoirs with high content of fine silt and argillaceous substances, the chemical sand prevention effect is obviously superior to that of the traditional mechanical sand prevention method.
However, in sand exploration of a part of sandstone oil fields, coarse sand fields with large particle size distribution are found.
As shown in fig. 1, the sand particle size of the sandstone oil field in the eastern Shandong area (with the latitude being about 36-37 degrees) is randomly sampled by the inventor, and the particle size of most sandstone oil fields belongs to coarse sand (the median particle size is larger than 0.6mm, even larger than 0.5mm, wherein 0.5mm is approximately equal to 35 meshes of a standard sieve). There is a great market demand for sand consolidation techniques for coarse grained sandy oil fields.
However, the conventional chemical sand consolidation agent is suitable for fine-grained sand, and the coarse sand is difficult to achieve an excellent sand consolidation effect. Particularly for coarse sand, the sand quality is easy to loosen, and compared with the lowest industrial or enterprise standard, a higher standard of sand blocks after consolidation is needed to ensure that no deterioration or dangerous situations such as sand production and the like occur under long-term working conditions.
For sand consolidation compositions, there are continuing studies and researchers to propose new formulations and methods for sand consolidation. For example, chinese patent document CN109280544A (document 1) proposes a novel molecular membrane sand consolidation agent containing a silicon cationic polymer, which can be adjusted by PH. The sand consolidation agent composition can achieve a sand consolidation effect meeting the industrial standard in a wider sand interval, but does not improve and pay attention to the sand consolidation effect of coarse-grained sand.
Accordingly, there exists a need in the art to address one or more of the above-mentioned technical problems.
Disclosure of Invention
In view of the above-mentioned related art, an aspect of the present invention is to provide a sand consolidation agent composition suitable for use in oil fields, a method for manufacturing the same, and a sand product obtained by curing the same. In particular, the inventors have unexpectedly discovered that the sand consolidation agent composition having the components and manufacturing method of the present invention can effectively improve the requirements of chemical sand consolidation process and construction of sandstone oil field with coarse sand particles, effectively improve the production efficiency of the special oil field and ensure the need for safe production.
According to one aspect of the present invention, there is provided a sand consolidation agent composition for use in oil fields, the sand consolidation agent composition consisting of: a) a condensate of urea and formaldehyde in an amount of about 10 wt% to 20 wt% of the total mass of the sand-fixing agent composition; b) furan resin accounting for about 30-50 wt% of the total mass of the sand consolidation agent composition; c) an auxiliary component comprising a curing agent in an amount of about 0.5 wt% to 15 wt% of the total mass of the sand consolidation agent composition; d) the balance of water; and wherein the furan resin is represented by the following formula:
in the formula 1, n is 5-10, and m is 20-50.
According to an alternative, the sand consolidation agent composition of the invention, wherein the auxiliary component further comprises 1 wt% to 5 wt% of melamine formaldehyde resin; and optionally, the auxiliary component further comprises one or more of Sodium Dodecyl Sulfate (SDS)0.1 wt% to 1 wt%, carboxymethyl cellulose 1.0 wt% to 3.0 wt%, and 0.1 wt% to 0.5 wt% of a silane coupling agent KH-550.
The sand consolidation agent composition according to yet another alternative embodiment, wherein the curing agent is selected from one or more of ammonium chloride, phosphoric acid and sulfuric acid; wherein, the curing agent is preferably ammonium chloride, and the mass percent of the ammonium chloride is preferably 0.5 to 2 weight percent of the total mass of the composition.
According to the previous scheme, wherein the composition consists of: 10 to 15 wt% of the urea-formaldehyde polymer; 30 to 50 wt% of the furan resin; 1 to 3 wt% of melamine formaldehyde resin; 1 wt% of ammonium chloride; the balance of water.
In another aspect of the invention, there is provided a method of preparing an oil field sand consolidation agent composition as described above, the method comprising the steps of:
1) adding urea and glycol into a reaction container, and controlling the environment of the mixed liquid to be alkaline;
2) gradually adding formaldehyde, controlling the temperature to be between 40 and 60 ℃ in the adding process, and controlling the reaction temperature to be between 60 and 75 ℃ in the reaction process after the adding is finished to obtain a reaction product of urea and formaldehyde;
3) taking the reaction product in the step 2), adding furfuryl alcohol into the reaction product, controlling the reaction temperature to be 60-70 ℃, and obtaining the following polymer with hydroxyl groups:
4) adding polyethylene oxide into the step 3), and controlling the reaction temperature to be 40-60 ℃ to obtain the following polymerization products:
in each of the above products, n is 5 to 10; m is 20 to 50;
5) mixing the prepared components according to the mixture ratio of the components.
According to the method, in a preferable scheme, in the steps 1) and 2), the mass ratio of the urea to the glycol is (4-10) to 1, and the mass ratio of the added formaldehyde to the urea is (1-5) to 1; in the step 3), the mass ratio of the added furfuryl alcohol to the formaldehyde is (3-20) to 1; in the step 4), the mass ratio of the polyethylene oxide to the used furfuryl alcohol is (1-5): 1.
The invention also claims a sand block structure in a sandstone oil field, the sand block structure comprising sand particles having a median particle diameter (D50) of greater than 0.4mm, and a sand consolidation composition for consolidating the sand blocks, the sand consolidation composition comprising the sand consolidation composition of any of claims 1-4.
Preferably, the median particle diameter (D50) is greater than or equal to 0.5 mm.
Further preferably, the compression strength of the sand block structure is greater than 5.0Mpa, preferably greater than 5.5Mpa, more preferably greater than 6.0 Mpa.
The technical solutions and advantages of the present invention will be explained and explained in more detail below with reference to specific embodiments. It should be understood that the contents presented in the description and the detailed description are only for more clearly illustrating the technical solutions and the advantages of the present invention, and do not limit the protection scope of the present invention. On the basis of the disclosure of the specification, a person skilled in the art can modify the technical solution according to various reasonable changes, and the modified technical solution should be understood as being included in the protection scope of the invention as long as the person does not depart from the spirit of the invention.
Drawings
The accompanying drawings are included to provide a further understanding of the disclosed embodiments and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the principles of the disclosure and not to limit the disclosure.
Fig. 1 is a random sampling of sand sizes from a sandstone field in the eastern area of the mountains of the invention (at an altitude of about 36-37 degrees), wherein the abscissa represents the median size of the sand (D50) and the ordinate represents the sampling altitude of the sand.
FIG. 2 is the infrared spectrum test result of the furan resin component prepared according to example 1 of the present invention.
Detailed Description
The present invention is described in more detail below to facilitate an understanding of the invention.
Before the description of the specific embodiments, the essential fact that part of the main raw materials used have been sourced is described in the present specification. It should be noted that the sources of the raw materials described in the embodiments herein are not limiting, and those skilled in the art can select appropriate raw materials and testing equipment to perform the relevant tests and obtain the corresponding results according to the teaching and teaching of the present invention, and for raw materials which do not describe a specific manufacturer or route, those skilled in the art can select raw materials as the reaction starting materials to meet the corresponding requirements according to the disclosure and requirements of the present specification. It will also be understood from the disclosure of the present specification that the reaction starting materials for the synthesis of a portion of the compounds are derived from the initial product synthesized in the preceding step of the present invention.
Example 1: preparation of each component of sand consolidation agent composition
Preparation of components a) and b):
preparing a reaction kettle with a cooling water circulation and temperature control device, adding urea and ethylene glycol (the mass of the used raw materials is converted into the effective mass of the substances according to the purity) into the reaction kettle according to the mass ratio of 5:1, and controlling the pH value of an alkaline environment to be between 8 and 10; under the stirring state, slowly and gradually adding formaldehyde through a drainage device, controlling the temperature to be between 40 ℃ and 60 ℃, and when the addition is finished, the mass ratio of the used formaldehyde to the urea added before is 1.5: 1; then controlling the temperature at 60-75 ℃ and reacting for 2.5 hours to obtain a reaction product of urea and formaldehyde for later use. Wherein, urea
With formaldehyde
The reaction product of (a), can be expressed by the following chemical formula:
the reaction product is used as component a). Component a) is used as a sand consolidation agent composition, and a part of the composition is also used as a raw material to continuously prepare component b).
In this embodiment, half the mass of component a) is taken and furfuryl alcohol is added to the reaction solution
Adjusting the pH value of the mixture raw material to 3-4, controlling the mass ratio of the furfuryl alcohol to the formaldehyde to be 10:1, controlling the reaction temperature to be 60-70 ℃ in a reaction kettle, and controlling the reaction time to be about 3 hours; in an acidic environment, the furfuryl alcohol with component a) can form the following polymers with hydroxyl groups:
in the above polymer, n is 5 to 10.
Keeping the state of the product in the reaction kettle, and adding polyethylene oxide into the system after the system is cooled
(wherein m-20-50) the mass ratio of polyethylene oxide to furfuryl alcohol is 3: 1, controlling the reaction temperature to be 40-60 ℃ and the reaction time to be 2 hours. The following polymerization products were obtained after the polymerization reaction:
in this component, m may be 20 to 50, depending on the degree of polymerization of polyethylene oxide; n may be 5 to 10. The component obtained in this synthesis step may be referred to as furan resin or furan resin component.
The dried and washed furan resin component after the above reaction was subjected to infrared spectrum measurement, and the result is shown in fig. 2. As can be seen from the results of the IR spectrum test of FIG. 2, the product was at 3400cm-1The presence of hydroxyl group is shown by the appearance of stretching vibration peak on the left and right, and the presence of methine and methylene group is shown by the vibration peak near 2900-2800Around 1600, the oscillation peak around 1650 shows the absorption peak of the carbon-carbon double bond in the furancarbinol, while the oscillation peaks around 1290 and 1100 show the existence of the hydroxyl group and the ether of the furancarbinol, which shows that the target product is synthesized.
Finally, in this example, the composition was constructed or used, based on 100 wt% of the mass of the finally obtained composition, as the main component of 20 wt% of component a) (reaction product of urea and formaldehyde) and 50 wt% of component b (furan resin); the other auxiliary component is 3 wt% of ammonium chloride (NH)4Cl), 3 wt% melamine formaldehyde resin, and the remaining weight of water, comprise the oilfield sand consolidation agent composition of this embodiment that is particularly suitable for coarse sand particles.
Example 2: sand solidification effect experiment with coarse sand
The sandy soil layer of the oil field is obtained from the Dongying plant area of the Shengli oil field, and in order to better detect the detection effect of the sand consolidation agent composition and the sandy soil with coarser sand, sand is respectively screened by a 50-mesh sieve, a 40-mesh sieve and a 35-mesh sieve, and the sandy sand with different grain diameters is subjected to a solidification test. The composition is selected according to the proportion when in test, the total mass of the composition is about 50 g, and 100g of sandy soil with 35-mesh, 40-mesh and 50-mesh sieves is consolidated respectively. The relevant standards of other tests meet the requirements of the standard document Q/SHCG13-2017 (technical requirements of resin sand-fixing agents). The results obtained are shown in the following table:
table 1: solidification performance of sand consolidation agent composition on sand grains with different meshes
Note: the original permeability was obtained using commercially available sand stabilizer SW-91 of the same quality, obtained from Henan Hengji technology Co., Ltd; reference compressive strength 1 the same weight of 100 wt% of commercially available melamine formaldehyde resin (available from new energy limited, mid-sunshine); reference compressive strength 2 the terpolymer obtained in example 1 of document 1, which was prepared by the same weight of the laboratory simulation of the present invention, was referred to.
From the comparison, the sand consolidation agent composition prepared according to the invention is particularly suitable for sandy soil consolidation environments with large sand quality. As shown in table 1, the consolidated compositions of the invention fully meet, even far exceed, the industry-related standards (e.g., compressive strength greater than 5Mpa as specified in Q/SHCG 13-2017) compared to reference experiment 1. In contrast to the compressive strength comparison test 2, it can be seen that the composition obtained according to the embodiment of the present invention can still maintain good consolidation performance and compressive strength when the sand grains are coarser, and can still maintain good compressive strength even when the diameter of the sand grains is close to 30 meshes, which is still higher than the industry standard value or the common value.
The inventors do not wish to be bound by any theory to limit the scope of the invention. However, the inventors have experimentally and experimentally analyzed that the furan resin component produced by the specific process of the present embodiment, together with the urea-formaldehyde condensate of smaller molecular weight and possibly the auxiliary resin component, achieves better sand consolidation performance, wherein the furan resin component in molecular combination with the urea-formaldehyde condensate size better maintains the cohesion between the grit particles, facilitating the filling of the larger pores that are built up between the grits.
Example 3: sand-fixing agent compositions with different component ratios the following sand-fixing agent composition schemes (except a, b and c, the balance is water, and each component is calculated according to the percentage (wt%) of the total mass of the product) are implemented by using the components a (urea-formaldehyde polymer), b (furan resin), c (auxiliary component curing agent) and other components prepared by the invention in the above example 1.
Table 2: sand consolidation agent composition composed of different proportions
As can be seen from Table 2, in addition to the preferred components of example 1, the urea-formaldehyde polymer is preferably present in the composition of the invention in an amount of about 10 wt%, preferably not more than 15 wt%. For the furan resin component, it is preferably above 30% wt, preferably from 30 to 50% wt of the total mass of the composition; the component preferably also contains melamine formaldehyde resin about 1 wt%, more preferably 1 wt% to 3 wt%. In the interaction of the curing agent with the above components, the inventors have found that ammonium chloride is preferred, which is superior in effect to the curing agent component such as phosphoric acid or sulfuric acid.
According to the embodiments and technical contents described in the present specification, the present invention can provide at least the following technical means: while the present disclosure includes specific embodiments, it will be apparent to those skilled in the art that various substitutions or alterations in form and detail may be made to these embodiments without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents. The embodiments described herein are to be considered in all respects only as illustrative and not restrictive. The description of features and aspects in each embodiment is believed to be applicable to similar features and aspects in other embodiments. Therefore, the scope of the present disclosure should be defined not by the detailed description but by the claims, and all changes within the scope of the claims and equivalents thereof should be construed as being included in the technical solution of the present disclosure.
The invention at least provides the following technical scheme:
scheme 1: a sand consolidation agent composition for oil fields, which is characterized by comprising the following components:
a) a condensate of urea and formaldehyde in an amount of about 10 wt% to 20 wt% of the total mass of the sand-fixing agent composition;
b) furan resin accounting for about 30-50 wt% of the total mass of the sand consolidation agent composition;
c) an auxiliary component comprising a curing agent in an amount of about 0.5 wt% to 15 wt% of the total mass of the sand consolidation agent composition;
d) the balance of water; and wherein the one or more of the one,
the furan resin is represented by the following formula:
in the formula 1, n is 5-10, and m is 20-50.
Scheme 2: the sand-fixing agent composition for the oil field according to the scheme 1, characterized in that the auxiliary component further comprises 1 wt% to 5 wt% of melamine formaldehyde resin; and optionally, the auxiliary component further comprises one or more of Sodium Dodecyl Sulfate (SDS)0.1 wt% to 1 wt%, carboxymethyl cellulose 1.0 wt% to 3.0 wt%, and 0.1 wt% to 0.5 wt% of a silane coupling agent KH-550.
Scheme 3. the sand-fixation agent composition for oil field according to any of the schemes 1 to 2, wherein the curing agent is selected from one or more of ammonium chloride, phosphoric acid and sulfuric acid; wherein, the curing agent is preferably ammonium chloride, and the mass percent of the ammonium chloride is preferably 0.5 to 2 weight percent of the total mass of the composition.
Scheme 4. the sand-fixation agent composition for oil field according to any of the schemes 1 to 4, wherein the composition consists of:
10 to 15 wt% of the urea-formaldehyde polymer;
30 to 50 wt% of the furan resin;
1 to 3 wt% of melamine formaldehyde resin;
1 wt% of ammonium chloride;
the balance of water.
Scheme 5. a method of making the oil field sand consolidation agent composition of any of the schemes 1 to 5, the method comprising the steps of:
1) adding urea and glycol into a reaction container, and controlling the environment of the mixed liquid to be alkaline;
2) gradually adding formaldehyde, controlling the temperature between 40 ℃ and 60 ℃ in the adding process, and controlling the reaction temperature between 60 ℃ and 75 ℃ in the reaction process after the adding is finished to obtain a reaction product of urea and formaldehyde;
3) taking the reaction product in the step 2), adding furfuryl alcohol into the reaction product, controlling the reaction temperature to be 60-70 ℃, and obtaining the following polymer with hydroxyl groups:
4) adding polyethylene oxide into the step 3), and controlling the reaction temperature to be 40-60 ℃ to obtain the following polymerization products:
in each of the above products, n is 5 to 10; m is 20 to 50;
5) mixing the prepared components according to the proportion of the components in any one of the schemes 1 to 5.
Scheme 6. a method of making the oilfield sand consolidation agent composition of scheme 5, wherein,
in the steps 1) and 2), the mass ratio of the urea to the glycol is (4-10) to 1, and the mass ratio of the added formaldehyde to the urea is (1-5) to 1;
in the step 3), the mass ratio of the added furfuryl alcohol to the formaldehyde is (3-20) to 1;
in the step 4), the mass ratio of the polyethylene oxide to the used furfuryl alcohol is (1-5): 1.
Scheme 7. a sand block structure in a sandstone oil field, the sand block structure comprising sand particles having a median particle diameter (D50) of greater than 0.4mm, and a sand consolidation agent composition for consolidating the sand block, characterized in that,
the sand consolidation agent composition comprises the sand consolidation agent composition as set forth in any one of schemes 1-4.
Scheme 8. the sand block structure of scheme 7, wherein the median particle diameter (D50) is greater than or equal to 0.5 mm.
Scheme 9. the sand block structure according to scheme 7 or 8, having a compressive strength of more than 5.0Mpa, preferably more than 5.5Mpa, more preferably more than 6.0 Mpa.
Claims (9)
1. A sand consolidation agent composition for oil fields, which is characterized by comprising the following components:
a) a condensate of urea and formaldehyde in an amount of about 10 wt% to 20 wt% of the total mass of the sand-fixing agent composition;
b) furan resin accounting for about 30-50 wt% of the total mass of the sand consolidation agent composition;
c) an auxiliary component comprising a curing agent in an amount of about 0.5 wt% to 15 wt% of the total mass of the sand consolidation agent composition;
d) the balance of water; and wherein the one or more of the one,
the furan resin is represented by the following formula:
in the formula 1, n is 5-10, and m is 20-50.
2. The sand-fixation agent composition for oil fields according to claim 1, wherein the auxiliary component further comprises 1 to 5 wt% of melamine formaldehyde resin; and optionally, the auxiliary component further comprises one or more of Sodium Dodecyl Sulfate (SDS)0.1 wt% to 1 wt%, carboxymethyl cellulose 1.0 wt% to 3.0 wt%, and 0.1 wt% to 0.5 wt% of a silane coupling agent KH-550.
3. The sand consolidating agent composition for oil fields according to any one of claims 1 to 2, wherein the curing agent is selected from one or more of ammonium chloride, phosphoric acid and sulfuric acid; wherein, the curing agent is preferably ammonium chloride, and the mass percent of the ammonium chloride is preferably 0.5 to 2 weight percent of the total mass of the composition.
4. The sand consolidation agent composition for oil fields according to any of the claims 1 to 4, wherein the composition consists of:
10 to 15 wt% of the urea-formaldehyde polymer;
30 to 50 wt% of the furan resin;
1 to 3 wt% of melamine formaldehyde resin;
1 wt% of ammonium chloride;
the balance of water.
5. A method of making the oilfield sand consolidation agent composition of any one of claims 1-5, the method comprising the steps of:
1) adding urea and glycol into a reaction container, and controlling the environment of the mixed liquid to be alkaline;
2) gradually adding formaldehyde, controlling the temperature to be between about 40 ℃ and 60 ℃ in the adding process, and controlling the reaction temperature to be between 60 and 75 ℃ in the reaction process after the adding is finished to obtain a reaction product of urea and formaldehyde;
3) taking the reaction product in the step 2), adding furfuryl alcohol into the reaction product, controlling the reaction temperature to be 60-70 ℃, and obtaining the following polymer with hydroxyl groups:
4) adding polyethylene oxide into the step 3), and controlling the reaction temperature to be 40-60 ℃ to obtain the following polymerization products:
in each of the above products, n is 5 to 10; m is 20 to 50;
5) mixing the prepared components according to the ratio of the components in any one of claims 1-5.
6. A method of making the oilfield sand-fixation agent composition of claim 5, wherein,
in the steps 1) and 2), the mass ratio of the urea to the glycol is (4-10) to 1, and the mass ratio of the added formaldehyde to the urea is (1-5) to 1;
in the step 3), the mass ratio of the added furfuryl alcohol to the formaldehyde is (3-20) to 1;
in the step 4), the mass ratio of the polyethylene oxide to the used furfuryl alcohol is (1-5): 1.
7. A sand block structure in a sandstone oil field, the sand block structure comprising sand particles having a median particle diameter (D50) of greater than 0.4mm, and a sand consolidation agent composition for consolidating the sand block,
the sand consolidation agent composition comprises the sand consolidation agent composition of any one of claims 1 to 4.
8. A sand block structure according to claim 7 wherein the median particle diameter (D50) is greater than or equal to 0.5 mm.
9. A sand block structure according to claim 7 or 8, having a compressive strength of more than 5.0MPa, preferably more than 5.5MPa, more preferably more than 6.0 MPa.
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| CN106634920A (en) * | 2016-12-23 | 2017-05-10 | 中国石油大学(华东) | Low-density foam resin sand preventing agent suitable for sand production horizontal well of unconsolidated sandstone reservoir and preparation method of low-density foam resin sand preventing agent |
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| CN117229598A (en) * | 2023-11-10 | 2023-12-15 | 北京平储能源技术有限公司 | Molybdenum disulfide nanosheet Janus composite resin and preparation method and application thereof |
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Application publication date: 20201002 |