阅读说明：本技术 一种用于油田的固砂剂组合物及其制造方法 (Sand consolidation agent composition for oil field and manufacturing method thereof ) 是由 赵晴晴 毕海涛 张安东 王冬彬 王凤岐 裴飞 于 2020-05-27 设计创作，主要内容包括：本发明涉及一种用于油田的固砂剂组合物及其制造方法,所述固砂剂组合物由以下组分构成：a)占所述固砂剂组合物总质量约10wt％至20wt％的尿素与甲醛的缩合物；b)占所述固砂剂组合物总质量约30wt％至50wt％的呋喃树脂；c)辅助组分,所述辅助组分包括占所述固砂剂组合物总质量约0.5wt％至15wt％的固化剂；d)余量的水；并且其中,所述呋喃树脂由以下化学式表示：<Image he="168" wi="700" file="DDA0002510062510000011.GIF" imgContent="drawing" imgFormat="GIF" orientation="portrait" inline="no"></Image>在所述式1中,n取5-10,m取20-50。(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.)

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.

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.