CN111548778B

CN111548778B - Viscosity-increasing agent in liquid suspension form and preparation method thereof

Info

Publication number: CN111548778B
Application number: CN202010432056.XA
Authority: CN
Inventors: 符军放; 张高雷; 刘卫利; 许前富; 赵胜绪; 项先忠; 王学春; 丁玉; 宋茂林
Original assignee: China Oilfield Services Ltd
Current assignee: China Oilfield Services Ltd
Priority date: 2020-05-20
Filing date: 2020-05-20
Publication date: 2023-06-02
Anticipated expiration: 2040-05-20
Also published as: CN111548778A

Abstract

An adhesion promoter in the form of a liquid suspension and a method for its preparation. The viscosity-increasing agent in the form of a liquid suspension comprises 100 parts by weight of a mutual solvent, 3.5-6.7 parts by weight of an organic thickener, 0-4 parts by weight of an inorganic thickener, 0-15 parts by weight of water and 30-80 parts by weight of the viscosity-increasing agent in the form of powder. The preparation method comprises the following steps: adding the organic thickener, the inorganic thickener and water into the mutual solvent, and uniformly stirring to obtain a liquid phase solution; adding the powder-form adhesion promoter into the liquid phase solution, and uniformly stirring to obtain the liquid suspension-form adhesion promoter. The viscosity increasing agent in the form of liquid suspension has high effective content and good long-term stability, and can be rapidly dispersed in water and rapidly increased in viscosity when in use.

Description

Viscosity-increasing agent in liquid suspension form and preparation method thereof

Technical Field

The application relates to the technical field of oilfield chemicals, in particular to a viscosity increasing agent in the form of a liquid suspension and a preparation method thereof.

Background

In oilfield chemicals, adhesion promoters are morphologically distinguishable as powder and liquid forms. In field construction, the liquid-form viscosity increaser is convenient to operate and flexible to use, and is favored by users compared with powder forms. For example, biogenic gums (e.g., xanthan gum, welan gum, diutan gum, guar gum, etc.), cellulose ethers (e.g., carboxymethyl cellulose, hydroxyethyl cellulose, etc.), starch ether-based adhesion promoters, which are widely used in oil fields, when used in powder form, tend to produce "fish eyes" that are difficult to dissolve during use (i.e., dry particles that are in the form of a cohesive mass in water), thereby affecting use; the viscosity increaser in liquid form does not cause "fish eyes". For another example, during construction, powder form of the viscosity-enhancing agent is often premixed with other dry mixtures, and the preparation of the premix often requires a margin, and after the construction is completed, the margin of premix is discarded due to tank rising, so that a waste phenomenon exists; if the liquid form is changed, on one hand, the premixing process can be omitted, on the other hand, the liquid form can be directly added when in use, the waste phenomenon is avoided, and the accurate control of construction design and use is realized. As another example, as oilfield construction progresses toward continuity and intellectualization, materials used in construction need to be fluidized to meet precise metering and continuous addition. Moreover, the adhesion promoters in powder form are prone to fly ash during use. Therefore, development of the adhesion promoter in liquid form is not only for convenience of operation and flexibility of use, but also required for technical development.

Disclosure of Invention

The application provides a viscosity-increasing agent in the form of a liquid suspension, which has high effective content, good long-term stability and can be rapidly dispersed in water and rapidly thickened when in use, and a preparation method thereof.

The application provides an adhesion promoter in the form of a liquid suspension, which comprises the following components in parts by weight:

in the present application, the addition amounts of the components in the adhesion promoter in the form of a liquid suspension are calculated as the content of the effective substances. For example, the organic thickener may be added to the adhesion promoter in the form of a solution containing a solvent, but the content of the inorganic thickener is 3.5 to 6.7 parts by weight, referring to the content of the effective substance in the organic thickener solution, i.e., the pure organic thickener.

In this application, the term "mutual solvent" is defined as a material that is both miscible with water and miscible with oil, but does not dissolve the adhesion promoter in powder form of this application.

In the embodiments of the present application, the organic thickener includes an acrylic thickener, and may further include any one or both of a cellulose ether thickener and a cellulose ester thickener.

In the embodiments of the present application, the acrylic thickener may be a copolymer containing acrylate and carboxyl structural units, and optionally, the acrylic thickener may be selected from any one or more of an alkali-swellable acrylic resin and an associative acrylic resin.

In the embodiments of the present application, the cellulose ether thickener may be selected from any one or both of hydroxypropyl cellulose and ethyl cellulose.

In embodiments of the present application, the cellulose ester thickener may be cellulose acetate butyrate.

In embodiments of the present application, the inorganic thickener may be selected from any one or more of fumed silica and organic soil.

In the embodiments of the present application, the mutual solvent may be selected from any one or more of alcohol ether type mutual solvents, acetonide and limonene.

In the embodiments of the present application, the alcohol ether-based mutual solvent may be selected from any one or more of a glycol ether-based mutual solvent and a propylene glycol ether-based mutual solvent.

In the embodiments of the present application, the adhesion promoter in the form of powder may be selected from any one or more of biogel and its modifications, cellulose ether and its derivatives, polyacrylamide, polyvinyl alcohol and modified starch ether.

In embodiments of the present application, the bio-gum may be selected from any one or more of xanthan gum, welan gum, diutan gum, carrageenan, guar gum, and modifications thereof.

In embodiments of the present application, the cellulose ether adhesion promoter may be selected from any one or more of hydroxyethyl cellulose, hydroxypropyl methylcellulose, hydroxyethyl cellulose, and carboxymethyl cellulose.

In the embodiment of the present application, in the adhesion promoter in the form of the liquid suspension, the weight percentage (i.e., the effective content) of the adhesion promoter in the form of powder is not less than 20%, and optionally may be 25% -40%.

The present application also provides a method for preparing an adhesion promoter in the form of a liquid suspension as described above, comprising:

adding the organic thickener, the inorganic thickener and water into the mutual solvent, and uniformly stirring to obtain a liquid phase solution;

adding the powder-form adhesion promoter into the liquid phase solution, and uniformly stirring to obtain the liquid suspension-form adhesion promoter.

The beneficial effects of this application lie in:

(1) The viscosity increaser in the form of a liquid suspension of the present application has the following characteristics: the content of the effective matters (namely the powder-form viscosity increaser) is not less than 20 weight percent, the thixotropy is small, the pouring is smooth, and the sedimentation and layering phenomena are avoided in the storage period of more than 6 months;

(2) The viscosity increaser in the form of liquid suspension has the characteristics of quick dispersion in water and quick tackifying in the use process.

(3) The preparation method of the viscosity increaser in the form of the liquid suspension has the advantages of simple operation and high feasibility of the production process. Meanwhile, the environment-friendly raw materials are adopted, and the prepared product meets the environment-friendly requirement.

Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application. Other advantages of the present application may be realized and attained by the structure particularly pointed out in the written description and drawings.

Drawings

The accompanying drawings are included to provide an understanding of the technical aspects of the present application, and are incorporated in and constitute a part of this specification, illustrate the technical aspects of the present application and together with the examples of the present application, and not constitute a limitation of the technical aspects of the present application.

FIG. 1 is a physical view showing a state in which a liquid suspension of a part of formulations (formulation # 1, formulation # 3, formulation # 13 and formulation # 15) of the example of the present application is left in a bottle for 6 months and the bottle is turned upside down;

FIG. 2 is a pictorial view of pouring of a liquid suspension of a portion of formulations (formulation # 2, formulation # 3 and formulation # 4) of the examples of the present application;

FIG. 3 is a graph of the dissolution profile in water of a liquid suspension prepared using the method of the example (formulation # 4) of the present application and the method disclosed in U.S. Pat. No. 3,262B 2.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application will be described in detail hereinafter with reference to the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be arbitrarily combined with each other.

The sources and the products of some of the raw materials used in the examples are shown in Table 1, and other raw materials, unless otherwise specified, are all commercially available products.

TABLE 1

Example 1

Weighing a mutual solvent, an organic thickener, an inorganic thickener, water and a dry powder of an adhesion promoter according to the formula shown in tables 2-1 and 2-2, adding the organic thickener and the inorganic thickener into the mutual solvent, uniformly stirring, adding the deionized water, uniformly stirring, and standing at room temperature for 24 hours to obtain a liquid phase solution; and adding the adhesion promoter dry powder into the liquid phase solution, and uniformly stirring to obtain the adhesion promoter in the form of liquid suspension. The effective content of the adhesion promoters in the form of liquid suspensions of the respective formulations was calculated, and the bottled pour smoothness and storage stability after 6 months of standing were tested, and the test results are shown in tables 2-1 and 2-2.

Wherein (1) the effective content refers to the weight percentage of the adhesion promoter powder in the form of liquid suspension;

(2) Storing the test samples for 6 months, namely packaging the test samples into a 50ml transparent glass bottle with the bottle mouth diameter of 1cm, standing in a storage environment at 45 ℃ for 6 months, observing whether the test samples have supernatant and sedimentation, if yes, respectively marking the test samples as clear and sinking, and if not, marking the test samples as up to standard;

(3) The pouring smoothness evaluation item is that the state of the liquid suspension prepared by 40g in a 50ml transparent glass bottle with the inner diameter of 1cm is divided into 3 grades when the liquid suspension is naturally poured, the liquid suspension can be poured cleanly within 1 minute, the liquid suspension is marked as excellent, the liquid suspension can be poured cleanly basically within more than 3 minutes, the liquid suspension is marked as good, and the liquid suspension can not be poured out basically for a long time, and the liquid suspension is marked as bad.

TABLE 2-1

TABLE 2-2

The sample 1 had sedimentation and supernatant during the 6-month storage period, and the other samples did not show the sedimentation and supernatant, and the physical images and inverted states of the sample 1, sample 3, sample 13 and sample 15 after the 6-month storage period were shown in fig. 1. Some samples, although not subject to sedimentation and supernatant over a 6 month storage period, perform poorly in pouring fluency assessment, e.g., sample # 2, but still meet pumping requirements for field operations. A 2# sample having a "poor" evaluation level of pouring smoothness, a 3# sample having a "good" level, a the toppling state of the "excellent" sample No. 4 is shown in fig. 2.

Example 2

The core of the preparation method of the viscosity-increasing agent in the form of liquid suspension is that an oil-water mutual solvent is adopted as a continuous phase, and then a plurality of suspension stabilizing materials (organic thickening agent and inorganic thickening agent) are assisted, so that the viscosity-increasing agent which has the effective content of not less than 20% and is stable in storage and smooth in pouring is prepared, and the construction requirement of a continuous liquid adding system required in the development of the current oilfield construction to an intelligent direction can be met.

Xanthan gum was selected as the viscosity enhancing agent and a liquid suspension of xanthan gum dry powder was prepared by the method of example 1 of the present application and the method disclosed with reference to example 5 of U.S. patent No. 6620769B2, respectively, and the specific formulation and test results are shown in table 3.

The parallel evaluation operation of the dissolution state is as follows: 2 beakers were taken and 200ml of tap water was added respectively, then 2.5g of the liquid suspension of xanthan gum prepared by the above two methods was added respectively, the spoon was stirred for 5 times, the instant dissolution was observed, recorded and photographed as shown in fig. 3. Then, the viscosity was measured and recorded on a 6-speed viscometer with stirring 5 back and forth every 1min over 10 min.

TABLE 3 Table 3

As can be seen from the results of the parallel evaluation operation of the dissolution status, the preparation method of the present application has the characteristics of quick dissolution and quick viscosity promotion in terms of the solubility compared with the liquid suspension prepared by the preparation method disclosed in U.S. Pat. No. 3,262B 2. In addition, the method adopts the relatively environment-friendly acetone-glycerol as the continuous phase, and has obvious environment-friendly advantage compared with a preparation method adopting mineral oil as the continuous phase.

Although the embodiments disclosed in the present application are described above, the embodiments are only used for facilitating understanding of the present application, and are not intended to limit the present application. Any person skilled in the art to which this application pertains will be able to make any modifications and variations in form and detail of implementation without departing from the spirit and scope of the disclosure, but the scope of the application is still subject to the scope of the claims appended hereto.

Claims

1. The viscosity increaser in the form of liquid suspension consists of the following components in parts by weight: 100 parts of diethylene glycol butyl ether, 0.7 part of hydroxypropyl cellulose, 16.4 parts of alkali swelling acrylic thickener ASE-60, 0.7 part of fumed silica, 3.6 parts of water and 52.1 parts of xanthan gum.

2. A method of preparing an adhesion promoter in the form of a liquid suspension according to claim 1, comprising:

adding 0.7 weight part of hydroxypropyl cellulose, 16.4 weight parts of alkali swelling type acrylic thickener ASE-60, 0.7 weight part of fumed silica and 3.6 weight parts of water into 100 weight parts of diethylene glycol butyl ether, and uniformly stirring to obtain a liquid phase solution;

and adding 52.1 parts by weight of xanthan gum in the form of powder into the liquid phase solution, and uniformly stirring to obtain the viscosity increaser in the form of liquid suspension.