CN105419761B - A Modifier for Preventing Calcium Halogen Scaling - Google Patents

Abstract

The invention discloses a modifier for preventing calcium halide scaling. 2-3 parts of trimethylammonium chloride, 0.1-0.3 parts of tributyl phosphate, and the rest is water. The invention has the advantages of strong anti-scaling performance, low dosage, simple construction, no increase in work workload, strong flowback ability, cost saving and the like.

Description

A Modifier for Preventing Calcium Halogen Scaling

technical field

The invention relates to the technical field of petroleum exploitation, in particular to a modifier for preventing calcium halide scaling.

Background technique

In the process of oilfield development, workover operation is an important means to maintain the productivity of production wells and slow down the natural decline. Killing fluid is needed to balance the formation pressure during its operation, and calcium halide has a certain application proportion as killing fluid.

The application of calcium halide as a well killing fluid has the advantages of certain clay expansion inhibition, low price, and high density. However, it is reflected in its use that it is easy to cause formation scaling and often cause blockage; after entering the formation, it will emulsify with the formation fluid, and in the middle and low permeability layers, it will also form water lock damage, resulting in a decline in formation production; at the same time The higher salinity and the formation of scale will intensify the corrosion of the pipe string, and the formed scale layer is hard and firmly adhered, which is difficult to remove, and it is easy to cause problems such as pump blockage, which seriously affects the normal production and increases the production cost.

Contents of the invention

Aiming at the defects existing in the prior art, the present invention provides a modifier for preventing calcium halide scaling, which uses the effects of various chemical components to prevent calcium halide well killing fluid from scaling, and solves the problem that calcium halide is currently used as a well killing agent. Problems such as stratum scaling, clogging and corrosion intensification occurred during the application of liquid.

The application provides a modifier for preventing calcium halide fouling, its component quality formula consists of:

15-25 parts of aminotrimethylene phosphonic acid, 4-8 parts of dioctyl sodium sulfosuccinate, 2-3 parts of cetyltrimethylammonium chloride, 0.1-0.3 parts of tributyl phosphate, and the rest is water .

Preferably, the water is specifically distilled water.

Preferably, the component quality formula composition of the modifying agent that prevents calcium halide fouling is specifically:

20 parts of aminotrimethylene phosphonic acid, 5 parts of sodium dioctylsulfosuccinate, 2 parts of cetyltrimethylammonium chloride, 0.2 parts of tributyl phosphate, and 72.8 parts of distilled water.

Preferably, the component quality formula composition of the modifying agent that prevents calcium halide fouling is specifically:

15 parts of aminotrimethylene phosphonic acid, 8 parts of sodium dioctylsulfosuccinate, 3 parts of cetyltrimethylammonium chloride, 0.3 parts of tributyl phosphate, and 73.7 parts of distilled water.

Preferably, the component quality formula composition of the modifying agent that prevents calcium halide fouling is specifically:

25 parts of aminotrimethylene phosphonic acid, 4 parts of sodium dioctylsulfosuccinate, 2 parts of cetyltrimethylammonium chloride, 0.1 part of tributyl phosphate, and 68.9 parts of distilled water.

Preferably, if the aminotrimethylenephosphonic acid is a liquid reagent, the content of the aminotrimethylenephosphonic acid needs to be greater than 50%.

Preferably, if the cetyltrimethylammonium chloride is a liquid reagent, the content of the cetyltrimethylammonium chloride needs to be greater than 70%.

Preferably, if the tributyl phosphate is used as a liquid reagent, the content of the tributyl phosphate needs to be greater than 99%.

One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

1. In the examples of this application, the modifier for preventing calcium halide scaling has the advantages of strong scaling preventing performance and low dosage. During use, it can be dissolved in the calcium-halogen killing fluid at a concentration of 1% to 3% (mass percentage concentration) to achieve a very good effect of preventing scaling.

2. In the embodiment of the present application, the modifier for preventing calcium halide scaling has the advantages of simple construction and no increase in workload. This product can be used directly by mixing and dissolving with calcium-halogen well killing fluid. The dissolving speed is fast, no additional process treatment is required, and the preparation time and cost of workover fluid configuration are saved.

3. In the embodiment of the present application, the modifier for preventing calcium halide scaling has the advantage of strong flowback capability. This product can greatly reduce the interfacial tension of oil and water. During use, it can effectively reduce the interfacial tension of oil and water of calcium halogen well killing fluid and improve the flowback performance of well killing fluid.

4. In the embodiment of the present application, the modifier for preventing calcium halide scaling has the advantage of cost saving. Compared with the workover fluid aggravated to the same density with organic salt, it can save more than 50%.

Detailed ways

The embodiment of the present invention provides a modifier for preventing calcium-halogen scaling, which is mainly used in workover operations in the oil field development process, and utilizes the effects of various chemical components to prevent calcium-halogen well killing fluid from scaling and solve the problem of Problems such as formation scaling, clogging and corrosion intensification that occur when calcium halide is used as a well killing fluid are solved.

The technical solution of the embodiment of the present application is to solve the above-mentioned technical problems, and the general idea is as follows:

A modifier for preventing calcium halide fouling, its formula is composed of: 15-25 parts of aminotrimethylene phosphonic acid, 4-8 parts of dioctyl sodium sulfosuccinate, cetyltrimethylammonium chloride 2-3 parts, 0.1-0.3 parts of tributyl phosphate, and the rest is water (distilled water).

In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with specific implementation manners.

Embodiment one

This embodiment provides a modifier for preventing calcium halide fouling. Its formula consists of: 15-25 parts of aminotrimethylene phosphonic acid, 4-8 parts of dioctyl sodium sulfosuccinate, cetyl tris 2-3 parts of methyl ammonium chloride, 0.1-0.3 parts of tributyl phosphate, and the rest is water (distilled water).

For example, in terms of parts by mass, 20 parts of aminotrimethylene phosphonic acid, 5 parts of dioctyl sodium sulfosuccinate, 2 parts of cetyltrimethylammonium chloride, 0.2 parts of tributyl phosphate, and 72.8 parts of distilled water Prepare 5kg of the modifying agent for preventing calcium halide scaling. During application, the modifier for preventing calcium-halide scaling is mixed into the calcium-halogen workover fluid at a ratio of 2%, and injected into the well with a cement truck along with the workover fluid. The interfacial tension is 5.82mN/m, the anti-swelling rate is 96%, and the scale-inhibiting rate is 97.1%.

For example, in terms of parts by mass, 15 parts of aminotrimethylene phosphonic acid, 8 parts of dioctyl sodium sulfosuccinate, 3 parts of cetyltrimethylammonium chloride, 0.3 parts of tributyl phosphate, and 73.7 parts of distilled water Prepare 5kg of the modifying agent for preventing calcium halide scaling. During application, the modifier for preventing calcium-halogen scaling is mixed into the calcium-halogen workover fluid at a ratio of 3%, and injected into the well with a cement truck along with the workover fluid. The interfacial tension is 4.22mN/m, the anti-swelling rate is 97%, and the scale-inhibiting rate is 97.7%.

For example, in terms of parts by mass, 25 parts of aminotrimethylene phosphonic acid, 4 parts of dioctyl sodium sulfosuccinate, 2 parts of cetyltrimethylammonium chloride, 0.1 part of tributyl phosphate, and 68.9 parts of distilled water Prepare 5kg of the modifying agent for preventing calcium halide scaling. During application, the modifier for preventing calcium-halogen scaling is mixed into the calcium-halogen workover fluid at a ratio of 1%, and injected into the well with a cement truck along with the workover fluid. The interfacial tension is 7.13mN/m, the anti-swelling rate is 94%, and the scale-inhibiting rate is 95.4%.

All the materials used in this recipe can be purchased in the market. Among them, distilled water is used as a solvent to dissolve and suspend other raw materials, and ordinary laboratory distilled water can be used. Aminotrimethylene phosphonic acid is used as a lattice distortion agent, and if it is a liquid reagent, the content of aminotrimethylenephosphonic acid needs to be greater than 50%. Cetyltrimethylammonium chloride is used as a surfactant, and if it is a liquid reagent, the content of cetyltrimethylammonium chloride needs to be greater than 70%. Tributyl phosphate is used as a defoamer. If it is a liquid reagent, the content of tributyl phosphate must be greater than 99%.

The technical solutions in the foregoing embodiments have at least the following technical effects or advantages:

1. In the examples of this application, the modifier for preventing calcium halide scaling has the advantages of strong scaling preventing performance and low dosage. During use, it can be dissolved in the calcium-halogen killing fluid at a concentration of 1% to 3% (mass percentage concentration) to achieve a very good effect of preventing scaling.

2. In the embodiment of the present application, the modifier for preventing calcium halide scaling has the advantages of simple construction and no increase in workload. This product can be used directly by mixing and dissolving with calcium-halogen well killing fluid. The dissolving speed is fast, no additional process treatment is required, and the preparation time and cost of workover fluid configuration are saved.

3. In the embodiment of the present application, the modifier for preventing calcium halide scaling has the advantage of strong flowback capability. This product can greatly reduce the interfacial tension of oil and water. During use, it can effectively reduce the interfacial tension of oil and water of calcium halogen well killing fluid and improve the flowback performance of well killing fluid.

4. In the embodiment of the present application, the modifier for preventing calcium halide scaling has the advantage of cost saving. Compared with the workover fluid aggravated to the same density with organic salt, it can save more than 50%.

While preferred embodiments of the invention have been described, additional changes and modifications to these embodiments can be made by those skilled in the art once the basic inventive concept is appreciated. Therefore, it is intended that the appended claims be construed to cover the preferred embodiment as well as all changes and modifications which fall within the scope of the invention.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (5)

1. A kind of 1. modifying agent for preventing calcium halogen fouling, which is characterized in that the composition quality of the modifying agent of the prevention calcium halogen fouling Formula composition is：

   15-25 parts of aminotrimethylenephosphonic acid, 4-8 parts of dioctyl sodium sulphosuccinate, 2-3 parts of hexadecyltrimethylammonium chloride, 0.1-0.3 parts of tributyl phosphate, remaining be water；

   Wherein, the composition quality formula composition of the modifying agent of the prevention calcium halogen fouling, specially：

   20 parts of aminotrimethylenephosphonic acid, 5 parts of dioctyl sodium sulphosuccinate, 2 parts of hexadecyltrimethylammonium chloride, tricresyl phosphate fourth 0.2 part of ester, 72.8 parts of distilled water；Or

   15 parts of aminotrimethylenephosphonic acid, 8 parts of dioctyl sodium sulphosuccinate, 3 parts of hexadecyltrimethylammonium chloride, tricresyl phosphate fourth 0.3 part of ester, 73.7 parts of distilled water；Or

   25 parts of aminotrimethylenephosphonic acid, 4 parts of dioctyl sodium sulphosuccinate, 2 parts of hexadecyltrimethylammonium chloride, tricresyl phosphate fourth 0.1 part of ester, 68.9 parts of distilled water.
2. 2. the modifying agent of calcium halogen fouling is prevented as described in claim 1, which is characterized in that the water is specially distilled water.
3. 3. the modifying agent of the prevention calcium halogen fouling as described in claim 1~2 is any, which is characterized in that if the amino front three Fork phosphonic acids is liquid reagent, then the aminotrimethylenephosphonic acid content need to be more than 50%.
4. 4. the modifying agent of the prevention calcium halogen fouling as described in claim 1~2 is any, which is characterized in that if the cetyl Trimethyl ammonium chloride is liquid reagent, then the hexadecyltrimethylammonium chloride content need to be more than 70%.
5. 5. the modifying agent of the prevention calcium halogen fouling as described in claim 1~2 is any, which is characterized in that if the tricresyl phosphate fourth Ester need to be more than 99% as liquid reagent, then the tributyl phosphate content.