JPS60133085A - Muddy water controller - Google Patents

Abstract

PURPOSE:A muddy water controller that contains, as an active ingredient, a polyacrylic acid of a specific number-average molecular weight or its alkali metal salt which is prepared by neutralizing the polyacrylic acid to a specific level, thus giving muddy water good dispersion stability, heat resistance, salt resistance and cement resistance. CONSTITUTION:The objective controller contains, as an active ingredient, a polyacrylic acid with a number-average molecular weight of 1,000-20,000, preferably 2,000-15,000 or its alkali metal or ammonium salt or alkanolamine salt of less than 30% neutralization degree such as monoethanolamine salt. The resultant controller is used, preferably 0.02-2wt% based on muddy water and when the pH of muddy water needed, aqueous alkali such as NaOH is used. Further, the controller may be combined with other controller such as CMC.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mud water conditioner for use in water-clay mud water for defense excavation in civil engineering work and various mining development, exploration, geothermal utilization, etc. More specifically, the present invention relates to a muddy water conditioner that imparts excellent dispersion stability, heat resistance, salt resistance, and cement resistance to muddy water.

Bentonite mud is generally used as drilling mud for civil engineering work, oil poling, geothermal development, and various mining operations. This mud water construction method prevents noise, eases construction,
It is widely used due to its safety and economical advantages, but the functions of bentonite mud are to prevent ground collapse, prevent groundwater and gas from blowing out, support soil embankments, maintain excavation surfaces, and transport soil. It also acts as a lubricant.

In order to maintain the functionality of such bentonite mud water,
Various types of so-called mud water conditioners (hereinafter referred to as conditioners) have been used to adjust bentonite mud water. That is, sodium ligninsulfonate, sodium humate, carboxymethyl cellulose, sodium polyphosphate, sodium polyacrylate, and the like are used. However, due to advances in oil well drilling technology in recent years, the drilling depth has tended to increase further, and due to the necessity of drilling defenses for geothermal power generation, there is a demand for bentonite mud that is stable even under high pressure. There is. In addition, seawater slurry using seawater has been increasingly used in oil well drilling and civil engineering work in recent years.
Further, even when fresh water is used, metal ions from underground water often enter the water, but in such cases, there is a demand for bentonite muddy water that is less susceptible to the effects of metal ions. Furthermore, even in the general muddy construction method, mixing of cement and bentonite muddy water is unavoidable when concrete is placed after excavation, but this method prevents the muddy water from deteriorating due to the mixing of cement and makes it possible to recover and reuse it. There is a need for a bentonite slurry that can be reused many times.

Bentonite mud using conventionally known modifiers tends to gel or become highly viscous due to heat, inorganic salts, cement, etc., and its performance is not fully satisfactory.

The present inventors have conducted extensive research to obtain bentonite mud with excellent stability, and have found that by using a specific polymer as a modifier, bentonite mud with excellent heat resistance, salt resistance, and cement resistance can be obtained. I discovered that.

That is, the present invention uses polyacrylic acid or its neutralization degree 3.
This is a regulator containing 0% or less of an alkali metal salt, ammonium salt, or alkanolamine salt as an active ingredient.

The number average molecular weight of the polyacrylic acid used in the present invention is 10
00 to 20,000, preferably 2,000 to 150
It is 00. The effect is small outside this range.

The polyacrylic acid salt has a degree of neutralization of 30% or less, and a
If it exceeds 0%, the effect will decrease. Alkali metal salts include sodium salt, potassium salt, and lithium salt; alkanolamine salts include monoethanolamine salt, jetanolamine salt, triethanolamine salt, monoisopropanolamine salt, diisopropanolamine salt, Examples include triisopropanolamine salt.

The conditioner of the present invention is used in an amount of 0, oi to 5% by weight, preferably 0.02 to 2% by weight, based on muddy water.

v! of the present invention! 4. To obtain bentonite mud using a conditioning agent, bentonite and a conditioning agent may be added to water and mixed.

Moreover, when it is necessary to adjust the PR of bentonite mud, the obtained bentonite mud is adjusted by adding an alkaline aqueous solution such as sodium hydroxide.

The regulating agent of the present invention can also be used in combination with sodium hexametaphosphate, sodium tripolyphosphate, sodium ligninsulfonate, carboxymethyl cellulose, sodium alginate, and other known regulating agents.

It can also be applied to suspensions containing bentonite together with Seviolite, asbestos, etc.

By using the conditioner of the present invention, bentonite mud that has excellent heat resistance, salt resistance, and cement resistance and can be used in a wide range of applications can be obtained.

Hereinafter, the present invention will be specifically explained with reference to Examples.

Indicates the Department of Chungchang Department.

Practical Examples 1 to 6 6 parts of bentonite (Kunimine Kogyo ■: Kunigel v1) and 0.03 parts of the regulator of the present invention were added to 100 parts of water,
11 using Hamilton Beach mixer (API current)
The bentonite slurry was stirred at 1,000 rpm for 20 minutes. Next, 2 parts of Portland cement was added, stirred with a turbine blade at 11,000 rpm for 5 minutes, and then left to stand. The funnel viscosity of the bentonite mud was measured after 5 minutes and 30 minutes.

The results are shown in Table 1.

Example 7 Bentonite mud was obtained in the same manner as in Examples 1 to 6 using polyacrylic acid having a number average molecular weight of 16,000 as the regulator of the present invention. The pH of this muddy water was 7.8.

After adding a caustic soda aqueous solution to adjust the pH to 9.8, cement was added in the same manner as in Examples 1 to 6.
The funnel viscosity of muddy water was measured.

The results are shown in Table 1.

Comparative Examples 1 to 5 The funnel viscosity of bentonite slurry obtained using a regulator other than the present invention was measured, and the fc results are shown in Table 1.

From the results in Table 1, it can be seen that the bentonite mud using the modifier of the present invention has a low funnel viscosity and good cement resistance.

Examples 8 to 10 7 parts of bentonite (Kunigel v1), 005 parts of carboxymethyl cellulose, and 0.053 parts of the conditioning agent of the present invention were added to 100 parts of water, and the mixture was pressed with a Hamilton Beach mixer at 11,000 rpm for 20 minutes to obtain bentonite slurry. The physical properties were measured according to API standards. Next, io parts of -clay and 3 parts of cement were added, stirred for 5 minutes at 11000 rpm using a Hamilton Beach mixer, left to stand for 35 hours, and bentonite slurry was separated and collected from the upper part by side decantation, and its physical properties were measured. did. Further, 10 parts of clay and 03 parts of cement were added again, and the same operation was repeated.

The results are shown in Table 2.

Comparative Examples 6 to 8 Tests similar to Examples 8 to 1O were conducted using regulators other than those of the present invention. The results are shown in Table 2.

As can be seen from these results, when the conditioner of the present invention is used, the stability against cement and clay is excellent, and the number of repeated uses of bentonite mud can be increased.

Example 11 100 parts of water, 6 parts of bentonite (Kunigel v1) and polyacrylic acid (number average molecular weight 11
6,000) was added and stirred for 20 minutes at 11,000 rpm using a Hamilton Beach mixer to obtain bentonite slurry.

Add a certain amount of 3 parts % sodium chloride aqueous solution to this and
After stirring for a minute under the same conditions, the viscosity was measured using a B-type viscometer.

(30% chloride was added in the same manner) A certain amount of IJium aqueous solution was added, and the viscosity was measured after stirring.The operation was repeated to determine the relationship between the amount of sodium chloride added and the viscosity. The results are shown in Figure 1.

Comparative Examples 9 to 10 Comparative Example 9 uses polyacrylic acid (number average molecular d
6ooo) The relationship between the amount of sodium chloride added and the viscosity was determined in the same manner as in Example 11, except that sodium [neutralization degree 90%] was used, and in Comparative Example 10, bentonite mud was adjusted without using a regulator. I met.

The results are shown in Figure 1.

From FIG. 1, it can be seen that the bentonite mud using the modifier of the present invention has a small increase in viscosity and has a high ability to prevent gelation against IJium (chloride).

Example 12 and Comparative Examples 11-12 Same as Example 11 and Comparative Examples 9-10 except that 20% calcium chloride aqueous solution was used instead of sodium chloride aqueous solution and the amount of regulator added was 0.04 part. The relationship between the amount of Ca ions added and the viscosity of bentonite mud was determined.

The results are shown in FIG. 2, and it can be seen that the bentonite mud using the modifier of the present invention has a small increase in viscosity and has a high ability to prevent gelation against Ca+" ions.

Examples 13 to 18 7 parts of bentonite (Kunigel v1) and 0.06 parts of the conditioner of the present invention were added to 100 parts of water, and the mixture was stirred for 20 minutes at 11,000 rpm using a Habarton Beach mixer to obtain bentonite mud. In Example 15, the pH was adjusted to 10.0 using an aqueous sodium hydroxide solution. Next, the bentonite mud was cured at 200° C. for 16 hours, and the physical properties (apparent viscosity, plastic viscosity, yield value, and gel strength) before and after curing were measured.

The results are shown in Table 3.

Comparative Examples 13-14 Bentonite mud was prepared using a conditioning agent other than the present invention, and the physical properties were measured in Example 17 in the same manner as Examples 13-16. The amount of adjusting agent used was 0.006 parts in Comparative Example 13 and 3 parts in Comparative Example 14.
Department. In Comparative Example 14, the pH was adjusted to 100 using an aqueous sodium hydroxide solution.

The results are shown in Table 3.

From Table 3, it can be seen that the bentonite mud using the conditioning agent of the present invention has a small apparent viscosity, plastic viscosity, yield value, and gel strength after curing, indicating that it has a high ability to prevent gelation and thickening due to heating.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the relationship between the amount of sodium chloride added and the viscosity of bentonite mud in Example 11 and Comparative Examples 9 and 10. FIG. 2 is a diagram showing the relationship between the amount of Ca ion added and the viscosity of bentonite mud in Example 12 and Comparative Examples 11 and 12. Patent applicant: NOF Corporation

Claims (1)

[Claims] 1 - A muddy water conditioner containing polyacrylic acid having a number average molecular weight of 1,000 to 20,000 or an alkali metal salt, ammonium salt or alkanolamine salt thereof having a degree of neutralization of 30 or less as an active ingredient.