SU1488297A1 - Mineralized clayey drilling mud - Google Patents

Description

The invention relates to the drilling of wells. The purpose of the invention is to improve the filtration and structural-mechanical properties while preventing

foaming solution. The drilling fluid contains the following ingredients in their ratio, May. %: clay 10.0-30.0; mineralizer 10.5—26.5; superplasticizer based on sulphate-containing acrylate production wastes (SPA) 0.1 - 0.5; water - the rest. Clay of any mineralogical composition can be used in the solution. Sodium chloride and calcium chloride are used as a mineralizer, and Aplassan superplasticizer is used as a SPA. The solution is prepared by mixing the ingredients. The use of the SPA solution in the solution allows its filtration and structural-mechanical properties to be improved while simultaneously preventing foaming. The use of the solution in field conditions reduces the cost of well construction. 1 tab.

<c

The invention relates to the drilling of wells, namely to the solutions used for their flushing.

The purpose of the invention is to improve the filtration and structural-mechanical properties while preventing foaming of the solution.

The mineralized mud contains the following ingredients, May. %

Clay 10-30

Mineralizer 10.5—26.5

Superplasticizer based

sulphate-containing waste acrylate production 0.1—0.5

Water Rest

Aplassan superplasticizer was used as a superplasticizer based on sulphate-containing acrylate production wastes (SPA).

The solution is prepared by mixing the ingredients.

Example. To prepare solution 2, 715 ml of water is poured into the container for mechanical mixing, 100 g of bentonite clay powder are added. The clay is hydrated in water for 30 minutes. Then 150 g of mineralizer (\ aC?) Is added to the clay solution. After dissolving the salt, 5 g of SPA is added. The drilling fluid is stirred for 1 hour. Then, the technological parameters are measured by the known method. ·

Composition and properties of drilling fluids,

prepared in accordance with the example given in the table.

1488297

3

From the data of the table it follows that the drilling mud solution containing the FHLS reagent under the conditions of chlorine-sodium and polyvalent salt aggressions has high values of structural and mechanical properties and filtration: F 18–22 cm ³ (experiments 7–11, 18–19, 25–26, 33–34, 41–42).

Drilling mud containing SPA in conditions of chlorine-sodium (No. CE 10%) and polyvalent (ΝβΟΒ 10% and СаСР _g 0.5%). Yu aggression has satisfactory values of structural-mechanical parameters:

HC 56-24 s, СНС1 / 10 68 / 90—19 / 21 EPa, F 9—16 cm ³ .

This drilling mud does not undergo foaming, has a higher pH value (pH 8-9) and does not require the addition of an additional amount of alkaline agent. The density of the solution after the introduction of SP'A into it remains unchanged, while after the introduction of 20 FHLS, the density decreases due to pricing — the gas content is 0.4-6.5%.

The study of the structural-mechanical and filtration properties of the drilling fluid was carried out on samples prepared from various types of clays with different degrees of mineralization (table).

In experiments 1-11, Ijevan bentonite and mineralization of 10.5% were used (No.SE- (4-CASEG), in experiments 12-26 - kaolin-type clay and mineralization 15% (No. С2) and 15.5% ( MCE + SASEG), and in experiments 27—

44 - clay of hydromica type and mineralization of 26% (CE) and 26.5 (1 \ 1АСЕ + САС! 2)

To one group of samples of drilling fluids, 35 FHLS are added as a viscosity reducer, to the other group - SPA.

When the clay concentration is less than 10%, the SNS value may significantly decrease.

four

(less than 19/23 EPA), which is not desirable when using this solution in the practice of drilling (experiment 5).

A clay concentration of more than 30% causes a decrease in the effectiveness of the action of the spa (experiments 43-44).

The concentration of SPA less than 0.1% does not provide a solution with high quality indicators (experiments 2, 13, 20, 28 and 36). The concentration of SPA more than 0.5% is not economically feasible (experiments 6, 17, 24, 32 and 40).

The drilling fluid maintains high quality under chlorine-sodium and polyvalent aggressions.

The use of drilling mud in field conditions reduces the cost of well construction and increases the efficiency of the drilling process. .

Claims (1)

Claim Mineralized clay drilling mud containing clay, mineralizer, viscosity reducer and water, characterized in that, in order to improve its filtration and structural-mechanical properties while preventing foaming, it contains a sulfate-containing superplasticizer based on sulphate-containing acrylate wastes with the following the ratio of ingredients, May. %: Clay Mineralizer Superplasticizer based sulphate-containing waste of acrylate production Water 10-30 10.5—26.5 0.1-0.5 Rest Experience ————— rest) Options drilling mud The composition of the solution wt.X .water - Clay IaS1 SAS1 _g SPA FHLS P, kg / m ³ HC, s SNS, /, o, f, cm ³ Pa pH g, Ζ one 2 ten ten ten ten 0.5 0.5 0.05 - 1135 1135 160 100 186/210 94/96 28 22 8.9 8.95 3 ten ten 0.5 0.1 - 1135 70 48/46 14 8.99 four ten ten 0.5 0.3 - 1135 40 24/28 ten 9.0 five ten ten 0.5 0.5 - 1135 28 19/23 9 9.2 6 ten ten 0.5 0.7 - 1135 26 19/21 9 9.0 7 ten ten 0.5 - 0.05 1130 160 180/189 22 8,8 0.44 eight ten ten 0.5 0.1 1118 140 165/189 ,eight 8.5 1.5 9 ten ten 0.5 - 0.3 1112 120 162/182 18 8.2 2.0 ten ten ten 0.5 - 0.5 1112 1 10 139/152 sixteen 8.0 2.0 eleven ten ten 0.5 0.7 1112 80 119/130 sixteen 7,8 2.0 12 20 15 - 1220 140 149/162 32 7,8 13 20 15 - 0.05 - 1220 .72 82/89 20 8.0 14 20 15 - 0.1 - 1220 42 24/29 13 8.9 15 20 15 - 0.3 - 1220 36 21/25 12  9.0 sixteen 20 15 - 0.5 - 1220 thirty 19/25 ten 9.2 17 20 15 - 0.7 - 1220 thirty 19/23 9.5 9.25 18 20 15 - 0.5 1180 102 116/122 22 7.5 3.2 nineteen 20 15 - - 0.7 1180 100 112/118 20 7.2 3.2 20 20 15 0.5 0.05 - 1220 78 86/92 20 8.0 21 20 15 0.5 0.1 - 1220 48 32/39 14 8.2 22 20 15 0.5 0.3 - 1220 40 26/31 12 8.3 1488297 6 five Continued table. Experience The composition of the solution, may.2 'water - the rest) Mud parameters Clay IAS1 SAS1g SNA FHLS P, kg / m ³ HC, with SNS, /, O, Pa F, cm * pH g, Ζ 23 20 15 0.5 0.5 1220 thirty 21/27 12 8.4 24 20 15 0.5 0.7 - 1220 28 21/25 11.5 8.45 25 20 15 0.5 0.5 1190 106 130/150 -20 7.45 2.5 26 20 15 0.5 - 0.7 1185 98 130/150 18 7.4 27 thirty 26 · - 1380 208 198/226 32 8.0 28 thirty 26 - 0.05 - 1385 98 82/90 22 8.05 29 thirty 26 - 0.1 - 1385 48 52/60 sixteen 8.2 thirty thirty 26 - 0.3 - 1385 40 30/36 14 8.25 31 thirty 26 - 0.5 - 1385 34 27/31 12 8.35 32 thirty 26 - 0.7 - 1385 32 25/29 12 8.35 33 thirty 26 - 0.5 1300 110 149/152 22 7,6 6.4 34 thirty 26 - - 0.7 1300 98 131/146 22 7.5 6.4 35 thirty 26 0.5 - - 1385 210 192/210 36 8.2 36 thirty 26 0.5 0.05 - 1385 120 98/128 20 8.25 37 thirty 26 0.5 0.1 - 1385 58 68/92 sixteen 8.3 38 thirty 26 0.5 0.3 - 1385 52 47/61 14 8.4 39 thirty 26 0.5 0.5 - 1385 50 39/60 12 8.5 40 thirty 26 0.5 0.7 - 1385 50 39/50 12 8.7 41 thirty 26 0.5 0.5 1295 139 160/189 22 7.45 6.5 42 thirty 26 0.5 - 0.7 1290 119 151/190 20 7.4 6.5 43 35 26 0.5 0.3 1410 89 82/115 ten 8.25 44 35 26 0.5 0.5 - 1400 80 80/98 ten 8.30 Note. Р - density ^ СНС - static shear stress; HC - conditional viscosity; F - filtration rate; pH is a pH value; G - gas content.