SU1601102A1 - Water-base drilling mud - Google Patents

Abstract

The invention relates to the drilling of oil and gas wells and is intended for flushing the wellbore. The goal is to improve the quality of the drilling fluid by preventing the thermal flocculation of the solid phase of the mud. It contains the following ingredients with their ratio, wt.%: Clay 20-30, organic reagent-stabilizer 1-3, salt of carboxylic acid and alkali metal 0.5-3.0, water - the rest. This solution is prepared by thoroughly mixing the ingredients within it. The presence of a salt of a carboxylic acid and an alkali metal in the solution prevents flocculation of the solid phase of drilling fluids. 1 tab.

Description

The invention relates to the drilling of oil and gas wells, in particular to the washing of a well bore.

The purpose of the invention is to improve the quality of the drilling fluid by preventing its thermal flocculation.

The drilling fluid contains clay, organic reagent-stabilizer, salt of carboxylic acid and alkali metal and water in the following ratio of ingredients, wt .: Clay 20-30 Organic reagent-stabilizer 1-3 Salt of carboxylic acid and alkaline

metal 0.5-3.0 Water Rest containing these acids, for example, acetic acid production waste, containing 50% acetic acid and S0% hydroquinone.

The table presents data illustrating the dependence of the technological parameters of the drilling fluid on its qualitative and quantitative composition.

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: Example 1. In 1000 g of the clay suspension, 10 g of CMC-PSO are introduced and mixed thoroughly. After stabilization of the technological parameters, 100. g of sodium hydroxide acetic acid neutralized to pH 7-8 (test 5) are introduced. Example 2. In 1000 g of clay suspension, 30 g of carbon alkaline reagent are injected and thoroughly mixed ; 10 g of potassium acetate are then added (Run 6).

Example 3. In 1000 g of clay suspension, 10 g of CMC-VO are introduced, stirred and 10 g of powdered oxalic acid are added after 10-15 minutes of mixing with 5 g of sodium hydroxide.

The drilling muds obtained in this way are evaluated on standard instruments. After that, they are heated up to 220 ° C on the instrument (heating is left for 1 hour) and filtered at temperature. After the solution has cooled down to 40-80 ° C, it is poured out of the device and set to cool, assessing the stability and taking parameters at normal temperature.

The presence of a carboxylic acid salt and an alkali metal prevents flocculation of the solid phase of drilling fluids at a temperature.

F o rm y, l and

and 3

gaining

A water-based drilling fluid comprising clay, an organic stabilizer reagent and a water-soluble carboxylic acid salt, characterized in that, in order to improve its quality by preventing the thermo-flocculation of the solid phase of the drilling fluid, it contains salt as a water-soluble carboxylic acid salt. carboxylic acid and alkali metal in the following-Shch6M ratio of ingredients, May .: Clay 20-30

Organic stabilizer reagent

The salt of carboxylic acid and alkali metal 0.5-3.0 Water Rest

Claims (1)

Claim A drilling fluid based on water, including clay, an organic stabilizing reagent and a water-soluble salt of a carboxylic acid, is such that, in order to improve its quality by preventing thermal flocculation of the solid phase of the drilling fluid, it is a water-soluble salt carboxylic acid contains a salt of a carboxylic acid and an alkali metal with the following ratio of ingredients, wt.%: Clay 20-30 Organic stabilizer reagent 1-3 25 Salt of carboxylic acid and alkali metal ‘0.5-3.0 Water Else Experience Drilling fluid composition Properties of drilling fluids before heating Mud properties after warming up at 220 C (1 h) '2 VA MPa * s A dpa 1 9, / 9 ,,, j dPa R ² "CM ³ P ² CM ³ > j MPa s j dpa | in, is, | dpa 1 cm ³ 1 OTC% 1 20% clay slurry (30% bentonite + 10% kaolin) thirty 135 179/212 10 fifty Solution exfoliates - 2 Solution 1 + +% KMTs-700 35 90 116/126 8 61 Solution exfoliates - 3 Solution G + 3% USR 3 thirty 6/9 14 54 thirty 22 87/97 36 24 4 Solution 1 + 3 £ KSSB-4 fifteen 67 58/86 7 38 Solution exfoliates - 5 Solution 1 + 12 CMC +> 2 NAA 28 88 106/108 7 24 25 33 34/42 8 2 6 Solution 1 + 32 USCHR + U UKN 12 14 12/18 8 14 24 20 . 45/45 8 4 Ί Solution 1 + 32 KSSB + 12 UKK thirteen 55 32/34 5 18 • fifteen 45 36/38 6 0 8 Solution‘2 + 0.5% UKN 63 102 skirt / 11? 7 35 thirty 86 90/97 18 8 9 Solution 2 + 1% UKN 40 115 95/112 ; 10 21 52 78/91 8 4 10 Solution 2 + 32 UKN 12 . 28 14/20 6 fifteen 10 12 15/24 8 0 eleven Solution 2 + C, 252 UKN . 36 100 120/131 8 48 42 98 90/112 10 12 12 Solution 2 + 4.02 UKN 8 10 2/4 12 99 Solution exfoliates - thirteen Solution 2 + 12 ShKK + Ό. 52 NaOH 23 82 101/106 7 26 fifteen 24 49/56 8 .8 14 Solution 2 + 1% VK + 0.5% NaOH 20 71 91/98 7 21 10 12 21/34 12 10 fifteen Solution 2 + 1% Ka ₄ SiO ₃ 25 85 92/104 7 31 21 74 90/98 16 27 16 Solution 1 + 25% NaCl Immeasurably high 40 - - - - - 17 Solution 16 + 12 KMTs-700, 7 24 58/79 thirty 135 Solution exfoliates - - 18 Solution 17 ♦ 12 UKN 6 19 45/56 8 12 5 8 22/34 eleven 2 19 Solution 16 ♦ 22 MK-1 68 ' 105 180/216 6 150 Solution exfoliates - 20 Solution 19 + 1% UKN 35 61  100/126 6 35 28 42 36/38 7 5 21 Solution 2 + 1% LEU 26 74 94/103 6 33 -26 36 31/35 8 6 22 30% clay slurry (20% kaolin + 10% bentonite) + 2% -MgCl- Immeasurably high - - - - - * 23 Solution 22 + 12 KMTs-700 40 160 250/310 7 35 Thickened to netekukego state 24 Solution 23 + 2% UKK 31 84 145 / 1B6 6 12 23 51 47/54 8 2 25 Solution 23 + 2% Acetic Acid Calcium 31 192 190/201 7 17 34 03 59/72 10 8 Note. plastic viscosity: C, - dynamic shear stress; OTS - sediment in 24 hours; 9-, / in „- static • shear stress; Ρξϊ ⁵ - filtration for 30 iin, respectively, at 20 and 220'C; NAA - neutralized acetic acid up to 7-8; UKN - acetic acid nat; m; UKK - acetic acid potassium; Central Committee - tsavelevy acid · lot; VK - tartaric acid; Zh-1 - modified starch; NOUK - neutralized waste of acetic acid.