SU1680752A1 - Drilling mud - Google Patents

Abstract

The invention relates to the drilling of wells, in particular to the composition of water-based drilling fluids with improved filtration and rheological properties. The purpose of the invention is to reduce the filtration structural, mechanical and rheological parameters of the drilling fluid. The drilling fluid contains clay, the reagent is a stabilizer and a regulator of structural-mechanical and rheological properties, a preventive lubricant additive is unstabilized oil, and the surfactant is sulfonol and water. Carboxymethylcellulose (CMC) modified by cellogum humates is used as a stabilizer and regulator of the structural-mechanical and rheological properties of drilling mud. The ratio of components in solution is as follows, wt%: clay 8-12; CMC, modified by cellulose humates, 0.1 - 0.3; oil 5-10; sulfonic acid, 0.015-0.03; water the rest. The drilling fluid reduces the consumption and range of chemicals for treating drilling fluids. When used in drilling, drilling mud increases by 5 to 10% of the mechanical drilling rate and penetration rate by one bit. 2 tab. 1C

Description

The invention relates to the oil industry, namely to water-based drilling fluids.

The purpose of the invention is to reduce the filtration, structural-mechanical and rheological parameters of the drilling fluid.

Drilling mud, including clay, oil, CMC, sulfonic acid and water, contains CMC modified as humes of cellogum brand as the CMC, in the following ratio of ingredients, wt.%;

Clay8-12

CMC, modified humates0.1 - 0.3

Oil 5-10

Surface-active substance (surfactant) 0,015-0,03

WaterEverything

Modified carboxymethylcellulose is a product of the interaction of alkaline cellulose, monochloroacetic acid or its sodium salt and carbon alkaline reagent and acts as a filtration reducer, rheology 00

about

The structural and mechanical properties of the solution are manufactured in accordance with Specifications 6-55-221-1009-88 in the form of a powder from gray to brown.

As a lubricating and prophylactic additive use unstabilized oil with a surfactant - sulfonol.

The drilling mud is prepared on the basis of the drilled clays of the geological section and fresh water.

Under laboratory conditions, solutions are prepared as follows.

With continuous stirring in a laboratory mixer, clay slurry, previously hydrated and dispersed, is added to the water, stirring is continued for 30 minutes. Then, modified CMC and oil are introduced with the sulfonol previously dissolved in it and the solution is stirred for another 20-30 minutes. Parameters were measured on instruments: density — pycnometer, conventional viscosity — SPV-5, static shear stress — CHC-2, filtration rate — VM-6, plastic viscosity, and dynamic shear stress BCH-3.

Example 1. Drilling fluid contains, wt%:

Clay8

CMC, modified humates 0,1

Oil5

Sulfonol (surfactant) 0.015

WaterEverything

Example 2. Drilling mud with a maximum ratio of components, wt.%:

Clay12

CMC, modified humate0,3

Oil10

Sulfonol (surfactant) 0.03

WaterEverything

Example 3. Drilling pacieop at the optimum ratio of components wt.%:

Clay10

CMC, modified humates0.2

Oil7

Sulfonol (surfactant) 0.021

WaterEverything

The parameters of drilling fluids are given in Table 1.

Example 4. Drilling fluid contains, wt%:

Clay5

CMC, modified humatemOO 05

Oil3

Surfactant (sulfonic acid) O.OB

WaterEverything

Example 5. Drilling fluid contains, wt%:

Clay15

CMC, modified humates0.4

Oil12

0PAV (sulfonol) 0.036

WaterEverything

From tab. 1, it follows that the use of CMC modified with humates allows obtaining a drilling mud with improved rheological, structural-mechanical and filtration properties with minimal consumption and assortment of chemical reagents.

This drilling mud can be used to stabilize both fresh and mineralized solutions up to saturation of NaCl at temperatures up to 160 ° C, and CMC modified with humates up to 180 ° C. At the same time, their additives increase from 5 1, 5 to 3.0%, depending on the degree of mineralization.

For the studies, two samples of the solution with the content of bentonite clay 57 °, mineralized with sodium chloride in an amount of 26%, were prepared.

CMC-600 is introduced into the first sample as a stabilizer, and CMC modified with humates (CMC-cellogum) in quantities of 3% by weight are introduced into the second sample. The prepared solutions are heated at 180 ° C for 8 hours. Filtration is determined before heating at 120 ° C, after heating and during thermostating at a temperature of 180 ° C and a pressure drop of 40 atm 0 (Table 2).

The results are shown in Table. 2

Research results confirm that CMC reagent modified with 5 (mats used as a stabilizer in the proposed solution is more effective in mineralized drilling fluids compared with CMC-600.

Claims (1)

The use of this drilling fluid reduces the flow rate and range of chemicals for treating drilling fluids, and also increases the mechanical drilling rate and penetration by one bit by 5–10% due to the improved 5 rheological and structural-mechanical properties of the drilling mud. The claims of the drilling fluid, including clay, oil, CMC, sulfonol and water, are distinguished by the fact that, in order to reduce filtration, structural-mechanical and rheological parameters of the drilling mud, CMC modified with huts of the cellogum grade with the following ratios of ingredients, wt.%: Clay8-12 CMC, modified by brand humates OD cellogum - 0.3 Oil 5-10 Sulfonol 0,015-0,03 WaterEverything Table 1 Formulation without barite., For the preparation of solutions, a well-built well with a well is used. 5% solution bentonite, 26% NaCl, 3% KMN-6005,5 25 5% solution bentonite, 26% NaCl, 3% CMC, modified gum tami3,54,5 Table 2 I78 26