SU751824A1 - Drilling mud - Google Patents

Description

The invention relates to the field of drilling oil and gas wells, namely drilling mud.

Known drilling mud containing clay, the fluid loss reducer (CMC, Hypan, Metas, KSSB) and water 1.

The disadvantage of these drilling fluids is their thickening at 80 ° C.

Drilling muds are known, containing clay, a water loss reducer, an alkalinity regulator, a viscosity reducer (PRS, oxil, FHLS) and water 2.

The disadvantage of these drilling fluids is the thermal stability limit of 100-200 ° C, at higher temperatures these muds thicken.

The aim of the invention is to reduce the viscosity of the solution under conditions of positive temperatures up to 250 ° C.

This goal is achieved by the fact that, as a viscosity reducer, the solution contains polysulfomethylene phenol t srp - polymer GRP-31 at the following ratio of ingredients,; wt. %:

Clay8-12

Water loss reducer0,3-0,5

Polysulfomethylene phenol t

sodium-polymer VRP-31 0.3-0.5

Alkalinity regulator, for example caustic soda 0.1-0.2

WaterEverything

As a water loss reducer, the solution contains CMC or metas or hypan.

The use of GRP-31 in combination with reagents that reduce / and water loss, provides the necessary structural-mechanical and rheological parameters of the drilling fluid, which allow carrying out well drilling in difficult geological conditions in the presence of high positive temperatures and pressures. .

The surfactant VRP-3 is a nontoxic liquid of dark brown color 15 with a density of 1.25 g1 cm and a molecular weight of 10-12-10

GRP-31 is produced by the Fergana hydrolysis plant for furan compounds of 20 TU-0276.

The use of GRP-31 as a diluent allows maintaining the structural and mechanic characteristics of the drilling fluid in the optimal range of up to 250 ° C and obtaining the maximum dilution effect with minimal diluent costs both at normal and at high temperatures. In some cases, if there are diluents with insufficient liquefying ability in drilling (for example, oxyl, sunyl, PRS, OSSB, FHLS) to increase their effectiveness. S conditions of high bottomhole temperatures, as well as decrease in foaming capacity of polymer drilling mud GRP-31 can be used in a ratio of 1: 10 and 1: 20.

The advantage of this drilling mud is in its stability and its resistance to high downhole temperatures (up to 250 °). The economic efficiency of its use is made up of the following indicators: reducing the consumption of chemical reagents and materials; prevention of complications associated with indentations, tool stickings and barrel workouts; reduce the time of construction of high temperature wells.

Claims (2)

1. A drilling fluid containing clay, a water loss reducer, a viscosity agent, an alkalinity regulator, such as caustic soda, and water, characterized in that, in order to reduce the viscosity of the solution under conditions of positive temperatures to 250 ° C, as a reducing agent viscosity it contains sodium polysulfomethylene phenol t-polymer GRP-31 with the following ratio of ingredients, May. %: Clay8-12 Water loss reducer0,3-0,5 Polysulfomethylenefeiol t sodium-polymer VRP-31 0.3-0.5 Alkalinity regulator, caustic soda 0.1-0.2 Water Rest 2. A solution of p. 1, characterized in that it contains carboxymethyl cellulose or metas or hypan as a water loss reducer. Sources of information taken into account in the examination: 1. Kister E. G. Chemical treatment of drilling fluids. M., “Nedra, 1972, p. 193. 2. Kister E. G. Chemical treatment of drilling fluids. M., “Nedra, 1972, p. 152.