RU1776688C - Drilling mud - Google Patents

Abstract

Usage: drilling oil and gas wells. SUBSTANCE: drilling fluid contains, wt.%: Clay 8-40, glycerol production waste at the final stage 0.109-0.810, stabilizer reagent 0.5-2.0, superplasticizer-1 40-03-0.036-0.270, water - the rest. Superplasticizer-1 40-03 is based on modified sodium salts of oligomeric petroleum acids, which is a sodium hydroxide-neutralized product of condensation of sulfonated aromatic hydrocarbons from gas oil fractions of catalytic cracking and pyrolysis of oil with formalin. 1 tab.

Description

The invention relates to the drilling of oil and gas wells, in particular to the chemical treatment of drilling fluids for drilling wells.

Known drilling fluid containing as a diluent FHLS, KSSB, nitroglycerin (1). However, these solutions are ineffective, especially when drilling soft clay deposits.

Also known drilling mud (2), containing, wt.%.

Clay28-40

Organic reagent stabilizer 0.3-2.0

Wasting of glycerol production at the final stage 0.25-3.00 Water Remaining However, when drilling easily dispersible and highly swelling clay deposits, this drilling fluid is not sufficiently effective% since the structural and mechanical properties of the drilling fluid are overestimated.

The goal is to reduce the structural and mechanical properties of the drilling fluid.

This goal is achieved in that the drilling fluid, including clay, an organic stabilizing reagent, waste glycerol production at the final stage and water, additionally contains superplasticizer-1 40-03 based on modified sodium salts of oligomeric petroleum acids in the following ratio of ingredients, May%

With

with

-h

Xi

oh oh

00 00

Clay

Organic reagent-stabilizer. Glycerol production waste at the final stage. Superplasticizer-1

8 -40 0.5-20

0.109-0810

40-03 based on modified sodium

salts of oligomeric petroleum acids 0.036 - 0.270

Water Else

Glycerol production waste (OPG) is obtained according to procedure (2). The MONS reagent (modified sodium salts of oligomeric petroleum sulfonic acids) is produced according to TU 100-01-90. It is obtained by sulfonation of aromatic hydrocarbons of gas-oil fractions of catalytic cracking and oil pyrolysis, followed by condensation with formalin and activation of sodium ligno-sulfonate (LST) grade B, previously neutralized with sodium hydroxide.

In order to obtain comparative data, a hydrated hydromica clay feed stock was prepared. Part of the solution was treated with a stabilizer - in our case, CMC.

Before the introduction of OPG and the modified sodium salt of oligomeric petroleum sulfonic acid (MONS) into the drilling mud, they are pre-mixed.

PRI me R. a) 601 g of CMC, 4.5 g of OPG with a density of 1280 kg / m, 1.5 g of MONS and 378 g of clay were added to 601 cm3 of water, b) 15 g of CMC, 6 g of OPG with a density of 1280 kg / were added to 601 cm3 of water m3 and 378 g of clay.

After stirring to the next state, the solution is suitable for use.

In accordance with this example, various compositions of drilling fluids are prepared, the properties of which are given in table. 1.2.

The experiments showed that the optimal concentration of the reagent in the drilling fluid ranges from 0.145-1.08 wt.%. As can be seen from the table. 1 at a concentration below the optimum (solution 2), the initial parameters of the drilling fluid are insignificant, and an increase in the concentration has no significant effect (solution 5, 12.19).

The experiments showed that the effectiveness of the new reagent to reduce the structural and mechanical properties of clay Salt solution is much better than

known reagent - OPG. This regularity is maintained when the clay phase content and its composition change (see Table 1). The pH of the starting reagent is 11.8-12.8, non-toxic. Prepare it at the factory or directly at the rig.

Application of the proposed drilling

solution while drilling oil and gas

wells improves working conditions, prevents environmental pollution,

reduces overhead

calendar time, allows you to save

a lot of material and labor resources,

which improves economic performance

drilling.

Claims (1)

SUMMARY OF THE INVENTION A drilling fluid comprising clay, an organic stabilizing reagent, a waste of glycerol production at the final stage and water, characterized in that, in order to reduce its structural and mechanical parameters, it additionally contains superplasticizer-1 40-03 based on modified sodium - oligomeric petroleum acid neutralized with sodium hydroxide product of condensation of sulfonated aromatic hydrocarbons of gas oil fractions of catalytic cracking and pyrolysis of oil with formalin, with the following ratio of ingredients, wt.%: clay 8-40 organic reagent-stabilizer 0.5-2.0 production waste glycerol at the final stage 0.109-0.810 superplasticizer-1 40-03 based on modified sodium salts of oligomeric petroleum acids, neutralized with sodium hydroxide condensation product of sulfonated aromatic hydrocarbons of gas oil fractions of catalytic cracking and oil pyrolysis with formalin 0.036-0.270 water rest.