SU952942A1 - Method for cleaning slime produced in drilling wells with hydrocarbon-based drilling muds - Google Patents

Description

The invention relates to the oil and gas industry, in particular to an improved method for cleaning sludges obtained during drilling of wells with hydrocarbon-based solutions.

A known method of cleaning sludge obtained during drilling wells with oil-based solutions from hydrocarbons by treating it with a detergent composition, including ethylene glycol alcohols and paraffin hydrocarbons in a volume ratio of from 10:90 to 80:20. The resulting mixture of oil and solvent on the sludge particles is removed by centrifugation or washing with water [1].

The disadvantage of this method is that it uses scarce, multicomponent and expensive reagent, you (ethylene glycol and paraffin hydrocarbons), the degree of purification of the sludge is not provided due to the fact that the oil film is not completely removed from the surface of the sludge during washing with water and centrifugation, as well as not solved the problem of reuse of the solvent, after removing oil from it.

HYDROCARBON-BASED

The closest to the proposed technical essence and the achieved result is a method for cleaning sludge obtained when drilling wells with hydrocarbon-based solutions by treating it with diesel fuel and a surface-active substance (ML-72), including 65-70 wt.% Alkyl sulfonate with 12-18 carbon'atoms in the alkyl radical, 25-27 wt.% Alkylaryl sulfonate with a linear alkyl radical containing 8-11 carbon atoms, 5-8 wt.% Polyethylene glycol ether of ditretic butylphenol, at 70-80 ° C [21.

The disadvantage of this method is the 2 stages, the relative duration of the process (6-10 min) and the inapplicability of this method for cleaning the sludge obtained by drilling chemogenic deposits.

The purpose of the invention is to reduce the duration of the process and provide the possibility of cleaning the sludge obtained during the drilling of chemogenic deposits. ,

This goal is achieved in that the treatment is carried out simultaneously, but with fuel, a surfactant in an ultrasonic field with an oscillation frequency of 15-35 kHz, and as a surfactant, an emulsion is used in the amount of 0.1-0.2 weight .% of the total amount of diesel fuel.

Emultal is an ester of oleic, linoleic, linolenic, resin acids and triethanolamine. -18

The method is carried out in a closed loop.

The sludge separated from the drilling fluid through a sieve is fed through a sludge collector to a receiver, where 15 it is treated with diesel fuel with 0.1-0.2% of E1 ultal in an ultrasonic field with an oscillation frequency of 15-35 kHz. 5-10 s in a weight ratio of sludge to diesel fuel 1: 5-20

10. Then the sludge enters the BC-1 vibrating screen and is discharged into the sludge tank. In this case, hydrocarbons are washed to a residual content of 2–3 wt.% Against 17–20% of the initial 25 sludge.

PRI me R 1. Take slots containing 17 wt.% Solution on a hydrocarbon basis, in an amount of 10 portions of 2 g each, process simultaneously 100 ml of diesel fuel with 0.2% emulsion in a ratio of 1:10 at room temperature temperature for 5 s in an ultrasonic field with an oscillation frequency of 35 kHz. The hydrocarbon content after processing is 2 wt.%.

Example 2. The experiment is carried out according to example 1, however, diesel fuel with 0.1% emulsion is introduced in a ratio of 1: 5 in an ultra-40 ultrasonic field with an oscillation frequency of 15 kHz. The residual carbon content. hydrogens is 3 wt.%.

Example 3 (control) is carried out according to the known method 45. Take the sludge obtained after drilling in chemogenic deposits, containing 17 wt.% Hydrocarbons, in the amount of 10 portions of 20 g each, sequentially treat 200 ml of 50 diesel fuel in a ratio of 1: 7 at room temperature. The hydrocarbon content after treatment with diesel fuel is 12% by weight. G Then the washed sludge is further treated with 200 ml '55

1% aqueous solution of ML-72 in a ratio of 1:14 at 70 ° C. The residual hydrocarbon content is 9 wt.%.

PRI me R 4. Take the slurry obtained after drilling in chemogenic deposits containing 17 wt.% Hydrocarbons and treated according to example 1. The percentage of residual hydrocarbons is 3 wt.%.

As can be seen from the presented examples, the proposed method can significantly reduce the duration of the process from 6-10 minutes to

5-10 min to 5-10 s. Simplify the technology by eliminating the 2 stages. Distribute this method for cleaning sludge obtained during the drilling of any rock. In addition, the proposed method allows the use of diesel fuel with the addition of emulsion for the preparation of hydrocarbon-based solutions. The washed sludge can be buried without damage to crops or used in the construction of roads.

Claims (1)

Claim The method of cleaning the sludge obtained by drilling wells with hydrocarbon-based solutions by treating it with diesel fuel and surfactant, characterized in that, in order to shorten the process time and ensure the possibility of cleaning the sludge obtained by drilling chemogenic deposits, the treatment is carried out simultaneously with diesel fuel and a surfactant in an ultrasonic field with an oscillation frequency of 15-35 kHz, and emultal is used as a surfactant in the amount of 0, Ο, 2 wt.% Of. total amount of diesel fuel.