RU2391376C1 - Method of processing drilling fluid - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to oil extraction industry and can be used in processing water-based drilling fluid. In the method of processing drilling fluid, the drilling fluid is mixed with an additive in amount of the additive of 0.3-0.6 % of the volume of the drilling fluid continuously while circulating the drilling fluid with a jet into the stream of drilling fluid or through a measuring connection pipe on the suction line of a drill pump in a pumping unit. The additive used is a mixture of purified spent oil and Sinol EM emulsifying agent in ratio of 55-65 and 35-45% respectively.

EFFECT: design of an efficient method of processing drilling fluid.

3 ex

Description

The invention relates to the oil industry and may find application in the processing of a drilling fluid based on water.

Known lubricant additive for water-based drilling fluids, including, wt.%: The condensation product of monoethanolamine and crude taly oils 10-30, kerosene 5-10, monoethanolamine 1.0-1.5, flotation reagent oxal - the rest (copyright certificate of the USSR No. 1749226, C09K 7/02, published. 07.23.1992).

Known additive has low lubricating and anti-seizing properties of the drilling fluid.

Closest to the proposed invention in technical essence is a lubricant additive for water-based drilling fluids, including kerosene 5-10, an oil-soluble surfactant - the product of the interaction of boric acid, diethanolamine and a mixture of fatty acids of the limit and unsaturated series with the hydrocarbon radical C ₈ - C ₂₄ 20-30, polyglycol 50-65, kerosene 5-10 and isobutanol 7-10. The drilling fluid is treated with a lubricant additive in an amount of 0.5-1.0 wt.% (RF Patent No. 2236431, published. 09/20/2004 - prototype).

Known additive gives the drilling fluid insufficiently high lubricating and anti-seizing properties.

The proposed invention solves the problem of increasing the lubricating and anti-seizing properties of the drilling fluid.

The problem is solved in that in a method for processing a drilling fluid, comprising combining an additive and a drilling fluid, according to the invention, combining an additive and a drilling fluid is carried out in an amount of 0.3-0.6% of the additive from the volume of the drilling fluid continuously in the process of circulating the drilling fluid with a jet into the stream drilling fluid or through a dosing pipe on the suction line of the mud pump in the pump unit, while a mixture of purified waste oil and Sinol EM emulsifier is used as an additive in their volume ratio respectively (55-65) / (35-45)%.

SUMMARY OF THE INVENTION

Currently, commercial oil is used in industry for processing clay solutions. The use of marketable oil is due to the need to give the clay solution lubricating properties to eliminate sticking of the drilling tool. In accordance with the technology of preparation and use of clay solutions, the amount of added oil to provide the required lubricating properties is up to 10-15%. In this case, the processing of the solution is carried out under drilling conditions, which leads to a change in the operational parameters of the clay solution (viscosity, density, etc.) and additional time spent to bring them to the required values. Processing the solution in the conditions of the mortar nodes is not performed due to the increased fire hazard of the oil.

It should be noted that in many oil regions the use of oil as a reagent for processing clay solutions is prohibited, which is associated with the need to improve environmental safety. In addition, oil treatment in a drilling environment increases the likelihood of fires.

To increase the lubricating and anti-seizing properties of the drilling fluid, an additive and a method for processing drilling fluid are proposed, according to which the combination of the additive and the drilling fluid is produced in an amount of 0.3-0.6% of the additive of the drilling fluid volume continuously during the circulation of the drilling fluid with a stream into the drilling mud stream or through a dosing pipe on the suction line of the mud pump in the pump unit. As an additive, a mixture of purified spent oil and Sinol EM emulsifier is used with their volume ratio respectively (55-65) / (35-45)%.

Refined waste oil is used according to TU 39-0147585-065-00 of the type TN-12, TN-20, TN-30, TN-40, etc. The oil has a kinematic viscosity at 50 ° C from 10 to 45 mm ² / s (cSt), a flash point in an open crucible from 120 to 150 ° C, an ash content of not more than 0.3%, a mass fraction of solids of not more than 0.05% .

Emulsifier Sinol EM is used according to TU 2413-048-48482528-98. Emulsifier Sinol EM is a 40% solution of esters of higher unsaturated fatty acids (linoleic, oleic, linolenic, etc.) and resin acids in winter diesel fuel with the addition of a high molecular weight organic thermal stabilizer and ~ 2% alkyldimethylamine oxide. In appearance, it is an oily viscous liquid from light brown to black (sediment is allowed) with an acid number of 2 to 4 mg KOH / g and a pour point of no higher than minus 35 ° C.

To obtain an additive, purified refined oil and Sinol EM emulsifier are mixed in a volume ratio of respectively (55-65) / (35-45)%. The mixture is an oily mobile liquid from light brown to dark brown, with a density of 820 to 1200 kg / m ³ , a flash point in an open crucible from 50 to 80 ° C.

The application of the proposed technical solution increases environmental safety, since the required amount is less than 1% (oil addition is 10-15% of the volume of the drilling fluid), reduces the potential risk of fires due to the fact that the additive is a low-combustible fluid.

In addition, at prevailing commodity oil prices, the use of a lubricant based on used oils will reduce the annual cost of processing a drilling fluid by 20-25 million rubles. (with an estimated cost of the additive 30-35 thousand rubles / t), while reducing transportation costs for oil delivery to the drilling rigs by at least 20 times.

Case Studies

Example 1. For drilling an oil well using clay water drilling mud with a density of 1.12 g / cm ³ in the amount of 200 m ³ . As an additive, a mixture of purified waste oil and Sinol EM emulsifier is used with their volume ratio of 55/45%, respectively. The additive is used in an amount of 0.3% of the volume of the drilling fluid, i.e. 0.6 m ³ . The combination of additives and drilling fluid is carried out continuously during the circulation of the drilling fluid stream into the flow of the drilling fluid.

Example 2. Perform, as example 1. As an additive, use a mixture of purified waste oil and emulsifier Sinol EM at a volume ratio of 60/40%, respectively. The additive is used in an amount of 0.45% of the volume of the drilling fluid, i.e. 0.9 m ³ . The combination of additives and drilling fluid is carried out continuously during the circulation of the drilling fluid stream into the flow of the drilling fluid.

Example 3. Perform, as example 1. As an additive, use a mixture of purified waste oil and emulsifier Sinol EM at a volume ratio of 65/45%, respectively. The additive is used in an amount of 0.6% of the volume of the drilling fluid, i.e. 1.2 m ³ . The combination of the additive and the drilling fluid is carried out continuously during the circulation of the drilling fluid by a jet through the dosing pipe on the suction line of the mud pump in the pump unit.

As a result of tests at the drilling site during drilling of 5 wells, not a single case of sticking of the drilling tool or a significant increase in the load on the rotor of the drilling machine was revealed, which indicates a sufficiently high lubricating and anti-seizing properties. At the same time, tests of the prototype additives showed the presence of complications when drilling up to 20% of wells.

The application of the proposed method will give the drilling fluid high lubricating and anti-seizing properties.

Claims (1)

A method of processing a drilling fluid, comprising combining an additive and a drilling fluid, characterized in that the combination of an additive and a drilling fluid is produced in an amount of 0.3-0.6% of the additive from the volume of the drilling fluid continuously in the process of circulating the drilling fluid with a stream into the mud stream or through dosing pipe on the suction line of the mud pump in the pump unit, while a mixture of purified waste oil and Sinol EM emulsifier is used as an additive with their ratio, respectively (55-65) / (35-45)%.