SU857630A1 - Method of transporting oil - Google Patents

Description

(54) OIL TRANSPORTATION METHOD

one

The method relates to the oil industry, in particular to the technology of transporting oil containing hydrogen sulfide.

Methods are known for transporting oil containing hydrogen sulfide, based on separate transportation of Devonian oil (not containing hydrogen sulfide) and coal-bearing oil (containing hydrogen sulfide). In this case, hydrogen sulfide oil is stepwise degassed, and hydrogen sulfide gas is burned in flares 1.

However, the separate method of transporting oils containing and not containing hydrogen sulfide is associated with large gas losses and poisoning of the surrounding nature.

In addition, the implementation of this method requires high material costs for the construction and operation of two independent collection systems, transport and oil preparation.

The closest technical solution is the method 2 of transporting oil, including the preliminary separation of hydrogen sulfide from coal-bearing oil by deep separation of associated gas from it.

containing hydrogen sulfide up to 5 kg / 100 nm on group or booster installations and its subsequent mixing with Devonian oil not containing hydrogen sulfide. The volume ratio of coal and Devonian oils in the mixture is 1: 1.

The disadvantage of this method is the high material costs of transporting the oil mixture, since after separation of the hydrogen sulfide-containing (coal-bearing) oil and produced water, residual dissolved hydrogen sulfide is contained, resulting in gas losses during oil transportation, corrosion of field communications and equipment, and environmental poisoning.

The purpose of the invention is to reduce the material costs of transporting hydrogen sulfide oil through the pipeline.

Claims (3)

The goal is achieved by the fact that in a method involving the displacement of oils and separation of associated gas, hydrogen sulfide-containing oil is shifted with watered oil containing iron ions in the aqueous phase at the rate of 0.6-2.3 g per gram of neutralized hydrogen sulfide, and separation of associated gas carried out from a mixture of oils. In some cases, hydrogen sulfide oil can be mixed with water containing iron ions within the specified limits. The average concentration of hydrogen sulfide in the liquid and gaseous phases of the production of coal-bearing wells is as follows. In oil 80 g / mz, in water 300 g / m in gas 45 g / m. Some reservoir waters of the Devonian horizon contain from 30 mg / l to 200 mg / l iron ions. Neutralization of hydrogen sulfide with iron ions proceeds according to the following reaction: Hj.S - f Fe FeS + 2Ht The theoretical volume of Devonian water (containing X mg / l of iron ions) needed to neutralize the H. mg / l hydrogen sulfide is determined from the ratio Xa- 55, 85. g Xg MFeGL X, -, Xi MHzS where Mce is the molecular weight of divalent MWiS iron and hydrogen sulfide, respectively; Q is the volume of carbonated hydrogen sulfide oil. Accordingly, taking into account the initial content of hydrogen sulphide in carbonated carbonaceous oil and iron ions in Devonian water, carbonated carbonated oil treated with demulsifier reagent is biased with a Devonian oil-oil emulsion containing iron ions in the aqueous phase and the mixture is transported in a turbulent mode at Re-H-3310 pipeline to the point of separation. With vigorous stirring of the transported oil mixture, the neutralization reaction of hydrogen sulfide with iron ions proceeds in a matter of seconds. If there is water containing iron ions in the production sites of hydrogen sulfide oil, it is mixed with the flow of this water and transported to the separation point. According to the given reaction per gram of neutralized hydrogen sulfide, it is necessary to have in water 1.643 grams of iron ions:. 55.85- 643 Example. From wells operating at the booster pumping station (NGDU Elkhovneft) are selected in sealed samplers for 1 liter of Devonian oil with an average density of 0.8730 kg / m and a water content of 45-50%. Moreover, the amount of iron ions in the formation water of oil samples taken from various wells is 20-160 mg / l. 0.1 l of hydrogen sulfide-containing oil with a core water content of 12 / o is metered into selected samples of Devonian oil. The content of hydrogen sulfide in one liter of carbonated hydrogen sulfide-containing oil is on average 300 mg / l. The theoretical volume of Devonian water required for the complete neutralization of hydrogen sulfide is calculated by the formula. After mixing the oil mixture, oil transportation through the pipeline is simulated by swinging on a laboratory shaker for 15-20 minutes, with the number of swings 60 per minute. After simulating the transportation of the mixture of diesel engines, the gas is separated from it and the residual content of hydrogen sulfide in gas, oil and water is determined at different concentrations of iron ions in Devonian water. As a result, when the content of iron ions in the formation water is from 0.66 to 2.32 per gram of neutralized hydrogen sulfide, its total content in gas, oil and water is in the order of 4-15 mg / l versus 300 mg / l before mixing and joint transportation of oil, which fully meets the requirements of safety of maintenance of facilities and environmental protection. The maximum amount of neutralized hydrogen sulfide within these limits is 284-295 mg / L. Using the proposed method of transporting oil allows reducing the material costs of building collection systems by 50%, significantly improving environmental conditions, engaging coal-bearing horizons in processing, and reducing corrosion of oilfield equipment. Claim 1. The method of transporting oil containing hydrogen sulphide through a pipeline, including mixing oil, and separation of associated gas, characterized in that, in order to reduce material costs, hydrogen sulphide-containing oil is shifted with watered oil containing iron ions in the aqueous phase, and separation associated gas is carried out from a mixture of oils. 2. A method according to claim 1, characterized in that watered oil containing in the aqueous phase iron ions at the rate of 0.6-2.3 g per gram of neutralized hydrogen sulfide is introduced for mixing. 3. A method of transporting oil containing hydrogen sulphide through a pipeline, including displacing oil and separating associated gas, characterized in that, in order to reduce material costs, hydrogen sulphide-containing oil is mixed with water containing iron ions. 5857630 Sources of information, 2. Tronov V.P. et al. Technologists demuxed into account in the examination of coal-bearing oils and their mixtures. 1. Caspar nts K.S. Promyslova under-with Devonian. Works TatNIPIneft. cooking oil. M., “Nedra, 1966, p. 237-Iss. XXXIII, Bugulma, 1975, p. 73 and 74 254. (prototype).