Method of removing and neutralizing hydrogen sulfide and mercaptans, and installation

FIELD: crude oil treatment and petroleum processing.

SUBSTANCE: removal of hydrogen sulfide and mercaptans from crude oil and gas condensate is accomplished by directly heating oil well produce in hydrocyclone and treating released gases together with steam-gas mixture by hydrogen sulfide- and mercaptan-selective reagent: aqueous solution of 1-hydroxy-2[1,3-oxazetidin]-3-yl-ethane (C4H9O2N) followed by cooling at temperature not higher than 15°C and separation at pressure at least 1.3 excessive atm. Installation has stilling manifold, depulser, separators, hydrocyclone, condenser-cooler, gasoline separator, discharge pumps, buffer vessel, and tanks. Accumulation tank for cleaned product is provided with heated hydrocyclone having diminishing cone angle and steam-gas line exit connected to gasoline separator equipped with mass-exchange bulk attachment.

EFFECT: considerably improved quality of well produce and reduced loss of raw material.

2 cl, 3 dwg

 

The present invention relates to the preparation of the production of oil and gas condensate fields and can be used mainly for the removal of hydrogen sulfide and mercaptans contained in oil, gas condensate and oil products and their subsequent neutralization.

Known processes for the removal of hydrogen sulfide and mercaptans from petroleum and gas methods adsorption of the solid substance and the absorption liquid (see Amoscow. The collection and processing of oil and gas field. The subsoil. M., 1968, S-91 [1]).

For neutralization of hydrogen sulfide using various settings (see, for example, Amoscow. The collection and processing of oil and gas field. The subsoil. M., 1968, s-120 [1]), containing the absorber, the capacity of the drip pan, the refrigerating condenser, separator, tank and pump. As neutralizer of hydrogen sulfide and mercaptans are used alkali (usually NaOH), served in the alkaline tank when the temperature of the oil.

The disadvantage of insufficient quality cleaning oil from hydrogen sulfide and mercaptans and their neutralization.

The purpose of the invention is improving the efficiency of cleaning oil from hydrogen sulfide and mercaptans by the intensification of the process, and their neutralization and dismantlement of hydrocarbon gases.

The goal is to reach those that pre-negritude 60° With the oil is subjected to hydrocycloning, consisting in processing it in the field of centrifugal forces when the linear velocities in terms of 30-35 m/s in film mode, the expiration gas-liquid mixture. It reaches the processing of this mixture in the cyclone special design (see Optimization of separation in the hydrocyclone. / Signorino, ROS, ITV etc. // Problems of oil and gas complex in the conditions of formation of market relations. Collection of scientific articles. The Foundation for promotion of scientific research. - Ufa, 1999. V.2. - S-249 [2]), which in this mode the expiration of the gas-liquid mixture in the center of rotation of the thread forming vacuum (residual pressure in the center, as shown by numerous studies [3], does not exceed 250 mm Hg (Fin, V.I. Danilov, Nchorage. Stabilization of oil using a hydrocyclone. The Foundation for promotion of scientific research. - Ufa, 1996, p.64). In this center of rotation of the stream rushing gases of hydrogen sulfide, mercaptans, legkoletuchie hydrocarbons and vapor more "fat" hydrocarbons (butane, partially pentane and other), forming in the center of the gas-vapor mixture, by changing the coefficients of the phase equilibrium of the system "gas (vapor) - liquid".

For neutralization of hydrogen sulfide and mercaptans contained in the gas mixture, and recycling "fatty hydrocarbon gas vapor-gas mixture is cooled to 15° With and treated in the separator, where more light "dry" gases together with hydrogen sulfide and mercaptans sent to benzoapyrene equipped with mass transfer volume cap (see Results industrial mist eliminators with regular wire nozzle (RPN) Panchenkov / Wagrico, Msstart, ROS and other // the Collection, preparation and transportation of oil and oil products. Collection of scientific papers. Vniisptneft. - Ufa. 1991. - P.29-34 [4], constantly wetted selectively acting against hydrogen sulfide and mercaptans Converter representing a 70%aqueous solution of 1-hydroxy-2-[1,3 oxazolidine]-3-yl-ethane General formula C4H9O2N (U.S. Pat. Russia, having got NO 2173735, B. I. No. 26, 2001, application No. 99118348/13) [5].

The gidrotsiklonirovaniya heated oil below 60°not giving the desired results, especially when removing mercaptans. At the same time, heat the oil over 60°not economically justified for this process. Application temperature cooling below 15°not economically justified. From a technological point of view, a dedicated gas-vapor mixture well condenses and accumulates in bioseparation in the form of light hydrocarbons at the same temperature as the pressure in benzoapyrene technological mode is maintained in the range of 1.3 MPa. At lower pressures observed povyshen the y ash of light hydrocarbons, and the increase in pressure in this process leads to economically unjustified costs. In addition, it should be stated that at this temperature, cooling the condensation of mercaptans, as shown by numerous studies, is not happening. The hallmark of this method of removal and neutralization of hydrogen sulfide and mercaptans is the application process gidrotsiklonirovaniya gas-liquid mixture by typing in the hydrocyclone special design that provides preheating of raw materials and film mode leakage of the fluid, the removal of the film of liquid gases, particularly hydrogen sulfide and mercaptans due to changes of the values of the coefficients of the phase equilibrium of the system "gas (vapor) - liquid". In addition, the intensive influence of centrifugal forces on the heated, hydrogen sulfide and mercaptans containing production wells leads to the rupture of unstable relations of hydrogen sulfide and mercaptans from hydrocarbons (see, for example, a Quick reference for chemistry. Iggnorance, Uppdatering, Ethnocracy. "Naukova Dumka", Kiev, 1974 - S-405 [6]). Roughly the same can be said about the mercaptans. The influence of temperature (heat production wells) and high vacuum (residual pressure at the center of rotation of the stream is not more than 250 mm RT. post in the hydrocyclone special design ) is enough for the highlighted what I molecules of hydrogen sulfide and mercaptans from a layer of oil, condensate and their accumulation at the center of rotation of the thread, followed by processing in benzoapyrene with mass transfer volume cap, constantly wetted selectively acting against hydrogen sulfide and mercaptans reagent, which is an aqueous solution of 1-hydroxy-2-[1,3 oxazolidine]-3-yl-ethane General formula C4H9O2N.

The implementation of the method of removal and neutralization of hydrogen sulfide and mercaptans have been made on the installation of oil-gathering station "Alaturka" OOO "Basener". Unlike traditional units, the removal of hydrogen sulfide and mercaptans this installation was equipped with a separator with the installed heated hydrocyclone special design that provides preheating of production wells and film mode leakage of the fluid, and the creation of a vacuum at the center of rotation of the stream.

Figure 1 shows a schematic diagram of the proposed installation for implementing the method, figure 2 is heated hydrocyclone special design, figure 3 - graph of the results of commercial operation method.

The installation includes soothing collector 1, depositor 2, the separator 3 and 4, a heated cyclone 5, cumulative capacity (drip pan) 6, condensers 7, benzoapyrene 8, the pumps 9 and 12, the reservoir 10, the node uceta and buffer tank 13.

The method is implemented as follows.

Hydrogen sulfide and mercaptans containing products of oil wells is sent to the soothing collector 1, which is decreasing the speed of this product and later in depositor 2, where carry out preliminary selection of gas. In addition, in the same Depository discharge water. Oil with a residual gas which is free and distributed in the volume of liquid injected into the first separator stage 3. Gas from the separator 3 together with a gas stream from depositor 2 and sent to the gas treatment unit. In the separator 3 also discharge the residual water in the buffer tank 13, from which the pump 12 pump well pump station (SPS) for injection into reservoirs. Before entering production wells in the separator 4, as a rule, add the demulsifier and fresh water. Washed and prepared production wells is sent to the processor-hydrocyclone special design that ensures the process gidrotsiklonirovaniya products. The processor may be provided with one or more hydrocyclone elements. A distinctive feature of the hydrocyclone special design is that it provides preheating of the production wells through the supply hydrocyclone element of the heating device is, for example NGL-160, carrying out the heating by means of electric current. In addition, hydrocyclone element is designed so that at a distance of 1/3 from the base of the cone angle of the taper is reduced by 30%. Compared to conventional hydrocyclone elements of this design change is allowed to intensify the process gidrotsiklonirovaniya. In the hydrocyclone, as already mentioned, due to the intensive twist of the flux in the center of rotation of the vacuum is formed, the rush to gas-vapor mixture. Parameter definitions intensification process gidrotsiklonirovaniya is the magnitude of this dilution (see[3]). The improved design of the watercraft increases the magnitude of the underpressure of about 15-20% and provides a stable steam-cord at the center of rotation of the stream.

Direct heating of the product in hydrocyclone element 60°s allows more complete removal of hydrogen sulfide and mercaptans with a simultaneous decrease in losses of hydrocarbons. For trapping liquids gas-vapor mixture is directed into the storage tank 6 and later in the refrigerating condenser 7. Stable production wells after removal of the major part of the hydrogen sulfide and mercaptans in the gidrotsiklonirovaniya pumped by pump 9, for receiving n the tube which serves to selectively acting against hydrogen sulfide and mercaptans reagent = an aqueous solution of 1-hydroxy-2-[1,oxazolidin]-3-yl-ethane General formula C 4H9O2N, and then into the tank 10 and the metering unit 11. In the condenser of the refrigerator 7 heavy fractions of light hydrocarbons are in the form of condensate and come together with other gases in benzoapyrene 8, which occurs due to gravitational forces the separation of hydrogen sulfide and mercaptans with dry gases from the liquid and the accumulation of the condensed light hydrocarbons in the lower part of benzoapyrene 8. Released in benzogeneratora hydrogen sulfide and mercaptans together with dry gas is fed into the bottom of the volumetric mass transfer packing, made of regular wire nozzles and constantly wetted by the reagent that selectively acting against hydrogen sulfide and mercaptans. The products of the neutralization of hydrogen sulfide and mercaptans together with wastewater collected in the buffer tank 13 and served in the cluster pumping station (SPS) not only to maintain reservoir pressure, but also to inhibit the growth of sulfate reducing bacteria (SRBs).

The results of the commercial exploitation of the invention "Method of removal and naturalisatie of hydrogen sulfide and mercaptans and installation for its implementation are presented in graph form in figure 3.

As can be seen from the graphs the use of heated hydrocyclone new design in the plant made it possible to reach a share of extraction ser is hydrogen when hydrocycloning heated even up to 30° With oil 97%, methylmercaptan - 71%, and ethyl mercaptan - 54%. When hydrocycloning heated to 60°With oil content of hydrogen sulfide was reduced to traces, mercaptan - up to 2%), ethyl mercaptan, up to 8%, and the additional processing of the selected gas mixture using volumetric mass transfer nozzle, wetted applicable in relation to hydrogen sulfide and mercaptans reagent, which is an aqueous solution of 1-hydroxy-2-[1,oxazolidin]-3-yl-ethane General formula C4H9O2N, have helped to reduce this content to trace.

The use of the present invention has greatly improved the quality of production wells, to reduce the loss of hydrocarbons by condensation of vapor-gas mixture and complex use of condensate.

1. The method of removal and neutralization of hydrogen sulfide and mercaptans, which consists in the separation of these gases from the production of oil wells and the subsequent contacting them with the reagent, characterized in that the hydrogen sulphide and mercaptans performed by directly heating the products of oil wells in the hydrocyclone to a temperature of 60°and selected gases with vapor-gas mixture is treated with selective towards hydrogen sulfide and mercaptans reagent - aqueous solution of 1-hydroxy-2-[1,3-oxazolidin]-3-yl-ethane total fo the mules C 4H9O2N, is cooled at a temperature not higher than 15°and sephirot at a pressure of at least 1.3 MPa.

2. Installation for implementing the method according to claim 1, comprising a sedative collector, depositor, separators, hydrocyclone, condensers, benzoapyrene, pumps, buffer tank and storage tanks, characterized in that the storage tank, the purified product is equipped with a heated cyclone with decreasing cone angle, and the output vapor-gas line it is connected with benzoapyrene equipped with mass transfer volume cap.



 

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