Desulfurization method of organic liquid for removing hydrogen sulfide in oil and gas field

Abstract

The invention relates to the technical field of hydrogen sulfide treatment, in particular to a sulfur removal method of organic liquid for removing hydrogen sulfide in an oil and gas field. Inputting the to-be-extracted hydrogen sulfide oil liquid into a sulfur removal liquid membrane pipeline so as to respectively output sulfur removal oil liquid and sulfur-containing extraction liquid; judging whether the continuity of extraction desulfurization meets the requirement or not; if the continuity does not meet the requirement, executing a pipeline dredging mode, including adjusting the pressure regulating rate of the pipe diameter change position of the oil conveying pipe, or determining a liquid film treatment mode, including adjusting the input flow rate of the extraction liquid when the extraction liquid is input into the desulfurization liquid film pipeline, or determining the cleaning period of the desulfurization liquid film pipeline; determining the inflow angle of the extraction liquid flowing into the desulfurization liquid membrane pipeline from the liquid conveying pipe; extracting hydrogen sulfide in subsequent to-be-extracted hydrogen sulfide oil liquid; carrying out desulfurization reaction to reduce the extract liquor; and the reduced extraction liquid is conveyed into a sulfur removal liquid membrane pipeline through a liquid conveying pipe. According to the invention, the desulfurization efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of hydrogen sulfide treatment, and in particular to a desulfurization method of an organic liquid for removing hydrogen sulfide in an oil and gas field. Background Art

[0002] In the current technical field, a treatment method containing specific organic liquids is generally used to remove hydrogen sulfide in oil and gas fields. The main components of these organic liquids usually include triazine compound additives. This type of organic liquid is used as a hydrogen sulfide remover. It is not only used for the treatment of single wells, but also used in the produced fluid treatment process of joint stations and in the water-based mud system used in drilling. Its main function is to effectively remove hydrogen sulfide, mercaptans and other sulfur-containing compounds in gas or liquid hydrocarbons, thereby ensuring the safe production of oil and gas fields and the protection of the environment.

[0003] Chinese Patent Publication No.: CN113813769B discloses a method and device for removing organic sulfur from gas using a composite ionic liquid desulfurizer, wherein the composite ionic liquid desulfurizer includes an amino acid ionic liquid and a composite auxiliary agent, wherein the amino acid ionic liquid includes a quaternary ammonium group, an imidazole group, a pyridyl group cation containing an alkyl substituent and an amino acid anion containing a carboxyl group and an amino group; the composite auxiliary agent is a sulfone amine organic solvent; the sulfone amine organic solvent includes methyldiethanolamine and cyclopentane sulfone. It can be seen that the method and device for removing organic sulfur from gas using the composite ionic liquid desulfurizer has the following problems: the degree of impact on the pipeline caused by excessive adjustment of the oil flow rate during oil transmission increases, thereby increasing the suspended matter generated, resulting in a decrease in the permeability of the desulfurization liquid membrane; the temperature of the hydrogen sulfide medium decreases when it enters the desulfurization liquid membrane of the circulating extract, resulting in a decrease in the fluidity of the hydrogen sulfide medium, thereby resulting in a decrease in the desulfurization efficiency; and the low shearing effect of the desulfurization liquid membrane promotes a decrease in the mass transfer efficiency perpendicular to the membrane surface, thereby resulting in a decrease in the desulfurization effect. Summary of the invention

[0004] To this end, the present invention provides a desulfurization method for an organic liquid used to remove hydrogen sulfide in an oil and gas field, so as to overcome the problems in the prior art that during the oil transmission process, the degree of impact on the pipeline increases due to excessive adjustment of the oil flow rate, thereby increasing the suspended matter generated, resulting in reduced permeability of the desulfurization liquid membrane, reduced fluidity of the hydrogen sulfide medium due to the decrease in temperature when the hydrogen sulfide medium enters the desulfurization liquid membrane of the circulating extract, thereby resulting in reduced desulfurization efficiency, and low shear action of the desulfurization liquid membrane, which promotes a decrease in mass transfer efficiency perpendicular to the membrane surface and thus reduces the desulfurization effect.

[0005] To achieve the above object, the present invention provides a desulfurization method for removing hydrogen sulfide from an oil and gas field using an organic liquid, comprising:

[0006] Step S1, sequentially precipitating and filtering the hydrogen sulfide-containing oil to output the hydrogen sulfide oil to be extracted;

[0007] Step S2, the hydrogen sulfide oil to be extracted is fed into the desulfurization liquid membrane pipeline containing the extract in the fiber membrane through the oil pipeline to output the desulfurized oil and the sulfur-containing extract respectively;

[0008] Step S3, judging whether the continuity of the extraction and desulfurization meets the requirements according to the flow change of the hydrogen sulfide oil to be extracted in the desulfurization liquid membrane pipeline;

[0009] Step S4, if the continuity does not meet the requirements, then execute the pipeline dredging method, including adjusting the pressure regulation rate of the position where the diameter of the oil pipeline changes, or determine the liquid membrane treatment method according to the temperature of the input port of the desulfurization liquid membrane pipeline, including adjusting the input flow rate of the extract when it is input into the desulfurization liquid membrane pipeline,

[0010] Or, the cleaning cycle of the desulfurization liquid membrane pipeline is determined according to the maximum pressure change of the inner wall of the desulfurization liquid membrane pipeline;

[0011] Step S5, if the liquid film treatment method is performed according to the input flow rate, the vibration intensity of the desulfurization liquid film pipeline is obtained;

[0012] Step S6, determining the inflow angle of the extract from the liquid infusion pipe into the desulfurization liquid membrane pipeline according to the vibration intensity;

[0013] Step S7, extracting hydrogen sulfide from the subsequent hydrogen sulfide oil to be extracted according to the pipeline dredging method;

[0014] Step S8, performing a desulfurization reaction on the sulfur-containing extract to reduce the extract;

[0015] Step S9, inputting the reduced extract from the liquid infusion pipe into the desulfurization liquid membrane pipeline, and repeating steps S2-S8.

[0016] Furthermore, the extract comprises trioctylphosphine, tert-butylamine and water.

[0017] Further, if the flow change of the hydrogen sulfide oil to be extracted in the desulfurization liquid membrane pipeline is less than the preset first flow change, it is determined that the continuity of the extraction desulfurization meets the requirements; if the flow change is greater than the preset first flow change, it is determined that the continuity of the extraction desulfurization does not meet the requirements;

[0018] The flow rate change is the difference between the flow rate of the hydrogen sulfide oil to be extracted when it enters the desulfurization liquid membrane pipeline and the flow rate of the desulfurized oil when it exits the desulfurization liquid membrane pipeline.

[0019] Further, adjusting the pressure regulation rate at the position where the diameter of the oil pipeline changes includes:

[0020] Comparing the flow rate change with a preset second flow rate change;

[0021] If the flow rate change is greater than the preset second flow rate change, reducing the pressure regulation rate at the position where the diameter of the oil pipeline changes;

[0022] The pressure regulation rate is negatively correlated with the flow rate change.

[0023] Further, adjusting the input flow rate of the extract when inputting the desulfurization liquid membrane pipeline includes:

[0024] Comparing the flow rate change with the preset first flow rate change and the preset second flow rate change respectively;

[0025] If the flow rate change is greater than the preset first flow rate change and less than or equal to the preset second flow rate change, it is preliminarily determined that the fluidity of the hydrogen sulfide oil to be extracted does not meet the requirements, and the temperature of the input position of the desulfurization liquid membrane pipeline is obtained;

[0026] Comparing the temperature of the input position of the desulfurization liquid membrane pipeline with the preset second temperature;

[0027] If the temperature at the input position of the desulfurization liquid membrane pipeline is lower than the second preset temperature, it is determined that the fluidity of the hydrogen sulfide oil to be extracted does not meet the requirements, and the input flow rate of the extracting liquid when inputting the desulfurization liquid membrane pipeline is reduced.

[0028] Furthermore, the input flow rate is positively correlated with the temperature.

[0029] Further, the cleaning cycle of the desulfurization liquid membrane pipeline is determined according to the maximum pressure change of the inner wall of the desulfurization liquid membrane pipeline, including:

[0030] Comparing the temperature of the input position of the desulfurization liquid membrane pipeline with the preset first temperature and the preset second temperature respectively;

[0031] If the temperature at the input position of the desulfurization liquid membrane pipeline is greater than the preset second temperature and less than or equal to the preset first temperature, it is preliminarily determined that the deposition degree of the desulfurization liquid membrane pipeline does not meet the requirements, and the maximum value of the pressure change per unit length of the inner wall of the desulfurization liquid membrane pipeline is obtained and recorded as the maximum pressure change;

[0032] Comparing the maximum pressure change with a preset pressure change;

[0033] If the maximum pressure change is greater than the preset pressure change, it is determined that the deposition degree of the desulfurization liquid membrane pipeline does not meet the requirements, and the cleaning cycle of the desulfurization liquid membrane pipeline is increased;

[0034] The pressure change is the difference between the pressure at the starting position of a unit length of the inner wall of the desulfurization liquid membrane pipeline in the axial direction and the pressure at the end position of the unit length.

[0035] Furthermore, the cleaning cycle is positively correlated with the maximum pressure change.

[0036] Further, determining the inflow angle of the extract from the liquid infusion pipe into the desulfurization liquid membrane pipeline according to the vibration intensity includes:

[0037] comparing the vibration intensity with a preset vibration intensity;

[0038] If the vibration intensity is less than the preset vibration intensity, it is determined that the extraction turbulence degree does not meet the requirements, and the inflow angle of the extraction liquid is reduced;

[0039] Among them, the inflow angle of the extract is the acute angle formed by the axial diameter of the liquid infusion pipe and the desulfurization liquid membrane pipeline.

[0040] Furthermore, the inflow angle is positively correlated with the vibration intensity.

[0041] Compared with the prior art, the beneficial effect of the present invention lies in that the method of the present invention uses a desulfurization liquid membrane pipeline to desulfurize the hydrogen sulfide medium, and utilizes the radiation source resistance, good water absorption and high flux characteristics of the desulfurization liquid membrane pipeline to remove the hydrogen sulfide in the medium to improve the desulfurization efficiency. Since the hydrogen sulfide oil to be extracted contains suspended matter or corrodes the pipeline during pipeline transportation, the suspended matter in the medium before entering the desulfurization liquid membrane pipeline increases, resulting in an increase in the squeezing force of the hydrogen sulfide oil to be extracted on the liquid membrane at the inlet of the desulfurization liquid membrane pipeline. The pressure regulation rate at the position where the diameter of the oil pipeline changes is adjusted to reduce the pressure on the oil pipeline during the oil transportation process. The collision vibration intensity of the oil pipeline and the degree of rolling up of the accumulated sediment at the position where the pipe diameter changes due to the pressure-regulated reflux can reduce the generation or lifting of suspended matter during oil transportation; because when the hydrogen sulfide oil to be extracted enters the desulfurization liquid membrane pipeline, the temperature of the desulfurization liquid membrane pipeline is lower than the temperature in the oil pipeline, which leads to a decrease in the fluidity of the liquid to be extracted. By adjusting the flow rate of the circulating extraction liquid in the desulfurization liquid membrane pipeline, the pressure between the two liquids at the inlet position caused by the further expansion of the desulfurization liquid membrane due to the introduction of the extraction liquid is reduced, and the further reduction of the temperature of the desulfurization liquid membrane pipeline inlet by the circulating extraction liquid is reduced, the desulfurization efficiency is improved.

[0042] Furthermore, the method of the present invention sets a preset second flow change. Due to the presence of suspended matter that cannot be precipitated during the sedimentation treatment of the hydrogen sulfide-containing oil or due to the fast conveying rate and high conveying pressure during the transportation process, the impact force between the hydrogen sulfide oil to be extracted and the pipe wall at the pipe diameter change position increases, thereby causing the pipe wall to corrode and fall off or the precipitated suspended matter to be lifted up. In addition, due to the pressure regulation and reflux of the oil during the pressure regulation process, the deposited material at the pipe diameter change position is rolled up by the refluxed oil, causing the suspended matter to be scattered in the oil and then input into the desulfurization liquid membrane pipeline. When the extracted liquid enters the desulfurization liquid membrane pipeline, the change in the flow rate of the medium flowing into and out of the desulfurization liquid membrane pipeline increases due to the influence of the existing suspended matter. By reducing the pressure regulation rate and thereby reducing the impact potential energy of the hydrogen sulfide oil to be extracted on the oil pipeline wall and reducing the degree of lifting of the suspended matter, the permeability of the desulfurization liquid membrane is increased, and the degree of damage to the liquid membrane caused by the extrusion force caused by the accumulation of suspended matter at the inlet of the desulfurization liquid membrane pipeline is reduced.

[0043] Furthermore, the method of the present invention sets a preset second temperature. Since the temperature of the hydrogen sulfide oil to be extracted in the oil pipeline decreases, the viscosity increases and the fluidity decreases, thereby affecting the extraction effect and the desulfurization efficiency, and directly weakening the interaction between the extractant and hydrogen sulfide, resulting in a significant decrease in the extraction efficiency. The desulfurization efficiency is increased by reducing the input flow rate of the extract when it is input into the desulfurization liquid membrane pipeline, reducing the expansion degree of the liquid membrane at the input position, and reducing the further cooling of the liquid membrane by the circulating extract, thereby reducing the desulfurization efficiency.

[0044] Furthermore, the method of the present invention sets a preset first temperature and a preset pressure change. During the desulfurization process entering the desulfurization liquid membrane pipeline, the concentration of the hydrogen sulfide oil to be extracted is too high, resulting in a reduction in the heat dissipation capacity during the oil transportation process, thereby causing a low degree of temperature change. The medium with a high viscosity is prone to accumulate sediments on the membrane wall of the liquid membrane during the process of contacting with the liquid membrane to absorb hydrogen sulfide, resulting in a location where the flow is not smooth in the liquid membrane. By increasing the cleaning cycle of the desulfurization liquid membrane pipeline, the liquid membrane is cleaned, the permeability of the liquid membrane is maintained, the reduction in desulfurization efficiency due to accumulated sediments is avoided, and the desulfurization effect is increased.

[0045] Furthermore, the method of the present invention sets a preset vibration intensity, and due to the increased contact time, the flow state of the extract in the liquid membrane is changed to a laminar state that is not conducive to medium transfer, thereby reducing the shear effect of the liquid membrane wall and the mass transfer of hydrogen sulfide perpendicular to the membrane surface. By increasing the inflow angle of the extract and the degree of turbulence of the extract when flowing into the liquid membrane, the extract forms an impact flow on the surface of the liquid membrane, thereby achieving an increase in the desulfurization mass transfer effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1This is an overall flow chart of a desulfurization method for removing hydrogen sulfide from an oil and gas field using an organic liquid according to an embodiment of the present invention;

[0047] Figure 2 This is a schematic diagram of the structure of a partial desulfurization device of a desulfurization method for removing hydrogen sulfide from an oil and gas field using an organic liquid according to an embodiment of the present invention;

[0048] Figure 3 It is a flow chart of the pressure regulation rate for adjusting the position of the diameter change of the oil pipeline in the desulfurization method of the organic liquid for removing hydrogen sulfide in the oil and gas field according to the embodiment of the present invention;

[0049] Figure 4 This is a flow chart of the input flow rate of adjusting the extract when inputting the desulfurization liquid membrane pipeline in the desulfurization method of an organic liquid for removing hydrogen sulfide in an oil and gas field according to an embodiment of the present invention;

[0050] Description of the accompanying drawings: 1-housing, 2-oil inlet pipe, 3-speed regulating valve, 4-steering motor, 5-liquid delivery pipe, 6-reaction chamber, 7-liquid outlet pipe, 8-oil outlet pipe, 9-displacement sensor, 10-oil delivery pipe. DETAILED DESCRIPTION

[0051] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0052] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0053] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0054] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] See also Figure 1 , Figure 2 , Figure 3 as well as Figure 4 As shown, they are respectively an overall flow chart of the desulfurization method for removing hydrogen sulfide from an organic liquid in an oil and gas field according to an embodiment of the present invention, a schematic diagram of the structure of a partial desulfurization device, a flow chart of the pressure regulation rate for adjusting the position of the pipe diameter change of the oil pipeline, and a flow chart of adjusting the input flow rate of the extract when inputting the desulfurization liquid membrane pipeline. The desulfurization method for removing hydrogen sulfide from an organic liquid in an oil and gas field according to an embodiment of the present invention comprises:

[0056] Step S1, sequentially precipitating and filtering the hydrogen sulfide-containing oil to output the hydrogen sulfide oil to be extracted;

[0057] Step S2, the hydrogen sulfide oil to be extracted is fed into the desulfurization liquid membrane pipeline containing the extract in the fiber membrane through the oil pipeline 10 to output the desulfurized oil and the sulfur-containing extract respectively;

[0058] Step S3, judging whether the continuity of the extraction and desulfurization meets the requirements according to the flow change of the hydrogen sulfide oil to be extracted in the desulfurization liquid membrane pipeline;

[0059] Step S4, if the continuity does not meet the requirements, then execute the pipeline dredging method, including adjusting the pressure regulation rate of the diameter change position of the oil pipeline 10, or determine the liquid film treatment method according to the temperature of the input port of the desulfurization liquid membrane pipeline, including adjusting the input flow rate of the extract when inputting the desulfurization liquid membrane pipeline,

[0060] Or, the cleaning cycle of the desulfurization liquid membrane pipeline is determined according to the maximum pressure change of the inner wall of the desulfurization liquid membrane pipeline;

[0061] Step S5, if the liquid film treatment method is performed according to the input flow rate, the vibration intensity of the desulfurization liquid film pipeline is obtained;

[0062] Step S6, determining the inflow angle of the extract from the liquid delivery pipe 5 into the desulfurization liquid membrane pipeline according to the vibration intensity;

[0063] Step S7, extracting hydrogen sulfide from the subsequent hydrogen sulfide oil to be extracted according to the pipeline dredging method;

[0064] Step S8, performing a desulfurization reaction on the sulfur-containing extract to reduce the extract;

[0065] Step S9, input the reduced extract from the liquid infusion pipe 5 into the desulfurization liquid membrane pipeline, and repeat steps S2-S8.

[0066] Specifically, the form of the desulfurization liquid membrane pipeline is a hollow fiber supported liquid membrane.

[0067] Specifically, the treatment time for the precipitation treatment of the crude oil containing hydrogen sulfide is determined according to the viscosity of the crude oil, the treatment method of the filtration treatment is to intercept and filter the impurities and suspended matter in the crude oil through the filter screen and the filter element, the hydrogen sulfide-containing oil is the crude oil containing hydrogen sulfide, and the treatment methods of the precipitation treatment and the filtration treatment of the crude oil containing hydrogen sulfide are technical means well known to those skilled in the art, so they will not be described in detail.

[0068] Specifically, the extract flows in through the liquid infusion pipe 5 connected to the desulfurization liquid membrane pipeline, and the sulfur-containing extract flows out through the liquid outlet pipe 7 connected to the desulfurization liquid membrane pipeline.

[0069] Specifically, the ends of the liquid outlet pipe 7 and the liquid infusion pipe 5 away from the desulfurization liquid membrane pipeline are respectively connected to a reaction chamber 6 that provides a desulfurization reaction space for the sulfur-containing extract.

[0070] Specifically, the method of carrying out a desulfurization reaction on the extract is to introduce oxygen into the sulfur-containing extract.

[0071] In practice, the method of the present invention uses a desulfurization liquid membrane pipeline to desulfurize the hydrogen sulfide medium, and utilizes the characteristics of the desulfurization liquid membrane pipeline that is resistant to radiation sources, good water absorption, and high flux to remove hydrogen sulfide in the medium to improve the desulfurization efficiency. Since the hydrogen sulfide oil to be extracted contains suspended matter or corrodes the pipeline during pipeline transportation, the suspended matter in the medium increases before entering the desulfurization liquid membrane pipeline, resulting in an increase in the squeezing force of the hydrogen sulfide oil to be extracted on the liquid membrane at the inlet of the desulfurization liquid membrane pipeline. The pressure regulation rate at the position where the diameter of the oil pipeline 10 changes is adjusted to reduce the collision vibration of the oil pipeline 10 during the oil transportation process. The dynamic strength and the degree of rolling up of the accumulated sediment at the position where the pipe diameter changes can be reduced by the pressure-regulated reflux, thereby reducing the generation or lifting of suspended matter during the oil transportation process; because when the hydrogen sulfide oil to be extracted enters the desulfurization liquid membrane pipeline, the temperature of the desulfurization liquid membrane pipeline is lower than the temperature in the oil pipeline 10, which leads to a decrease in the fluidity of the liquid to be extracted. By adjusting the flow rate of the circulating extraction liquid in the desulfurization liquid membrane pipeline, the pressure between the two liquids at the inlet position caused by the further expansion of the desulfurization liquid membrane due to the introduction of the extraction liquid is reduced, and the further reduction of the temperature of the desulfurization liquid membrane pipeline inlet by the circulating extraction liquid is reduced, thereby improving the desulfurization efficiency.

[0072] Specifically, the extract comprises trioctylphosphine, tert-butylamine and water.

[0073] Specifically, trioctylphosphine is used as the extractant, and tert-butylamine is used as the stabilizer.

[0074] Specifically, the general range of the volume proportion of trioctylphosphine in the extract is [50%, 70%], the general range of the volume proportion of tert-butylamine in the extract is [5%, 15%], the preferred embodiment of the volume proportion of trioctylphosphine in the extract is 60%, the preferred embodiment of the volume proportion of tert-butylamine in the extract is 10%, and the rest is water.

[0075] In implementation, the method of the present invention sets a preset second flow change. Due to the presence of suspended matter that cannot be precipitated during the precipitation treatment of the hydrogen sulfide-containing oil or due to the fast conveying rate and high conveying pressure during the transportation process, the impact force between the hydrogen sulfide oil to be extracted and the pipe wall at the pipe diameter change position increases, thereby causing the pipe wall to corrode and fall off or the precipitated suspended matter to be lifted up. In addition, due to the pressure regulation and reflux of the oil during the pressure regulation process, the deposited material at the pipe diameter change position is rolled up by the refluxed oil, causing the suspended matter to be scattered in the oil and then input into the desulfurization liquid membrane pipeline. When the extracted liquid enters the desulfurization liquid membrane pipeline, the change in the flow rate of the medium flowing into and out of the desulfurization liquid membrane pipeline increases due to the influence of the existing suspended matter. By reducing the pressure regulation rate, the impact potential energy of the hydrogen sulfide oil to be extracted on the wall of the oil pipeline 10 and the degree of lifting of the suspended matter are reduced, thereby achieving an increase in the permeability of the desulfurization liquid membrane and reducing the degree of damage to the liquid membrane caused by the extrusion force caused by the accumulation of suspended matter at the inlet of the desulfurization liquid membrane pipeline.

[0076] Specifically, if the flow change of the hydrogen sulfide oil to be extracted in the desulfurization liquid membrane pipeline is less than the preset first flow change, it is determined that the continuity of the extraction desulfurization meets the requirements; if the flow change is greater than the preset first flow change, it is determined that the continuity of the extraction desulfurization does not meet the requirements;

[0077] The flow rate change is the difference between the flow rate of the hydrogen sulfide oil to be extracted when it enters the desulfurization liquid membrane pipeline and the flow rate of the desulfurized oil when it exits the desulfurization liquid membrane pipeline.

[0078] Specifically, adjusting the pressure regulating rate of the diameter change position of the oil pipeline 10 includes:

[0079] Comparing the flow rate change with a preset second flow rate change;

[0080] If the flow rate change is greater than the preset second flow rate change, the pressure regulation rate of the position where the diameter of the oil pipeline 10 changes is reduced;

[0081] The pressure regulation rate is negatively correlated with the flow rate change.

[0082] Specifically, the pressure regulation rate of the oil pipeline 10 at the position where the pipe diameter changes is controlled by the speed regulating valve 3 at the position where the pipe diameter changes.

[0083] Specifically, the desulfurization liquid film pipeline is connected with an oil inlet pipe 2 and an oil outlet pipe 8, and the outer wall of the desulfurization liquid film pipeline is sleeved with a shell 1.

[0084] Specifically, flow meters are provided on the inner walls of the oil inlet pipe 2 and the oil outlet pipe 8 .

[0085] Specifically, the general value range of the preset first flow rate change amount is [2.5 μl / min, 2.8 μl / min], and the general value range of the preset second flow rate change amount is [1.5 μl / min, 2 μl / min].

[0086] Preferably, the preferred embodiment of the preset first flow rate change amount is 2.6 μl / min, and the preferred embodiment of the preset second flow rate change amount is 1.8 μl / min.

[0087] In implementation, when the difference between the flow change and the preset second flow change is within 0.1μl / min, the pressure regulation rate at the diameter change position of the oil pipeline 10 is reduced to 0.9 times the original value. When the difference between the flow change and the preset second flow change exceeds 0.1μl / min, the pressure regulation rate at the diameter change position of the oil pipeline 10 is reduced by 0.1MPa / min for every 0.1μl / min exceeding the difference. For example, when the flow change is 2.8μl / min, and the current pressure regulation rate at the diameter change position of the oil pipeline 10 is 6.5MPa / min, the pressure regulation rate is adjusted to 6.5MPa / min×0.9-0.1MPa / min×3=5.55MPa / min.

[0088] In implementation, the method of the present invention sets a preset second temperature. Since the temperature of the hydrogen sulfide oil to be extracted in the oil pipeline 10 is reduced, the viscosity increases and the fluidity decreases, thereby affecting the extraction effect and the desulfurization efficiency, and directly weakening the interaction between the extractant and hydrogen sulfide, resulting in a significant reduction in the extraction efficiency; by reducing the input flow rate of the extracting liquid when it is input into the desulfurization liquid membrane pipeline, reducing the expansion degree of the liquid membrane at the input position and reducing the further cooling of the liquid membrane by the circulating extracting liquid, the desulfurization efficiency is increased.

[0089] Specifically, adjusting the input flow rate of the extract when inputting the desulfurization liquid membrane pipeline includes:

[0090] Comparing the flow rate change with the preset first flow rate change and the preset second flow rate change respectively;

[0091] If the flow rate change is greater than the preset first flow rate change and less than or equal to the preset second flow rate change, it is preliminarily determined that the fluidity of the hydrogen sulfide oil to be extracted does not meet the requirements, and the temperature of the input position of the desulfurization liquid membrane pipeline is obtained;

[0092] Comparing the temperature of the input position of the desulfurization liquid membrane pipeline with the preset second temperature;

[0093] If the temperature at the input position of the desulfurization liquid membrane pipeline is lower than the second preset temperature, it is determined that the fluidity of the hydrogen sulfide oil to be extracted does not meet the requirements, and the input flow rate of the extracting liquid when inputting the desulfurization liquid membrane pipeline is reduced.

[0094] Specifically, the input flow rate is positively correlated with the temperature.

[0095] Specifically, the input flow rate is adjusted by the infusion pump in the infusion tube 5 .

[0096] Specifically, a temperature sensor is provided on the inner wall of the oil inlet pipe 2 .

[0097] Specifically, the general value range of the preset first temperature is [38° C., 42° C.], and the general value range of the preset second temperature is [30° C., 35° C.].

[0098] Preferably, the preferred embodiment of the preset first temperature is 40°C, and the preferred embodiment of the preset second temperature is 32°C.

[0099] During implementation, when the difference between the temperature at the input position of the desulfurization liquid membrane pipeline and the preset second temperature is within 0.5°C, the input flow rate of the extract when it is input into the desulfurization liquid membrane pipeline is reduced by 0.1 m / s. When the difference between the temperature at the input position of the desulfurization liquid membrane pipeline and the preset second temperature exceeds 0.5°C, the input flow rate of the extract when it is input into the desulfurization liquid membrane pipeline is reduced by 0.04 m / s for every 0.5°C increase. For example, when the temperature at the input position of the desulfurization liquid membrane pipeline is 30°C and the current input flow rate is 2 m / s, the input flow rate is reduced to 2 m / s-0.1 m / s-0.04 m / s=1.86 m / s.

[0100] In implementation, the method of the present invention sets a preset first temperature and a preset pressure change. During the desulfurization process entering the desulfurization liquid membrane pipeline, the concentration of the hydrogen sulfide oil to be extracted is too high, resulting in a reduction in the heat dissipation capacity during the oil transportation process, thereby causing a low degree of temperature change. The medium with a high viscosity is prone to accumulate sediments on the membrane wall of the liquid membrane during the process of contacting with the liquid membrane to absorb hydrogen sulfide, resulting in a location where the flow is not smooth in the liquid membrane. By increasing the cleaning cycle of the desulfurization liquid membrane pipeline, the liquid membrane is cleaned, the permeability of the liquid membrane is maintained, the reduction in desulfurization efficiency due to accumulated sediments is avoided, and the desulfurization effect is increased.

[0101] Specifically, the cleaning cycle of the desulfurization liquid membrane pipeline is determined according to the maximum pressure change of the inner wall of the desulfurization liquid membrane pipeline, including:

[0102] Comparing the temperature of the input position of the desulfurization liquid membrane pipeline with the preset first temperature and the preset second temperature respectively;

[0103] If the temperature at the input position of the desulfurization liquid membrane pipeline is greater than the preset second temperature and less than or equal to the preset first temperature, it is preliminarily determined that the blockage degree of the desulfurization liquid membrane pipeline does not meet the requirements, and the maximum value of the pressure change per unit length of the inner wall of the desulfurization liquid membrane pipeline is obtained and recorded as the maximum pressure change;

[0104] Comparing the maximum pressure change with a preset pressure change;

[0105] If the maximum pressure change is greater than the preset pressure change, it is determined that the blockage degree of the desulfurization liquid membrane pipeline does not meet the requirements, and the cleaning cycle of the desulfurization liquid membrane pipeline is increased;

[0106] The pressure change is the difference between the pressure at the starting position of a unit length of the inner wall of the desulfurization liquid membrane pipeline in the axial direction and the pressure at the end position of the unit length.

[0107] Specifically, the cleaning period is positively correlated with the maximum pressure change.

[0108] Specifically, pressure sensors are axially arranged at equal intervals on the inner wall of the shell 1 of the desulfurization liquid membrane pipeline.

[0109] Specifically, the value range of the preset pressure change is [0.02Mpa, 0.06Mpa], and the preferred embodiment of the preset pressure change is 0.03Mpa.

[0110] During implementation, when the difference between the maximum pressure change and the preset pressure change is within 0.005Mpa, the cleaning cycle of the desulfurization liquid membrane pipeline is increased by 1 time / year. When the maximum pressure change and the preset pressure change are within 0.005Mpa, the cleaning cycle of the desulfurization liquid membrane pipeline is increased by 1 time / year for every 0.005Mpa exceeding the maximum pressure change. For example, if the maximum pressure change is 0.04Mpa and the current cleaning cycle is 8 times / year, the cleaning cycle is increased to 8 times / year + 1 time / year + 1 time / year = 10 times / year.

[0111] Specifically, determining the inflow angle of the extract from the liquid infusion pipe 5 into the desulfurization liquid membrane pipeline according to the vibration intensity includes:

[0112] comparing the vibration intensity with a preset vibration intensity;

[0113] If the vibration intensity is less than the preset vibration intensity, it is determined that the extraction turbulence degree does not meet the requirements, and the inflow angle of the extraction liquid is reduced;

[0114] The inflow angle of the extract is the acute angle formed by the liquid delivery pipe 5 and the axial diameter of the desulfurization liquid membrane pipeline.

[0115] Specifically, the inflow angle is positively correlated with the vibration intensity.

[0116] Specifically, the vibration intensity of the desulfurization liquid membrane pipeline is detected by a displacement sensor 9 arranged above the desulfurization liquid membrane pipeline.

[0117] Specifically, a steering motor 4 is provided between the extracting liquid infusion pipe 5 and the desulfurization liquid membrane pipeline to adjust the inflow angle of the extracting liquid.

[0118] Specifically, the steering motor 4 controls the liquid delivery pipe 5 connected to the desulfurization liquid film pipeline to deflect toward the oil inlet pipe 2 to reduce the inflow angle.

[0119] Specifically, the general value range of the preset vibration intensity is [0.4 mm / s, 0.6 mm / s], and the preferred embodiment of the preset vibration intensity is 0.5 mm / s.

[0120] During implementation, when the difference between the vibration intensity and the preset vibration intensity is within 0.01 mm / s, the inflow angle is reduced by 2°. When the difference between the vibration intensity and the preset vibration intensity exceeds 0.01 mm / s, the inflow angle is reduced by 3° for every 0.01 mm / s. For example, when the vibration intensity is 0.07 mm / s and the current inflow angle is 85°, the inflow angle is reduced to 85-2-3=80°.

[0121] In implementation, the method of the present invention sets a preset vibration intensity. Due to the increased contact time, the flow state of the extract in the liquid film is changed to a laminar state that is not conducive to medium transfer, thereby reducing the shear effect of the liquid film wall and the mass transfer of hydrogen sulfide perpendicular to the membrane surface. By increasing the inflow angle of the extract and the degree of turbulence of the extract when flowing into the liquid film, the extract forms an impact flow on the surface of the liquid film, thereby achieving an increase in the desulfurization mass transfer effect.

[0122] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A method for removing sulfur from an organic liquid in an oil and gas field by removing hydrogen sulfide, characterized in that: include: Step S1, sequentially precipitating and filtering the hydrogen sulfide-containing oil to output the hydrogen sulfide oil to be extracted; Step S2, the hydrogen sulfide oil to be extracted is fed into the desulfurization liquid membrane pipeline containing the extract in the fiber membrane through the oil pipeline to output the desulfurized oil and the sulfur-containing extract respectively; Step S3, judging whether the continuity of the extraction and desulfurization meets the requirements according to the flow change of the hydrogen sulfide oil to be extracted in the desulfurization liquid membrane pipeline; Step S4, if the continuity does not meet the requirements, then execute the pipeline dredging method, including adjusting the pressure regulation rate of the position where the diameter of the oil pipeline changes, or determine the liquid membrane treatment method according to the temperature of the input port of the desulfurization liquid membrane pipeline, including adjusting the input flow rate of the extract when it is input into the desulfurization liquid membrane pipeline, Or, the cleaning cycle of the desulfurization liquid membrane pipeline is determined according to the maximum pressure change of the inner wall of the desulfurization liquid membrane pipeline; Step S5, if the liquid film treatment method is performed according to the input flow rate, the vibration intensity of the desulfurization liquid film pipeline is obtained; Step S6, determining the inflow angle of the extract from the liquid infusion pipe into the desulfurization liquid membrane pipeline according to the vibration intensity; Step S7, extracting hydrogen sulfide from the subsequent hydrogen sulfide oil to be extracted according to the pipeline dredging method; Step S8, performing a desulfurization reaction on the sulfur-containing extract to reduce the extract; Step S9, inputting the reduced extract from the liquid infusion pipe into the desulfurization liquid membrane pipeline, and repeating steps S2-S8.

2. The desulfurization method for removing hydrogen sulfide from oil and gas fields using organic liquid according to claim 1, characterized in that: The extract comprises trioctylphosphine, tert-butylamine and water.

3. The desulfurization method for removing hydrogen sulfide from oil and gas fields using organic liquid according to claim 2, characterized in that: If the flow change of the hydrogen sulfide oil to be extracted in the desulfurization liquid membrane pipeline is less than the preset first flow change, it is determined that the continuity of the extraction desulfurization meets the requirements; if the flow change is greater than the preset first flow change, it is determined that the continuity of the extraction desulfurization does not meet the requirements; The flow rate change is the difference between the flow rate of the hydrogen sulfide oil to be extracted when it enters the desulfurization liquid membrane pipeline and the flow rate of the desulfurized oil when it exits the desulfurization liquid membrane pipeline.

4. The desulfurization method of organic liquid for removing hydrogen sulfide in oil and gas fields according to claim 3, characterized in that: The pressure regulating rate of adjusting the diameter change position of the oil pipeline includes: Comparing the flow rate change with a preset second flow rate change; If the flow rate change is greater than the preset second flow rate change, reducing the pressure regulation rate at the position where the diameter of the oil pipeline changes; The pressure regulation rate is negatively correlated with the flow rate change.

5. The desulfurization method of organic liquid for removing hydrogen sulfide in oil and gas fields according to claim 4, characterized in that: Adjusting the input flow rate of the extract when inputting the desulfurization liquid membrane pipeline includes: Comparing the flow rate change with the preset first flow rate change and the preset second flow rate change respectively; If the flow rate change is greater than the preset first flow rate change and less than or equal to the preset second flow rate change, it is preliminarily determined that the fluidity of the hydrogen sulfide oil to be extracted does not meet the requirements, and the temperature of the input position of the desulfurization liquid membrane pipeline is obtained; Comparing the temperature of the input position of the desulfurization liquid membrane pipeline with the preset second temperature; If the temperature at the input position of the desulfurization liquid membrane pipeline is lower than the second preset temperature, it is determined that the fluidity of the hydrogen sulfide oil to be extracted does not meet the requirements, and the input flow rate of the extracting liquid when inputting the desulfurization liquid membrane pipeline is reduced.

6. The desulfurization method of organic liquid for removing hydrogen sulfide in oil and gas fields according to claim 5, characterized in that: The input flow rate is directly related to the temperature.

7. The desulfurization method of an organic liquid for removing hydrogen sulfide in an oil and gas field according to claim 6, characterized in that: The cleaning cycle of the desulfurization liquid membrane pipeline is determined according to the maximum pressure change of the inner wall of the desulfurization liquid membrane pipeline, including: Comparing the temperature of the input position of the desulfurization liquid membrane pipeline with the preset first temperature and the preset second temperature respectively; If the temperature at the input position of the desulfurization liquid membrane pipeline is greater than the preset second temperature and less than or equal to the preset first temperature, it is preliminarily determined that the deposition degree of the desulfurization liquid membrane pipeline does not meet the requirements, and the maximum value of the pressure change per unit length of the inner wall of the desulfurization liquid membrane pipeline is obtained and recorded as the maximum pressure change; Comparing the maximum pressure change with a preset pressure change; If the maximum pressure change is greater than the preset pressure change, it is determined that the deposition degree of the desulfurization liquid membrane pipeline does not meet the requirements, and the cleaning cycle of the desulfurization liquid membrane pipeline is increased; The pressure change is the difference between the pressure at the starting position of a unit length of the inner wall of the desulfurization liquid membrane pipeline in the axial direction and the pressure at the end position of the unit length.

8. The desulfurization method of an organic liquid for removing hydrogen sulfide in an oil and gas field according to claim 7, characterized in that: The cleaning period is positively correlated with the maximum pressure change.

9. The desulfurization method of organic liquid for removing hydrogen sulfide in oil and gas fields according to claim 8, characterized in that: Determining the inflow angle of the extract from the liquid infusion pipe into the desulfurization liquid membrane pipeline according to the vibration intensity includes: comparing the vibration intensity with a preset vibration intensity; If the vibration intensity is less than the preset vibration intensity, it is determined that the extraction turbulence degree does not meet the requirements, and the inflow angle of the extraction liquid is reduced; Among them, the inflow angle of the extract is the acute angle formed by the axial diameter of the liquid infusion pipe and the desulfurization liquid membrane pipeline.

10. The desulfurization method of organic liquid for removing hydrogen sulfide in oil and gas fields according to claim 9, characterized in that: The inflow angle is positively correlated with the vibration intensity.

Images