CN115671798A - Dehydration process for crude oil produced liquid and aged oil - Google Patents
Dehydration process for crude oil produced liquid and aged oil Download PDFInfo
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Abstract
The invention belongs to the technical field of dehydration of produced liquid and dehydration of aging oil of an oilfield ground produced liquid treatment system, and particularly relates to a dehydration process of crude oil produced liquid and aging oil. The dehydration process is characterized in that a tubular mixer is additionally arranged between a first-stage settling tank and a second-stage settling tank in the conventional crude oil dehydration treatment (combined station), one end of the tubular mixer is connected with an oil phase outlet of the first-stage settling tank and a filtered water outlet of the second-stage settling tank, and the other end of the tubular mixer is connected with an inlet of the second-stage settling tank. Solves the problems of large dosage, high energy consumption, long settling time and the like of the demulsifier in the conventional treatment of aging oil, acidified oil and conventional thickened oil in a crude oil dehydration system.
Description
Technical Field
The invention belongs to the technical field of dehydration treatment of thickened oil and aging oil of a ground produced fluid treatment system, and particularly relates to a dehydration process of crude oil produced fluid and aging oil.
Background
The crude oil is extracted from a single well and then conveyed to a combined station through a ground gathering and transporting system for crude oil dehydration treatment, the conventional crude oil dehydration treatment process of the combined station generally comprises the steps of enabling gathering and transporting incoming liquid to enter a two-phase or three-phase separator for gas-liquid separation, enabling the liquid phase to enter a first-section settling tank for primary oil-water separation after heating or directly entering a heating furnace for heating, enabling an oil phase to enter a second-section settling tank for further oil-water separation before or after heating, and enabling separated purified oil to enter a purification oil tank for outcrossing of qualified crude oil.
During the process of crude oil production, physical properties of a bottom layer and crude oil are changed by means of acidification, fracturing, steam (SAGD) and the like, so that the recovery efficiency is improved, and the difficulty of dehydration of the produced crude oil is increased by implementing the production increasing measures. The essential reason influencing the crude oil treatment difficulty is that an oil-water interface film in crude oil emulsion is more stable, and the conventional treatment method is to reduce the water content in the treated crude oil by taking measures of increasing the treatment temperature, increasing the dosage of a demulsifier or prolonging the crude oil settling time and the like.
For example, chinese patent No. 103820143B discloses a demulsifying and dehydrating agent for treating aged heavy oil, comprising diammonium phosphate and water mixed in an arbitrary ratio. The demulsifying and dehydrating agent prepared by the invention has simple composition, convenient operation and low cost, and is suitable for various aged crude oils with different oil qualities. The dosage of the demulsifying dehydrating agent added into the aged thickened oil is 450-500 mg/L, the water content of the aged oil after dehydration is less than 2.0%, and the oil content of the sewage is less than 600mg/L, thereby achieving the industrial standard. The invention also provides a preparation method thereof, which comprises the steps of firstly injecting water into the enamel reaction kettle, then adding diammonium phosphate into the reaction kettle, stirring and adding until the diammonium phosphate is completely dissolved, thus obtaining the demulsification dehydrating agent for treating the aged thickened oil. The process is reasonable and simple, and is easy for industrial production.
Chinese patent application CN107418617A discloses a chemical treatment method for heavy high acid emulsified aged crude oil. The chemical treatment method comprises the following steps: preparing an emulsion of heavy high-acid emulsified aged crude oil; adding a composite complexing agent and a demulsifier into the emulsion, and performing thermal sedimentation to realize dehydration treatment on the heavy high-acid emulsified aged crude oil; the heavy high-acid emulsified aged crude oil refers to the crude oil which is difficult to treat and is generated in the oil extraction and oil refining processes; the mass water content of the emulsion is 15-60%. The method has the advantages of convenient operation, simple process, strong applicability, low cost, environmental friendliness and the like, the water content of the treated aged crude oil is less than 1 percent, the normal output standard and the processing requirement of the crude oil can be met, the potential safety hazard and the environmental hazard caused by aged dirty oil can be obviously reduced, and the economic benefit, the environmental benefit and the social benefit are very obvious.
Although the above dehydration treatment method has a good treatment effect, these treatment measures inevitably increase the energy consumption and the chemical cost of crude oil treatment or reduce the treatment efficiency of the system.
Disclosure of Invention
In order to overcome the technical problems, the invention provides a crude oil produced liquid and aging oil dehydration process, which solves the problems of large dosage, high energy consumption, long settling time and the like of a demulsifier in the conventional treatment of aging oil, acidified oil and conventional thickened oil of a crude oil dehydration system.
In order to achieve the above purpose, the technical scheme provided by the invention is as follows:
a dehydration process of crude oil produced liquid and aged oil comprises the following steps:
in the conventional crude oil dehydration treatment (combined station) process, a tubular mixer is additionally arranged between a first-stage settling tank and a second-stage settling tank, one end of the tubular mixer is connected with an oil phase outlet of the first-stage settling tank and a filtered water outlet of the bottom of the second-stage settling tank, and the other end of the tubular mixer is connected with an inlet of the second-stage settling tank.
Preferably, the oil phase outlet pipeline of the first section of the settling tank is connected with a heating furnace, the inlet pipeline of the heating furnace is connected with the oil phase outlet of the first section of the settling tank, and the outlet pipeline of the heating furnace is connected with the tubular mixer.
Preferably, a branch line is separated from a pipeline between the tubular mixer and the first-stage settling tank, a filter and a centrifugal pump are sequentially connected in series on the branch line, the other end of the branch line is communicated with the middle lower part of the second-stage settling tank, and the filter and the centrifugal pump which are connected in series on the branch line are connected in series with the tubular mixer.
Preferably, the upper part of the second-stage settling tank is an oil layer, and an outlet of the oil layer is connected to the purified oil tank through a pipeline; the middle lower part of the second-stage settling tank is a water layer, the water outlet of the water layer of the second-stage settling tank sequentially passes through a centrifugal pump and a filter, and is filtered to obtain filtered water at the bottom of the second-stage settling tank, the filtered water at the bottom of the second-stage settling tank is conveyed to a tubular mixer by the pump under the action of the centrifugal pump, and the filtered water at the bottom of the second-stage settling tank and the oil phase output by the first-stage settling tank are fully stirred by the tubular mixer and then enter the second-stage settling tank for settling.
Preferably, when the filtered water at the bottom of the second-stage sedimentation tank is back-mixed with the oil phase output by the first-stage sedimentation tank, the back-mixing proportion of free water is controlled to be 20-80%.
Wherein, the free water mixing proportion refers to: the filtered water at the bottom of the second-stage sedimentation tank/(the filtered water at the bottom of the second-stage sedimentation tank + the total volume of the mixed oil discharged from the first-stage sedimentation tank) is fully used for back mixing.
Preferably, the dehydration treatment process of the crude oil dehydration treatment process comprises the following steps:
(1) Separating crude oil produced liquid or aged oil incoming liquid by a two-phase or three-phase separator, and then feeding the separated crude oil produced liquid or aged oil incoming liquid into a first-stage settling tank;
(2) Treating the wastewater by a first-stage settling tank and a heating furnace to obtain a first-stage settling treatment liquid, and then feeding the first-stage settling treatment liquid into a second-stage settling tank through a pipe type mixer;
(3) The produced liquid treated by the second-stage settling tank is divided into two parts, the upper part is a purified oil phase, and the purified oil phase is discharged into a purified oil tank through a pipeline; the middle lower part is separated water phase which is divided into two parts, one part of the water phase is pumped into a tubular mixer after being filtered (the part of the water is filtered water at the bottom of a second-stage sedimentation tank), is mixed with first-stage sedimentation treatment liquid, enters the second-stage sedimentation tank again for treatment after being treated by the tubular mixer, and the other part of the water phase is discharged to a sewage treatment system as waste water (the waste water after the second-stage sedimentation);
wherein, when the filtered water at the bottom of the second-stage sedimentation tank is back-mixed with the oil phase output by the first-stage sedimentation tank, the back-mixing proportion of the free water is controlled to be 20-80%.
Preferably, a demulsifier dosing pump is added between the oil phase outlet of the first-stage settling tank and the inlet of the heating furnace.
Preferably, the demulsifier is polyether, and the dosage is 100-200 mg/L.
Compared with the prior art, the invention has the technical advantages that:
(1) The invention utilizes the emulsion diversion mechanism, and artificially mixes a certain proportion of free water to transform the original water-in-oil emulsion to form an oil-in-water emulsion, and simultaneously, because of the mixing of the free water, the invention generates 'physical impact force' on the original emulsion interface film and is beneficial to the breakdown of a stable interface film, thereby facilitating the rupture of the film, achieving the coalescence of emulsified water, and achieving the qualified dehydration of the crude oil of the emulsion by adding the chemical demulsification performance of the demulsifier. Therefore, when the filtered water at the bottom of the second-stage settling tank is back-mixed with the crude oil emulsion at the first-stage outlet, the back-mixing proportion of the free water is controlled to be 20-80% according to the water content condition of the crude oil emulsion at the first-stage outlet, and the filtered water at the bottom of the other second-stage settling tank is discharged to a sewage treatment system as wastewater.
(2) The dehydration system has the advantages of low energy consumption and short settling time, and can reduce the silt content in the purified oil.
(3) The dehydration treatment process has good treatment effect, and solves the problems of large dosage, high energy consumption, long settling time and the like of the demulsifier in the conventional treatment of the aging oil, the acidified oil and the conventional thickened oil of the crude oil dehydration system. And a better oil-water separation effect can be obtained on the premise of reducing the using amount of the demulsifier.
Drawings
FIG. 1: a flow chart of a conventional dehydration treatment process;
FIG. 2: the invention relates to a dehydration treatment process flow chart;
FIG. 3: the dewatering effect of the aged oil in example 1 and comparative example 1 is compared; wherein a is the dewatering effect of example 1, and b is the dewatering effect of comparative example 1;
the specific meanings of the symbols in the drawings are as follows: 1: crude oil produced liquid or aged oil coming liquid; 2: removing the natural gas from the associated gas by using a natural gas treatment device; 3: a two-phase or three-phase separator; 4: a first-stage settling tank; 5: a demulsifier dosing pump; 6: heating furnace; 7: a second-stage settling tank; 8: purifying the oil tank; 9: a tubular mixer; 10: a filter; 11: a centrifugal pump;
wherein, A-G respectively represent liquid in the pipeline, A is liquid treated by a two-phase or three-phase separator; b is an oil phase after primary sedimentation; c is the waste water after the first-stage sedimentation; d is the filtered water at the bottom of the two-section sedimentation tank; e is a mixed solution of the oil phase after the first-stage sedimentation and the filtered water at the bottom of the second-stage sedimentation tank; f is purified oil; g is the waste water after the second-stage sedimentation.
The invention will now be further illustrated with reference to the accompanying drawings and examples:
Detailed Description
The present invention will be described below with reference to specific examples to make the technical aspects of the present invention easier to understand and grasp, but the present invention is not limited thereto. The experimental methods described in the following examples are all conventional methods unless otherwise specified; the reagents and materials are commercially available, unless otherwise specified.
Basic embodiment
(1) Separating crude oil produced liquid or aged oil incoming liquid by a two-phase or three-phase separator, and then feeding the separated crude oil produced liquid or aged oil incoming liquid into a first-stage settling tank;
(2) The first-stage sedimentation treatment liquid is obtained after the first-stage sedimentation treatment liquid is treated by a first-stage sedimentation tank and a heating furnace, and then enters a second-stage sedimentation tank through a pipe type mixer (a pipe mixer);
(3) The produced liquid treated by the two-stage settling tank is divided into two parts, the upper part is a purified oil phase, the oil phase is discharged into a purified oil tank through a pipeline, and the middle lower part is a separated water phase; the water phase is divided into two parts, one part of the water phase is filtered and then is pumped into a tubular mixer (the part of the water is filtered water at the bottom of a second-stage sedimentation tank), the water phase is mixed with first-stage sedimentation treatment liquid, the mixture enters the second-stage sedimentation tank again for treatment after being treated by the tubular mixer, and the other part of the water phase is discharged to a sewage treatment system as wastewater;
wherein, when the filtered water at the bottom of the second-stage sedimentation tank is back-mixed with the oil phase output by the first-stage sedimentation tank, the back-mixing proportion of the free water is controlled to be 20-80%.
In addition, a demulsifier dosing pump is added between the oil phase outlet of the first section of the settling tank and the inlet of the heating furnace.
The dehydration process of the invention adopts different treatment objects to evaluate the treatment effect of the process, and the specific details are shown in examples 1-4.
Example 1
The type of liquid coming in: aged thickened oil (water content 55%);
the treatment process comprises the following steps: adding an FTK-18 demulsifier of Xinhope chemical Co Ltd in Binzhou city into the aged thick oil at the outlet of the first-stage settling tank, wherein the adding amount is 200mg/L, heating the mixture to 80 ℃ by a phase-change furnace, mixing the mixture with the bottom water of the second-stage settling tank by a pipe mixer according to the proportion of 4, feeding the mixture into the second-stage settling tank for settling, simultaneously sampling the outlet of the pipe mixer, putting the mixture into a test tube, observing the volume of dehydrated water in the test tube which increases with time, and observing the dehydration effect when dehydrating for 2h (see a in figure 3). The dehydration rate calculation method comprises the following steps: (dehydrated volume-free water volume) ÷ (oil mass x water content). And (5) taking 20g of upper layer purified oil, and measuring the water content in the oil by using a distillation method.
Example 2
The type of liquid coming in: acidized thickened oil (the water content is 32.6%);
the treatment process comprises the following steps: and adding an FTK-18 demulsifier of Xinhope chemical engineering Co Ltd in Binzhou city into the acidified thick oil at the outlet of the first-stage settling tank, wherein the adding amount is 200mg/L, heating the acidified thick oil to 80 ℃ by a phase-change furnace, mixing the acidified thick oil with the bottom water of the second-stage settling tank by a pipe mixer in a ratio of 3. The dehydration rate calculation method comprises the following steps: (dehydrated volume-free water volume) ÷ (oil mass x water content). And (5) taking 20g of upper layer purified oil and measuring the water content in the oil by a distillation method.
Example 3
The type of liquid coming in: conventional thickened oil (water content 20%);
the treatment process comprises the following steps: adding an FTK-18 demulsifier of Xinhope chemical Co Ltd in Bizhou city into the conventional thick oil at the outlet of the first-stage settling tank, wherein the adding amount is 200mg/L, heating the mixture to 80 ℃ by a phase-change furnace, mixing the mixture with the bottom water of the second-stage settling tank in a ratio of 3. The dehydration rate calculation method comprises the following steps: (dehydrated volume-free water volume) ÷ (oil mass x water content). And (5) taking 20g of upper layer purified oil and measuring the water content in the oil by a distillation method.
Example 4
The type of liquid coming in: aged thin oil (water content 50%);
the treatment process comprises the following steps: adding a SB-05 demulsifier of Xinjiang Korea New technology development Limited company into the aged thin oil at the outlet of the first-stage settling tank, wherein the adding amount is 100mg/L, heating the mixture to 60 ℃ by a phase-change furnace, mixing the mixture with the bottom water of the second-stage settling tank by a pipe mixer in a ratio of 4, then allowing the mixture to enter the second-stage settling tank for settling, simultaneously sampling the outlet of the pipe mixer, putting the mixture into a test tube, and observing the volume of water removed from the test tube along with the increase of time. The dehydration rate calculation method comprises the following steps: (dehydrated volume-free water volume) ÷ (oil mass x water content). And (5) taking 20g of upper layer purified oil and measuring the water content in the oil by a distillation method.
Comparative example 1
The only difference from example 1 is the use of a conventional dehydration process.
The type of liquid coming in: aged thick oil (water content 55%) as in example 1;
the treatment process comprises the following steps: adding an FTK-18 demulsifier of Xinhope chemical Co., ltd, binzhou city into the aged thick oil at the outlet of the first-stage settling tank, wherein the adding dosage is 200mg/L, heating the mixture to 80 ℃ by a phase-change furnace, allowing the mixture to enter a second-stage settling tank for settling, sampling at the inlet of the second-stage settling tank, observing the volume of the water removed from a demulsification test tube along with the increase of time, and observing the dehydration effect when the water is dehydrated for 2 hours (see b in figure 3). The dehydration rate calculation method comprises the following steps: (dehydrated volume) ÷ (oil quality × water content). And (5) taking 20g of upper layer purified oil and measuring the water content in the oil by a distillation method.
Comparative example 2
The only difference from example 2 is the use of a conventional dehydration process.
The type of liquid coming: the same acidified thick oil of example 2 (water content 32.6%);
the treatment process comprises the following steps: and (3) adding an FTK-18 demulsifier of Xinhope chemical engineering Co., ltd, binzhou city into the acidified thick oil at the outlet of the first-stage settling tank, wherein the adding amount is 200mg/L, heating the mixture to 80 ℃ by a phase-change furnace, allowing the mixture to enter a second-stage settling tank for settling, and sampling and observing at the inlet of the second-stage settling tank to increase the volume of the dehydrated water in a demulsification test tube along with time. The dehydration rate calculation method comprises the following steps: (dehydrated volume) ÷ (oil quality × water content). And (5) taking 20g of upper layer purified oil and measuring the water content in the oil by a distillation method.
Comparative example 3
The only difference from example 3 is the use of a conventional dehydration process.
The type of liquid coming in: the same as the conventional thickened oil (water content is 20%) of example 3;
the treatment process comprises the following steps: adding an FTK-18 demulsifier of Xinhope chemical engineering Co., ltd, binzhou city into the conventional thickened oil at the outlet of the first-stage settling tank, wherein the adding amount is 200mg/L, heating the mixture to 80 ℃ by a phase-change furnace, allowing the mixture to enter a second-stage settling tank for settling, and sampling and observing at the inlet of the second-stage settling tank to increase the volume of dehydrated water in a demulsification test tube along with time. The dehydration rate calculation method comprises the following steps: (volume dehydrated) ÷ (oil quality x water content). And (5) taking 20g of upper layer purified oil and measuring the water content in the oil by a distillation method.
Comparative example 4
The only difference from example 4 is the use of a conventional dehydration process.
The type of liquid coming: the same aged thin oil (water content 50%) as in example 4;
the treatment process comprises the following steps: adding SB-05 demulsifier from Xinjiang Keli new technology development Limited company into the aged thin oil at the outlet of the first-stage settling tank, wherein the dosage is 100mg/L, heating the mixture to 60 ℃ by a phase-change furnace, allowing the mixture to enter a second-stage settling tank for settling, and sampling at the inlet of the second-stage settling tank to observe the volume of water removed from a demulsification test tube which increases with time. The dehydration rate calculation method comprises the following steps: (dehydrated volume) ÷ (oil quality × water content). And (5) taking 20g of upper layer purified oil, and measuring the water content in the oil by using a distillation method.
Evaluation of Effect
The experimental method comprises the following steps: SY/T5281-2000 is adopted for demulsification evaluation, and GB/T260-2016 is adopted for crude oil water content determination. The water contents after the dehydration treatment of examples and comparative examples were measured, and the results are shown in Table 1.
TABLE 1 comparison of dewatering results
Therefore, the dehydration process of the crude oil produced liquid and the aging oil provided by the invention has a good dehydration treatment effect.
The above detailed description is directed to one of the possible embodiments of the present invention, which is not intended to limit the scope of the invention, but rather the scope of the invention is intended to include all equivalent implementations or modifications without departing from the scope of the invention.
Claims (8)
1. A dehydration process of crude oil produced liquid and aged oil comprises the following steps:
in the conventional crude oil dehydration treatment process, a tubular mixer is additionally arranged between a first-stage settling tank and a second-stage settling tank, one end of the tubular mixer is connected with an oil phase outlet of the first-stage settling tank and a filtered water outlet at the bottom of the second-stage settling tank, and the other end of the tubular mixer is connected with an inlet of the second-stage settling tank.
2. The dehydration process according to claim 1, wherein a heating furnace is connected to an outlet pipeline of the oil phase outlet of the first settling tank, an inlet pipeline of the heating furnace is connected to the oil phase outlet of the first settling tank, and an outlet pipeline of the heating furnace is connected to the tubular mixer.
3. A dewatering process as claimed in claim 1, wherein the line between the tube mixer and the first settling tank is split into a branch line, a filter and a centrifugal pump are connected in series in the branch line, the other end of the branch line is connected to the lower and middle part of the second settling tank, and the filter and centrifugal pump connected in series in the branch line are connected in series with the tube mixer.
4. A dewatering process according to claim 3, wherein an oil layer is located in the upper part of the second settling tank, and an outlet of the oil layer is connected to the clean oil tank through a pipeline; the middle-lower part of the second-stage sedimentation tank is a water layer, water outlet water of a water layer outlet of the second-stage sedimentation tank sequentially passes through a centrifugal pump and a filter, filtered water at the bottom of the second-stage sedimentation tank is obtained through filtering, the filtered water at the bottom of the second-stage sedimentation tank is conveyed to a tubular mixer through the centrifugal pump under the action of the centrifugal pump, and the filtered water at the bottom of the second-stage sedimentation tank and oil phase output by the first-stage sedimentation tank are fully stirred through the tubular mixer and then enter the second-stage sedimentation tank for sedimentation.
5. The dewatering process according to claim 4, wherein when the filtered water in the second settling tank is back-mixed with the oil phase output from the first settling tank, the back-mixed ratio of free water is controlled to be 20-80%.
6. The dehydration process of claim 5, comprising the steps of:
(1) Separating crude oil produced liquid or aging oil incoming liquid by a two-phase or three-phase separator, and then entering a first-stage settling tank;
(2) Treating the wastewater by a first-stage settling tank and a heating furnace to obtain a first-stage settling treatment liquid, and then feeding the first-stage settling treatment liquid into a second-stage settling tank through a pipe type mixer;
(3) The produced liquid treated by the second-stage settling tank is divided into two parts, the upper part is a purified oil phase, and the purified oil phase is discharged into a purified oil tank through a pipeline; the middle-lower part is separated water phase which is divided into two parts, one part of the water phase is pumped into a tubular mixer after being filtered, is mixed with the first-stage sedimentation treatment liquid, enters a second-stage sedimentation tank again for treatment after being treated by the tubular mixer, and the other part of the water phase is discharged to a sewage treatment system as waste water.
7. The dehydration process of claim 6, wherein a demulsifier dosing pump is added between the oil phase outlet of said primary settling tank and the inlet of the furnace.
8. A dewatering process as claimed in claim 6, wherein the demulsifier is a polyether and is added in an amount of 100-200 mg/L.
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