CN120211695B - A stable gathering and transportation system and method for oilfield salt crystal produced fluid - Google Patents
A stable gathering and transportation system and method for oilfield salt crystal produced fluidInfo
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- CN120211695B CN120211695B CN202510702943.7A CN202510702943A CN120211695B CN 120211695 B CN120211695 B CN 120211695B CN 202510702943 A CN202510702943 A CN 202510702943A CN 120211695 B CN120211695 B CN 120211695B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/34—Arrangements for separating materials produced by the well
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/34—Arrangements for separating materials produced by the well
- E21B43/35—Arrangements for separating materials produced by the well specially adapted for separating solids
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- Engineering & Computer Science (AREA)
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- Mining & Mineral Resources (AREA)
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- Environmental & Geological Engineering (AREA)
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- General Life Sciences & Earth Sciences (AREA)
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- Extraction Or Liquid Replacement (AREA)
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Abstract
The invention relates to a stable collecting and delivering system and a method for salt-containing crystal produced liquid in an oil field, wherein the stable collecting and delivering system for salt-containing crystal produced liquid in the oil field comprises a piston cylinder body, a piston, a one-way valve, a centrifugal machine, a communicating pipe and a joint station, and the side wall of the piston cylinder body is communicated with a produced liquid outlet of an oil well christmas tree through the communicating pipe with the one-way valve; the bottom of the piston cylinder body is provided with a liquid outlet which is communicated with a centrifugal machine inlet with a freezing function through a liquid pipeline, a piston is arranged in a cavity of the piston cylinder body and is connected with a piston connecting rod, the piston connecting rod extends out of the upper end of the piston cylinder body and can drive the piston to move up and down to open or block the liquid outlet so as to push fluid in the piston cylinder body to flow to the centrifugal machine, the centrifugal machine outlet is connected with a pipeline which is conveyed to a combined station through a pipeline, the combined station is connected with a water-containing crude oil storage tank through a pipeline, the water-containing crude oil storage tank is respectively connected with a finished crude oil tank and a water tank, and the sewage tank is sequentially connected with a sewage treatment system and water evaporation equipment through pipelines.
Description
Technical Field
The invention relates to the technical field of oil fields, in particular to a stable collecting and conveying system and method for salt-containing crystal produced liquid of an oil field.
Background
Because the characteristics of a reservoir are limited in a certain oil field, the concentration of sodium carbonate and sodium bicarbonate in produced water contained in produced liquid is too high, the concentration can reach 13% -25%, the total degree of mineralization is 25% -45 ten thousand mg/L, after the produced liquid is lifted to the ground from the oil field, dissolved salt in the produced water can be separated out due to the change of the existing state, and pipeline blockage caused by salt crystallization occurs in a pipeline, so that the development of the oil field is seriously influenced.
To solve the above problems, it is necessary to inhibit crystallization of sodium bicarbonate and sodium carbonate at the wellhead by a suitable method. The method for inhibiting the crystallization of the crystal generally comprises the steps of 1, reducing the salt concentration to be lower than the saturation concentration, 2, adding a salt crystallization inhibitor to prevent salt crystals from precipitating, and 3, increasing the temperature to improve the salt solubility. Both of the above methods are difficult to achieve due to the well head desalting effect on the technical system.
Disclosure of Invention
The invention provides a stable collecting and transporting system and method for salt-containing crystal produced liquid in an oil field, which aims at solving one or more technical problems in the prior art.
The technical scheme includes that the oil field salt-containing crystal produced liquid stable gathering and conveying system comprises a piston cylinder body, a piston, a one-way valve, a centrifugal machine, a communicating pipe and a joint station, wherein the side wall of the piston cylinder body is communicated with a produced liquid outlet of an oil well christmas tree through the communicating pipe with the one-way valve, a liquid outlet is formed in the bottom of the piston cylinder body and is communicated with an inlet of the centrifugal machine with a freezing function through a liquid pipeline, the piston is arranged in a cavity of the piston cylinder body and is connected with a piston connecting rod, the piston connecting rod extends out of the upper end of the piston cylinder body and can drive the piston to move up and down to open or block the liquid outlet, fluid in the piston cylinder body is pushed to flow to the centrifugal machine, the outlet of the centrifugal machine is connected and communicated with a pipeline which is connected with a water-containing crude oil storage tank through a pipeline, the water-containing storage tank is connected and communicated with a finished crude oil tank and a water tank respectively, a sewage tank is connected with a sewage treatment system through a pipeline, and a water outlet of the sewage treatment system is connected with a water evaporation device and communicated with the sewage treatment system.
The oil field salt-containing crystal produced liquid stable gathering and conveying system and method have the advantages that an oil pumping unit ascends to lift an oil-water mixture at the bottom of an oil well to the ground, after water-containing crude oil at the wellhead of the oil well is produced, a one-way valve arranged on a connecting pipe line connected with an oil production outlet of a christmas tree is opened, produced liquid enters a piston cylinder body through the connecting pipe, a piston in the piston cylinder body moves upwards under the driving of a piston connecting rod, a space is reserved for a solid-liquid mixture produced from the oil well to smoothly enter the piston cylinder body, and when the oil pumping unit descends (does not lift an oil-water mixture of the oil well), the piston pushes the oil well produced liquid entering the piston cylinder body downwards under the pushing of the piston connecting rod to enter a centrifuge with a freezing function, and the one-way valve is closed in the pushing process of the piston to the centrifuge, so that the oil-water mixture in the piston cylinder body is prevented from entering the oil well again through the connecting pipe. The centrifugal machine can be utilized to separate salt crystals from the oil-water mixture in the oil-water mixture, so that the influence of the salt crystals on the collection and transportation stability of the produced liquid is eliminated, and the stable continuous collection and transportation of the produced liquid of the oil field can be realized. After the produced liquid is subjected to solid-liquid separation by a centrifugal machine, the separated liquid enters a pipeline which is conveyed to a joint station after adding a salt crystallization inhibitor for subsequent oil-water separation, water treatment and slag treatment.
On the basis of the technical scheme, the invention can be improved as follows.
Further, the centrifuge is located directly below the piston cylinder.
The oil-water mixture in the piston cylinder body can smoothly enter the centrifugal machine by arranging the centrifugal machine right below the piston cylinder body.
Further, the piston cylinder body and the oil well christmas tree are arranged side by side, and the inner cavity volume of the piston cylinder body is 1.2-1.5 times of rated flow of the pumping unit.
The beneficial effect of adopting the further scheme is that enough accommodation space is provided for each lifting fluid, and the backflow of the fluid lifted each time is avoided.
Further, the check valve is an interlocking check valve.
Further, the communicating pipe is arranged at a position, close to the upper end, of the piston cylinder body, the communicating pipe is transversely arranged or obliquely arranged, and when the communicating pipe is obliquely arranged, one end, connected with the piston cylinder body, of the communicating pipe is lower than one end, connected with the oil well christmas tree, of the communicating pipe.
Further, the outer diameter of the piston is smaller than the inner diameter of the piston cylinder body, an upper sealing gasket is arranged on the end face of the upper end of the piston, a lower sealing gasket is arranged on the end face of the lower end of the piston, and the piston connecting rod is in sealing movable connection with the upper end of the piston cylinder body.
The further scheme has the beneficial effect of avoiding the influence on the normal use of the piston caused by precipitation of salt between the peripheral side of the piston and the piston cylinder body. Sealing gaskets are arranged on the upper end face and the lower end face of the piston, so that sealing and abutting connection between the piston and the piston cylinder body are facilitated.
The stable oilfield produced liquid gathering and conveying method is realized by adopting the stable oilfield salt-containing crystal produced liquid gathering and conveying system, and comprises the following steps of:
s1, in the upward lifting process of the produced liquid from an oil well through the oil pumping unit, the one-way valve is opened, the produced liquid enters the piston cylinder body through the communicating pipe with the one-way valve, and when the produced liquid enters the piston cylinder body, the piston moves upwards under the drive of the piston connecting rod, and the produced liquid smoothly enters a space below the piston;
S2, cooling produced liquid by a centrifugal machine, performing solid-liquid separation, adding salt crystallization inhibitor into the separated liquid, then entering a water-containing crude oil tank of a joint station, mixing the water-containing crude oil tank with a demulsifier, performing oil-water separation, entering separated crude oil into a finished crude oil storage tank, flocculating and filtering the separated produced water, and then entering water evaporation equipment for evaporation and concentration;
s3, mixing the waste salt generated after evaporation of the produced water with solid salt slag separated by a centrifugal machine, and then feeding the mixture into waste salt calcining equipment to be calcined to form coarse sodium carbonate salt, wherein the coarse sodium carbonate salt can be used as a material for tertiary oil recovery liquid preparation or a solid fire extinguishing agent raw material, and the water phase generated by evaporation of the produced water is recycled after being treated.
The method has the beneficial effects that the method can realize stable continuous gathering and transportation of the oil well produced liquid, can carry out subsequent treatment on the produced liquid, and realizes oil-water separation and recycling of slag salt and water phase.
Further, the concentration of the salt crystallization inhibitor is 50-300 mg/L.
In S2, the flocculant for flocculation of the produced water is PAC and PAM, the addition amount of the PAC is 200-400 mg/L, the addition amount of the PAM is 5-15 mg/L, the cationic degree of the PAM is 5% -25%, and the molecular weight range of the PAM is 800-1600 ten thousand.
In S2, the filter for filtering the produced water comprises a three-stage filter consisting of 0.3-0.5 mm granular quartz sand, modified fiber balls and an ultrafiltration filter.
Drawings
FIG. 1 is a schematic diagram of the structural principle of the oilfield salt-containing crystal produced fluid stable gathering and transporting system;
FIG. 2 is a schematic diagram of the process flow of the oilfield salt-containing crystal produced fluid stabilization gathering and transportation system of the invention.
In the drawings, the list of components represented by the various numbers is as follows:
1. The oil pumping unit comprises a piston cylinder body, an infusion tube, a piston connecting rod, a one-way valve, a centrifugal machine, a communicating tube, a sucker rod, an oil well christmas tree, an oil pumping unit and an oil pumping unit.
Detailed Description
The principles and features of the present invention are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.
As shown in FIG. 1, the stable oilfield salt-containing crystal produced liquid collecting and transporting system comprises a piston cylinder body 1, a piston 2, a one-way valve 3, a centrifugal machine 4, a communicating pipe 5 and a joint station, wherein the side wall of the piston cylinder body 1 is communicated with a produced liquid outlet of an oil well christmas tree through the communicating pipe 5, the communicating pipe 5 is provided with the one-way valve 3, the bottom of the piston cylinder body 1 is provided with a liquid outlet, the liquid outlet is communicated with an inlet of the centrifugal machine 4 with a freezing function through a liquid pipeline, the piston 2 is arranged in a cavity of the piston cylinder body 1 and is connected with a piston connecting rod 21, the piston connecting rod 21 extends out from the upper end of the piston cylinder body 1 and can drive the piston 2 to move up and down to open or block the liquid outlet, so as to push fluid in the piston cylinder body 1 to flow to the centrifugal machine 4, the outlet of the centrifugal machine 4 is connected and communicated with a pipeline of the joint station through a pipeline, the joint station is connected with a water-containing crude oil storage tank through a pipeline, the water-containing crude oil tank is connected and communicated with a finished crude oil tank and a water tank through a pipeline, the sewage tank is connected with a sewage treatment system through a pipeline, and a water outlet of the sewage treatment system is connected with a water evaporation device.
As shown in fig. 1, in a preferred embodiment of the present embodiment, the centrifuge 4 is located directly below the piston cylinder 1. The centrifugal machine is arranged right below the piston cylinder body, so that the oil-water mixture in the piston cylinder body can smoothly enter the centrifugal machine.
As shown in fig. 1, in a preferred embodiment, the outer diameter of the piston 2 is smaller than the inner diameter of the piston cylinder 1. The problem that salt is separated out between the periphery of the piston and the piston cylinder body to influence the normal use of the piston is avoided.
Preferably, the check valve 3 is an interlocking check valve.
Alternatively, as shown in fig. 1, the communicating pipe 5 is arranged transversely or obliquely, and when the communicating pipe 5 is arranged obliquely, one end of the communicating pipe 5 connected with the piston cylinder 1 is lower than one end of the communicating pipe 5 connected with the oil well christmas tree 7.
As shown in fig. 1, in particular, the communication pipe 5 is provided at a position of the piston cylinder 1 near the upper end.
Preferably, an upper sealing gasket is arranged on the upper end face of the piston 2 in the embodiment, a lower sealing gasket is arranged on the lower end face of the piston 2, both the upper sealing gasket and the lower sealing gasket can be fluororubber gaskets, and the piston connecting rod 21 is movably connected with the upper end of the piston cylinder body 1 in a sealing manner. Sealing gaskets are arranged on the upper end face and the lower end face of the piston, so that sealing and abutting connection between the piston and the piston cylinder body are facilitated. Wherein, upper sealing pad and lower sealing pad are annular.
The sucker rod 6 and the pumping unit 8 are arranged in the oil well christmas tree 7 of the embodiment, the pumping unit 8 is in transmission connection with the sucker rod 6, the sucker rod 6 is arranged in the oil well christmas tree 7, and the sucker rod 6 is driven by a machine to drive a linkage oil pump to lift fluid (produced liquid) in an oil well to the communicating pipe 5 upwards through a produced liquid output port connected with the oil well christmas tree 7.
As shown in fig. 1, in this embodiment, the piston cylinder 1 and the christmas tree 7 are arranged side by side, and the volume of the inner cavity of the piston cylinder 1 is 1.2-1.5 times the rated flow rate (rated flow rate of the oil removing machine) of the oil pumping unit 8. In this way, enough accommodation space can be provided for each lifting fluid, and the backflow of the fluid lifted each time is avoided.
Specifically, in this embodiment, the piston rod 21 may be connected to a driving device composed of a motor and a speed reducer, when the sucker rod 6 is electrically driven by the pumping unit 8 (motor+speed reducer) to move upwards, the piston rod 21 drives the piston 2 to move upwards rapidly to the uppermost end of the piston cylinder 1, so that a space is reserved for the oil well fluid to enter the cavity of the piston cylinder 1, and the electric driving device driving the piston rod 21 moves intermittently, i.e. moves upwards rapidly when the sucker rod lifts, moves downwards rapidly, and pushes the fluid in the cavity of the piston cylinder 1 to the centrifuge 4. The cavity of the piston cylinder body 1 where the piston 2 is located is a circular cavity, and the volume of the circular cavity is related to the type of the pumping unit 8 and is usually 1.2-1.5 times the rated flow of the pumping unit 8.
Preferably, the centrifuge 4 is a cryo-refrigerated centrifuge. The bottom of the piston cylinder body 1 is communicated with the top of the centrifugal machine 4 through a liquid delivery pipe 11.
According to the oil field salt-containing crystal produced liquid stable gathering and conveying system, the pumping unit drives the pumping rod to ascend to lift an oil-water mixture at the bottom of an oil well to the ground, after water-containing crude oil at the wellhead of the oil well is produced, the one-way valve arranged on the connecting pipe line connected with the outer output port of the produced liquid of the christmas tree is opened, the produced liquid enters the piston cylinder body through the connecting pipe, the piston in the piston cylinder body moves upwards under the driving of the piston connecting rod, a space is reserved for the solid-liquid mixture produced by the oil well to smoothly enter the piston cylinder body, when the pumping unit drives the oil well to descend (not lifting the oil-water mixture of the oil well), the piston pushes the produced liquid of the oil well downwards under the driving of the piston connecting rod to enter the centrifugal machine with a freezing function, and the one-way valve is closed in the pushing process of the piston to the centrifugal machine, and the oil-water mixture in the piston cylinder body is prevented from entering the oil well again through the connecting pipe. The centrifuge with the freezing function can be utilized to cool down the oil-water mixture and enable salt crystals in the produced liquid to be formed rapidly, and the salt crystals are separated from the oil-water mixture under the action of the centrifuge, so that the influence of the salt crystals on the collection and transportation stability of the produced liquid is eliminated, and the centrifuge with the freezing function can enable the produced liquid to be lowered from about 60-65 ℃ to 35-40 ℃. The stable collection of oil field produced liquid is defeated device of this embodiment through setting up piston cylinder body, piston, check valve, centrifuge and communicating pipe, usable centrifuge separates salt crystal in the oil water mixture with the oil water mixture, eliminates salt crystal and gathers the system trouble because of the produced liquid that blocks up the pipeline and arouses, realizes the stable continuous collection of oil field produced liquid and carries. After the produced liquid is subjected to solid-liquid separation by a belt centrifuge, the separated liquid enters a pipeline which is conveyed to a joint station for subsequent oil-water separation, water treatment and slag treatment after a salt crystallization inhibitor with a certain concentration is added.
As shown in fig. 2, this embodiment further provides a method for stabilizing and gathering and transporting oilfield produced liquid, which is implemented by adopting the above system for stabilizing and gathering and transporting oilfield salt-containing crystalline produced liquid, and includes the following steps:
S1, in the lifting process of the produced liquid from an oil well through an oil pumping machine 8, a one-way valve 3 is opened, the produced liquid enters a piston cylinder body 1 through a communicating pipe 5 with the one-way valve 3, and when the produced liquid enters the piston cylinder body 1, a piston 2 moves upwards under the drive of a piston connecting rod 21, and the produced liquid smoothly enters a space below the piston 2;
S2, cooling produced liquid by a centrifugal machine 4, performing solid-liquid separation, adding salt crystallization inhibitor with a certain concentration into separated liquid, then entering a water-containing crude oil tank of a joint station, mixing the separated liquid with a demulsifier in the water-containing crude oil tank, performing oil-water separation, entering separated crude oil (the water content is lower than 0.5%) into a crude oil storage tank, flocculating and filtering the separated produced water, and then entering water evaporation equipment for evaporation and concentration, wherein the concentration of the salt crystallization inhibitor is 50-300 mg/L. The flocculant for flocculation of the produced water is PAC and PAM, the addition amount of the PAC is 200-400 mg/L, the addition amount of the PAM is 5-15 mg/L, the cationic degree of the PAM is 5-25%, and the molecular weight range of the PAM is 800-1600 ten thousand. The filter for filtering the produced water comprises a three-stage filter consisting of 0.3-0.5 mm granular quartz sand, modified fiber balls and an ultrafiltration filter.
S3, mixing the waste salt generated after evaporation of the produced water with solid salt slag separated by the centrifugal machine 4, entering waste salt calcining equipment, and calcining at 650-780 ℃ to form sodium carbonate coarse salt which can be used as a material for tertiary oil recovery liquid preparation or a solid fire extinguishing agent raw material, wherein water phase generated by evaporation of the produced water is treated and recycled, and specifically, the sodium carbonate coarse salt is used as the material for tertiary oil recovery liquid preparation and the solid fire extinguishing agent raw material.
In this embodiment, the demulsifier is added at a joint station, and the main function of the joint station is oil, water, gas and solid separation, so each joint station has a place and equipment for adding the demulsifier specially, and the process is the same as the current demulsifier adding process of the oil field joint station. The water-containing crude oil enters a joint station and is subjected to oil-water separation in a settling tank under the action of an added demulsifier, and then the dehydrated crude oil is conveyed to a finished crude oil storage tank by a pump, and the separated oil-containing wastewater enters an oil-containing wastewater treatment system.
Wherein, the mineralization degree of the water phase of the evaporated water is reduced to below 1000mg/L, the content of suspended matters is respectively reduced to 5.0mg/L, and the oil content is reduced to below 8.0mg/L, and the water phase is used for reinjection of a reservoir or condensed water in the evaporation process of waste strong brine. The obtained slag salt forms a liquid preparation material for tertiary oil recovery when the addition amount of the slag salt is 1% -5% and the addition amount of the petroleum sodium sulfonate is 0.3% -0.7%, and forms a solid fire extinguishing material for extinguishing fire when the addition amount of the slag salt is 25% -35%, the addition amount of the potassium bicarbonate is 30% -35% and the addition amount of the potassium phosphate is the balance.
In one embodiment, taking an oilfield block as an example, an oil well produced liquid is pushed to a centrifuge with a cooling function through a piston driven by power in a piston cylinder (the cooling temperature is 60-65 ℃ and can be reduced to 35-40 ℃ in the centrifuge), after 2000-2500 rpm of the produced liquid is processed for 5-10 minutes, slag enters a temporary storage area, an oil-water mixture is pumped to a joint station after adding a salt crystallization inhibitor synthesized by using polyvinylamine-halogenated polyol and with the addition amount of 50-300 mg/L, and after adding a demulsifier with the alkyl phenolic resin as an initiator and the ethylene oxide-propylene oxide block copolymerization molecular weight of 5000-7000 daltons, the water content of crude oil is reduced to below 0.5% and enters a finished product crude oil tank. Adding PAC and PAM (the added amount is the same as the above) into the separated water phase, filtering, then, entering a three-stage evaporation device, cooling the evaporated concentrated solution, mixing the obtained solid phase component with slag generated by solid-liquid separation, calcining the mixture with 650-780 ℃ for 40-90 min to form slag salt, reducing the mineralization of the water phase of the evaporated water to below 1000mg/L, respectively reducing the suspended matter content and the oil content to below 5.0mg/L and 8.0mg/L, and then, using the water phase to reinjection the water layer or condensate water used in the evaporation process of the waste strong brine, wherein the obtained slag salt forms a material for three oil recovery liquid preparation when the added amount of the slag salt is 1-5%, the added amount of the petroleum sodium sulfonate is 0.3-0.7%, and the slag salt forms a solid fire extinguishing material for fire extinguishment when the added amount of the slag salt is 25-35%, the added amount of the potassium bicarbonate is 30-35%, and the added amount of the potassium phosphate is the rest.
The stable gathering and transportation method for the oil field salt-containing crystal produced liquid can realize stable continuous gathering and transportation of the oil field produced liquid, and can carry out subsequent treatment on the produced liquid so as to realize oil-water separation and recycling of slag salt and water phase.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "transverse", "upper", "lower", "inner", "outer", etc., are based on the directions or positional relationships shown in the drawings, are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the present invention, unless explicitly specified and limited otherwise, the terms "connected," "connected," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, directly connected, indirectly connected via an intermediate medium, or in communication with each other or in an interaction relationship between two elements, unless explicitly specified otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (9)
1. The stable collection and transportation method for the salt-containing crystalline body produced liquid of the oil field is characterized by being realized by adopting a stable collection and transportation system for the salt-containing crystalline body produced liquid of the oil field, wherein the stable collection and transportation system for the salt-containing crystalline body produced liquid of the oil field comprises a piston cylinder body, a piston, a one-way valve, a centrifugal machine, a communicating pipe and a joint station, and the side wall of the piston cylinder body is communicated with a produced liquid output port of a christmas tree of the oil field through the communicating pipe with the one-way valve; the bottom of the piston cylinder body is provided with a liquid outlet which is communicated with an inlet of the centrifugal machine with a freezing function through a liquid pipeline, the piston is arranged in a cavity of the piston cylinder body and is connected with a piston connecting rod, the piston connecting rod extends out of the upper end of the piston cylinder body and can drive the piston to move up and down to open or block the liquid outlet so as to push fluid in the piston cylinder body to flow to the centrifugal machine, the outlet of the centrifugal machine is connected and communicated with a pipeline which is conveyed to a combined station through a pipeline, the combined station is connected with a water-containing crude oil storage tank through a pipeline, the water-containing crude oil storage tank is respectively connected and communicated with a finished crude oil tank and a water tank, a sewage tank is connected with a sewage treatment system through a pipeline, and a water outlet of the sewage treatment system is connected and communicated with water evaporation equipment;
the stable gathering and transportation method for the produced liquid of the salt-containing crystals in the oil field comprises the following steps:
s1, in the upward lifting process of the produced liquid from an oil well through the oil pumping unit, the one-way valve is opened, the produced liquid enters the piston cylinder body through the communicating pipe with the one-way valve, and when the produced liquid enters the piston cylinder body, the piston moves upwards under the drive of the piston connecting rod, and the produced liquid smoothly enters a space below the piston;
S2, cooling produced liquid by a centrifugal machine, performing solid-liquid separation, adding salt crystallization inhibitor into the separated liquid, then entering a water-containing crude oil tank of a joint station, mixing the water-containing crude oil tank with a demulsifier, performing oil-water separation, entering separated crude oil into a finished crude oil storage tank, flocculating and filtering the separated produced water, and then entering water evaporation equipment for evaporation and concentration;
S3, mixing the waste salt generated after evaporation of the produced water with solid salt slag separated by a centrifugal machine, and then feeding the mixture into waste salt calcining equipment to be calcined to form coarse sodium carbonate salt which is used as a material for tertiary oil recovery liquid preparation or a solid fire extinguishing agent raw material, wherein a water phase generated by evaporation of the produced water is recycled after being treated.
2. The method for stabilizing and gathering and transporting salt-containing crystal produced liquid in oil field as claimed in claim 1, wherein said centrifuge is located right under said piston cylinder.
3. The method for stably gathering and transporting the salt-containing crystal produced liquid in the oil field according to claim 1, wherein the piston cylinder body and the oil well christmas tree are arranged side by side, and the volume of the inner cavity of the piston cylinder body is 1.2-1.5 times the rated flow of the pumping unit.
4. The method for stabilizing and gathering and transporting the salt-containing crystalline fluid produced by an oil field according to claim 1, wherein the one-way valve is an interlocking one-way valve.
5. The method for stably collecting and conveying the produced liquid of the salt-containing crystals in the oil field, which is disclosed in claim 1, is characterized in that the communicating pipe is arranged at a position, close to the upper end, of the piston cylinder body, the communicating pipe is transversely or obliquely arranged, and when the communicating pipe is obliquely arranged, one end, connected with the piston cylinder body, of the communicating pipe is lower than one end, connected with the christmas tree of the oil well, of the communicating pipe.
6. The stable gathering and transportation method for the salt-containing crystal produced liquid in the oil field is characterized in that the outer diameter of the piston is smaller than the inner diameter of the piston cylinder body, an upper sealing gasket is arranged on the end face of the upper end of the piston, a lower sealing gasket is arranged on the end face of the lower end of the piston, and the piston connecting rod is movably connected with the upper end of the piston cylinder body in a sealing mode.
7. The method for stabilizing and gathering and transporting the produced liquid of the salt-containing crystals in the oil field according to claim 1, wherein the concentration of the salt crystallization inhibitor is 50-300 mg/L.
8. The stable gathering and transportation method for the salt-containing crystalline produced liquid of the oil field according to claim 1, wherein in S2, flocculating agents for flocculation of produced water are PAC and PAM, the adding amount of PAC is 200-400 mg/L, the adding amount of PAM is 5-15 mg/L, the cationicity of PAM is 5% -25%, and the molecular weight range of PAM is 800-1600 ten thousand.
9. The stable gathering and transportation method for salt-containing crystal produced liquid in oil field as claimed in claim 1, wherein in S2, the filter for filtering produced water comprises a three-stage filter consisting of 0.3-0.5 mm granular quartz sand, modified fiber balls and an ultrafiltration filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202510702943.7A CN120211695B (en) | 2025-05-29 | 2025-05-29 | A stable gathering and transportation system and method for oilfield salt crystal produced fluid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202510702943.7A CN120211695B (en) | 2025-05-29 | 2025-05-29 | A stable gathering and transportation system and method for oilfield salt crystal produced fluid |
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| CN1226628A (en) * | 1998-02-20 | 1999-08-25 | 陈忠 | Technology for frozen separating liquid by chemical displacement |
| CN223104551U (en) * | 2025-05-29 | 2025-07-15 | 克拉玛依市三达新技术股份有限公司 | A stable gathering and transportation device and system for oilfield produced liquid |
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| CA2567171C (en) * | 2006-09-22 | 2014-01-21 | Ge Ionics, Inc. | Treatment of brines for deep well injection |
| US7857396B2 (en) * | 2008-06-17 | 2010-12-28 | Pinnacle Potash International, Ltd. | Method and system for solution mining |
| US20140158616A1 (en) * | 2012-12-07 | 2014-06-12 | Advanced Water Recovery, Llc | Systems, apparatus, and methods for separating salts from water |
| CA2860275C (en) * | 2014-06-02 | 2016-10-25 | Veolia Water Solutions & Technologies North America, Inc. | Oil recovery process including a high solids crystallizer for treating evaporator blowdown |
| RU2553734C1 (en) * | 2014-10-07 | 2015-06-20 | Открытое акционерное общество "Татнефть" им. В.Д. Шашина | Oil treatment method |
| CN105502728B (en) * | 2015-11-25 | 2018-05-11 | 克拉玛依市三达新技术股份有限公司 | A kind of processing method for the high temperature highly salt containing organic waste water that oilfield sewage softening produces |
| CN114225448A (en) * | 2021-12-20 | 2022-03-25 | 西安石油大学 | Tower top system dew point corrosion prevention and control method |
| CN119751216A (en) * | 2024-11-29 | 2025-04-04 | 中国天辰工程有限公司 | A post-treatment process and device for producing polyols |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1226628A (en) * | 1998-02-20 | 1999-08-25 | 陈忠 | Technology for frozen separating liquid by chemical displacement |
| CN223104551U (en) * | 2025-05-29 | 2025-07-15 | 克拉玛依市三达新技术股份有限公司 | A stable gathering and transportation device and system for oilfield produced liquid |
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