Oil-water separation vibration cracking demulsification field side line test system

Abstract

The utility model relates to an oil-water separation vibration cracking demulsification field side line test system which comprises a water phase circulating pump, an oil-water separation reactor, a three-phase separator, an oil-water buffer and an oil-water output pump, a liquid inlet pipe of the oil-water separation reactor is connected with the water phase circulating pump and a feed pipe of a demulsifier, a liquid outlet pipe of the oil-water separation reactor is connected with the three-phase separator, and the three-phase separator is connected with the oil-water buffer. And a liquid outlet pipe of the three-phase separator is respectively connected with the oil-water buffer and the water-phase circulating pump. According to the scheme, fluid pressure difference and flow velocity difference are formed in the water-phase circulating pump, the oil-water separation reactor and the three-phase separator by utilizing to-be-treated oil-water mixture fluid, and an energy field and an electrostatic field which continuously oscillate are generated in the fluid, so that various force balance, charge balance and phase state balance of oil-water combination are destroyed; the effects of demulsification, middle layer elimination and oil-water separation are achieved. After an oil-water separation side line experiment, an oil-water mixture which is detected to reach the standard is discharged, so that the environment-friendly benefit is benefited.

Description

Technical Field

[0001] The utility model relates to the technical field of oilfield development, in particular to an on-site side-line test system for oil-water separation by vibration cracking and demulsification. Background Technique

[0002] In oilfield development, by mixing three components of water, polymer and surfactant, the oil recovery rate of crude oil is enhanced and the fluidity of the produced liquid in the underground reservoir is improved. This technology is called ternary produced liquid. Through experiments, it is found that there are problems in the current chemical treatment method of ternary produced liquid, such as poor demulsification effect, the influence of the oil-water intermediate transition layer on the stable operation of the electro-dehydrator, the excessive oil content in the discharged oil-water mixture, difficult sewage treatment, unqualified injection water quality, difficult injection, and at the same time, large-dose dosing, high cost and poor environmental protection benefits, which seriously affect oilfield development.

[0003] The main reason for the difficulty in oil-water separation lies in the intermediate layer. There are a large number of dark brown substances in the intermediate layer. Through inductively coupled plasma optical emission spectrometry (ICP) detection and combined with X-ray diffraction, it can be determined that FeS and elemental sulfur exist. FeS particles and elemental sulfur deposit on the oil-water interface to form a rigid interfacial film with a dense arrangement, preventing the rheological coalescence of the continuous phase and the dispersed phase, stabilizing the oil-water transition layer and continuously thickening it.

[0004] The main phase states in the intermediate layer include discontinuous oil phase, discontinuous water phase, emulsion droplets, and solid particles floating on the oil-water interface. The emulsification behavior and the intermediate layer phenomenon are essentially the phenomena of force and charge balance. Solving only the emulsification behavior in oil-water separation cannot achieve the standard of oil content in water. It is necessary to jointly solve other oil-water combination forms to completely solve the technical bottleneck of oil-water separation.

[0005] Therefore, how to measure the intermediate layer during oil-water separation is related to whether the result of oil-water separation meets the standard. Only the qualified oil-water mixture is beneficial to environmental protection benefits. However, the existing measurement experimental system cannot complete good separation work on the intermediate layer of oil-water separation. Content of the Utility Model

[0006] The purpose of the utility model is to provide an on-site side-line test system for oil-water separation by vibration cracking and demulsification to solve the problems encountered in the above background technique.

[0007] To achieve the above purpose, the technical solution of the utility model is as follows:

[0008] An on-site side-line test system for oil-water separation by vibration cracking and demulsification includes an aqueous phase circulation pump, an oil-water separation reactor, a three-phase separator, an oil-water buffer, and an oil-water external transfer pump. The inlet pipe of the oil-water separation reactor is connected to the aqueous phase circulation pump and the feed pipe of the demulsifier. The outlet gas pipe of the oil-water separation reactor is connected to a second waste gas discharge pipe. The outlet liquid pipe of the oil-water separation reactor is connected to the three-phase separator. The outlet liquid pipe of the three-phase separator is respectively connected to the oil-water buffer and the aqueous phase circulation pump. The outlet liquid pipe of the oil-water buffer is connected to an outlet pipeline through the oil-water external transfer pump. The inlet pipe of the aqueous phase circulation pump is also connected to a pipeline for the oil-water mixture.

[0009] In the above solution, it further includes a first gas phase balance pipeline and a second gas phase balance pipeline. One end of the first gas phase balance pipeline is connected to the oil-water separation reactor, and the other end is connected to the three-phase separator. One end of the second gas phase balance pipeline is connected to the three-phase separator, and the other end is connected to the oil-water buffer.

[0010] As a preferred solution, the second gas phase balance pipeline is connected to a first waste gas discharge pipe through a first safety valve. Additionally, the second waste gas discharge pipe can also be connected to the first waste gas discharge pipe through a second safety valve.

[0011] To facilitate sampling and verifying the oil-water separation situation, sampling nozzles are respectively installed on the pipeline for the oil-water mixture, the output pipeline of the oil-water separation reactor, and the outlet liquid pipe of the three-phase separator.

[0012] In the above solution, the connection of the aqueous phase circulation pump, the oil-water separation reactor, and the three-phase separator forms a circulation pipeline. The feed pipe of the demulsifier and the pipeline for the oil-water mixture are oil-carrying pipelines.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows: By utilizing the fluid pressure difference and flow velocity difference formed by the oil-water mixture fluid to be treated in the aqueous phase circulation pump, the oil-water separation reactor, and the three-phase separator, a continuous oscillating energy field and electrostatic field are generated inside the fluid, destroying the various force balances, charge balances, and phase state balances of the oil-water combination, achieving the effects of demulsification and eliminating the intermediate layer to realize oil-water separation. After the oil-water separation side-line experiment, by discharging the qualified oil-water mixture detected, it is beneficial to the environmental protection benefit. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The disclosure of the present utility model will be described with reference to the accompanying drawings. It should be understood that the drawings are only for illustrative purposes and are not intended to limit the protection scope of the present utility model. In the drawings, the same reference numerals are used to refer to the same components. Among them:

[0015] Figure 1 is a schematic diagram of the working principle of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] In order to make the technical means, creative features, achieved purposes and effects realized by the present utility model easy to understand, the present utility model will now be further described in detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present utility model in a schematic manner, so they only show the relevant components of the present utility model.

[0017] According to the technical solution of the present utility model, without changing the essence of the present utility model, those of ordinary skill in the art can propose various interchangeable structural forms and implementation methods. Therefore, the following specific embodiments and drawings are only exemplary descriptions of the technical solution of the present utility model, and should not be regarded as the whole of the present utility model or as a limitation or restriction on the technical solution of the present utility model.

[0018] The technical solution of the present utility model will be further described in detail below with reference to the drawings and embodiments.

[0019] As Figure 1 shown, an on-site side-line test system for oil-water separation by vibration cracking and demulsification includes an aqueous phase circulation pump, an oil-water separation reactor, a three-phase separator, an oil-water buffer, and an oil-water external transfer pump. The inlet pipes of the oil-water separation reactor are respectively connected to the aqueous phase circulation pump and the feed pipe of the demulsifier. The demulsifier is supplied from a demulsifier tank, and the recycled aqueous liquid continues to participate in the oil-water demulsification reaction. The outlet gas pipe of the oil-water separation reactor is connected to a second waste gas discharge pipe, and when the waste gas obtained from the reaction is discharged in time through the second waste gas discharge pipe.

[0020] The outlet liquid pipe of the oil-water separation reactor is connected to the three-phase separator to continue treating the oil liquid from which the waste gas has been removed. After the three-phase separation of oil and water, the outlet liquid pipes of the three-phase separator are respectively connected to the oil-water buffer and the aqueous phase circulation pump. The outlet liquid pipe of the oil-water buffer is connected to an outlet pipeline through an oil-water external transfer pump to discharge the purified oil-water mixture. Generally, the oil-water mixture is returned and discharged to the oil-water main pipeline. The inlet liquid pipe of the aqueous phase circulation pump is also connected to a pipeline for the oil-water mixture to receive the unpurified and separated oil-water mixture.

[0021] In this solution, the connection of the three devices, namely the aqueous phase circulation pump, the oil-water separation reactor, and the three-phase separator, constitutes a circulation pipeline to conduct an oil-water separation experiment on the input oil-water mixture. The feed pipe of the demulsifier and the pipeline of the oil-water mixture are oil-carrying pipelines, and the oil-water mixture cooperates with the demulsifier to perform an oil-water separation operation in the oil-water separation reactor.

[0022] The solution of the present utility model utilizes the fluid pressure difference and flow velocity difference formed by the oil-water mixture fluid to be treated in the aqueous phase circulation pump, the oil-water separation reactor, and the three-phase separator to generate a continuously oscillating energy field and electrostatic field inside the fluid, destroying the various force balances, charge balances, and phase equilibriums of the oil-water combination, achieving the effects of demulsification and eliminating the intermediate layer to realize oil-water separation.

[0023] During implementation, it also includes a first gas phase balance pipeline and a second gas phase balance pipeline. One end of the first gas phase balance pipeline is connected to the oil-water separation reactor, and the other end is connected to the three-phase separator, using an interconnected method to balance the air pressure between the oil-water separation reactor and the three-phase separator, avoiding excessive fluid pressure difference. Additionally, a gas valve is installed in the middle of the first gas phase balance pipeline for pressure relief. One end of the second gas phase balance pipeline is connected to the three-phase separator, and the other end is connected to the oil-water buffer, using an interconnected method to balance the air pressure between the three-phase separator and the oil-water buffer, avoiding excessive fluid pressure difference. Additionally, a gas valve is installed in the middle of the second gas phase balance pipeline for pressure relief.

[0024] As a preferred solution, the second gas phase balance pipeline is connected to a first waste gas discharge pipe through a first safety valve. When a certain fluid pressure difference is reached, the waste gas is discharged by opening the first safety valve. Additionally, the second waste gas discharge pipe can also be connected to the first waste gas discharge pipe through a second safety valve to merge the two waste gas discharge pipelines. Having two waste gas discharge pipelines can discharge the waste gas in the oil-water separation reactor and the waste gas generated during the gas phase balance process.

[0025] To facilitate sampling and verifying the oil-water separation situation, sampling nozzles are respectively installed on the pipeline of the oil-water mixture, the output pipeline of the oil-water separation reactor, and the liquid outlet pipe of the three-phase separator. The sampling nozzles are divided into four sampling nozzles A, B, C, and D. Sampling nozzle A confirms the sample of the oil-water mixture, sampling nozzle B confirms the oil-water fluid passing through the oil-water separation reactor, and sampling nozzles C and D verify the oil-water fluid obtained by the three-phase separator. Since two pipelines are provided, two samplings can be carried out. If the two results are consistent or not much different, it proves that the results obtained from the sampling experiment are accurate.

[0026] The oil-water mixture is combined with a demulsifier and continuously fed into and discharged from the oil-water separation reactor through a feed pump. By changing various reaction conditions, samples are taken from sampling nozzle A, sampling nozzle B, and sampling nozzles C and D respectively, observing the oil-water separation speed after the test device processes, analyzing the oil content in the aqueous phase and the water content in the oil phase, and studying the processing capacity and processing effect of the experimental device under various factors.

[0027] Before being processed by the experimental device, the oil-water mixture from the oil-water main pipe had a high ratio of recycled aged oil, contained a large number of dark brown bubbles, had a relatively thick middle layer, the separated water was turbid, the oil interface was irregular, and a large amount of unknown substances adhered to the inner wall of the container. After being processed by this on-site side-line test system for oil-water separation by vibration cracking and demulsification, the bubbles in the oil-water basically disappeared, the separated water was basically clarified, there was no attachment on the inner wall of the container, the oil-water interface was clear and neat, the oil surface was smooth and dense, and the middle layer after treatment was reduced by more than 90%. Through the effect of this on-site side-line test: the oil-water separation performance was strong, and the oil content in the water decreased significantly.

[0028] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. These un-disclosed elements all belong to the prior art that can be known to those skilled in the art.

[0029] The specific embodiments described above have further elaborated on the purpose, technical solutions and beneficial effects of the present utility model. It should be understood that the above description is only the specific embodiments of the present utility model and is not used to limit the protection scope of the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An oil-water separation vibration and demulsification on-site sideline test system, characterized by: It includes a water phase circulation pump, an oil-water separation reactor, a three-phase separator, an oil-water buffer, and an oil-water export pump. The liquid inlet pipe of the oil-water separation reactor is connected to the water phase circulation pump and the feed pipe of the demulsifier. The gas outlet pipe of the oil-water separation reactor is connected to the second exhaust gas discharge pipe. The liquid outlet pipe of the oil-water separation reactor is connected to the three-phase separator. The liquid outlet pipe of the three-phase separator is respectively connected to the oil-water buffer and the water phase circulation pump. The liquid outlet pipe of the oil-water buffer is connected to the outlet pipeline through the oil-water export pump; the liquid inlet pipe of the water phase circulation pump is also connected to the pipeline of the oil-water mixture.

2. The oil-water separation vibration and demulsification field sideline test system according to claim 1, characterized in that: It also includes a first gas phase balancing pipeline and a second gas phase balancing pipeline, one end of the first gas phase balancing pipeline is connected to the oil-water separation reactor, and the other end is connected to the three-phase separator; one end of the second gas phase balancing pipeline is connected to the three-phase separator, and the other end is connected to the oil-water buffer.

3. The oil-water separation vibration demulsification on-site sideline test system according to claim 2, characterized in that: The second gas phase balance pipeline is connected to the first exhaust gas discharge pipe through a first safety valve.

4. The oil-water separation vibration demulsification on-site sideline test system according to claim 3 is characterized by: The second exhaust gas exhaust pipe is connected to the first exhaust gas exhaust pipe through a second safety valve.

5. The oil-water separation vibration demulsification on-site sideline test system according to claim 1, characterized in that: The pipeline of the oil-water mixture, the output pipeline of the oil-water separation reactor, and the liquid outlet pipe of the three-phase separator are respectively equipped with sampling pipe openings.

6. The oil-water separation vibration and demulsification field sideline test system according to claim 1, characterized in that: The connection of the water phase circulation pump, the oil-water separation reactor and the three-phase separator constitutes a circulation pipeline; the feed pipe of the demulsifier and the pipeline of the oil-water mixture are oil-carrying transportation pipelines.

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