CN210136160U - Device for detecting deposition temperature and deposition amount of easily precipitated substances in oil gas - Google Patents
Device for detecting deposition temperature and deposition amount of easily precipitated substances in oil gas Download PDFInfo
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- CN210136160U CN210136160U CN201920550802.8U CN201920550802U CN210136160U CN 210136160 U CN210136160 U CN 210136160U CN 201920550802 U CN201920550802 U CN 201920550802U CN 210136160 U CN210136160 U CN 210136160U
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Abstract
The utility model provides a device for detecting deposition temperature and deposition amount of easy deposition substances in oil gas, which comprises an oil gas storage unit, a first pressure detection unit, a second pressure detection unit, a rock core clamping unit, a heating unit, a first temperature detection unit and a flow detection unit; the core clamping unit is used for placing a core and isolating the core from the outside; an outlet of the oil gas storage unit is communicated with one end of the first pressure detection unit, the other end of the first pressure detection unit is communicated with an inlet of the core clamping unit, one end of the second pressure detection unit and the first temperature detection unit are respectively communicated with an outlet of the core clamping unit, and the other end of the second pressure detection unit is communicated with the flow detection unit; and the heating unit is used for heating and insulating the core clamping unit. The device can be used for rapidly detecting the deposition point temperature and the deposition amount of the easily precipitated substances in oil gas on the oil field.
Description
Technical Field
The utility model relates to a detection device especially relates to a detect device of easy precipitate deposition temperature and deposition volume in oil gas, belongs to oil gas yield increase technical field.
Background
Organic solid phase deposition in hydrocarbon systems of oil and gas often occurs in oil and gas reservoir reservoirs, exploitation facilities, pipeline gathering and transportation and processing equipment, and is always a scientific and technical problem in the petroleum industry.
Before the oil and gas are produced, the reservoir fluid and the reservoir porous medium are in a thermodynamic equilibrium state. Once placed into production, the equilibrium is destroyed, triggering the precipitation and deposition of organics from the reservoir from the crude oil and natural gas. The organic solid phase deposition in the shaft can increase the roughness of the pipeline, thereby increasing the pressure gradient of fluid flow, greatly reducing the utilization rate of the pipeline, increasing the work rechecking of the pumping device, reducing the yield of the oil-gas well and increasing the exploitation cost. In addition, the deposition of organic solids can also lead to failure or damage to the process equipment, greatly reducing equipment utilization and the flow capacity of the production tubing.
Therefore, a device capable of rapidly detecting the deposition point temperature and deposition amount of the easy deposition substance in the oil gas in the oil field is needed, and the device has important significance for preventing the precipitation of the easy deposition substance, preventing the blockage of a conveying pipeline and improving the production efficiency in the recovery field by mastering the relevant information of oil gas deposition.
SUMMERY OF THE UTILITY MODEL
The utility model provides a detect device of easy precipitate deposition temperature and deposition volume in oil gas, the device can carry out short-term test to easy precipitate deposition point temperature and deposition volume in oil gas at the oil field scene, to gathering the easy precipitate of on-the-spot prevention appear, prevent that pipeline from blockking up, improve production efficiency and have important meaning.
The utility model provides a device for detecting deposition temperature and deposition amount of easy deposition substances in oil gas, which comprises an oil gas storage unit, a first pressure detection unit, a second pressure detection unit, a rock core clamping unit, a heating unit, a first temperature detection unit and a flow detection unit; the core clamping unit is used for placing a core and isolating the core from the outside;
an outlet of the oil-gas storage unit is communicated with one end of the first pressure detection unit, the other end of the first pressure detection unit is communicated with an inlet of the core clamping unit, one end of the second pressure detection unit and the first temperature detection unit are respectively communicated with an outlet of the core clamping unit, and the other end of the second pressure detection unit is communicated with the flow detection unit;
the heating unit is used for heating and insulating the core clamping unit.
The device for detecting the deposition temperature and the deposition amount of the easy precipitate in the oil gas further comprises a decompression unit;
one end of the pressure reducing unit is communicated with an outlet of the oil-gas storage unit, and the other end of the pressure reducing unit is communicated with the first pressure detection unit.
The device for detecting the deposition temperature and the deposition amount of the easily precipitated matters in the oil gas further comprises a drying unit;
the drying unit is used for drying the fluid output by the oil and gas storage unit.
The device for detecting the deposition temperature and deposition amount of the easily deposited matters in the oil gas further comprises a second temperature detection unit;
and the second temperature detection unit is communicated with an inlet of the core clamping unit.
The device for detecting the deposition temperature and deposition amount of the easily deposited matters in the oil gas, wherein the permeability of the core is k1And k is not less than 0.011＜10mD。
The device for detecting the deposition temperature and deposition amount of the easily deposited matters in the oil gas, wherein the permeability of the core is k1And k is not less than 0.011＜0.5mD。
The device for detecting the deposition temperature and deposition amount of the easily deposited matters in the oil gas, wherein the permeability of the core is k2And k is more than or equal to 102＜100mD。
The device for detecting the deposition temperature and deposition amount of the easily deposited matters in the oil gas, wherein the permeability of the core is k2And k is more than or equal to 102＜50mD。
The device for detecting the deposition temperature and deposition amount of the easily precipitated substances in the oil gas comprises a core clamping unit, a core clamping unit and a detection unit, wherein the core clamping unit comprises a high-pressure steel pipe with a circular cross section and plugs for plugging two ends of the high-pressure steel pipe;
the pressure resistance of the high-pressure steel pipe is greater than 20 MPa.
The device for detecting the deposition temperature and the deposition amount of the easily precipitated substances in the oil gas is characterized in that the drying unit comprises a drying agent.
The utility model discloses a detect device of easy precipitate deposition temperature and deposition volume in oil gas through the temperature of the oil gas that reduces gradually through the rock core and monitor the change of rock core permeability simultaneously, when rock core permeability takes place to obviously reduce, proves the easy precipitate in the oil gas and has appeared in the rock core to can master easy precipitate deposition temperature range in the oil gas according to current temperature;
in addition, the content of easily precipitated substances in the oil gas in the deposition temperature range can be calculated according to the mass change of the rock core, so that the further understanding of the oil gas property is facilitated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
FIG. 1 is a schematic structural diagram of a first embodiment of the device for detecting deposition temperature and deposition amount of easily precipitated substances in oil gas;
FIG. 2 is a schematic structural diagram of a second embodiment of the device for detecting deposition temperature and deposition amount of easily precipitated substances in oil gas;
FIG. 3 is a schematic structural diagram of a third embodiment of the device for detecting deposition temperature and deposition amount of easily precipitated substances in oil gas of the present invention;
FIG. 4 is a schematic structural diagram of a fourth embodiment of the device for detecting deposition temperature and deposition amount of easily precipitated substances in oil gas of the present invention;
fig. 5 is a schematic structural diagram of the fifth embodiment of the device for detecting deposition temperature and deposition amount of easily precipitated substances in oil gas.
Detailed Description
To make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention are combined to clearly and completely describe the technical solutions in the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless specifically stated otherwise.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the present application and in the drawings described above, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In the description of the present invention, it should be noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., to mean a fixed connection, a connection through intervening media, a connection between two elements, or an interaction between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Example one
FIG. 1 is a schematic structural diagram of a first embodiment of the device for detecting deposition temperature and deposition amount of easily precipitated substances in oil gas.
As shown in fig. 1, the device for detecting deposition temperature and deposition amount of easily precipitated substances in oil gas provided by this embodiment includes an oil gas storage unit 1, a first pressure detection unit 2, a second pressure detection unit 3, a core holding unit 4, a heating unit 5, a first temperature detection unit 6, and a flow detection unit 7; the core clamping unit 4 is used for placing a core and isolating the core from the outside;
an outlet of the oil gas storage unit 1 is communicated with one end of a first pressure detection unit 2, the other end of the first pressure detection unit 2 is communicated with an inlet of a core clamping unit 4, one end of a second pressure detection unit 3 and a first temperature detection unit 6 are respectively communicated with an outlet of the core clamping unit 4, and the other end of the second pressure detection unit 3 is communicated with a flow detection unit 7;
the heating unit 5 is used for heating the heat preservation rock core clamping unit 4.
Specifically, the oil gas storage unit 1 is used for storing an oil gas object to be tested. When the deposition temperature and the deposition amount of an easy precipitate in the natural gas are detected, the oil-gas storage unit 1 is used for storing the natural gas to be detected; when the deposition temperature and the deposition amount of the easy deposition substances in the crude oil are detected, the oil-gas storage unit 1 is used for storing the crude oil to be detected.
The utility model discloses do not restrict the concrete expression form of oil gas storage unit 1, as long as can not react with the determinand and can make the determinand not with external contact remain stable can, for example can be common oil storage tank or the gas holder in this field.
The first pressure detecting unit 2 and the second pressure detecting unit 3 are used for detecting whether a fluid passes through and the pressure of the fluid passing through, and may be, for example, pressure gauges commonly known in the art.
The core holding unit 4 is mainly used for accommodating a core. Because the rock core is cylindric generally, consequently can adopt the cross section to be the steel end cap conduct at circular shape steel pipe and the steel that is used for the shutoff steel pipe both ends the utility model discloses a rock core centre gripping unit 4, wherein, the hollow portion of steel pipe is used for the holding rock core. It can be understood that, in order to accommodate the core, the inner diameter of the cross section of the steel pipe is slightly larger than the diameter of the cross section of the core, and the height of the hollow part of the steel pipe is slightly larger than the height of the core. Because the fluid output from the oil and gas storage unit 1 has certain pressure in the detection process, a high-pressure resistant steel pipe can be used as the main body of the core clamping unit 4, wherein the pressure resistance of the high-pressure resistant steel pipe is greater than 20 MPa.
Furthermore, before the plug is used for plugging the steel pipe, the core is placed in the steel pipe, so that in order to avoid the error of a detection result caused by the rock of the core in the steel pipe, the high-temperature and high-pressure resistant glue can be used for filling the pores between the core and the inner wall of the steel pipe, and the core is fixed in the steel pipe. And then, two ends of the steel pipe are respectively plugged by utilizing the two plugs. The end cap can block the two ends of the steel pipe through the clamping or screwing relation.
In the detection process, the steel pipe is horizontally placed with the ground, one end of the steel pipe close to the oil-gas storage unit 1 is the inlet end of the core clamping unit 4, a plug for plugging the end of the steel pipe is an inlet plug, and the core end close to the inlet plug is the inlet end of a core; one end of the steel pipe far away from the oil-gas storage unit 1 is the outlet end of the core clamping unit 4, the plug for plugging the end of the steel pipe is an outlet plug, and the core end close to the outlet plug is the outlet end of the core.
Through set up the through-hole respectively on entry end cap and export end cap, can make crude oil or natural gas from oil gas storage unit 1 get into from the entry end of rock core clamping unit 4 to export from the exit end of rock core clamping unit 4 behind the rock core. For example, the diameter of the through-hole may be 0.15 cm.
In order to ensure that crude oil or natural gas can enter the rock core from each pore of the rock core inlet end and be fully filled with the rock core and be output from each pore of the rock core outlet end, a certain distance can be reserved between one end, close to the rock core inlet, of the inlet plug and the rock core inlet, and a certain distance can be reserved between one end, close to the rock core outlet, of the outlet plug and the rock core outlet. Therefore, after crude oil or natural gas enters the core clamping unit 4, the space between the plug and the core can be filled firstly, and then the crude oil or natural gas enters the core or the output core clamping unit 4.
It is worth noting that the utility model discloses a detection device is detecting time, and the permeability of rock core is according to waiting to detect the difference of fluid property and difference to some extent.
Specifically, when natural gas is used in the oil and gas storage unit 1, that is, the fluid to be detected is natural gas, since the content of easily precipitated substances in the natural gas is low, in order to ensure the validity of the detection result, the permeability k needs to be selected1Lower cores, e.g. and 0.01. ltoreq. k1Less than 10mD, further, k is 0.01. ltoreq. k1< 0.5 mD; when the oil-gas storage unit 1 is crude oil, that is, the fluid to be detected is crude oil, since the crude oil has a high content of easily precipitated substances and is mostly asphaltene with high viscosity, the permeability k needs to be selected to ensure the validity of the detection result2Higher cores, e.g. and 10 ≦ k2< 100mD, further, k is 10. ltoreq. k2＜50mD。
The utility model discloses do not restrict the size of rock core, can be the standard rock core size in this field, for example long 5cm, the diameter is 2.5 cm.
The heating unit 5 is used for heating and insulating the core holding unit 4, and the heating unit and the core holding unit can be directly connected. By continuously reducing the temperature of the heating unit 5, the fluid flowing through the core is continuously cooled, so that deposition of the easily precipitated substances in the fluid can be realized, and the deposition temperature of the easily precipitated substances can be determined. The utility model discloses in, heating element 5 can specifically be thermostatic waterbath device, realizes the control to fluid temperature in the rock core through arranging rock core centre gripping unit 4 in the thermostatic waterbath.
The first temperature detection unit 6 and the flow rate detection unit 7 are respectively used for detecting the temperature and the flow rate (volume or mass) of the fluid output from the core holding unit 4, wherein the temperature of the fluid output from the core holding unit 4 is helpful for more accurately determining the deposition temperature of the easily precipitated substances in the fluid, and the volume of the fluid output from the core holding unit 4 is used for calculating the current permeability of the core.
It is right below that the utility model discloses detection device's use flow introduces.
Before detection, the core holding unit 4 containing the core may be heated to a first temperature in the heating unit 5 and insulated for at least 30min, and then the oil-gas storage unit 1 is started to enable fluid in the oil-gas storage unit 1 to be output and sequentially pass through the first pressure detection unit 2, the core holding unit 4, the second pressure detection unit 3, the first temperature detection unit 6 and the flow detection unit 7 through a pipeline, so that when changes of the first pressure detection unit 2, the second pressure detection unit 3, the first temperature detection unit 6 and the flow detection unit 7 are observed, the core holding unit 4 is ensured to have the fluid to pass through. Wherein the first temperature is the temperature of the fluid in the oil and gas storage unit 1.
After ensuring that the fluid passes through the core holding unit 4, observing the change of the first temperature detection unit 6, when the first temperature detection unit 6 displays that the absolute value of the difference between the temperature (a +/-w) DEG C of the fluid output from the core outlet and the first temperature a DEG C is not higher than a preset value, recording the numerical values of the first pressure detection unit 2, the second pressure detection unit 3, the first temperature detection unit 6 and the flow detection unit 7 at the moment, and closing the oil-gas storage unit 1. Wherein the preset value w may be, for example, 2 ℃.
According to the obtained values of the first pressure detection unit 2, the second pressure detection unit 3, the first temperature detection unit 6 and the flow detection unit 7, the permeability of the current core is calculated according to the following formula, and the permeability at the first temperature can be called as a first permeability.
When natural gas is in the oil and gas storage unit 1:
wherein K is the permeability and the unit is D; q0Is the volume flow of gas at atmospheric pressure, in cm3S; μ is viscosity in mPa · s; l is the length of the core and is in cm; p is a radical of0Atmospheric pressure in atm; p is a radical of1The pressure value of the first pressure detection unit is in atm; p is a radical of2Is the pressure value of the second pressure detection unitIn atm; a is the cross-sectional area of the core in cm2。
When crude oil is in the oil and gas storage unit 1:
wherein K is the permeability and the unit is D; Δ p is the difference between the pressure value of the first pressure detection unit and the pressure value of the second pressure detection unit, and the unit is atm; q is the flow through the core at differential pressure Δ p, in cm3S; μ is viscosity in mPa · s; l is the length of the core and is in cm; a is the cross-sectional area of the core in cm2。
After the first permeability is obtained, the temperature of the heating unit 5 is adjusted to a second temperature, and the above operation method is repeated to obtain a second permeability, wherein the second temperature is lower than the first temperature.
After the second permeability is obtained, the temperature of the heating unit 5 is adjusted to a third temperature, and the above operation method is repeated to obtain the third permeability, wherein the third temperature is lower than the first temperature.
And by analogy, respectively obtaining a fourth permeability, a fifth permeability, a sixth permeability, … …, an (N-1) th permeability and an Nth permeability, wherein the Nth permeability is about 5% different from the (N-1) th permeability. In the above process of obtaining the permeability, the temperature of the previous time is higher than the temperature of the next time by, for example, 3 ℃, for example, the first temperature is a ℃, the second temperature is (a-3) ° c, the third temperature is (a-6) ° c, and so on, and the nth temperature is [ a-3(N-1) ] ° c.
At this time, the deposition temperature of the easily precipitated substances in the fluid is explained to be [ a-3 (N-2). + -. w ]. degree.C.to [ a-3 (N-1). + -. w ]. degree.C..
It can be understood that, in the above process, with the gradual decrease of the temperature, the precipitation possibility of the easy precipitate in the fluid is increased, and when the temperature of the core is higher than the precipitation temperature of the easy precipitate in the fluid, the fluid can smoothly pass through the core without being precipitated in the core, and at this time, the permeability of the core is not changed; as the temperature decreases, once the core temperature is below the deposit temperature of the easily deposited deposits in the fluid, the easily deposited deposits in the fluid may deposit in the core, and thus the permeability of the core may significantly decrease.
Therefore, the utility model discloses an above-mentioned device can detect the deposition temperature of easy precipitate in the oil gas, in the testing process, for accurate testing result, make rock core clamping unit 4 and heating unit 5 keep same temperature earlier, when the temperature that the temperature detecting element detected afterwards, when the absolute value of the difference between the temperature of rock core output fluid and heating unit 5's temperature is not higher than the default promptly, through the pressure variation, the flow change of recording current rock core access & exit and the temperature of rock core output fluid, calculate the permeability of current rock core; and then, reducing the temperature of the heating unit 5, repeating the steps for multiple times to calculate the permeability of the core, and along with the reduction of the temperature, when the permeability of the core is obviously reduced, indicating that substances are precipitated in the current core, wherein the interval between the temperature corresponding to the temperature detection unit (namely the fluid temperature at the outlet of the core) and the temperature corresponding to the temperature detection unit with the previous permeability is the deposition temperature range of the easily precipitated substances.
Furthermore, the utility model discloses a device can also detect the deposition volume of easy educt in the oil gas, and then acquires more rerum natura data of oil gas through the deposition volume. The detection of the deposition amount and the detection of the deposition temperature may be performed simultaneously. Specifically, at the beginning of the test, the mass of the weighed core is m0When the core is deposited, weighing the core to obtain a mass m1At this time (m)1-m0) The ratio of the mass of the easily precipitated substance per unit volume of the fluid in the deposition temperature range to the volume of the flow rate detecting unit 7. It will be appreciated that it is also possible to continue to lower the temperature, thereby obtaining a mass of precipitates prone to precipitation per volume of fluid in different temperature ranges.
The device design of this embodiment is ingenious, simple structure, and low in manufacturing cost can be used for deposit temperature and the deposit volume of the easy precipitate of natural gas of survey at the oil gas field scene, and through the in-service use, and its experiment precision also can satisfy the on-the-spot design demand of gas field completely, has practiced thrift a large amount of manpowers, financial resources and material resources for the gas field development, has also made certain contribution for the further research of oil gas rerum natura test.
Example 2
Fig. 2 is a schematic structural diagram of a second embodiment of the device for detecting deposition temperature and deposition amount of easily precipitated substances in oil gas.
As shown in fig. 2, on the basis of the previous embodiment, the apparatus for detecting deposition temperature and deposition amount of easily precipitated substances in oil gas provided by the present embodiment further comprises a decompression unit 8;
one end of the decompression unit 8 is communicated with the outlet of the oil-gas storage unit 1, and the other end of the decompression unit 8 is communicated with the first pressure detection unit 2.
Specifically, with decompression unit 8 setting between oil gas storage unit 1 export and first pressure detecting element 2, this decompression unit 8 can be adjusted from the pressure of the fluid of output in oil gas storage unit 1 to more accurate assurance fluid can flow in the device with steady effectual pressure, and when the fluid passes through first pressure detecting element 2, can also go on further confirming through first pressure detecting element 2 to the pressure of the fluid that will get into core clamping element 4, if the pressure deviation appears, can further adjust through decompression unit 8.
Generally, when the device of the utility model is used, the pressure of the fluid entering the rock core clamping unit 4 is set to be about 10MPa, so that when the fluid is output from the oil-gas storage unit 1, the pressure of the fluid can be controlled by the pressure reducing unit 8; when the fluid passes through the first pressure detection unit 2, the pressure of the fluid about to enter the core holding unit 4 can be detected again, and if the detection result is deviated from the target pressure, the pressure can be adjusted again through the pressure reduction unit 8.
In addition, in the detection process, the stabilization of the fluid can be realized through the pressure reduction unit 8, and the deviation of the detection result caused by the instability of the fluid is avoided.
The present invention does not limit the specific expression of the decompression unit 8, and may be a decompression valve, for example.
The device design benefit of this embodiment, moreover, the steam generator is simple in structure, low in manufacturing cost, and can realize the steady flow of fluid in the device through the decompression unit, thereby help further improving the precision of testing result, consequently, can be used for survey the deposition temperature and the deposition volume of the easy precipitate of natural gas at the oil gas field scene, and through the in-service use, its experimental precision also can satisfy the on-the-spot design demand of gas field completely, practiced thrift a large amount of manpowers, financial resources and material resources for the gas field development, also made certain contribution for the further research of oil gas rerum natura test.
EXAMPLE III
On the basis of the previous embodiment, the device for detecting the deposition temperature and deposition amount of the easily precipitated matters in the oil gas provided by the embodiment further comprises a drying unit 9;
the drying unit 9 is used to dry the fluid output through the oil and gas storage unit 1.
Specifically, the drying unit 9 is used for drying the fluid which is output from the oil and gas storage unit 1 and is about to enter the core holding unit 4, and detection result deviation caused by influence of moisture carried in the fluid on the permeability of the core is avoided.
The utility model discloses do not restrict the concrete expression form of drying unit 9, as long as can dry the fluid can. In one embodiment, the drying agent may be impregnated in a tubular body, and holes may be provided at both ends of the tubular body as an inlet and an outlet for the fluid to the drying unit 9, respectively. The desiccant may be silica, anhydrous calcium sulfate, or the like, and in order to ensure the matching degree of the drying unit 9 with the pressure fluid, a tubular body with certain pressure resistance may be selected to contain the desiccant, for example, a steel pipe with a pressure resistance greater than 20 MPa.
The specific connection manner of the drying unit 9 may include the following two manners.
Fig. 3 is a schematic structural diagram of a third embodiment of the device for detecting deposition temperature and deposition amount of easily precipitated substances in oil gas.
As shown in fig. 3, in the apparatus for detecting deposition temperature and deposition amount of easily precipitated substances in oil gas provided in the present embodiment, one end of the drying unit 9 is communicated with one end of the depressurizing unit 8, and the other end of the drying unit 9 is communicated with the first pressure detecting unit 2.
In specific application, after the fluid is output from the outlet of the oil-gas storage unit 1, the pressure of the fluid is adjusted by the pressure reduction unit 8, then the fluid enters the drying unit 9 through the inlet of the drying unit 9, and along with the gradual contact between the fluid and the drying agent in the drying unit 9, the moisture in the fluid is absorbed by the drying agent, so that the water content in the fluid is reduced. After that, the dried fluid is output from the outlet of the drying unit 9, subjected to pressure detection by the first pressure detection unit 2, and then enters the core holding unit 4.
The fluid treated by the drying unit 9 has a significantly reduced water content, so that the influence of water on the permeability of the core is avoided, and the accuracy of the detection result is further improved.
Example 4
Fig. 4 is a schematic structural diagram of the fourth embodiment of the device for detecting deposition temperature and deposition amount of easily precipitated substances in oil gas.
As shown in fig. 4, in the apparatus for detecting deposition temperature and deposition amount of easily precipitated substances in oil gas provided by this embodiment, one end of the drying unit 9 is communicated with the first pressure detecting unit 2, and the other end of the drying unit 9 is communicated with the inlet of the core holding unit 4.
When the device is used specifically, after the fluid is output from the outlet of the oil-gas storage unit 1, the pressure of the fluid is firstly adjusted by the pressure reduction unit 8, then the fluid is subjected to pressure detection by the first pressure detection unit 2 and then enters the drying unit 9 through the inlet of the drying unit 9, and along with the gradual contact between the fluid and the drying agent in the drying unit 9, the moisture in the fluid can be absorbed by the drying agent, so that the water content in the fluid is reduced. Then, the dried fluid enters the core holding unit 4 through the inlet of the core holding unit 4.
The fluid treated by the drying unit 9 has a significantly reduced water content, so that the influence of water on the permeability of the core is avoided, and the accuracy of the detection result is further improved.
The device design benefit of embodiment three and four, moreover, the steam generator is simple in structure, low in manufacturing cost, and through the drying of moisture in the drying unit convection current, the influence of moisture wherein to rock core permeability has been avoided, thereby help further improving the precision of testing result, consequently, can be used for deposit temperature and the deposit volume of the easy precipitate of natural gas of survey on-the-spot in oil gas field, and through in-service use, its experimental precision also can satisfy the on-the-spot design demand in gas field completely, practiced thrift a large amount of manpowers, financial resources and material resources for gas field development, also made certain contribution for the further research of oil gas rerum natura test.
Example 5
Fig. 5 is a schematic structural diagram of the fifth embodiment of the device for detecting deposition temperature and deposition amount of easily precipitated substances in oil gas.
As shown in fig. 5, on the basis of the third embodiment, the apparatus for detecting deposition temperature and deposition amount of easily precipitated substances in oil gas provided by the present embodiment further comprises a second temperature detecting unit 10;
the second temperature detection unit 10 is communicated with an inlet of the core holding unit 4.
The second temperature detection unit 10 is configured to detect a temperature of the fluid entering the core holding unit 4.
In the foregoing embodiment, the deposition temperature of the easily deposited substances is [ a-3 (N-2). + -. w ]. degree.C to [ a-3 (N-1). + -. w ]. degree.C, where [ a-3 (N-2). + -. w ]. degree.C. is the temperature of the first temperature detecting unit 6 corresponding to the (N-1) -th permeability, and [ a-3 (N-1). + -. w ]. degree.C. is the temperature of the first temperature detecting unit 6 corresponding to the N-th permeability.
It is understood that when the temperature of the fluid is [ a-3 (N-2). + -. w ]. degree.C., no deposition of the fluid occurs in the core, and even between temperatures greater than [ a-3 (N-2). + -. w ]. degree.C. and less than [ a-3 (N-1). + -. w ]. degree.C., there are several temperatures that do not cause deposition of precipitate. Therefore, the final deposition temperature range can be made more accurate by detecting the temperature of the fluid when it enters the core holding unit 4.
Specifically, when it is detected that the nth permeability is different from the (N-1) th permeability by about 5% at the nth temperature (the set temperature of the heating unit 5), it may be determined that the deposition temperature range of the easily precipitated substance in the fluid is [ a-3(N-1) ± w ] ° c ] of the fluid entering the inlet of the core holding unit 4, where the temperature of the fluid entering the inlet of the core holding unit 4 is the temperature displayed by the second temperature detection unit 10.
It can be understood that when the second temperature detecting unit 10 is included, the second temperature detecting unit 10 can be made to communicate with the conduit between the first pressure detecting unit 2 and the inlet of the core holding unit 4, and as the distance between the communication and the inlet of the core holding unit 4 is shortened, the deposition temperature of the easily precipitated substances can be further accurately determined.
It can be understood that the second temperature detection unit 10 can be provided on the basis of the fourth embodiment.
The device design benefit of this embodiment, moreover, the steam generator is simple in structure, low in manufacturing cost, and through set up the fluidic temperature of 4 entrances of second temperature detecting element 10 detection core clamping element at 4 entrances of core clamping element, thereby help further improving the precision of testing result, consequently, can be used for deposit temperature and the deposit volume of the easy precipitate of natural gas of survey at the oil gas field site, and through the in-service use, its experiment precision also can satisfy the on-the-spot design demand of gas field completely, practiced thrift a large amount of manpowers for the gas field development, financial resources and material resources, also made certain contribution for the further research of oil gas rerum natura test.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (10)
1. A device for detecting deposition temperature and deposition amount of easily precipitated substances in oil gas is characterized by comprising an oil gas storage unit, a first pressure detection unit, a second pressure detection unit, a rock core clamping unit, a heating unit, a first temperature detection unit and a flow detection unit; the core clamping unit is used for placing a core and isolating the core from the outside;
an outlet of the oil-gas storage unit is communicated with one end of the first pressure detection unit, the other end of the first pressure detection unit is communicated with an inlet of the core clamping unit, one end of the second pressure detection unit and the first temperature detection unit are respectively communicated with an outlet of the core clamping unit, and the other end of the second pressure detection unit is communicated with the flow detection unit;
the heating unit is used for heating and insulating the core clamping unit.
2. The apparatus for detecting deposition temperature and deposition amount of easily precipitated substances in oil and gas according to claim 1, characterized by further comprising a pressure reducing unit;
one end of the pressure reducing unit is communicated with an outlet of the oil-gas storage unit, and the other end of the pressure reducing unit is communicated with the first pressure detection unit.
3. The apparatus for detecting deposition temperature and deposition amount of easily precipitated substances in oil and gas according to claim 2, characterized by further comprising a drying unit;
the drying unit is used for drying the fluid output by the oil and gas storage unit.
4. The apparatus for detecting deposition temperature and deposition amount of easily precipitated substances in hydrocarbon according to any one of claims 1 to 3, characterized by further comprising a second temperature detecting unit;
and the second temperature detection unit is communicated with an inlet of the core clamping unit.
5. The apparatus of claim 1, wherein the core has a permeability k1And k is not less than 0.011＜10mD。
6. The apparatus of claim 5, wherein the core has a permeability k1And k is not less than 0.011＜0.5mD。
7. The apparatus of claim 1, wherein the core has a permeability k2And k is more than or equal to 102＜100mD。
8. The apparatus of claim 7, wherein the core has a permeability k2And k is more than or equal to 102＜50mD。
9. The device for detecting the deposition temperature and the deposition amount of the easily precipitated substances in the oil gas according to claim 1, wherein the core holding unit comprises a high-pressure steel pipe with a circular cross section and plugs for plugging two ends of the high-pressure steel pipe;
the pressure resistance of the high-pressure steel pipe is greater than 20 MPa.
10. The apparatus of claim 3, wherein said drying unit comprises a desiccant.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112816359A (en) * | 2021-01-06 | 2021-05-18 | 西南石油大学 | Device and method for determining solid deposition amount of crude oil in solid-phase deposition oil reservoir |
| CN113075081A (en) * | 2021-04-08 | 2021-07-06 | 西南石油大学 | Device and method for measuring solid phase deposition amount in multiple contact processes of injected gas and crude oil |
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2019
- 2019-04-22 CN CN201920550802.8U patent/CN210136160U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112816359A (en) * | 2021-01-06 | 2021-05-18 | 西南石油大学 | Device and method for determining solid deposition amount of crude oil in solid-phase deposition oil reservoir |
| CN113075081A (en) * | 2021-04-08 | 2021-07-06 | 西南石油大学 | Device and method for measuring solid phase deposition amount in multiple contact processes of injected gas and crude oil |
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