CN105484733A - Method and device for testing depth of gas-liquid interface - Google Patents
Method and device for testing depth of gas-liquid interface Download PDFInfo
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- CN105484733A CN105484733A CN201510923352.9A CN201510923352A CN105484733A CN 105484733 A CN105484733 A CN 105484733A CN 201510923352 A CN201510923352 A CN 201510923352A CN 105484733 A CN105484733 A CN 105484733A
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- gas
- pressure
- annular space
- oil well
- well annular
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/04—Measuring depth or liquid level
- E21B47/047—Liquid level
Abstract
The embodiment of the invention discloses a method and device for testing the depth of a gas-liquid interface. The method includes the steps of obtaining structural parameters of oil-well annular space; obtaining the pressure of first gas, wherein the first gas is the gas to be injected into the oil-well annular space; obtaining the pressure of second gas, wherein the second gas is the gas existing in the oil-well annular space before the first gas is injected, and the pressure of the first gas is larger than that of the second gas; injecting the first gas with the preset volume into the oil-well annular space; obtaining the pressure of third gas, wherein the third gas is the gas obtained after the injected first gas with the preset volume and the second gas are mixed in the oil-well annular space; obtaining the depth of the gas-liquid interface in the oil-well annular space according to the pressure of the first gas, the pressure of the second gas, the preset volume and the pressure of the third gas.
Description
Technical field
The application relates to oil exploration technology field, particularly a kind of gas-liquid interface depth test method and device.
Background technology
Usually, space oil well middle sleeve and instlated tubular or sleeve pipe and oil pipe formed is as the annular space of oil well.In the process of oil exploitation, need to test the interface depth of gas and liquid in oil well annular space, to adjust the operational parameter of this oil well and mining type.At present, echo method is mainly utilized to test the gas-liquid interface degree of depth in oil well annular space.Its detailed process is generally: at well head explosive and the microphone of oil well.Utilize the sounding of explosive charge as sound source, the time of record explosive charge.The sound wave sent by this sound source from the well head of oil well annularly space propagate downwards, produce back wave after running into the liquid-gas interface in annular space.This back wave annularly space is propagated to the well head direction of oil well.Utilize microphone to receive the back wave being transmitted to well head, and record receive the time of back wave first.Received the time difference of back wave by calculating explosive charge and microphone, determine the degree of depth of gas-liquid interface in annular space.
Realizing in the application's process, inventor finds that in prior art, at least there are the following problems:
In the process utilizing echo method to test the gas-liquid interface degree of depth in oil well annular space, test site has more noise usually, but microphonic sensitivity is usually not high, cannot accurately tell the back wave being transmitted to well head, cause the back wave time received first of record inaccurate, thus make the accuracy of the gas-liquid interface degree of depth finally determined not high.In addition, the blast of explosive has danger, and above-mentioned echo method cannot meet the needs of handling safety usually.
Summary of the invention
The object of the embodiment of the present application is to provide a kind of gas-liquid interface depth test method and device, while meeting processing safety, improves the accuracy of gas-liquid interface depth test result.
For solving the problems of the technologies described above, the embodiment of the present application provides a kind of gas-liquid interface depth test method and device to be achieved in that
A kind of gas-liquid interface depth test method, comprising:
Obtain the structural parameters of oil well annular space;
Obtain the pressure of the first gas, described first gas is the gas of described oil well annular space to be implanted;
Obtain the pressure of the second gas, described second gas is the gas before injection first gas in described oil well annular space, and the pressure of described first gas is greater than the pressure of described second gas;
The first gas of preset vol is injected in described oil well annular space;
Obtain the pressure of the 3rd gas, described 3rd gas is after the first gas injecting preset vol, the gas in described oil well annular space after the first gas and the second gas and vapor permeation;
According to the pressure of the pressure of the structural parameters of described oil well annular space, described first gas, the pressure of described second gas, described preset vol and described 3rd gas, obtain the degree of depth of gas-liquid interface in described oil well annular space.
A kind of gas-liquid interface depth test and device, comprising:
First acquisition module, for obtaining the structural parameters of oil well annular space;
Second acquisition module, for obtaining the pressure of the first gas, described first gas is the gas of described oil well annular space to be implanted;
3rd acquisition module, for obtaining the pressure of the second gas, described second gas is the gas before injection first gas in described oil well annular space, and the pressure of described first gas is greater than the pressure of described second gas;
Injection module, for injecting the first gas of preset vol in described oil well annular space;
4th acquisition module, for obtaining the pressure of the 3rd gas, described 3rd gas is after the first gas injecting preset vol, the gas in described oil well annular space after the first gas and the second gas and vapor permeation;
5th acquisition module, for the pressure of the pressure of the structural parameters according to described oil well annular space, described first gas, the pressure of described second gas, described preset vol and described 3rd gas, obtain the degree of depth of gas-liquid interface in described oil well annular space.
The technical scheme provided from above the embodiment of the present application, the embodiment of the present application according to the pressure of the pressure of the pressure of the structural parameters of oil well annular space, the first gas, the second gas, preset vol and the 3rd gas, can obtain the degree of depth of gas-liquid interface in described oil well annular space.Compared with prior art, the method of the embodiment of the present application does not need to use explosive charge to send sound wave, and do not need to use microphone to receive the back wave being transmitted to well head, thus while meeting processing safety, the accuracy of gas-liquid interface depth test result can be improved.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, the accompanying drawing that the following describes is only some embodiments recorded in the application, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the flow chart of the embodiment of the present application gas-liquid interface depth test method;
Fig. 2 is the schematic diagram of the embodiment of the present application gas-liquid interface depth test method;
Fig. 3 is the functional block diagram of the embodiment of the present application gas-liquid interface depth test device.
Detailed description of the invention
Technical scheme in the application is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present application, technical scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment is only some embodiments of the present application, instead of whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all should belong to the scope of the application's protection.
Usually, after oil gas well drilling completes, in order to prevent cave-in from blocking well head, can cement the well to Oil/gas Well.The process of well cementation is generally be lowered in the wellhole of Oil/gas Well by sleeve pipe, and then between sleeve pipe and the borehole wall, joints cement is fixed to carry out sealing to the space between sleeve pipe and the borehole wall.Oil pipe is entered under finally in sleeve pipe.Like this, the space that oil well inner sleeve and oil pipe can be formed is as the annular space of oil well.
But for the Oil/gas Well of heavy crude producing, heat insulation in order to realize, usually can also in sleeve pipe under enter instlated tubular, and in the annular space that instlated tubular and sleeve pipe are formed filled media, such as water or air etc., to reduce the loss of heat.Instlated tubular is made up of inner and outer tubes usually.Be heat insulation layer between the inner and outer tubes of instlated tubular, its inside can be vacuum, or can be filled with thermal insulation material.Like this, the space that oil well inner sleeve and instlated tubular can be formed is as the annular space of oil well.
Usually, the top of oil well annular space is gas, and bottom is liquid.This liquid can be oil or oil water mixture.Gas in annular space and liquid can form an interface.The gas-liquid interface depth test method of the embodiment of the present application, can test the degree of depth of gas-liquid interface in oil well annular space.As shown in Figure 1, the method comprises:
S101: the structural parameters obtaining oil well annular space.
In some embodiments, the space that instlated tubular in oil well and sleeve pipe can be formed is as the annular space of oil well.So, the structural parameters of described oil well annular space can comprise the diameter of instlated tubular outer wall and the diameter of internal surface of sleeve pipe.
In other embodiments, the space that oil pipe in oil well and sleeve pipe can be formed is as the annular space of oil well.So, the structural parameters of described oil well annular space can comprise the diameter of oil-pipe external wall and the diameter of internal surface of sleeve pipe.
S102: the pressure obtaining the first gas, described first gas is the gas of described oil well annular space to be implanted.
Described first gas can be positioned at the device of stored-gas, such as, can be the gases such as nitrogen.The device of described stored-gas can be nitrogen cylinder etc.
S103: the pressure obtaining the second gas, described second gas is the gas before injection first gas in described oil well annular space, and the pressure of described first gas is greater than the pressure of described second gas.
Device for pressure measurement can be used to obtain the pressure of gas in oil well annular space before injection first gas.Wherein, the pressure of described first gas is greater than the pressure of described second gas.Like this, in follow-up step S104, the first gas can be injected in oil well annular space.
S104: the first gas injecting preset vol in described oil well annular space.
Particularly, the device of stored-gas can be used in oil well annular space to inject the first gas.In the process of injection first gas, the volume injecting the first gas in annular space can be measured by use traffic meter.After the volume injecting the first gas in annular space equals preset vol, injection first gas can be stopped.
It should be noted that, described preset vol is under the pressure state of described first gas, injects the volume of the first gas in oil well annular space.
S105: obtain the pressure of the 3rd gas, described 3rd gas is after the first gas injecting preset vol, the gas in described oil well annular space after the first gas and the second gas and vapor permeation.
The pressure of the first gas is greater than the pressure of the second gas.Therefore, injecting the process of the first gas in oil well annular space, in annular space, the pressure of gas can raise.After the first gas injecting preset vol, the pressure of the 3rd gas in device for pressure measurement measure annular space can be used.
S106: according to the pressure of the pressure of the structural parameters of described oil well annular space, described first gas, the pressure of described second gas, described preset vol and described 3rd gas, obtain the degree of depth of gas-liquid interface in described oil well annular space.
According to the pressure of the pressure of described first gas, the pressure of described second gas, described preset vol and described 3rd gas, the volume of the 3rd gas in oil well annular space can be obtained.Then according to the volume of described 3rd gas, and the structural parameters of described oil well annular space, obtain the degree of depth of gas-liquid interface in described oil well annular space.
Particularly, the gas on annular space top can be considered as perfect gas.Like this, based on the equation of gas state, and according to the pressure of the pressure of described first gas, the pressure of described second gas, described preset vol and described 3rd gas, the volume of the 3rd gas in oil well annular space can be obtained by following formula (1).
In formula (1),
V
1for the volume of the 3rd gas in oil well annular space;
P
1be the pressure of the second gas;
P
2be the pressure of the 3rd gas;
V is the first gas of preset vol is P at pressure
1volume under state.
Further, V value can be obtained by following formula (2).
In formula (2),
P
0be the pressure of the first gas;
V
0for preset vol.
According to the volume of described 3rd gas, and the structural parameters of described oil well annular space, the degree of depth of gas-liquid interface in described oil well annular space can be obtained by following formula (3).
In formula (3),
H is the degree of depth of gas-liquid interface in oil well annular space, and unit is rice (m);
φ
1for the diameter of internal surface of sleeve pipe, unit is millimeter (mm);
φ
2for the diameter of instlated tubular outer wall or the diameter of oil-pipe external wall, unit is millimeter (mm).
Particularly, for above-mentioned formula (3), when the annular space of oil well is the space of instlated tubular and sleeve pipe composition in oil well, φ
2it can be the diameter of instlated tubular outer wall.When the annular space of oil well is the space of oil pipe and sleeve pipe composition in oil well, φ
2it can be the diameter of oil-pipe external wall.
Fig. 2 shows the schematic diagram of the gas-liquid interface depth test method of the embodiment of the present application.Wherein, 1 is nitrogen cylinder, and 2 is flow meter, and 3 is the inwall of sleeve pipe, and 4 is the outer wall of instlated tubular or oil pipe, and 5 is annular space, and 6 is the gas-liquid interface in annular space.
The gas-liquid interface depth test method of the embodiment of the present application, according to the pressure of the pressure of the pressure of the structural parameters of oil well annular space, the first gas, the second gas, preset vol and the 3rd gas, the degree of depth of gas-liquid interface in described oil well annular space can be obtained.Compared with prior art, the method of the embodiment of the present application does not need to use explosive charge to send sound wave, and do not need to use microphone to receive the back wave being transmitted to well head, thus while meeting processing safety, the accuracy of gas-liquid interface depth test result can be improved.
Further, the method of the embodiment of the present application is a kind of method of the indirectly testing gas-liquid interface degree of depth, only need to during each test in oil well annular space and inject a small amount of gas, just the degree of depth of gas-liquid interface in oil well annular space can be calculated, economical and practical and application facilitates, thus can reduce the construction cost of the test gas-liquid interface degree of depth.
The embodiment of the present application also provides a kind of gas-liquid interface depth test device, as shown in Figure 3, comprising:
First acquisition module 301, for obtaining the structural parameters of oil well annular space;
Second acquisition module 302, for obtaining the pressure of the first gas, described first gas is the gas of described oil well annular space to be implanted;
3rd acquisition module 303, for obtaining the pressure of the second gas, described second gas is the gas before injection first gas in described oil well annular space, and the pressure of described first gas is greater than the pressure of described second gas;
Injection module 304, for injecting the first gas of preset vol in described oil well annular space;
4th acquisition module 305, for obtaining the pressure of the 3rd gas, described 3rd gas is after the first gas injecting preset vol, the gas in described oil well annular space after the first gas and the second gas and vapor permeation;
5th acquisition module 306, for the pressure of the pressure of the structural parameters according to described oil well annular space, described first gas, the pressure of described second gas, described preset vol and described 3rd gas, obtain the degree of depth of gas-liquid interface in described oil well annular space.
System, device, module or unit that above-described embodiment is illustrated, specifically can be realized by computer chip or entity, or be realized by the product with certain function.
For convenience of description, various unit is divided into describe respectively with function when describing above device.Certainly, the function of each unit can be realized in same or multiple software and/or hardware when implementing the application.
Each embodiment in this manual all adopts the mode of going forward one by one to describe, between each embodiment identical similar part mutually see, what each embodiment stressed is the difference with other embodiments.Especially, for system embodiment, because it is substantially similar to embodiment of the method, so description is fairly simple, relevant part illustrates see the part of embodiment of the method.
The application can be used in numerous general or special purpose computing system environments or configuration.Such as: personal computer, server computer, handheld device or portable set, laptop device, multicomputer system, system, set top box, programmable consumer-elcetronics devices, network PC, minicom, mainframe computer, the DCE comprising above any system or equipment etc. based on microprocessor.
Although depict the application by embodiment, those of ordinary skill in the art know, the application has many distortion and change and do not depart from the spirit of the application, and the claim appended by wishing comprises these distortion and change and do not depart from the spirit of the application.
Claims (10)
1. a gas-liquid interface depth test method, is characterized in that, comprising:
Obtain the structural parameters of oil well annular space;
Obtain the pressure of the first gas, described first gas is the gas of described oil well annular space to be implanted;
Obtain the pressure of the second gas, described second gas is the gas before injection first gas in described oil well annular space, and the pressure of described first gas is greater than the pressure of described second gas;
The first gas of preset vol is injected in described oil well annular space;
Obtain the pressure of the 3rd gas, described 3rd gas is after the first gas injecting preset vol, the gas in described oil well annular space after the first gas and the second gas and vapor permeation;
According to the pressure of the pressure of the structural parameters of described oil well annular space, described first gas, the pressure of described second gas, described preset vol and described 3rd gas, obtain the degree of depth of gas-liquid interface in described oil well annular space.
2. the method for claim 1, it is characterized in that, the pressure of the pressure of the described structural parameters according to described oil well annular space, described first gas, the pressure of described second gas, described preset vol and described 3rd gas, obtain the degree of depth of gas-liquid interface in described oil well annular space, comprising:
According to the pressure of the pressure of described first gas, the pressure of described second gas, described preset vol and described 3rd gas, obtain the volume of the 3rd gas in oil well annular space;
According to the volume of described 3rd gas, and the structural parameters of described oil well annular space, obtain the degree of depth of gas-liquid interface in described oil well annular space.
3. method as claimed in claim 2, is characterized in that, the pressure of the described pressure according to described first gas, the pressure of described second gas, described preset vol and described 3rd gas, obtains the volume of the 3rd gas in oil well annular space, specifically comprises:
According to the pressure of the pressure of described first gas, the pressure of described second gas, described preset vol and described 3rd gas, obtained the volume of the 3rd gas in oil well annular space by following formula,
V
1for the volume of the 3rd gas in oil well annular space;
P
1be the pressure of the second gas;
P
2be the pressure of the 3rd gas;
V is the first gas of preset vol is P at pressure
1volume under state.
4. method as claimed in claim 3, is characterized in that,
wherein,
P
0be the pressure of the first gas;
V
0for preset vol.
5. method as claimed in claim 2, it is characterized in that, the described volume according to described 3rd gas, and the structural parameters of described oil well annular space, obtain the degree of depth of gas-liquid interface in described oil well annular space, specifically comprise:
According to the volume of described 3rd gas, and the structural parameters of described oil well annular space, the degree of depth of gas-liquid interface in described oil well annular space is obtained by following formula,
H is the degree of depth of gas-liquid interface in oil well annular space, and unit is rice;
φ
1for the diameter of internal surface of sleeve pipe, unit is millimeter;
φ
2for the diameter of instlated tubular outer wall or the diameter of oil-pipe external wall, unit is millimeter.
6. the method for claim 1, is characterized in that, the structural parameters of described oil well annular space comprise the diameter of instlated tubular outer wall and the diameter of internal surface of sleeve pipe in oil well.
7. the method for claim 1, is characterized in that, the structural parameters of described oil well annular space comprise the diameter of oil well inner oil tube outer wall and the diameter of internal surface of sleeve pipe.
8. the method for claim 1, is characterized in that, described first gas is nitrogen.
9. the method for claim 1, is characterized in that, described oil well annular space is the space of instlated tubular and sleeve pipe composition in oil well or the space of oil pipe and sleeve pipe composition.
10. gas-liquid interface depth test and a device, is characterized in that, comprising:
First acquisition module, for obtaining the structural parameters of oil well annular space;
Second acquisition module, for obtaining the pressure of the first gas, described first gas is the gas of described oil well annular space to be implanted;
3rd acquisition module, for obtaining the pressure of the second gas, described second gas is the gas before injection first gas in described oil well annular space, and the pressure of described first gas is greater than the pressure of described second gas;
Injection module, for injecting the first gas of preset vol in described oil well annular space;
4th acquisition module, for obtaining the pressure of the 3rd gas, described 3rd gas is after the first gas injecting preset vol, the gas in described oil well annular space after the first gas and the second gas and vapor permeation;
5th acquisition module, for the pressure of the pressure of the structural parameters according to described oil well annular space, described first gas, the pressure of described second gas, described preset vol and described 3rd gas, obtain the degree of depth of gas-liquid interface in described oil well annular space.
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| CN105484733B (en) | 2019-08-06 |
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