CN110778315B - Oil well shaft degassing diagnosis method - Google Patents
Oil well shaft degassing diagnosis method Download PDFInfo
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- CN110778315B CN110778315B CN201810842638.8A CN201810842638A CN110778315B CN 110778315 B CN110778315 B CN 110778315B CN 201810842638 A CN201810842638 A CN 201810842638A CN 110778315 B CN110778315 B CN 110778315B
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- 238000007872 degassing Methods 0.000 title claims abstract description 146
- 239000003129 oil well Substances 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000003745 diagnosis Methods 0.000 title abstract description 28
- 239000012530 fluid Substances 0.000 claims abstract description 133
- 238000005259 measurement Methods 0.000 claims abstract description 44
- 239000010779 crude oil Substances 0.000 claims abstract description 43
- 238000012545 processing Methods 0.000 claims description 22
- 229920006395 saturated elastomer Polymers 0.000 claims description 3
- 238000011084 recovery Methods 0.000 abstract description 9
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- 238000012360 testing method Methods 0.000 description 8
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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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or 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
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
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Abstract
The invention provides a degassing diagnosis method and a degassing diagnosis device for a shaft of an oil well, which are characterized in that the density of fluid at different depths in the oil well to be diagnosed is obtained; judging whether the crude oil is degassed according to the fluid densities at different depths, and acquiring the degassing point position if the crude oil is degassed; and acquiring saturation pressure according to the fluid pressure corresponding to the degassing point position. The method can reduce the measurement cost and improve the efficiency of obtaining the saturation pressure, so that measures can be taken quickly and effectively to prevent degassing and improve the recovery ratio.
Description
Technical Field
The invention relates to the technical field of oil and gas exploitation, in particular to a degassing diagnosis method and device for an oil well shaft.
Background
Under the condition of stratum, when the pressure is reduced to the pressure at which the natural gas begins to be separated from the crude oil, the pressure is called saturation pressure, the saturation pressure is very important for oil field development and is one of important indexes for determining development decision, and if the pressure is lower than the saturation pressure for production, an oil well is easy to degas, and the ultimate recovery rate is influenced. Therefore, the saturation pressure is an important parameter indispensable for calculating the geological reserves and compiling the oil field development scheme of the oil field.
At present, each oil field in China has no saturation pressure field test system, and the oil field is generally sampled on the site of a test oil well and then sent to a central laboratory for analysis and determination, so that the time and the cost are high, the saturation pressure cannot be obtained in time, and effective measures are taken to prevent the degassing of the oil well.
Disclosure of Invention
The invention provides a degassing diagnosis method and a degassing diagnosis device for an oil well shaft, which are used for improving the efficiency of acquiring saturation pressure, reducing the measurement cost and facilitating the rapid and effective measures for preventing degassing.
One aspect of the present invention provides a method for diagnosing degassing of an oil well wellbore, the method comprising the steps of:
acquiring fluid densities at different depths in an oil well to be diagnosed;
judging whether the crude oil is degassed according to the fluid densities at the different depths, and acquiring the degassing point position if the crude oil is degassed;
and acquiring saturation pressure according to the fluid pressure corresponding to the degassing point position.
Further, the determining whether the crude oil is degassed according to the fluid densities at the different depths, and if the determining is degassing, acquiring a degassing point position specifically includes:
obtaining a relation curve of the fluid density and the depth according to the fluid density at the different depths;
judging whether an inflection point exists in the relation curve of the fluid density and the depth;
if the point exists, the degassing is judged, and the position of the degassing point is obtained according to the depth corresponding to the inflection point.
Further, the determining whether there is an inflection point in the relationship curve between the fluid density and the depth specifically includes:
acquiring slopes K1 and K2 of the fluid density-depth relation curve at any two adjacent first measurement depths and second measurement depths, wherein the first measurement depths are deeper than the second measurement depths;
if the absolute value of (K1-K2)/K1 is greater than a first threshold value, and the slope error of the curve of the relationship between the density and the depth of the fluid without degassing and K1 is smaller than a second threshold value, judging that an inflection point exists in the curve of the relationship between the density and the depth of the fluid;
the obtaining of the degassing point position according to the depth corresponding to the inflection point specifically includes:
acquiring a tangent intersection point of the first measurement depth and the second measurement depth in the fluid density-depth relation curve;
and taking the depth corresponding to the tangent intersection point as the depth corresponding to the inflection point, and acquiring the position of the degassing point according to the depth corresponding to the tangent intersection point.
Further, the obtaining the degassing point position according to the depth corresponding to the inflection point specifically includes:
and dividing the depth corresponding to the inflection point by a first safety factor to be used as the position of the degassing point.
Further, obtaining the saturation pressure according to the fluid pressure corresponding to the degassing point position specifically includes:
and multiplying the fluid pressure corresponding to the degassing point position by a second safety factor to obtain the saturation pressure.
Another aspect of the present invention provides a degassing diagnosis apparatus for an oil well wellbore, specifically comprising:
the acquisition module is used for acquiring the fluid density at different depths in the oil well to be diagnosed;
the processing module is used for judging whether the crude oil is degassed according to the fluid densities at the different depths, and acquiring the degassing point position if the crude oil is degassed; and acquiring saturation pressure according to the fluid pressure corresponding to the degassing point position.
Further, the processing module is specifically configured to:
obtaining a relation curve of the fluid density and the depth according to the fluid density at the different depths;
judging whether an inflection point exists in the relation curve of the fluid density and the depth;
if the point exists, the degassing is judged, and the position of the degassing point is obtained according to the depth corresponding to the inflection point.
Further, the processing module is specifically configured to:
acquiring slopes K1 and K2 of the fluid density-depth relation curve at any two adjacent first measurement depths and second measurement depths, wherein the first measurement depths are deeper than the second measurement depths;
if the absolute value of (K1-K2)/K1 is greater than a first threshold value, and the slope error of the curve of the relationship between the density and the depth of the fluid without degassing and K1 is smaller than a second threshold value, judging that an inflection point exists in the curve of the relationship between the density and the depth of the fluid;
the obtaining of the degassing point position according to the depth corresponding to the inflection point specifically includes:
acquiring a tangent intersection point of the first measurement depth and the second measurement depth in the fluid density-depth relation curve;
and taking the depth corresponding to the tangent intersection point as the depth corresponding to the inflection point, and acquiring the position of the degassing point according to the depth corresponding to the tangent intersection point.
Further, the processing module is specifically configured to:
and dividing the depth corresponding to the inflection point by a first safety factor to be used as the position of the degassing point.
Further, the processing module is specifically configured to:
and multiplying the fluid pressure corresponding to the degassing point position by a second safety factor to obtain the saturation pressure.
According to the method and the device for diagnosing the degassing of the oil well shaft, the density of the fluid at different depths in the oil well to be diagnosed is obtained; judging whether the crude oil is degassed according to the fluid densities at different depths, and acquiring the degassing point position if the crude oil is degassed; and acquiring the saturation pressure according to the fluid pressure corresponding to the degassing point position. The method can reduce the measurement cost and improve the efficiency of obtaining the saturation pressure, so that measures can be taken quickly and effectively to prevent degassing and improve the recovery ratio.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings 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 only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart of a method for degassing diagnosis in a well bore according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a fluid density versus depth curve provided by an embodiment of the present invention;
FIG. 3 is a flow chart of a method for degassing diagnosis in a well bore according to another embodiment of the present invention;
FIG. 4 is a block diagram of an oil well wellbore degassing diagnostic apparatus provided in accordance with an embodiment of the present invention;
fig. 5 is a block diagram of an oil well bore degassing diagnostic apparatus according to another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
FIG. 1 is a flow chart of a method for degassing diagnosis in a well bore according to an embodiment of the present invention. As shown in fig. 1, the present embodiment provides a degassing diagnosis method for an oil well shaft, which includes the following specific steps:
s101, obtaining the fluid density at different depths in the oil well to be diagnosed.
In this embodiment, the downhole storage type testing equipment can be lowered to the different depths of the oil well to be diagnosed through steel wire operation to acquire the flowing pressure data at the different depths of the oil well, wherein the flowing pressure data specifically can include data such as inclined depth, vertical depth, pressure gradient, fluid density, temperature and temperature gradient in the shaft, and the downhole data is played back and processed through the ground, so that the fluid density at the different depths of the oil well to be diagnosed can be acquired. Of course, other testing methods, such as wireline logging, etc., may be used, and are not described herein.
And S102, judging whether the crude oil is degassed according to the fluid densities at different depths, and acquiring the degassing point position if the crude oil is degassed.
In this embodiment, extensive downhole testing and data analysis reveals that: when crude oil is not degassed in a shaft, the density of fluid in the shaft is influenced by the temperature of the shaft, the temperature is lower when the crude oil is closer to the ground, the density of the crude oil is higher, and a relation curve of the density of the fluid in the shaft and the depth is an upward straight line from the bottom of the shaft to the top of the shaft, namely, no inflection point exists; when crude oil is degassed in a shaft, fluid at the degassing point begins to be gas-liquid two phases, the density of the fluid in the shaft becomes low, a relation curve of the density of the fluid in the shaft and the depth tends to fall from the degassing point to the wellhead, namely, an inflection point appears near the degassing point on the relation curve of the density of the fluid and the depth, and the slope from the degassing point to the wellhead changes relative to the slope from the bottom to the degassing point, as shown in fig. 2, for a certain oil well, a flow gradient of pressure recovery at 06, 19 th day in 2012 and a static gradient of pressure recovery at 19, 06, 19 th day in 2012 can prove that the relation curve of the density of the fluid and the depth does not have the inflection point when the crude oil is not degassed in the shaft; and the other three prove that the curve of the relation between the density and the depth of the fluid has an inflection point when the crude oil is degassed in the well bore. According to the rule, whether the crude oil is degassed or not can be judged by judging whether an inflection point exists in a relation curve of the fluid density and the depth, if the inflection point exists, the crude oil is degassed in the shaft, the position near the inflection point can be used as the position of the degassing point, specifically, the position of the inflection point can be directly used as the position of the degassing point, and the position of the inflection point can be divided by a preset first safety factor and then used as the position of the degassing point. Of course, other methods can be used to determine whether the crude oil is degassed according to the above rules, and the details are not repeated here.
S103, acquiring saturation pressure according to the fluid pressure corresponding to the degassing point position.
In this embodiment, after the degassing point position is obtained, saturation pressure may be obtained according to the fluid pressure corresponding to the degassing point position, specifically, the fluid pressure corresponding to the degassing point position may be directly used as the saturation pressure, or the fluid pressure corresponding to the degassing point position may be multiplied by a preset second safety factor to be used as the saturation pressure.
According to the degassing diagnosis method for the oil well shaft, the densities of fluids at different depths in the oil well to be diagnosed are obtained; judging whether the crude oil is degassed according to the fluid densities at different depths, and acquiring the degassing point position if the crude oil is degassed; and acquiring the saturation pressure according to the fluid pressure corresponding to the degassing point position. The method of the embodiment can reduce the measurement cost and improve the efficiency of obtaining the saturation pressure so as to quickly and effectively take measures to prevent degassing and improve the recovery ratio.
FIG. 3 is a flow chart of a method for degassing diagnosis in a well bore according to an embodiment of the present invention. As shown in fig. 3, on the basis of the above embodiments, the present embodiment provides a degassing diagnosis method for an oil well wellbore, which includes the following specific steps:
s201, obtaining the fluid density at different depths in the oil well to be diagnosed.
In this embodiment, the downhole storage type testing equipment is lowered to the different depths of the oil well to be diagnosed through steel wire operation, so as to acquire the flowing pressure data at the different depths of the oil well, wherein the flowing pressure data specifically comprises data such as inclined depth, vertical depth, pressure gradient, fluid density, temperature and temperature gradient in the shaft, and the downhole data is played back and processed through the ground, so that the fluid density at the different depths of the oil well to be diagnosed can be acquired.
S202, obtaining a relation curve of the fluid density and the depth according to the fluid density at different depths.
In this embodiment, a relationship curve of the fluid density and the depth is fitted by performing data analysis on the acquired fluid densities at different depths in the oil well to be diagnosed, wherein the fitting method may be any existing fitting method.
And S203, judging whether an inflection point exists in the relation curve of the fluid density and the depth.
In this embodiment, since the curve of the relationship between the fluid density and the depth is an upward straight line from the bottom to the top of the well when the crude oil is not degassed in the wellbore, there is no inflection point, and the curve of the relationship between the fluid density and the depth when the crude oil is degassed in the wellbore has an inflection point near the degassing point, it can be determined whether the crude oil is degassed in the wellbore by determining whether there is an inflection point in the curve of the relationship between the fluid density and the depth.
More specifically, the determining whether there is an inflection point in the curve of the relationship between the fluid density and the depth may specifically include:
acquiring slopes K1 and K2 of the fluid density-depth relation curve at any two adjacent first measurement depths and second measurement depths, wherein the first measurement depths are deeper than the second measurement depths;
if the absolute value of (K1-K2)/K1 is greater than a first threshold value, and the slope error of the curve of the relationship between the density and the depth of the fluid without degassing and K1 is less than a second threshold value, judging that an inflection point exists in the curve of the relationship between the density and the depth of the fluid.
In this embodiment, the flow pressure data may be acquired in a predetermined step length in the depth direction, that is, the obtained fluid density also corresponds to the depth of the predetermined step length, the slope of the relationship curve between the fluid density and the depth at any two adjacent first measurement depths and second measurement depths is obtained, the two slopes are compared, whether an inflection point exists is determined by determining whether there is a slope change, for example, the slope at the first measurement depth is K1, and the slope at the second measurement depth is K2, where the first measurement depth is deeper than the second measurement depth, when the absolute value of (K1-K2)/K1 is greater than a first threshold and the slope error of the relationship curve between the K1 and the fluid density when the fluid density and the depth are not degassed is less than a second threshold, the first threshold may be set to 5%, the second threshold is set to 2%, that is, the relationship curve between the fluid density and the depth exists an inflection point, and the inflection point is located between the first measurement depth and the second measurement depth.
And S204, if the position exists, determining that the degassing is performed, and acquiring the position of the degassing point according to the depth corresponding to the inflection point.
In this embodiment, the position of the degassing point is obtained according to the depth corresponding to the inflection point by obtaining the depth corresponding to the inflection point of the curve of the relationship between the fluid density and the depth. Specifically, the depth corresponding to the inflection point position may be directly used as the degassing point position, or the depth corresponding to the inflection point position may be divided by a preset first safety factor and then used as the degassing point position.
More specifically, the obtaining the degassing point position according to the depth corresponding to the inflection point specifically includes:
acquiring a tangent intersection point of the first measurement depth and the second measurement depth in the fluid density-depth relation curve;
and taking the depth corresponding to the tangent intersection point as the depth corresponding to the inflection point, and acquiring the position of the degassing point according to the depth corresponding to the tangent intersection point.
That is, after it is determined that there is a change in slope by the slopes K1 and K2, and it is determined that there is an inflection point, an intersection of tangents at the first measurement depth and the second measurement depth in the fluid density-depth relationship curve is obtained, and a depth corresponding to the intersection of tangents is taken as a depth corresponding to the inflection point.
S205, acquiring a saturation pressure according to the fluid pressure corresponding to the degassing point position.
In this embodiment, after the degassing point position is obtained, the saturation pressure may be obtained according to the fluid pressure corresponding to the degassing point position, specifically, the fluid pressure corresponding to the degassing point position may be directly used as the saturation pressure, or the fluid pressure corresponding to the degassing point position may be multiplied by a preset second safety factor to be used as the saturation pressure.
According to the method provided by the embodiment, the degassing diagnosis of the shaft is carried out on a certain oil well, the final degassing of crude oil in the shaft is carried out, the degassing pressure, namely the saturation pressure is 23.0MPa, the field sampling of the well is carried out, the PVT test is carried out, the saturation pressure is 25.9MPa, and the method provided by the embodiment has higher accuracy through comparison verification.
In the embodiment, the degassing pressure value is smaller than the actual saturation pressure because the temperature of the degassing point in the shaft is lower than that of the stratum, but the difference is small (1-2 MPa) when the degassing point is close to the bottom of the well, and the conversion can be considered through a safety factor.
That is, the obtaining the degassing point position according to the depth corresponding to the inflection point specifically includes: dividing the depth corresponding to the inflection point by a first safety factor to be used as the position of the degassing point; and/or
The obtaining of the saturation pressure according to the fluid pressure corresponding to the degassing point position specifically includes: and multiplying the fluid pressure corresponding to the degassing point position by a second safety factor to obtain the saturated pressure.
In the present embodiment, the first safety factor may be 1.1, and the second safety factor may be 1.2, for example, the depth corresponding to the inflection point is 3300M, the fluid pressure corresponding to the inflection point is 23.0M, 3300M/1.1 ═ 3000M may be set as the degassing point position, and 23.0MPa × 1.2 ═ 27.6MPa may be set as the saturation pressure in the above embodiment. Of course, the first safety factor and the second safety factor may be corrected according to actual measurements.
According to the degassing diagnosis method for the oil well shaft, the densities of fluids at different depths in the oil well to be diagnosed are obtained; judging whether the crude oil is degassed according to the fluid densities at different depths, and acquiring the degassing point position if the crude oil is degassed; and acquiring the saturation pressure according to the fluid pressure corresponding to the degassing point position. The method of the embodiment can reduce the measurement cost and improve the efficiency of obtaining the saturation pressure so as to quickly and effectively take measures to prevent degassing and improve the recovery ratio.
Fig. 4 is a block diagram of an oil well wellbore degassing diagnosis apparatus according to an embodiment of the present invention. The embodiment provides an oil well shaft degassing diagnosis device, which can execute the processing flow provided by the above oil well shaft degassing diagnosis method, as shown in fig. 4, the oil well shaft degassing diagnosis device provided by the embodiment includes an acquisition module and a control module.
The system comprises an acquisition module, a diagnosis module and a diagnosis module, wherein the acquisition module is used for acquiring fluid densities at different depths in an oil well to be diagnosed;
the processing module is used for judging whether the crude oil is degassed according to the fluid densities at the different depths, and acquiring the degassing point position if the crude oil is degassed; and acquiring saturation pressure according to the fluid pressure corresponding to the degassing point position.
In this embodiment, the downhole storage type testing equipment can be lowered to the different depths of the oil well to be diagnosed through steel wire operation to acquire the flowing pressure data at the different depths of the oil well, wherein the flowing pressure data specifically can include data such as inclined depth, vertical depth, pressure gradient, fluid density, temperature and temperature gradient in the shaft, and the downhole data is played back through the acquisition module and processed, so that the fluid density at the different depths of the oil well to be diagnosed can be acquired. Then, judging whether the curve of the relationship between the fluid density and the depth has an inflection point by the processing module to judge whether the crude oil is degassed, if so, indicating that the crude oil is degassed in the shaft, and using the position near the inflection point as the degassing point position; after the processing module acquires the degassing point position, saturation pressure can be acquired according to the fluid pressure corresponding to the degassing point position, specifically, the fluid pressure corresponding to the degassing point position can be directly used as the saturation pressure, and the fluid pressure corresponding to the degassing point position can also be used as the saturation pressure after being multiplied by a preset second safety factor.
Further, the processing module is specifically configured to:
obtaining a relation curve of the fluid density and the depth according to the fluid densities at the different depths;
judging whether an inflection point exists in the relation curve of the fluid density and the depth;
if the point exists, the degassing is judged, and the position of the degassing point is obtained according to the depth corresponding to the inflection point.
Further, the processing module is specifically configured to:
acquiring slopes K1 and K2 of the fluid density-depth relation curve at any two adjacent first measuring depths and second measuring depths, wherein the first measuring depths are deeper than the second measuring depths;
if the absolute value of (K1-K2)/K1 is greater than a first threshold value, and the slope error of the curve of the relationship between the density and the depth of the fluid without degassing and K1 is smaller than a second threshold value, judging that an inflection point exists in the curve of the relationship between the density and the depth of the fluid;
the obtaining of the degassing point position according to the depth corresponding to the inflection point specifically includes:
acquiring a tangent intersection point of the first measurement depth and the second measurement depth in the fluid density-depth relation curve;
and taking the depth corresponding to the tangent intersection point as the depth corresponding to the inflection point, and acquiring the position of the degassing point according to the depth corresponding to the tangent intersection point.
Further, the processing module is specifically configured to:
and dividing the depth corresponding to the inflection point by a first safety factor to be used as the position of the degassing point.
Further, the processing module is specifically configured to:
and multiplying the fluid pressure corresponding to the degassing point position by a second safety factor to obtain the saturation pressure.
The degassing diagnosis device for the oil well shaft provided by the embodiment of the invention can be specifically used for executing the method embodiment provided by the above-mentioned fig. 1 and fig. 3, and the specific functions are not described again here.
According to the degassing diagnosis device for the oil well shaft, the densities of fluids at different depths in the oil well to be diagnosed are obtained; judging whether the crude oil is degassed according to the fluid densities at different depths, and acquiring the degassing point position if the crude oil is degassed; and acquiring saturation pressure according to the fluid pressure corresponding to the degassing point position. The device of this embodiment can reduce the survey cost, improves the efficiency of obtaining saturation pressure to in quick effectual taking measures prevents the degasification, the increase recovery ratio.
Fig. 5 is a block diagram of an oil well wellbore degassing diagnosis apparatus according to another embodiment of the present invention. As shown in fig. 5, the present embodiment provides an oil well shaft degassing diagnosis apparatus, comprising: a processor 400; a memory 401; and a computer program.
The computer program is stored in the memory 401 and configured to be executed by the processor 400 to implement the processing procedure provided in the method embodiment shown in fig. 1 or fig. 3, and specific functions are not described herein again.
More specifically, the apparatus further comprises a receiver 402 and a transmitter 403, which may be connected to the processor 400 and the memory 401, respectively, via a bus. The bus may be an ISA bus, a PCI bus, an EISA bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. The receiver 402 and the transmitter 403 may be used for reception and transmission of data and control instructions, respectively.
More specifically, Memory 401 may comprise a Random Access Memory (RAM) and may also comprise a non-volatile Memory, such as at least one disk Memory.
The memory 401 is used for storing a computer program, the processor 400 executes the computer program after receiving an execution instruction, and the method executed by the apparatus defined by the flow disclosed in any of the foregoing embodiments may be applied to the processor 400, or implemented by the processor 400.
According to the degassing diagnosis device for the oil well shaft, the densities of fluids at different depths in the oil well to be diagnosed are obtained; judging whether the crude oil is degassed according to the fluid densities at different depths, and acquiring the degassing point position if the crude oil is degassed; and acquiring the saturation pressure according to the fluid pressure corresponding to the degassing point position. The device of this embodiment can reduce the survey cost, improves the efficiency of obtaining saturation pressure to in quick effectual taking measures prevents the degasification, the increase recovery ratio.
In the several embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit may be implemented in the form of hardware, or in the form of hardware plus a software functional unit.
The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) or a processor (processor) to execute some steps of the methods according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
It is obvious to those skilled in the art that, for convenience and simplicity of description, the foregoing division of the functional modules is merely used as an example, and in practical applications, the above function distribution may be performed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to perform all or part of the above described functions. For the specific working process of the device described above, reference may be made to the corresponding process in the foregoing method embodiment, which is not described herein again.
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; while the invention has been described in detail and with reference to the foregoing embodiments, it will 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; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. A method of diagnosing degassing in an oil well wellbore, comprising:
acquiring fluid densities at different depths in an oil well to be diagnosed;
judging whether the crude oil is degassed according to the fluid densities at the different depths, and acquiring the degassing point position if the crude oil is degassed;
acquiring saturation pressure according to the fluid pressure corresponding to the degassing point;
whether the crude oil is degassed is judged according to the fluid densities at the different depths, and if the crude oil is degassed, the degassing point position is obtained, and the method specifically comprises the following steps:
obtaining a relation curve of the fluid density and the depth according to the fluid density at the different depths;
judging whether an inflection point exists in the relation curve of the fluid density and the depth;
if the position exists, the degassing is judged, and the position of the degassing point is obtained according to the depth corresponding to the inflection point;
the judging whether the curve of the relationship between the fluid density and the depth has an inflection point specifically comprises the following steps:
acquiring slopes K1 and K2 of the fluid density-depth relation curve at any two adjacent first measuring depths and second measuring depths, wherein the first measuring depths are deeper than the second measuring depths;
if the absolute value of (K1-K2)/K1 is greater than a first threshold value, and the slope error of the curve of the relationship between the density and the depth of the fluid without degassing and K1 is less than a second threshold value, judging that an inflection point exists in the curve of the relationship between the density and the depth of the fluid.
2. The method according to claim 1, wherein the obtaining the degassing point position according to the depth corresponding to the inflection point comprises:
acquiring a tangent intersection point of the first measurement depth and the second measurement depth in the relation curve of the fluid density and the depth;
and taking the depth corresponding to the tangent intersection point as the depth corresponding to the inflection point, and acquiring the position of the degassing point according to the depth corresponding to the tangent intersection point.
3. The method according to claim 1, wherein the obtaining the degassing point position according to the depth corresponding to the inflection point comprises:
and dividing the depth corresponding to the inflection point by a first safety factor to be used as the position of the degassing point.
4. The method according to any one of claims 1 to 3, wherein the obtaining of the saturation pressure from the fluid pressure corresponding to the degassing point position comprises:
and multiplying the fluid pressure corresponding to the degassing point position by a second safety factor to obtain the saturated pressure.
5. An oil well wellbore degassing diagnostic apparatus comprising:
the acquiring module is used for acquiring the fluid density at different depths in the oil well to be diagnosed;
the processing module is used for judging whether the crude oil is degassed according to the fluid densities at the different depths, and acquiring the degassing point position if the crude oil is degassed; acquiring saturation pressure according to the fluid pressure corresponding to the degassing point;
the processing module is specifically configured to:
obtaining a relation curve of the fluid density and the depth according to the fluid density at the different depths;
judging whether an inflection point exists in the relation curve of the fluid density and the depth;
if the position exists, the degassing is judged, and the position of the degassing point is obtained according to the depth corresponding to the inflection point;
acquiring slopes K1 and K2 of the fluid density-depth relation curve at any two adjacent first measurement depths and second measurement depths, wherein the first measurement depths are deeper than the second measurement depths;
if the absolute value of (K1-K2)/K1 is greater than a first threshold value, and the slope error of the curve of the relationship between the density and the depth of the fluid without degassing and K1 is less than a second threshold value, judging that an inflection point exists in the curve of the relationship between the density and the depth of the fluid.
6. The apparatus of claim 5, wherein the processing module is specifically configured to:
acquiring a tangent intersection point of the first measurement depth and the second measurement depth in the fluid density-depth relation curve;
and taking the depth corresponding to the tangent intersection point as the depth corresponding to the inflection point, and acquiring the position of the degassing point according to the depth corresponding to the tangent intersection point.
7. The apparatus according to claim 5, wherein the processing module is specifically configured to:
and dividing the depth corresponding to the inflection point by a first safety factor to be used as the position of the degassing point.
8. The apparatus according to any one of claims 5 to 7, wherein the processing module is specifically configured to:
and multiplying the fluid pressure corresponding to the degassing point position by a second safety factor to obtain the saturated pressure.
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