CN113375619A - Device and method for detecting corrosion and erosion states of gas production wellhead device - Google Patents
Device and method for detecting corrosion and erosion states of gas production wellhead device Download PDFInfo
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- CN113375619A CN113375619A CN202010157514.3A CN202010157514A CN113375619A CN 113375619 A CN113375619 A CN 113375619A CN 202010157514 A CN202010157514 A CN 202010157514A CN 113375619 A CN113375619 A CN 113375619A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 155
- 230000003628 erosive effect Effects 0.000 title claims abstract description 71
- 230000007797 corrosion Effects 0.000 title claims abstract description 43
- 238000005260 corrosion Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000001514 detection method Methods 0.000 claims abstract description 95
- 239000000523 sample Substances 0.000 claims abstract description 64
- 238000004458 analytical method Methods 0.000 claims description 42
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 6
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- 238000009659 non-destructive testing Methods 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
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- 229910001220 stainless steel Inorganic materials 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
- G01B21/08—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness for measuring thickness
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
- G01B17/02—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations for measuring thickness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/0002—Arrangements for supporting, fixing or guiding the measuring instrument or the object to be measured
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/0002—Arrangements for supporting, fixing or guiding the measuring instrument or the object to be measured
- G01B5/0004—Supports
Abstract
The invention relates to a device and a method for detecting corrosion and erosion states of a gas production wellhead device. Belong to natural gas exploitation technical field, the detection device of gas production wellhead assembly corruption and erosion state includes: the probe comprises a circumferential ring, a probe assembly and an axial positioning piece; one side edge of the probe assembly is connected with the outer edge of the circumferential ring, and the other end of the probe assembly is used for contacting with a piece to be detected; one end of each axial positioning piece is connected with the ring edge of the circumferential ring, and the other end of each axial positioning piece is used for acquiring the axial distance between the axial positioning piece and the piece to be measured; the circumferential ring is used for being sleeved on the piece to be tested. The method and the device can ensure that the same detection point position in the casing head, the tubing head and the gas production tree is tracked and detected for a long time, and further improve the accuracy of the detection result.
Description
Technical Field
The invention relates to the technical field of natural gas exploitation, in particular to a device and a method for detecting corrosion and erosion states of a gas production wellhead device.
Background
In natural gas exploitation, a gas production wellhead device is a master unit for controlling a gas well, and mainly comprises a casing head, a tubing head and a gas production tree. The gas production wellhead device can complete the functions of hanging an oil pipe, sealing an annular space and controlling a shaft, and ensures the safety production of a gas well. At present, the number of injection and production wells of high-sulfur gas wells, shale gas wells and gas storage reservoirs is increased day by day, different types of fluids produced in the gas wells have different corrosion and erosion effects on gas production wellhead devices, and the safety of the gas production wellhead devices faces huge challenges. Therefore, there is a need for a gas production wellhead detection device and method.
At present, the corrosion and erosion states of a gas production wellhead device are detected by scanning and detecting each part of a casing head, a tubing head and a gas production tree by means of ultrasonic detection equipment.
The inventors found that the related art has at least the following technical problems:
since it takes about 2 days to detect one well by the ultrasonic detection apparatus, the detection efficiency is low; meanwhile, due to human factors, the tracking detection of the same detection point position in the casing head, the tubing head and the gas production tree for a long time cannot be guaranteed.
Disclosure of Invention
The embodiment of the invention provides a device and a method for detecting the corrosion and erosion states of a gas production wellhead device, which can solve the problems that the detection efficiency is low because the detection of one well by ultrasonic detection equipment takes long time; meanwhile, due to human factors, the technical problem that the same detection point position in the gas production tree cannot be tracked and detected for a long time cannot be guaranteed. The specific technical scheme is as follows:
in one aspect, a gas production wellhead corrosion and erosion state detection device is provided, the gas production wellhead corrosion and erosion state detection device comprising: the probe comprises a circumferential ring, a probe assembly and an axial positioning piece;
one side edge of the probe assembly is connected with the outer edge of the circumferential ring, and the other end of the probe assembly is used for contacting with a piece to be detected;
one end of each axial positioning piece is connected with the ring edge of the circumferential ring, and the other end of each axial positioning piece is used for acquiring the axial distance between the axial positioning piece and the piece to be detected;
the circumferential ring is used for being sleeved on the piece to be tested.
In an alternative embodiment, the probe assembly comprises: the thickness measuring probe, the elastic component and the end cover;
one side edge of the thickness measuring probe is connected with the outer edge of the circumferential ring, and the other end of the thickness measuring probe is used for contacting with the piece to be measured;
the elastic component is positioned above the thickness measuring probe, and the end cover covers the elastic component.
In an optional embodiment, the apparatus further comprises: and one end of the connecting base is connected with the outer edge of the circumferential ring, and the other end of the connecting base is connected with one side edge of the thickness measuring probe.
In an alternative embodiment, the connection mount comprises: a first connection section, a second connection section and a third connection section;
one end of the first connecting section is connected with the second connecting section, the other end of the second connecting section is connected with the third connecting section, a first accommodating space is formed among the first connecting section, the second connecting section and the third connecting section, and the thickness measuring probe is located in the first accommodating space.
In an alternative embodiment, the first connecting section, the second connecting section and the third connecting section are integrally formed by stamping.
In an optional embodiment, the apparatus further comprises: and one end of the magnetic component is connected with the connecting base, and the other end of the magnetic component is connected with the outer edge of the circumferential ring.
In an alternative embodiment, the second connecting section has a second receiving space thereon, and the magnetic component is located in the second receiving space.
In an optional embodiment, the circumferential ring comprises: the first half ring, the second half ring and the connecting piece;
the first half ring is connected with the second half ring through the connecting piece, and the first half ring and the second half ring are used for being sleeved on the piece to be measured.
In another aspect, a method for detecting corrosion and erosion status of a gas production wellhead is provided, the method comprising:
obtaining the erosion influence of gas relative to a gas production wellhead to obtain a first analysis result;
acquiring the erosion influence of gas-liquid two phases on a gas production wellhead to obtain a second analysis result;
acquiring the erosion influence of gas-liquid-solid three phases on a gas production wellhead to obtain a third analysis result;
determining a weak part of the gas production wellhead device according to the first analysis result, the second analysis result and the third analysis result;
determining a detection point according to a weak part of the gas production wellhead device;
and the detection device and the ultrasonic detector are arranged on the detection point for detection.
In an alternative embodiment, the determining a weak point of the gas production wellhead comprises:
and taking the main drift diameter of the gas production tree, the side drift diameter turning area of the gas production tree and the flange connection area as the weak parts.
In an alternative embodiment, the mounting of the detecting device of any one of claims 1 to 7 and an ultrasonic detector on the detecting point for detection comprises:
the thickness of weak parts of a plurality of gas production wellhead devices is obtained through any one of the detection devices;
obtaining an average value of the thicknesses of the weak parts of the gas production wellhead devices according to the thicknesses of the weak parts of the gas production wellhead devices;
and taking the average value as a detection result.
Compared with the prior art, the technical scheme of the invention has the following advantages:
the device that this application embodiment provided, establish on the piece that awaits measuring through circumference ring cover, the probe subassembly through being connected with circumference ring offsets with the piece that awaits measuring, can detect out the thickness that awaits measuring the position, guarantee through a plurality of axial setting elements that probe subassembly and the firm counterbalance of the piece that awaits measuring, on the one hand, can avoid taking place the displacement, guarantee the detection accuracy of corruption and erosion position, on the other hand, can guarantee to follow tracks to the detection to the same detection site position in casing head, oil pipe head and the gas production tree for a long time based on the axial setting element, the accuracy of testing result has further been improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a gas production wellhead corrosion and erosion state detection device provided by an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a gas production wellhead corrosion and erosion detection device provided by an embodiment of the invention;
FIG. 3 is a schematic structural diagram of a gas production wellhead corrosion and erosion detection device provided by an embodiment of the invention;
FIG. 4 is a schematic structural diagram of a gas production wellhead corrosion and erosion detection device provided by an embodiment of the invention;
FIG. 5 is a schematic structural diagram of a gas production wellhead corrosion and erosion detection device provided by an embodiment of the invention;
FIG. 6 is a schematic flow chart of a method for detecting corrosion and erosion status of a gas production wellhead assembly according to an embodiment of the present invention;
FIG. 7 is a weak point distribution for a cross gas recovery wellhead provided by an embodiment of the present invention;
FIG. 8 is a distribution of weak locations for a Y-shaped gas recovery wellhead provided by an embodiment of the present invention;
FIG. 9 is a schematic diagram of a main path weakness location of a gas production tree provided by an embodiment of the present invention;
fig. 10 is a schematic diagram of a gas production tree side drift diameter weak position provided by an embodiment of the invention.
Reference numerals:
1-a circumferential ring, 11-a first half ring, 12-a second half ring, 100-a to-be-measured part, 2-a probe assembly, 21-a thickness measuring probe, 22-an elastic part, 23-an end cover, 3-an axial positioning part, 4-a connecting base, 41-a first connecting section, 42-a second connecting section, 43-a third connecting section and 5-a magnetic part.
Detailed Description
Unless defined otherwise, all technical terms used in the examples of the present invention have the same meaning as commonly understood by one of ordinary skill in the art.
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The damage of oil gas erosion to a gas production wellhead device is mainly embodied in two aspects: oil gas corrosion and erosion directly cause the abrasion of the inner wall of a gas production wellhead device, generally, fluid or solid particles impact the surface of the inner wall of the gas production wellhead device at a certain speed and angle to cause material damage, and finally the gas production wellhead device is damaged; the erosion can bring corrosion and mechanical interaction, and the formed metal is damaged, the typical mechanism is that a metal medium forms a protective film under the action of corrosion, the protective film is partially damaged under the action of shear stress formed by flowing, and the metal is corroded for a long time at the damaged part until perforation or burst.
The gas production wellhead device mainly comprises a casing head, a tubing head and a gas production tree. The gas production tree is mainly formed by combining four-way valves and valves with different types and sizes, wherein corrosion and leakage of the valves of the gas production tree are main reasons for accidents of the gas production tree. According to the actual production requirement, the gas production tree valve needs to be subjected to nondestructive testing regularly. The neck parts on two sides of the gas production tree valve at least detect 8 parts, and each neck part at least detects 4 areas. The neck parts on two sides of the gas production tree valve are subjected to single-point thickness measurement by adopting a single-point thickness gauge, the detection parts are recorded, and the neck parts on two sides of the valve are subjected to wall thickness change distribution conditions of the valve inner wall by adopting an ultrasonic detector. According to the requirements, the detection precision of the wall thickness of the valve needs to reach 0.1mm, and the detection precision of the defects of the inner wall of the valve and the defects of the sealing surface of the flange needs to reach 1mm x 1 mm. However, since it takes about 2 days to detect one well by the ultrasonic detection apparatus, the detection efficiency is low; meanwhile, due to human factors, the tracking detection of the same detection point position in the casing head, the tubing head and the gas production tree for a long time cannot be guaranteed. The device and the method provided by the embodiment of the application aim to solve the technical problem.
In one aspect, a device for detecting corrosion and erosion states of a gas production wellhead is provided, as shown in fig. 1, the device for detecting corrosion and erosion states of a gas production wellhead comprises: the device comprises a circumferential ring 1, a probe assembly 2 and an axial positioning piece 3;
one side edge of the probe assembly 2 is connected with the outer edge of the circumferential ring 1, and the other end of the probe assembly 2 is used for contacting with a piece to be tested 100;
one end of each axial positioning piece 3 is connected with the ring edge of the circumferential ring 1, and the other end of each axial positioning piece 3 is used for acquiring the axial distance from the piece to be detected 100;
the circumferential ring 1 is used for being sleeved on the piece to be measured 100.
The device provided by the embodiment of the application has the following technical effects:
the device that this application embodiment provided, establish on awaiting measuring 100 through circumference ring 1 cover, the probe subassembly 2 through being connected with circumference ring 1 offsets with awaiting measuring 100, can detect out the thickness that awaits measuring 100 positions, guarantee firmly offsetting of probe subassembly 2 and awaiting measuring 100 through a plurality of axial setting elements 3, on the one hand, can avoid taking place the displacement, guarantee the detection accuracy of erosion position, on the other hand, can guarantee to follow tracks the detection to the casing head for a long time, same detection point position among oil pipe head and the gas production tree based on axial setting element, the accuracy of testing result has further been improved.
The gas production wellhead corrosion and erosion status detection apparatus provided herein will be further described below by way of alternative embodiments.
The device provided in the embodiment of the present application may detect the erosion and corrosion state of the gas production tree, or may detect the erosion and corrosion state of a connection portion such as a pipe or a valve, and the application range of the device is not limited to this. That is, the object 100 to be tested in the embodiment of the present application is not limited to a gas production tree, a pipeline, a valve, or the like.
The circumferential ring 1 provided by the embodiment of the application can be determined according to the size of the piece to be measured 100. For example, when the diameter of the device under test 100 is larger, the diameter of the circumferential ring 1 may be larger so as to fit over the device under test 100. Because the detection device that this application embodiment provided detects gas production tree, valve or pipeline, and gas production tree, valve or pipeline most are located outdoors, perhaps will contact with oil gas, consequently, the material of circumference ring 1 can be stainless steel to improve detection device's life.
It should be noted that, because the circumferential ring 1 needs to be sleeved on the to-be-tested member 100, the fixing of the circumferential ring 1 is prevented from being affected by connecting one side edge of the probe assembly 2 with the outer edge of the circumferential ring 1.
In an alternative embodiment, as shown in fig. 2, the circumferential ring 1 comprises: a first half ring 11, a second half ring 12 and a connecting member 13;
the first half ring 11 and the second half ring 12 are connected through a connecting piece 13, and the first half ring 11 and the second half ring 12 are used for being sleeved on the to-be-tested piece 100.
It should be noted that, the first half ring 11 and the second half ring 12 provided in the embodiment of the present application may be semicircular hoops, that is, the first half ring 11 and the second half ring 12 may be two semicircular hoops. The two semicircular clamping bands are connected by a connecting piece 13. As an example, the connector 13 may be a snap. When the to-be-detected piece 100 needs to be detected, the first half ring 11 and the second half ring 12 are respectively sleeved on the to-be-detected piece 100, so that the installation efficiency of the detection device is improved. And when needing to be changed or dismantle, open the buckle of connecting first semi-ring 11 and second semi-ring 12 and can accomplish the dismantlement of device, improved the operating efficiency.
In an alternative embodiment, as shown in FIG. 3, the probe assembly 2 includes: a thickness measuring probe 21, an elastic part 22 and an end cover 23;
one side edge of the thickness measuring probe 21 is connected with the outer edge of the circumferential ring 1, and the other end of the thickness measuring probe is used for contacting with the piece to be measured 100;
the elastic part 22 is positioned above the thickness measuring probe 21, and the end cover 23 covers the elastic part 22.
It should be noted that the thickness measuring probe 21 dynamically measures the thickness of the workpiece 100 on line by using the induction synchronizer as a sensor. The thickness of the eroded part of the gas production tree, the pipeline or the valve is measured through the thickness measuring probe 21, and the detection device provided by the embodiment of the application performs fixed detection on the point, so that the position of a detection point for each detection of the gas production tree, the pipeline or the valve and the like is kept unchanged.
It should be noted that, the thickness of the gas production tree, the pipeline or the valve is obtained by the thickness measuring probe 21, and the thickness measuring probe 21 needs to be in contact with the gas production tree, the pipeline or the valve. Therefore, in order to make the gas production tree, the pipeline or the valve equal to the thickness measuring probe 21 to be in better contact with each other, an elastic component is arranged above the thickness measuring probe 21, acting force is exerted through the elastic component, and when the detection device works, the thickness measuring probe 21 is in better contact with the piece to be detected 100.
As an example, the elastic member may be a spring. The elastic force of the spring may be determined according to the needs of the thickness measuring probe 21, as long as the thickness measuring probe 21 can be brought into good contact with the object 100. The embodiment of the present application does not limit the elastic force of the spring.
By arranging the end cover 23 above the elastic component, on one hand, the spring can be ensured not to move randomly, and on the other hand, the safety of the thickness measuring probe 21 is ensured. As an example, the end cap 23 and the elastic member may be detachably connected, and as an example, the end cap 23 and the elastic member may be screwed or the like. The connection mode of the embodiment of the present application is not limited thereto.
As an example, one side of the thickness measuring probe 21 may be fixedly connected with the outer edge of the circumferential ring 1, and may be integrally formed or detachably connected, such as hinged.
In an alternative embodiment, as shown in fig. 3, the apparatus further comprises: and one end of the connecting base 4 is connected with the outer edge of the circumferential ring 1, and the other end of the connecting base 4 is connected with one side edge of the thickness measuring probe 21.
The circumferential ring 1 and the thickness measuring probe 21 are connected through the connecting base 4, and the stability of the detection device is guaranteed.
In an alternative embodiment, as shown in fig. 4, the connection base 4 comprises: a first connection section 41, a second connection section 42, and a third connection section 43;
one end of the first connecting section 41 is connected with the second connecting section 42, the other end of the second connecting section 42 is connected with the third connecting section 43, a first accommodating space is formed among the first connecting section 41, the second connecting section 42 and the third connecting section 43, and the thickness measuring probe 21 is positioned in the first accommodating space.
Referring to fig. 4, a first accommodating space is formed among the first connecting section 41, the second connecting section 42 and the third connecting section 43, and the thickness measuring probe 21 is located in the first accommodating space and connected to the thickness measuring probe 21 through the first connecting section 41 and the second connecting section 42. For example, the first connection section 41, the second connection section 42 and the thickness measuring probe 21 may be detachably connected, such as bolted connection, or the thickness measuring probe 21 may be provided with threads on the outer wall thereof, and the thickness measuring probe 21 may be connected with the first connection section 41 and the second connection section 42 by threads.
In an alternative embodiment, the first connecting section, the second connecting section and the third connecting section are integrally formed by stamping.
It should be noted that the first accommodating space cannot be too small, which may cause extrusion on the thickness measuring probe 21, and the first accommodating space cannot be too large, which may affect the connection stability between the first connecting section 41, the second connecting section 42 and the thickness measuring probe 21. As an example, the size of the first accommodating space may be adapted to the diameter of the thickness measuring probe 21.
In an alternative embodiment, as shown in fig. 5, the apparatus further comprises: and one end of the magnetic component 5 is connected with the connecting base 4, and the other end of the magnetic component 5 is connected with the outer edge of the circumferential ring 1.
By providing the magnetic member 5 between the connection base 4 and the circumferential ring 1, the connection stability between the connection base 4 and the circumferential ring 1 can be enhanced. By way of example, the magnetic means 5 can be placed between the connection seat 4 and the circumferential ring 1.
As an example, the magnetic member 5 may be a magnet. The embodiment of the present application is not limited to this.
In an alternative embodiment, the second connecting section 42 has a second receiving space therein, and the magnetic component 5 is located in the second receiving space.
Referring to fig. 5, a second receiving space is provided on the third connecting section 43, and the magnetic member 5 is placed in the second receiving space, so that the connection stability between the connection base 4 and the circumferential ring 1 is further enhanced.
In another aspect, a method for detecting corrosion and erosion states of a gas production wellhead is provided, as shown in fig. 6, the method comprising:
And 102, acquiring the erosion influence of the gas phase and the liquid phase on a gas production wellhead to obtain a second analysis result.
And 103, acquiring the erosion influence of the gas-liquid-solid three phases on a gas production wellhead to obtain a third analysis result.
And 104, determining a weak part of the gas production wellhead device according to the first analysis result, the second analysis result and the third analysis result.
And 105, determining a detection point according to the weak part of the gas production wellhead device.
And step 106, installing any one of the detection devices and the ultrasonic detector on the detection point for detection.
The methods provided by the embodiments of the present application will be further described below.
It will be appreciated that since the oil well may produce a pure gas, a mixture of gas and liquid phases, or a mixture of gas, liquid and solid phases, a distinction between each case is required. And respectively acquiring the erosion influence on a gas production wellhead during gas phase, gas-liquid two-phase and gas-liquid-solid three-phase.
It should be noted that the method adopts a finite element method to simulate erosion of different phase states of the gas production wellhead, so as to obtain erosion influences of gas phase, gas-liquid two-phase and gas-liquid-solid relative gas production wellhead, and further obtain an analysis result.
It should be noted that Finite Element Analysis (FEA) utilizes a mathematical approximation method to simulate a real physical system (geometric and load conditions). With simple and interacting elements (i.e., cells), a finite number of unknowns can be used to approximate a real system of infinite unknowns.
Finite element analysis is solved by replacing a complex problem with a simpler one. It considers the solution domain as consisting of a number of small interconnected subdomains called finite elements, assuming a suitable (simpler) approximate solution for each element, and then deducing the overall satisfaction conditions (e.g. structural equilibrium conditions) for solving this domain, to arrive at a solution to the problem. This solution is not an exact solution, but an approximate solution, since the actual problem is replaced by a simpler problem.
In the embodiment of the application, the actual problem of the erosion influence of gas phase, gas-liquid two-phase and gas-liquid-solid three-phase gas production well mouth is difficult to obtain accurate solution, and the finite element is high in calculation precision and can adapt to various complex shapes, so that the erosion shadow of substances in different phase states on the gas production well mouth is obtained through finite element analysis.
The common finite element software used for finite element analysis is ANSYS, SDRC/I-DEAS, etc. The embodiment of the present application does not limit which finite element software is used.
As an example, production data of a gas well to be tested, including production pressure, gas production, water production, and sand carrying capacity (shale gas well), is collected first. And establishing a physical model of the gas production wellhead by adopting a finite element method, and simulating according to actual production conditions. As an example, physical models of a vertical flow channel and a horizontal flow channel of a gas production wellhead can be drawn through finite element simulation software, grids are divided, then a single-phase flow, a gas-liquid two-phase flow and a gas-liquid-solid multi-phase flow model are adopted to carry out simulation calculation in the gas production wellhead simulation flow channel, the actual gas production rate, the liquid carrying amount and the sand output amount of a gas well are used as input parameters, and output results comprise gas phase flow rate, liquid phase flow rate, solid phase flow rate, turbulence intensity, shearing stress and the like. Under the condition of single-phase flow, the part with larger shearing force is a weak part for corrosion erosion, under the condition of two-phase flow, the part with larger turbulent flow intensity is used as the weak part except for judging the shearing force and is judged according to the turbulent flow intensity distribution, and under the condition of gas-liquid-solid three-phase flow, the part with more solid particle distribution is used as the weak part. Namely, a first analysis result is obtained by simulating and obtaining the corrosion and erosion influence of gas relative to a gas production wellhead by adopting finite element analysis.
As an example, when the influence of gas phase on the erosion of a gas production wellhead is obtained through finite element analysis as gas phase, the influence of the gas on the main drift diameter of a gas production tree, the turning area of the side drift diameter of the gas production tree and the flange connection area is large. That is, the possibility of erosion corrosion occurring in the gas production tree main drift diameter, the gas production tree side drift diameter turning region, and the flange connection region is relatively high, and therefore, a portion where the gas phase is relatively severe to the gas production tree erosion portion can be obtained as the first analysis result. Referring to fig. 7 and 8, fig. 7 is a weak point distribution of a cross gas production wellhead, and fig. 8 is a weak point distribution of a Y-type gas production wellhead. Wherein, the lower case English letters a, b, c, d, e, f, g, h, j, k, etc. points in fig. 7 and fig. 8 are the detection points of the weak position.
And 102, acquiring the erosion influence of the gas phase and the liquid phase on a gas production wellhead to obtain a second analysis result.
And simulating the erosion influence of gas-liquid phases on the gas production wellhead by adopting a finite element method to obtain a second analysis result.
As an example, when the influence of gas-liquid two-phase erosion on a gas production wellhead is obtained through finite element analysis to be gas-liquid two-phase, the influence of oil gas on the main drift diameter of a gas production tree, the turning area of the drift diameter on the side of the gas production tree and the flange connection area is large. That is, the possibility of erosion corrosion occurring in the main drift diameter of the gas production tree, the gas production tree side drift diameter turning region and the flange connection region is relatively high, and therefore, a region where gas-liquid two phases are relatively serious with respect to the gas production tree erosion portion can be obtained as a second analysis result.
And 103, acquiring the erosion influence of the gas-liquid-solid three phases on a gas production wellhead to obtain a third analysis result.
And simulating the erosion influence of gas-liquid phases on the gas production wellhead by adopting a finite element method to obtain a second analysis result.
As an example, when the influence of gas-liquid-solid three phases on the erosion of a gas production wellhead is obtained through finite element analysis, the influence of oil gas on the main drift diameter of a gas production tree, the turning area of the side drift diameter of the gas production tree and the flange connection area is large. That is, the possibility of erosion corrosion occurring in the main drift diameter of the gas production tree, the gas production tree side drift diameter turning region and the flange connection region is relatively high, and therefore, a region where gas-liquid-solid three phases are relatively serious to the gas production tree erosion portion can be obtained as a third analysis result.
And 104, determining a weak part of the gas production wellhead device according to the first analysis result, the second analysis result and the third analysis result.
In an alternative embodiment, step 104 includes: and taking the main drift diameter of the gas production tree, the side drift diameter turning area of the gas production tree and the flange connection area as weak parts.
In addition, by combining the actual operation and the first analysis result with the second analysis result and the third analysis result, it can be seen that the erosion and corrosion are most likely to occur in the gas production tree main diameter, the upper region near the gas production tree side diameter turning, and the lower flange region of the flange connection portion, that is, the gas production tree main diameter, the gas production tree side diameter turning region, and the flange connection region are weak portions.
And 105, determining a detection point according to the weak part of the gas production wellhead device.
And step 106, installing any one of the detection devices and the ultrasonic detector on the detection point for detection.
In an alternative embodiment, step 106 includes: the thickness of the weak parts of the plurality of gas production wellhead devices is obtained through any one of the detection devices.
And obtaining the average value of the thicknesses of the weak parts of the gas production wellhead devices according to the thicknesses of the weak parts of the gas production wellhead devices.
Because there will be measuring error in the measurement process, consequently can ask the average value of a plurality of weak position thickness of gas production wellhead assembly that obtain to regard average value as the testing result, with the accuracy that improves the testing result.
As an example, the obtained detection points of the main drift diameter of the christmas tree are shown in fig. 9, the point positions facing the front are points a, and the point positions are B, C, D points in order clockwise; the gas tree side drift diameter detection point position is shown in figure 10, the point position facing the sight line from top to bottom is point A, and the point positions are B, C, D points clockwise. I.e., A, B, C, D in fig. 3 and A, B, C, D in the figure are determined as detection points.
The detection device provided by the embodiment of the application is fixed at the detection point position according to the determined detection point position, so that the point position detected every time when the thickness of the gas production tree is measured at a single point is kept unchanged. The ultrasonic positioning device keeps the contact of the detection probe stable, so that the detection point of the weak part of the gas production tree is kept unchanged during each detection.
The embodiment of the application keeps the contact of the detection probe stable through the ultrasonic detector, so that the detection point of the weak part of the gas production tree is kept unchanged during each detection.
The method provided by the embodiment of the application clearly defines the detection position and the detection point position of the gas production wellhead device, improves the detection efficiency, and shortens the single detection time to be within 4 hours; the method provided by the embodiment of the invention can be used for tracking and detecting the fixed detection point for a long time, thereby improving the detection reliability of the erosion of the gas production wellhead device and ensuring the safety and controllability of the gas production wellhead device.
The above description is only an illustrative embodiment of the present invention, and should not be taken as limiting the scope of the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A gas production wellhead corrosion and erosion state detection device, characterized in that gas production wellhead corrosion and erosion state detection device includes: the device comprises a circumferential ring (1), a probe assembly (2) and an axial positioning piece (3);
one side edge of the probe assembly (2) is connected with the outer edge of the circumferential ring (1), and the other end of the probe assembly (2) is used for contacting with a piece to be detected (100);
one end of each axial positioning piece (3) is connected with the ring edge of the circumferential ring (1), and the other end of each axial positioning piece (3) is used for acquiring the axial distance between the axial positioning piece and the piece to be measured (100);
the circumferential ring (1) is used for being sleeved on the piece to be tested (100);
the probe assembly (2) comprises: the thickness measuring probe (21), the elastic component (22) and the end cover (23);
one side edge of the thickness measuring probe (21) is connected with the outer edge of the circumferential ring (1), and the other end of the thickness measuring probe is used for contacting with the piece to be measured (100);
the elastic part (22) is located above the thickness measuring probe (21), and the end cover (23) covers the elastic part (22).
2. A gas production wellhead corrosion and erosion status detection apparatus as claimed in claim 1 further comprising: the thickness measuring device comprises a connecting base (4), one end of the connecting base (4) is connected with the outer edge of the circumferential ring (1), and the other end of the connecting base is connected with one side edge of the thickness measuring probe (21).
3. A gas production wellhead corrosion and erosion status detection device according to claim 2, characterised in that the connection base (4) comprises: a first connection section (41), a second connection section (42), and a third connection section (43);
one end of the first connecting section (41) is connected with the second connecting section (42), the other end of the second connecting section (42) is connected with the third connecting section (43), a first accommodating space is formed between the first connecting section (41), the second connecting section (42) and the third connecting section (43), and the thickness measuring probe (21) is located in the first accommodating space.
4. A gas production wellhead corrosion and erosion status detection apparatus as claimed in claim 3 wherein the first (41), second (42) and third (43) connection sections are integrally stamped.
5. A gas production wellhead corrosion and erosion status detection apparatus as claimed in claim 3, further comprising: one end of the magnetic component (5) is connected with the connecting base (4), and the other end of the magnetic component is connected with the outer edge of the circumferential ring (1).
6. A gas production wellhead corrosion and erosion status detection apparatus according to claim 5, characterised in that the second connection section (42) has a second receiving space therein, the magnetic component (5) being located in the second receiving space.
7. A gas production wellhead corrosion and erosion status detection device according to claim 1, characterized by the circumferential ring (1) comprising: a first half ring (11), a second half ring (12) and a connecting piece (13);
the first half ring (11) and the second half ring (12) are connected through the connecting piece (13), and the first half ring (11) and the second half ring (12) are used for being sleeved on the to-be-tested piece (100).
8. A method of detecting the corrosion and erosion status of a gas production wellhead assembly, the method comprising:
obtaining the erosion influence of gas relative to a gas production wellhead to obtain a first analysis result;
acquiring the erosion influence of gas-liquid two phases on a gas production wellhead to obtain a second analysis result;
acquiring the erosion influence of gas-liquid-solid three phases on a gas production wellhead to obtain a third analysis result;
determining a weak part of the gas production wellhead device according to the first analysis result, the second analysis result and the third analysis result;
determining a detection point according to a weak part of the gas production wellhead device;
installing the detection device of any one of claims 1-7 and an ultrasonic detector on the detection point for detection.
9. The method of detecting a corrosion and erosion condition of a gas production wellhead as claimed in claim 8 wherein said determining a weak point of the gas production wellhead comprises:
and taking the main drift diameter of the gas production tree, the side drift diameter turning area of the gas production tree and the flange connection area as the weak parts.
10. The method for detecting the corrosion and erosion states of the gas production wellhead device according to claim 8, wherein the detection device according to any one of claims 1 to 7 and an ultrasonic detector are mounted on the detection point for detection, and the method comprises the following steps:
acquiring the thicknesses of weak parts of a plurality of gas production wellhead devices through the detection device of any one of claims 1-7;
obtaining an average value of the thicknesses of the weak parts of the gas production wellhead devices according to the thicknesses of the weak parts of the gas production wellhead devices;
and taking the average value as a detection result.
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