CN113310637A - Annular seal assembly abnormal working condition service simulation device and sealing performance detection method - Google Patents
Annular seal assembly abnormal working condition service simulation device and sealing performance detection method Download PDFInfo
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- CN113310637A CN113310637A CN202110571794.7A CN202110571794A CN113310637A CN 113310637 A CN113310637 A CN 113310637A CN 202110571794 A CN202110571794 A CN 202110571794A CN 113310637 A CN113310637 A CN 113310637A
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
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- G01M13/00—Testing of machine parts
Abstract
The invention discloses an abnormal working condition service simulation device and a sealing performance detection method for an annular sealing assembly, wherein the simulation device can simulate abnormal working condition environments of adverse factors such as non-centering of a casing hanger, deflection of a central line of the casing hanger, scratching of a sealing surface and the like so as to respectively simulate actual installation environments such as eccentricity of the casing hanger, drilling cuttings accumulation, scratching of the sealing surface and the like. The method for detecting the sealing performance of the annular sealing assembly in service under the abnormal working condition can be used for carrying out experimental research on the sealing effect of the annular sealing assembly under the simulated abnormal working condition environment, and by carrying out simulation tests, the research result can provide theoretical guidance for improving the field installation success rate and the sealing effect of the annular sealing assembly, thereby providing a basis for improving the operation efficiency and the economy of oil and gas field development.
Description
Technical Field
The invention relates to the technical field of oil and gas exploitation, in particular to an abnormal working condition service simulation device of an annular sealing assembly and a sealing performance detection method.
Background
The lower end of the high-pressure well head bears the weight of each layer of casing in an oil-gas well, and the upper end of the high-pressure well head provides support for key equipment such as an underwater production tree, an underwater blowout preventer group and the like, and is an irreplaceable important part in the whole marine oil drilling and production process. The annular sealing assembly is one of key components of the high-pressure wellhead head, provides pressure packing for annular spaces among all layers of casings in the high-pressure wellhead head, and the advantages and disadvantages of the sealing performance and the working reliability of the annular sealing assembly can influence the safety and reliability of underwater drilling, well completion and exploitation and even influence the success or failure of oil and gas drilling and exploitation.
As a part for sealing the annular space between the casing hanger and the high-pressure wellhead head, the annular sealing assembly is widely applied to the interior of the high-pressure wellhead head for ocean oil and gas exploitation. However, the casing hanger is not centered in the high-pressure wellhead head, the center line of the casing hanger deflects relative to the center line of the high-pressure wellhead head, and the annular seal assembly and the casing hanger/and the annular seal assembly and the sealing surface of the high-pressure wellhead head have scratches, which are three abnormal working conditions possibly occurring in the field operation process in the underwater well drilling and completion practice, and the three abnormal working conditions lead to the situation that the annular seal assembly is not installed in place on the field, reduce the installation success rate of the annular seal assembly, seriously affect the sealing effect, and further reduce the operation efficiency and the economy of oil and gas field development.
However, in the prior art for detecting the sealing effect of the annular sealing assembly, the normal service working condition state of the annular sealing assembly in the high-pressure well head is simulated, and the sealing effect of the annular sealing assembly, in which the casing hanger is not centered in the high-pressure well head, the center line of the casing hanger deflects relative to the center line of the high-pressure well head, and the sealing surface of the annular sealing assembly and the casing hanger or/and the annular sealing assembly and the high-pressure well head has scratches and the like, is not studied.
Disclosure of Invention
The invention aims to provide a service simulation device for abnormal working conditions of an annular sealing assembly and a sealing performance detection method, which are used for solving the problem that an experimental device which can simulate the service of the annular sealing assembly under the abnormal working conditions and can detect the sealing effect of the annular sealing assembly under the working conditions is lacked in the prior art.
The invention provides an abnormal working condition service simulation device for an annular sealing assembly, which comprises a high-pressure well head simulation cylinder, a casing hanger simulation piece, a base, a space adjusting control piece and a top locking ring, wherein the base and the top locking ring are respectively blocked at the bottom and the top of the high-pressure well head simulation cylinder; the casing hanger simulator, the top locking ring and the high-pressure well head simulator cylinder jointly enclose a reserved space of an annular sealing assembly; a space adjusting control piece is arranged on the wall of the high-pressure wellhead simulating cylinder corresponding to the lower cylindrical part of the casing hanger simulating piece; and the two sides of the high-pressure wellhead simulating cylinder are respectively provided with a left testing channel and a right testing channel, and the lowest points of the left testing channel and the right testing channel are respectively higher than or lower than the lowest point of the annular groove of the metal sealing ring.
Preferably, the space adjusting control element comprises an adjusting bolt, a flange sealing gasket and a flange plate, the adjusting bolt penetrates through the cylinder wall of the high-pressure well head simulating cylinder, the inner end of the adjusting bolt abuts against the casing hanger simulating element, the flange plate is arranged on the outer cylinder wall of the high-pressure well head simulating cylinder at the adjusting bolt, and the flange plate and the outer cylinder wall of the high-pressure well head simulating cylinder are sealed through the flange sealing gasket.
Preferably, a first bottom sealing ring and a second bottom sealing ring are arranged between the base and the bottom of the high-pressure wellhead simulating cylinder.
Preferably, a first top sealing ring and a second top sealing ring are arranged between the top locking ring and the top of the high-pressure well head simulation cylinder.
Preferably, the left test channel and the right test channel both include a vertical hole portion and a horizontal hole portion, the vertical hole portion vertically penetrates into the high-pressure wellhead simulating cylinder from the top to the bottom of the upper surface of the high-pressure wellhead simulating cylinder, the horizontal hole portion horizontally penetrates out of the lowest position of the vertical hole portion until communicating with the reserved space of the annular sealing assembly, and the horizontal hole portion of the left test channel is higher than the lowest point of the annular groove of the metal sealing ring and the horizontal hole portion of the right test channel is lower than the lowest point of the annular groove of the metal sealing ring.
The invention also relates to a method for detecting the sealing performance of the service of the annular sealing assembly under the abnormal working condition, which adopts the service simulation device for the abnormal working condition of the annular sealing assembly and comprises the following steps:
before the experiment begins, the adjusting bolt transversely pushes the casing hanger simulation piece to enable a transverse gap to be generated between the casing hanger simulation piece and the high-pressure wellhead simulation cylinder, and the annular seal assembly is simulated to be in service under the non-centered abnormal working condition;
when the sealing effect experiment of the annular sealing assembly is carried out, the experimental research is carried out on the sealing effect of the annular sealing assembly under the abnormal working condition of non-centering, and the abnormal working condition of a casing hanger simulation piece which is not centered in a high-pressure wellhead simulation cylinder can be simulated.
The invention also relates to a method for detecting the sealing performance of the service of the annular sealing assembly under the abnormal working condition, which adopts the service simulation device for the abnormal working condition of the annular sealing assembly and comprises the following steps:
before an experiment is started, arranging a cushion block between the casing hanger simulation piece and the base, enabling the central line of the casing hanger simulation piece to deflect relative to the central line of a high-pressure wellhead simulation cylinder, and simulating the service of an annular sealing assembly under the abnormal deflection working condition;
when the sealing effect experiment of the annular sealing assembly is carried out, the sealing effect of the annular sealing assembly is subjected to experimental research under the abnormal deflection working condition, and the abnormal deflection working condition of the central line of the casing hanger simulation part relative to the central line of the high-pressure wellhead simulation cylinder can be simulated.
The invention also relates to a method for detecting the sealing performance of the service of the abnormal working condition of the annular sealing assembly, which adopts the service simulation device of the abnormal working condition of the annular sealing assembly, wherein an external mating sealing surface is formed between the metal sealing ring and the simulation cylinder of the high-pressure wellhead head, and an internal mating sealing surface is formed between the metal sealing ring and the simulation piece of the casing hanger, and the method comprises the following steps:
step A: arranging a scratch on the outer mating sealing surface to form a first outer scratch; when the sealing effect experiment of the annular sealing assembly is carried out, the experimental study is carried out on the sealing effect of the annular sealing assembly under the abnormal working condition that a scratch exists on the outer paired sealing surface, and the adverse factor that the outer paired sealing surface is scratched to form a scratch in the installation process of the annular sealing assembly can be simulated;
and B: arranging a scratch on the inner matched sealing surface to form a first inner scratch; when the sealing effect experiment of the annular sealing assembly is carried out, the experimental study is carried out on the sealing effect of the annular sealing assembly under the abnormal working condition that a scratch exists on the inner paired sealing surfaces, and the adverse factor that the inner paired sealing surfaces are scratched to form a scratch in the installation process of the annular sealing assembly can be simulated;
and C: the outer matching sealing surface and the inner matching sealing surface are respectively provided with a scratch to respectively form a first outer scratch and a first inner scratch; when the sealing effect experiment of the annular sealing assembly is carried out, experimental research is carried out on the sealing effect of the annular sealing assembly under the abnormal working condition that a scratch is formed on the outer paired sealing surface and the inner paired sealing surface, and the adverse factors that the inner paired sealing surface and the outer paired sealing surface are scratched and a scratch is formed respectively in the installation process of the annular sealing assembly can be simulated;
step D: a plurality of scratches are arranged on the outer mating sealing surface and the inner mating sealing surface to form a plurality of outer scratches and a plurality of inner scratches respectively; when the sealing effect experiment of the annular sealing assembly is carried out, experimental research is carried out on the sealing effect of the annular sealing assembly under the abnormal working condition that a plurality of scratches exist on the outer paired sealing surface and the inner paired sealing surface, and adverse factors of the annular sealing assembly, which form the plurality of scratches respectively, can be simulated when the annular sealing assembly is scratched, and the outer paired sealing surface and the sealing surface are paired.
Specifically, many outer scratches include first outer scratch, second outer scratch, third outer scratch and fourth outer scratch, many interior scratches include first interior scratch, second interior scratch, third interior scratch and fourth interior scratch; the first outer scratch, the second outer scratch, the third outer scratch, the fourth outer scratch and the first inner scratch, the second inner scratch, the third inner scratch and the fourth inner scratch form four groups of scratch pairs respectively, wherein the first outer scratch and the first inner scratch form the first scratch pair, the second outer scratch and the second inner scratch form the second scratch pair, the third outer scratch and the third inner scratch form the third scratch pair, and the fourth outer scratch and the fourth inner scratch form the fourth scratch pair; first mar is to, second mar pair, third mar pair and fourth mar pair are four-point symmetric distribution at metal seal ring, and adjacent mar is to being separated by 90 between to.
Preferably, first outer mar with the outer mar of second is located on the inner wall of the oral analog section of thick bamboo of high-pressure well, the outer mar of third with the outer mar of fourth is located on the outer wall of metal seal ring, in first in the mar with in the third mar is located on the inner wall of metal seal ring, in the second in the mar with in the fourth mar is located on the outer wall of casing hanger analog piece.
Compared with the prior art, the invention has the beneficial effects that:
the invention discloses an abnormal working condition service simulation device and a sealing performance detection method for an annular sealing assembly, wherein the simulation device can simulate abnormal working condition environments of adverse factors such as non-centering of a casing hanger, deflection of a central line of the casing hanger, scratching of a sealing surface and the like so as to respectively simulate actual installation environments such as eccentricity of the casing hanger, accumulation of drill cuttings, scratching of the sealing surface and the like; the method for detecting the sealing performance can be used for carrying out experimental research on the sealing effect of the annular sealing assembly under the abnormal working condition environment, and by carrying out simulation tests, theoretical guidance can be provided for improving the field installation success rate and the sealing effect of the annular sealing assembly, so that a basis is provided for improving the installation operation efficiency and the economy of oil and gas field development.
Drawings
FIG. 1 is a schematic diagram of a prior art annular seal assembly;
fig. 2 is a schematic structural diagram of a simulation apparatus for an annular seal assembly to be used under an ideal working condition according to embodiment 1 of the present invention;
FIG. 3 is a schematic structural diagram of an abnormal operating condition of a casing hanger simulation piece not centered within a high pressure wellhead simulation cylinder as provided by embodiment 2 of the present invention;
fig. 4 is a schematic structural diagram of a simulation apparatus of the annular seal assembly provided in embodiment 2 of the present invention, which is in service under the abnormal operating condition of fig. 3;
FIG. 5 is a schematic structural diagram of a casing hanger simulator provided in embodiment 3 of the present invention, showing an abnormal condition in which the centerline of the casing hanger simulator deflects relative to the centerline of a high-pressure wellhead simulator casing;
FIG. 6 is a schematic structural diagram of a simulation apparatus for the annular seal assembly of FIG. 5 in service under the abnormal operating condition according to embodiment 3 of the present invention;
fig. 7 is a schematic structural diagram of an abnormal operating condition in which a scratch is formed on an outer mating sealing surface between a metal sealing ring and a high-pressure wellhead simulation cylinder according to embodiment 4 of the present invention;
FIG. 8 is a schematic structural diagram of an abnormal condition in which a scratch is formed on an inner mating sealing surface between a metal sealing ring and a casing hanger simulation piece according to embodiment 4 of the present invention;
fig. 9 is a schematic structural diagram of an abnormal operating condition in which both an inner mating seal surface between a metal seal ring and a casing hanger simulation piece and an outer mating seal surface between the metal seal ring and a high-pressure wellhead simulation cylinder provided in embodiment 4 of the present invention have a scratch;
fig. 10 is a schematic structural diagram of an abnormal operating condition in which both an inner mating seal surface between a metal seal ring and a casing hanger simulation piece and an outer mating seal surface between the metal seal ring and a high-pressure wellhead simulation cylinder provided in embodiment 4 of the present invention have multiple scratches.
Detailed Description
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Example 1
Example 1 provides a simulation apparatus for the service of an annular seal assembly under ideal operating conditions, the structure of which is described in detail below.
Referring to fig. 1, the annular seal assembly, as known in the art, includes a metal seal ring 41 and a seal lock ring 42, wherein, an annular groove 40 is arranged in the metal sealing ring 41, an annular flange is arranged on the sealing locking ring 42, and the size of the annular flange of seal lock ring 42 is slightly larger than the size of annular groove 40 of metal seal ring 41, when the metal sealing ring 41 and the sealing locking ring 42 are butted and then arranged in the high-pressure wellhead simulating cylinder, the annular flange of the sealing and locking ring 42 is in interference fit with the annular groove 40 of the metal sealing ring 41, the annular flange of the sealing and locking ring 42 extrudes the annular wall outside the metal sealing ring 41, the outer wall of the sealing and locking ring 42 is forced to extrude the inner wall of the high-pressure wellhead simulator barrel outwards and the inner wall inside the sealing and locking ring 42 inwards to extrude the outer wall of the upper end of the casing hanger simulator, thereby achieving the packing of the annular space between the high-pressure wellhead simulator cartridge 51 and each layer of casing.
The ideal working condition refers to the normal working condition of the abnormal working condition that the casing hanger simulation piece is not centered in the high-pressure wellhead simulation cylinder, the central line of the casing hanger simulation piece deflects relative to the central line of the high-pressure wellhead simulation cylinder, and the sealing surfaces of the annular sealing assembly and the casing hanger simulation piece or/and the annular sealing assembly and the high-pressure wellhead simulation cylinder are scratched.
Referring to fig. 2, the simulation apparatus includes a high-pressure wellhead simulator cylinder 51, a casing hanger simulator 21, a base 11, a space adjustment control member 3 and an upper lock ring 61,
the base 11 and the top locking ring 61 are respectively blocked at the bottom and the top of the high-pressure wellhead simulating cylinder 51, and the casing hanger simulating piece 21 is arranged on the base 11 and is positioned in the middle of the high-pressure wellhead simulating cylinder 51;
the upper part of the casing hanger simulation part 21, the top locking ring 61 and the high-pressure wellhead simulation cylinder 51 jointly enclose a reserved space of an annular sealing assembly, and the reserved space of the annular sealing assembly is used for arranging the annular sealing assembly;
the space adjustment control member 3 is provided on the wall of the high pressure wellhead simulation cartridge 51 corresponding to the lower cylindrical portion of the casing hanger simulation 21.
As a specific embodiment, the spatial adjustment control member 3 includes an adjusting bolt 31, a flange sealing gasket 32, and a flange 33, the adjusting bolt 31 penetrates through the wall of the high-pressure wellhead simulation cylinder 51, the inner end of the adjusting bolt 31 abuts against the casing hanger simulation member 21, the flange 33 is disposed on the outer wall of the high-pressure wellhead simulation cylinder 51 at the adjusting bolt 31, and the flange 33 and the outer wall of the high-pressure wellhead simulation cylinder 51 are sealed by the flange sealing gasket 32.
In order to realize the sealing effect between the base 11 and the bottom of the high-pressure wellhead simulation cylinder 51, a first bottom sealing ring 12 and a second bottom sealing ring 13 are arranged between the base 11 and the bottom of the high-pressure wellhead simulation cylinder 51.
In order to achieve a sealing effect of the top locking ring 61 with the top of the high pressure wellhead simulation cylinder 51, a first top sealing ring 62 and a second top sealing ring 63 are provided between the top locking ring 61 and the top of the high pressure wellhead simulation cylinder 51.
In order to detect the sealing effect of interference clamping between the annular flange of the sealing locking ring 42 and the annular groove 40 of the metal sealing ring 41, a left test channel 52 and a right test channel 53 are respectively arranged on two sides of the high-pressure wellhead simulation cylinder 51, so that pressure tests of pressure-bearing sealing effects can be performed in the upper and lower directions of the lowest point of the annular groove 40 of the metal sealing ring 41, and the lowest points of the left test channel 52 and the right test channel 53 are respectively higher or lower than the lowest point of the annular groove 40 of the metal sealing ring 41.
As a specific embodiment, each of the left testing channel 52 and the right testing channel 53 includes a vertical hole portion and a horizontal hole portion, the vertical hole portion vertically penetrates from the top to the bottom of the high-pressure wellhead simulating cylinder 51 to the inside of the high-pressure wellhead simulating cylinder 51, the horizontal hole portion horizontally penetrates from the lowest point of the vertical hole portion to communicate with the reserved space of the annular sealing assembly, and the horizontal hole portion of the left testing channel 52 is higher than the lowest point of the annular groove 40 of the metal sealing ring 41 and the horizontal hole portion of the right testing channel 53 is lower than the lowest point of the annular groove 40 of the metal sealing ring 41.
The flange 33 and the flange gasket 32 function to close the threaded passage of the adjuster bolt 31.
Specifically, the high pressure wellhead simulation cartridge 51 is threadably connected to the base 11 and the top locking ring 61.
The reserved space of the annular seal assembly between the high-pressure wellhead simulator cylinder 51 and the casing hanger simulator 21 is used for installing the underwater annular seal assembly and providing a matched seal surface, wherein an outer matched seal surface a is formed between the metal seal ring 41 and the high-pressure wellhead simulator cylinder 51, and an inner matched seal surface b is formed between the metal seal ring 41 and the casing hanger simulator 21.
The casing hanger simulator 21 is used to provide a mounting step face and mating seal face for the annular seal assembly.
The experimental method for the sealing effect of the annular sealing assembly of the simulation device for the annular sealing assembly to be in service under the ideal working condition comprises the following steps:
step S1: locking metal seal ring 41 in place using seal locking ring 42;
step S2: mounting a first top seal ring 62 and a second top seal ring 63 to the top lock ring 61, mounting the top lock ring 61 to the high-pressure wellhead section simulator cylinder 51 and screwing the connecting thread;
step S3: the left test channel 52 and the right test channel 53 are respectively used for carrying out pressure test of pressure-bearing sealing effect from the upper direction and the lower direction of the lowest point of the annular groove 40 of the metal sealing ring 41,
step S4: carrying out a sealing effect experiment on the annular sealing assembly;
step S5: after the experiment is finished, the top lock ring 61 and the underwater annular seal assembly are removed, and the adjusting bolt 31 and the casing hanger simulation piece 21 are reset.
The simulation device provided by the embodiment 1 is used for underwater drilling operation, can simulate the service condition of the annular sealing assembly under an ideal working condition, and can also carry out experimental research on the sealing effect of the annular sealing assembly under the ideal working condition.
Example 2
Embodiment 2 provides a method for detecting the service tightness of an annular seal assembly under an abnormal working condition, where the abnormal working condition is an abnormal working condition in which a casing hanger simulation piece is not centered in a high-pressure wellhead simulation cylinder, and the method includes the following steps:
the simulation that annular seal assembly was in service under the unusual operating mode of centering not: before the experiment begins, the adjusting bolt 31 transversely pushes the casing hanger simulation piece 21 to enable a transverse gap 100 to be generated between the casing hanger simulation piece 21 and the high-pressure wellhead simulation cylinder 51, the annular sealing assembly enters the non-centered abnormal working condition of the embodiment 2 from the service under the ideal working condition of the embodiment 1, and the annular sealing assembly is simulated to be in service under the non-centered abnormal working condition;
repeating steps S1 through S3;
carrying out the sealing effect experiment of the annular sealing assembly: when a sealing effect experiment of the annular sealing assembly is carried out, experimental research is carried out on the sealing effect of the annular sealing assembly under the non-centered abnormal working condition, the non-centered abnormal working condition of the casing hanger simulation piece 21 in the high-pressure wellhead simulation cylinder 51 can be simulated, as shown in fig. 3 and 4, so that the influence of the adverse factor of the non-centered casing hanger simulation piece 21 on the annular space between the annular sealing assembly isolation casing hanger simulation piece 21 and the high-pressure wellhead simulation cylinder 51 is detected;
step S5 is repeated.
Under the abnormal working condition of embodiment 2, analogue means not only can simulate annular seal assembly and serve at the abnormal working condition that casing hanger simulation piece 21 is not in the middle in high pressure wellhead simulation section of thick bamboo 51, can also carry out the pressure-bearing sealing experimental study to annular seal assembly's sealed effect under this abnormal working condition.
Example 3
Embodiment 2 provides a method for detecting the service tightness of a second annular sealing assembly under an abnormal working condition, wherein the abnormal working condition is an abnormal working condition that the central line of a casing hanger simulation piece deflects relative to the central line of a high-pressure wellhead simulation cylinder due to accumulation of drill cuttings, and the simulation device of embodiment 1 is adopted, and the method is basically the same as that of embodiment 2, except that the method comprises the following steps:
the simulation of the service of the annular seal assembly under the abnormal working condition of deflection: before the experiment begins, a cushion block 200 is arranged between a casing hanger simulation piece 21 and a base 11, so that a central line 300 of the casing hanger simulation piece deflects relative to a central line 400 of a high-pressure wellhead simulation cylinder, and the service of an annular sealing assembly under an abnormal working condition of deflection caused by accumulation of drilling cuttings is simulated;
carrying out the sealing effect experiment of the annular sealing assembly: when the sealing effect experiment of the annular sealing assembly is carried out, the sealing effect of the annular sealing assembly is experimentally researched under the abnormal deviation working condition, the abnormal working condition that the central line 300 of the casing hanger simulation piece deflects relative to the central line 400 of the high-pressure wellhead simulation cylinder can be simulated, and as shown in fig. 5 and 6, the influence of adverse factors for detecting the existence of the deflection angle of the central line 300 of the casing hanger simulation piece on the annular space between the annular sealing assembly isolation casing hanger simulation piece 21 and the high-pressure wellhead simulation cylinder 51 can be detected.
Wherein, the spacer 200 is arranged between the casing hanger simulator 21 and the base 11 and is used for simulating the adverse factors of deflecting the central line 300 of the casing hanger simulator relative to the central line 400 of the high-pressure wellhead simulating cylinder.
Under the abnormal working condition of embodiment 3, analogue means not only can simulate annular seal assembly and serve under the abnormal working condition that casing hanger simulation piece central line 300 deflects for high pressure well head simulation section of thick bamboo central line 400, can also carry out pressure-bearing sealing experimental study to annular seal assembly's sealed effect under this abnormal working condition.
Example 4
Embodiment 4 provides a method for detecting service tightness of a third annular seal assembly under an abnormal working condition, where the abnormal working condition is an abnormal working condition in which a seal surface of the annular seal assembly and a casing hanger simulation member or/and the annular seal assembly and a high-pressure wellhead simulation cylinder is scratched, and the simulation apparatus of embodiment 1 is used, the method including the steps of:
step A: before the experiment starts, a scratch is arranged on the outer mating sealing surface a between the metal sealing ring 41 and the high-pressure wellhead simulation cylinder 51 to form a first outer scratch a1, as shown in fig. 7; when the sealing effect experiment of the annular sealing assembly is carried out, the experimental study is carried out on the sealing effect of the annular sealing assembly under the abnormal working condition that a scratch exists on the outer paired sealing surface a, and the adverse factor that the scratch exists on the outer paired sealing surface a of the sealing surface in the installation process of the annular sealing assembly can be simulated;
and B: before the start of the experiment, a first inner score b1 was formed by providing a score on the inner mating sealing surface b between the metal seal ring 41 and the casing hanger dummy 21, as shown in fig. 8; when the sealing effect experiment of the annular sealing assembly is carried out, the experimental research on the sealing effect of the annular sealing assembly is carried out under the abnormal working condition that a scratch exists on the inner paired sealing surface b, and the adverse factor that the inner paired sealing surface b is scratched to form a scratch in the installation process of the annular sealing assembly can be simulated;
and C: before the experiment starts, a scratch is arranged on an outer mating sealing surface a between the metal sealing ring 41 and the high-pressure wellhead simulation cylinder 51 and an inner mating sealing surface b between the metal sealing ring 41 and the casing hanger simulation piece 21 to form a first outer scratch a1 and a first inner scratch b1 respectively, as shown in FIG. 9; when the sealing effect experiment of the annular sealing assembly is carried out, experimental research is carried out on the sealing effect of the annular sealing assembly under the abnormal working condition that a scratch is formed on the outer paired sealing surface a and the inner paired sealing surface b, and the adverse factor that the annular sealing assembly scratches the inner paired sealing surface b and the outer paired sealing surface a and forms a scratch respectively in the installation process can be simulated;
step D: before the experiment starts, a plurality of scratches are arranged on an outer mating sealing surface a between the metal sealing ring 41 and the high-pressure wellhead simulation cylinder 51 and an inner mating sealing surface b between the metal sealing ring 41 and the casing hanger simulation piece 21 to form a plurality of outer scratches and a plurality of inner scratches respectively, as shown in fig. 10; when the sealing effect experiment of the annular sealing assembly is carried out, experimental research is carried out on the sealing effect of the annular sealing assembly under the abnormal working condition that a plurality of scratches exist on the outer paired sealing surface a and the inner paired sealing surface b, and the adverse factors that the annular sealing assembly scratches the inner paired sealing surface b and the outer paired sealing surface a in the installation process and respectively form a plurality of scratches can be simulated.
Wherein, many outer scratch include first outer scratch a1, the outer scratch a2 of second, the outer scratch a3 of third and fourth outer scratch a4, and many interior scratches include first interior scratch b1, second interior scratch b2, third interior scratch b3 and fourth interior scratch b 4.
Preferably, the first outer scratch a1, the second outer scratch a2, the third outer scratch a3, the fourth outer scratch a4, the first inner scratch b1, the second inner scratch b2, the third inner scratch b3, and the fourth inner scratch b4 form four scratch pairs, respectively, wherein the first outer scratch a1 and the first inner scratch b1 form a first scratch pair, the second outer scratch a2 and the second inner scratch b2 form a second scratch pair, the third outer scratch a3 and the third inner scratch b3 form a third scratch pair, and the fourth outer scratch a4 and the fourth inner scratch b4 form a fourth scratch pair.
Wherein, first mar pair, second mar pair, third mar pair and fourth mar pair are four-point symmetric distribution at metal seal ring 41, and 90 are separated between adjacent mar pair. The first and third scratch pairs are spaced 180 apart and the second and fourth scratch pairs are spaced 180 apart.
Specifically, the first outer scratch a1 and the second outer scratch a2 are located on the inner wall of the high-pressure wellhead simulator cartridge 51, the third outer scratch a3 and the fourth outer scratch a4 are located on the outer wall of the metal seal ring 41, the first inner scratch b1 and the third inner scratch b3 are located on the inner wall of the metal seal ring 41, and the second inner scratch b2 and the fourth inner scratch b4 are located on the outer wall of the casing hanger simulator 21.
And (3) carrying out pressure test of pressure-bearing sealing effect from the upper direction and the lower direction of the lowest point of the annular groove 40 of the metal sealing ring 41 by utilizing the left testing channel 52 and the right testing channel 53 respectively so as to check the influence of adverse factors of scratching a sealing surface in the installation process on an annular space between the annular sealing assembly isolation sleeve hanger simulation piece 21 and the high-pressure wellhead simulation cylinder 51.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. An abnormal working condition service simulation device of an annular seal assembly is characterized by comprising a high-pressure wellhead simulation cylinder (51), a casing hanger simulation piece (21), a base (11), a space adjusting control piece (3) and a top locking ring (61),
the base (11) and the top locking ring (61) are respectively plugged at the bottom and the top of the high-pressure well head simulation cylinder (51), and the casing hanger simulation piece (21) is arranged on the base (11) and is positioned in the middle of the high-pressure well head simulation cylinder (51);
the casing hanger simulator (21), the top locking ring (61) and the high-pressure well head simulator cylinder (51) jointly form a reserved space of an annular sealing assembly;
a space adjusting control piece (3) is arranged on the wall of the high-pressure wellhead simulation cylinder (51) corresponding to the lower cylindrical part of the casing hanger simulation piece (21);
and a left test channel (52) and a right test channel (53) are respectively arranged on two sides of the high-pressure wellhead simulating cylinder (51), and the lowest points of the left test channel (52) and the right test channel (53) are respectively higher or lower than the lowest point of the annular groove (40) of the metal sealing ring (41).
2. The service simulator for abnormal operating conditions of annular seal assemblies according to claim 1,
the space adjusting control part (3) comprises an adjusting bolt (31), a flange sealing gasket (32) and a flange plate (33),
the adjusting bolt (31) penetrates through the wall of the high-pressure well head simulating cylinder (51), the inner end of the adjusting bolt (31) abuts against the casing hanger simulating piece (21), the flange plate (33) is arranged on the outer wall of the high-pressure well head simulating cylinder (51) at the adjusting bolt (31), and the flange plate (33) and the outer wall of the high-pressure well head simulating cylinder (51) are sealed through the flange sealing gasket (32).
3. The service simulator for abnormal operating conditions of annular seal assemblies according to claim 1,
a first bottom sealing ring (12) and a second bottom sealing ring (13) are arranged between the base (11) and the bottom of the high-pressure wellhead simulation cylinder (51).
4. The service simulator for abnormal operating conditions of annular seal assemblies according to claim 1,
and a first top sealing ring (62) and a second top sealing ring (63) are arranged between the top locking ring (61) and the top of the high-pressure wellhead simulating cylinder (51).
5. The service simulator for abnormal operating conditions of annular seal assemblies according to claim 1,
the left testing channel (52) and the right testing channel (53) respectively comprise a vertical hole portion and a horizontal hole portion, the vertical hole portion vertically penetrates into the high-pressure wellhead simulation cylinder (51) from the top to the bottom of the upper surface of the high-pressure wellhead simulation cylinder (51), the horizontal hole portion horizontally penetrates out of the lowest position of the vertical hole portion until the horizontal hole portion is communicated with a reserved space of the annular sealing assembly, the horizontal hole portion of the left testing channel (52) is higher than the lowest point of an annular groove (40) of the metal sealing ring (41), and the horizontal hole portion of the right testing channel (53) is lower than the lowest point of the annular groove (40) of the metal sealing ring (41).
6. A method for detecting the sealing performance of an annular sealing assembly in service under abnormal working conditions, which adopts the device for simulating the service of the annular sealing assembly under abnormal working conditions as claimed in any one of claims 1 to 5, and comprises the following steps:
before the experiment begins, the adjusting bolt (31) transversely pushes the casing hanger simulation piece (21), so that a transverse gap (100) is generated between the casing hanger simulation piece (21) and the high-pressure wellhead simulation cylinder (51), and the simulated annular sealing assembly is in service under the non-centered abnormal working condition;
when the sealing effect experiment of the annular sealing assembly is carried out, the sealing effect of the annular sealing assembly is subjected to experimental research under the abnormal working condition of non-centering, and the abnormal working condition of a casing hanger simulation piece (21) which is not centered in a high-pressure wellhead simulation cylinder (51) can be simulated.
7. A method for detecting the sealing performance of an annular sealing assembly in service under abnormal working conditions, which adopts the device for simulating the service of the annular sealing assembly under abnormal working conditions as claimed in any one of claims 1 to 5, and comprises the following steps:
before an experiment is started, arranging a cushion block (200) between the casing hanger simulation piece (21) and the base (11) to enable a central line (300) of the casing hanger simulation piece to deflect relative to a central line (400) of a high-pressure wellhead simulation cylinder, and simulating the service of the annular sealing assembly under the abnormal deflection working condition;
when the sealing effect experiment of the annular sealing assembly is carried out, the sealing effect of the annular sealing assembly is experimentally researched under the abnormal deflection working condition, and the abnormal deflection working condition of the central line (300) of the casing hanger simulation part relative to the central line (400) of the high-pressure wellhead simulation cylinder can be simulated.
8. A method for detecting the sealing performance of an annular sealing assembly in service under abnormal working conditions by using the device for simulating the service under abnormal working conditions of the annular sealing assembly as claimed in any one of claims 1 to 5, wherein an outer mating sealing surface (a) is formed between the metal sealing ring (41) and the high-pressure wellhead simulation cylinder (51), and an inner mating sealing surface (b) is formed between the metal sealing ring (41) and the casing hanger simulation piece (21), and the method comprises the following steps:
step A: providing a score line on the outer mating seal surface (a) to form a first outer score line (a 1); when the sealing effect experiment of the annular sealing assembly is carried out, the experimental research on the sealing effect of the annular sealing assembly is carried out under the abnormal working condition that a scratch exists on the outer paired sealing surface (a), and the adverse factor that the outer paired sealing surface (a) is scratched to form a scratch in the installation process of the annular sealing assembly can be simulated;
and B: providing a score line on the inner mating seal surface (b) to form a first inner score line (b 1); when the sealing effect experiment of the annular sealing assembly is carried out, the experimental research on the sealing effect of the annular sealing assembly is carried out under the abnormal working condition that a scratch is formed on the inner paired sealing surface (b), and the adverse factor that the inner paired sealing surface (b) is scratched to form a scratch in the installation process of the annular sealing assembly can be simulated;
and C: providing a scratch mark on the outer mating sealing surface (a) and the inner mating sealing surface (b) to form a first outer scratch mark (a1) and a first inner scratch mark (b1), respectively; when a sealing effect experiment of the annular sealing assembly is carried out, experimental research is carried out on the sealing effect of the annular sealing assembly under the abnormal working condition that a scratch is formed on the outer paired sealing surface (a) and the inner paired sealing surface (b), and the adverse factors that the inner paired sealing surface (b) and the outer paired sealing surface (a) are scratched and a scratch is formed in the installation process of the annular sealing assembly can be simulated;
step D: a plurality of scratches are arranged on the outer mating sealing surface (a) and the inner mating sealing surface (b) to form a plurality of outer scratches and a plurality of inner scratches respectively; when the sealing effect experiment of the annular sealing assembly is carried out, experimental research is carried out on the sealing effect of the annular sealing assembly under the abnormal working condition that a plurality of scratches exist on the outer paired sealing surface (a) and the inner paired sealing surface (b), and the adverse factors that the annular sealing assembly scratches the inner paired sealing surface (b) and the outer paired sealing surface (a) in the installation process and respectively form a plurality of scratches can be simulated.
9. The method for detecting the sealing performance of the annular sealing assembly in service under the abnormal working condition of the claim 8, wherein the plurality of outer scratches comprise a first outer scratch (a1), a second outer scratch (a2), a third outer scratch (a3) and a fourth outer scratch (a4), and the plurality of inner scratches comprise a first inner scratch (b1), a second inner scratch (b2), a third inner scratch (b3) and a fourth inner scratch (b 4);
the first outer scratch mark (a1), the second outer scratch mark (a2), the third outer scratch mark (a3) and the fourth outer scratch mark (a4) and the first inner scratch mark (b1), the second inner scratch mark (b2), the third inner scratch mark (b3) and the fourth inner scratch mark (b4) form four groups of scratch mark pairs respectively, wherein the first outer scratch mark (a1) and the first inner scratch mark (b1) form the first scratch mark pair, the second outer scratch mark (a2) and the second inner scratch mark (b2) form the second scratch mark pair, the third outer scratch mark (a3) and the third inner scratch mark (b3) form the third scratch mark pair, and the fourth outer scratch mark (a4) and the fourth inner scratch mark (b4) form the fourth scratch mark pair;
the first scratch pair, the second scratch pair, the third scratch pair and the fourth scratch pair are symmetrically distributed at four points on the metal sealing ring (41), and the adjacent scratch pairs are separated by 90 degrees.
10. The method for detecting the sealing performance of the annular seal assembly in service under the abnormal working condition as claimed in claim 8, wherein the first outer scratch (a1) and the second outer scratch (a2) are located on the inner wall of the high-pressure wellhead simulation cylinder (51), the third outer scratch (a3) and the fourth outer scratch (a4) are located on the outer wall of the metal seal ring (41), the first inner scratch (b1) and the third inner scratch (b3) are located on the inner wall of the metal seal ring (41), and the second inner scratch (b2) and the fourth inner scratch (b4) are located on the outer wall of the casing hanger simulation piece (21).
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| CN112377138A (en) * | 2020-11-12 | 2021-02-19 | 中国石油大学(华东) | Sealing assembly for underwater wellhead |
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| CN101769146A (en) * | 2009-12-30 | 2010-07-07 | 中国石油天然气集团公司 | Metal-to-metal sealing tieback connector |
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