CN112647929B - Experimental device for be used for detecting pit shaft deposit - Google Patents
Experimental device for be used for detecting pit shaft deposit Download PDFInfo
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- CN112647929B CN112647929B CN201910964526.4A CN201910964526A CN112647929B CN 112647929 B CN112647929 B CN 112647929B CN 201910964526 A CN201910964526 A CN 201910964526A CN 112647929 B CN112647929 B CN 112647929B
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- 239000012530 fluid Substances 0.000 claims abstract description 48
- 238000007789 sealing Methods 0.000 claims description 40
- 238000012360 testing method Methods 0.000 claims description 23
- 230000007246 mechanism Effects 0.000 claims description 19
- 238000005259 measurement Methods 0.000 claims description 10
- 238000004891 communication Methods 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 3
- 230000008021 deposition Effects 0.000 abstract description 16
- 239000010720 hydraulic oil Substances 0.000 description 9
- 239000003921 oil Substances 0.000 description 7
- 238000005086 pumping Methods 0.000 description 5
- 238000000429 assembly Methods 0.000 description 4
- 230000000712 assembly Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229920005372 Plexiglas® Polymers 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000011895 specific detection Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Geophysics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The invention relates to an experimental device for detecting wellbore deposits, comprising a wellbore assembly, the wellbore assembly comprising a wide diameter wellbore piece and a narrow diameter wellbore piece, the inside diameter of the narrow diameter wellbore piece being smaller than the inside diameter of the wide diameter wellbore piece, the first end of the wide diameter wellbore piece and the first end of the narrow diameter wellbore piece being butted together in an axial direction, a reducing section being formed inside the junction between the wide diameter wellbore piece and the narrow diameter wellbore piece, wherein experimental fluid is able to flow into the wellbore assembly in the axial direction and through the reducing section. The experimental device can be used for detecting the deposition condition of the variable diameter part of the shaft.
Description
Technical Field
The invention relates to the technical field of underground safety guarantee, in particular to an experimental device for measuring well bore deposition.
Background
At present, a series of researches are carried out at home and abroad on the phase change occurring in the multiphase flow of the shaft under different working conditions. For example, when a fluid flows in a well, there is a possibility that a specific phase change occurs due to various reasons such as temperature, pressure, etc., for example, precipitation of waxy crystals and formation of hydrate particles. These changes tend to cause the fluid to become viscous, thereby tending to cause deposits and even blockages in the wellbore.
So far, these studies have been mainly performed for conventional diameter segments. In practice, however, the tubing used in the drilling process is not of equal diameter, but is formed by interconnecting different sized wellbores. A change in the inner diameter will occur at the junction between different sized wellbores, referred to herein as a "reducing section. The deposition of waxy crystals or hydrate particles etc. as described above is more likely to occur at such junctions. These deposits can affect the ability of the fluid in the wellbore to flow, making the wellbore susceptible to plugging, impeding normal production operations, and even causing serious accidents and losses.
It is therefore desirable to provide an experimental apparatus that can detect the deposition of a variable diameter portion of a wellbore.
Disclosure of Invention
In view of the above, the present invention provides an experimental apparatus that can be used to detect the deposition of a variable diameter portion of a wellbore.
According to the invention an experimental device for detecting wellbore deposits is proposed, comprising a wellbore assembly comprising a wide diameter wellbore piece and a narrow diameter wellbore piece, the inner diameter of the narrow diameter wellbore piece being smaller than the inner diameter of the wide diameter wellbore piece, the first end of the wide diameter wellbore piece and the first end of the narrow diameter wellbore piece being butted together in an axial direction, a reducing section being formed inside the junction between the wide diameter wellbore piece and the narrow diameter wellbore piece, wherein experimental fluid is able to flow into the wellbore assembly in the axial direction and through the reducing section.
By flowing the test fluid in an axial direction through the variable diameter portion of the wellbore assembly, the flow of fluid through the variable diameter portion of the wellbore during actual downhole operations can be simulated. While flowing, or after flowing, the test fluid, the user may detect and/or observe the wellbore assembly to determine deposition within the wellbore assembly, particularly at the variable diameter portion. Based on the detected results, the actual flow of fluid in the wellbore during downhole operations can be effectively predicted and corresponding measures can be taken to avoid blockages in the actual wellbore, particularly at the variable diameter portion.
In one embodiment, the wide diameter wellbore piece and the narrow diameter wellbore piece are configured to be removable and installable with respect to each other.
In one embodiment, the wide diameter wellbore member is movable in an axial direction proximate the narrow diameter wellbore member and/or the narrow diameter wellbore member is movable in an axial direction proximate the wide diameter wellbore member such that a first end of the narrow diameter wellbore member is insertable into a first end of the wide diameter wellbore member.
In one embodiment, a seal cover plate extending perpendicular to the axial direction of the wide diameter wellbore member and the narrow diameter wellbore member is disposed between the wide diameter wellbore member and the narrow diameter wellbore member, the seal cover plate being configured to sealingly engage the first end of the wide diameter wellbore member and the first end of the narrow diameter wellbore member to effect a seal between the wide diameter wellbore member and the narrow diameter wellbore member.
In one embodiment, a sealing groove is configured on an outer sidewall of the first end of the narrow bore, and the sealing cover plate is configured to be inserted into the sealing groove to seal with the narrow bore.
In one embodiment, the first end of the sealing cover plate is configured to seal against the narrow-diameter well bore member, the second end of the sealing cover plate is telescopically inserted into a cover plate guide slot, the cover plate guide slot is in communication with a sealing hydraulic passage, the sealing cover plate moves toward the narrow-diameter well bore member until the first end of the sealing cover plate seals against the narrow-diameter well bore member when fluid is introduced into the cover plate guide slot through the sealing hydraulic passage, and the sealing cover plate moves away from the narrow-diameter well bore member when fluid is pumped from the cover plate guide slot through the sealing hydraulic passage.
In one embodiment, the experimental apparatus includes a plurality of the narrow diameter wellbore pieces and a plurality of the wide diameter wellbore pieces, the plurality of narrow diameter wellbore pieces being annularly radially arranged in a first longitudinal plane, the plurality of wide diameter wellbore pieces being annularly radially arranged around the plurality of narrow diameter wellbore pieces in the first longitudinal plane such that the orientations of the respective wide diameter wellbore pieces are different from each other, the orientations of the respective narrow diameter wellbore pieces being different from each other, the first ends of the respective narrow diameter wellbore pieces being insertable into the first ends of the wide diameter wellbore pieces opposite thereto to form the variable diameter portion.
In one embodiment, at least two of the plurality of wide diameter wellbore pieces have different inner diameters relative to one another, and/or at least two of the plurality of narrow diameter wellbore pieces have different inner diameters relative to one another.
In one embodiment, the plurality of narrow diameter wellbore pieces and/or the plurality of wide diameter wellbore pieces are configured to be rotatable about a center of an annulus disposed.
In one embodiment, the experimental set-up further comprises: a first measurement mechanism mounted on a sidewall of the wide diameter wellbore piece and/or the first end of the narrow diameter wellbore piece, the first measurement mechanism configured to measure at least one of temperature, pressure, acoustic impedance, and electrical impedance at the first end of the wide diameter wellbore piece and/or the narrow diameter wellbore piece; and a second measurement mechanism mounted on a bottom wall of the second end of the wide diameter wellbore piece and/or the narrow diameter wellbore piece, the second measurement mechanism configured to measure at least one of temperature, pressure, acoustic impedance, and electrical impedance at the second end of the wide diameter wellbore piece and/or the narrow diameter wellbore piece.
Compared with the prior art, the invention has the advantages that: by flowing the test fluid in an axial direction through the variable diameter portion of the wellbore assembly, the flow of fluid through the variable diameter portion of the wellbore during actual downhole operations can be simulated. While flowing, or after flowing, the test fluid, the user may detect and/or observe the wellbore assembly to determine deposition within the wellbore assembly, particularly at the variable diameter portion. Based on the detected results, the actual flow of fluid in the wellbore during downhole operations can be effectively predicted and corresponding measures can be taken to avoid blockages in the actual wellbore, particularly at the variable diameter portion. The annular arrangement and rotation of the plurality of wide diameter wellbore pieces and the plurality of narrow diameter wellbore pieces may allow for different wide diameter wellbore pieces to be mated with different narrow diameter wellbore pieces, thereby allowing for testing of a wide variety of wellbores. In addition, this arrangement also facilitates testing of wellbore assemblies at different well angles. Furthermore, this arrangement is advantageous in saving experimental space.
Drawings
The invention is described in more detail hereinafter with reference to the accompanying drawings. Wherein:
FIG. 1 shows a schematic diagram of an experimental apparatus for detecting wellbore deposits according to one embodiment of the invention;
FIG. 2 shows a schematic view of the experimental setup for detecting wellbore deposits of FIG. 1 at another angle;
FIG. 3 shows a schematic diagram of an experimental apparatus for detecting wellbore deposits according to one embodiment of the invention; and is also provided with
Fig. 4 shows a schematic diagram of an experimental apparatus for detecting wellbore deposits according to another embodiment of the invention.
In the drawings, like parts are designated with like reference numerals. The figures are not drawn to scale.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
As shown in fig. 1 to 3, an experimental apparatus 100 for detecting wellbore deposition according to the present invention includes a wellbore assembly including a wide-diameter wellbore section 5 and a narrow-diameter wellbore section 3, the narrow-diameter wellbore section 3 having an inner diameter smaller than that of the wide-diameter wellbore section.
In one embodiment, the wide diameter wellbore member 5 and the narrow diameter wellbore member 3 may be integrally formed such that the first end of the wide diameter wellbore member 5 and the first end of the narrow diameter wellbore member 3 are directly connected to each other, forming a variable diameter portion inside the junction therebetween.
In a preferred embodiment, the wide diameter wellbore section 5 and the narrow diameter wellbore section 3 are independent of each other, and are detachable and installable with respect to each other. When the first end of the wide diameter wellbore member 5 and the first end of the narrow diameter wellbore member 3 are connected to each other with the first ends thereof facing each other, a reduced diameter portion is formed inside the junction between the wide diameter wellbore member 5 and the narrow diameter wellbore member 3.
The experimental device 100 may also include a first fluid passageway 10 in communication with the second end of the wide diameter wellbore element 5 and a second fluid passageway 2 in communication with the second end of the narrow diameter wellbore element 3.
The first fluid passage 10 communicates with, for example, a pumping mechanism 16. The second fluid channel 2 is for example in communication with an experimental fluid recovery vessel 15. Thus, the pumping mechanism 16 may pump the test fluid (e.g., mud) through the first fluid passage 10, the wide diameter wellbore member 5, the narrow diameter wellbore member 3, the second fluid passage 2, and ultimately into the test fluid recovery vessel 15. Thus, the flow of fluid from a wide diameter wellbore to a narrow diameter wellbore (e.g., in direction 501 in FIG. 3) may be simulated.
Alternatively or additionally, the experimental fluid may also be flowed from the second fluid channel 2 through the narrow diameter wellbore section 3, the wide diameter wellbore section 5 and the first fluid channel 10. Thus, it is possible to simulate the flow of fluid from a narrow wellbore to a wide wellbore.
The user may observe or detect the wellbore assembly during or after the flow of the test fluid to determine the deposition and plugging of the wellbore assembly, particularly the variable diameter portion.
In the embodiment shown in fig. 1, a plurality of wide diameter wellbore pieces 5 and a corresponding number of narrow diameter wellbore pieces 3 are provided. A plurality of wide diameter wellbore pieces 5 are arranged in an annular radial pattern in a first longitudinal plane, with their first ends all disposed toward the center of the annulus. Similarly, a plurality of narrow bore members 3 are arranged in an annular radial pattern in the first longitudinal plane, with their second ends all disposed toward the center of the annulus. That is, the first ends of the plurality of narrow bore members 3 are disposed away from the center of the annulus. The plurality of narrow bore elements 3 are surrounded by the plurality of wide bore elements 5 such that a first end of each narrow bore element 3 can be opposed to a first end of a corresponding wide bore element 5.
In this case, the well bore assembly formed by the pair of the wide diameter well bore member 5 and the narrow diameter well bore member 3 may be inspected, or a plurality of well bore assemblies may be inspected at the same time. The orientation of each wellbore assembly in the first longitudinal plane is different, whereby wellbore assemblies at different well angles can be simulated and inspected.
In addition, in this case, the space required for the experimental apparatus 100 can be effectively saved, and particularly, the area required for the experiment can be effectively saved. This can greatly reduce the requirements and restrictions of the experimental apparatus 100 on the experimental field, and effectively improve the adaptability of the experimental apparatus 100.
With the above arrangement shown in fig. 1, if a flow of experimental fluid from the wide diameter wellbore piece 5 to the narrow diameter wellbore piece 3 is to be achieved, the following arrangement may be made.
The first fluid passage 10 may comprise an annular, first main passage surrounding a plurality of wide diameter wellbore pieces 5, the first main passage being in communication with a pumping mechanism 16. The first fluid passage 10 further comprises a plurality of first bypass passages, each of which has one end in communication with the first main passage and the other end in communication with the second end of the wide diameter wellbore member 5. A respective pressure control diverter 11 is provided on each first bypass channel for the respective wide-diameter shaft element 5, and a valve 9 is provided downstream of the pressure control diverter 11. The pressure control shunt 11 may be, for example, a constant pressure constant speed pump.
It will be appreciated that if it is desired to have experimental fluid flowing from the narrow bore section 3 to the wide bore section 5, a corresponding pressure control diverter and valve may be provided on the second fluid passage 2 communicating to the second end of the narrow bore section 3.
In addition, with the arrangement described above as shown in fig. 1, the experimental device 100 may also include a bracket assembly 13, the bracket assembly 13 including a hollow first leg 132 (fig. 2). The first leg 132 serves as a support structure, one end of which may be supported, for example, on the ground or any base for mounting the experimental device 100, and the other end of which extends to the center of the annular shape in which the narrow bore component 3 is arranged. Additional support structures may be provided between the other end of the first leg 132 and the narrow bore member 3. The first leg 132 may be provided as part of the second fluid passage 2. Other parts of the second fluid channel 2 may for example comprise hoses or other pipe structures. Thus, the test fluid may flow from the narrow bore component 3 through the passage in the first leg 132 to the test fluid recovery vessel 15, or from another pumping mechanism through the second passage in the first leg 132 to the narrow bore component 3. This provision of the first leg 132 for both support and as part of the channel is advantageous in saving space occupied by the entire experimental set-up 100 and in ensuring a reasonable and unobstructed fluid flow path.
In addition, the wide diameter wellbore piece 5 and the narrow diameter wellbore piece 3 can be moved relative to each other to achieve the interface therebetween. In the embodiment shown in fig. 1 and 3, the narrow bore section 3 is movable by the hydraulic machine 1 in the insertion direction 101 towards the wide bore section 5 such that the narrow bore section 3 interfaces with the wide bore section 5. The experimental set-up 100 may further comprise a driving oil pump 14, which driving oil pump 14 communicates with the above-mentioned hydraulic machine 1 via a first hydraulic oil channel. The driving oil pump 14 may pump hydraulic oil into the hydraulic mechanism 1 to push the narrow-diameter wellbore piece 3 toward the wide-diameter wellbore piece 5, or may suck hydraulic oil from the hydraulic mechanism 1 to enable the narrow-diameter wellbore piece 3 to move away from the wide-diameter wellbore piece 5. The hydraulic mechanism 1 may be a hydraulic cylinder, a hydraulic telescopic column, or the like. Alternatively or additionally, the wide diameter wellbore member 5 may be movable toward the narrow diameter wellbore member 3.
As shown in fig. 2, the bracket assembly 13 of the experimental device 100 further includes a hollow second leg 131. The second leg 131 serves as a support structure, which may be supported at one end on the ground or any base for mounting the experimental device 100, for example, and at the other end extends to the centre of the annular shape in which the narrow bore component 3 is arranged. Additional support structures may be provided between the other end of the second leg 131 and the narrow bore member 3. The second leg 131 may be part of the first hydraulic oil passage. Other portions of the first hydraulic oil passage may include, for example, hoses or other conduit structures. Thereby, the hydraulic oil can flow between the hydraulic machine 1 and the driving oil pump 14 through the second leg 131. This provision of the second leg 131 for both support and as part of the channel is advantageous for saving space occupied by the whole experimental set-up 100 and for ensuring a reasonable and unobstructed hydraulic oil flow path.
In the embodiment shown in fig. 2, the bracket assembly includes the first leg 132 and the second leg 131 described above. They each extend obliquely and oppositely with respect to the wide diameter wellbore piece 5 and the narrow diameter wellbore piece 3 in a second longitudinal plane perpendicular to the first longitudinal plane. The upper end (i.e., the other end) of the first leg 132 and the upper end (i.e., the other end) of the second leg 131 can intersect and be connected at the center of the ring-shaped arrangement, thereby securing the stability of the structure of the experimental device 100. Other support structures may be provided for the experimental set-up 100 as desired.
In addition, the experimental device 100 of the invention is preferably provided with a swivel bearing 12 at the center of the annular arrangement (i.e. at the intersection of the upper ends of the first leg 132 and the second leg 131 of the support assembly 13). The rotor of the swivel bearing 12 is connected to the narrow bore element 3 and the stator of the swivel bearing 12 is connected to the support assembly 13, thereby allowing the narrow bore element 3 to rotate in a first longitudinal plane about the centre of the annular arrangement in relation to the support assembly 13. With this arrangement, the swivel bearing allows rotation of the narrow bore component 3 relative to the carrier assembly 13.
In one instance, the narrow diameter wellbore section 3 is rotatable while the wide diameter wellbore section 5 is non-rotatable. At this point, the narrow bore members 3 may be rotated relative to the wide bore members 5, allowing each narrow bore member 3 to oppose and engage a different wide bore member 5 to form a bore assembly. Here, the inner diameters of the individual narrow bore assemblies 3 may be made different, or at least the inner diameters of two of the narrow bore members 3 may be made different. Alternatively or additionally, the inner diameters of the individual wide diameter wellbore pieces 5 may be made different, or at least the inner diameters of two of the wide diameter wellbore pieces 5 may be made different. Thus, it is possible to measure the detection of different sizes of wellbore components in certain determined angles of inclination. For example, as shown in fig. 1, 8 wide diameter wellbore pieces 5 and 8 narrow diameter wellbore pieces 3 are provided. The 8 wide diameter wellbore pieces 5 are evenly arranged in an annular shape, whereby 8 determined well inclination angles can be obtained. These 8 inclination angles cover substantially the vast majority of cases in an actual wellbore arrangement. Therefore, the experimental device 100 can basically meet the requirements of common detection experiments, has lower cost and better economic benefit.
In another case, while the narrow bore members 3 are rotatable, the wide bore members 5 may also be rotated independently of the narrow bore members 3 so that each wide bore member 5 may be mated with a corresponding narrow bore member 3 at a more freely selected angle. Here, the individual wide-diameter shaft elements 5 and the individual narrow-diameter shaft elements 3 can also have different dimensions. Thus, not only can different sizes of wellbore components be tested at a plurality of angles, but also certain angles can be simulated according to special needs to obtain the test result of the wellbore components under certain well inclination angles. The cost of such an experimental setup 100 would be relatively high relative to the last case, but would meet more specific detection requirements. Here, the wide diameter wellbore piece 5 may be supported by a further support structure to the centre of the annular arrangement and in rotational engagement with the support assembly 13 at this centre by means of a rotational bearing. Or the wide diameter wellbore piece 5 may be suspended from the ceiling by an additional support structure and rotation of the wide diameter wellbore piece 5 relative to the center of the annular arrangement is achieved by a swivel bearing.
It should be appreciated that the experimental set-up 100 may also be provided with only one wellbore assembly and the above-described rotating and supporting structure for that wellbore assembly, thereby allowing testing of that wellbore assembly at different angles.
It should also be appreciated that the wide diameter wellbore section 5 and the narrow diameter wellbore section 3 are removable and replaceable. Thus, the wide diameter shaft member 5 and the narrow diameter shaft member 3 of different sizes and different types can be replaced as required to meet experimental requirements.
In addition, in the embodiment shown in fig. 3, the outer diameter of the narrow bore element 3 is smaller than the outer diameter of the wide bore element 5, such that a first end of the narrow bore element 3 may be inserted into a first end of the wide bore element 5 to achieve a butt joint therebetween.
In the embodiment shown in fig. 3, a sealing cover plate 601 extending perpendicularly with respect to the axial direction of the wide diameter wellbore piece 5 and the narrow diameter wellbore piece 3 is provided between the first end of the narrow diameter wellbore piece 3 and the first end of the wide diameter wellbore piece 5. The first end of the seal cover 601 is opposite the side wall of the first end of the narrow bore component 3, on which is provided a seal groove 302 for sealing engagement (e.g., by a seal ring or the like) with the first end of the seal cover 601. The second end of the sealing cover plate 601 extends into the cover plate guide slot 6 and enables the sealing cover plate 601 to extend and retract relative to the cover plate guide slot 6, thereby enabling the first end of the sealing cover plate 601 to be adjacent to and sealingly engaged with the sealing groove 302 of the narrow bore member 3 and the second end of the sealing cover plate 601 to be remote from and spaced apart from the sealing groove 302 of the narrow bore member 3. The cover guide slot 6 is located outside the wide diameter wellbore piece 5. After the sealing cover plate 601 is sealingly engaged with the narrow diameter wellbore piece 3, the first end of the wide diameter wellbore piece 5 abuts against the surface of the sealing cover plate 601 in the axial direction and sealingly engages with the surface of the sealing cover plate 601 (e.g., by a seal ring). Thereby, the fitting and sealing between the narrow diameter wellbore piece 3 and the wide diameter wellbore piece 5 can be achieved.
The above-described extension and retraction of the seal cover 601 with respect to the cover guide groove 6 can be achieved by communicating the oil passage between the cover guide groove 6 and the driving oil pump 14. Thus, the driving oil pump 14 may pump hydraulic oil into the cover guide groove 6 to extend the sealing cover 601, or pump hydraulic oil from the cover guide groove 6 to retract the sealing cover 601.
In another embodiment, as shown in fig. 4, a cover guide slot 6 is mounted in a first end of the wide diameter wellbore piece 5 and extends perpendicular to the axial direction of the wide diameter wellbore piece 5. The sealing cover 6 is retractable under the guide of the cover guide groove 6. In this case, the cover guide groove 6 is fixedly connected in a sealing manner to the wide-diameter shaft part 5, for example, by being integrally formed, welded or connected in any other suitable manner.
In another embodiment, the sealing cover plate is secured directly to the sidewall of the first end of the narrow bore component 3. The wide diameter wellbore piece 5 may abut against the surface of the sealing cover plate in the axial direction to effect a seal as the first end of the narrow diameter wellbore piece 3 is moved towards the first end of the wide diameter wellbore piece 5.
Furthermore, as shown in fig. 3, the experimental device 100 may further comprise a first measuring means 4 arranged on a side wall of the first end of the narrow diameter wellbore section 3 and/or a first measuring means 7 arranged on a side wall of the first end of the wide diameter wellbore section 5. The above-described first measuring mechanisms 4 and 7 are configured to measure at least one of the temperature, pressure, acoustic impedance, and electrical impedance of the variable measuring portion. The acoustic impedance and/or electrical impedance measured by the first measuring means 4 and 7 is the acoustic impedance and/or electrical impedance perpendicular to the axial direction.
In addition, as shown in fig. 3, the experimental device 100 may further include a second measurement mechanism 8 disposed on a bottom wall of the second end of the narrow diameter wellbore section 3 and/or the wide diameter wellbore section 5. The second measuring mechanism 8 is configured to be able to measure at least one of temperature and pressure in the vicinity of the bottom wall and acoustic impedance and electrical impedance in the axial direction. The temperature and pressure measured by the second measuring means 8 are the temperature and pressure of the test fluid just entering the wellbore assembly or the temperature and pressure of the test fluid to leave the wellbore assembly.
By the data obtained by the measurement, the corresponding deposition rate, deposition amount and the like can be calculated. This is useful for predicting and generalizing the laws of deposition and clogging.
In addition, the entirety of the wide diameter wellbore element 5 and the narrow diameter wellbore element 3 (or at least their first ends) may be configured to be transparent to facilitate a user's observation of deposition and blockage within the wellbore assembly, particularly at the variable diameter portion. The deposition rate and the deposition amount obtained by the calculation are combined, so that the deposition and blockage rules can be further predicted and summarized. The wide diameter shaft member 5 and the narrow diameter shaft member 3 here may be made of plexiglas, for example, so that they can withstand pressures of 10MPa or more.
The pressure control diverter 11 above may be used to regulate the flow of test fluid into the wellbore assembly. In addition, the temperature and/or composition of the test fluid entering the test device 100 may also be adjusted accordingly. Thus, the condition of experimental fluids with different flow rates, pressures, temperatures and/or compositions can be detected. This can be used to simulate different well depths, different downhole conditions.
After the experiment, the pumping mechanism 16 may be replaced with an air compressor to deliver air into the wellbore assembly for a sweep operation. After separating the wide diameter wellbore section 5 and the narrow diameter wellbore section 3 from the column, the deposited plugs at the complicated sites (e.g., the variable diameter portions) can be easily removed.
While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.
Claims (9)
1. An experimental apparatus for detecting wellbore deposits, comprising a wellbore assembly including a wide-diameter wellbore member and a narrow-diameter wellbore member, the narrow-diameter wellbore member having an inner diameter smaller than an inner diameter of the wide-diameter wellbore member, a first end of the wide-diameter wellbore member and a first end of the narrow-diameter wellbore member butted together in an axial direction, a reducing portion formed inside a junction between the wide-diameter wellbore member and the narrow-diameter wellbore member,
Wherein the test fluid is capable of flowing in an axial direction into the wellbore assembly and through the variable diameter portion,
The experimental device comprises a plurality of narrow-diameter shaft pieces and a plurality of wide-diameter shaft pieces, wherein the plurality of narrow-diameter shaft pieces are arranged in an annular radial mode in a first longitudinal plane, the plurality of wide-diameter shaft pieces surround the plurality of narrow-diameter shaft pieces in the first longitudinal plane and are arranged in an annular radial mode, so that the directions of the wide-diameter shaft pieces are different from each other, the directions of the narrow-diameter shaft pieces are different from each other, and the first ends of the narrow-diameter shaft pieces can be inserted into the first ends of the wide-diameter shaft pieces opposite to the first ends of the narrow-diameter shaft pieces to form the reducing part.
2. The experimental set of claim 1, wherein the wide diameter wellbore piece and the narrow diameter wellbore piece are configured to be removable and installable with respect to each other.
3. The experimental device of claim 2, wherein the wide diameter wellbore element is movable in an axial direction proximate the narrow diameter wellbore element and/or the narrow diameter wellbore element is movable in an axial direction proximate the wide diameter wellbore element,
Such that the first end of the narrow diameter wellbore piece can be inserted into the first end of the wide diameter wellbore piece.
4. A testing device according to claim 2 or 3, wherein a sealing cover plate extending perpendicular to the axial direction of the wide and narrow bore members is provided between the wide and narrow bore members, the sealing cover plate being configured to sealingly engage the first ends of the wide and narrow bore members to effect a seal therebetween.
5. The experimental set of claim 4, wherein a sealing groove is configured on an outer sidewall of the first end of the narrow bore component, the sealing cover plate configured to be inserted into the sealing groove to seal with the narrow bore component.
6. The experimental set up of claim 4, wherein a first end of the sealing cover plate is configured to seal against the narrow bore component, a second end of the sealing cover plate is telescopically inserted into a cover plate guide slot, the cover plate guide slot is in communication with a sealing hydraulic passage,
When fluid is introduced into the cover plate guide groove through the sealing hydraulic channel, the sealing cover plate moves towards the narrow-diameter shaft piece until the first end of the sealing cover plate is sealed with the narrow-diameter shaft piece,
When fluid is pumped from within the cover plate guide slot through the seal hydraulic channel, the seal cover plate moves away from the narrow bore component such that the first end of the seal cover plate is separated from the narrow bore component.
7. A testing device according to any of claims 1 to 3, wherein at least two of the plurality of wide diameter wellbore pieces have different inner diameters relative to each other and/or at least two of the plurality of narrow diameter wellbore pieces have different inner diameters relative to each other.
8. A testing device according to any one of claims 1 to 3, wherein the plurality of narrow diameter wellbore pieces and/or the plurality of wide diameter wellbore pieces are configured to be rotatable about the centre of the arranged annulus.
9. A test device according to any one of claims 1 to 3, further comprising:
A first measurement mechanism mounted on a sidewall of the wide diameter wellbore piece and/or the first end of the narrow diameter wellbore piece, the first measurement mechanism configured to measure at least one of temperature, pressure, acoustic impedance, and electrical impedance at the first end of the wide diameter wellbore piece and/or the narrow diameter wellbore piece; and
A second measurement mechanism mounted on a bottom wall of the second end of the wide diameter wellbore member and/or the narrow diameter wellbore member, the second measurement mechanism configured to measure at least one of temperature, pressure, acoustic impedance, and electrical impedance at the second end of the wide diameter wellbore member and/or the narrow diameter wellbore member.
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