CN112033483A - Steam flow measuring device and steam injection pipeline using same - Google Patents
Steam flow measuring device and steam injection pipeline using same Download PDFInfo
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- CN112033483A CN112033483A CN202010916095.7A CN202010916095A CN112033483A CN 112033483 A CN112033483 A CN 112033483A CN 202010916095 A CN202010916095 A CN 202010916095A CN 112033483 A CN112033483 A CN 112033483A
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- 238000010793 Steam injection (oil industry) Methods 0.000 title claims abstract description 29
- 238000007789 sealing Methods 0.000 claims abstract description 143
- 238000005259 measurement Methods 0.000 claims abstract description 15
- 230000000903 blocking effect Effects 0.000 claims description 17
- 239000007788 liquid Substances 0.000 claims description 14
- 238000001125 extrusion Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 abstract description 12
- 238000012545 processing Methods 0.000 abstract description 8
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- 238000000034 method Methods 0.000 description 15
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- 239000003921 oil Substances 0.000 description 9
- 239000000295 fuel oil Substances 0.000 description 8
- 238000001514 detection method Methods 0.000 description 7
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- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
- G01F1/36—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
- G01F1/40—Details of construction of the flow constriction devices
- G01F1/44—Venturi tubes
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/005—Valves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/18—Supports or connecting means for meters
- G01F15/185—Connecting means, e.g. bypass conduits
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- General Physics & Mathematics (AREA)
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- Measuring Volume Flow (AREA)
Abstract
The invention relates to the technical field of steam flow measurement, in particular to a steam flow measuring device and a steam injection pipeline using the same. The vapor flow rate measuring device includes: a flow-impeding component; the Venturi tube is positioned behind the flow choking piece, and a throat part of the Venturi tube is provided with a throat part pressure taking hole; further comprising: the front end and the rear end of the pipe main body are respectively provided with a front joint and a rear joint which are used for connecting the steam flow measuring device to a steam injection pipeline in series; the venturi tube is fixed in the tube body; the tube main body is provided with an inlet pressure measuring hole and a throat pressure guiding hole, and the inlet pressure measuring hole is arranged on the front side of the Venturi tube and communicated with the inlet of the Venturi tube; the throat pressure guiding hole is communicated with the throat pressure taking hole; the vapor flow measurement device further includes: a front sealing structure arranged between the tube main body and the venturi tube; and a rear sealing structure disposed between the tube main body and the venturi tube. The steam flow measurement can greatly reduce the overall material and processing cost of the measurement device.
Description
Technical Field
The invention relates to the technical field of steam flow measurement, in particular to a steam flow measuring device and a steam injection pipeline using the same.
Background
The shallow thick oil thermal production well is usually developed by steam stimulation, the thick oil in the stratum is heated by injecting high-temperature steam into the well, and then the oil is lifted by an oil pumping machine for oil production. Because each boiler produces a large amount of steam and a single well injects a small amount of steam, one boiler is usually adopted to inject wet saturated steam into a plurality of heavy oil wells. At present, a flow-splitting and phase-splitting metering process is adopted to accurately meter the gas-liquid two-phase flow, and the equipment cost is as high as about 20 ten thousand yuan. Because the oil price is low and the development cost is high, the split-flow split-phase metering process cannot meet the requirement of low-cost development of shallow heavy oil fields. The existing flowmeters are used for one-way flow metering, and if the existing flowmeters are used for wet saturated steam flow metering, the flow metering error is large and can reach 30% -50%. Because of the lack of a reliable gas-liquid two-phase flow flowmeter, in a multi-hole well with combined steam injection, the actual steam injection amount of each hole is unclear, the steam absorption amount of a well with high stratum permeability is large, the steam absorption amount of a well with low stratum permeability is small, so that the oil recovery amount of some holes is influenced due to insufficient injection, the energy loss of some holes is caused due to over injection, and the effective utilization of steam is influenced.
The invention patent application with publication number CN101624907A discloses a downhole oil, water and gas mixed-phase flow measuring device, which comprises a venturi tube and a nozzle connected by a coupling, wherein the throat part of the venturi tube is provided with a throat part pressure-leading hole, the inlet of the venturi tube is provided with an inlet pressure-taking hole, when fluids with different flow states flow into the nozzle, the nozzle is used as a flow-resisting piece, the mixed phase is a homogeneous phase fluid under the action of injection, the homogeneous phase fluid passes through the venturi tube and generates pressure difference in front of and behind the venturi tube, and finally the flow of each phase is obtained by calculation. Because the fluid that flows through measuring device all has certain velocity of flow, can cause certain impact to venturi's pipe wall, consequently, venturi generally adopts the high hard alloy material of stand wear and tear to make, and this kind of material has the characteristics that material cost is high, the processing degree of difficulty is big, and, above-mentioned measuring device's venturi not only makes the fluid produce the pressure differential as detecting the piece, still be used for being connected with other detection pieces as the pipe main part, cause venturi whole size great, the structure is more complicated, and then make measuring device's material cost and processing cost all higher.
Disclosure of Invention
The invention aims to provide a steam flow measuring device, which aims to solve the problem that the flow measuring device in the prior art is high in cost; the invention also aims to provide the steam injection pipeline so as to improve the effective utilization rate of the steam by measuring the steam flow of the steam injection pipeline, thereby improving the recovery ratio of the thermal recovery of the thickened oil.
In order to achieve the purpose, the technical scheme of the steam flow measuring device is as follows:
steam flow measuring device includes:
the flow blocking part is arranged on the front side of the steam flow measuring device and is used for carrying out steam-liquid two-phase mixing on the steam flowing through the flow blocking part in a throttling mode;
the Venturi tube is positioned behind the flow choking piece and used for measuring the steam flow passing through the steam flow measuring device, and a throat part of the Venturi tube is provided with a throat part pressure measuring hole;
the vapor flow measurement device further includes:
the front end and the rear end of the pipe main body are respectively provided with a front joint and a rear joint which are used for connecting the steam flow measuring device to a steam injection pipeline in series;
the venturi tube is fixed in the tube body;
the tube main body is provided with an inlet pressure measuring hole and a throat pressure guiding hole, and the inlet pressure measuring hole is arranged on the front side of the Venturi tube and communicated with the inlet of the Venturi tube; the throat pressure guiding hole is communicated with the throat pressure taking hole;
the vapor flow measurement device further includes:
the front sealing structure is arranged between the tube main body and the Venturi tube and is positioned on the front side of the throat pressure taking hole;
and the rear sealing structure is arranged between the pipe main body and the Venturi tube and is positioned at the rear side of the throat pressure taking hole.
The invention has the beneficial effects that: compared with a comparison file, the overall size of the Venturi tube can be greatly reduced, the corresponding material cost and processing cost can be greatly reduced, and the tube main body can be made of alloy steel materials with high strength and low cost, so that the overall material cost and processing cost of the steam flow measuring device can be greatly reduced. In addition, the alloy steel material for manufacturing the pipe main body has the characteristics of high mechanical property, reliable connection and high pressure bearing capacity, which is deficient in the high-hardness alloy material for manufacturing the Venturi tube, so that the measuring device adopts a combined structure that the Venturi tube is fixed in the pipe main body, the safety and reliability of the measuring device can be effectively improved, and the service life of the measuring device can be prolonged.
As the preferred technical scheme, be equipped with the intercommunication annular on the inner wall of pipe main part and the outer wall of venturi, throat draws pressure hole and throat to get the pressure hole and is linked together through the intercommunication annular.
Has the advantages that: when fixing venturi in the pipe main part, even throat draws pressure hole and throat to get and presses the hole and have certain dislocation, also can be linked together through the intercommunication annular, reduced the assembly precision of venturi and pipe main part, be favorable to further reducing measuring device's manufacturing cost.
As a preferred technical scheme, the rear sealing structure is a high-temperature resistant extrusion sealing ring;
a backward back step surface is arranged in the tube main body and is positioned at the back side of the throat pressure taking hole;
the rear joint is provided with an inserting barrel section inserted into the pipe main body, the inserting barrel section is inserted into the pipe main body and is in threaded connection with the pipe main body, and a forward pushing surface is arranged on the inserting barrel section;
the rear side of the rear sealing structure is provided with a rear baffle ring, and the rear baffle ring is pushed by a pushing surface to extrude the rear sealing structure after the Venturi tube is fixed in the tube main body by screwing a rear connector, so that the front end of the rear sealing structure is blocked by a rear step surface and is tightly pressed in the tube main body; or,
the pushing surface is fixed in the tube main body by the venturi tube, and the rear sealing structure is extruded by screwing the rear connector, so that the front end of the rear sealing structure is blocked by the rear stepped surface and is tightly pressed in the tube main body.
Has the advantages that: the rear sealing structure is extruded simultaneously in the screwing process of the rear connector, and the rear sealing structure is compressed in the pipe body, so that the rear sealing structure is convenient to fix in the pipe body.
As a preferred technical scheme, a front baffle ring is arranged on the front side of the rear sealing structure;
the front baffle ring is pushed by the rear sealing structure and is stopped by the rear step surface when the rear sealing structure is extruded by screwing the rear connector after the venturi tube is fixed in the tube main body.
Has the advantages that: the front retaining ring can separate the rear sealing structure from the rear step surface, so that the rear joint is prevented from being difficult to screw due to overlarge friction force between the rear sealing structure and the rear step surface when the rear joint is screwed.
As a preferred technical scheme, a main body sealing structure is further arranged on the rear side of the rear baffle ring, and the main body sealing structure is a high-temperature-resistant extrusion sealing ring;
the inserting barrel section comprises a large-diameter section and a small-diameter section, the large-diameter section is arranged on the rear side of the small-diameter section, and the pushing surface is formed by the end surface, close to the small-diameter section, of the large-diameter section;
the main body sealing structure is arranged in a radial interval between the pipe main body and the small-diameter section;
after the Venturi tube is fixed in the tube main body, the main body sealing structure is tightly pressed on the rear baffle ring by the pushing surface of the pushing surface after the joint is screwed.
Has the advantages that: the main body sealing structure can seal the joint of the rear joint and the pipe main body, so that steam is prevented from leaking from the joint; in addition, the main body sealing structure and the rear sealing structure are simultaneously extruded in the screwing process of the rear connector, and the two sealing structures are respectively compressed, so that the rear sealing structure and the main body sealing structure are conveniently fixed in the pipe main body.
As a preferred technical scheme, the venturi tube includes the great section of external diameter and the less section of external diameter, the great section of external diameter sets up the rear side at the less section of external diameter, back seal structure sets up between the great section of external diameter and pipe main part.
Has the advantages that: the wall thickness of the rear side of the Venturi tube is increased, and the overall mechanical performance of the Venturi tube is improved.
As a preferred technical scheme, the front sealing structure is a high-temperature resistant extrusion sealing ring;
a sealing ring groove is formed in the outer wall of the Venturi tube;
a backward front step surface is arranged in the tube main body and is positioned on the front side of the throat pressure guide hole;
preceding seal structure cover is established in the seal ring inslot for venturi compresses tightly preceding seal structure on preceding step face by back to before pushing the interior setting position of pipe main part, the fixed of seal structure in the pipe main part and venturi in the pipe main part before realizing.
Has the advantages that: when venturi promoted to establish the setting in the pipe main part, realized the fixing of preceding seal structure, venturi in the body promptly, conveniently fix preceding seal structure, venturi in the body.
As a preferable technical scheme, the front end of the pipe main body is inserted in a front joint, and the pipe main body and the front joint are in sealing connection through a conical screw thread;
and a backward flow resisting part stopping surface is arranged in the front joint, and the flow resisting part is stopped and limited by the flow resisting stopping surface and the front end of the pipe main body in the front-back direction.
Has the advantages that: the front joint and the pipe main body are connected and sealed through the conical screw threads at the same time, a sealing element does not need to be additionally arranged at the front joint, and the whole structure of the steam flow measuring device is simplified.
As a preferred technical solution, the choke piece is a tubular structure, and the inner diameter of the choke piece gradually expands from front to back after contracting.
Has the advantages that: due to the arrangement form of the flow choking piece, the steam-liquid two-phase steam-liquid mixing can be guaranteed, and the steam-liquid two-phase steam-liquid mixing is guaranteed.
In order to achieve the purpose, the technical scheme of the steam injection pipeline is as follows:
the steam injection line includes: the steam pipes are connected in sequence;
the steam flow measuring device is connected in series on the steam injection pipeline;
steam flow measuring device includes:
the flow blocking part is arranged on the front side of the steam flow measuring device and is used for carrying out steam-liquid two-phase mixing on the steam flowing through the flow blocking part in a throttling mode;
the Venturi tube is positioned behind the flow choking piece and used for measuring the steam flow passing through the steam flow measuring device, and a throat part of the Venturi tube is provided with a throat part pressure measuring hole;
the vapor flow measurement device further includes:
the front end and the rear end of the pipe main body are respectively provided with a front joint and a rear joint which are used for connecting the steam flow measuring device to a steam injection pipeline in series;
the venturi tube is fixed in the tube body;
the tube main body is provided with an inlet pressure measuring hole and a throat pressure guiding hole, and the inlet pressure measuring hole is arranged on the front side of the Venturi tube and communicated with the inlet of the Venturi tube; the throat pressure guiding hole is communicated with the throat pressure taking hole;
the vapor flow measurement device further includes:
the front sealing structure is arranged between the tube main body and the Venturi tube and is positioned on the front side of the throat pressure taking hole;
and the rear sealing structure is arranged between the pipe main body and the Venturi tube and is positioned at the rear side of the throat pressure taking hole.
The invention has the beneficial effects that: compared with a comparison file, the overall size of the Venturi tube can be greatly reduced, the corresponding material cost and processing cost can be greatly reduced, and the tube main body can be made of alloy steel materials with high strength and low cost, so that the overall material cost and processing cost of the steam flow measuring device can be greatly reduced. In addition, the alloy steel material for manufacturing the pipe main body has the characteristics of high mechanical property, reliable connection and high pressure bearing capacity, which is deficient in the high-hardness alloy material for manufacturing the Venturi tube, so that the measuring device adopts a combined structure that the Venturi tube is fixed in the pipe main body, the safety and reliability of the measuring device can be effectively improved, and the service life of the measuring device can be prolonged.
As the preferred technical scheme, be equipped with the intercommunication annular on the inner wall of pipe main part and the outer wall of venturi, throat draws pressure hole and throat to get the pressure hole and is linked together through the intercommunication annular.
Has the advantages that: when fixing venturi in the pipe main part, even throat draws pressure hole and throat to get and presses the hole and have certain dislocation, also can be linked together through the intercommunication annular, reduced the assembly precision of venturi and pipe main part, be favorable to further reducing measuring device's manufacturing cost.
As a preferred technical scheme, the rear sealing structure is a high-temperature resistant extrusion sealing ring;
a backward back step surface is arranged in the tube main body and is positioned at the back side of the throat pressure taking hole;
the rear joint is provided with an inserting barrel section inserted into the pipe main body, the inserting barrel section is inserted into the pipe main body and is in threaded connection with the pipe main body, and a forward pushing surface is arranged on the inserting barrel section;
the rear side of the rear sealing structure is provided with a rear baffle ring, and the rear baffle ring is pushed by a pushing surface to extrude the rear sealing structure after the Venturi tube is fixed in the tube main body by screwing a rear connector, so that the front end of the rear sealing structure is blocked by a rear step surface and is tightly pressed in the tube main body; or,
the pushing surface is fixed in the tube main body by the venturi tube, and the rear sealing structure is extruded by screwing the rear connector, so that the front end of the rear sealing structure is blocked by the rear stepped surface and is tightly pressed in the tube main body.
Has the advantages that: the rear sealing structure is extruded simultaneously in the screwing process of the rear connector, and the rear sealing structure is compressed in the pipe body, so that the rear sealing structure is convenient to fix in the pipe body.
As a preferred technical scheme, a front baffle ring is arranged on the front side of the rear sealing structure;
the front baffle ring is pushed by the rear sealing structure and is stopped by the rear step surface when the rear sealing structure is extruded by screwing the rear connector after the venturi tube is fixed in the tube main body.
Has the advantages that: the front retaining ring can separate the rear sealing structure from the rear step surface, so that the rear joint is prevented from being difficult to screw due to overlarge friction force between the rear sealing structure and the rear step surface when the rear joint is screwed.
As a preferred technical scheme, a main body sealing structure is further arranged on the rear side of the rear baffle ring, and the main body sealing structure is a high-temperature-resistant extrusion sealing ring;
the inserting barrel section comprises a large-diameter section and a small-diameter section, the large-diameter section is arranged on the rear side of the small-diameter section, and the pushing surface is formed by the end surface, close to the small-diameter section, of the large-diameter section;
the main body sealing structure is arranged in a radial interval between the pipe main body and the small-diameter section;
after the Venturi tube is fixed in the tube main body, the main body sealing structure is tightly pressed on the rear baffle ring by the pushing surface of the pushing surface after the joint is screwed.
Has the advantages that: the main body sealing structure can seal the joint of the rear joint and the pipe main body, so that steam is prevented from leaking from the joint; in addition, the main body sealing structure and the rear sealing structure are simultaneously extruded in the screwing process of the rear connector, and the two sealing structures are respectively compressed, so that the rear sealing structure and the main body sealing structure are conveniently fixed in the pipe main body.
As a preferred technical scheme, the venturi tube includes the great section of external diameter and the less section of external diameter, the great section of external diameter sets up the rear side at the less section of external diameter, back seal structure sets up between the great section of external diameter and pipe main part.
Has the advantages that: the wall thickness of the rear side of the Venturi tube is increased, and the overall mechanical performance of the Venturi tube is improved.
As a preferred technical scheme, the front sealing structure is a high-temperature resistant extrusion sealing ring;
a sealing ring groove is formed in the outer wall of the Venturi tube;
a backward front step surface is arranged in the tube main body and is positioned on the front side of the throat pressure guide hole;
preceding seal structure cover is established in the seal ring inslot for venturi compresses tightly preceding seal structure on preceding step face by back to before pushing the interior setting position of pipe main part, the fixed of seal structure in the pipe main part and venturi in the pipe main part before realizing.
Has the advantages that: when venturi promoted to establish the setting in the pipe main part, realized the fixing of preceding seal structure, venturi in the body promptly, conveniently fix preceding seal structure, venturi in the body.
As a preferable technical scheme, the front end of the pipe main body is inserted in a front joint, and the pipe main body and the front joint are in sealing connection through a conical screw thread;
and a backward flow resisting part stopping surface is arranged in the front joint, and the flow resisting part is stopped and limited by the flow resisting stopping surface and the front end of the pipe main body in the front-back direction.
Has the advantages that: the front joint and the pipe main body are connected and sealed through the conical screw threads at the same time, a sealing element does not need to be additionally arranged at the front joint, and the whole structure of the steam flow measuring device is simplified.
As a preferred technical solution, the choke piece is a tubular structure, and the inner diameter of the choke piece gradually expands from front to back after contracting.
Has the advantages that: due to the arrangement form of the flow choking piece, the steam-liquid two-phase steam-liquid mixing can be guaranteed, and the steam-liquid two-phase steam-liquid mixing is guaranteed.
Drawings
FIG. 1 is a schematic structural view of a vapor flow rate measuring device according to embodiment 1 of the present invention;
FIG. 2 is a schematic view of a portion of the venturi of FIG. 1;
FIG. 3 is a schematic view of a portion of the structure at A in FIG. 1;
FIG. 4 is a schematic structural view of a vapor flow measuring device according to embodiment 2 of the present invention;
fig. 5 is a schematic structural diagram of a steam flow measuring device according to embodiment 4 of the present invention.
In the figure: 1-front clamp head; 2-a flow inhibitor; 3-a tube body; 4-front sealing ring; 5-a venturi tube; 6-rear sealing ring; 7-rear baffle ring; 8-a body seal ring; 9-rear clamp head; 10-front meter connector; 11-front pressure gauge; 12-rear pressure gauge; 13-rear meter connector; 14-throat pressure leading hole; 15-throat pressure tapping hole; 16-inlet pressure tapping hole; 17-a differential pressure transmitter; 18-a front baffle ring; 101-a choke stop face; 301-front step surface; 302-background step plane; 303-the pipe main body is communicated with the ring groove; 501-sealing ring grooves; 502-venturi tube communicating ring groove; 901-pushing the surface; 100-front joint; 900-rear joint.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The features and properties of the present invention are described in further detail below with reference to examples.
Based on the prior art, the method adopts the split-flow split-phase measurement to measure the steam injection flow of the heavy oil well, has high equipment cost and can not meet the requirement of low-cost development of the heavy oil well; the steam flow measuring device is designed, and the steam flow measuring device is connected to a steam injection pipeline of the heavy oil well when in use and is used for measuring the steam flow injected by each well.
Compared with the mode of measuring the gas injection quantity by adopting the split-flow split-phase method, the steam flow measuring device has the advantage of low price, and is beneficial to large-scale application; compared with the existing flowmeter, the steam flow measuring device has the advantage of high measurement precision, and can reliably measure the steam flow injected into each well, thereby effectively avoiding the problem of insufficient injection or over injection of the heavy oil well and being beneficial to improving the heavy oil thermal recovery ratio. The vapor flow measuring device of the present invention will be described below by way of specific examples.
Specific embodiment 1 of the steam flow measuring device of the present invention:
as shown in fig. 1 and 2, the vapor flow rate measuring device includes a pipe body 3 and two clamp heads that are screwed to both axial ends of the pipe body 3. The two clamp heads are used as joints of the pipe main body and are used for being connected with a steam injection pipeline. The front side of the pipe main body 3 is provided with a flow choking part 2, a Venturi tube 5 is fixed in the pipe main body 3, and the flow choking part 2 is arranged on the front side of the Venturi tube 5. The flow resisting piece 2 is of a tubular structure, the inner diameter of the flow resisting piece 2 is gradually enlarged after being contracted from front to back, and the flow resisting piece is used for carrying out vapor-liquid two-phase mixing on steam flowing through the flow resisting piece 2 in a throttling mode. The steam flow measuring device further comprises a pressure measuring device, and the pressure measuring device obtains the steam pressure difference value between the inlet and the throat of the Venturi tube 5 through measurement.
As shown in fig. 1 to 3, an inlet pressure measuring hole 16 is formed in the front side of the venturi tube 5 on the tube main body 3, a front pressure gauge 10 is fixed to the inlet pressure measuring hole 16, a front pressure gauge 11 is connected to the front pressure gauge 10, and the front pressure gauge 11 is used for measuring pressure at the inlet of the venturi tube 5. Be equipped with the throat at venturi 5's throat and get pressure hole 15, it draws pressure hole 14 to be equipped with the throat on pipe main part 3, throat draws pressure hole 14 and throat to get pressure hole 15 and is linked together, draw pressure hole 14 fixed back table joint 13 of department simultaneously at the throat, be connected with back manometer 12 on the back table joint 13, back manometer 12 is used for measuring venturi 5 throat's pressure, subtract the pressure that measures through two manometers, obtain venturi 5's entrance and the steam pressure difference of throat. The front pressure gauge 11 and the rear pressure gauge 12 are pressure detection devices of the steam flow measuring device. It should be noted that, in order to ensure that the throat pressure guiding hole 14 is communicated with the throat pressure taking hole 15, a pipe main body communicating ring groove 303 is arranged in the pipe main body 3, and an inner end opening of the throat pressure guiding hole 14 is arranged on the bottom of the pipe main body communicating ring groove 303; the periphery of the venturi tube 5 is provided with a venturi tube communicating ring groove 502, and the outer end opening of the throat pressure taking hole 15 is arranged on the groove bottom of the venturi tube communicating ring groove 502. In addition, the throat pressure taking holes 15 are four, and the four throat pressure taking holes 15 are uniformly distributed along the circumferential direction of the Venturi tube 5.
As shown in fig. 1, a front clamp head 1 is a clamp head provided on the front side of the pipe body 3, and a rear clamp head 9 is a clamp head provided on the rear side of the pipe body 3. The front end of the pipe main body 3 is inserted into the front clamp head 1, and the front clamp head 1 is connected with the pipe main body 3 in a sealing manner through a conical screw thread. The inner hole of the front hoop head 1 is a stepped hole, a backward step surface is arranged in the stepped hole, the stepped surface is used as a flow blocking piece stopping surface 101, the front end of the flow blocking piece 2 is stopped by the flow blocking piece stopping surface, the rear end of the flow blocking piece 2 is stopped by the front end surface of the pipe main body 3, and the positioning of the flow blocking piece 2 in the pipe main body is realized. It should be noted that, since the front collar clamp 1 and the pipe main body 3 are connected by the tapered thread seal, a sufficient distance should be reserved between the choke stop surface and the front end of the pipe main body 3, so as to prevent the choke 2 from being clamped by the choke stop surface and the front end of the pipe main body 3 when the front collar clamp 1 is not connected with the pipe main body 3, which affects the seal between the front collar clamp 1 and the pipe main body 3.
As shown in fig. 1, in order to secure the sealing property between the venturi tube 5 and the tube main body 3, a front seal ring 4 and a rear seal ring 6 are provided between the tube main body 3 and the venturi tube 5, the front seal ring 4 serving as a front sealing structure, and the rear seal ring 6 serving as a rear sealing structure. Steam flow measuring device keeps off ring 7, preceding fender ring 18 and main part sealing ring 8 after still including, and main part sealing ring 8 is as main part seal structure, and preceding sealing ring 4, back sealing ring 6 and main part sealing ring 8 are high temperature resistance's extrusion sealing ring. The front sealing ring 4 and the rear sealing ring 6 are arranged between the tube main body 3 and the Venturi tube 5, the front sealing ring 4 is positioned on the front side of the throat pressure guide hole 14, and the rear sealing ring 6 is positioned on the rear side of the throat pressure guide hole 14, so that the steam flowing through the throat pressure taking hole 15 is prevented from leaking between the tube main body 3 and the Venturi tube 5, and the pressure detection at the throat pressure guide hole 14 is influenced; the main part sealing ring 8 is arranged between the pipe main body 3 and the rear hoop head 9, and steam leakage from the joint of the pipe main body 3 and the rear hoop head 9 is avoided.
Specifically, as shown in fig. 1 and 2, the inner hole of the tube main body 3 is also a stepped hole, and the stepped hole has two backward-facing stepped surfaces, namely a front stepped surface 301 and a back stepped surface 302, the front stepped surface 301 is located on the front side of the throat pressure guiding hole 14, and the back stepped surface 302 is located on the back side of the throat pressure guiding hole 14. The periphery of venturi 5 is equipped with seal ring groove 501, and preceding sealing ring 4 cover is established in seal ring groove 501, and after venturi 5 is by the back to preceding inserting pipe main part 3 internal fixation back, the rear side cell wall of seal ring groove 501 compresses tightly preceding sealing ring 4 on preceding step face 301, realizes the fixing of preceding sealing ring 4 in pipe main part 3. The insertion position of the venturi tube 5 into the tube main body 3 as described herein means a position of the venturi tube 5 in the tube main body 3 when the throat pressure taking hole 15 and the throat pressure introducing hole 14 communicate with each other.
Above-mentioned back clamp head 9 is including inserting a section of thick bamboo section, inserts a section of thick bamboo section and includes big footpath section and path section, and big footpath section sets up in the rear side of path section, and the terminal surface that is close to the path section of big footpath section constitutes ejection face 901, is equipped with the joint external screw thread on the section of big footpath, and the rear end of pipe main part 3 is equipped with pipe main part internal thread. After the venturi tube 5 is installed in the tube main body 3, the front retaining ring 18, the rear sealing ring 6, the rear retaining ring 7 and the main body sealing ring 8 are sequentially installed in the tube main body 3, then, the inserting barrel section of the rear clamping head 9 is inserted at the rear end of the tube main body 3, then, the rear clamping head 9 is screwed, after the joint external thread is in place in threaded connection with the tube main body internal thread, the rear clamping head 9 compresses the main body sealing ring 8 at the rear end of the rear retaining ring 7, the rear retaining ring 7 compresses the rear sealing ring 6 on the front retaining ring 18, the front retaining ring 18 compresses on the rear step surface 302, and the fixation of the rear sealing ring 6 and the main body sealing ring 8 in the tube main body 3 is realized.
After the front seal ring 4 and the rear seal ring 6 are axially compressed, the front seal ring 4 and the rear seal ring 6 are pressed against the pipe body 3 and the venturi tube 5 due to deformation in the radial direction of the pipe body, and the venturi tube 5 is fixed in the pipe body by pressing the front seal ring 4 and the rear seal ring 6. The front sealing ring 4, the rear sealing ring 6 and the main body sealing ring 8 are all graphite rings, the high temperature resistance of the graphite rings is more than 500 ℃, and after the measuring device is connected to a steam injection pipeline for use, each sealing ring still has a good sealing effect. The steam flow measuring device is applied to the flow measurement of steam with high temperature, high pressure and high flow velocity, so that the flow choking part 2 and the Venturi tube 5 are both made of corrosion-resistant hard alloy materials, and the steam flow measuring device has the characteristics of high cost, wear resistance, high processing difficulty and poor welding performance; the pipe main body 3 is made of low-carbon alloy materials and has the advantages of being low in cost, good in strength and convenient to process, and the steam flow measuring device is designed by combining the pipe main body 3, the flow choking piece 2 and the Venturi tube 5, so that the steam flow measuring device has the advantages of being high in comprehensive mechanical performance, reliable in connection and high in pressure bearing capacity, and also has the advantages of being safe and reliable, long in service life and low in manufacturing cost.
When the steam-liquid phase mixing device is used, steam entering the pipe main body flows through the flow resisting piece 2 firstly, and the steam is disturbed through the throttling effect of the flow resisting piece 2, so that steam and liquid phases flowing through the steam in the flow resisting piece 2 are fully mixed to form homogeneous fluid; then the steam flows through the Venturi tube 5, and the steam pressure difference between the inlet and the throat of the Venturi tube 5 is calculated according to pressure data obtained by the front pressure gauge 11 and the rear pressure gauge 12.
Defining the pressure measured by the pressure gauge 11 before the pressure is P1The pressure measured by the rear pressure gauge 12 is P2The difference of steam pressure is P, then
P＝P1-P2
By applying bernoulli's theorem and the continuity equation, the relationship between the steam flow through the venturi tube 5 and the steam pressure difference can be obtained:
k above1The structural parameters are calculated by the inlet section and the throat section of the Venturi tube 5; k above2The dryness parameter of the steam can be measured by other measuring devices in the prior art.
Based on the formula, the steam flow detection device is calibrated by using the steam flow and dryness data generated by a single boiler, and a calibration relational expression of the difference value P between the flow Q and the steam pressure at different dryness is established.
When the steam flow measuring device is used specifically, the two clamp heads of the steam flow measuring device are connected with a steam pipe of a heavy oil well to be measured, the steam flow measuring device is connected to a steam injection pipeline in series, and a steam pressure difference value P between an inlet of a venturi tube and a throat part is measured; meanwhile, the dryness value K of the steam produced by each boiler is measured by other measuring devices in the prior art2For the same steam flow rate detection device, K1The value is a fixed value, and the steam flow of the steam injection pipeline can be obtained through calculation according to the obtained calibration relation.
the difference value of the steam pressure in the embodiment 1 is obtained by subtracting the pressures measured by the front pressure gauge arranged at the inlet of the venturi tube and the rear pressure gauge arranged at the throat part of the venturi tube; as shown in fig. 4, in the present embodiment, a differential pressure transducer 17 is connected between the inlet pressure tapping hole 16 and the throat pressure tapping hole 14, and the pressure difference between the inlet and the throat of the venturi tube is directly obtained by the differential pressure transducer 17.
the spoiler in the above embodiment 1 is constituted by a spoiler; the flow resisting element in this embodiment is made of a perforated plate, that is, the perforated plate replaces the flow resisting element in embodiment 1, and when the steam flowing into the pipe body flows through the perforated plate, the steam and the liquid phases of the steam are fully mixed by the throttling function of the perforated plate and the collision function of the fluid and the hole wall of the perforated plate.
the joints in the embodiment 1 are all clamp heads, and the steam flow measuring device and the steam injection pipeline are detachably connected through the clamp heads; as shown in fig. 5, in the present embodiment, neither the front joint 100 provided at the front side of the pipe body nor the rear joint 900 provided at the rear side of the pipe body is provided with a clamp structure, and the front joint 100 and the rear joint 900 are directly fixed to the steam pipe of the steam injection line by welding.
above-mentioned embodiment 1 is equipped with the main part sealing ring between pipe main part and the back clamp head, and the main part sealing ring is used for sealing up pipe main part and back clamp head junction. In this embodiment, the rear clamp head and the pipe main body are connected in a sealing manner through the tapered screw threads, and an inner hole of the insertion tube section of the rear clamp head is a tapered hole with a large front part and a small rear part, when the rear clamp head is screwed, the rear end of the venturi tube is inserted into the inner hole of the insertion tube section, the front end surface of the insertion tube section is used as a pushing surface 901 to push the rear sealing ring, after the rear clamp head is screwed, the rear end of the venturi tube is pushed tightly on the inner hole wall of the insertion tube section, and the front end surface of the insertion tube section compresses the rear sealing ring in the pipe main body.
the steam flow measuring device in embodiment 1 includes the front retainer ring, the front retainer ring is sandwiched between the rear step surface and the rear seal ring, and the rear end of the rear seal ring is retained by the rear retainer ring and the front end is retained by the front retainer ring to be fixed in the pipe main body. The steam flow measuring device in the embodiment does not comprise the front retaining ring, and the rear sealing ring is directly compressed on the rear step surface through the rear retaining ring, so that the rear sealing ring is fixed in the pipe main body.
Specific example 7 of the steam flow measuring device of the present invention:
the venturi tube in the embodiment 1 is provided with the sealing ring groove, the front sealing ring is sleeved in the sealing ring groove of the venturi tube, and the venturi tube is tightly pressed on the front step surface after being inserted in place, so that the venturi tube is fixed in the tube main body. In this embodiment set up the seal ring groove in the pipe main part, set up the sealed face forward simultaneously on venturi, preceding sealing ring is placed earlier in the seal ring groove of pipe main part, later after venturi cartridge targets in place, and the back is sealed the face and is compressed tightly preceding sealing ring, realizes the fixing of preceding sealing ring in the pipe main part.
the venturi tube in the above embodiment 1 is fixed in the tube main body by the tightening of the front and rear seal rings. In this embodiment, a rearward detection member stopper surface is provided in the pipe main body, the front end of the venturi tube is stopped by the detection member stopper surface, and the rear end is stopped by the front end of the rear clamp head, thereby achieving fixation in the pipe main body. At the moment, the front sealing ring and the rear sealing ring only play a role in sealing and do not play a role in positioning the Venturi tube any longer.
in the embodiment 1, the front clamp head is hermetically connected with the pipe main body through the tapered screw threads; in this embodiment, the front clamp head is in threaded connection with the pipe main body, and a flow blocking sealing ring is arranged at the joint of the pipe main body and the front clamp head, so that the joint of the front clamp head and the pipe main body is sealed through the flow blocking sealing ring. Specifically, a backward flow-resisting sealing ring blocking surface is arranged in the front hoop head, the flow-resisting sealing ring blocking surface is arranged on the rear side of the flow-resisting piece blocking surface, and two ends of the flow-resisting sealing ring are respectively pressed by the flow-resisting sealing ring blocking surface and the front end of the pipe main body, so that the flow-resisting sealing ring is fixed in the pipe main body.
the choke piece in the above embodiment 1 is stopped and limited by the choke piece stopper surface and the front end of the tube main body. The direct threaded connection of choker in this embodiment is in the pipe main part, and is concrete, sets up the connection internal thread at the front end of pipe main part, sets up the connection external screw thread simultaneously on the outer wall of choker, connects the internal thread and is connected the spacing that the realization choker of external screw thread connection.
Specific example 1 of the steam injection line of the present invention:
the steam injection pipeline comprises steam pipes and a steam flow measuring device, the steam pipes are connected in sequence, and the steam flow measuring device is connected to the steam injection pipeline in series; the steam flow measuring device has the same structure as the steam flow measuring device described in embodiment 1 of the steam flow measuring device, and is not described again.
During the specific use, steam flow measuring device's preceding clamp head is connected with the choke valve of annotating the steam pipeline, back clamp head is connected with the viscous crude well head, and steam by steam pipe flow direction steam flow measuring device is through the choke valve throttle earlier and tentatively mix the looks, mixes the looks once more through steam flow measuring device's choker piece again, makes the vapour night two-phase of steam mix more evenly, later through venturi and by back clamp head inflow viscous crude well in.
Of course, in other embodiments, the steam flow measuring device may also be connected between any two steam pipes to achieve flow measurement of the steam injection pipeline; the vapor flow rate measuring device may also employ the vapor flow rate measuring device described in any one of the above-described specific embodiments 2 to 10 of the vapor flow rate measuring device.
The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention, the scope of the present invention is defined by the appended claims, and all structural changes that can be made by using the contents of the description and the drawings of the present invention are intended to be embraced therein.
Claims (10)
1. Steam flow measuring device includes:
the flow blocking part is arranged on the front side of the steam flow measuring device and is used for carrying out steam-liquid two-phase mixing on the steam flowing through the flow blocking part in a throttling mode;
the Venturi tube is positioned behind the flow choking piece and used for measuring the steam flow passing through the steam flow measuring device, and a throat part of the Venturi tube is provided with a throat part pressure measuring hole;
characterized by, the steam flow measuring device still includes:
the front end and the rear end of the pipe main body are respectively provided with a front joint and a rear joint which are used for connecting the steam flow measuring device to a steam injection pipeline in series;
the venturi tube is fixed in the tube body;
the tube main body is provided with an inlet pressure measuring hole and a throat pressure guiding hole, and the inlet pressure measuring hole is arranged on the front side of the Venturi tube and communicated with the inlet of the Venturi tube; the throat pressure guiding hole is communicated with the throat pressure taking hole;
the vapor flow measurement device further includes:
the front sealing structure is arranged between the tube main body and the Venturi tube and is positioned on the front side of the throat pressure taking hole;
and the rear sealing structure is arranged between the pipe main body and the Venturi tube and is positioned at the rear side of the throat pressure taking hole.
2. The steam flow measuring device of claim 1, wherein at least one of the inner wall of the tube body and the outer wall of the venturi tube is provided with a communication ring groove, and the throat pressure introduction hole and the throat pressure taking hole are communicated with each other through the communication ring groove.
3. The steam flow measuring device of claim 1 or 2, wherein the rear sealing structure is a high temperature resistant extruded sealing ring;
a backward back step surface is arranged in the tube main body and is positioned at the back side of the throat pressure taking hole;
the rear joint is provided with an inserting barrel section inserted into the pipe main body, the inserting barrel section is inserted into the pipe main body and is in threaded connection with the pipe main body, and a forward pushing surface is arranged on the inserting barrel section;
the rear side of the rear sealing structure is provided with a rear baffle ring, and the rear baffle ring is pushed by a pushing surface to extrude the rear sealing structure after the Venturi tube is fixed in the tube main body by screwing a rear connector, so that the front end of the rear sealing structure is blocked by a rear step surface and is tightly pressed in the tube main body; or,
the pushing surface is fixed in the tube main body by the venturi tube, and the rear sealing structure is extruded by screwing the rear connector, so that the front end of the rear sealing structure is blocked by the rear stepped surface and is tightly pressed in the tube main body.
4. The steam flow measuring device of claim 3, wherein a front stop ring is provided on a front side of the rear seal structure;
the front baffle ring is pushed by the rear sealing structure and is stopped by the rear step surface when the rear sealing structure is extruded by screwing the rear connector after the venturi tube is fixed in the tube main body.
5. The steam flow measuring device of claim 3, wherein a main body sealing structure is further arranged on the rear side of the rear baffle ring, and the main body sealing structure is a high-temperature-resistant extrusion sealing ring;
the inserting barrel section comprises a large-diameter section and a small-diameter section, the large-diameter section is arranged on the rear side of the small-diameter section, and the pushing surface is formed by the end surface, close to the small-diameter section, of the large-diameter section;
the main body sealing structure is arranged in a radial interval between the pipe main body and the small-diameter section;
after the Venturi tube is fixed in the tube main body, the main body sealing structure is tightly pressed on the rear baffle ring by the pushing surface of the pushing surface after the joint is screwed.
6. The steam flow measuring device of claim 3, wherein the venturi tube includes a larger outer diameter section and a smaller outer diameter section, the larger outer diameter section being disposed at a rear side of the smaller outer diameter section, the rear seal structure being disposed between the larger outer diameter section and the tube body.
7. The steam flow measuring device of claim 1 or 2, wherein the front sealing structure is a high temperature resistant extruded sealing ring;
a sealing ring groove is formed in the outer wall of the Venturi tube;
a backward front step surface is arranged in the tube main body and is positioned on the front side of the throat pressure guide hole;
preceding seal structure cover is established in the seal ring inslot for venturi compresses tightly preceding seal structure on preceding step face by back to before pushing the interior setting position of pipe main part, the fixed of seal structure in the pipe main part and venturi in the pipe main part before realizing.
8. The steam flow measuring device of claim 1 or 2, wherein the front end of the pipe body is inserted into the front joint, and the pipe body and the front joint are hermetically connected by a tapered thread;
and a backward flow resisting part stopping surface is arranged in the front joint, and the flow resisting part is stopped and limited by the flow resisting stopping surface and the front end of the pipe main body in the front-back direction.
9. The steam flow measuring device of claim 1 or 2, wherein the flow resisting element is a tubular structure, and the inner diameter of the flow resisting element gradually expands from front to back after first contracting.
10. A steam injection line comprising: the steam pipes are connected in sequence;
the steam flow measuring device is connected in series on the steam injection pipeline;
characterized in that the steam flow measuring device is the steam flow measuring device according to any one of claims 1 to 9.
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| CN202010916095.7A CN112033483B (en) | 2020-09-03 | 2020-09-03 | Steam flow measuring device and steam injection pipeline using same |
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| CN114005556A (en) * | 2021-10-25 | 2022-02-01 | 山东核电设备制造有限公司 | Combined type current-limiting Venturi tube suitable for CVS and machining method thereof |
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| CN117146910A (en) | 2023-12-01 |
| CN112033483B (en) | 2023-09-15 |
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