CN110756072B - Mixing device and mixing method for oilfield associated gas and oil gas mixed transportation - Google Patents
Mixing device and mixing method for oilfield associated gas and oil gas mixed transportation Download PDFInfo
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- CN110756072B CN110756072B CN201911076065.3A CN201911076065A CN110756072B CN 110756072 B CN110756072 B CN 110756072B CN 201911076065 A CN201911076065 A CN 201911076065A CN 110756072 B CN110756072 B CN 110756072B
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000003921 oil Substances 0.000 claims abstract description 345
- 230000005540 biological transmission Effects 0.000 claims abstract description 98
- 239000010779 crude oil Substances 0.000 claims abstract description 81
- 239000007788 liquid Substances 0.000 claims abstract description 24
- 230000001105 regulatory effect Effects 0.000 claims description 29
- 230000003014 reinforcing effect Effects 0.000 claims description 21
- 238000007789 sealing Methods 0.000 claims description 11
- 230000002349 favourable effect Effects 0.000 claims description 7
- 230000008859 change Effects 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 238000009491 slugging Methods 0.000 claims description 6
- 238000004090 dissolution Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims 1
- 230000000149 penetrating effect Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/30—Injector mixers
- B01F25/31—Injector mixers in conduits or tubes through which the main component flows
- B01F25/313—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/2366—Parts; Accessories
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L41/00—Branching pipes; Joining pipes to walls
- F16L41/02—Branch units, e.g. made in one piece, welded, riveted
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/18—Arrangements for supervising or controlling working operations for measuring the quantity of conveyed product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
- B01F2101/501—Mixing combustion ingredients, e.g. gases, for burners or combustion chambers
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
Abstract
The invention discloses a mixing device and a mixing method for oil-gas mixed transportation of oilfield associated gas, wherein the mixing device comprises a front oil inlet pipe, a rear oil outlet pipe, a gas transmission central pipe and a mixing pipe, wherein the front oil inlet pipe is connected with one end of the mixing pipe, the rear oil outlet pipe is connected with the other end of the mixing pipe, the front oil inlet pipe, the rear oil outlet pipe and the mixing pipe are coaxial, one end of the gas transmission central pipe penetrates through the mixing pipe and is sleeved in the mixing pipe in an annular mode, a plurality of gas outlet holes are formed in the gas transmission central pipe sleeved in the mixing pipe, the size of the gas transmission central pipe in the crude oil flowing direction is smaller than that of the mixing pipe, a gas-liquid mixing cavity is formed in the mixing pipe and at the position, close to the rear oil outlet pipe, of the front oil inlet pipe and the rear oil outlet pipe are respectively connected with an oil delivery pipeline, and the end, located outside the mixing pipe, of the gas transmission central pipe is connected with an associated gas pressurizing and transporting pipeline.
Description
Technical Field
The invention belongs to the technical field of oil and gas gathering and transportation, and particularly relates to a mixing device and a mixing method for oilfield associated gas and oil gas mixing and transportation.
Background
At present, the domestic ground recovery process for recovering the oilfield associated gas mainly adopts two modes of associated gas separate transportation and mixed transportation. When the oil-gas mixing and conveying process is designed, a pressurizing gas pipeline is welded on the oil pipeline in a simple T-shaped manner. Because the T-shaped joint pipe diameter is not changed and the contact area of associated gas and transported crude oil is limited, the oil-gas mixing is uneven, the gas-oil solubility is low, and the flow states such as laminar flow, slipping, slug flow and the like caused by mixing a large amount of gas are easily formed, so that the oil transportation pressure is quickly increased, the mixed transportation gas carrying capacity is reduced, and the system safety risk is increased.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a mixing device and a mixing method for oilfield associated gas-oil gas mixed transportation, which overcome the defects of 1: the T-shaped welding causes uneven oil-gas mixing because the pipe diameter of the T-shaped joint is not changed and the contact area of associated gas and crude oil is limited; 2: the T-shaped welding has low gas-oil solubility, is extremely easy to form flow states such as laminar flow, slip, slug flow and the like caused by mixing of a large amount of gas, and causes rapid rise of oil transportation pressure, reduction of gas carrying capacity of mixed transportation and increase of system safety risk; 3: the prior art has no problems of a mixing device for efficient mixing and conveying, and the like.
In order to solve the technical problems, the technical scheme of the invention is as follows: the utility model provides a mixing arrangement for oil field associated gas oil gas is mixed and is failed, includes front end oil feed pipe, rear end play oil pipe, gas-supply center tube and hybrid tube, and wherein the one end of hybrid tube is advanced oil feed pipe connection, the other end of hybrid tube is connected to the rear end play oil pipe, and wherein front end oil feed pipe, rear end play oil pipe and hybrid tube are coaxial, the inside hybrid tube is located to gas-supply center tube one end through hybrid tube and annular space cover, and wherein the cover is located and is equipped with a plurality of ventholes on the inside gas-supply center tube of hybrid tube, the size of gas-supply center tube along crude oil flow direction is less than the size of hybrid tube, wherein in hybrid tube inside and in gas-supply center tube be close to rear end play oil pipe department and form gas-liquid mixing chamber, the oil pipeline is connected respectively to the one end that hybrid tube was kept away from to front end play oil pipe, and wherein the gas-supply center tube is in the end connection associated gas pressure boost delivery line of hybrid tube outside.
Preferably, one end of the front oil inlet pipe, which is far away from the mixing pipe, is provided with a front oil inlet flange, one end of the rear oil outlet pipe, which is far away from the mixing pipe, is provided with a rear oil outlet flange, the front oil inlet flange and the rear oil outlet flange are respectively connected with an oil pipeline, and the end of the gas transmission central pipe, which is positioned outside the mixing pipe, is provided with an air inlet flange, wherein the air inlet flange is connected with an associated gas pressurizing and conveying pipeline.
Preferably, gate valves are respectively arranged on the oil delivery pipelines connected with the front oil inlet flange and the rear oil outlet flange, an oil delivery pump is arranged on the oil delivery pipeline connected with the front oil inlet flange or the rear oil outlet flange, and a gas flowmeter and a gas regulating valve are sequentially arranged on the associated gas pressurizing and conveying pipeline connected with the air inlet flange and used for recording and regulating the input quantity of associated gas.
Preferably, the gas transmission central tube is connected by two connecting pipes which are 90 degrees intersected, wherein one connecting pipe is sleeved inside the mixing pipe, the other connecting pipe radially penetrates through the wall of the mixing pipe and is connected with the connecting pipe arranged inside the mixing pipe, and a plurality of gas outlet holes are uniformly formed in the connecting pipe arranged inside the mixing pipe, and the connecting pipe arranged inside the mixing pipe is coaxial with the mixing pipe.
Preferably, an inclination angle exists between the opening direction of the air outlet hole and the flow direction of the crude oil, wherein the inclination angle is 90-135 degrees, the inclination angle is favorable for dissolving associated gas into the transported crude oil, and part of undissolved associated gas also exists in the crude oil in a uniformly distributed small bubble state.
Preferably, the gas transmission center tube is arranged between the outer wall of the connecting tube in the mixing tube and the inner wall of the mixing tube, and the reinforcing rotor is welded between the outer wall of the connecting tube and the inner wall of the mixing tube according to the forward rotation direction, so that crude oil is slightly in forward rotation flow state in the conveying process, the conveyed crude oil is always in contact with the inner wall of the mixing tube, and the additional friction caused by laminar flow, slipping and slugging caused by mixing of associated gas is relieved.
Preferably, the gas transmission center tube is arranged between the outer wall of the connecting tube in the mixing tube and the inner wall of the mixing tube, three reinforcing rotors are uniformly arranged on the circumference of the outer wall of the connecting tube, the included angle between the forward rotation direction and the crude oil flowing direction is a forward rotation angle, the forward rotation angle is the included angle between the central connecting line of the two edges of the reinforcing rotors along the crude oil flowing direction and the crude oil flowing direction, and the forward rotation angle is 15-60 degrees.
Preferably, sealing rings are arranged at the joints of the front oil inlet pipe and the mixing pipe, the rear oil outlet pipe and the mixing pipe, and the gas transmission central pipe and the mixing pipe.
Preferably, a mixing method of the mixing device for oilfield associated gas-oil gas mixing transmission according to any one of the above claims comprises the following steps:
step 1), the input end of a front oil inlet pipe and the output end of a rear oil outlet pipe are respectively connected with an oil delivery pipeline in a horizontal state, the input end of a gas delivery central pipe is connected with an associated gas pressurizing and delivering pipeline in a horizontal state, gate valves and oil delivery pumps are arranged at the joints of the input end of the front oil inlet pipe and the output end of the rear oil outlet pipe and the oil delivery pipeline, then a gas regulating valve is arranged at the joint of the input end of the gas delivery central pipe and the associated gas pressurizing and delivering pipeline, then sealing rings are arranged at the joints of the front oil inlet pipe, the rear oil outlet pipe, the gas delivery central pipe and the mixing pipe, sealing performance is checked, and finally a bypass pipe is integrally arranged in the mixing device;
step 2), sequentially opening gate valves at the front oil inlet pipe and the rear oil outlet pipe, closing a bypass pipe, and starting an oil delivery pump to deliver oil;
and 3) after the oil transportation parameters are stable, slowly opening a gas regulating valve to introduce associated gas, mixing the associated gas with crude oil after passing through gas outlet holes uniformly distributed on a gas transportation central tube, generating a slight positive rotation flow state after passing through a reinforcing rotor wing arranged in a positive rotation direction, forming a gas-carrying mixed liquid with high gas-oil ratio and gas-in-oil flow state, gradually regulating the gas quantity mixed into the associated gas according to the change of the pipe transportation pressure, fully mixing and dissolving the associated gas and the transported crude oil in a gas-liquid mixing cavity, and transporting the mixed gas and the transported crude oil to a downstream station.
Compared with the prior art, the invention has the advantages that:
(1) The gas transmission central tube is arranged in the mixing tube, so that the gas transmission central tube is sleeved in the mixing tube in an annular mode, a plurality of gas outlet holes are formed in the gas transmission central tube, the hole opening direction of the gas outlet holes and the crude oil flowing direction form an inclination angle which is 90-135 degrees, the inclination angle is favorable for the dissolution of associated gas into the transported crude oil, part of undissolved associated gas also exists in the crude oil in a uniformly distributed small bubble state, and reinforcing rotary wings are arranged between the gas transmission central tube and the mixing tube, so that slight positive rotation flow state is formed in the crude oil transportation, the transported crude oil is always contacted with the inner wall of the mixing tube, and additional friction is reduced from flow states such as laminar flow, slip and slug flow caused by the mixing of the associated gas;
(2) According to the invention, the technical parameters such as pressure, flow and the like which can be met by oil transportation equipment, associated gas pressurizing equipment and a pipe network during oil and gas mixed transportation are met, under the permission of design and safety regulations, the technical requirements of the oil and gas mixed transportation of associated gas and multi-carrying gas are dissolved to the maximum extent, the crude oil carrying capacity is improved, the oil and gas mixed flow state is stable, the problem of pipe transportation flow state caused by mixing of associated gas into laminar flow, slipping, slug flow and the like is solved, the problem of greatly increasing the external transportation pressure caused by increasing the pipe transportation friction resistance is solved, the oil and gas mixed transportation efficiency is improved, the oil and gas mixed transportation pressure is reduced, and the oil and gas mixed transportation carrying capacity is increased;
(3) The oil-gas mixing device has the advantages of simple structure, practicability, convenience and strong practicability, and can be widely applied to various conditions requiring mixing.
Drawings
Fig. 1 is a schematic structural diagram of a mixing device for oil-gas mixing transportation of oilfield associated gas.
Reference numerals illustrate:
the device comprises a front-end oil inlet pipe, a rear-end oil outlet pipe, a 3-air inlet flange, a 4-air transmission central pipe, 5-air outlet holes, 6-reinforced rotors, 7-mixing pipes, 8-front-end oil inlet flanges and 9-rear-end oil outlet flanges.
Detailed Description
The following describes specific embodiments of the present invention with reference to examples:
it should be noted that the structures, proportions, sizes and the like illustrated in the present specification are used for being understood and read by those skilled in the art in combination with the disclosure of the present invention, and are not intended to limit the applicable limitations of the present invention, and any structural modifications, proportional changes or size adjustments should still fall within the scope of the disclosure of the present invention without affecting the efficacy and achievement of the present invention.
Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the invention, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the invention may be practiced.
Example 1
As shown in fig. 1, the invention discloses a mixing device for oil-gas mixing transportation of associated gas in an oilfield, which comprises a front oil inlet pipe 1, a rear oil outlet pipe 2, a gas transmission central pipe 4 and a mixing pipe 7, wherein the front oil inlet pipe 1 is connected with one end of the mixing pipe 7, the rear oil outlet pipe 2 is connected with the other end of the mixing pipe 7, the front oil inlet pipe 1, the rear oil outlet pipe 2 and the mixing pipe 7 are coaxial, one end of the gas transmission central pipe 4 penetrates through the mixing pipe 7 and is sleeved in the mixing pipe 7 in an annular space, a plurality of gas outlet holes 5 are formed in the gas transmission central pipe 4 sleeved in the mixing pipe 7, the size of the gas transmission central pipe 4 in the crude oil flowing direction is smaller than that of the mixing pipe 7, a gas-liquid mixing cavity is formed in the mixing pipe 7 and at the position of the gas transmission central pipe 4 close to the rear oil outlet pipe 2, one ends of the front oil inlet pipe 1 and the rear oil outlet pipe 2 far away from the mixing pipe 7 are respectively connected with a pressurizing pipeline, and the end of the gas transmission central pipe 4 located outside the mixing pipe 7 is connected with the associated gas transportation pipeline.
Example 2
As shown in fig. 1, the invention discloses a mixing device for oil-gas mixing transportation of associated gas in an oilfield, which comprises a front oil inlet pipe 1, a rear oil outlet pipe 2, a gas transmission central pipe 4 and a mixing pipe 7, wherein the front oil inlet pipe 1 is connected with one end of the mixing pipe 7, the rear oil outlet pipe 2 is connected with the other end of the mixing pipe 7, the front oil inlet pipe 1, the rear oil outlet pipe 2 and the mixing pipe 7 are coaxial, one end of the gas transmission central pipe 4 penetrates through the mixing pipe 7 and is sleeved in the mixing pipe 7 in an annular space, a plurality of gas outlet holes 5 are formed in the gas transmission central pipe 4 sleeved in the mixing pipe 7, the size of the gas transmission central pipe 4 in the crude oil flowing direction is smaller than that of the mixing pipe 7, a gas-liquid mixing cavity is formed in the mixing pipe 7 and at the position of the gas transmission central pipe 4 close to the rear oil outlet pipe 2, one ends of the front oil inlet pipe 1 and the rear oil outlet pipe 2 far away from the mixing pipe 7 are respectively connected with a pressurizing pipeline, and the end of the gas transmission central pipe 4 located outside the mixing pipe 7 is connected with the associated gas transportation pipeline.
Preferably, as shown in fig. 1, one end of the front oil inlet pipe 1, which is far away from the mixing pipe 7, is provided with a front oil inlet flange 8, one end of the rear oil outlet pipe 2, which is far away from the mixing pipe 7, is provided with a rear oil outlet flange 9, wherein the front oil inlet flange 8 and the rear oil outlet flange 9 are respectively connected with an oil delivery pipeline, and the end of the gas delivery central pipe 4, which is located outside the mixing pipe 7, is provided with an air inlet flange 3, and the air inlet flange 3 is connected with an associated gas pressurizing delivery pipeline.
Example 3
As shown in fig. 1, the invention discloses a mixing device for oil-gas mixing transportation of associated gas in an oilfield, which comprises a front oil inlet pipe 1, a rear oil outlet pipe 2, a gas transmission central pipe 4 and a mixing pipe 7, wherein the front oil inlet pipe 1 is connected with one end of the mixing pipe 7, the rear oil outlet pipe 2 is connected with the other end of the mixing pipe 7, the front oil inlet pipe 1, the rear oil outlet pipe 2 and the mixing pipe 7 are coaxial, one end of the gas transmission central pipe 4 penetrates through the mixing pipe 7 and is sleeved in the mixing pipe 7 in an annular space, a plurality of gas outlet holes 5 are formed in the gas transmission central pipe 4 sleeved in the mixing pipe 7, the size of the gas transmission central pipe 4 in the crude oil flowing direction is smaller than that of the mixing pipe 7, a gas-liquid mixing cavity is formed in the mixing pipe 7 and at the position of the gas transmission central pipe 4 close to the rear oil outlet pipe 2, one ends of the front oil inlet pipe 1 and the rear oil outlet pipe 2 far away from the mixing pipe 7 are respectively connected with a pressurizing pipeline, and the end of the gas transmission central pipe 4 located outside the mixing pipe 7 is connected with the associated gas transportation pipeline.
Preferably, as shown in fig. 1, one end of the front oil inlet pipe 1, which is far away from the mixing pipe 7, is provided with a front oil inlet flange 8, one end of the rear oil outlet pipe 2, which is far away from the mixing pipe 7, is provided with a rear oil outlet flange 9, wherein the front oil inlet flange 8 and the rear oil outlet flange 9 are respectively connected with an oil delivery pipeline, and the end of the gas delivery central pipe 4, which is located outside the mixing pipe 7, is provided with an air inlet flange 3, and the air inlet flange 3 is connected with an associated gas pressurizing delivery pipeline.
Preferably, gate valves are respectively arranged on the oil delivery pipelines connected with the front oil inlet flange 8 and the rear oil outlet flange 9, an oil delivery pump is arranged on the oil delivery pipeline connected with the front oil inlet flange 8 or the rear oil outlet flange 9, and a gas flowmeter and a gas regulating valve are sequentially arranged on the associated gas pressurizing and conveying pipeline connected with the air inlet flange 3 and used for recording and regulating the input quantity of associated gas.
Example 4
As shown in fig. 1, the invention discloses a mixing device for oil-gas mixing transportation of associated gas in an oilfield, which comprises a front oil inlet pipe 1, a rear oil outlet pipe 2, a gas transmission central pipe 4 and a mixing pipe 7, wherein the front oil inlet pipe 1 is connected with one end of the mixing pipe 7, the rear oil outlet pipe 2 is connected with the other end of the mixing pipe 7, the front oil inlet pipe 1, the rear oil outlet pipe 2 and the mixing pipe 7 are coaxial, one end of the gas transmission central pipe 4 penetrates through the mixing pipe 7 and is sleeved in the mixing pipe 7 in an annular space, a plurality of gas outlet holes 5 are formed in the gas transmission central pipe 4 sleeved in the mixing pipe 7, the size of the gas transmission central pipe 4 in the crude oil flowing direction is smaller than that of the mixing pipe 7, a gas-liquid mixing cavity is formed in the mixing pipe 7 and at the position of the gas transmission central pipe 4 close to the rear oil outlet pipe 2, one ends of the front oil inlet pipe 1 and the rear oil outlet pipe 2 far away from the mixing pipe 7 are respectively connected with a pressurizing pipeline, and the end of the gas transmission central pipe 4 located outside the mixing pipe 7 is connected with the associated gas transportation pipeline.
Preferably, as shown in fig. 1, one end of the front oil inlet pipe 1, which is far away from the mixing pipe 7, is provided with a front oil inlet flange 8, one end of the rear oil outlet pipe 2, which is far away from the mixing pipe 7, is provided with a rear oil outlet flange 9, wherein the front oil inlet flange 8 and the rear oil outlet flange 9 are respectively connected with an oil delivery pipeline, and the end of the gas delivery central pipe 4, which is located outside the mixing pipe 7, is provided with an air inlet flange 3, and the air inlet flange 3 is connected with an associated gas pressurizing delivery pipeline.
Preferably, gate valves are respectively arranged on the oil delivery pipelines connected with the front oil inlet flange 8 and the rear oil outlet flange 9, an oil delivery pump is arranged on the oil delivery pipeline connected with the front oil inlet flange 8 or the rear oil outlet flange 9, and a gas flowmeter and a gas regulating valve are sequentially arranged on the associated gas pressurizing and conveying pipeline connected with the air inlet flange 3 and used for recording and regulating the input quantity of associated gas.
Preferably, as shown in fig. 1, the gas transmission central tube 4 is connected by two connecting tubes intersecting at 90 ° in a penetrating manner, wherein one connecting tube is sleeved inside the mixing tube 7, the other connecting tube radially penetrates through the wall of the mixing tube 7 and is connected with a connecting tube arranged inside the mixing tube 7, and a plurality of gas outlet holes 5 are uniformly formed in the connecting tube arranged inside the mixing tube 7, wherein the connecting tube arranged inside the mixing tube 7 is coaxial with the mixing tube 7.
Example 5
As shown in fig. 1, the invention discloses a mixing device for oil-gas mixing transportation of associated gas in an oilfield, which comprises a front oil inlet pipe 1, a rear oil outlet pipe 2, a gas transmission central pipe 4 and a mixing pipe 7, wherein the front oil inlet pipe 1 is connected with one end of the mixing pipe 7, the rear oil outlet pipe 2 is connected with the other end of the mixing pipe 7, the front oil inlet pipe 1, the rear oil outlet pipe 2 and the mixing pipe 7 are coaxial, one end of the gas transmission central pipe 4 penetrates through the mixing pipe 7 and is sleeved in the mixing pipe 7 in an annular space, a plurality of gas outlet holes 5 are formed in the gas transmission central pipe 4 sleeved in the mixing pipe 7, the size of the gas transmission central pipe 4 in the crude oil flowing direction is smaller than that of the mixing pipe 7, a gas-liquid mixing cavity is formed in the mixing pipe 7 and at the position of the gas transmission central pipe 4 close to the rear oil outlet pipe 2, one ends of the front oil inlet pipe 1 and the rear oil outlet pipe 2 far away from the mixing pipe 7 are respectively connected with a pressurizing pipeline, and the end of the gas transmission central pipe 4 located outside the mixing pipe 7 is connected with the associated gas transportation pipeline.
Preferably, as shown in fig. 1, one end of the front oil inlet pipe 1, which is far away from the mixing pipe 7, is provided with a front oil inlet flange 8, one end of the rear oil outlet pipe 2, which is far away from the mixing pipe 7, is provided with a rear oil outlet flange 9, wherein the front oil inlet flange 8 and the rear oil outlet flange 9 are respectively connected with an oil delivery pipeline, and the end of the gas delivery central pipe 4, which is located outside the mixing pipe 7, is provided with an air inlet flange 3, and the air inlet flange 3 is connected with an associated gas pressurizing delivery pipeline.
Preferably, gate valves are respectively arranged on the oil delivery pipelines connected with the front oil inlet flange 8 and the rear oil outlet flange 9, an oil delivery pump is arranged on the oil delivery pipeline connected with the front oil inlet flange 8 or the rear oil outlet flange 9, and a gas flowmeter and a gas regulating valve are sequentially arranged on the associated gas pressurizing and conveying pipeline connected with the air inlet flange 3 and used for recording and regulating the input quantity of associated gas.
Preferably, as shown in fig. 1, the gas transmission central tube 4 is connected by two connecting tubes intersecting at 90 ° in a penetrating manner, wherein one connecting tube is sleeved inside the mixing tube 7, the other connecting tube radially penetrates through the wall of the mixing tube 7 and is connected with a connecting tube arranged inside the mixing tube 7, and a plurality of gas outlet holes 5 are uniformly formed in the connecting tube arranged inside the mixing tube 7, wherein the connecting tube arranged inside the mixing tube 7 is coaxial with the mixing tube 7.
Preferably, an inclination angle exists between the opening direction of the air outlet hole 5 and the flow direction of the crude oil, wherein the inclination angle is 90-135 degrees, the inclination angle is favorable for dissolving associated gas into the transported crude oil, and part of undissolved associated gas also exists in the crude oil in a uniformly distributed small bubble state.
Example 6
As shown in fig. 1, the invention discloses a mixing device for oil-gas mixing transportation of associated gas in an oilfield, which comprises a front oil inlet pipe 1, a rear oil outlet pipe 2, a gas transmission central pipe 4 and a mixing pipe 7, wherein the front oil inlet pipe 1 is connected with one end of the mixing pipe 7, the rear oil outlet pipe 2 is connected with the other end of the mixing pipe 7, the front oil inlet pipe 1, the rear oil outlet pipe 2 and the mixing pipe 7 are coaxial, one end of the gas transmission central pipe 4 penetrates through the mixing pipe 7 and is sleeved in the mixing pipe 7 in an annular space, a plurality of gas outlet holes 5 are formed in the gas transmission central pipe 4 sleeved in the mixing pipe 7, the size of the gas transmission central pipe 4 in the crude oil flowing direction is smaller than that of the mixing pipe 7, a gas-liquid mixing cavity is formed in the mixing pipe 7 and at the position of the gas transmission central pipe 4 close to the rear oil outlet pipe 2, one ends of the front oil inlet pipe 1 and the rear oil outlet pipe 2 far away from the mixing pipe 7 are respectively connected with a pressurizing pipeline, and the end of the gas transmission central pipe 4 located outside the mixing pipe 7 is connected with the associated gas transportation pipeline.
Preferably, as shown in fig. 1, one end of the front oil inlet pipe 1, which is far away from the mixing pipe 7, is provided with a front oil inlet flange 8, one end of the rear oil outlet pipe 2, which is far away from the mixing pipe 7, is provided with a rear oil outlet flange 9, wherein the front oil inlet flange 8 and the rear oil outlet flange 9 are respectively connected with an oil delivery pipeline, and the end of the gas delivery central pipe 4, which is located outside the mixing pipe 7, is provided with an air inlet flange 3, and the air inlet flange 3 is connected with an associated gas pressurizing delivery pipeline.
Preferably, gate valves are respectively arranged on the oil delivery pipelines connected with the front oil inlet flange 8 and the rear oil outlet flange 9, an oil delivery pump is arranged on the oil delivery pipeline connected with the front oil inlet flange 8 or the rear oil outlet flange 9, and a gas flowmeter and a gas regulating valve are sequentially arranged on the associated gas pressurizing and conveying pipeline connected with the air inlet flange 3 and used for recording and regulating the input quantity of associated gas.
Preferably, as shown in fig. 1, the gas transmission central tube 4 is connected by two connecting tubes intersecting at 90 ° in a penetrating manner, wherein one connecting tube is sleeved inside the mixing tube 7, the other connecting tube radially penetrates through the wall of the mixing tube 7 and is connected with a connecting tube arranged inside the mixing tube 7, and a plurality of gas outlet holes 5 are uniformly formed in the connecting tube arranged inside the mixing tube 7, wherein the connecting tube arranged inside the mixing tube 7 is coaxial with the mixing tube 7.
Preferably, an inclination angle exists between the opening direction of the air outlet hole 5 and the flow direction of the crude oil, wherein the inclination angle is 90-135 degrees, the inclination angle is favorable for dissolving associated gas into the transported crude oil, and part of undissolved associated gas also exists in the crude oil in a uniformly distributed small bubble state.
Preferably, as shown in fig. 1, the gas transmission central tube 4 is disposed between the outer wall of the connecting tube inside the mixing tube 7 and the inner wall of the mixing tube 7, and the reinforcing rotor 6 is welded between the outer wall of the connecting tube and the inner wall of the mixing tube 7 according to the forward rotation direction, so that crude oil forms a slight forward rotation flow state during the transportation, and the transported crude oil always contacts with the inner wall of the mixing tube 7, thereby slowing down the generation of additional friction caused by laminar flow, slipping and slugging caused by the mixing of associated gas.
Example 7
As shown in fig. 1, the invention discloses a mixing device for oil-gas mixing transportation of associated gas in an oilfield, which comprises a front oil inlet pipe 1, a rear oil outlet pipe 2, a gas transmission central pipe 4 and a mixing pipe 7, wherein the front oil inlet pipe 1 is connected with one end of the mixing pipe 7, the rear oil outlet pipe 2 is connected with the other end of the mixing pipe 7, the front oil inlet pipe 1, the rear oil outlet pipe 2 and the mixing pipe 7 are coaxial, one end of the gas transmission central pipe 4 penetrates through the mixing pipe 7 and is sleeved in the mixing pipe 7 in an annular space, a plurality of gas outlet holes 5 are formed in the gas transmission central pipe 4 sleeved in the mixing pipe 7, the size of the gas transmission central pipe 4 in the crude oil flowing direction is smaller than that of the mixing pipe 7, a gas-liquid mixing cavity is formed in the mixing pipe 7 and at the position of the gas transmission central pipe 4 close to the rear oil outlet pipe 2, one ends of the front oil inlet pipe 1 and the rear oil outlet pipe 2 far away from the mixing pipe 7 are respectively connected with a pressurizing pipeline, and the end of the gas transmission central pipe 4 located outside the mixing pipe 7 is connected with the associated gas transportation pipeline.
Preferably, as shown in fig. 1, one end of the front oil inlet pipe 1, which is far away from the mixing pipe 7, is provided with a front oil inlet flange 8, one end of the rear oil outlet pipe 2, which is far away from the mixing pipe 7, is provided with a rear oil outlet flange 9, wherein the front oil inlet flange 8 and the rear oil outlet flange 9 are respectively connected with an oil delivery pipeline, and the end of the gas delivery central pipe 4, which is located outside the mixing pipe 7, is provided with an air inlet flange 3, and the air inlet flange 3 is connected with an associated gas pressurizing delivery pipeline.
Preferably, gate valves are respectively arranged on the oil delivery pipelines connected with the front oil inlet flange 8 and the rear oil outlet flange 9, an oil delivery pump is arranged on the oil delivery pipeline connected with the front oil inlet flange 8 or the rear oil outlet flange 9, and a gas flowmeter and a gas regulating valve are sequentially arranged on the associated gas pressurizing and conveying pipeline connected with the air inlet flange 3 and used for recording and regulating the input quantity of associated gas.
Preferably, as shown in fig. 1, the gas transmission central tube 4 is connected by two connecting tubes intersecting at 90 ° in a penetrating manner, wherein one connecting tube is sleeved inside the mixing tube 7, the other connecting tube radially penetrates through the wall of the mixing tube 7 and is connected with a connecting tube arranged inside the mixing tube 7, and a plurality of gas outlet holes 5 are uniformly formed in the connecting tube arranged inside the mixing tube 7, wherein the connecting tube arranged inside the mixing tube 7 is coaxial with the mixing tube 7.
Preferably, an inclination angle exists between the opening direction of the air outlet hole 5 and the flow direction of the crude oil, wherein the inclination angle is 90-135 degrees, the inclination angle is favorable for dissolving associated gas into the transported crude oil, and part of undissolved associated gas also exists in the crude oil in a uniformly distributed small bubble state.
Preferably, as shown in fig. 1, the gas transmission central tube 4 is disposed between the outer wall of the connecting tube inside the mixing tube 7 and the inner wall of the mixing tube 7, and the reinforcing rotor 6 is welded between the outer wall of the connecting tube and the inner wall of the mixing tube 7 according to the forward rotation direction, so that crude oil forms a slight forward rotation flow state during the transportation, and the transported crude oil always contacts with the inner wall of the mixing tube 7, thereby slowing down the generation of additional friction caused by laminar flow, slipping and slugging caused by the mixing of associated gas.
Preferably, the gas transmission central tube 4 is arranged between the outer wall of the connecting tube inside the mixing tube 7 and the inner wall of the mixing tube 7, and three reinforcing rotary wings 6 are uniformly arranged on the circumference of the outer wall of the connecting tube, the included angle between the forward rotation direction and the crude oil flowing direction is a forward rotation angle, the forward rotation angle is the included angle between the central connecting line of the two sides of the reinforcing rotary wings 6 along the crude oil flowing direction and the crude oil flowing direction, and the forward rotation angle is 15-60 degrees.
Example 8
As shown in fig. 1, the invention discloses a mixing device for oil-gas mixing transportation of associated gas in an oilfield, which comprises a front oil inlet pipe 1, a rear oil outlet pipe 2, a gas transmission central pipe 4 and a mixing pipe 7, wherein the front oil inlet pipe 1 is connected with one end of the mixing pipe 7, the rear oil outlet pipe 2 is connected with the other end of the mixing pipe 7, the front oil inlet pipe 1, the rear oil outlet pipe 2 and the mixing pipe 7 are coaxial, one end of the gas transmission central pipe 4 penetrates through the mixing pipe 7 and is sleeved in the mixing pipe 7 in an annular space, a plurality of gas outlet holes 5 are formed in the gas transmission central pipe 4 sleeved in the mixing pipe 7, the size of the gas transmission central pipe 4 in the crude oil flowing direction is smaller than that of the mixing pipe 7, a gas-liquid mixing cavity is formed in the mixing pipe 7 and at the position of the gas transmission central pipe 4 close to the rear oil outlet pipe 2, one ends of the front oil inlet pipe 1 and the rear oil outlet pipe 2 far away from the mixing pipe 7 are respectively connected with a pressurizing pipeline, and the end of the gas transmission central pipe 4 located outside the mixing pipe 7 is connected with the associated gas transportation pipeline.
Preferably, as shown in fig. 1, one end of the front oil inlet pipe 1, which is far away from the mixing pipe 7, is provided with a front oil inlet flange 8, one end of the rear oil outlet pipe 2, which is far away from the mixing pipe 7, is provided with a rear oil outlet flange 9, wherein the front oil inlet flange 8 and the rear oil outlet flange 9 are respectively connected with an oil delivery pipeline, and the end of the gas delivery central pipe 4, which is located outside the mixing pipe 7, is provided with an air inlet flange 3, and the air inlet flange 3 is connected with an associated gas pressurizing delivery pipeline.
Preferably, gate valves are respectively arranged on the oil delivery pipelines connected with the front oil inlet flange 8 and the rear oil outlet flange 9, an oil delivery pump is arranged on the oil delivery pipeline connected with the front oil inlet flange 8 or the rear oil outlet flange 9, and a gas flowmeter and a gas regulating valve are sequentially arranged on the associated gas pressurizing and conveying pipeline connected with the air inlet flange 3 and used for recording and regulating the input quantity of associated gas.
Preferably, as shown in fig. 1, the gas transmission central tube 4 is connected by two connecting tubes intersecting at 90 ° in a penetrating manner, wherein one connecting tube is sleeved inside the mixing tube 7, the other connecting tube radially penetrates through the wall of the mixing tube 7 and is connected with a connecting tube arranged inside the mixing tube 7, and a plurality of gas outlet holes 5 are uniformly formed in the connecting tube arranged inside the mixing tube 7, wherein the connecting tube arranged inside the mixing tube 7 is coaxial with the mixing tube 7.
Preferably, an inclination angle exists between the opening direction of the air outlet hole 5 and the flow direction of the crude oil, wherein the inclination angle is 90-135 degrees, the inclination angle is favorable for dissolving associated gas into the transported crude oil, and part of undissolved associated gas also exists in the crude oil in a uniformly distributed small bubble state.
Preferably, as shown in fig. 1, the gas transmission central tube 4 is disposed between the outer wall of the connecting tube inside the mixing tube 7 and the inner wall of the mixing tube 7, and the reinforcing rotor 6 is welded between the outer wall of the connecting tube and the inner wall of the mixing tube 7 according to the forward rotation direction, so that crude oil forms a slight forward rotation flow state during the transportation, and the transported crude oil always contacts with the inner wall of the mixing tube 7, thereby slowing down the generation of additional friction caused by laminar flow, slipping and slugging caused by the mixing of associated gas.
Preferably, the gas transmission central tube 4 is arranged between the outer wall of the connecting tube inside the mixing tube 7 and the inner wall of the mixing tube 7, and three reinforcing rotary wings 6 are uniformly arranged on the circumference of the outer wall of the connecting tube, the included angle between the forward rotation direction and the crude oil flowing direction is a forward rotation angle, the forward rotation angle is the included angle between the central connecting line of the two sides of the reinforcing rotary wings 6 along the crude oil flowing direction and the crude oil flowing direction, and the forward rotation angle is 15-60 degrees.
Preferably, sealing rings are arranged at the joints of the front oil inlet pipe 1 and the mixing pipe 7, the rear oil outlet pipe 2 and the mixing pipe 7, and the joints of the gas transmission central pipe 4 and the mixing pipe 7.
Preferably, a mixing method of the mixing device for oilfield associated gas-oil gas mixing transmission according to any one of the above claims comprises the following steps:
step 1), the input end of a front oil inlet pipe 1 and the output end of a rear oil outlet pipe 2 are respectively connected with an oil pipeline in a horizontal state, the input end of a gas transmission central pipe 4 is connected with an associated gas pressurizing and conveying pipeline in a horizontal state, a gate valve is arranged at the connection position of the input end of the front oil inlet pipe 1 and the output end of the rear oil outlet pipe 2 and the oil pipeline, an oil pump is arranged, then a gas regulating valve is arranged at the connection position of the input end of the gas transmission central pipe 4 and the associated gas pressurizing and conveying pipeline, then a sealing ring is arranged at the connection position of the front oil inlet pipe 1, the rear oil outlet pipe 2, the gas transmission central pipe 4 and the mixing pipe 7, sealing performance is checked, and finally a bypass pipeline is integrally arranged in the mixing device;
step 2), sequentially opening gate valves at the front oil inlet pipe 1 and the rear oil outlet pipe 2, closing a bypass pipeline, and starting an oil delivery pump to deliver oil;
and 3) after the oil transportation parameters are stable, slowly opening a gas regulating valve to introduce associated gas, mixing the associated gas with crude oil after passing through gas outlet holes 5 uniformly distributed on a gas transportation central tube 4, generating slight positive rotation flow state after passing through a reinforcing rotor 6 arranged in a positive rotation direction, forming gas-carrying mixed liquid with high gas-oil ratio and gas-in-oil flow state, gradually regulating the gas quantity mixed with the associated gas according to the change of the pipe transportation pressure, fully mixing and dissolving the associated gas and the transported crude oil in a gas-liquid mixing cavity, and transporting the mixed gas and the transported crude oil to a downstream station.
The associated gas of the invention forms uniform continuous small bubbles through the gas outlet holes 5 of the gas transmission central tube 4, is fully mixed and dissolved with crude oil in the gas-liquid mixing cavity with increased volume, forms gas-carrying mixed liquid with high gas-oil ratio and gas-in-oil flow state, and is transmitted to a downstream station.
The crude oil flowing direction is the direction of crude oil flowing from the front oil inlet pipe 1 to the rear oil outlet pipe 2.
The front oil inlet pipe 1 and the rear oil outlet pipe 2 are cylindrical pipelines.
The air inlet flange 3, the front oil inlet flange 8 and the rear oil outlet flange 9 are flanges which can be used for pipeline connection in the prior art.
The aperture of the air outlet hole can be changed according to the mixing transmission requirement, and the shape of the air outlet hole can be round, elliptic and the like.
The reinforcing rotor wing is a flaky rotor wing, wherein the flaky rotor wing is arranged on the circumference of the end part of the gas transmission central tube according to the positive rotation direction.
The volume of the gas-liquid mixing cavity can be calculated and determined according to the size of the delivery associated gas, and the pressure grade of the mixing device is determined by referring to the design requirements of an oil transportation, pressurization and gas transmission process system.
The gas transmission central tube 4 of the mixing device is uniformly distributed and provided with the gas outlet holes 5 with a certain angle, the opening direction of the gas outlet holes 5 is vertical to or almost opposite to the flow direction of crude oil, the contact area and the mixing proportion of associated gas and crude oil can be increased, the conveying efficiency is improved, insufficient mixing at an oil-gas access point is prevented to a certain extent, gas slipping and slugging phenomena are formed, and meanwhile, the gas transmission central tube is cooperated with a gas regulating valve and a gas flowmeter of a gas transmission system to regulate the gas inflow and control the gas-oil ratio of oil-gas mixing transmission.
The working principle and working process of the invention are as follows:
as shown in fig. 1, a gas transmission central tube 4 is arranged in a mixing tube 7, so that the gas transmission central tube 4 is sleeved in the mixing tube 7 in an annular mode, a plurality of gas outlet holes 5 are formed in the gas transmission central tube 4, the hole opening direction of the gas outlet holes 5 and the flow direction of crude oil are inclined, the inclination angle is 90-135 degrees, the associated gas is dissolved into the transported crude oil, part of undissolved associated gas also exists in the crude oil in a uniformly distributed small bubble state, reinforcing rotary wings 6 are arranged between the gas transmission central tube and the mixing tube, slight positive rotation flow state is formed in the transportation of the crude oil, the transported crude oil is always contacted with the inner wall of the mixing tube 7, and additional friction resistance caused by flow states such as laminar flow, slipping, slug flow and the like caused by the mixing of the associated gas is relieved.
The working process comprises the steps of respectively connecting an input end of a front oil inlet pipe 1 and an output end of a rear oil outlet pipe 2 in a horizontal state with an oil delivery pipeline, connecting an input end of a gas delivery central pipe 4 with an associated gas pressurizing and delivering pipeline in a horizontal state, installing a gate valve at a joint of the input end of the front oil inlet pipe 1 and the output end of the rear oil outlet pipe 2 with the oil delivery pipeline, installing an oil delivery pump, installing a gas regulating valve at a joint of the input end of the gas delivery central pipe 4 and the associated gas pressurizing and delivering pipeline, arranging a sealing ring at a joint of the front oil inlet pipe 1, the rear oil outlet pipe 2, the gas delivery central pipe 4 and the mixing pipe 7, checking sealing performance, and finally arranging a bypass pipeline on the whole mixing device; sequentially opening gate valves at the front oil inlet pipe 1 and the rear oil outlet pipe 2, closing a bypass pipeline, starting an oil delivery pump to deliver oil, enabling crude oil to enter from an oil inlet of the front oil inlet pipe 1, and then outputting from an oil outlet of the rear oil outlet pipe 2 through a mixing pipe 7; after the oil transportation parameters are stable, the gas regulating valve is slowly opened to introduce associated gas, the associated gas enters through the gas inlet of the gas transportation central pipe 4, then the gas is mixed with crude oil after uniformly distributed gas outlet holes 5 on the gas transportation central pipe 4, the mixed liquid generates slight positive rotation flow state after passing through the reinforcing rotor 6 arranged in the positive rotation direction, gas-carrying mixed liquid with high gas-oil ratio and gas-in-oil flow state is formed, the gas quantity mixed into the associated gas is gradually regulated according to the change of the pipe transportation pressure, and the associated gas and the transported crude oil are fully mixed in the gas-liquid mixing cavity and dissolved and are transported to a downstream station.
In the conveying process, due to the change of crude oil density and the change of altitude difference along with the environment of a conveying tube side, the volume of a conveying medium is increased after associated gas is mixed, the conveying pressure is increased, the adjustment of associated gas quantity is required to follow the principle of gradual increase, the gas-oil ratio of the medium to be conveyed is relatively stable, and after all tube sides are filled, the conveying pressure of a system tube gradually tends to be stable. At this time, the mixing amount of the associated gas can be continuously and gradually adjusted according to the allowance of the technological parameters of the oil and gas transmission system, and the gas-oil ratio is improved until the system pressure and related parameters are stabilized again.
The invention satisfies the technical parameters of pressure, flow and the like which can be satisfied by oil transportation equipment, associated gas pressurizing equipment and a pipe network during oil and gas mixed transportation, and the technical requirements of the oil and gas mixed transportation of associated gas and multi-carrying gas are solved to the maximum extent under the permission of design and safety regulations, the oil and gas carrying capacity is improved, the oil and gas mixed flow state is stable, the problem of pipe transportation flow state caused by mixing of associated gas into laminar flow, slipping, slug flow and the like is solved, the problem of greatly increasing the external transportation pressure caused by increasing the pipe transportation friction resistance is solved, the oil and gas mixed transportation efficiency is improved, the oil and gas mixed transportation pressure is reduced, and the oil and gas mixed transportation carrying capacity is increased.
The oil-gas mixing device has the advantages of simple structure, practicability, convenience and strong practicability, and can be widely applied to various conditions requiring mixing.
While the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes may be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Many other changes and modifications may be made without departing from the spirit and scope of the invention. It is to be understood that the invention is not to be limited to the specific embodiments, but only by the scope of the appended claims.
Claims (5)
1. A mixing arrangement that is used for oil field associated gas oil gas to mix defeated, its characterized in that: the oil delivery system comprises a front oil inlet pipe (1), a rear oil outlet pipe (2), a gas delivery central pipe (4) and a mixing pipe (7), wherein the front oil inlet pipe (1) is connected with one end of the mixing pipe (7), the rear oil outlet pipe (2) is connected with the other end of the mixing pipe (7), the front oil inlet pipe (1), the rear oil outlet pipe (2) and the mixing pipe (7) are coaxial, one end of the gas delivery central pipe (4) penetrates through the mixing pipe (7) and is sleeved inside the mixing pipe (7) in an annular mode, a plurality of air outlet holes (5) are formed in the gas delivery central pipe (4) sleeved inside the mixing pipe (7), the size of the gas delivery central pipe (4) along the flow direction of crude oil is smaller than that of the mixing pipe (7), a gas-liquid mixing cavity is formed inside the mixing pipe (7) and at the position, close to the rear oil outlet pipe (2), one ends of the front oil inlet pipe (1) and the rear oil outlet pipe (2) are respectively connected with one end, far away from the mixing pipe (7), and the gas delivery central pipe (4) is connected with a pressurized gas delivery pipe (7);
the front oil inlet pipe (1) is provided with a front oil inlet flange (8) at one end far away from the mixing pipe (7), the rear oil outlet pipe (2) is provided with a rear oil outlet flange (9) at one end far away from the mixing pipe (7), the front oil inlet flange (8) and the rear oil outlet flange (9) are respectively connected with an oil pipeline, the end of the gas transmission central pipe (4) positioned outside the mixing pipe (7) is provided with an air inlet flange (3), and the air inlet flange (3) is connected with an associated gas pressurizing and conveying pipeline;
the opening direction of the air outlet hole (5) and the crude oil flowing direction have an inclination angle, wherein the inclination angle is 90-135 degrees, the inclination angle is favorable for the dissolution of associated gas into the conveyed crude oil, and part of undissolved associated gas also exists in the crude oil in a uniformly distributed small bubble state;
the gas transmission central tube (4) is arranged between the outer wall of the connecting tube in the mixing tube (7) and the inner wall of the mixing tube (7) and is provided with a reinforcing rotor wing (6);
the reinforcing rotor wing (6) is welded between the outer wall of the connecting pipe and the inner wall of the mixing pipe (7) according to the forward rotation direction, so that crude oil is slightly in a forward rotation flow state in the conveying process, the conveyed crude oil is always in contact with the inner wall of the mixing pipe (7), and the generation of additional friction caused by laminar flow, slipping and slugging due to the mixing of associated gas is slowed down;
the gas transmission central tube (4) is arranged between the outer wall of the connecting tube in the mixing tube (7) and the inner wall of the mixing tube (7), three reinforcing rotary wings (6) are uniformly arranged on the circumference of the outer wall of the connecting tube, the included angle between the forward rotation direction and the crude oil flowing direction is a forward rotation angle, the forward rotation angle is the included angle between the central connecting line of the two sides of the reinforcing rotary wings (6) along the crude oil flowing direction and the crude oil flowing direction, and the forward rotation angle is 15-60 degrees.
2. The mixing device for oilfield associated gas and oil gas mixed transportation according to claim 1, wherein: gate valves are respectively arranged on oil delivery pipelines connected with the front oil inlet flange (8) and the rear oil outlet flange (9), an oil delivery pump is arranged on the oil delivery pipeline connected with the front oil inlet flange (8) or the rear oil outlet flange (9), and a gas flowmeter and a gas regulating valve are sequentially arranged on associated gas pressurizing and conveying pipelines connected with the air inlet flange (3) and used for recording and regulating the input quantity of associated gas.
3. The mixing device for oilfield associated gas and oil gas mixed transportation according to claim 1, wherein: the gas transmission central tube (4) is connected through two connecting pipes which are 90 degrees in an intersecting way, one connecting pipe is sleeved inside the mixing pipe (7), the other connecting pipe radially penetrates through the wall of the mixing pipe (7) and is connected with the connecting pipe arranged inside the mixing pipe (7), and a plurality of gas outlet holes (5) are uniformly formed in the connecting pipe arranged inside the mixing pipe (7), and the connecting pipe arranged inside the mixing pipe (7) is coaxial with the mixing pipe (7).
4. The mixing device for oilfield associated gas and oil gas mixed transportation according to claim 1, wherein: sealing rings are arranged at the joints of the front oil inlet pipe (1) and the mixing pipe (7), the rear oil outlet pipe (2) and the mixing pipe (7) and the joints of the gas transmission central pipe (4) and the mixing pipe (7).
5. A mixing method of a mixing device for oilfield associated gas oil gas mixture transmission according to any one of claims 1 to 4, comprising the steps of:
the method comprises the steps of 1) respectively connecting an input end of a front oil inlet pipe (1) and an output end of a rear oil outlet pipe (2) in a horizontal state with an oil delivery pipeline, connecting an input end of a gas delivery central pipe (4) with an associated gas pressurizing and conveying pipeline in a horizontal state, installing a gate valve at a joint of the input end of the front oil inlet pipe (1) and the output end of the rear oil outlet pipe (2) with the oil delivery pipeline, installing an oil delivery pump, installing a gas regulating valve at a joint of the input end of the gas delivery central pipe (4) and the associated gas pressurizing and conveying pipeline, then arranging a sealing ring at a joint of the front oil inlet pipe (1), the rear oil outlet pipe (2), the gas delivery central pipe (4) and a mixing pipe (7), checking sealing performance, and finally arranging a bypass pipeline on the whole mixing device;
step 2), sequentially opening gate valves at the front oil inlet pipe (1) and the rear oil outlet pipe (2), closing a bypass pipeline, and starting an oil delivery pump to deliver oil;
and 3) after the oil transportation parameters are stable, slowly opening a gas regulating valve to introduce associated gas, mixing the associated gas with crude oil after passing through gas outlet holes (5) uniformly distributed on a gas transportation central tube (4), generating slight positive rotation flow state after passing through a reinforcing rotor wing (6) arranged in the positive rotation direction, forming gas-carrying mixed liquid with high gas-oil ratio and gas-in-oil flow state, gradually regulating the gas quantity mixed with the associated gas according to the change of the pipe transportation pressure, fully mixing and dissolving the associated gas and the transported crude oil in a gas-liquid mixing cavity, and transporting the mixed liquid to a downstream station.
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| CN112254557B (en) * | 2020-09-24 | 2022-04-22 | 万华化学集团股份有限公司 | Plate-shell type heat exchanger integrated with gas-liquid mixer and method and device system for treating organic wastewater by using plate-shell type heat exchanger |
| CN115069101B (en) * | 2021-03-12 | 2023-11-28 | 中国石油化工股份有限公司 | Gas-liquid mixer |
| CN113368716B (en) * | 2021-04-29 | 2022-08-16 | 中冶长天国际工程有限责任公司 | Air-oxygen mixer for oxygen-enriched ignition and control method thereof |
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