CN110984935A - Intelligent steam regulation and control device for oil field ground steam injection pipe network - Google Patents
Intelligent steam regulation and control device for oil field ground steam injection pipe network Download PDFInfo
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- CN110984935A CN110984935A CN201911273698.3A CN201911273698A CN110984935A CN 110984935 A CN110984935 A CN 110984935A CN 201911273698 A CN201911273698 A CN 201911273698A CN 110984935 A CN110984935 A CN 110984935A
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- 238000010793 Steam injection (oil industry) Methods 0.000 title claims abstract description 63
- 238000005192 partition Methods 0.000 claims abstract description 31
- 230000001105 regulatory effect Effects 0.000 claims abstract description 15
- 238000000926 separation method Methods 0.000 claims abstract description 14
- 238000007789 sealing Methods 0.000 claims description 21
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 238000009826 distribution Methods 0.000 abstract description 12
- 238000011084 recovery Methods 0.000 abstract description 5
- 238000011161 development Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 238000011156 evaluation Methods 0.000 abstract description 2
- 230000002349 favourable effect Effects 0.000 abstract description 2
- 238000005457 optimization Methods 0.000 abstract description 2
- 239000012071 phase Substances 0.000 description 15
- 239000003921 oil Substances 0.000 description 14
- 239000012530 fluid Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 5
- 238000005191 phase separation Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000003129 oil well Substances 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 230000001133 acceleration Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 238000007726 management method Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000003326 Quality management system Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000013523 data management Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004401 flow injection analysis Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 230000005514 two-phase flow Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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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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- Mining & Mineral Resources (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Pipeline Systems (AREA)
Abstract
The invention provides an intelligent steam regulating device for a steam injection pipe network on the ground of an oil field, wherein a rectifier is embedded in a steam injection pipeline, and a separation regulator is welded on the steam injection pipeline; a fixed partition plate is welded on the inner wall of the body A, a connecting shaft is connected with a movable partition plate, the movable partition plate is welded on a movable rod, a main branch outlet is communicated with a steam injection pipeline, one end of a branch cavity is blocked, a side branch outlet is communicated with a branch pipeline, and a flow regulator is welded on the branch pipeline; a gear sliding strip is arranged at the bottom of the body B and connected with the stepping motor, a support rod is arranged in the body B, a fixed floater is arranged on the support rod, and a nozzle is welded in the body B; has the advantages that: the invention improves the distribution capacity of the steam enthalpy value of the ground steam injection pipe network, realizes equal dryness constant flow steam distribution of different pressures by combining the critical flow principle of the nozzle, creates favorable conditions for the optimization of the thick oil steam injection thermal recovery process, the effective utilization of energy and the evaluation of steam injection effect, and provides a new technical support for the thick oil thermal recovery steam injection development.
Description
Technical Field
The invention relates to the field of thickened oil thermal recovery in the development process of the petroleum industry, in particular to an intelligent steam regulating and controlling device for a ground steam injection pipe network of an oil field.
Background
The world thick oil reserves are abundant, steam injection exploitation is an important method for thick oil development, in the process of conveying steam to a steam injection well in an oil field, the steam can form different flow patterns in a pipeline, the different flow patterns have phase separation phenomena in the flowing process of a steam injection pipe network, and a plurality of problems are brought to the distribution of the dryness and the flow of the steam injection.
Each steam injection well of the heavy oil field is generally supplied with steam from a main line through each branch line, the connection point of the main line and the branch lines adopts a straight tee joint, and the two outlets of the tee joint are asymmetric relative to the inlet in structure, so that the dryness of the steam before and after distribution is seriously uneven, and the overall effect of block steam injection is influenced.
T-shaped tee joints are common pipe network components and are involved in almost all pipe network conveying systems. When the two-phase steam-water flow passes through the T-shaped tee joint, liquid and gas can select respective preferential paths, and the dryness of 2 branch pipes (side branch pipes and straight branch pipes) can be obviously different, which is called as a drift phenomenon or phase separation. The research on the phase separation of the steam-water two-phase flow at the T-shaped part begins in the fields of oil exploitation and nuclear power generation. When thick oil is exploited, high-temperature and high-pressure steam in the main pipeline is conveyed to each oil well through a pipe network for steam injection. In practice, it is often found that some steam injection well heads have high steam dryness, while other steam injection well heads almost all have high-temperature hot water, and the energy reaching each oil well has great difference. Finally, the steam injection efficiency and the crude oil production of the whole oil well production zone are greatly reduced.
The tee is the simplest distributing element applied to a fluid conveying pipeline, the tee can be arranged to be horizontal or vertical as required, and the side branch can be arranged at various angles. The two-phase fluid is distributed through the three-way pipe in a very complex condition, so that the flow distribution problem is involved, and the two-phase distribution problem is also involved, so that the prediction result error of the method is very large, the phase distribution of the T-shaped three-way two-phase fluid is often inconsistent, the steam-water ratio of the outlets of the two branch pipes is obviously different, and the phenomenon is called three-way pipe phase separation phenomenon.
The outlet of the steam injection boiler is wet steam with the dryness x less than or equal to 80 percent, the wet steam is a two-phase mixture of saturated water and saturated steam, and the steam flow in the steam conveying pipeline belongs to steam-liquid two-phase pipe flow. The two-phase pipe flow and the single-phase pipe flow (pure gas phase or pure liquid phase flow) have the same point, and the pressure change is caused by friction resistance, gravity and flow velocity change; there are also differences, i.e. the calculation methods of these pressure changes are different, and the single-phase pipe flow only distinguishes laminar flow, turbulent flow and transitional flow; and independent of the orientation of the tube placement, the direction of flow; the flow pattern of the two-phase tube flow is complex and related to the tube orientation, flow direction.
The ground steam transmission pipeline from the outlet of the boiler to the wellhead of the steam injection well has small change in height, so that no gravity pressure difference is generated; the flow rate is unchanged, the density is not changed greatly, so the acceleration change is small, and the obvious acceleration differential pressure is not generated; therefore, when the energy flow parameters of the ground steam pipeline are calculated according to different operating conditions, only the pressure difference caused by friction resistance can be calculated, and the pressure is smaller and smaller from the outlet of the boiler to the inlet of the steam injection well due to the steam pressure. This is an analysis from a momentum perspective. From the energy point of view, the ground steam transmission pipeline is externally provided with an insulating layer, but still has certain heat loss which is not negligible, and the dryness of the steam is changed, so that the proportion of gas phase and liquid phase is influenced, and the friction pressure difference is changed by the heat loss.
In summary, the oil field pipe network itself is composed of a plurality of complex straight pipes and three-way distributors, and under the existing pipe network structure, how to upgrade and reform the original steam injection pipe network, phase separation is reduced, and the distribution of the steam injection flow of each branch according to the design is ensured while the dryness of the injected steam of each branch is the same.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides an intelligent steam regulating and controlling device for an oil field ground steam injection pipe network.
The new technical scheme of the invention is as follows: an intelligent steam regulating device for an oil field ground steam injection pipe network comprises a wireless receiving and sending system, a flow regulator, a steam injection pipeline, a rectifier, a separation regulator, a regulating system, a flow sensing system and branch pipelines, wherein the intelligent regulating device is T-shaped, the rectifier is embedded in the steam injection pipeline, and the separation regulator is welded on the steam injection pipeline behind the rectifier; the separation regulator comprises a fixed clapboard, a movable clapboard, a side branch outlet, a movable rod, a sealing gasket, a sealing cavity, a connecting shaft, a main branch outlet and a body A, wherein the upper part in the body A is provided with the sealing cavity, the sealing gasket is arranged in the sealing cavity, the inner wall of the body A is welded on one side of the fixed clapboard, the other side of the fixed clapboard is welded on the connecting shaft, the connecting shaft is connected with one side of the movable clapboard, the other side of the movable clapboard is welded on one end of the movable rod, the movable rod extends out of the body A, the other end of the movable rod is connected with a stepping motor, the stepping motor is controlled by a regulation and control system, the large sector formed by the surrounding of the fixed clapboard and the movable clapboard is the main branch outlet, the main branch outlet is communicated with a steam injection pipeline, and the small sector formed by the fixed, one end of the branch cavity is blocked, a side branch outlet is arranged on the wall A of the body corresponding to the branch cavity, the side branch outlet is communicated with the branch pipeline, and a flow regulator is welded on the branch pipeline; the flow regulator comprises a body B, a stepping motor, a gear sliding strip, a supporting rod, a fixed floater and a nozzle, wherein the gear sliding strip is arranged at the bottom of the body B and connected with the stepping motor, the stepping motor is controlled by a regulating system, the supporting rod is arranged in the middle of the inside of the body B, the fixed floater is arranged on the supporting rod, and the nozzle is welded in the body B; and the branch pipeline is provided with a wireless receiving and sending system and a flow sensing system.
The rectifier is in a rotational flow phase splitting mode.
The inner sealing gasket of the separation regulator is a graphite gasket.
The nozzle is a Venturi nozzle.
The nozzle is horn-shaped.
The invention has the beneficial effects that: the invention improves the distribution capacity of the steam enthalpy value of the ground steam injection pipe network, realizes equal dryness constant flow steam distribution of different pressures by combining the critical flow principle of the nozzle, creates favorable conditions for the optimization of the thick oil steam injection thermal recovery process, the effective utilization of energy and the evaluation of steam injection effect, and provides a new technical support for the thick oil thermal recovery steam injection development.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic view of the partition regulator.
Fig. 3 is a schematic structural diagram of a flow regulator.
Fig. 4 is a schematic structural diagram of a rectifier.
Wherein: 1 is a wireless receiving and sending system, 2 is a flow regulator, 201 is a body B, 202 is a stepping motor, 203 is a gear sliding strip, 204 is a supporting rod, 205 is a fixed floater, 206 is a nozzle, 3 is a steam injection pipeline, 4 is a rectifier, 5 is a separation regulator, 501 is a fixed clapboard, 502 is a movable clapboard, 503 is a side branch outlet, 504 is a movable rod, 505 is a sealing gasket, 506 is a sealing cavity, 507 is a connecting shaft, 508 is a main branch outlet, 509 is a body A, 6 is a regulating and controlling system, 7 is a flow sensing system, and 8 is a branch pipeline.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
An intelligent steam regulating device for an oil field ground steam injection pipe network comprises a wireless receiving and sending system 1, a flow regulator 2, a steam injection pipeline 3, a rectifier 4, a separation regulator 5, a regulating and controlling system 6, a flow sensing system 7 and a branch pipeline 8, wherein the intelligent regulating and controlling device is T-shaped, the rectifier 4 is embedded in the steam injection pipeline 3, and the separation regulator 5 is welded on the steam injection pipeline 3 behind the rectifier 4; the separation adjuster 5 comprises a fixed partition plate 501, a movable partition plate 502, a side branch outlet 503, a movable rod 504, a sealing gasket 505, a sealing cavity 506, a connecting shaft 507, a main branch outlet 508 and a body A509, wherein the upper part in the body A509 is provided with the sealing cavity 506, the sealing gasket 505 is arranged in the sealing cavity 506, the inner wall of the body A509 is welded at one side of the fixed partition plate 501, the other side of the fixed partition plate 501 is welded on the connecting shaft 507, the connecting shaft 507 is connected at one side of the movable partition plate 502, the other side of the movable partition plate 502 is welded at one end of the movable rod 504, the movable rod 504 extends out of the body A509, the other end of the movable rod 504 is connected with a stepping motor, the stepping motor is controlled by a regulating system 6, the large sector formed by the fixed partition plate 501 and the movable partition plate 502 is the main branch outlet 508, and the main branch outlet 508, a small fan shape enclosed by the fixed partition plate 501 and the movable partition plate 502 is a branch cavity, one end of the branch cavity is blocked, a side branch outlet 503 is arranged on the wall of the body A509 corresponding to the branch cavity, the side branch outlet 503 is communicated with a branch pipeline 8, and a flow regulator 2 is welded on the branch pipeline 8; the flow regulator 2 comprises a body B201, a stepping motor 202, a gear sliding bar 203, a support rod 204, a fixed floater 205 and a nozzle 206, wherein the gear sliding bar 203 is arranged at the bottom of the body B201, the gear sliding bar 203 is connected with the stepping motor 202, the stepping motor 202 is controlled by a regulation and control system 6, the support rod 204 is arranged in the middle of the body B201, the fixed floater 205 is arranged on the support rod 204, and the nozzle 206 is welded in the body B201; the branch pipeline 8 is provided with a wireless receiving and sending system 1 and a flow sensing system 7.
The rectifier 4 is a cyclone phase splitting.
The internal sealing gasket 505 of the separation adjuster 5 is a graphite gasket.
The nozzle 206 is a venturi nozzle.
The nozzle 206 is flared.
Wet saturated steam (dryness is 70-99%) generated by the steam injection boiler enters a rectifier 4 through a steam injection pipeline 3, the rectifier 4 arranges steam flow patterns, water with high density in the steam is pushed to the inner wall of the pipeline by utilizing the centrifugal force principle, and dry steam with low density is gathered at the center of the pipeline to form standard annular flow. The uniform annular flow after being rectified by the rectifier 4 is subjected to tube internal packing and distribution, the rectified fluid enters a fixed partition plate 501 and a movable partition plate 502, wherein the fixed partition plate 501 and the movable partition plate 502 are connected through a connecting shaft 507, the fixed area formed by the movable partition plate 502 and the fixed partition plate 501 is distributed according to the designed flow, the fluid enters a side branch outlet 503, the rest part of the fluid enters a main branch outlet 508, and the steam entering the main branch outlet 508 enters the downstream. If the flow of each branch changes, the movable partition plate 502 is dragged by the stepping motor to divide the area again when needing to be adjusted, so as to meet the designed steam injection flow; the flow pattern finished by the rectifier 4 is a steam flow pattern based on axial symmetry in the pipe, and the steam can be sealed and distributed by adopting the area segmentation principle, so that the steam can enter the separation regulator 5 to distribute the steam flow according to the steam of each branch steam injection well, and the steam dryness in the outlet of the steam injection pipeline 3 and the branch pipeline 8 is equal because the steam is in an axial symmetry structure in the sealing process. Meanwhile, in order to overcome the influence of pressure difference of each branch steam injection well on steam flow distribution, a flow regulating device is adopted to control the pressure difference of the branch wells, and the critical flow principle is adopted to realize constant flow injection; steam entering the side branch outlet 503 enters the flow regulator 2, the fixed float 205 is supported by the support rod 204, and the flow area is controlled according to the designed flow, the flow area of the venturi nozzle 206 meets the critical flow principle, if the flow of each branch steam injection well changes, the flow area of the venturi nozzle 206 is regulated by the gear sliding strip 203 and the stepping motor 202, and the influence of the pressure difference of each downstream steam injection well on the upstream flow and the flow pattern is isolated, and the steam enters the branch pipeline 8 through the venturi nozzle 206 and then enters the steam injection well.
In order to reasonably regulate and control the flow of each branch steam injection well according to the flow of the steam injection boiler, the steam equal-dryness fixed-flow intelligent regulation and control device is provided with a flow sensing system 7, a regulation and control system 6 and a wireless receiving and sending system 1, wherein the wireless receiving and sending system 1 receives and sends flow data collected by the flow sensing system 7 and controls and regulates the flow of each branch steam injection well through the regulation and control system 6. The collected signals are communicated with a wireless main network through the wireless receiving and sending system 1, the signals transmitted in two directions are input into the data management system for classification management, are transmitted into the steam injection flow quality management system through the data transmission line for centralized management and regulation, and send instructions to the wireless receiving and sending system 1 in a reverse direction for intelligent regulation.
Claims (5)
1. The utility model provides an oil field ground steam injection pipe network steam intelligent control device, includes that wireless receiving and dispatching system (1), flow regulator (2), steam injection pipeline (3), rectifier (4), separate regulator (5), regulation and control system (6), flow sensing system (7) and lateral conduit (8), its characterized in that: the intelligent control device is T-shaped, a rectifier (4) is embedded in the steam injection pipeline (3), and a separation regulator (5) is welded on the steam injection pipeline (3) behind the rectifier (4); the separation regulator (5) comprises a fixed partition plate (501), a movable partition plate (502), a side branch outlet (503), a movable rod (504), a sealing gasket (505), a sealing cavity (506), a connecting shaft (507), a main branch outlet (508) and a body A (509), wherein the upper part in the body A (509) is provided with the sealing cavity (506), the sealing gasket (505) is arranged in the sealing cavity (506), the inner wall of the body A (509) is welded at one side of the fixed partition plate (501), the other side of the fixed partition plate (501) is welded on the connecting shaft (507), the connecting shaft (507) is connected at one side of the movable partition plate (502), the other side of the movable partition plate (502) is welded at one end of the movable rod (504), the movable rod (504) extends out of the body A (509), the other end of the movable rod (504) is connected with a stepping motor, and the stepping motor is controlled by a regulation and control system (6), the large sector surrounded by the fixed partition plate (501) and the movable partition plate (502) is a main branch outlet (508), the main branch outlet (508) is communicated with the steam injection pipeline (3), the small sector surrounded by the fixed partition plate (501) and the movable partition plate (502) is a branch cavity, one end of the branch cavity is blocked, a side branch outlet (503) is arranged on the wall of the body A (509) corresponding to the branch cavity, the side branch outlet (503) is communicated with the branch pipeline (8), and the branch pipeline (8) is welded with a flow regulator (2); the flow regulator (2) comprises a body B (201), a stepping motor (202), a gear sliding bar (203), a support rod (204), a fixed floater (205) and a nozzle (206), wherein the gear sliding bar (203) is arranged at the bottom of the body B (201), the gear sliding bar (203) is connected with the stepping motor (202), the stepping motor (202) is controlled by a regulating system (6), the support rod (204) is arranged in the middle of the body B (201), the fixed floater (205) is arranged on the support rod (204), and the nozzle (206) is welded in the body B (201); the branch pipeline (8) is provided with a wireless receiving and sending system (1) and a flow sensing system (7).
2. The intelligent regulation and control device for steam of the steam injection pipe network on the ground of the oil field according to claim 1, characterized in that: the rectifier (4) is in a rotational flow phase splitting mode.
3. The intelligent regulation and control device for steam of the steam injection pipe network on the ground of the oil field according to claim 1, characterized in that: the inner sealing gasket (505) of the separation regulator (5) is a graphite gasket.
4. The intelligent regulation and control device for steam of the steam injection pipe network on the ground of the oil field according to claim 1, characterized in that: the nozzle (206) is a venturi nozzle.
5. The intelligent regulation and control device for steam of the steam injection pipe network on the ground of the oil field according to claim 1 or 4, characterized in that: the nozzle (206) is in a horn shape.
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| CN201911273698.3A CN110984935A (en) | 2019-12-12 | 2019-12-12 | Intelligent steam regulation and control device for oil field ground steam injection pipe network |
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| CN201911273698.3A CN110984935A (en) | 2019-12-12 | 2019-12-12 | Intelligent steam regulation and control device for oil field ground steam injection pipe network |
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