CN105569625A - Underground steam flow dryness distribution and regulation device - Google Patents
Underground steam flow dryness distribution and regulation device Download PDFInfo
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- CN105569625A CN105569625A CN201410643533.1A CN201410643533A CN105569625A CN 105569625 A CN105569625 A CN 105569625A CN 201410643533 A CN201410643533 A CN 201410643533A CN 105569625 A CN105569625 A CN 105569625A
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Abstract
The invention discloses an underground steam flow dryness distribution and regulation device, including an outer pipe, a flow adjusting device, and a nozzle flow pressure balance device. The internal of the outer pipe is provided with layering steam injection channels. The layering steam injection channels include a paratactic main channel and at least a side channel. The upper port of the main channel is provided with the nozzle flow pressure balance device. The internal of the side channel is provided with a flow adjusting device. The upper end inlet of the side channel is slantly communicated with the inner cavity of the outer pipe above the upper port of the main channel. A vapor stream rectifying device is installed in the inner cavity of the outer pipe and in front of branches of the layering steam injection channels. The device improves producing degree and development effect of a thick oil pay and a multilayered oil well, realizes rational distribution of steam dryness and flow among different oil layers, and provides technical guarantee for improving exploitation effect of heavy oil reservoir.
Description
Technical field
The present invention relates to down-hole regulation device in heavy crude heat extraction process, specifically underground steam flow mass dryness fraction distributes regulation device.
Background technology
Wherein general steam injection mining type occupies significant proportion, but arrive mid-later development phase, under multiple zone all opens the general steam injection condition of same well, current cyclic steam stimulation block major part is all in the later stage of handling up, and between each reservoir, contradiction is outstanding day by day, has a strong impact on the development degree of oil reservoir.China's heavy oil reserves is very abundant, Thermal Recovery For Viscous Oil By Steam is utilized to be a kind of important method of oil recovery by heating, flow and the mass dryness fraction of wherein injecting underground steam play a very important role with increasing economic efficiency oil well production increasing, especially concerning thick oil pay and multilayer system heavy crude reservoir, realize flow that each layer designs by reservoir geology personnel and mass dryness fraction injects each layer, to extending the production cycle of oil reservoir and improving recovery ratio all there is important practical significance.Current on-the-spot down-hole steam injection string adopts the mode of general steam injection substantially, accurate flow and mass dryness fraction regulation measure are not carried out to thick oil pay and oil reservoir with multiple series of strata, and carry out steam injection according to the non-homogeneity of oil reservoir self, if things go on like this, cause down-hole each interval to inhale vapour and oil production unbalanced, it is many that vapour is inhaled in the place of easy steam injection, and not easily the local steam injection of steam injection is few, thus have impact on the whole structure of steam injection, cause oil production to decline gradually.
Carry out laminated distributor under well steam injection flow mass dryness fraction for the problems referred to above and distribute control technique investigation.At present, the laminated distributor under well steam injection technology of domestic contrast maturation mainly adopts the method for layered quantitative gas filling, and adopt dispensing valve first note unit, after reaching gas injection rate, this steam injection passage is closed in pitching again, notes another unit.This technique achieves layered quantitative gas filling, but cannot realize carrying out steam distribution in separate layer to it in a steam injection simultaneously.In addition, also have and adopt the mode of steam distributing valve to limit steam flow, control the steam flow removing each layer, but the gas phase that its tubular column structure determines in moist steam preferentially enters steam distributing valve, cause steam quality increase with the degree of depth and reduce gradually, the mass dryness fraction such as cannot to realize and join vapour.
Summary of the invention
Underground steam flow mass dryness fraction is the object of the present invention is to provide to distribute regulation device, improve development degree and the development effectiveness of thick oil pay and multilayer system oil well, realize the reasonable distribution of steam quality, flow between different oil reservoir, for the exploitation effect improving heavy crude reservoir provides technology to ensure.
In order to reach above-mentioned purpose, present invention employs following technical scheme, underground steam flow mass dryness fraction distributes regulation device, comprise outer tube, flow adjuster, nozzle-type flow pressure bascule, described outer tube arranges layer steam injection passage, described layer steam injection passage is divided into a main channel arranged side by side and at least one side passage, the upper port of described main channel installs nozzle-type flow pressure bascule, described side channel interior installs flow adjuster, the oblique outer tube bore be communicated to above the upper port of main channel of upper end entrance of described side passage.
In described outer tube bore steam flow pattern fairing is installed before being positioned at layer steam injection channel branch.
Described steam flow pattern fairing is in the form of annular discs, and offers and be evenly equipped with multiple through hole.
Obconic centre bore is offered at described nozzle-type flow pressure bascule center.
Described flow adjuster comprises shell, streamlined float, standard orifice plate, described outer casing inner wall installation code orifice plate, and streamlined float is installed at the center of standard orifice plate, and described shell bottom outer wall is arranged on the lower end outlet inside wall of side passage by screw thread.
The upper and lower of described streamlined float is provided with the straightening support being fixed on outer casing inner wall, be respectively front straightening support, rear straightening support, the center of described front straightening support is connected to the upper surface of streamlined float, arrange support spring between described rear straightening support and the lower surface of streamlined float, flow channels is offered at described straightening support center.
Enclose seal by sealing o between described outer shell outer wall and side vias inner walls.
Described outer tube upper end is oil pipe top connection link, offers internal thread, and described outer tube lower end is oil pipe lower contact link, offers external screw thread.
Compared to prior art, the present invention has following beneficial effect:
The present invention is according to the characteristic of steam-water two-phase fluid, utilize the steam flow pattern fairing of the porous type evenly gathered that downhole wet steam is rectified into dispersed stream, ensure that the water droplet in steam is distributed in gas phase, uniformly for subsequent control layer steam injection mass dryness fraction deviation provides precondition.Then Stress control difference exported by nozzle-type flow pressure bascule at the same pressure, eliminate the impact that between two outlets, different back pressure causes flow and mass dryness fraction, then a part of fluid carries out layer steam injection passage one, and another part enters layer steam injection passage two.In layer steam injection passage one, flow control device is installed, ensure that the steam flow entering this layer is entered by the numerical value of steam-water two phase flow theory model calculation of steam flow rate calculation according to reservoir engineering personnel, also ensure that entering next stage distributes the steam flow of passage and the numerical value of mass dryness fraction is undertaken by design simultaneously.Improve development degree and the development effectiveness of thick oil pay and multilayer system oil well, realize the reasonable distribution of steam quality, flow between different oil reservoir, for the exploitation effect improving heavy crude reservoir provides technology to ensure.
Flow rate adjustable scope 0t/h-18t/h; 2, pressure 0-30MPa; 3, temperature 374 DEG C; 4, regulate and control error and be less than 8%.
Accompanying drawing explanation
Fig. 1 is the structural representation that underground steam flow mass dryness fraction distributes regulation device;
Fig. 2 is the structural representation of flow adjuster in Fig. 1.
In figure, 1, oil pipe top connection link; 2, steam flow pattern fairing; 3, first layer steam injection feeder connection; 4, nozzle-type flow pressure bascule; 5, flow adjuster; 6, first layer steam injection channel outlet; 7, the second layer steam injection passage; 8, oil pipe lower contact link;
501, flow adjuster shell; 502, front straightening support; 503, streamlined float; 504, standard orifice plate; 505, support spring; 506, rear straightening support; 507, lower thread sealed end; 508, o circle is sealed.
Detailed description of the invention
Detailed description for the present invention and technology contents, coordinate accompanying drawing to be described as follows, but accompanying drawing only provides with reference to the use with explanation, is not used for being limited the present invention.
According to Fig. 1-2, underground steam flow mass dryness fraction distributes regulation device, comprise outer tube, flow adjuster 5, nozzle-type flow pressure bascule 4, described outer tube arranges layer steam injection passage, described layer steam injection passage is divided into a main channel (implementing the second layer steam injection passage 7 in illustration) arranged side by side and at least one side passage, the upper port of described main channel installs nozzle-type flow pressure bascule 4, described side channel interior installs flow adjuster 5, upper end entrance (implementing the first layer steam injection feeder connection 3 in illustration) the oblique outer tube bore be communicated to above the upper port of main channel of described side passage.In outer tube bore steam flow pattern fairing 2 is installed before being positioned at layer steam injection channel branch.Described steam flow pattern fairing is in the form of annular discs, and offers and be evenly equipped with multiple through hole.Obconic centre bore is offered at described nozzle-type flow pressure bascule 4 center.
Flow adjuster comprises shell 501, streamlined float 503, standard orifice plate 504, described outer casing inner wall installation code orifice plate, streamlined float is installed at the center of standard orifice plate, and described shell bottom outer wall is arranged on lower end outlet (implementing the first layer steam injection channel outlet 6 in the illustration) inwall of side passage by screw thread.The upper and lower of described streamlined float is provided with the straightening support being fixed on outer casing inner wall, be respectively front straightening support 502, rear straightening support 506, the center of described front straightening support is connected to the upper surface of streamlined float, arrange support spring 505 between described rear straightening support and the lower surface of streamlined float, flow channels is offered at described straightening support center.Enclose 508 seal by sealing o between described outer shell outer wall and side vias inner walls.
Outer tube upper end is oil pipe top connection link 1, offers internal thread, and described outer tube lower end is oil pipe lower contact link 8, offers external screw thread.
Outer tube upper end arranges the steam flow pattern fairing 2 of densely covered uniform bore, connect two layer steam injection passages independently below, first ensure that the mass dryness fraction entering above two passages is substantially identical, then ensure the distribution regulation and control of each laminar flow amount of first layer steam injection passage and the second layer steam injection passage according to design.Then install nozzle-type flow pressure bascule 4 in the second layer steam injection passage, final second layer steam injection passage finally coordinates layer separating packer etc. to ensure two-layer steam distribution by the oil pipe lower contact link 8 of lower end.
In addition, the steam flows of more than three layers, mass dryness fraction are distributed to regulation and control between mounting layer, can be reconnected above underground steam flow mass dryness fraction regulation device after separator, and under realizing multiple zone well, steam flow mass dryness fraction distributes regulation and control.
The present invention is according to the characteristic of steam-water two-phase fluid, utilize the steam flow pattern fairing of the porous type evenly gathered that downhole wet steam is rectified into dispersed stream, ensure that the water droplet in steam is distributed in gas phase, uniformly for subsequent control layer steam injection mass dryness fraction deviation provides precondition.Then Stress control difference exported by nozzle-type flow pressure bascule at the same pressure, eliminate the impact that between two outlets, different back pressure causes flow and mass dryness fraction, then a part of fluid carries out layer steam injection passage one, and another part enters layer steam injection passage two.In layer steam injection passage one, flow control device is installed, ensure that the steam flow entering this layer is entered by the numerical value of steam-water two phase flow theory model calculation of steam flow rate calculation according to reservoir engineering personnel, also ensure that entering next stage distributes the steam flow of passage and the numerical value of mass dryness fraction is undertaken by design simultaneously.In addition, the flow control device in hierarchical channel two may also be the differential pressure type such as orifice plate, nozzle flow throttle control device.
Steam jet flow in hierarchical channel one is calculated as follows:
In formula:
The weight flow of W---fluid, kg/h;
C---nozzle orifice coeficient, by Re and do/D value;
Do---nozzle minimum-value aperture, m;
D---internal diameter of the pipeline, m;
P1---pressure before nozzle, Pa;
P2---pressure or critical limit flowing pressure after nozzle, gets its large one, Pa;
M---molecular weight;
Z---compression coefficient, looks into gas compressibility factor figure according to fluid reduced pressure (Pr) reduced temperature Tr and asks for;
T---fluid temperature (F.T.) before nozzle, K;
K---specific heat ratio, k=Cp/Cv;
CP---fluid specific heat at constant pressure, kJ/ (kgK);
CV---fluid specific heat at constant volume, kJ/ (kgK).
Adjustable steam flow in hierarchical channel two is calculated as follows:
According to fluid mechanics principle, fluid can be represented by the formula through the flow of throttling arrangement and the relation of two ends pressure reduction:
In formula: Q
m---mass flow; A---circulation area; C---discharge coefficient;
ρ---fluid density; Δ P---the pressure reduction at throttling arrangement two ends.
C, ρ in formula are considered as constant, when actual internal area A remains unchanged, and Q
mbe directly proportional to the square root of Δ P, when throttling arrangement two ends pressure reduction changes, in runner, flow changes thereupon.
The foregoing is only preferred embodiment of the present invention, be not used to limit the scope of the claims of the present invention, other use the equivalence of patent spirit of the present invention to change, and all should all belong to the scope of the claims of the present invention.
Claims (8)
1. underground steam flow mass dryness fraction distributes regulation device, it is characterized in that, comprise outer tube, flow adjuster, nozzle-type flow pressure bascule, described outer tube arranges layer steam injection passage, described layer steam injection passage is divided into a main channel arranged side by side and at least one side passage, the upper port of described main channel installs nozzle-type flow pressure bascule, described side channel interior installs flow adjuster, the oblique outer tube bore be communicated to above the upper port of main channel of upper end entrance of described side passage.
2. underground steam flow mass dryness fraction according to claim 1 distributes regulation device, it is characterized in that, is provided with steam flow pattern fairing in described outer tube bore before being positioned at layer steam injection channel branch.
3. underground steam flow mass dryness fraction according to claim 2 distributes regulation device, and it is characterized in that, described steam flow pattern fairing is in the form of annular discs, and offers and be evenly equipped with multiple through hole.
4. underground steam flow mass dryness fraction according to claim 1 distributes regulation device, and it is characterized in that, obconic centre bore is offered at described nozzle-type flow pressure bascule center.
5. underground steam flow mass dryness fraction according to claim 1 distributes regulation device, it is characterized in that, described flow adjuster comprises shell, streamlined float, standard orifice plate, described outer casing inner wall installation code orifice plate, streamlined float is installed at the center of standard orifice plate, and described shell bottom outer wall is arranged on the lower end outlet inside wall of side passage by screw thread.
6. underground steam flow mass dryness fraction according to claim 5 distributes regulation device, it is characterized in that, the upper and lower of described streamlined float is provided with the straightening support being fixed on outer casing inner wall, be respectively front straightening support, rear straightening support, the center of described front straightening support is connected to the upper surface of streamlined float, arrange support spring between described rear straightening support and the lower surface of streamlined float, flow channels is offered at described straightening support center.
7. underground steam flow mass dryness fraction according to claim 5 distributes regulation device, it is characterized in that, encloses and seals between described outer shell outer wall and side vias inner walls by sealing o.
8. underground steam flow mass dryness fraction according to claim 1 distributes regulation device, and it is characterized in that, described outer tube upper end is oil pipe top connection link, offers internal thread, and described outer tube lower end is oil pipe lower contact link, offers external screw thread.
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| CN107570331A (en) * | 2016-06-30 | 2018-01-12 | 山保工业株式会社 | Liquid dispensing nozzle |
| CN107780906A (en) * | 2017-10-27 | 2018-03-09 | 长江大学 | The constant flow water filling jet pipe for principle of being jammed based on machinery |
| CN110984935A (en) * | 2019-12-12 | 2020-04-10 | 中国石油化工股份有限公司 | Intelligent steam regulation and control device for oil field ground steam injection pipe network |
| CN114427413A (en) * | 2020-10-09 | 2022-05-03 | 中国石油化工股份有限公司 | Equal-flow equal-dryness steam distributor |
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| CN107780906B (en) * | 2017-10-27 | 2024-05-28 | 长江大学 | Constant flow water injection nozzle based on mechanical choking principle |
| CN110984935A (en) * | 2019-12-12 | 2020-04-10 | 中国石油化工股份有限公司 | Intelligent steam regulation and control device for oil field ground steam injection pipe network |
| CN114427413A (en) * | 2020-10-09 | 2022-05-03 | 中国石油化工股份有限公司 | Equal-flow equal-dryness steam distributor |
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| CN105569625B (en) | 2018-03-16 |
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