A kind of from flow-regulating type parallel shuntTechnical field
The present invention relates to the device improving Development Response of Oilfield, particularly a kind of from flow-regulating type parallel shunt.
Background technology
In long horizontal well, due to the impact of " heel end effect " and/or reservoir heterogeneity, the output of oil well in some position will far away higher than other positions, thus the uneven production profile produced may cause pit shaft at these position premature water breakthrough/gas.Once bore into, because the flowing of other positions is restricted, oil well output will significantly reduce.In order to eliminate this energy imbalance, common method has segmenting perforating and variable density perforation completion, central tube completion etc.But the ability of regulation and control of these methods to inflow profile is limited, be difficult to ensure that production profile is enough even.
The nineties in last century is early stage, and Norsk Hydro (Norway's Hydro) company have developed inflow control device (ICDs) at first, and is successfully applied to Troll oil field first in 1998.End 2013, in succession develop dissimilar ICDs both at home and abroad, passive type inflow control device (PICD) and self adaptation inflow control device (AICD) can be summarized as.Wherein, passive type inflow control device (PICD), is become a mandarin by equilibrium and delays to see water/gas, but, once water/gas bore mutually into, because its viscosity is lower, oil well will be taken completely, and suppress the flowing of oil phase, cause ICD to lose efficacy, reduce oil well output.Self adaptation inflow control device (AICD), once see water/gas, this device will automatically identify and enlarge markedly resistance, thus suppresses the flowing of water/gas phase, ensures oil well long term stable production.But existing AICD also also exists complex structure, the shortcomings such as applicability is not strong.
Summary of the invention
In order to solve the technical problem that in prior art, self adaptation inflow control device complex structure applicability is not strong.The invention provides a kind of from flow-regulating type parallel shunt, rely on self-regulated stream nozzle and parallel shunt, can open according to uninterrupted or blocking portion passage, simultaneously can also identify fluid type and automatically adjust its flow resistance by device according to fluid properties: before non-water breakthrough, device convection cell has certain resistance, the impact of heel end effect and reservoir heterogeneity can be offset, make along horizontal wellbore inflow profile even; Once generation water breakthrough, flow resistance will significantly increase, and the flowing of water exit interval is suppressed, thus ensure Oil/gas Well long term stable production.
The present invention is the technical scheme solving the employing of its technical problem: a kind of from flow-regulating type parallel shunt, comprises self-regulated flow nozzle, parallel shunt and current limiter; Self-regulated stream nozzle contains fixing jet pipe, movable spouts, spring and nozzle overcoat, is positioned at parallel shunt front end, and fluid enters parallel shunt by the outlet of nozzle overcoat.Parallel shunt contains current limliting pipeline and frictional resistance pipeline, and current limliting pipeline is the pipeline that area of passage dilation is arranged alternately, and frictional resistance pipeline is the bending pipeline arranged, and the outlet of current limliting pipeline is all communicated with current limiter with the outlet of frictional resistance pipeline; Liquid enters current limiter after can flowing through current limliting pipeline and frictional resistance pipeline and discharges from the outlet of current limiter.
Current limiter is cylindrical, and current limiter is arranged on the end of described parallel shunt.
Radial direction along current limiter after liquid can flow through current limliting pipeline enters in current limiter.
Tangentially enter in current limiter along current limiter after liquid can flow through frictional resistance pipeline.
The straight tube that the multiple area of passage alternating expansion of current limiting tube route shrinks connects to form.
Frictional resistance pipeline is connected to form by multiple bent sub and straight tube.
Movable spouts is positioned at fixing jet pipe, and can be free to slide, and movable spouts end is affixed on spring.
Spring is positioned at fixing jet pipe, connect movable spouts outlet with fix jet pipe fixed end and can free-extension.
Fixing jet pipe one end is positioned at outside nozzle overcoat, and fixed end is positioned at nozzle overcoat.
There is gap between fixing jet pipe in nozzle overcoat and nozzle overcoat, and on body, be uniformly distributed the through hole of certain size and quantity, through hole is communicated with movable spouts outlet and gap.
Gap between nozzle overcoat with fixing jet pipe is communicated with nozzle overcoat and exports, and the current limliting line entry of nozzle overcoat outlet parallel shunt hinders line entry with mill.
The invention has the beneficial effects as follows: one can be opened or blocking portion passage according to fluid flow size automatically from flow-regulating type parallel shunt, control fluid inflow velocity, the fluid properties flowed into is identified and shunted simultaneously, adjustment flow resistance.Before the non-water breakthrough of oil well, of the present invention have certain resistance from flow-regulating type parallel shunt convection cell, can offset the impact of heel end effect and reservoir heterogeneity, makes the inflow profile on horizontal wellbore enough even; Once generation water breakthrough, the present invention identifies automatically to the fluid flowing into current divider, the ratio of alter two parallel pipelines (current limliting pipeline and frictional resistance pipeline) in current limiter, adjust the mode that it enters current limiter, flow resistance is enlarged markedly, thus suppress the flowing of water exit interval, ensure Oil/gas Well long term stable production.Namely when before the non-water breakthrough of oil well, the little speed of fluid flow is slow, the automatic opened portion subchannel of self-regulated flow nozzle, accelerate fluid and enter parallel shunt, now be mainly oil phase by the fluid of parallel shunt, fluid tends to flow into current limliting pipeline, directly flows out from outlet after radially entering discoidal current limiter, flow channel length is shorter, and flow resistance is less; And when oil well water breakthrough, the large speed of fluid flow is fast, self-regulated flow nozzle is automatic blocking portion passage under fluid matasomatism, slowing down fluid enters parallel shunt, is now mainly aqueous phase by the fluid of parallel shunt, and fluid tends to flow into frictional resistance pipeline, tangentially enter discoidal current limiter, rotate for several times and flow out from outlet, flow channel length is longer, and flow resistance is larger.
Accompanying drawing explanation
Be described in further detail from flow-regulating type parallel shunt of the present invention below in conjunction with accompanying drawing.
Fig. 1 is this structural representation from flow-regulating type parallel shunt.
Wherein 1. self-regulated flow nozzles, 11. fixing jet pipes, 111. through holes, 112. fixed ends, 12. movable spouts, 121. movable spouts outlets, 13. springs, 14. nozzle overcoats, 141. gaps, 142. nozzle overcoat outlets, 2. parallel shunt, 21. current limliting pipelines, 211. current limliting line entry, 212. current limiting tube way outlets, 22. mill resistance pipelines, 221. mill resistance line entry, 222. mill resistance tube outlet, 3. current limiters, 31. outlets
Detailed description of the invention
Be described in further detail from flow-regulating type parallel shunt of the present invention below in conjunction with accompanying drawing.A kind of from flow-regulating type parallel shunt, comprise self-regulated stream nozzle 1, parallel shunt 2 and current limiter 3; Self-regulated stream nozzle contains fixing jet pipe 11, movable spouts 12, spring 13 and nozzle overcoat 14, is positioned at parallel shunt 2 front end, and fluid enters parallel shunt 2 by nozzle overcoat outlet 142;
Parallel current divider 2 is containing current limliting pipeline 21 and frictional resistance pipeline 22, the pipeline that current limliting pipeline 21 is arranged alternately for area of passage dilation, frictional resistance pipeline 22 is the bending pipeline arranged, the entrance 211 of current limliting pipeline all exports 142 with nozzle overcoat with the entrance 221 of frictional resistance pipeline and is communicated with, the outlet 212 of current limliting pipeline is all communicated with current limiter 3 with the outlet 222 of frictional resistance pipeline, the fluid entering self-regulated flow nozzle enters current limliting pipeline 21 and frictional resistance pipeline 22 by nozzle overcoat outlet 142, liquid enters current limiter 3 after can flowing through current limliting pipeline 21 and frictional resistance pipeline 22 and discharges from the outlet 31 of current limiter, as shown in Figure 1.
Described movable spouts 12 can be free to slide under the effect of fluid and spring 13 in fixing jet pipe 11, when the flow that fluid flows into movable spouts 12 changes, the active force of fluid matasomatism on movable spouts 12 changes thereupon, causes spring 13 to elongate or shorten to make movable spouts 12 be in dynamic equilibrium all the time.Meanwhile, the partial through holes 111 on fixing jet pipe 11 will be opened or block, and the area of passage in the gap 141 exported between 121 to nozzle housing 14 and fixing jet pipe 11 by movable spouts changes, thus controls the speed that fluid flows into self-regulated flow nozzle 1.
The pipeline that described current limliting pipeline 21 is shunk by a series of area of passage alternating expansion is in series, and as in Fig. 1, current limliting pipeline 21 resistance is mainly local head loss, and segments, the caliber of its drag size and pipeline are relevant.Described frictional resistance pipeline 22 extends length of pipe by the mode such as bent sub, pitch of the laps, and frictional resistance pipeline 22 is connected to form by multiple bent sub and straight tube, and its resistance is mainly frictional head loss, and drag size is relevant with the length of pipeline.The mode entering disc current limiter 3 according to fluid is different, and can produce different metering functions, the flow resistance size produced is relevant with the size of disc current limiter 3.This parallel shunt can, according to the difference of fluid properties, make fluid different with the flow resistance in frictional resistance pipeline 22 at current limliting pipeline 21, thus the ratio that automatic adjustment fluid is shunted in current limliting pipeline 21 and frictional resistance pipeline 22.
Operating principle of the present invention is by movable spouts 12 dynamic equilibrium control flow check rate of flow of fluid, when the flow that fluid flows into movable spouts 12 increases, the active force of fluid matasomatism on movable spouts 12 increases thereupon, the jet pipe 12 that innervates moves to the fixed end 112 of fixing jet pipe 11, spring 13 is compressed until movable spouts 12 is in equilibrium state again simultaneously, in the process of movable spouts 12 to fixed end 112 movement of fixing jet pipe 11, partial through holes 111 on fixing jet pipe 11 is by blocked, the area of passage in the gap 141 exported between 121 to nozzle overcoat 14 and fixing jet pipe 11 by movable spouts reduces, slow down the speed that fluid flows into self-regulated flow nozzle 1.When the flow that fluid flows into movable spouts 12 reduces, the active force of fluid matasomatism on movable spouts 12 reduces thereupon, movable spouts 12 moves to the direction away from fixing jet pipe fixed end 112 under the effect of spring 13, until be again in equilibrium state, at movable spouts 12 in the process away from fixing jet pipe fixed end 112 direction movement, passage portion 111 on fixing jet pipe 11 will be opened, the area of passage in the gap 141 exported between 121 to nozzle overcoat 14 and fixing jet pipe 11 by movable spouts increases, and facilitates the speed that fluid flows into self-regulated flow nozzle 1.
Meanwhile, for the fluid entering self-regulated flow nozzle 1, parallel shunt 2 is utilized to identify the fluid of heterogeneity (viscosity, density) and to produce different current limliting resistances.The outlet 212 of current limliting pipeline is towards the radial direction of current limiter 3, and the radial direction along current limiter 30 after liquid can flow through current limliting pipeline 21 enters in current limiter 3.Tangential towards current limiter 3 of the outlet 222 of frictional resistance pipeline, tangentially entering in current limiter 3 along current limiter 3 after liquid can flow through frictional resistance pipeline 22.The length of current limliting pipeline 21 is less than the length of frictional resistance pipeline 22.
Specifically, when the fluid that the less density of viscosity is larger passes through parallel shunt 2, fluid enters current limiter 3 after can flowing through current limliting pipeline 21 and frictional resistance pipeline 22, but the resistance of frictional resistance pipeline 22 to this fluid in parallel shunt 2 is less than the resistance of current limliting pipeline 21 to this fluid, so fluid is more prone to flow into frictional resistance pipeline 22, and produce high-speed rotational after tangentially entering disc current limiter 3, flow out rotating in current limiter 3 for several times from the outlet 31 of current limiter, be similar to and do the motion of the nearly heart, flow channel length is longer, and flow resistance is larger; When the fluid that viscosity greater density is less passes through parallel shunt 2, fluid enters current limiter 3 after can flowing through current limliting pipeline 21 and frictional resistance pipeline 22, but the resistance of frictional resistance pipeline 22 to this fluid in parallel shunt 2 is greater than the resistance of current limliting pipeline 21 to this fluid, so fluid is more prone to flow into current limliting pipeline 21, then after radially entering current limiter 3, the direct outlet 31 from current limiter is flowed out, now flow channel length is shorter, and flow resistance is less.