技术领域technical field
本发明是关于一种在井内分离井中所产物质的装置，尤其涉及一种井下油水分离器及分离系统。The invention relates to a device for separating produced substances in a well, in particular to a downhole oil-water separator and a separation system.
背景技术Background technique
随着油田开采时间的增长，产出液中含水率逐年增加，为此需要耗费大量人力物力对产出液进行分离处理，并将处理后的水回注到注水层，这使得油井经济效益显著降低。井下油水分离系统是指将油水分离器直接安装在井底，分离出产液中的绝大部分水并直接回注到注水层，而只将富油液体举升到地表，大幅减小地面产出液处理量，降低原油生产费用，并减少地面污水排放量。With the increase of oilfield production time, the water content in the produced fluid increases year by year. Therefore, it takes a lot of manpower and material resources to separate the produced fluid and inject the treated water back into the water injection layer, which makes the economic benefits of the oil well significant. reduce. The downhole oil-water separation system refers to installing the oil-water separator directly at the bottom of the well, separating most of the water in the production fluid and directly re-injecting it into the water injection layer, while only lifting the oil-rich liquid to the surface, greatly reducing the surface output Liquid treatment capacity, reduce crude oil production costs, and reduce ground sewage discharge.
目前，有两种井下油水分离技术得到广泛利用，分别为重力分离器和水力旋流器。重力分离器利用油水密度不同引起的重力差异进行分离，重质相的水下沉，而轻质相的油漂浮在水层上，从而实现油水的分离；水力旋流器则利用油水在高速旋转流场的离心力差异实现分离，重质相的水被甩向边壁，螺旋向下运动并从底流口流出，而轻质相的油则在旋流器中心轴附近形成油核，从上部的溢流口流出，从而达到油水分离的目的。At present, two downhole oil-water separation technologies are widely used, namely gravity separator and hydrocyclone. The gravity separator uses the gravity difference caused by the different density of oil and water to separate, the water in the heavy phase sinks, and the oil in the light phase floats on the water layer, so as to realize the separation of oil and water; the hydrocyclone uses oil and water to rotate at a high speed The centrifugal force difference in the flow field realizes separation, the water in the heavy phase is thrown towards the side wall, spirals downward and flows out from the bottom outlet, while the oil in the light phase forms an oil nucleus near the central axis of the cyclone, and flows from the upper The overflow port flows out, so as to achieve the purpose of oil-water separation.
然而，在有限的井筒空间内，这两种井下油水分离器均存在较大局限性，主要表现为重力分离器体积大、分离效果差、分离效率低，水力旋流器附加压降过大、处理量低，这限制了井下油水分离技术在稠油油藏、深水开发以及高温高压环境的使用和推广。However, in the limited wellbore space, these two kinds of downhole oil-water separators have great limitations, mainly manifested in the large volume of the gravity separator, poor separation effect, low separation efficiency, excessive additional pressure drop of the hydrocyclone, The processing capacity is low, which limits the use and promotion of downhole oil-water separation technology in heavy oil reservoirs, deep-water development, and high-temperature and high-pressure environments.
由此，本发明人凭借多年从事相关行业的经验与实践，提出一种井下油水分离器及分离系统，以克服现有技术的缺陷。Therefore, relying on years of experience and practice in related industries, the inventor proposes an downhole oil-water separator and a separation system to overcome the defects of the prior art.
发明内容Contents of the invention
本发明的目的在于提供一种井下油水分离器及分离系统，能自动识别流体类型，使不同类型的流体沿不同的管路流动，从而调整井下采出液的流量和含水率；油水分离效率高，处理量大。The purpose of the present invention is to provide a downhole oil-water separator and separation system, which can automatically identify the type of fluid, so that different types of fluid flow along different pipelines, thereby adjusting the flow rate and water content of the downhole production fluid; the oil-water separation efficiency is high , a large amount of processing.
本发明的目的是这样实现的，一种井下油水分离器，所述井下油水分离器包括：The object of the present invention is achieved like this, a kind of downhole oil-water separator, described downhole oil-water separator comprises:
分离器进液口，井下采出液从所述分离器进液口进入该井下油水分离器内部；The liquid inlet of the separator, the downhole production fluid enters the interior of the downhole oil-water separator from the liquid inlet of the separator;
限流管路，所述限流管路的下端与所述分离器进液口连通，所述限流管路的上端向上延伸并形成限流管路出口；所述限流管路的内部形成供液体流动的过流通道，所述过流通道包括多个交替设置的大截面段和小截面段，所述大截面段的过流面积大于所述小截面段的过流面积；A flow-limiting pipeline, the lower end of the flow-limiting pipeline communicates with the liquid inlet of the separator, and the upper end of the flow-limiting pipeline extends upwards to form a flow-limiting pipeline outlet; the inside of the flow-limiting pipeline forms An overflow channel for liquid to flow, the overflow channel includes a plurality of alternately arranged large section sections and small section sections, the flow area of the large section section is larger than the flow area of the small section section;
摩阻管路，所述摩阻管路的下端与所述分离器进液口连通，所述摩阻管路的上端向上延伸并形成摩阻管路出口；所述摩阻管路内部的过流面积均相同；所述摩阻管路与所述限流管路并列设置，所述摩阻管路的长度大于所述限流管路的长度。A friction pipeline, the lower end of the friction pipeline communicates with the liquid inlet of the separator, and the upper end of the friction pipeline extends upwards to form a friction pipeline outlet; The flow areas are all the same; the friction pipeline and the flow limiting pipeline are arranged side by side, and the length of the friction pipeline is greater than the length of the flow limiting pipeline.
在本发明的一较佳实施方式中，所述限流管路沿直线向上延伸；所述摩阻管路弯曲盘绕向上延伸；所述限流管路出口与所述摩阻管路出口位于同一高度。In a preferred embodiment of the present invention, the flow-limiting pipeline extends upwards in a straight line; the friction pipeline extends upwards in a curved coil; the outlet of the flow-limiting pipeline and the outlet of the friction pipeline are located at the same high.
在本发明的一较佳实施方式中，所述限流管路由多段大直径钢管和多段小直径钢管交替连接构成；所述大直径钢管的内径大于所述小直径钢管的内径；所述摩阻管路由弯曲钢管构成。In a preferred embodiment of the present invention, the flow-limiting pipeline is composed of multiple sections of large-diameter steel pipes and multiple sections of small-diameter steel pipes alternately connected; the inner diameter of the large-diameter steel pipes is larger than the inner diameter of the small-diameter steel pipes; the friction The piping consists of bent steel pipes.
在本发明的一较佳实施方式中，所述井下油水分离器的下部还设有一缓冲腔，所述分离器进液口位于所述缓冲腔的下端，所述限流管路的下端和所述摩阻管路的下端均与所述缓冲腔连通。In a preferred embodiment of the present invention, the lower part of the downhole oil-water separator is also provided with a buffer chamber, the liquid inlet of the separator is located at the lower end of the buffer chamber, the lower end of the flow-limiting pipeline and the The lower ends of the friction pipelines are all in communication with the buffer chamber.
本发明的目的还可以这样实现，一种采用所述井下油水分离器的分离系统，所述分离系统包括顶部封隔器、筛管、隔离封隔器和油水分离管柱；所述顶部封隔器设置在所述筛管的上端，所述隔离封隔器设置在所述筛管的中部；所述顶部封隔器与所述隔离封隔器之间为注水层，所述隔离封隔器的下方为产液层；The purpose of the present invention can also be achieved in this way, a separation system using the downhole oil-water separator, the separation system includes a top packer, a screen pipe, an isolation packer and an oil-water separation string; the top packer The top packer is set on the upper end of the screen, and the isolation packer is set in the middle of the screen; between the top packer and the isolation packer is a water injection layer, and the isolation packer Below is the fluid-producing layer;
所述油水分离管柱包括所述井下油水分离器、插入密封装置和油管，所述插入密封装置通过所述油管连接在所述井下油水分离器的下方，所述插入密封装置与所述隔离封隔器密封插接配合；所述摩阻管路出口与所述注水层连通；所述限流管路出口连通到地表。The oil-water separation string includes the downhole oil-water separator, an insertion sealing device and an oil pipe, the insertion sealing device is connected below the downhole oil-water separator through the oil pipe, and the insertion sealing device is connected to the isolation seal The spacer is sealed and plugged in; the outlet of the friction pipeline is connected to the water injection layer; the outlet of the flow-limiting pipeline is connected to the surface.
在本发明的一较佳实施方式中，所述井下油水分离器与所述插入密封装置之间设有下部灌装泵。In a preferred embodiment of the present invention, a lower filling pump is provided between the downhole oil-water separator and the insertion sealing device.
在本发明的一较佳实施方式中，所述井下油水分离器的上方设有上部灌装泵。In a preferred embodiment of the present invention, an upper filling pump is arranged above the downhole oil-water separator.
在本发明的一较佳实施方式中，所述上部灌装泵与所述井下油水分离器之间设有封隔器。In a preferred embodiment of the present invention, a packer is provided between the upper filling pump and the downhole oil-water separator.
在本发明的一较佳实施方式中，所述插入密封装置的下端连接带孔管。In a preferred embodiment of the present invention, the lower end of the insertion sealing device is connected with a perforated tube.
在本发明的一较佳实施方式中，所述分离系统内形成有产出液流入通道、富油液体举升通道和低含油液体回注通道；In a preferred embodiment of the present invention, the separation system is formed with a production fluid inflow channel, an oil-rich liquid lifting channel and a low oil-containing liquid reinjection channel;
所述产出液流入通道将所述分离器进液口与所述产液层连通；所述富油液体举升通道将所述限流管路的下端与地表连通；所述低含油液体回注通道将所述摩阻管路的下端与所述注水层连通。The production fluid inflow channel connects the liquid inlet of the separator with the liquid production layer; the oil-rich liquid lifting channel communicates the lower end of the flow-restricting pipeline with the surface; the low oil-containing liquid returns The injection channel connects the lower end of the friction pipeline with the water injection layer.
由上所述，该井下油水分离器的限流管路内具有大小交替设置的过流面积，以局部阻力损失为主；摩阻管路的内部具有均匀的过流面积，且长度大于限流管路的长度，以沿程阻力损失为主。当油水两相混合流体进入该井下油水分离器后，油水将自动分离并进入不同的管路，粘度较高的油相主要流入以局部阻力损失为主的限流管路，并沿油管举升到地表；粘度较低的水相主要流入以沿程阻力损失为主的摩阻管路，并回注到注水层，从而实现对油水两相混合流体的分离，油水分离效率高，处理量大。From the above, the flow-limiting pipeline of the downhole oil-water separator has flow-flow areas arranged alternately in size, mainly local resistance loss; the inside of the friction-resistance pipeline has a uniform flow-flow area, and the length is greater than the flow-limiting area. The length of the pipeline is mainly based on the resistance loss along the way. When the oil-water two-phase mixed fluid enters the downhole oil-water separator, the oil and water will automatically separate and enter different pipelines. The oil phase with higher viscosity mainly flows into the flow-limited pipeline mainly due to local resistance loss, and is lifted along the oil pipeline. to the surface; the water phase with low viscosity mainly flows into the friction pipeline mainly due to the resistance loss along the way, and is reinjected into the water injection layer, so as to realize the separation of the oil-water two-phase mixed fluid, with high oil-water separation efficiency and large processing capacity .
附图说明Description of drawings
以下附图仅旨在于对本发明做示意性说明和解释，并不限定本发明的范围。The following drawings are only intended to illustrate and explain the present invention schematically, and do not limit the scope of the present invention.
其中：in:
图1：为本发明井下油水分离器的结构示意图。Fig. 1: is the structure diagram of downhole oil-water separator of the present invention.
图2：为本发明井下油水分离系统的结构示意图。Fig. 2: It is a structural schematic diagram of the downhole oil-water separation system of the present invention.
1.上部罐装泵，1. Upper tank pump,
2.封隔器，2. Packer,
3.井下油水分离器，31.分离器进液口，3. Downhole oil-water separator, 31. Separator liquid inlet,
4.下部罐装泵，4. Lower canned pump,
5.油管，5. Tubing,
6.顶部封隔器，6. Top packer,
7.筛管，7. Sieve tube,
8.隔离封隔器，8. Isolation packer,
9.插入密封装置，9. Insert the seal,
10.带孔管，10. Perforated tube,
11.限流管路，111.限流管路入口，112.限流管路出口，11. flow-limiting pipeline, 111. flow-limiting pipeline inlet, 112. flow-limiting pipeline outlet,
12.摩阻管路，121.摩阻管路入口，122.摩阻管路出口，12. friction pipeline, 121. friction pipeline inlet, 122. friction pipeline outlet,
131.大直径钢管，132.小直径钢管，133.直管段，131. Large diameter steel pipe, 132. Small diameter steel pipe, 133. Straight pipe section,
14.弯曲管段，14. Bending pipe sections,
A.产出液流入通道，A. Production fluid inflow channels,
B.富油液体举升通道，B. Oil-rich liquid lift channel,
C.低含油液体回注通道，C. Low oil content liquid return channel,
W.注水层，W. water injection layer,
P.产液层。P. The sap-producing layer.
具体实施方式detailed description
为了对本发明的技术特征、目的和效果有更加清楚的理解，现对照附图说明本发明的具体实施方式。In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described with reference to the accompanying drawings.
实施例一Embodiment one
如图1所示，本发明提供了一种井下油水分离器3，包括分离器进液口31、限流管路11和摩阻管路12。分离器进液口31设在井下油水分离器3的下端，井下采出液从所述分离器进液口31进入该井下油水分离器3内部。限流管路的下端(限流管路入口111)和摩阻管路的下端(摩阻管路入口121)均与所述分离器进液口31连通，所述摩阻管路12与所述限流管路11并列设置。所述限流管路的上端向上延伸并形成限流管路出口112，富油液体从限流管路出口112流出并经过举升到达地表。所述限流管路11的内部形成供液体流动的过流通道，所述过流通道包括多个交替设置的大截面段和小截面段，所述大截面段的过流面积大于所述小截面段的过流面积。因此，限流管路11内以局部摩擦阻力损失(局部阻力损失)为主，局部摩擦阻力是指流体的边界在局部地区发生急剧变化时，迫使主流脱离边壁而形成漩涡，流体质点间产生剧烈的碰撞所形成的阻力。限流管路11内的过流面积变化多，故局部摩擦阻力损失大。所述摩阻管路的上端向上延伸并形成摩阻管路出口122，低含油液体从摩阻管路出口122流出，流到井下油水分离器3的外部。所述摩阻管路12内部的过流面积均相同；所述摩阻管路12的长度大于所述限流管路11的长度。因此，摩阻管路12内以沿程阻力损失为主，沿程阻力是流体流经一定管径的管路时，由于流体内摩擦力而产生的阻力，阻力的大小与流动路程长度成正比。由于摩阻管路12的路程长度长，故沿程阻力损失大。As shown in FIG. 1 , the present invention provides a downhole oil-water separator 3 , which includes a separator liquid inlet 31 , a flow-limiting pipeline 11 and a friction pipeline 12 . The liquid inlet 31 of the separator is arranged at the lower end of the downhole oil-water separator 3 , and the downhole production fluid enters the inside of the downhole oil-water separator 3 through the liquid inlet 31 of the separator. The lower end of the flow-limiting pipeline (the flow-limiting pipeline inlet 111) and the lower end of the friction pipeline (the friction pipeline inlet 121) are all communicated with the liquid inlet 31 of the separator, and the friction pipeline 12 is connected to the The flow-limiting pipelines 11 are arranged side by side. The upper end of the flow-limiting pipeline extends upwards to form a flow-limiting pipeline outlet 112 , and the oil-rich liquid flows out from the flow-limiting pipeline outlet 112 and is lifted to the surface. The inside of the flow-restricting pipeline 11 forms an overflow channel for liquid flow, and the overflow channel includes a plurality of alternately arranged large cross-section sections and small cross-section sections, and the flow area of the large cross-section section is larger than that of the small cross-section sections. The flow area of the cross section. Therefore, the local frictional resistance loss (local resistance loss) is the main factor in the flow-limiting pipeline 11. The local frictional resistance means that when the boundary of the fluid changes sharply in a local area, the main flow is forced to break away from the side wall to form a vortex, and the flow between the fluid particles occurs. The resistance formed by violent collisions. The flow area in the flow-limiting pipeline 11 varies a lot, so the loss of local frictional resistance is large. The upper end of the friction pipeline extends upwards to form a friction pipeline outlet 122 , and the low oil-containing liquid flows out from the friction pipeline outlet 122 to the outside of the downhole oil-water separator 3 . The flow areas inside the friction pipelines 12 are all the same; the length of the friction pipelines 12 is greater than the length of the flow limiting pipeline 11 . Therefore, in the friction pipeline 12, the loss along the path is the main factor. The along-path resistance is the resistance caused by the internal friction of the fluid when the fluid flows through a pipeline with a certain diameter. The magnitude of the resistance is proportional to the length of the flow path. . Due to the long path length of the friction pipeline 12, the resistance loss along the path is large.
当产液层P产出的流体(油水混合相)流经井下油水分离器3之前，油水两相尚未分离，具有相同压力，当限流管路出口112与摩阻管路出口122处压力相等时，亦即驱动两相流体运动的压差相等时，油水两相流体将会自动向可以减少压力损耗的流道流动，根据流体力学公式，由于油相流体粘度较大，密度较小，其流动压力损耗主要来自沿程摩擦阻力，又因为摩阻管路12流道长，对流体的沿程阻力损失大，即限流管路11对油相流体的阻力小于摩阻管路12对该流体的阻力，故油相液体更倾向于流向限流管路11；而水相粘度低，密度大，其流动压力损耗主要来自局部摩阻损失，限流管路11由于过流面积变化较多，对流体的局部阻力损失大，即摩阻管路12对水相流体的阻力小于限流管路11对该流体的阻力，故水相液体更倾向于流向摩阻管路12。When the fluid (oil-water mixed phase) produced by the liquid-producing layer P flows through the downhole oil-water separator 3, the oil-water two phases have not been separated and have the same pressure. , that is, when the pressure difference driving the movement of the two-phase fluid is equal, the oil-water two-phase fluid will automatically flow to the flow channel that can reduce the pressure loss. According to the fluid mechanics formula, since the oil phase fluid has a higher viscosity and a lower density, its The pressure loss mainly comes from the friction resistance along the way, and because the friction pipeline 12 has a long flow path, the resistance loss to the fluid along the way is large, that is, the resistance of the flow limiting pipeline 11 to the oil phase fluid is smaller than that of the friction pipeline 12 to the fluid. Therefore, the oil phase liquid tends to flow to the flow-limiting pipeline 11; while the water phase has low viscosity and high density, and its flow pressure loss mainly comes from local friction loss, and the flow-limiting pipeline 11 has more changes in the flow area. The local resistance loss to the fluid is large, that is, the resistance of the friction pipeline 12 to the water-phase fluid is smaller than the resistance of the flow-limiting pipeline 11 to the fluid, so the water-phase liquid tends to flow to the friction pipeline 12 .
在本实施例中，限流管路11沿直线向上延伸，可以由多段大直径钢管131和多段小直径钢管132交替连接构成；所述大直径钢管131的内径大于所述小直径钢管132的内径；也可以采用一根直钢管，而直钢管内具有大小交替设置的不同内径段。其阻力主要为局部水头损失，阻力大小与管路的分段数、管径有关。所述摩阻管路12采用弯曲盘绕方式向上延伸来延长管路长度，采用该设置方式的原因和目的为：由于两点之间的直线距离最短，限流管路11是沿直线向上延伸的，因此为了使所述摩阻管路12的长度大于所述限流管路11的长度，所采用的弯曲盘绕方式是指向上延伸的路径除了直线以外的任何其它方式，可以是曲线，也可以是曲线与直线相组合的形式，也可以是折线形式向上延伸。当采用曲线时可以螺旋向上盘绕，也可以是S形向上盘绕。具体实施时可以由弯曲钢管构成；也可以采用多个直管段133与多个弯曲管段14连接组成，所述摩阻管路12的长度为限流管路11长度的数倍。其阻力主要为沿程水头损失，阻力大小与管路的长度有关。所述限流管路出口112与所述摩阻管路出口122位于同一高度，限流管路出口112朝上便于与油管5或其它零件串接，摩阻管路出口122朝向井下油水分离器3的一侧，便于低含油液体流出井下油水分离器3进入注水层W，限流管路11和摩阻管路12可以分别只设置一个或分别设置多个。另外，井下油水分离器3的下部还可以设置一缓冲腔，所述分离器进液口31位于所述缓冲腔的下端，所述限流管路的下端和所述摩阻管路的下端均与所述缓冲腔连通。井下采出液从所述分离器进液口31进入到缓冲腔内，低含油液体从缓冲腔进入摩阻管路12，富油液体从缓冲腔进入限流管路11，从而将井下采出液的油和水分离。In this embodiment, the flow-limiting pipeline 11 extends upwards in a straight line, and may be composed of multiple sections of large-diameter steel pipes 131 and multiple sections of small-diameter steel pipes 132 alternately connected; ; A straight steel pipe can also be used, and the straight steel pipe has different inner diameter sections arranged alternately in size. Its resistance is mainly local water head loss, and the resistance is related to the number of segments and pipe diameter of the pipeline. The friction pipeline 12 extends upwards in a curved and coiled manner to extend the length of the pipeline. The reason and purpose of adopting this setting method is: because the straight-line distance between two points is the shortest, the flow-limiting pipeline 11 extends upward along a straight line , so in order to make the length of the friction pipeline 12 greater than the length of the flow-limiting pipeline 11, the curved and coiled way used refers to any other way of the upwardly extending path except a straight line, which can be a curve or It is a combination of curves and straight lines, and it can also be extended upwards in the form of broken lines. When a curve is used, it can be spirally coiled upwards, or can be coiled upwards in an S shape. In practice, it can be composed of curved steel pipes; it can also be composed of multiple straight pipe sections 133 connected with multiple curved pipe sections 14 , and the length of the friction pipeline 12 is several times the length of the current limiting pipeline 11 . Its resistance is mainly the head loss along the way, and the resistance is related to the length of the pipeline. The outlet 112 of the flow limiting pipeline is located at the same height as the outlet 122 of the friction pipeline, the outlet 112 of the flow limiting pipeline faces upwards to be connected in series with the tubing 5 or other parts, and the outlet 122 of the friction pipeline faces the downhole oil-water separator 3, it is convenient for the low-oil liquid to flow out of the downhole oil-water separator 3 and enter the water injection layer W, and only one flow-limiting pipeline 11 and friction pipeline 12 can be provided respectively or a plurality of them can be provided respectively. In addition, a buffer chamber can also be provided at the bottom of the downhole oil-water separator 3, the liquid inlet 31 of the separator is located at the lower end of the buffer chamber, the lower end of the flow-limiting pipeline and the lower end of the friction pipeline are both communicate with the buffer cavity. The downhole production fluid enters the buffer chamber from the liquid inlet 31 of the separator, the low oil-containing liquid enters the friction pipeline 12 from the buffer chamber, and the oil-rich liquid enters the flow-restricting pipeline 11 from the buffer chamber, so that the downhole production Liquid oil and water separation.
由此可以看出，该井下油水分离器的限流管路内具有大小交替设置的过流面积，以局部阻力损失为主；摩阻管路的内部具有均匀的过流面积，且长度大于限流管路的长度，以沿程阻力损失为主。当油水两相混合流体进入该井下油水分离器后，油水将自动分离并进入不同的管路，粘度较高的油相主要流入以局部阻力损失为主的限流管路，并沿油管举升到地表；粘度较低的水相主要流入以沿程阻力损失为主的摩阻管路，并回注到注水层，从而实现对油水两相混合流体的分离，油水分离效率高，处理量大。It can be seen that the flow-limiting pipeline of the downhole oil-water separator has flow-flow areas alternately arranged in size, and the local resistance loss is the main factor; the inside of the friction-resistance pipeline has a uniform flow-flow area, and the length is greater than the limit The length of the flow pipeline is mainly determined by the resistance loss along the way. When the oil-water two-phase mixed fluid enters the downhole oil-water separator, the oil and water will automatically separate and enter different pipelines. The oil phase with higher viscosity mainly flows into the flow-limited pipeline mainly due to local resistance loss, and is lifted along the oil pipeline. to the surface; the water phase with low viscosity mainly flows into the friction pipeline mainly due to the resistance loss along the way, and is reinjected into the water injection layer, so as to realize the separation of the oil-water two-phase mixed fluid, with high oil-water separation efficiency and large processing capacity .
实施例二Embodiment two
如图2所示，本发明还提供了一种井下油水分离系统，该分离系统设置在油井的套管内，包括顶部封隔器6、筛管7、隔离封隔器8和油水分离管柱。所述顶部封隔器6螺纹连接在所述筛管7的上端，所述隔离封隔器8螺纹连接在所述筛管7的中部。筛管7与套管之间有环形空间，顶部封隔器6与所述隔离封隔器8之间的环形空间与注水层W对应，所述隔离封隔器8下方的环形空间与产液层P对应，隔离封隔器8将注水层W和产液层P隔离开。As shown in Fig. 2, the present invention also provides a downhole oil-water separation system, which is set in the casing of an oil well and includes a top packer 6, a screen 7, an isolation packer 8 and an oil-water separation string. The top packer 6 is screwed to the upper end of the screen 7 , and the isolation packer 8 is screwed to the middle of the screen 7 . There is an annular space between the screen 7 and the casing, the annular space between the top packer 6 and the isolation packer 8 corresponds to the water injection layer W, the annular space below the isolation packer 8 corresponds to the fluid production Corresponding to layer P, the isolation packer 8 isolates the water injection layer W and the liquid production layer P.
油水分离管柱下入到套管中，并穿过顶部封隔器6、筛管7和隔离封隔器8。所述油水分离管柱至少包括所述井下油水分离器3、插入密封装置9和油管5，井下油水分离器3可以采用一个或多个串接在管柱上，所述插入密封装置9通过所述油管5连接在所述井下油水分离器3的下方，所述插入密封装置9与所述隔离封隔器8密封插接配合，插入密封装置9插入到隔离封隔器8内，将隔离封隔器8的上方与下方隔离。井下油水分离器3下端螺纹连接油管5，分离器进液口31与油管5相连，所述摩阻管路出口122与所述注水层W连通；所述限流管路出口112通过油管5连通到地表。通过地层的压力，产液层P的产出液进入油管5中，并流到井下油水分离器3，经过井下油水分离器3将油水混合液中的富油液体和低含油液体进行分离，分离后的富油液体通过油管5举升到地表；分离后的低含油液体回注到注水层W。The oil-water separation string is lowered into the casing and passes through the top packer 6 , the screen 7 and the isolation packer 8 . The oil-water separation string at least includes the downhole oil-water separator 3, an insertion sealing device 9 and an oil pipe 5, and one or more downhole oil-water separators 3 can be connected in series on the string, and the insertion sealing device 9 passes through the The tubing 5 is connected below the downhole oil-water separator 3, and the insertion sealing device 9 is tightly plug-fitted with the isolation packer 8, and the insertion sealing device 9 is inserted into the isolation packer 8 to seal the isolation packer 8. The top and bottom of the spacer 8 are isolated. The lower end of the downhole oil-water separator 3 is threadedly connected to the oil pipe 5, the liquid inlet 31 of the separator is connected to the oil pipe 5, the outlet 122 of the friction pipeline is connected to the water injection layer W; the outlet 112 of the flow-limiting pipeline is connected through the oil pipe 5 to the surface. Through the pressure of the formation, the produced fluid from the fluid-producing layer P enters the tubing 5 and flows to the downhole oil-water separator 3, through which the oil-rich liquid and low-oil-containing liquid in the oil-water mixture are separated. The oil-rich liquid is lifted to the surface through the tubing 5; the separated low-oil liquid is reinjected into the water injection layer W.
在本实施例的一个实施方式中，油水分离管柱包括从上而下依次通过油管5串接的上部罐装泵1、井下油水分离器3、下部罐装泵4、插入密封装置9和带孔管10。上部灌装泵与所述井下油水分离器3之间还可以设有封隔器2。其中上部罐装泵1与油水分离器的限流管路11串接，即限流管路出口112与上部罐装泵1连通。井下油水分离器3的下端与下部罐装泵4连接，上部罐装泵1和下部罐装泵4的作用是产生举升的驱动力，只设置上部罐装泵1或下部罐装泵4其中一个也可以；带孔管10用来供产出液流入到油管5内。油水分离管柱与套管和筛管7之间均具有环形空隙。从而，在分离系统内形成有产出液流入通道A、富油液体举升通道B和低含油液体回注通道C。In one implementation of this example, the oil-water separation string includes an upper canned pump 1, a downhole oil-water separator 3, a lower canned pump 4, an insertion sealing device 9 and a belt Hole pipe 10. A packer 2 may also be provided between the upper filling pump and the downhole oil-water separator 3 . The upper canned pump 1 is connected in series with the flow-limiting pipeline 11 of the oil-water separator, that is, the outlet 112 of the flow-limiting pipeline communicates with the upper canned pump 1 . The lower end of the downhole oil-water separator 3 is connected to the lower canned pump 4. The function of the upper canned pump 1 and the lower canned pump 4 is to generate the driving force for lifting, and only the upper canned pump 1 or the lower canned pump 4 is provided. One is also possible; the perforated pipe 10 is used for the production fluid to flow into the oil pipe 5 . There is an annular gap between the oil-water separation string, the casing pipe and the screen pipe 7 . Thus, a production fluid inflow channel A, an oil-rich liquid lifting channel B and a low oil-containing liquid return channel C are formed in the separation system.
所述产出液流入通道A是指从产液层P到分离器进液口31的这段通道，将所述分离器进液口31与所述产液层P连通，产出液经过产出液流入通道A流到分离器进液口31。所述富油液体举升通道B是指限流管路11及其上方与地表连通的这段通道，富油液体通过富油液体举升通道B举升到地表。所述低含油液体回注通道C是指摩阻管路12及与注水层W连通的环空，低含油液体通过低含油液体回注通道C回注到注水层W。The production fluid inflow channel A refers to the passage from the production fluid layer P to the liquid inlet 31 of the separator, the liquid inlet 31 of the separator is connected with the production fluid layer P, and the production fluid passes through The outlet liquid flows into the channel A and flows to the liquid inlet 31 of the separator. The oil-rich liquid lifting channel B refers to the flow-limiting pipeline 11 and the channel above it that communicates with the ground surface. The oil-rich liquid is lifted to the ground surface through the oil-rich liquid lifting channel B. The low oil-containing liquid reinjection channel C refers to the friction pipeline 12 and the annular space connected to the water injection layer W, and the low oil content liquid is reinjected into the water injection layer W through the low oil content liquid reinjection channel C.
该井下油水分离系统的工作过程是，流体从产液层P通过筛管7后，首先进入设置在筛管7内的带孔管10，在下部罐装泵4举升下进入井下油水分离器3，即产出液流入通道A；流体进入油水分离器后，根据其性质不同，分别沿富油液体举升通道B和低含油液体回注通道C流出，油相流体粘度较大，将主要流入限流管路11，并从限流管路出口112排出后，在上部罐装泵1作用下举升到地表。而水相流体粘度较小，将主要流入摩阻管路12，并从摩阻管路出口122排出后，通过低含油液体回注通道C回注到注水层W。The working process of the downhole oil-water separation system is that after the fluid passes through the screen 7 from the liquid-producing layer P, it first enters the perforated pipe 10 arranged in the screen 7, and enters the downhole oil-water separator under the lifting of the lower tank pump 4 3. The produced fluid flows into channel A; after the fluid enters the oil-water separator, it flows out along the oil-rich liquid lifting channel B and the low oil-containing liquid reinjection channel C respectively according to its properties. The oil phase fluid has a high viscosity and will mainly After flowing into the flow-limiting pipeline 11 and being discharged from the outlet 112 of the flow-limiting pipeline, it is lifted to the surface under the action of the upper canned pump 1 . The water phase fluid has a low viscosity, and will mainly flow into the friction pipeline 12, and after being discharged from the friction pipeline outlet 122, it will be reinjected into the water injection layer W through the low oil content liquid reinjection channel C.
由上所述，该井下油水分离器的限流管路内具有大小交替设置的过流面积，以局部阻力损失为主；摩阻管路的内部具有均匀的过流面积，且长度大于限流管路的长度，以沿程阻力损失为主。当油水两相混合流体进入该井下油水分离器后，油水将自动分离并进入不同的管路，粘度较高的油相主要流入以局部阻力损失为主的限流管路，并沿油管举升到地表；粘度较低的水相主要流入以沿程阻力损失为主的摩阻管路，并回注到注水层，从而实现对油水两相混合流体的分离，油水分离效率高，处理量大。From the above, the flow-limiting pipeline of the downhole oil-water separator has flow-flow areas arranged alternately in size, mainly local resistance loss; the inside of the friction-resistance pipeline has a uniform flow-flow area, and the length is greater than the flow-limiting area. The length of the pipeline is mainly based on the resistance loss along the way. When the oil-water two-phase mixed fluid enters the downhole oil-water separator, the oil and water will automatically separate and enter different pipelines. The oil phase with higher viscosity mainly flows into the flow-limited pipeline mainly due to local resistance loss, and is lifted along the oil pipeline. to the surface; the water phase with low viscosity mainly flows into the friction pipeline mainly due to the resistance loss along the way, and is reinjected into the water injection layer, so as to realize the separation of the oil-water two-phase mixed fluid, with high oil-water separation efficiency and large processing capacity .
以上所述仅为本发明示意性的具体实施方式，并非用以限定本发明的范围。任何本领域的技术人员，在不脱离本发明的构思和原则的前提下所作出的等同变化与修改，均应属于本发明保护的范围。The above descriptions are only illustrative specific implementations of the present invention, and are not intended to limit the scope of the present invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principle of the present invention shall fall within the protection scope of the present invention.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610141387.1ACN105604536A (en) | 2016-03-14 | 2016-03-14 | Downhole oil-water separator and separation system |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610141387.1ACN105604536A (en) | 2016-03-14 | 2016-03-14 | Downhole oil-water separator and separation system |
| Publication Number | Publication Date |
|---|---|
| CN105604536Atrue CN105604536A (en) | 2016-05-25 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610141387.1APendingCN105604536A (en) | 2016-03-14 | 2016-03-14 | Downhole oil-water separator and separation system |
| Country | Link |
|---|---|
| CN (1) | CN105604536A (en) |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108894767A (en)* | 2018-06-14 | 2018-11-27 | 中国海洋石油集团有限公司 | A kind of upward suspension type downhole oil-water separation tubing string |
| CN109339779A (en)* | 2018-08-13 | 2019-02-15 | 中国石油天然气股份有限公司 | underground water content measuring device and method |
| CN112709553A (en)* | 2020-12-25 | 2021-04-27 | 中国石油大学(北京) | Toe end screen pipe of horizontal well |
| CN113006767A (en)* | 2021-04-26 | 2021-06-22 | 东北石油大学 | Underground oil-water separator and separation system thereof |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2290505C1 (en)* | 2005-12-06 | 2006-12-27 | Открытое акционерное общество "Татнефть" им. В.Д. Шашина | Well device for separation of oil and water |
| CN103883295A (en)* | 2014-03-25 | 2014-06-25 | 中国石油大学(北京) | Parallel type inflow control box and parallel type inflow control device |
| CN203702122U (en)* | 2014-03-12 | 2014-07-09 | 中国石油大学(华东) | Large-flow underground oil-water separator used at sea and equipped with lifting oil tubes |
| CN104453839A (en)* | 2014-12-19 | 2015-03-25 | 中国海洋石油总公司 | Large-discharge-capacity oil-water separation automatically flowing water injection system |
| CN104775797A (en)* | 2015-04-17 | 2015-07-15 | 北京沃客石油工程技术研究院 | Self-flow-regulating parallel shunt |
| CN104989369A (en)* | 2015-06-10 | 2015-10-21 | 中国海洋石油总公司 | High-flow-rate underground oil-water separation and annular space testing and regulating system |
| CN205591906U (en)* | 2016-03-14 | 2016-09-21 | 中国石油大学(北京) | Oil water separator and piece -rate system in pit |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2290505C1 (en)* | 2005-12-06 | 2006-12-27 | Открытое акционерное общество "Татнефть" им. В.Д. Шашина | Well device for separation of oil and water |
| CN203702122U (en)* | 2014-03-12 | 2014-07-09 | 中国石油大学(华东) | Large-flow underground oil-water separator used at sea and equipped with lifting oil tubes |
| CN103883295A (en)* | 2014-03-25 | 2014-06-25 | 中国石油大学(北京) | Parallel type inflow control box and parallel type inflow control device |
| CN104453839A (en)* | 2014-12-19 | 2015-03-25 | 中国海洋石油总公司 | Large-discharge-capacity oil-water separation automatically flowing water injection system |
| CN104775797A (en)* | 2015-04-17 | 2015-07-15 | 北京沃客石油工程技术研究院 | Self-flow-regulating parallel shunt |
| CN104989369A (en)* | 2015-06-10 | 2015-10-21 | 中国海洋石油总公司 | High-flow-rate underground oil-water separation and annular space testing and regulating system |
| CN205591906U (en)* | 2016-03-14 | 2016-09-21 | 中国石油大学(北京) | Oil water separator and piece -rate system in pit |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108894767A (en)* | 2018-06-14 | 2018-11-27 | 中国海洋石油集团有限公司 | A kind of upward suspension type downhole oil-water separation tubing string |
| CN108894767B (en)* | 2018-06-14 | 2020-12-04 | 中国海洋石油集团有限公司 | Upward suspension type underground oil-water separation tubular column |
| CN109339779A (en)* | 2018-08-13 | 2019-02-15 | 中国石油天然气股份有限公司 | underground water content measuring device and method |
| CN112709553A (en)* | 2020-12-25 | 2021-04-27 | 中国石油大学(北京) | Toe end screen pipe of horizontal well |
| CN113006767A (en)* | 2021-04-26 | 2021-06-22 | 东北石油大学 | Underground oil-water separator and separation system thereof |
| Publication | Publication Date | Title |
|---|---|---|
| AU2007217576B2 (en) | In-line separator | |
| US7314559B2 (en) | Separator | |
| CA3076495C (en) | Downhole sand and gas separation system for use with a rod pump | |
| US8297363B2 (en) | Device and method for improving liquid removal from gas, condensate and oil wells when using a multi-channel system | |
| CN106837294B (en) | Super-hydrophobic downhole oil-water separator and its injection-production string in the same well | |
| CN103541887B (en) | Sand-proof and gas-proof integrated oil production device | |
| CN105604536A (en) | Downhole oil-water separator and separation system | |
| US20190024491A1 (en) | Apparatuses and systems for regulating flow from a geological formation, and related methods | |
| RU2447269C1 (en) | Method to develop deposit with forced product offtake and device for its realisation | |
| CN205591906U (en) | Oil water separator and piece -rate system in pit | |
| CN113006767A (en) | Underground oil-water separator and separation system thereof | |
| CN106285620B (en) | High gas-oil ratio (HGOR) oil well gas-liquid piece-rate system | |
| US10267135B2 (en) | Oil production well gas separator system using progressive perforations | |
| CN104069650B (en) | A kind of oil-water separator and method for separating oil-water mixture in oil field | |
| Quintero et al. | Dynamics of Multiphase Flow Regimes in Toe-Up and Toe-Down Horizontal Wells | |
| GB2409691A (en) | Separating apparatus and method for phases of a downhole produced fluid | |
| CN102102507B (en) | Double-cavity sand and gas anchor | |
| CN112576233B (en) | Gas-liquid-solid separation device in shaft and manufacturing method thereof | |
| CN108854163A (en) | Oleophylic filler gravity separation oil-water separation device and separation method | |
| RU2483211C1 (en) | Plant for borehole separation of water-gas-oil mixture from water | |
| Singh et al. | Unconventional cyclone gas lift completion for offshore wells of Cambay Basin: A smart completion to optimize production and well intervention | |
| CN203626798U (en) | double-channel gas-liquid separator | |
| RU2446276C1 (en) | Development method of deposit with forced product withdrawal, and device for its implementation | |
| RU119026U1 (en) | PUMPING UNIT FOR SIMULTANEOUS-SEPARATE OPERATION OF TWO LAYERS IN A WELL | |
| CN204571950U (en) | Desanding sand control installation on a kind of pump for pumping well |
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | Application publication date:20160525 | |
| RJ01 | Rejection of invention patent application after publication |