WO2021057760A1 - Method, device, and system for low-frequency variable-pressure oil reservoir exploitation of remaining oil in pores - Google Patents

Method, device, and system for low-frequency variable-pressure oil reservoir exploitation of remaining oil in pores Download PDF

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WO2021057760A1
WO2021057760A1 PCT/CN2020/116982 CN2020116982W WO2021057760A1 WO 2021057760 A1 WO2021057760 A1 WO 2021057760A1 CN 2020116982 W CN2020116982 W CN 2020116982W WO 2021057760 A1 WO2021057760 A1 WO 2021057760A1
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pressure
gas
low
oil
reservoir
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PCT/CN2020/116982
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French (fr)
Chinese (zh)
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陈兴隆
韩海水
俞宏伟
李思源
周体尧
姬泽敏
张善严
王敬瑶
伍家忠
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中国石油天然气股份有限公司
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Priority to CN201910903838.4 priority Critical
Priority to CN201910903838.4A priority patent/CN112627785A/en
Priority to CN201910903824.2 priority
Priority to CN201910903824.2A priority patent/CN112627784A/en
Application filed by 中国石油天然气股份有限公司 filed Critical 中国石油天然气股份有限公司
Publication of WO2021057760A1 publication Critical patent/WO2021057760A1/en

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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/16Enhanced recovery methods for obtaining hydrocarbons
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00Survey of boreholes or wells
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00Survey of boreholes or wells
    • E21B47/06Measuring temperature or pressure
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00Survey of boreholes or wells
    • E21B47/09Locating or determining the position of objects in boreholes or wells, e.g. the position of an extending arm; Identifying the free or blocked portions of pipes

Abstract

A method, a device, and a system for low-frequency variable-pressure oil reservoir exploitation of remaining oil in pores. The method comprises: acquiring a distribution diagram of gas in an oil reservoir and a pressure distribution diagram during gas injection; determining the position of a shaft device of a low-frequency variable-pressure well in the oil reservoir according to the distribution diagram and the pressure distribution diagram; intermittently raising and lowering a pressure at a preconfigured frequency by using the position of the shaft device of the low-frequency variable-pressure well in the oil reservoir; and exploiting, by means of a steam injection well and an oil production well, remaining oil in the oil reservoir in which a distribution status of the remaining oil has changed. The system comprises: the shaft device, a data analysis device, and an oil production device. The shaft device comprises: a support packer (1), a support sub (2), an oil layer packer (3), a vent sleeve (4), a high-pressure container (5), an electromagnetic pneumatic valve (6), a gas booster unit (7), and a hollow connecting rod (8). Short-term high pressure is achieved in the vicinity of a wellbore, such that the remaining oil is desorbed, and a direction of a main seepage channel is changed, thereby further improving extraction.

Description

孔隙内剩余油的低频变压油藏开采方法、装置和系统Low-frequency variable pressure oil reservoir exploitation method, device and system of remaining oil in pores 技术领域Technical field
本发明涉及油田开发技术领域,特别涉及一种孔隙内剩余油的低频变压油藏开采方法、装置和系统。The invention relates to the technical field of oilfield development, and in particular to a low-frequency variable pressure oil reservoir exploitation method, device and system for remaining oil in pores.
背景技术Background technique
注气驱油技术是注水开发后期及低渗透油藏开发的优势技术,其具有低渗流阻力、地层压力恢复快、驱油效果明显等优点,但是也存在难以克服的缺点,即气体容易在油藏中沿高渗通道窜流,一旦气体指进,并在油藏中形成通道,从产出井产出后,后期注入的气体将很难发挥驱油作用。而油藏中,包括窜流通道的部分孔隙内却仍含有较高饱和度的剩余油,现有技术有封堵部分窜流通道的方法,但是通常只能解决近井地带,堵剂很难进入油藏深部,该方法主要作用是能一定程度地改变注入气体的渗流方向,目的并非是提高窜流通道及周边孔隙内的剩余油,因此,现有技术对该部分剩余油的动用尚没有较好的方法。Gas injection and oil displacement technology is an advantageous technology in the late stage of water injection development and the development of low-permeability reservoirs. It has the advantages of low seepage resistance, quick recovery of formation pressure, and obvious oil displacement effect. However, it also has disadvantages that are difficult to overcome, that is, gas is easily trapped in the oil. The reservoir flows along the high-permeability channel. Once the gas has entered and formed a channel in the reservoir, it will be difficult for the gas injected in the later stage to play the role of oil displacement after being produced from the production well. However, in oil reservoirs, some pores including channeling channels still contain high-saturation remaining oil. The prior art has a method to plug some channeling channels, but usually it can only solve the near-well zone, and the plugging agent is difficult. Into the deep part of the reservoir, the main function of this method is to change the seepage direction of the injected gas to a certain extent. The purpose is not to increase the remaining oil in the channeling channel and the surrounding pores. Therefore, the existing technology has not used this part of the remaining oil. The better way.
发明内容Summary of the invention
本发明实施例提供了一种孔隙内剩余油的低频变压油藏开采方法、装置和系统,解决了现有技术中无法对窜流通道的部分孔隙内含有的较高饱和度的剩余油进行开采的技术问题。The embodiments of the present invention provide a low-frequency variable pressure oil reservoir production method, device and system for remaining oil in pores, which solves the problem that the prior art cannot perform high-saturation remaining oil in some pores of channeling channels. Technical issues of mining.
本发明实施例提供了一种低频变压井井筒装置,包括:支撑封隔器、支撑短节、油层封隔器、通气套筒、高压容器、电磁气控阀门、气体增压机组和中空连杆,支撑封隔器、支撑短节、油层封隔器、通气套筒、高压容器、电磁气控阀门、气体增压机组和中空连杆位于套管内;The embodiment of the present invention provides a low-frequency variable pressure well wellbore device, which includes: a support packer, a support nipple, an oil layer packer, a vent sleeve, a high-pressure vessel, an electromagnetic gas control valve, a gas booster unit, and a hollow connection Rod, support packer, support sub-section, oil layer packer, vent sleeve, high pressure vessel, electromagnetic gas control valve, gas booster unit and hollow connecting rod are located in the casing;
其中,支撑封隔器用于:涨开卡在套管内壁与支撑短节之间,对支撑短节进行支撑;Among them, the supporting packer is used to: expand the card between the inner wall of the casing and the supporting sub to support the supporting sub;
支撑短节的下部与支撑封隔器相连,支撑短节的上部与油层封隔器相连,支撑短节为管状,管侧有孔眼,孔眼用于使下部油层内的气体通过进入油层封隔器;The lower part of the support pup joint is connected with the support packer, and the upper part of the support pup joint is connected with the oil layer packer. The support pup joint is tubular and has holes on the pipe side. The holes are used to allow the gas in the lower oil layer to pass into the oil layer packer. ;
油层封隔器用于:隔断上部油层,使得气体在下部油层进出;The oil layer packer is used to: isolate the upper oil layer so that gas enters and exits in the lower oil layer;
通气套筒的下部且外部与油层封隔器相连接,通气套筒的内部与高压容器连接,通气套筒的筒壁有通孔,为油层封隔器内的气体进入上部套管空间的通道;The lower part of the aeration sleeve and the outside are connected with the oil layer packer, the inside of the aeration sleeve is connected with the high-pressure vessel, and the cylinder wall of the aeration sleeve has through holes, which are the channels for the gas in the oil layer packer to enter the upper casing space ;
电磁气控阀门通过通气套筒的通孔与通气套筒连接,用于通孔的打开和关闭,使得下部油层的气体进入高压容器和上部空间;The electromagnetic gas control valve is connected to the vent sleeve through the through hole of the vent sleeve, and is used to open and close the through hole, so that the gas in the lower oil layer can enter the high-pressure container and the upper space;
高压容器的下端与通气套筒的内部连接,高压容器的上端与气体增压机组连接,高压容器为中空筒状;The lower end of the high-pressure container is connected with the inside of the vent sleeve, the upper end of the high-pressure container is connected with the gas booster unit, and the high-pressure container is in the shape of a hollow cylinder;
气体增压机组用于将高压容器内的低压气体压缩成高压气体;The gas booster unit is used to compress the low-pressure gas in the high-pressure container into high-pressure gas;
中空连杆的底部连接气体增压机组,中空连杆的顶部连接在外部地面控制装置上,用于使外部气体进入低频变压井井筒装置,使下部油层内的气体排出低频变压井井筒装置。The bottom of the hollow connecting rod is connected to the gas booster unit, and the top of the hollow connecting rod is connected to the external ground control device, which is used to make the external gas enter the low-frequency variable pressure well wellbore device, and the gas in the lower oil layer is discharged from the low-frequency variable pressure well wellbore device .
本发明实施例还提供了一种孔隙内剩余油的低频变压油藏开采方法,包括:The embodiment of the present invention also provides a low-frequency variable pressure oil reservoir production method for the remaining oil in the pores, including:
获取气体在油藏内的分布图、注气过程中注采井间的压力分布图;Obtain the gas distribution map in the reservoir and the pressure distribution map between the injection and production wells during the gas injection process;
根据所述气体在油藏内的分布图、注气过程中注采井间的压力分布图,确定低频变压井井筒装置在油藏内的放置位置;Determine the placement position of the low-frequency variable pressure well borehole device in the oil reservoir according to the gas distribution map in the oil reservoir and the pressure distribution map between the injection and production wells during the gas injection process;
采用低频变压井井筒装置在油藏内的放置位置以预设的频率间歇地升高和降低压力,改变放置位置的油藏内的剩余油分布状态;The placement position of the low-frequency variable pressure well borehole device in the reservoir is used to intermittently increase and decrease the pressure at a preset frequency to change the remaining oil distribution in the reservoir at the placement position;
通过注汽井和采油井对改变了剩余油分布状态的油藏内的剩余油进行开采。Through steam injection wells and oil production wells, the remaining oil in the reservoir that has changed the distribution of the remaining oil is exploited.
本发明实施例还提供了一种孔隙内剩余油的低频变压油藏开采系统,包括:低频变压井井筒装置、数据分析装置、采油装置;The embodiment of the present invention also provides a low-frequency variable pressure oil reservoir production system for remaining oil in pores, including: a low-frequency variable pressure well borehole device, a data analysis device, and an oil production device;
其中,数据分析装置用于:获取气体在油藏内的分布图、注气过程中注采井间的压力分布图,根据所述气体在油藏内的分布图、注气过程中注采井间的压力分布图,确定低频变压井井筒装置在油藏内的放置位置;Among them, the data analysis device is used to: obtain the distribution map of the gas in the reservoir, the pressure distribution map between the injection and production wells during the gas injection process, and according to the distribution map of the gas in the reservoir, the injection and production wells during the gas injection process To determine the placement position of the low-frequency variable pressure well borehole device in the reservoir;
低频变压井井筒装置用于:放置在油藏内的相应位置,在油藏内的放置位置以预设的频率间歇地升高和降低压力,改变放置位置的油藏内的剩余油分布状态;The low-frequency variable pressure well borehole device is used to place it in the corresponding position in the oil reservoir, and the placement position in the oil reservoir to intermittently increase and decrease the pressure at a preset frequency, and to change the remaining oil distribution state in the reservoir at the placement position ;
采油装置用于:通过注汽井和采油井对改变了剩余油分布状态的油藏内的剩余油进行开采。The oil extraction device is used to extract the remaining oil in the reservoir that has changed the distribution of the remaining oil through steam injection wells and oil production wells.
本发明实施例还提供了一种计算机设备,包括存储器、处理器及存储在存储器上并可在处理器上运行的计算机程序,所述处理器执行所述计算机程序时实现上述所述方法。The embodiment of the present invention also provides a computer device including a memory, a processor, and a computer program stored in the memory and capable of running on the processor, and the processor implements the above-mentioned method when the computer program is executed.
本发明实施例还提供了一种计算机可读存储介质,所述计算机可读存储介质存储有执行上述所述方法的计算机程序。The embodiment of the present invention also provides a computer-readable storage medium, and the computer-readable storage medium stores a computer program for executing the above-mentioned method.
在本发明实施例中,根据气体在油藏内的分布图、注气过程中注采井间的压力分布图,确定将低频变压井井筒装置放置到油藏内的一定位置,以预设的频率间歇地升高和降低压力,从而改变放置位置的油藏内的剩余油分布状态,这样通过注汽井和采油井对改变了剩余油分布状态的油藏内的剩余油进行开采,可以提高采出程度。In the embodiment of the present invention, according to the gas distribution map in the reservoir and the pressure distribution map between the injection and production wells during the gas injection process, it is determined that the low-frequency variable pressure well bore device is placed in a certain position in the reservoir to preset Increase and decrease the pressure intermittently at the frequency of the system, so as to change the remaining oil distribution state in the reservoir at the placement position. In this way, the remaining oil in the reservoir that has changed the remaining oil distribution state can be exploited through steam injection wells and oil production wells. Improve the degree of recovery.
附图说明Description of the drawings
为了更清楚地说明本发明实施例或现有技术中的技术方案,下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图仅仅是本发明的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图获得其他的附图。In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.
图1是注气过程中气体在油藏内的分布示意图;Figure 1 is a schematic diagram of gas distribution in the reservoir during gas injection;
图2是注气过程中气体在油藏内的截面气体放大分布示意图;Figure 2 is a schematic diagram of the enlarged cross-sectional gas distribution of the gas in the reservoir during the gas injection process;
图3是注气过程中放大区域内剩余油分布状态示意图;Figure 3 is a schematic diagram of the remaining oil distribution in the enlarged area during the gas injection process;
图4是注气过程中注采井间的压力分布示意图;Figure 4 is a schematic diagram of pressure distribution between injection and production wells during gas injection;
图5是本发明实施例提供的一种孔隙内剩余油的低频变压油藏开采方法示意图。Fig. 5 is a schematic diagram of a low-frequency variable pressure oil reservoir production method for remaining oil in pores according to an embodiment of the present invention.
图6是本发明实施例提供的低频变压法的压力分布示意图;Fig. 6 is a schematic diagram of pressure distribution of a low-frequency variable pressure method provided by an embodiment of the present invention;
图7是本发明实施例提供的低频变压井井筒装置结构示意图;Figure 7 is a schematic structural diagram of a low-frequency variable pressure well wellbore device provided by an embodiment of the present invention;
图8是本发明实施例提供的通气套筒结构示意图;Figure 8 is a schematic structural diagram of a vent sleeve provided by an embodiment of the present invention;
图9是本发明实施例提供的气体经过通气套筒的流动示意图;Figure 9 is a schematic diagram of the flow of gas through a vent sleeve provided by an embodiment of the present invention;
图10是本发明实施例提供的高压容器结构示意图;Figure 10 is a schematic diagram of the structure of a high-pressure vessel provided by an embodiment of the present invention;
图11是本发明实施例提供的高压容器部分组合结构示意图;Figure 11 is a schematic diagram of a partially assembled structure of a high-pressure vessel provided by an embodiment of the present invention;
图12是本发明实施例提供的电磁气控阀门主视图;Figure 12 is a front view of an electromagnetic pneumatic valve provided by an embodiment of the present invention;
图13是本发明实施例提供的电磁气控阀门俯视图;Figure 13 is a top view of an electromagnetic pneumatic valve provided by an embodiment of the present invention;
图14是本发明实施例提供的气体增压机简图;Figure 14 is a schematic diagram of a gas booster provided by an embodiment of the present invention;
图15是本发明实施例提供的气体增压机抽象图;Figure 15 is an abstract diagram of a gas booster provided by an embodiment of the present invention;
图16是本发明实施例提供的并联的气体增压机组示意图;Figure 16 is a schematic diagram of a parallel gas booster unit provided by an embodiment of the present invention;
图17是本发明实施例提供的中空连杆结构示意图。Figure 17 is a schematic view of the hollow connecting rod structure provided by an embodiment of the present invention.
具体实施方式detailed description
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.
注气开发通常是在注入井注入气体,在生产井采油。气体作为驱替原油的驱替剂,主要作用是其渗流阻力小,特别在低渗透等注水困难的油藏,注气能获得较好的效果。也正是因为其渗流阻力小的特点,在驱油过程中,指进现象严重,当生产井见气后,气体含量会快速上升,导致气窜现象的发生。气窜后生产井大部分需要停井处理,致使注气见效期短,气驱采收率低,注气技术不能广泛应用。图1至图3显示了注气过程中油藏内的流体状态。图1为纵向剖面,在油藏中部形成气体主通道,周围则存在较大体积的气体未波及区域,尤其是油藏底部未动用体积最多。图2为横截面上气体主通道和未波及区域的形状。图3是图2中局部区域的放大效果,说明即使是主通道大部分孔隙中,仍滞留了可观的剩余油。其原因是气体窜流后,主通道内形成连续的气相,气体流动趋于稳定,受岩石颗粒的阻挡、界面张力、吸附等作用的影响,使部分剩余油无法流动。Gas injection development usually involves injecting gas in injection wells and producing oil in production wells. The main function of gas as a displacing agent for displacing crude oil is its low seepage resistance, especially in low-permeability reservoirs where water injection is difficult, gas injection can achieve better results. It is precisely because of its low seepage resistance that the fingering phenomenon is serious during the oil displacement process. When the production well sees gas, the gas content will rise rapidly, leading to the occurrence of gas channeling. After gas channeling, most of the production wells need to be shut down for treatment, resulting in a short effective period of gas injection and low recovery rate of gas flooding. Gas injection technology cannot be widely used. Figures 1 to 3 show the fluid state in the reservoir during the gas injection process. Figure 1 is a longitudinal section. The main gas channel is formed in the middle of the reservoir, and there is a relatively large volume of gas unswept area around, especially the bottom of the reservoir where the unused volume is the most. Figure 2 shows the shape of the main gas channel and the unaffected area in cross section. Figure 3 is an enlarged effect of the local area in Figure 2, showing that even though most of the pores of the main channel, there is still a considerable amount of remaining oil retained. The reason is that after the gas flows through, a continuous gas phase is formed in the main channel, and the gas flow tends to be stable. Due to the blocking of rock particles, interfacial tension, adsorption, etc., part of the remaining oil cannot flow.
图4显示了注气稳定产出时,注采井间压力沿长度上的分布。注入井压力最高Pin,产出压力最低Pout。在注入井井底压降漏斗明显,即压降梯度较大,之后压力趋于平缓,i位置的压力Pi与Pout之差ΔP较小。曲线1和曲线2分别为高渗油藏和低渗油藏的压力分布示意,i位置的压差低渗油藏小于高渗油藏,使其孔隙内的剩余油更多。即,油藏渗透率越低,气窜带来的影响越严重,剩余油饱和度越高,采出程度越低。Figure 4 shows the pressure distribution along the length between injection and production wells when gas injection is stably produced. The injection well has the highest pressure Pin and the production pressure has the lowest Pout. At the bottom of the injection well, the pressure drop funnel is obvious, that is, the pressure drop gradient is larger, then the pressure tends to be flat, and the difference ΔP between the pressure Pi and Pout at position i is small. Curve 1 and curve 2 respectively show the pressure distribution of high-permeability and low-permeability reservoirs. The low-permeability reservoir with differential pressure at position i is smaller than that of the high-permeability reservoir, so that there is more remaining oil in the pores. That is, the lower the reservoir permeability, the more serious the impact of gas channeling, the higher the remaining oil saturation, and the lower the degree of recovery.
针对油藏孔隙内剩余油分布位置及受力特点,提出了低频变压的方法。如图5所示,该方法包括:According to the remaining oil distribution position and force characteristics in the reservoir pores, a low-frequency variable pressure method is proposed. As shown in Figure 5, the method includes:
步骤501:获取气体在油藏内的分布图、注气过程中注采井间的压力分布图;Step 501: Obtain the gas distribution map in the reservoir and the pressure distribution map between the injection and production wells during the gas injection process;
步骤502:根据所述气体在油藏内的分布图、注气过程中注采井间的压力分布图,确定低频变压井井筒装置在油藏内的放置位置;Step 502: Determine the placement position of the low-frequency variable pressure well bore device in the oil reservoir according to the gas distribution map in the oil reservoir and the pressure distribution map between the injection and production wells during the gas injection process;
步骤503:采用低频变压井井筒装置在油藏内的放置位置以预设的频率间歇地升高和降低压力,改变放置位置的油藏内的剩余油分布状态;Step 503: Use the placement position of the low-frequency variable pressure well borehole device in the reservoir to intermittently increase and decrease the pressure at a preset frequency, and change the remaining oil distribution state in the reservoir at the placement position;
步骤504:通过注汽井和采油井对改变了剩余油分布状态的油藏内的剩余油进行开采。Step 504: Exploit the remaining oil in the oil reservoir whose distribution state of the remaining oil has been changed through the steam injection well and the oil production well.
即利用低频变压井井筒装置在低压力位置(即放置位置)以一定频率间歇地升高和降低压力,造成该位置周围一定范围内的压力发生变化。该作用使原来稳定的气体流动被改变,气体渗流方向在一个频次内经历逆转式的改变,从而使波及范围孔隙内的剩余油状态改变,一部分剩余油达到流动状态,并被采出,提高了采出程度。同时剩余状态的改变及低频注气井会造成影响区域内渗流阻力的重新分布,致使原来形成的主渗流通道形状乃至方向发生改变,这将扩大气驱的波及体积,提高采出程度更加显著。That is, the low-frequency variable pressure well borehole device is used to intermittently increase and decrease the pressure at a certain frequency at a low pressure position (ie, the placement position), which causes the pressure within a certain range around the position to change. This effect causes the original stable gas flow to be changed, and the gas seepage direction undergoes a reversal change within a frequency, thereby changing the state of the remaining oil in the pores of the affected area, and a part of the remaining oil reaches the flowing state and is produced, which improves Extraction degree. At the same time, the change of the remaining state and the low-frequency gas injection well will cause the redistribution of the seepage resistance in the affected area, resulting in a change in the shape and direction of the main seepage channel originally formed, which will expand the swept volume of gas flooding and increase the degree of recovery more significantly.
图6显示在注采井中间位置设置了低频变压井,由该井注入气体造成压力升高,之后该井快速排出气体造成压力降低,当速度较高时,其压力将低于起始压力。由对应的压力曲线(注入压力线和排出压力线)分析可知,影响区域内的渗流状态必然受到压力变化的影响,其中,P fimax为注入压力最大值,P fomin为排出压力最小值。 Figure 6 shows that a low-frequency variable pressure well is set in the middle of the injection-production well. The gas injected into the well causes the pressure to rise, and then the well quickly discharges the gas to cause the pressure to drop. When the speed is higher, the pressure will be lower than the initial pressure . The analysis of the corresponding pressure curves (injection pressure line and discharge pressure line) shows that the seepage state in the affected area is inevitably affected by pressure changes, where P fimax is the maximum injection pressure and P fomin is the minimum discharge pressure.
在本发明实施例中,低频变压方法原理能否实现关键在于低频变压井井筒装置的设计。为实现气体高流速流动并在近井地带造成短时高压的效果,本发明设计了相应的低频变压井井筒装置,见图7。In the embodiment of the present invention, the key to the realization of the principle of the low-frequency variable pressure method lies in the design of the wellbore device of the low-frequency variable pressure well. In order to achieve the effect of gas flowing at a high velocity and causing short-term high pressure in the near-well zone, the present invention designs a corresponding low-frequency variable pressure well wellbore device, as shown in Figure 7.
该低频变压井井筒装置由下至上分别为:支撑封隔器1、支撑短节2、油层封隔器3、通气套筒4、高压容器5、电磁气控阀门6、气体增压机组7和中空连杆8组成,其中,支撑封隔器1、支撑短节2、油层封隔器3、通气套筒4、高压容器5、电磁气控阀门6、气体增压机组7和中空连杆8位于套管9内。The low-frequency variable pressure well borehole devices from bottom to top are: support packer 1, support short section 2, oil layer packer 3, vent sleeve 4, high pressure vessel 5, electromagnetic gas control valve 6, gas booster unit 7 It is composed of hollow connecting rod 8, including supporting packer 1, supporting short section 2, oil layer packer 3, vent sleeve 4, high pressure vessel 5, electromagnetic gas control valve 6, gas booster unit 7 and hollow connecting rod 8 is located inside the sleeve 9.
其中,支撑封隔器1为油田常用装备,其作用是由卡瓦机械装置涨开卡在套管9内壁上,密封胶皮筒撑开,起到隔离上下空间的作用,整体也起到支撑上方管柱的作用。其型号众多,本发明可选用操控简单、封隔效果好的型号,上部采用Y445封隔器,下部采用Y221封隔器。Among them, the support packer 1 is a commonly used equipment in oilfields. Its function is to be clamped on the inner wall of the casing 9 by the slip mechanical device, and the sealing rubber tube is expanded to isolate the upper and lower spaces, and the whole also supports the upper part. The role of the pipe string. There are many models, and the present invention can choose a model with simple operation and good packing effect. The upper part adopts the Y445 packer and the lower part adopts the Y221 packer.
支撑短节2为设计装置,管状,侧面有孔眼。下部与支撑封隔器1相连,上部与油层封隔器3相连。孔眼的作用是允许下部油层内的气体无阻通过进入油层封隔器3。The supporting sub 2 is a design device, tubular, with perforations on the side. The lower part is connected with the supporting packer 1, and the upper part is connected with the oil layer packer 3. The function of the hole is to allow the gas in the lower oil layer to pass into the oil layer packer 3 without obstruction.
油层封隔器3起隔断油层的作用,由封隔橡胶隔断上部油层,气体在下部油层中进出。The oil layer packer 3 plays the role of isolating the oil layer, the upper oil layer is separated by the packing rubber, and the gas enters and exits in the lower oil layer.
通气套筒4、高压容器5、电磁气控阀门6、气体增压机组7和中空连杆8是核心的设计部件。The vent sleeve 4, the high-pressure vessel 5, the electromagnetic gas control valve 6, the gas booster unit 7 and the hollow connecting rod 8 are the core design components.
①通气套筒4①Vent sleeve 4
通气套筒4的下部且外部有短节(短节是工业管道连接中常用的一种配件。常见的有螺纹短节,分为双头外丝、单头外丝、平头外丝几种。)与油层封隔器3相连接,内 部与高压容器5通过内丝扣41连接。其结构见图8,通气套筒4的筒壁42有通孔43,是底部油层封隔器3内气体进入上部套管空间的通道。见图9,气体流动示意图。与高压容器5连接位置的通孔圆度好且内壁光滑,该通孔与电磁气控阀门6的橡胶柱配合,具有阀门功能。The lower part of the vent sleeve 4 has a short section on the outside (the short section is a commonly used accessory in industrial pipe connections. The common threaded section is divided into double-ended outer wires, single-ended outer wires, and flat-end outer wires. ) Is connected to the oil layer packer 3, and the inside is connected to the high-pressure vessel 5 through an inner thread 41. Its structure is shown in Figure 8. The cylinder wall 42 of the vent sleeve 4 has a through hole 43, which is a passage for the gas in the bottom oil layer packer 3 to enter the upper casing space. See Figure 9, a schematic diagram of gas flow. The through hole at the connection position of the high-pressure vessel 5 has good roundness and smooth inner wall. The through hole is matched with the rubber column of the electromagnetic pneumatic valve 6 and has a valve function.
②高压容器5②High pressure vessel 5
高压容器5的结构简单,中空筒状,两端端盖为内嵌式,即通过内丝扣51与通气套筒4的内部连接,外筒两端均为外丝扣52,见图10。高压容器5的一端与通气套筒4的内部连接,高压容器5的另一端与气体增压机组7连接。底部端盖在连接通气套筒4后安装定压阀门53,见图11。在定压阀门53下方安装电磁气控阀门6。定压阀门53在达到设计压力时其高压出气口54开启,并保持持续开启状态,直至内外流体压力平衡,再行关闭。The high-pressure vessel 5 has a simple structure, a hollow cylindrical shape, and the end caps at both ends are built-in, that is, are connected to the inside of the vent sleeve 4 through an inner thread 51, and both ends of the outer cylinder are both outer threads 52, as shown in FIG. One end of the high-pressure container 5 is connected to the inside of the vent sleeve 4, and the other end of the high-pressure container 5 is connected to the gas booster unit 7. After the bottom end cover is connected to the vent sleeve 4, a constant pressure valve 53 is installed, as shown in Fig. 11. An electromagnetic air control valve 6 is installed below the constant pressure valve 53. When the constant pressure valve 53 reaches the design pressure, its high-pressure air outlet 54 is opened and kept open until the internal and external fluid pressures are balanced, and then closed.
由于井底内的套管内径仅10cm,若提高高压容器的容积只能采取加长的方式,其最大的长度即为井筒深度。通常我国油田油藏深度大于1000m,设容器内径为6cm,则1000m等径长管的空间体积约为3m 3Since the inner diameter of the casing at the bottom of the well is only 10 cm, if the volume of the high-pressure vessel is increased, the only way to extend it is to extend it, and its maximum length is the depth of the wellbore. Generally, the depth of the oil reservoir in our country is greater than 1000m, and if the inner diameter of the container is 6cm, the space volume of the 1000m equal-diameter long pipe is about 3m 3 .
因而根据油井的具体套管使用情况确定高压容器长度,使其最大化。通常套管分为表层套管、技术套管和油层套管,且其长度因井况而不同。表层套管、技术套管和油层套管的最小内径分别为:21.6cm、15.0cm和10.0cm。设油藏深度2000m,表层套管200m、技术套管1600m和油层套管200m,则高压容器也可设计成由下而上逐渐变粗的形式,对应于不同套管类型,高压容器内径分别为12.0cm、9.0cm和6.0cm,若长度与对应套管等长,则该梯形高压容器空间体积约为15m 3Therefore, the length of the high-pressure container is determined according to the specific casing usage of the oil well to maximize it. Generally, casing is divided into surface casing, technical casing and oil casing, and its length varies with well conditions. The minimum inner diameters of surface casing, technical casing and oil layer casing are 21.6cm, 15.0cm and 10.0cm respectively. Assuming that the reservoir depth is 2000m, the surface casing is 200m, the technical casing is 1600m, and the oil casing is 200m, the high-pressure vessel can also be designed to gradually thicken from bottom to top. Corresponding to different casing types, the inner diameter of the high-pressure vessel is respectively 12.0cm, 9.0cm and 6.0cm, if the length is the same as the corresponding sleeve, the space volume of the trapezoidal high-pressure vessel is about 15m 3 .
由于低频变压法需要在高压容器内建立2倍于环空压力条件,因而不能使用现有套管作为容器,其壁厚在5~10mm内,耐压能力不强。本方法设计的容器采用316钢,壁厚在10~20mm内,耐压最大可达70MPa。Since the low-frequency variable pressure method needs to establish a condition of 2 times the annulus pressure in the high-pressure vessel, the existing casing cannot be used as the vessel. Its wall thickness is within 5-10mm, and the pressure resistance is not strong. The container designed by this method is made of 316 steel, the wall thickness is within 10-20mm, and the maximum pressure resistance can reach 70MPa.
由于现场操作条件,高压容器单根长度10m,由密封接箍连接两端,逐渐串联而成。在变径段,密封接箍变径即可。该技术为成熟技术,不再赘述。Due to on-site operating conditions, a single high-pressure vessel has a length of 10m, which is gradually connected in series by connecting the two ends with a sealed coupling. In the reducing section, the sealing coupling can be reduced in diameter. This technology is a mature technology and will not be repeated here.
③电磁气控阀门6③Electromagnetic pneumatic control valve 6
电磁气控阀门6包括多个活塞式锥形堵头61,如图12所示,活塞式锥形堵头为L型,多个活塞式锥形堵头61通过多路通气接头62连接。活塞式锥形堵头61包括锥形堵头611、连接杆612、磁吸活塞613、电磁块614、L型框体;其中,锥形堵头611、连 接杆612、磁吸活塞613依次连接,连接杆612、磁吸活塞613和电磁块614位于L型框体内。The electromagnetic air control valve 6 includes a plurality of piston-type cone plugs 61, as shown in FIG. 12, the piston-type cone plugs are L-shaped, and the plurality of piston-type cone plugs 61 are connected by a multi-way air joint 62. The piston-type cone plug 61 includes a cone plug 611, a connecting rod 612, a magnetic piston 613, an electromagnetic block 614, and an L-shaped frame; among them, the cone plug 611, the connecting rod 612, and the magnetic piston 613 are connected in sequence , The connecting rod 612, the magnetic piston 613 and the electromagnetic block 614 are located in the L-shaped frame.
电磁气控阀门6是利用高压气体排出时的部分能量,推动活塞式锥形堵头向上运动,锥形堵头611封堵在通气套筒4的通孔43位置,使气体无法通过通气套筒4进入上部空间,而只能进入地层内。当高压气体卸压完毕,出口气体压力与周围环境压力平衡时,磁吸活塞613在电磁块614的电磁吸力作用下,通过连接杆612带动锥形堵头611向下运动,活塞式锥形堵头并依靠自身重力回到原位,则电磁气控阀门6开启,油层中排出的低压气体进入上部空间。电磁气控阀门6的堵头数量与通气套筒4配合使用,主视图见图12和俯视图见图13。The electromagnetic gas control valve 6 uses part of the energy when the high-pressure gas is discharged to push the piston-type cone plug to move upward. The cone plug 611 is blocked at the position of the through hole 43 of the vent sleeve 4, so that the gas cannot pass through the vent sleeve. 4 Enter the upper space, but can only enter the formation. When the high-pressure gas is relieved and the outlet gas pressure is balanced with the ambient pressure, the magnetic piston 613 is driven by the connecting rod 612 to move the cone plug 611 downward under the electromagnetic suction force of the electromagnetic block 614, and the piston-type cone plug When the head returns to the original position by its own gravity, the electromagnetic gas control valve 6 is opened, and the low-pressure gas discharged from the oil layer enters the upper space. The number of plugs of the electromagnetic air control valve 6 is used in conjunction with the vent sleeve 4. See Figure 12 for the front view and Figure 13 for the top view.
④气体增压机组7④Gas booster unit 7
气体增压机组7是由多个气体增压机并联而成,气体增压机是常规的应用装置,其作用是在空气压缩机提供动力的条件下,将低压气体压缩成高压气体。其结构及主要部件见图14所示,其中,每个气体增压机的动力气出口71和动力气入口72位于上方,每个气体增压机的高压气出口73位于下方,每个气体增压机的低压气入口74位于外壁下方,并联的单台气体增压机的高压气出口73、动力气出口71和动力气入口72均有汇集管,使气体增压机组同步工作。气体通过动力气入口72进入动力气空间75,动力气空间75下方为活塞低压端76,活塞高压端77下方为高压空间78,高压空间78包括两个口:高压气出口73和低压气入口74,低压气入口74与高压空间78之间包括一个流向控制阀79,活塞低压端76下方空间连接一个活塞后退气通道80,动力气出口71和动力气入口72之间有动力气转换通道81。其增压过程的原理处于成熟应用状态,因而此处不做赘述。The gas booster unit 7 is composed of multiple gas boosters in parallel. The gas booster is a conventional application device, and its function is to compress low-pressure gas into high-pressure gas under the condition that the air compressor provides power. Its structure and main components are shown in Figure 14. Among them, the power gas outlet 71 and power gas inlet 72 of each gas turbocharger are located above, and the high-pressure gas outlet 73 of each gas turbocharger is located below, and each gas increases The low-pressure gas inlet 74 of the compressor is located below the outer wall, and the high-pressure gas outlet 73, power gas outlet 71 and power gas inlet 72 of a single gas booster connected in parallel have collecting pipes to make the gas booster units work synchronously. Gas enters the power gas space 75 through the power gas inlet 72. Below the power gas space 75 is the low pressure end 76 of the piston. Below the high pressure end 77 of the piston is the high pressure space 78. The high pressure space 78 includes two ports: a high pressure gas outlet 73 and a low pressure gas inlet 74 A flow control valve 79 is included between the low-pressure gas inlet 74 and the high-pressure space 78. The space below the low-pressure end 76 of the piston is connected with a piston retreat gas passage 80. There is a power gas conversion passage 81 between the power gas outlet 71 and the power gas inlet 72. The principle of the pressurization process is in a mature application state, so I will not repeat it here.
由于本发明的特殊应用性,气体增压机的外形及部件规格需要满足井筒内条件,参见图15。Due to the special applicability of the present invention, the shape and component specifications of the gas booster need to meet the conditions in the wellbore, see FIG. 15.
本发明设计了连接保护套82,将气体增压机主体包裹保护,并且起到与上下装置连接的作用。In the present invention, a connecting protective sleeve 82 is designed to wrap and protect the main body of the gas booster, and play the role of connecting with the upper and lower devices.
其中,低压气入口74的开口位置设计在连接保护套82的外壁上,便于气体的进入。Wherein, the opening position of the low pressure gas inlet 74 is designed on the outer wall of the connecting protective sleeve 82 to facilitate gas entry.
高压气出口73位于连接保护套82的正下方,便于与高压容器连接。The high-pressure gas outlet 73 is located directly below the connecting protective sleeve 82, which is convenient for connection with the high-pressure container.
动力气入口72和动力气出口71均设置在连接保护套82的顶部位置,便于与上部部件(其他的气体增压机或中空连杆8)连接。The power gas inlet 72 and the power gas outlet 71 are both arranged at the top position of the connecting protective sleeve 82 to facilitate connection with the upper part (other gas boosters or hollow connecting rod 8).
多个气体增压机之间还通过各自的高压气汇集管83、动力气出口汇集管84和动力气入口汇集管85连接。最上端的气体增压机上安装有一个短节86,通过这个短节与中空连杆连接。The multiple gas boosters are also connected by respective high-pressure gas collection pipes 83, power gas outlet collection pipes 84 and power gas inlet collection pipes 85. A sub-section 86 is installed on the uppermost gas booster, which is connected to the hollow connecting rod through this sub-section.
本发明在应用过程中,每频次累计压缩气体10000~20000Nm 3,而设计的单台增压机排量很小,小于20NL/min。因而需要多台增压机并联组成机组提高排量。本发明的单台增压机具备了这样并联的条件,组合见图16所示。并联的单台增压机高压气、动力气出口和动力气入口均有汇集管,使机组同步工作。 In the application process of the present invention , 10,000-20,000 Nm 3 of compressed gas is accumulated per frequency, and the designed single turbocharger has a small displacement, less than 20 NL/min. Therefore, multiple turbochargers are required in parallel to form a unit to increase the displacement. The single turbocharger of the present invention has such conditions for parallel connection, and the combination is shown in Fig. 16. The high-pressure gas, power gas outlet and power gas inlet of a single turbocharger connected in parallel have collecting pipes to make the unit work synchronously.
⑤中空连杆8⑤Hollow connecting rod 8
中空连杆8结构简单,见图17。两头为配合的接头,一头为母扣接头87,一头为公扣接头88,依次连接即可。中空连杆8起到承受底部部分重量的作用,其中空通管89也是动力气出口和动力气入口汇集管的通道。中空连杆8底部连接气体增压机组7,顶部连接在外部地面控制装置(井口装置)上。The hollow connecting rod 8 has a simple structure, as shown in Figure 17. Two ends are mating connectors, one end is a female buckle connector 87, and the other end is a male buckle connector 88, which can be connected in sequence. The hollow connecting rod 8 plays a role of bearing the weight of the bottom part, and the hollow pipe 89 is also a channel for the power gas outlet and the power gas inlet collecting pipe. The bottom of the hollow connecting rod 8 is connected to the gas booster unit 7, and the top is connected to an external ground control device (wellhead device).
在本发明实施例中,低频变压井井筒装置的工作过程如下(即步骤503具体包括):In the embodiment of the present invention, the working process of the low-frequency variable pressure well borehole device is as follows (that is, step 503 specifically includes):
以注气驱油的低渗油藏采用低频变压法为例。低渗油藏渗透率低、孔隙结构复杂,导致注水压力高,导致注水困难、注不进现象普遍。该类型油藏采用注气方式也通常采用低注入量的方式开采,防止指进现象的发生。Take the low-frequency variable pressure method for low-permeability reservoirs with gas injection and oil displacement as an example. Low-permeability reservoirs have low permeability and complex pore structure, leading to high water injection pressure, resulting in difficulty in water injection, and common problems of non-injection. This type of reservoir is produced by gas injection and usually low injection rate to prevent fingering.
设油藏深度2000m,在井底流体压力10MPa条件下,日注气3方(3000Nm 3)。按照单频次注气10方(地层压力10MPa),7天1个频次的目标对油藏实施高压径向注入。 The reservoir depth is 2000m, and the daily gas injection is 3 cubic meters (3000Nm 3 ) under the condition of the bottom hole fluid pressure of 10MPa. According to the single-frequency gas injection of 10 cubic meters (formation pressure 10MPa), the goal of 1 frequency in 7 days is to implement high-pressure radial injection into the reservoir.
则低频变压井井筒装置的核心装置尺寸如下:The core device size of the low-frequency variable pressure well bore device is as follows:
高压容器内径6cm,串联总长度1000m,总容积3m 3The inner diameter of the high-pressure vessel is 6cm, the total length in series is 1000m, and the total volume is 3m 3 ;
气体增压机组由10台气体增压机组成。单台气体增压机最大工作压力60MPa,排出流量200L/min,工作与休息时间比例为2:1。6天时间内可将高压容器内流体压缩至50MPa。The gas booster unit consists of 10 gas boosters. The maximum working pressure of a single gas booster is 60MPa, the discharge flow is 200L/min, and the ratio of work to rest time is 2:1. The fluid in the high-pressure container can be compressed to 50MPa within 6 days.
中空连杆外径3cm,串联总长度约1000m。The outer diameter of the hollow connecting rod is 3cm, and the total length of the series is about 1000m.
动力气由普通空气泵提供,由于在地面工作,因此可通过并联达到排量要求,输出压力大于0.8MPa即可。The power gas is provided by an ordinary air pump. Because it works on the ground, it can be connected in parallel to meet the displacement requirements, and the output pressure is greater than 0.8MPa.
计算参数如下:The calculation parameters are as follows:
常压下气体密度约为水密度的千分之一,例如氮气1.25g/L。50℃,氮气10MPa和50MPa的密度分别为0.1g/mL和0.38g/mL。即在1000m长度的高压容器内,底部压力50MPa时,顶部压力仅为46MPa,折算至10MPa条件下,体积为14.0m 3The density of gas under normal pressure is about one-thousandth of the density of water, such as nitrogen 1.25g/L. At 50°C, the density of 10MPa and 50MPa nitrogen is 0.1g/mL and 0.38g/mL, respectively. That is, in a high-pressure vessel with a length of 1000 m, when the bottom pressure is 50 MPa, the top pressure is only 46 MPa. When converted to 10 MPa, the volume is 14.0 m 3 .
设井底流压保持10MPa稳定,则高压容器在注入地层后,底部仍保持10MPa压力,顶部压力约9MPa,容器内气体体积剩余3m 3,即注入地层11.0m 3Provided bottomhole pressure 10MPa remains stable, then injected into the formation after the pressure vessel, the bottom remains 10MPa pressure, top pressure of about 9MPa, the volume of remaining gas in the container 3m 3, i.e., injected into the formation 11.0m 3.
若计算精确考虑温度及压力梯度的影响,以及井筒底部气体不稳定条件流动的影响,实际注入地层气体体积略大于10m 3If the calculation accurately considers the influence of temperature and pressure gradient, and the influence of unstable gas flow at the bottom of the wellbore, the actual volume of gas injected into the formation is slightly larger than 10m 3 .
①装置入井前的设置①Setup before the device enters the well
调整气体增压机工作压力为50MPa;调整高压容器定压阀门压力为50MPa。Adjust the working pressure of the gas booster to 50MPa; adjust the pressure of the constant pressure valve of the high-pressure vessel to 50MPa.
地面控制电磁气控阀门开启和关闭。The ground control electromagnetic pneumatic valve opens and closes.
②整体装置的系统安装②System installation of the overall device
按照图7所示的结构,实施井下作业和安装。According to the structure shown in Figure 7, downhole operations and installation are carried out.
③实施低频变压操作③Implement low-frequency transformation operation
在注气后期,产出井大量见气,形成气窜后,可暂时关闭注气井和生产井,停止注入过程。在未形成气窜或少量产出气体时,即实施低频变压操作的增油效果更佳。In the late stage of gas injection, a large amount of gas is seen in the production wells, and after gas channeling is formed, the gas injection and production wells can be temporarily closed to stop the injection process. When there is no formation of gas channeling or a small amount of produced gas, that is, the implementation of low-frequency variable pressure operation has a better oil-increasing effect.
执行上述设计方案:Carry out the above design plan:
首先,地面控制电磁气控阀门开启,则在现有地层压力的作用下,油藏内气体快速进入高压容器、经过通气套筒进入上部环空空间内。通常较短时间内(1h)气体即充满上述空间,压力稳定分布,底部压力保持地层流体压力10MPa。First, the ground control electromagnetic gas control valve is opened, and under the action of the existing formation pressure, the gas in the oil reservoir quickly enters the high-pressure vessel, and enters the upper annulus space through the vent sleeve. Usually in a short period of time (1h), the gas fills the above-mentioned space, the pressure is distributed stably, and the bottom pressure maintains the pressure of the formation fluid at 10MPa.
其次,外部地面控制装置控制动力气注入,并保持动力气排出口通大气。此时气体增压机组开始工作,工作时间长,总时长为6天,地面程序控制机组休息时段。工作过程中,上部环空内气体进入高压容器内,内部气体压力不断升高。与此同时,油藏内气体流入上部环空,气体压力小幅降低,由于地层气体注入量远远大于环空内体积,故压力变化较小,此过程是油藏排出气体过程,压力变化见排出压力线。Secondly, the external ground control device controls the injection of power gas and keeps the power gas outlet open to the atmosphere. At this time, the gas booster unit starts to work, the working time is long, the total time is 6 days, and the ground program controls the rest period of the unit. During the working process, the gas in the upper annulus enters the high-pressure vessel, and the internal gas pressure continues to rise. At the same time, the gas in the reservoir flows into the upper annulus, and the gas pressure decreases slightly. Because the gas injection volume of the formation is much larger than the volume in the annulus, the pressure change is small. This process is the process of gas discharge from the reservoir, and the pressure change is seen as the discharge Pressure line.
再次,当外部地面控制装置监测高压容器内压力达到47MPa时,地面控制关闭电磁气控阀门,此时上部空间气体与下部油层附近气体隔离开来。高压气体增压机组继续工作,直至高压容器内压力达到50MPa时,高压容器内定压阀门开启,高压气体高速进入地层,造成近井地带高压,改变之前形成的剩余油分布状态。与此同时,地面自控系统关闭动力气注入,则增压机组停止工作。Third, when the external ground control device monitors that the pressure in the high-pressure vessel reaches 47 MPa, the ground control closes the electromagnetic gas control valve, and the upper space gas is isolated from the gas near the lower oil layer. The high-pressure gas booster unit continues to work until the pressure in the high-pressure vessel reaches 50MPa, the constant-pressure valve in the high-pressure vessel opens, and the high-pressure gas enters the formation at high speed, causing high pressure near the well and changing the previously formed remaining oil distribution. At the same time, the ground automatic control system shuts off the power gas injection, and the booster unit stops working.
最后,在高压容器内气体压力与井底流体压力持平时(约小于1h),高压容器定压阀关闭,注入升压过程结束。Finally, when the gas pressure in the high-pressure container is equal to the pressure of the fluid at the bottom of the well (about less than 1 h), the constant pressure valve of the high-pressure container is closed, and the injection and boosting process ends.
以上操作完成了1个频次的变压过程。若需要再次实施,重复上述步骤即可。The above operations have completed a frequency transformation process. If you need to implement it again, repeat the above steps.
④继续注气过程④Continue the gas injection process
低频变压井井筒装置停止工作的状态下,原来的注气及产出井继续工作,在一定阶段内,产出井将有一定幅度的增油,且气油比大幅下降,该过程也正是提高采收率的关键阶段。When the low-frequency variable pressure well bore device stops working, the original gas injection and production wells continue to work. Within a certain period, the production wells will increase oil to a certain extent, and the gas-oil ratio will drop significantly. The process is also positive. It is the key stage to improve the recovery factor.
基于同一发明构思,本发明实施例中还提供了一种孔隙内剩余油的低频变压油藏开采系统,如下面的实施例所述。由于孔隙内剩余油的低频变压油藏开采系统解决问题的原理与孔隙内剩余油的低频变压油藏开采方法相似,因此孔隙内剩余油的低频变压油藏开采系统的实施可以参见孔隙内剩余油的低频变压油藏开采方法的实施,重复之处不再赘述。Based on the same inventive concept, the embodiments of the present invention also provide a low-frequency variable pressure oil reservoir production system with remaining oil in the pores, as described in the following embodiments. Since the problem-solving principle of the low-frequency variable pressure reservoir production system for the remaining oil in the pores is similar to that of the low-frequency variable pressure reservoir production method for the remaining oil in the pores, the implementation of the low-frequency variable pressure reservoir production system for the remaining oil in the pores can be found in the pore The implementation of the low-frequency variable pressure reservoir production method for the remaining oil in the interior, the repetition will not be repeated.
该孔隙内剩余油的低频变压油藏开采系统包括:低频变压井井筒装置、数据分析装置、采油装置;The low-frequency variable pressure oil reservoir production system of the remaining oil in the pore includes: low-frequency variable pressure well borehole device, data analysis device, and oil production device;
其中,数据分析装置用于:获取气体在油藏内的分布图、注气过程中注采井间的压力分布图,根据所述气体在油藏内的分布图、注气过程中注采井间的压力分布图,确定低频变压井井筒装置在油藏内的放置位置;Among them, the data analysis device is used to: obtain the distribution map of the gas in the reservoir, the pressure distribution map between the injection and production wells during the gas injection process, and according to the distribution map of the gas in the reservoir, the injection and production wells during the gas injection process To determine the placement position of the low-frequency variable pressure well borehole device in the reservoir;
低频变压井井筒装置用于:放置在油藏内的相应位置,在油藏内的放置位置以预设的频率间歇地升高和降低压力,改变放置位置的油藏内的剩余油分布状态;The low-frequency variable pressure well borehole device is used to place it in the corresponding position in the oil reservoir, and the placement position in the oil reservoir to intermittently increase and decrease the pressure at a preset frequency, and to change the remaining oil distribution state in the reservoir at the placement position ;
采油装置用于:通过注汽井和采油井对改变了剩余油分布状态的油藏内的剩余油进行开采。The oil extraction device is used to extract the remaining oil in the reservoir that has changed the distribution of the remaining oil through steam injection wells and oil production wells.
在本发明实施例中,还包括:外部地面控制装置,用于对低频变压井井筒装置进行控制。In the embodiment of the present invention, it further includes: an external surface control device, which is used to control the wellbore device of the low-frequency variable pressure well.
本发明实施例还提供了一种计算机设备,包括存储器、处理器及存储在存储器上并可在处理器上运行的计算机程序,所述处理器执行所述计算机程序时实现上述所述方法。The embodiment of the present invention also provides a computer device including a memory, a processor, and a computer program stored in the memory and capable of running on the processor, and the processor implements the above-mentioned method when the computer program is executed.
本发明实施例还提供了一种计算机可读存储介质,所述计算机可读存储介质存储有执行上述所述方法的计算机程序。The embodiment of the present invention also provides a computer-readable storage medium, and the computer-readable storage medium stores a computer program for executing the above-mentioned method.
综上所述,1.本发明提出了能有效驱动孔隙内剩余油的低频变压油藏开发应用方法;提出的低频变压井井筒装置产生的高流速可以造成近井地带短时高压效果,实现剩余油的脱附和改变主渗流通道方向的作用;In summary, 1. The present invention proposes a low-frequency variable pressure reservoir development and application method that can effectively drive the remaining oil in the pore; the high flow rate generated by the proposed low-frequency variable pressure well bore device can cause short-term high pressure near the well zone, Realize the desorption of remaining oil and change the direction of the main seepage channel;
2.使用的低频变压井井筒装置充分利用已注入气体,无需反复注入气体及排出气体,其经济效益显著;2. The used low-frequency variable pressure well wellbore device makes full use of the injected gas, and does not need to inject and exhaust gas repeatedly, and its economic benefits are significant;
3.提出的低频变压井井筒装置中气体压缩过程无需人工干预;3. The gas compression process in the proposed low-frequency variable pressure well bore device does not require manual intervention;
4.该方法在气驱窜流后,通过扩大波及体积的方法,继续提高采出程度5%以上。4. This method continues to increase the recovery level by more than 5% by expanding the swept volume after the gas drive channeling.
本领域内的技术人员应明白,本发明的实施例可提供为方法、系统、或计算机程序产品。因此,本发明可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且,本发明可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。Those skilled in the art should understand that the embodiments of the present invention can be provided as a method, a system, or a computer program product. Therefore, the present invention may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.
本发明是参照根据本发明实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器,使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。The present invention is described with reference to flowcharts and/or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and/or block in the flowchart and/or block diagram, and the combination of processes and/or blocks in the flowchart and/or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing equipment to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing equipment are generated It is a device that realizes the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中,使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品,该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing equipment to work in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including the instruction device. The device implements the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上,使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理,从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。These computer program instructions can also be loaded on a computer or other programmable data processing equipment, so that a series of operation steps are executed on the computer or other programmable equipment to produce computer-implemented processing, so as to execute on the computer or other programmable equipment. The instructions provide steps for implementing the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.
以上所述仅为本发明的优选实施例而已,并不用于限制本发明,对于本领域的技术人员来说,本发明实施例可以有各种更改和变化。凡在本发明的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。The foregoing descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the embodiments of the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (18)

  1. 一种低频变压井井筒装置,其特征在于,由下至上包括:支撑封隔器、支撑短节、油层封隔器、通气套筒、高压容器、电磁气控阀门、气体增压机组和中空连杆,支撑封隔器、支撑短节、油层封隔器、通气套筒、高压容器、电磁气控阀门、气体增压机组和中空连杆位于套管内;A low-frequency variable pressure well wellbore device, which is characterized in that, from bottom to top, it includes: a support packer, a support short section, an oil layer packer, a vent sleeve, a high-pressure vessel, an electromagnetic gas control valve, a gas booster unit and a hollow Connecting rod, supporting packer, supporting sub-section, oil layer packer, vent sleeve, high pressure vessel, electromagnetic gas control valve, gas booster unit and hollow connecting rod are located in the casing;
    其中,支撑封隔器用于:涨开卡在套管内壁与支撑短节之间,对支撑短节进行支撑;Among them, the supporting packer is used to: expand the card between the inner wall of the casing and the supporting sub to support the supporting sub;
    支撑短节的下部与支撑封隔器相连,支撑短节的上部与油层封隔器相连,支撑短节为管状,管侧有孔眼,孔眼用于使下部油层内的气体通过进入油层封隔器;The lower part of the support pup joint is connected to the support packer, and the upper part of the support pup joint is connected to the oil layer packer. The support pup joint is tubular and has holes on the pipe side. The holes are used to allow the gas in the lower oil layer to pass into the oil layer packer. ;
    油层封隔器用于:隔断上部油层,使得气体在下部油层进出;The oil layer packer is used to: isolate the upper oil layer so that gas enters and exits in the lower oil layer;
    通气套筒的下部且外部与油层封隔器相连接,通气套筒的内部与高压容器连接,通气套筒的筒壁有通孔,为油层封隔器内的气体进入上部套管空间的通道;The lower part of the aeration sleeve and the outside are connected with the oil layer packer, the inside of the aeration sleeve is connected with the high-pressure vessel, and the cylinder wall of the aeration sleeve has through holes, which are the channels for the gas in the oil layer packer to enter the upper casing space ;
    电磁气控阀门通过通气套筒的通孔与通气套筒连接,用于通孔的打开和关闭,使得下部油层的气体进入高压容器和上部空间;The electromagnetic gas control valve is connected to the vent sleeve through the through hole of the vent sleeve, and is used to open and close the through hole, so that the gas in the lower oil layer can enter the high-pressure container and the upper space;
    高压容器的下端与通气套筒的内部连接,高压容器的上端与气体增压机组连接,高压容器为中空筒状;The lower end of the high-pressure container is connected with the inside of the vent sleeve, the upper end of the high-pressure container is connected with the gas booster unit, and the high-pressure container is in the shape of a hollow cylinder;
    气体增压机组用于将高压容器内的低压气体压缩成高压气体;The gas booster unit is used to compress the low-pressure gas in the high-pressure container into high-pressure gas;
    中空连杆的底部连接气体增压机组,中空连杆的顶部连接在外部地面控制装置上,用于使外部气体进入低频变压井井筒装置,使下部油层内的气体排出低频变压井井筒装置。The bottom of the hollow connecting rod is connected to the gas booster unit, and the top of the hollow connecting rod is connected to the external ground control device, which is used to make the external gas enter the low-frequency variable pressure well wellbore device, and the gas in the lower oil layer is discharged from the low-frequency variable pressure well wellbore device .
  2. 如权利要求1所述的低频变压井井筒装置,其特征在于,所述通气套筒的外部通过短节与油层封隔器相连接,所述通气套筒的内部与高压容器丝扣连接。The low-frequency variable pressure well wellbore device of claim 1, wherein the outside of the vent sleeve is connected with the oil layer packer through a short section, and the inside of the vent sleeve is threadedly connected with the high-pressure container.
  3. 如权利要求1所述的低频变压井井筒装置,其特征在于,所述高压容器的两端端盖为内嵌式,通过内嵌式连接气体增压机组和通气套筒;所述高压容器的外筒两端均为外丝扣,通过外丝扣与所述通气套筒的内部连接。The low-frequency variable pressure well wellbore device of claim 1, wherein the end caps at both ends of the high-pressure container are in-line, and the gas booster unit and the vent sleeve are connected through the in-line type; the high-pressure container Both ends of the outer cylinder are external threaded fasteners, which are connected to the inside of the vent sleeve through the external threaded fasteners.
  4. 如权利要求3所述的低频变压井井筒装置,其特征在于,所述高压容器包括定压阀门,所述高压容器的底部端盖在连接通气套筒后安装定压阀门,在定压阀门下方安装电磁气控阀门,定压阀门用于:在达到预设压力时开启,并保持持续开启状态,直至高压容器内外的流体压力平衡,再行关闭。The low-frequency variable pressure well wellbore device of claim 3, wherein the high-pressure container includes a constant-pressure valve, and the bottom end cap of the high-pressure container is installed with a constant-pressure valve after being connected to a vent sleeve. An electromagnetic air control valve is installed below, and the constant pressure valve is used to open when the preset pressure is reached, and keep it open until the fluid pressure inside and outside the high-pressure vessel is balanced, and then close.
  5. 如权利要求1、3或4所述的低频变压井井筒装置,其特征在于,所述高压容器包括多根,两两之间通过密封接箍连接。The low-frequency variable pressure well wellbore device according to claim 1, 3, or 4, wherein the high-pressure container includes a plurality of pieces, and the two are connected by a sealing coupling.
  6. 如权利要求5所述的低频变压井井筒装置,其特征在于,所述多根高压容器的内径不同,不同内径的高压容器之间通过密封变径接箍连接。The low-frequency variable pressure well wellbore device of claim 5, wherein the inner diameters of the multiple high-pressure containers are different, and the high-pressure containers with different inner diameters are connected by a sealed reducing coupling.
  7. 如权利要求1所述的低频变压井井筒装置,其特征在于,所述电磁气控阀门包括多个活塞式锥形堵头,所述活塞式锥形堵头为L型,所述多个活塞式锥形堵头通过多路通气接头连接;The low-frequency variable pressure well wellbore device of claim 1, wherein the electromagnetic pneumatic control valve includes a plurality of piston-type cone plugs, the piston-type cone plugs are L-shaped, and the plurality of Piston cone plugs are connected by multi-way vent joints;
    所述活塞式锥形堵头包括锥形堵头、连接杆、磁吸活塞、电磁块、L型框体;其中,所述锥形堵头、连接杆、磁吸活塞依次连接,连接杆、磁吸活塞和电磁块位于L型框体内;通过电磁块的通电有无带动磁吸活塞推动连接杆、锥形堵头,使得通气套筒中的通孔的打开和关闭。The piston-type cone plug includes a cone plug, a connecting rod, a magnetic piston, an electromagnetic block, and an L-shaped frame; wherein the cone plug, a connecting rod, and a magnetic piston are connected in sequence, and the connecting rod, The magnetic piston and the electromagnetic block are located in the L-shaped frame; the magnetic piston is driven to push the connecting rod and the conical plug by the energization of the electromagnetic block, so that the through hole in the vent sleeve is opened and closed.
  8. 如权利要求7所述的低频变压井井筒装置,其特征在于,所述高压容器中的通孔个数与所述活塞式锥形堵头的个数相同。The low-frequency variable pressure well wellbore device of claim 7, wherein the number of through holes in the high-pressure container is the same as the number of the piston cone plugs.
  9. 如权利要求1所述的低频变压井井筒装置,其特征在于,所述气体增压机组包括多个气体增压机并联,每个气体增压机的动力气出口和动力气入口位于上方,每个气体增压机的高压气出口位于下方,每个气体增压机的低压气入口位于外壁下方,并联的单台气体增压机的高压气出口、动力气出口和动力气入口均有汇集管,使气体增压机组同步工作。The low-frequency variable pressure well wellbore device of claim 1, wherein the gas booster unit comprises a plurality of gas boosters in parallel, and the power gas outlet and power gas inlet of each gas booster are located above, The high-pressure gas outlet of each gas booster is located below, the low-pressure gas inlet of each gas booster is located below the outer wall, and the high-pressure gas outlet, power gas outlet and power gas inlet of a single gas booster connected in parallel are collected Pipe, make the gas booster unit work synchronously.
  10. 如权利要求9所述的低频变压井井筒装置,其特征在于,还包括:连接保护套,用于将气体增压机包裹保护,并且起到与上下连接保护套连接的作用;The low-frequency variable pressure well wellbore device according to claim 9, further comprising: a connecting protective sleeve for wrapping and protecting the gas booster, and connecting with the upper and lower connecting protective sleeves;
    所述连接保护套的外壁位置上设置有低压气入口的开口,便于气体的进入;An opening for a low-pressure gas inlet is provided on the outer wall of the connecting protective sleeve to facilitate gas entry;
    所述连接保护套的顶部位置上设置有动力气出口和动力气入口的开口;The top position of the connecting protective sleeve is provided with openings for a power gas outlet and a power gas inlet;
    所述连接保护套的正下方设置有高压气出口的开口,便于与高压容器连接。An opening for a high-pressure gas outlet is provided directly below the connection protective sleeve, which is convenient for connection with a high-pressure container.
  11. 如权利要求1所述的低频变压井井筒装置,其特征在于,所述中空连杆的两头为配合的接头,一头为母扣接头,一头为公扣接头,中空连杆通过中间的通管使外部气体进入低频变压井井筒装置。The low-frequency variable pressure well wellbore device of claim 1, wherein two ends of the hollow connecting rod are mating joints, one end is a female buckle joint, the other is a male buckle joint, and the hollow connecting rod passes through the middle through pipe Make external air enter the low-frequency variable pressure well borehole device.
  12. 一种孔隙内剩余油的低频变压油藏开采方法,其特征在于,包括:A low-frequency variable pressure oil reservoir exploitation method for remaining oil in pores, which is characterized in that it comprises:
    获取气体在油藏内的分布图、注气过程中注采井间的压力分布图;Obtain the gas distribution map in the reservoir and the pressure distribution map between the injection and production wells during the gas injection process;
    根据所述气体在油藏内的分布图、注气过程中注采井间的压力分布图,确定权利要求1至11任一项所述的低频变压井井筒装置在油藏内的放置位置;According to the distribution map of the gas in the reservoir and the pressure distribution map between the injection and production wells during the gas injection process, determine the placement position of the low-frequency variable pressure well borehole device of any one of claims 1 to 11 in the reservoir ;
    采用低频变压井井筒装置在油藏内的放置位置以预设的频率间歇地升高和降低压力,改变放置位置的油藏内的剩余油分布状态;The placement position of the low-frequency variable pressure well borehole device in the reservoir is used to intermittently increase and decrease the pressure at a preset frequency to change the remaining oil distribution in the reservoir at the placement position;
    通过注汽井和采油井对改变了剩余油分布状态的油藏内的剩余油进行开采。Through steam injection wells and oil production wells, the remaining oil in the reservoir that has changed the distribution of the remaining oil is exploited.
  13. 如权利要求12所述的孔隙内剩余油的低频变压油藏开采方法,其特征在于,采用低频变压井井筒装置在油藏内的放置位置以预设的频率间歇地升高和降低压力,改变放置位置的油藏内的剩余油分布状态,包括:The low-frequency variable pressure reservoir production method of remaining oil in pores according to claim 12, characterized in that the placement position of the low-frequency variable pressure well borehole device in the reservoir is used to intermittently increase and decrease the pressure at a preset frequency. , Change the remaining oil distribution state in the reservoir at the placement position, including:
    通过外部地面控制装置控制电磁气控阀门开启,油藏内气体进入高压容器、经过通气套筒进入上部环空空间内;Through the external ground control device to control the opening of the electromagnetic gas control valve, the gas in the oil reservoir enters the high-pressure container, and enters the upper annulus space through the vent sleeve;
    通过外部地面控制装置控制动力气通过气体增压机组注入,保持气体增压机组的动力气出口通大气;The external ground control device controls the power gas to be injected through the gas booster unit to keep the power gas outlet of the gas booster unit open to the atmosphere;
    气体增压机组开始工作,上部环空空间内的气体进入高压容器内,气体压力升高,油藏内气体流入上部环空空间内;The gas booster unit starts to work, the gas in the upper annulus enters the high-pressure container, the gas pressure rises, and the gas in the oil reservoir flows into the upper annulus;
    当高压容器内的气体压力达到第一预设压力时,外部地面控制装置控制电磁气控阀门关闭,气体增压机组继续工作,直到高压容器内的气体压力达到第二预设压力时,高压容器内的定压阀门开启,高压气体进入油藏内,改变油藏内的剩余油分布状态;When the gas pressure in the high-pressure container reaches the first preset pressure, the external ground control device controls the electromagnetic gas control valve to close, and the gas booster unit continues to work until the gas pressure in the high-pressure container reaches the second preset pressure. The constant pressure valve inside opens, and high-pressure gas enters the reservoir, changing the remaining oil distribution in the reservoir;
    外部地面控制装置关闭动力气注入,在高压容器内气体压力与油藏内的流体压力持平时,高压容器定压阀关闭。The external ground control device closes the power gas injection. When the gas pressure in the high-pressure container is equal to the fluid pressure in the oil reservoir, the constant-pressure valve of the high-pressure container is closed.
  14. 一种孔隙内剩余油的低频变压油藏开采系统,其特征在于,包括:权利要求1至11任一项所述的低频变压井井筒装置、数据分析装置、采油装置;A low-frequency variable pressure oil reservoir production system for remaining oil in pores, characterized by comprising: the low-frequency variable pressure well wellbore device, data analysis device, and oil production device according to any one of claims 1 to 11;
    其中,数据分析装置用于:获取气体在油藏内的分布图、注气过程中注采井间的压力分布图,根据所述气体在油藏内的分布图、注气过程中注采井间的压力分布图,确定低频变压井井筒装置在油藏内的放置位置;Among them, the data analysis device is used to: obtain the distribution map of the gas in the reservoir, the pressure distribution map between the injection and production wells during the gas injection process, and according to the distribution map of the gas in the reservoir, the injection and production wells during the gas injection process To determine the placement position of the low-frequency variable pressure well borehole device in the reservoir;
    低频变压井井筒装置用于:放置在油藏内的相应位置,在油藏内的放置位置以预设的频率间歇地升高和降低压力,改变放置位置的油藏内的剩余油分布状态;The low-frequency variable pressure well borehole device is used to place it in the corresponding position in the oil reservoir, and the placement position in the oil reservoir to intermittently increase and decrease the pressure at a preset frequency, and to change the remaining oil distribution state in the reservoir at the placement position ;
    采油装置用于:通过注汽井和采油井对改变了剩余油分布状态的油藏内的剩余油进行开采。The oil extraction device is used to extract the remaining oil in the reservoir that has changed the distribution of the remaining oil through steam injection wells and oil production wells.
  15. 如权利要求14所述的孔隙内剩余油的低频变压油藏开采系统,其特征在于,还包括:外部地面控制装置,用于对低频变压井井筒装置进行控制。The low-frequency variable pressure reservoir production system for remaining oil in the pores of claim 14, further comprising: an external surface control device for controlling the low-frequency variable pressure well borehole device.
  16. 如权利要求15所述的孔隙内剩余油的低频变压油藏开采系统,其特征在于,低频变压井井筒装置具体用于:The low-frequency variable pressure oil reservoir production system for remaining oil in the pores of claim 15, wherein the low-frequency variable pressure well borehole device is specifically used for:
    通过外部地面控制装置控制电磁气控阀门开启,油藏内气体进入高压容器、经过通气套筒进入上部环空空间内;Through the external ground control device to control the opening of the electromagnetic gas control valve, the gas in the oil reservoir enters the high-pressure container, and enters the upper annulus space through the vent sleeve;
    通过外部地面控制装置控制动力气通过气体增压机组注入,保持气体增压机组的动力气出口通大气;The external ground control device controls the power gas to be injected through the gas booster unit to keep the power gas outlet of the gas booster unit open to the atmosphere;
    气体增压机组开始工作,上部环空空间内的气体进入高压容器内,气体压力升高,同时,油藏内气体流入上部环空空间内;The gas booster unit starts to work, the gas in the upper annulus enters the high-pressure container, the gas pressure rises, and at the same time, the gas in the oil reservoir flows into the upper annulus;
    当高压容器内的气体压力达到第一预设压力时,外部地面控制装置控制电磁气控阀门关闭,气体增压机组继续工作,直到高压容器内的气体压力达到第二预设压力时,高压容器内的定压阀门开启,高压气体进入油藏内,改变油藏内的剩余油分布状态;When the gas pressure in the high-pressure container reaches the first preset pressure, the external ground control device controls the electromagnetic gas control valve to close, and the gas booster unit continues to work until the gas pressure in the high-pressure container reaches the second preset pressure. The constant pressure valve inside opens, and high-pressure gas enters the reservoir, changing the remaining oil distribution in the reservoir;
    同时,外部地面控制装置关闭动力气注入,在高压容器内气体压力与油藏内的流体压力持平时,高压容器定压阀关闭。At the same time, the external ground control device closes the power gas injection. When the gas pressure in the high-pressure container is equal to the fluid pressure in the oil reservoir, the constant-pressure valve of the high-pressure container is closed.
  17. 一种计算机设备,包括存储器、处理器及存储在存储器上并可在处理器上运行的计算机程序,其特征在于,所述处理器执行所述计算机程序时实现权利要求12至13任一项所述方法。A computer device comprising a memory, a processor, and a computer program stored on the memory and running on the processor, wherein the processor implements the computer program described in any one of claims 12 to 13 when the processor executes the computer program.述方法。 Said method.
  18. 一种计算机可读存储介质,其特征在于,所述计算机可读存储介质存储有执行权利要求12至13任一项所述方法的计算机程序。A computer-readable storage medium, wherein the computer-readable storage medium stores a computer program for executing the method according to any one of claims 12 to 13.
PCT/CN2020/116982 2019-09-24 2020-09-23 Method, device, and system for low-frequency variable-pressure oil reservoir exploitation of remaining oil in pores WO2021057760A1 (en)

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