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产品展厅>>产品销售>>辰工开发系列软件>>辰工注水井测调仪

注水井分层流量调配软件是注够水、注好水的重要保障,由于注水井流量调配涉及到井筒贯流、水嘴节流和地层渗流的耦合,同时各注水层的地层参数不同、地质要求的配注量也不相同,必须使用不同的尺寸的水嘴来进行调节,注水井高效测调仪就根据上述原理研制而成。

在注水井垂直管流计算方面:采用井筒中能量守恒方程,建立各水嘴前压力和流量之间的关系,结合水嘴的嘴损曲线及地层瞬态吸水指示曲线,得到井筒中不同位置处的耦合方程组,通过迭代求解可计算出各层水嘴尺寸。

在水管节流计算方面:充分考虑不同水嘴结构,利于水嘴流动的N-S方程开展数值求解研究,最终归纳出不同尺寸水嘴嘴前嘴后压差与注水量之间的关系(即嘴损曲线)。

在地层渗流方面:根据不同的地址条件,建立均质、双孔、双渗及复合油藏的渗流方程、同时考虑不同的边界条件(如断层、河道形油藏、U-形油藏)。

 辰工注水井分层流量调配软件:从注水井井口至地层,其流动过程主要包括注水井油管内管流、注水井经过配水器的嘴流和地层渗流三个基本的流动过程,本软件使用垂直管流、水嘴节流及地层渗流耦合方程,实现以下功能:

各层极限注入量的计算:根据地层渗透性、水质、射孔段、地层破裂压力等情况,计算最佳注入量及井口压力等随时间变化曲线;

各层注水量计算:在给定井口压力和各层水嘴规格的情况下预测各层实际注水量,为地质部门设计和调配班组施工提供定量的依据;

水嘴智能选择:根据给定的井口压力和各层设计注水量,自动选择合适的水嘴,大大减少调配时间和工作强度。还能在满足配注方案误差要求的前提下尽可能的降低井口压力,减少能耗和管柱磨损; 

注水量衰减规律计算:注水时随着地层压力的升高,注入量不断减少,地质部门可根据衰减规律选择合适的调配周期,保证注水效果。

注水井流量调配仪:为方便现场使用,在流量调配软件基础上集成微型打印机等设备,形成流量调配仪。以前由于没有分层注水的调配理论和方法,工人凭经验更换水嘴,不断试凑,效率很低,调配一口井需要4-6天,并且更换一层的水嘴也会改变其它层的注入量,在层数较多时很难调好所有层。该仪器在大庆油田使用,从而使调配时间降低到平均每井2.5天。

图1 第一次注水井不同时间下井底压力与注入量曲线 图2 极限流量随时间变化曲线 图3 高效测调仪整体外观 图4 高效测调仪内部外观

Products>>Products on Sale>>Chengong Development Software Series>>Chengong Injection Well Measuring and Adjusting  Instrument

The stratification flow allocation software of water injection well is an important guarantee for enough water injection and good water injection. Because the flow allocation of water injection well involves the coupling of wellbore tubular flow, nozzle throttling and formation seepage, at the same time, the formation parameters of each water injection formation are different, and the amount of geological requirement is also different, so the  different sizes of water nozzles must be used to adjust. The high efficiency measuring/adjusting instrument of water injection well is developed according to the above principles.

In the calculation of vertical pipe flow in water injection well, the relationship between pressure and flow rate before each nozzle is established by using energy conservation equation in wellbore. Combined with nozzle loss curve and formation transient water absorption indication curve, the coupling equations at different positions in wellbore can be obtained, and the nozzle size of each formation can be calculated by iterative solution.

In the aspect of water pipe throttling calculation: By fully considering the different water  nozzle structures, the N - S equation which is benefits to water nozzle flow is utilized to develop numerical simulation solution. Finally, the relationship between the pressure difference between the front and back nozzle of different sizes and the water injection amount (that is, the nozzle loss curve) is summarized.

In the aspect of formation seepage: According to different geological conditions, the seepage equations of homogeneous, duo-porosity/permeability and composite reservoirs are  established, and different boundary conditions (such as faults, channel reservoirs, U-shaped reservoirs) are considered.

Chengong stratification flow allocation software of injection well: from injection wellhead to formation, the flow process of water injection well mainly includes three basic flow processes: Pipeline flow in water injection well, nozzle flow through water distributor and formation seepage. This software uses vertical pipe flow, nozzle throttling and formation seepage coupling equation to realize the following functions:

The calculation of the limit injection amount of each layer: According to the formation permeability, water quality, perforation section, formation fracture pressure and so on, calculate the optimal injection amount, wellhead pressure and so on with time variation curve;

Water injection calculation of each layer: Under the condition of given wellhead pressure and nozzle specification of each layer, the actual water injection quantity of each layer is predicted, which provides a quantitative basis for the design and allocation of team construction in geological departments;

Intelligent selection of nozzle: According to the given wellhead pressure and the design of water injection quantity in each layer, the appropriate nozzle is selected automatically, which greatly reduces the allocation time and working intensity. It  can also reduce wellhead pressure, energy consumption and pipe damage as much as possible under the premise of meeting the requirement of the error of injection allocation scheme.

Calculation of water injection attenuation law: in water injection, with the increase of formation pressure, the injection volume decreases continuously, and the geological department can select the appropriate allocation period according to the attenuation law to ensure the effect of water injection.

Water injection well flow adjuster: in order to facilitate field use, micro printer and other equipment are integrated on the basis of flow allocation software to form flow adjuster. In the past, because there was no theory and method of stratified water injection, the workers changed the nozzle by experience, the test is complex so the efficiency was very low. It took 4 to 6 days to deploy a well, and replaced the nozzle of one layer would also change the injection amount of other layers, so it was difficult to adjust all layers when the number of layers was large. The instrument is used in Daqing Oilfield, so that the deployment time is reduced to an average of 2.5 days per well.

Figure1: Curve of bottom hole pressure and injection volume at different time in  the first injection well Figure2: Curve of limit flow over time Figure3: Overall appearance of high efficiency measuring and  adjusting instrument Figure4: Internal appearance of high efficiency measuring and adjusting instrument