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            產品展廳>>產品銷售>>辰工開發系列軟件>>辰工注水井測調儀

            注水井分層流量調配軟件是注夠水、注好水的重要保障,由于注水井流量調配涉及到井筒貫流、水嘴節流和地層滲流的耦合,同時各注水層的地層參數不同、地質要求的配注量也不相同,必須使用不同的尺寸的水嘴來進行調節,注水井高效測調儀就根據上述原理研制而成。

            在注水井垂直管流計算方面:采用井筒中能量守恒方程,建立各水嘴前壓力和流量之間的關系,結合水嘴的嘴損曲線及地層瞬態吸水指示曲線,得到井筒中不同位置處的耦合方程組,通過迭代求解可計算出各層水嘴尺寸。

            在水管節流計算方面:充分考慮不同水嘴結構,利于水嘴流動的N-S方程開展數值求解研究,最終歸納出不同尺寸水嘴嘴前嘴后壓差與注水量之間的關系(即嘴損曲線)。

            在地層滲流方面:根據不同的地址條件,建立均質、雙孔、雙滲及復合油藏的滲流方程、同時考慮不同的邊界條件(如斷層、河道形油藏、U-形油藏)。

            辰工注水井分層流量調配軟件:從注水井井口至地層,其流動過程主要包括注水井油管內管流、注水井經過配水器的嘴流和地層滲流三個基本的流動過程,本軟件使用垂直管流、水嘴節流及地層滲流耦合方程,實現以下功能:

            各層極限注入量的計算:根據地層滲透性、水質、射孔段、地層破裂壓力等情況,計算最佳注入量及井口壓力等隨時間變化曲線;

            各層注水量計算:在給定井口壓力和各層水嘴規格的情況下預測各層實際注水量,為地質部門設計和調配班組施工提供定量的依據;

            水嘴智能選擇:根據給定的井口壓力和各層設計注水量,自動選擇合適的水嘴,大大減少調配時間和工作強度。還能在滿足配注方案誤差要求的前提下盡可能的降低井口壓力,減少能耗和管柱磨損;

            注水量衰減規律計算:注水時隨著地層壓力的升高,注入量不斷減少,地質部門可根據衰減規律選擇合適的調配周期,保證注水效果。

            注水井流量調配儀:為方便現場使用,在流量調配軟件基礎上集成微型打印機等設備,形成流量調配儀。以前由于沒有分層注水的調配理論和方法,工人憑經驗更換水嘴,不斷試湊,效率很低,調配一口井需要4-6天,并且更換一層的水嘴也會改變其它層的注入量,在層數較多時很難調好所有層。該儀器在大慶油田使用,從而使調配時間降低到平均每井2.5天。

            圖1 第一次注水井不同時間下井底壓力與注入量曲線 圖2 極限流量隨時間變化曲線 圖3 高效測調儀整體外觀 圖4 高效測調儀內部外觀

            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
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