An automatic control system for throttling and well killing, which can control the throttling and circulating pressure automatically. In this system, the manual three position four way valve and electric three position four way valve in parallel, and the output end of the oil hydraulic throttle valve connected to control electric three position four way valve end, vertical pressure sensor, a pressure sensor, the pit level sensor and valve opening sensor is connected with the computer. Wells design software running into the system, with the shut in vertical pressure, shut in casing pressure and mud pool incremental data, to optimize the design of pressure wells construction plan, get the pressure well construction pressure control curve; wells cycle, computer real-time acquisition of vertical pressure, casing pressure, mud pool increase and the valve opening data, and the vertical pressure control curve were compared, and calculate the vertical pressure control pressure, casing pressure and differential pressure control valve opening; according to the automatic control switch of hydraulic throttle valve the system parameters, adjusting the size of the wellhead back pressure, to achieve automatic control of the throttle pressure wells cycle. The figure shows: 1. 2. sets of vertical pressure sensor, pressure sensor, 3. pressure wells, 4. drill string, 5. wells, 6. annulus, 7. manifold, 8. vertical pressure table, 9. sets of pressure gauge, 10. valve opening, 11. manual three position four way valve, 12. throttle control box 13., valve position sensor, 14. hydraulic throttle valve, manual throttle valve 15., 16. discharge pipeline, 17. electric three position four way valve, 18. computers, 19. mud pools, 20. pit level sensor.
【技术实现步骤摘要】
本专利技术涉及石油天然气钻井过程中发生溢流后节流循环压井的自动控制装置,该节流压井自动控制系统能按压井施工设计自动控制节流循环压力。
技术介绍
目前,在压井施工过程中,控制地层压力,防止二次溢流的手段是靠地面节流管汇上节流阀产生的井口回压来控制地层压力。操作过程有两种一是手动控制节流阀;二是通过节流控制箱上的液控装置来控制液动节流阀。两种方法的本质是一样的,即人工手动控制节流阀开度,调节井口回压,实现对地层压力的控制。由于司钻操作水平的差异和立压滞后等因素的影响,节流压井操作时易引起井下压力波动,影响压井成功率。在非常规压井条件下,由于压井施工与井口条件、井下条件、地层特性和压井方法密切相关,压井施工尚无统一的标准和施工控制曲线,因此,节流压井操作对压井的成功与否受手动操作和人员因素的影响就更大,往往由于操作的原因不能有效地实施压井施工方案,从而导致压井失败。
技术实现思路
为了克服现有节流管汇手动操作节流阀引起井下压力波动,造成井底压力减小,产生二次溢流,影响压井成功率的问题,本专利技术提供一种节流压井自动控制系统。运行嵌入节流压井自动控制系统的压井设计软件,用发生溢流后所取得的关井立压、关井套压和泥浆池增量等数据,对压井作业施工方案进行优化设计,得到常规或非常规压井施工立压控制曲线;根据压井施工立压控制曲线,运行嵌入节流压井自动控制系统的节流压井控制软件,实时采集立管压力、套管压力、泥浆池增量和节流阀阀位开度数据,并计算出立压控制压差、套压控制压差和节流阀阀位开度等参数;根椐这些参数节流压井自动控制系统自动控制液动节流阀的开关,调节井口回压的大小,实现 ...
【技术保护点】
一种节流压井自动控制系统,钻柱上的立压传感器、节流管汇前端的套压传感器、泥浆池液面传感器和液动节流阀上的阀位传感器与计算机中数据采集板的接口相连,立压传感器、套压传感器和阀位传感器分别与节流控制箱上的立压表、套压表和阀位开度表相连,电动三位四通阀的控制端与计算机中A/D转换器的输出接口相连,电动三位四通阀和手动三位四通阀的油路输出端与液动节流阀相连,计算机中安装压井设计软件和节流压井控制软件,其特征是:运行压井设计软件得到压井施工立压控制曲线,运行节流压井控制软件自动采集立压传感器、套压传感器、泥浆池液面传感器和阀位传感器输出的数据,并与立压控制曲线比较,计算得到立压控制压差、套压控制压差和节流阀阀位开度,计算机输出指令,驱动电动三位四通阀开关,调节井口回压,实现对节流压井循环压力的自动控制。
【技术特征摘要】
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