冯进, 迟少林, 张慢来, 陈维, 黄新宇. 井下震源发生器优化设计[J]. 石油钻探技术, 2020, 48(5): 120-126. DOI: 10.11911/syztjs.2020117
引用本文: 冯进, 迟少林, 张慢来, 陈维, 黄新宇. 井下震源发生器优化设计[J]. 石油钻探技术, 2020, 48(5): 120-126. DOI: 10.11911/syztjs.2020117
FENG Jin, CHI Shaolin, ZHANG Manlai, CHEN Wei, HUANG Xinyu. Optimal Design of a Downhole Seismic Generator[J]. Petroleum Drilling Techniques, 2020, 48(5): 120-126. DOI: 10.11911/syztjs.2020117
Citation: FENG Jin, CHI Shaolin, ZHANG Manlai, CHEN Wei, HUANG Xinyu. Optimal Design of a Downhole Seismic Generator[J]. Petroleum Drilling Techniques, 2020, 48(5): 120-126. DOI: 10.11911/syztjs.2020117

井下震源发生器优化设计

Optimal Design of a Downhole Seismic Generator

  • 摘要: 针对随钻地震强度低、不利于井眼间防碰监测的问题,设计了一种蓄能式井下震源发生器。该发生器主要由活塞、弹簧、冲锤、铁砧和延时装置等组成,通过钻井液蓄能获得高效冲击功。为使其获得最佳输出性能,以冲锤为研究对象,建立了井下震源发生器冲锤流道模型,基于CFD动网格技术,利用CFD软件分析了弹簧刚度、冲锤质量、节流面积、出口直径和数量等设计参数及钻井液密度对井下震源发生器输出性能参数的影响规律,分析得知:节流面积、出口数量、出口直径和钻井液密度与井下震源发生器输出性能参数呈正相关关系;弹簧刚度越大,冲锤最大冲击功对应的位移越小;冲锤的质量越大则速度越小。基于单因素分析结果,以冲锤冲击功为优化目标,利用正交试验优选了设计参数组合方案。研究结果表明:各设计参数对井下震源发生器输出性能的影响不尽相同;出口直径和弹簧刚度对井下震源发生器输出性能的影响极为显著,节流面积、冲锤质量和出口数量对井下震源发生器输出性能的影响显著,而钻井液密度的影响不显著。根据研究结果筛选出了各设计参数水平的最优组合,研究结果还可以为井下震源发生器的设计提供依据。

     

    Abstract: Aiming at the problem of low seismic intensity while drilling, which is detrimental to the anti-collision monitoring between boreholes, an energy storage downhole seismic generator was designed.This generator is composed primarily of a piston, spring, impact hammer, anvil and a delay device. It was able to achieve high efficiency impact by means of the energy storage of drilling fluid. In order to achieve the optimal performance, taking the impact hammer as research object, the impact hammer flow passage model of downhole seismic generator was established. With the CFD software, the influence law on the output performance parameters of downhole seismic generator brought by the spring stiffness, impact hammer mass, throttling area, the outlet diameter, quantity and drilling fluid density were analyzed based on the CFD dynamic grid technology. The results showed that the throttling area, number of outlets, outlet diameter and drilling fluid density were positively correlated with the output performance parameters of downhole seismic generator. The greater the spring stiffness, the smaller the displacement corresponding to the maximum impact energy of the impact hammer. Correspondingly, the greater the mass of the impact hammer, the lower the velocity. Based on the results of single factor analysis, and by taking the impact energy of impact hammer as the optimization target, the optimal combination of design parameters was obtained by the orthogonal test. The results indicated that each design parameter had its unique effect on the output performance of downhole seismic generator. While the outlet diameter and spring stiffness play a prominent role on the output performance of the generator, the throttling area, hammer mass and number of outlets have a significant role on it, and the influence of drilling fluid density is not significant.Thus, the optimal combination of design parameters was selected based on the research results, which can provide a basis for the design of downhole seismic generator.

     

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