声频振动沉入套管工艺方法研究

Study on the Technology Method of Vibration Sinking Casing

松散软易坍塌地层常采用泥浆护壁方法,容易造成环境污染,而无水静压沉入套管存在深度不够等问题。本文研究采用声频振动沉入套管的工艺方法,介绍了声频振动沉管的工艺流程及施工步骤,开展了声频振动沉管场地试验,试验发现声频振动沉管速度在杂填土中最快,在软塑黏土层中次之,在细砂层中最慢,并通过计算套管受到的端阻力和侧阻力,得出钻机振动力在套管底部的衰减值,进而计算出沉入套管的理论极限深度。该工艺方法具有沉管速度快、施工工艺简单、无泥浆污染等特点,能够解决复杂地层的护壁问题,保证了钻探工程的施工进度和质量,为开展软土取样、环境污染场地调查及砂金矿勘探等应用项目奠定了基础。

Mud wall protection is often used in loose, soft and collapsible strata, which is easy to cause environmental pollution. However, there are some problems such as insufficient depth of anhydrous static pressure sinking into the casing. This paper studies the process method of sinking the casing with acoustic vibration, introduces the process flow and construction steps of acoustic vibration sinking, and carries out the field test of acoustic vibration sinking. The test shows that the speed of acoustic vibration sinking is the fastest in miscellaneous fill, the second in soft plastic clay layer and the slowest in fine sand layer. By calculating the end resistance and side resistance of the casing, the attenuation value of the drilling rig vibration force at the bottom of the casing is obtained, and then the theoretical limit depth of sinking into the casing is calculated. This process method has the characteristics of fast pipe sinking speed, simple construction process and no mud pollution. It can solve the wall protection problem of complex strata, ensure the construction progress and quality of drilling engineering, and lay a foundation for application projects such as soft soil sampling, environmental pollution site investigation and placer gold exploration.