水平井防砂管理理念.pptVIP

Sand Management in Open Hole Horizontal Wells水平井防砂管理理念 Sand Management Techniques防砂技术 Stand Alone Screens优质筛管防砂 Open Hole Gravel Packing裸眼砾石充填防砂 Cased Hole Gravel Packing套管井砾石充填防砂 – Acid Pre-Packing酸预处理充填工艺 – High Rate Water Pack (HRWP)高速水充填防砂 Frac Packing压裂充填防砂 Criteria in Choosing a Sand Control Technique选择防砂方式的标准 Borehole Stability 井眼稳定性 Formation Permeability 地层渗透率 Clay Fines Content 粘土矿物组分 Grain Sorting Uniformity 颗粒分布及均一性 Number of Silt and Clay intervals exposed to Open Hole Sections 裸眼段泥岩段和粉砂段的长度 Stand Alone Screen – Types 5%.裸眼筛管防砂 Stand Alone Screen - SAS光筛管防砂 SAS should be used in:适用范围： Clean (low fines content) homogeneous sands with high net to gross pay and uniformly sorted large grains with D50 greater than 200 μm. 油层厚度较厚，且颗粒分选好（ D50大于200 μm）的单一均质砂岩 SAS should NOT be used : For D50 less than 200 μm grain size uniformity and fines content must be considered. If grains are poor sorted and non-uniform and the fines content is greater than 5%. D50 小于200 μm的均质油层要考虑细粉砂的含量 。如果颗粒筛选性差或非均质性或细粉砂的含量 大于5%的地层不适合用光筛管防砂. Stand Alone Screen - SAS光筛管防砂 SAS should NOT be used on: Wells in weakly consolidated sandstones with small grains and a high percentage of dispersed fines and clays – particles less than 44 μm. 直径小于44 μm的细颗粒和分散的粉砂岩和泥岩颗粒含量较高的弱胶结砂岩的井 SAS should NOT be used on: Wells in dirty (high fines content) or non-homogeneous unconsolidated formations with low permeability and poorly sorted, small grains - D50 about 80 μm. 渗透率低、分选差且颗粒直径较小（D50 在 80 μm以下）的粉砂含量高或非均质的疏松地层 Stand Alone Screen - SAS光筛管防砂 Initial production is usually high However, productivity drops as formation solids plug the screens.最初的产能一般会比较高，但是，随着地层砂堵塞筛管，产能就会降低 The SAS is not cushioned by sand – Hence it is exposed to a higher flow rate per unit length – This results in high velocity erosion of the screen surface and eventual screen rupture SAS没有缓冲层，因此单位长度的流动速率较高，这会加速筛管表面的冲蚀速率，最终导致筛管破裂 Most SAS in the GOM last only 3 years**** 大部分的SAS在G