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介绍了水平井和多底井的多种变化形式及其潜在优势。总结出一些规律,认为直井适合于比较厚的煤层气储层,如在SanJuan盆地所发现的储层,而水平井和多底井则适用于比较薄的储层。最近,一些作业公司正在钻一批水平井和多底井(包括在比较厚的储层),并宣布在经济上获得成功。介绍了不同厚度、不同特性的煤层气储层中最合适的钻井方式。所研究的储层特性包括气体含量、渗透率、解吸附特性。用于衡量不同井身结构的标准是净现值(NPV)。将不同的水平井和多底井的井身结构彼此进行对比,计算其钻井费用。此外,还对双分支、三分支、四分支及鱼骨状(也称为羽状)井身结构进行对比。对于这些井身结构,研究了水平段总长度及各分支间距(SBL)的影响。
Various variations of horizontal and multi-well wells and their potential benefits are introduced. Some generalizations are concluded that vertical wells are suitable for thicker CBM reservoirs, such as those found in the SanJuan Basin, while horizontal and multi-bottom wells are suitable for relatively thin reservoirs. Recently, some operating companies are drilling a number of horizontal and multi-well wells (including in thicker reservoirs) and announced the economic success. The most suitable drilling method for CBM reservoirs with different thicknesses and different characteristics is introduced. The reservoir properties studied include gas content, permeability, and desorption characteristics. The standard used to measure different wellbore structures is net present value (NPV). The wellbore structures of different horizontal wells and multi-bottom wells are compared with each other to calculate their drilling costs. In addition, a comparison of bifurcated, three-branched, four-branched and fishbone (also known as pinnate) wellbore structures is also provided. For these wellbore structures, the effect of the total length of the horizontal section and the spacing of the branches (SBL) was studied.