Abstract
Instability of borehole wall is a common phenomenon when drilling in complex strata, which bring great difficulties to drilling. Traditional way of casing pipe can isolate unstable borehole wall reliably, however, there are some shortcomings: for example, reducing hole-diameter etc. In order to seek a simple, effective and no diameter damage way for supporting collapsed well section, the project team devotes to research hot-melt way used in dry hole and polyurethane way used in hole with water. The paper elaborates process principle and indoor tests of the two ways in detail. Study indicate, the two kinds of nonmetal borehole wall strengthening technology have many advantages, like simple to operate, effect is significant and no diameter to diameter of borehole, which have certain application prospect.
Highlights
When drilling, maintaining the stability of the sidewall is one of the basic conditions to ensure normal drilling
In order to seek a simple, effective and no diameter damage way for supporting collapsed well section, the project team devotes to research hot-melt way used in dry hole and polyurethane way used in hole with water
The process principle and the traditional sidewall reinforcement technique are completely different. It mainly used in the dry hole, and the key techniques are the properties of the hot melt materials and the design of the high power heating unit
Summary
When drilling, maintaining the stability of the sidewall is one of the basic conditions to ensure normal drilling. The collapses of sidewall can result in burying drilling tools, delaying construction period and even abandoning the borehole, which will make a huge economic loss (Shi & Liu, 2004; Peng & Dou, 2010). The sidewall instability is a prevalent technical challenge in the process of drilling and has been plagued for a long time (Chen, 1981; Yang & Su, 2008). For minor collapse in the drilling process, generally through using the high quality mud won’t cause difficulties to drilling, but if drilling in broken and collapsed formation, in the short term, the sidewall will form a large-scale collapse and this situation is usually dealt with by supporting technologies of casing etc (Du & Hu, 1992; Chen & Sun, 2008). This paper will introduce two kinds of nonmetal sidewall strengthening technologies which have many advantages, like simple to operate, effect is significant and no damage to diameter of borehole
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