Variable density drilling mud

A technology for drilling mud and density, which is applied in the direction of earthwork drilling, drilling composition, wellbore/well components, etc., and can solve the problem that the number of casing strings cannot be reduced

Inactive Publication Date: 2007-06-06
EXXONMOBIL UPSTREAM RES CO
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, solid expandable liners do not reduce the number of casing strings required

Method used

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  • Variable density drilling mud
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Embodiment Construction

[0026] [025] In the following detailed description and examples, the invention will be illustrated in conjunction with preferred embodiments. However, the extents described below are for specific embodiments or uses of the invention and are illustrative only. Therefore, the invention is not limited to the specific examples hereinafter, but on the contrary, the invention includes all alternatives, modifications and equivalents falling within the true scope of the appended claims.

[0027] [026] Figure 1 illustrates a typical pore pressure gradient curve 1 and a fracture pressure gradient curve 3 with depictions of conventional casing setpoints 5. For a given casing set point, the mud specific gravity 7 is set so that it is higher than the pore pressure gradient curve 1 but lower than the fracture pressure gradient curve 3. Casing set point 5 allows for an increased open hole minimum fracture pressure gradient so that higher mud gravities can be used in the wellbore.

[0028][...

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Abstract

One embodiment of the invention is a variable density drilling mud comprising compressible particulate material in the drilling mud wherein the density of the drilling mud changes in response to pressure changes at depth. A second embodiment is a method for varying drilling mud density. The method comprises estimating the pore pressure and fracture gradient, and choosing a drilling mud with compressible materials wherein the effective mud weight of the drilling mud remains between the pore pressure and the fracture gradient in at least one interval of the well bore. A third embodiment is an apparatus for drilling a wellbore.

Description

[0001] related application [0002] [001] This application claims priority to US Application Serial No. 60 / 580,523, filed June 17,2004. technical field [0003] [002] This patent relates generally to subterranean boreholes. More specifically, this patent relates to drilling muds and methods and apparatus for reducing or eliminating the need to case a wellbore. Background technique [0004] [003] Traditionally, when a wellbore is formed, a large number of casings are installed in the wellbore to prevent the borehole wall from collapsing and to prevent the undesired seepage of drilling fluids into or from the formation into the wellbore. Wellbores are typically drilled in stages whereby casing (such as steel pipe) installed in a lower section of the wellbore is lowered into place through casing previously installed in a higher section of the wellbore. As a result of this process, the diameter of the lower casing is smaller than the diameter of the upper casing. Thus, the sl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/04
CPCE21B21/08C09K8/02C09K8/03C09K8/14C09K8/16
Inventor R·S·波利佐蒂M·D·埃尔塔什N·M·波库特洛维茨S·T·米尔纳J·R·里格比J·蒙哥马利P·B·昂切夫S·R·凯勒V·古普塔W·J·西萨
Owner EXXONMOBIL UPSTREAM RES CO
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