Method and formula for plugging cracks, solution holes, hollow spaces, and pores on sub stratum

A technology for underground rock formations and pores, which is applied in cavities and pores to seal underground rock formation cracks and karst caves to achieve reliable sealing and reduce circulation loss.

Inactive Publication Date: 2007-12-26
SUZHOU SHARP ROCK ENERGY DEV TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these materials do not always form a reliable seal due to the complexity of downhole conditions

Method used

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  • Method and formula for plugging cracks, solution holes, hollow spaces, and pores on sub stratum

Examples

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Effect test

Embodiment Construction

[0025] Figure 1 illustrates one possible embodiment of the sealing composition 10 of the present invention that may be sealed around the drill string 14 above a subsurface opening 26 in a wellbore 12, such as a fracture 16, void, cavern or aperture. Where applicable, wellbore seals 28 include drillable packers, segmented seals sealed by packers and / or cement plugs, or utilize other suitable sealing methods.

[0026] As described below, the carrier fluid can be used to transport the filter material 24 to the opening 26, arrow 20 indicates the carrier fluid carrying the filter material 24, after the filter material 24 is brought to the opening 26, this forms the A filter mechanism or a bridge that partially closes the opening 26 but still allows the carrier fluid 30 indicated by arrow 30 to pass through the filter material 24 itself. The solid matter 22 loaded by the carrier fluid simultaneously with the filter substance 24 or after the filter substance will accumulate behind th...

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Abstract

This invention discloses a method for blocking cracks, dissolved caverns, cavities and pores in underground rock stratum. The formula comprises: a filtering substance, a solid and a carrying fluid. The filtering substance contains multiple fluid-flowing channels that run through the filtering substance. The solid is used for blocking the fluid-flowing channels. The carrying fluid is used for carrying the filtering substance and/or the solid in the openings of cracks, dissolved caverns, cavities and pores in underground rock stratum. When the carrying fluid carrying the filtering substance into the opening, a bridge is generated to partly block the opening while still supply fluid-flowing channels. The solid and/or solidifiable fluids are introduced into the fluid-flowing channels of the filtering substance, where the solid and/or solidifiable fluid accumulate and form a sealing structure. With the formula, the openings at the wellbore section can be sealed.

Description

technical field [0001] The invention relates to general oil and natural gas drilling, in particular to a method and formula for plugging cracks, caves, cavities and pores in underground rock formations. Background technique [0002] During the drilling process or well completion process, under certain pressure, the fluid in the wellbore can leak into the formation through openings such as fractures, caves, cavities or pores. Formed by artificially induced fractures caused by abnormal wellbore pressure. Drilling fluids are usually very expensive, so it is undesirable to lose such fluids in the "circulation loss zone", and for many reasons well known to those skilled in the art, the circulation of drilling fluids is important, therefore, plugging fractures, caves, Voids and porosity are essential for the drilling process to continue. [0003] Previously, fibrous, flake and granular LCC materials have been applied to well drilling to create the required plugging. For example...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/42
Inventor 王玲
Owner SUZHOU SHARP ROCK ENERGY DEV TECH
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