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Slurry in use for directional drilling into clay band layer in horizontal

A horizontal orientation, clay layer technology, applied in the direction of drilling equipment, etc., can solve the problems of cuttings removal and transportation, loss of fluidity, hole collapse, etc., and achieve the effects of well wall stability, strong suspension force and high drilling speed

Inactive Publication Date: 2005-01-12
大庆油田建设集团
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the mud used in the horizontal directional drilling process is composed of bentonite and water. The viscosity and shear force of the single-component mud are too high. During the drilling process, when the drill bit passes through the clay, or through loose, When the mud and shale layers are easy to hydrolyze and disperse or make slurry, the drilled cuttings will quickly disperse into fine particles and suspend in the mud. At this time, the density of the mud increases, and the viscosity shear force rises sharply, making the mud more and more The thicker it is or even completely loses its fluidity, the drilled and crushed cuttings cannot be removed and transported outside the hole in a timely and effective manner, so that hole collapse and drill sticking are prone to occur during drilling, back-expanding and back-dragging

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1, each component and content of the mud of this horizontal directional drilling into clay layer are as follows: bentonite 45Kg / m 3 , soda ash 2.0Kg / m 3 , Hydrolyzed polyacrylonitrile 3.1Kg / m 3 , white oil lubricant 3.2Kg / m 3 , and the balance is water. This scheme was tested during the crossing project of the "West-to-East Gas Pipeline" pipeline, and no hole collapse or stuck drill occurred, ensuring smooth drilling.

Embodiment 2

[0021] Embodiment 2, each component and content of the mud of this horizontal directional drilling into clay layer are as follows: bentonite 50Kg / m 3 , soda ash 1.8Kg / m 3 , Hydrolyzed polyacrylonitrile 2.8Kg / m 3 , white oil lubricant 3.0Kg / m 3 , and the balance is water. This scheme was tested during the crossing project of the "West-to-East Gas Pipeline" pipeline, and no hole collapse or stuck drill occurred, ensuring smooth drilling.

Embodiment 3

[0022] Embodiment 3, each component and content of the mud of this horizontal directional drilling into clay layer are as follows: Bentonite 55Kg / m 3 , soda ash 1.6Kg / m 3 , Hydrolyzed polyacrylonitrile 2.6Kg / m 3 , white oil lubricant 2.8Kg / m 3 , and the balance is water. This scheme was tested during the crossing project of the "West-to-East Gas Pipeline" pipeline, and no hole collapse or stuck drill occurred, ensuring smooth drilling.

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PUM

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Abstract

A slurry used for clay layer of horizontal positioned drilling is prepared from alta-mud, soda ash, hydrolytic polyacrylonitrile, lubricant and water. the prepared slurry can prevent drilled hole from collapse and driller from seizing-up in course of horizontally positioned drilling.

Description

Technical field: [0001] The invention relates to a mud used for horizontal directional drilling in the field of geological exploration, and belongs to the mud used for horizontal directional drilling in clay layers. Background technique: [0002] The mud used in the horizontal directional drilling process has the functions of carrying and suspending cuttings, stabilizing the well wall, cooling and flushing the drill bit. At present, the mud used in the horizontal directional drilling process is composed of bentonite and water. The viscosity and shear force of the single-component mud are too high. During the drilling process, when the drill bit passes through the clay, or through loose, When the mud and shale layers are easy to hydrolyze and disperse or make slurry, the drilled cuttings will quickly disperse into fine particles and suspend in the mud. At this time, the density of the mud increases, and the viscosity shear force rises sharply, making the mud more and more Th...

Claims

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Application Information

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Inventor 尹志杰王笑月徐峰耿小光关立志陈守平林春文
Owner 大庆油田建设集团
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