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Slurry in use for directional drilling into drifting sand layer in horizontal

A horizontal orientation and quicksand technology, applied in the direction of drilling equipment, etc., can solve problems such as poor suspension capacity, sandy quicksand, high water content, thick mud cake, etc.

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. During the drilling process, the quicksand layer will be encountered. The quicksand contains sand and water content, and the porosity is extremely poor. It is easy to collapse, It is easy to leak. When the drill bit passes through the quicksand layer, and when it is back expanded and dragged back, it is required that the mud has a strong ability to carry cuttings and a good wall protection performance. The fine sand in the mud should be removed in time to prevent leakage and collapse. If the viscosity and shear force are too high, a large amount of cuttings and sand will remain in the mud due to the poor suspending ability of the mud, and the sedimentation and removal of cuttings are difficult. The viscosity and shear force increase, and the formed mud cake is thick and loose, which is easy hole leakage, landslide phenomenon

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1, each component and the content of the mud of this horizontal directional drilling into quicksand layer are as follows: bentonite 85Kg / m 3 , Potassium humate 2.4Kg / m3 , polyacrylamide 2.1Kg / m 3 , Hydrolyzed polyacrylonitrile 2.7Kg / m 3 , Sulfonated phenolic resin 3.2Kg / m 3 , white oil lubricant 2.8Kg / m 3 , and the balance is water. The mud prepared by this scheme was tested during the crossing project of the "West-to-East Gas Pipeline" pipeline, and there were no hole collapses and drill sticking phenomena, ensuring smooth drilling.

Embodiment 2

[0022] Embodiment 2, each component and the content of the mud of this horizontal directional drilling into quicksand layer are as follows: bentonite 80Kg / m 3 , Potassium humate 2.5Kg / m 3 , polyacrylamide 1.8Kg / m 3 , Hydrolyzed polyacrylonitrile 2.81Kg / m 3 , Sulfonated phenolic resin 3.0Kg / m 3 , white oil lubricant 3.0Kg / m 3 , and the balance is water. The mud prepared by this scheme was tested during the crossing project of the "West-to-East Gas Pipeline" pipeline, and there were no hole collapses and drill sticking phenomena, ensuring smooth drilling.

Embodiment 3

[0023] Embodiment 3, each component and the content of the mud of this horizontal directional drilling into quicksand layer are as follows: bentonite 90Kg / m 3 , Potassium humate 3.0Kg / m 3 , polyacrylamide 2.0Kg / m 3 , Hydrolyzed polyacrylonitrile 3.1Kg / m 3 , Sulfonated phenolic resin 2.7Kg / m 3 , white oil lubricant 3.2Kg / m 3 , and the balance is water. The mud prepared by this scheme was tested during the crossing project of the "West-to-East Gas Pipeline" pipeline, and there were no hole collapses and drill sticking phenomena, ensuring smooth drilling.

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Abstract

A slurry used for running sand layer of horizontal positioned drilling is prepared from alta-mud, collapse-proof agent, polyacrylamide, dehydration reducing agnet, sulphonating Arcolite, lubricant and water. The prepared slurry can prevent drilled hole from collapse and driller from seizing-up in course of horizontal 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 into quicksand 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. During the drilling process, the quicksand layer will be encountered. The quicksand contains sand and water content, and the porosity is extremely poor. It is easy to collapse, It is easy to leak. When the drill bit passes through the quicksand layer, and when it is back expanded and dragged back, it is required that the mud has a strong ability to carry cuttings and a good wall protection performance. The fine sand in the mud should be removed ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
Inventor 尹志杰王笑月徐峰耿小光王尧林春文李绪金
Owner 大庆油田建设集团
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