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Solid-free recyclable micro-foamed drilling fluid and preparation method thereof

A drilling fluid and solid-free technology, applied in the field of drilling fluid, can solve the problems of complex drilling, oil layer pollution, microbubble temperature resistance, and poor pressure resistance

Active Publication Date: 2014-07-23
北京源碳环境股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the application of micro-foam drilling fluid at home and abroad is to solve the problem of drilling complexity and oil reservoir pollution in low-pressure and leaky areas
The scope of research is only for some specific phenomena, and it does not have a wide range of adaptability. The microbubbles have poor resistance to temperature and pressure, and the selected foaming agent has poor oil resistance, and cannot be adapted to drilling operations in horizontal wells or highly deviated wells.

Method used

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  • Solid-free recyclable micro-foamed drilling fluid and preparation method thereof
  • Solid-free recyclable micro-foamed drilling fluid and preparation method thereof
  • Solid-free recyclable micro-foamed drilling fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A solid phase-free recirculating microfoam drilling fluid, including: adding 1 gram of NaOH per liter of clear water, 5 grams of xanthan gum XC, 3 grams of polyanionic cellulose PAC, 20 grams of modified starch, and 1 gram of foaming agent BZ - MBS-1, 6 grams of foam stabilizer BZ-MBSF-1, 60 grams of lubricant.

[0019] Wherein, what the modified starch adopts is sodium carboxymethyl starch, and the foaming agent BZ-MBS-1 is sodium lauryl sulfate and sodium dodecyl benzsulfonate with a mass ratio of 6.5:3:0.5. A mixture with sodium tripolyphosphate; the foam stabilizer is a mixture of silicone resin polyether emulsion and lauryl alcohol with a mass ratio of 7:3. The solid-free recyclable microfoam drilling fluid has oil resistance. After the drilling operation, the defoamer BZ-MBDF can be used to defoam, and the density will return to the base fluid density, which can be recycled. The defoamer BZ-MBDF is Dimethicone oil with a viscosity of 300-500mpa.s.

Embodiment 2

[0021] A solid phase-free recirculating microfoam drilling fluid, including: 2 grams of NaOH per liter of clear water, 3 grams of xanthan gum XC, 5 grams of polyanionic cellulose PAC, 10 grams of modified starch, and 6 grams of foaming agent BZ - MBS-1, 1 g of foam stabilizer BZ-MBSF-1, 80 g of lubricant.

[0022] Wherein, what the modified starch adopts is sodium carboxymethyl starch, and the foaming agent BZ-MBS-1 is sodium lauryl sulfate and sodium dodecyl benzsulfonate with a mass ratio of 6.5:3:0.5. A mixture with sodium tripolyphosphate; the foam stabilizer is a mixture of silicone resin polyether emulsion and lauryl alcohol with a mass ratio of 7:3. The solid-free recyclable microfoam drilling fluid has oil resistance. After the drilling operation, the defoamer BZ-MBDF can be used to defoam, and the density will return to the base fluid density, which can be recycled. The defoamer BZ-MBDF is Dimethicone oil with a viscosity of 300-500mpa.s.

Embodiment 3

[0024] A kind of solid phase-free recirculating microfoam drilling fluid, including: adding 1.5 grams of NaOH per liter of clear water, 4 grams of xanthan gum XC, 4 grams of polyanionic cellulose PAC, 15 grams of modified starch, and 2 grams of foaming agent BZ - MBS-1, 5 grams of foam stabilizer BZ-MBSF-1, 70 grams of lubricant.

[0025] Wherein, what the modified starch adopts is sodium carboxymethyl starch, and the foaming agent BZ-MBS-1 is sodium lauryl sulfate and sodium dodecyl benzsulfonate with a mass ratio of 6.5:3:0.5. A mixture with sodium tripolyphosphate; the foam stabilizer is a mixture of silicone resin polyether emulsion and lauryl alcohol with a mass ratio of 7:3. The solid-free recyclable microfoam drilling fluid has oil resistance. After the drilling operation, the defoamer BZ-MBDF can be used to defoam, and the density will return to the base fluid density, which can be recycled. The defoamer BZ-MBDF is Dimethicone oil with a viscosity of 300-500mpa.s.

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Abstract

The invention discloses a solid-free recyclable micro-foamed drilling fluid which is prepared from the following raw materials, added in per liter clear water, by weight: 1-2g of NaOH, 3-5g of xanthan gum XC, 3-5g of polyanionic cellulose PAC, 10-20g of modified starch, 1-6g of foaming agent BZ-MBS-1, 1-6g of foam stabilizer BZ-MBSF-1, and 60-80g of lubricant. The drilling fluid is low in density, good in shielding effect, obvious for leakage prevention effect of a low-pressure and easily-leaked layer, simple to prepare, adjustable in density, applicable to low-pressure, easily-leaked and multi-pressure system stratums, the foaming agent has excellent oil resistance, and after the drilling operation is finished, the defoaming can be conducted, and the density can be restored to the density of a base fluid.

Description

technical field [0001] The invention relates to a drilling fluid, in particular to a solid-phase-free circulating microbubble drilling fluid and a preparation method thereof. Background technique [0002] Lost circulation is a phenomenon in which a large amount of drilling fluid leaks into the formation when the formation pressure is lower than the fluid column pressure. Lost circulation will cause downhole accidents or complex situations, resulting in prolonged construction time, increased operating costs, and even the scrapping of oil and gas wells, resulting in serious waste of resources and huge economic losses. Not only that, because a large amount of drilling fluid enters the oil and gas layers, the oil and gas production capacity of the reservoir is reduced, and more manpower and material resources must be invested to increase production and recovery, which affects the economic benefits of the oil field. Therefore, in order to improve the economic benefits of oilfiel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/12
CPCC09K8/12C09K2208/34
Inventor 李中锋
Owner 北京源碳环境股份有限公司
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