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Deepwater drilling liquid

A deepwater drilling and drilling fluid technology, applied in the field of deepwater drilling fluids, can solve the problem that the drilling fluid is not suitable for the drilling construction of deep oceans

Inactive Publication Date: 2012-12-05
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to solve the problem that the existing drilling fluid is not suitable for offshore deep well drilling construction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Deepwater drilling fluid includes the following components in mass percentage:

[0027] Bentonite, 8%;

[0028] Vinyl monomer polymer for drilling fluid, 0.05%;

[0029] Viscosity reducer and fluid loss reducer for drilling fluid, 1%;

[0030] Carboxymethyl sulfonated phenolic resin for drilling fluid, 6%;

[0031] Sodium chloride NaCl, 5%;

[0032] Ethylene glycol, 50%;

[0033] The rest is freshwater or seawater.

[0034] After the above components are mixed, stir at a high speed under normal temperature and pressure for 40 minutes.

Embodiment 2

[0036] Deepwater drilling fluid includes the following components in mass percentage:

[0037] Potassium polyacrylate, 3%;

[0038] Viscosity reducer and fluid loss reducer for drilling fluid, 6%;

[0039] Carboxymethyl sulfonated phenolic resin for drilling fluid, 1%;

[0040] Sodium chloride NaCl, 10%;

[0041] Ethylene glycol, 5%;

[0042] The rest is freshwater or seawater.

[0043] After the above components are mixed, stir at a high speed under normal temperature and pressure for 40 minutes.

Embodiment 3

[0045] Deepwater drilling fluid includes the following components in mass percentage:

[0046] Bentonite, 6%;

[0047] Potassium polyacrylate, 0.5%;

[0048] Viscosity reducer and fluid loss reducer for drilling fluid, 2%;

[0049] Carboxymethyl sulfonated phenolic resin for drilling fluid, 5%;

[0050] Sodium chloride NaCl, 10%;

[0051] Ethylene glycol, 30%;

[0052] The rest is freshwater or seawater.

[0053] After the above components are mixed, stir at a high speed under normal temperature and pressure for 40 minutes.

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PUM

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Abstract

The invention relates to drilling liquid, in particular to deepwater drilling liquid which comprises the following components, by mass percent: 0-8% of bentonite, 0.05-5% of well wall stabilizing agent, 1-6% of visbreaking fluid loss control agent used for the drilling liquid, 1-6% of carboxymethyl sulfonated phenol formaldehyde resin used for the drilling liquid, 5% of sodium chloride NaCl to saturated sodium chloride NaCl, 5-50% of glycol and the balance of fresh water or seawater. The invention provides a formula of the drilling liquid suitable for (marine) deepwater drilling and solves the problems of poor rheological property of the drilling liquid in a deepwater drilling process, easy formation of a natural gas hydrate and the like. The formula can be suitable for deepwater drillingin the water depth within 3000m and at the temperature of 0-150 DEG C, and the long-term stability can reach 7 days.

Description

technical field [0001] The invention relates to a drilling fluid, in particular to a deep water drilling fluid. Background technique [0002] Compared with onshore drilling or shallow water drilling, there are big differences in offshore deepwater drilling construction, such as low temperature at the bottom of deep water, high pressure, under-compacted formation, multiple casing layers, and large riser diameter. Correspondingly, the construction Many technical difficulties and challenges have been brought to the drilling fluid. [0003] Deepwater drilling fluid must have the following characteristics: 1. Good rheology at low temperature. As the water depth increases, the seawater temperature becomes lower and lower. The temperature at 3,000 meters deep is only 3-4°C, and in some areas it is even around 0°C. The drop in temperature will bring many problems to drilling and oil production operations. Under low temperature conditions, the rheology of the drilling fluid will ch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/14C09K8/24C09K8/22
Inventor 徐加放邱正松黄维安江琳于连香
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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