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A deep-water drilling and drilling fluid technology, applied in the field of deep-water drilling fluid, can solve the problem that the drilling fluid is not suitable for offshore deep well drilling construction, etc.
Inactive Publication Date: 2010-05-12
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology
[0005] The technical problem to be solved by the present invention is to solve the problem t
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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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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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