Dispersant for ultra-high-density drilling fluid, preparation method and application thereof
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An ultra-high density and drilling fluid technology, applied in the field of oil drilling, can solve the problems of poor effect and ineffectiveness, and achieve strong salt pollution resistance and good dispersion effect
Active Publication Date: 2013-04-03
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
However, in high-density drilling fluids, especially ultra-high-density drilling fluids, the effect of adding these treatment agents to drilling fluids to reduce viscous shear is not good, or even ineffective
Method used
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Embodiment 1
[0056] The dispersant for ultra-high-density drilling fluid is prepared from the following raw materials: 20 parts of herbal lignin, 10 parts of phenol, 8 parts of sodium sulfite, 2 parts of formaldehyde, 1.2 parts of p-toluenesulfonic acid, and 100 parts of water. React at 160-170°C for 8 hours, and dry to obtain dispersant SMS-19A.
[0057] Preparation of saline-weighted base slurry: add 12g sodium chloride and 1.2g anhydrous sodium carbonate to 300mL distilled water, stir at high speed for 5 minutes, add 24g experimental sodium bentonite, stir at high speed for 20 minutes, maintain in a grinding bottle for 24 hours, and stir at high speed Add 980g of barite, stir at high speed for 10 minutes, use it as a base slurry for brine, and measure its Φ 1000 Readings, density and fluid loss, the density of the brine weighted slurry should be 2.40±0.05g / cm 3 within the range, Φ 100 The value should be within the range of 145±10, and the fluid loss at room temperature and 120°C roll...
Embodiment 2
[0063] The dispersant for ultra-high density drilling fluid is prepared from the raw materials of the following components: 18 parts of woody lignin, 10 parts of p-cresol, 8 parts of sodium sulfite, 3 parts of formaldehyde, 1 part of p-toluenesulfonic acid, 100 parts of water, After mixing evenly, react at 160-170°C for 8 hours, and make dispersant SMS-19B after drying.
[0064] The results obtained by the test method in Example 1 are shown in Table 1.
Embodiment 3
[0066] The dispersant for ultra-high-density drilling fluid is prepared from the raw materials of the following components: 20 parts of woody lignin, 10 parts of phenol, 10 parts of sodium bisulfite, 4 parts of formaldehyde, 1.5 parts of p-toluenesulfonic acid, and 100 parts of water , After mixing evenly, react at 170-180°C for 6 hours, and dry to obtain dispersant SMS-19C.
[0067] The results obtained by the test method in Example 1 are shown in Table 1.
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Abstract
The invention discloses a dispersant for ultra-high-density drilling fluid, a preparation method and application thereof. The dispersant is prepared through the reaction of raw materials containing the following components in parts by weight: 10-40 parts of lignin, 1.5-20 parts of phenols, 2.5-15 parts of sulfonating agent, 0.5-5 parts of telomerization agent, 0.5-4 parts of catalyst and 100 parts of water. The method comprises the steps of mixing the components uniformly, carrying out reaction for 6-10 hours at the temperature of 160-180 DEG C, and then obtaining the dispersant for the ultra-high-density drilling fluid. The dispersant disclosed by the invention is applied to the ultra-high-density drilling fluid, and the surface properties of solid-phase weighting agents, such as barite and the like, can be remarkably improved; the hydration film formation for the surfaces of weighting agent particles is prompted, and the agglomeration role and frictional resistance among the weighting agent particles are reduced, so that the viscosity and shearing force of the prepared high-density drilling fluid are reduced, and the fluidity of the high-density drilling fluid is improved; and the dispersant is non-toxic and efficient, and the preparation method is simple and easy in operation.
Description
technical field [0001] The invention relates to the field of petroleum drilling, and more particularly relates to a dispersant for ultra-high density drilling fluid, a preparation method and application. Background technique [0002] With the continuous deepening of oil and gas exploration and development at home and abroad, the formations encountered are becoming more and more complex, and the number of deep and ultra-deep wells drilled is increasing. The application of ultra-high-density drilling fluids has attracted more and more attention. A large number of weighting materials added to increase the density of the drilling fluid will seriously affect the performance of the drilling fluid. With a density of 4.2g / cm 3 The prepared barite density is 2.4g / cm 3 For the above drilling fluid, the weighted material volume fraction accounts for about 50% of the total volume of the drilling fluid, and the high solid phase content increases the internal friction of the drilling fl...
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