Rheological stabilizer for synthetic base drilling fluid and preparation method thereof
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A drilling fluid and stabilizer technology, which is applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of easy leakage of lost circulation, difficult control of lost circulation and pressure, and large difference in ECD value, and achieves good compatibility. Effect
Active Publication Date: 2013-10-16
CHINA NAT OFFSHORE OIL CORP +1
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Synthetic-based drilling fluid has become a common drilling fluid system for offshore oil and gas drilling because of its high rate of penetration and good wall stability. However, the viscosity and shear force of this drilling fluid are significantly affected by temperature, so lost circulation is prone to occur. , especially when the drilling fluid is left standing for a long time
[0003] In summary, it is necessary to provide a rheological stabilizer for synthetic-based drilling fluids, so that the dynamic shear force of the synthetic-based drilling fluid system will not be affected by temperature changes, so as to solve the problem of rheological problems caused by conventional synthetic-based drilling fluids during deepwater drilling. The large difference between low temperature and high temperature causes technical problems such as high ECD value, lost circulation and pressure control
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[0028] Add 80 grams of methacrylic acid, 50 grams of N-dodecylacrylamide, 50 grams of styrene and 80 grams of toluene into the laboratory autoclave, protect it with nitrogen, start stirring and raise the temperature to 60 ° C, add 3.2 grams of azo Diisobutyronitrile, react at this temperature for 2 hours, then raise the temperature to 110°C, continue to react for 3 hours, vacuumize, remove the solvent under negative pressure of -0.06MPa, cool to 40°C and discharge to obtain the rheological stabilizer.
[0030] Add 50 grams of maleic acid, 30 grams of N-octadecyl acrylamide, 50 grams of styrene and 60 grams of toluene into the laboratory autoclave, protect it with nitrogen, start stirring and heat up to 60 ° C, add 2.6 grams of Benzoyl peroxide reacted at this temperature for 2 hours, then raised the temperature to 110°C, continued to react for 4 hours, vacuumed, removed the solvent under negative pressure of -0.06MPa, cooled to 40°C and discharged to obtain the rheological stabilizer.
[0032] Add 60 grams of acrylic acid, 50 grams of N-dodecyl acrylamide, 80 grams of styrene and 100 grams of xylene into a laboratory autoclave, protect with nitrogen, start stirring and heat up to 60 ° C, add 4.0 g of azobis Isobutyronitrile, react at this temperature for 2 hours, then raise the temperature to 130°C, continue to react for 3 hours, vacuumize, remove the solvent under negative pressure of -0.07MPa, cool to 40°C and discharge to obtain the rheological stabilizer.
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Abstract
The invention discloses a rheological stabilizer for a synthetic base drilling fluid and a preparation method thereof. The method comprises the following steps: in the inert atmosphere, an allyl monomer is subject to copolymerization to obtain the rheological stabilizer under the condition that both an organic solvent and an initiator exist; the allyl monomer is at least one of the unsaturated fatty acid with carboxyl, long carbon chain acrylamide and phenethylene compound. The rheological stabilizer is suitable for preparing a deepwater synthetic base drilling fluid; after the stabilizer is added, the shearing force of a drilling fluid system is less influenced by temperature change. The rheological stabilizer can solve the problems of high ECD (Equivalent Circulating Density) value, circulation loss, difficulty in pressure control and the like, which are caused by great difference between the rheology behaviors of the conventional synthetic base drilling fluid under low-temperature and high-temperature conditions, so as to better adapt to deepwater drilling requirements. The rheological stabilizer provided by the invention has excellent compatibility with other additive for drilling fluids.
Description
technical field [0001] The invention relates to a rheological stabilizer for synthetic base drilling fluid and a preparation method thereof. Background technique [0002] The temperature changes significantly during deepwater drilling, and the rheology of the drilling fluid is greatly affected by the temperature, especially the viscosity under dynamic shear force and low shear rate is difficult to control, resulting in lost circulation and high equivalent circulating density (ECD). A series of problems such as difficult pressure control are becoming the challenges faced by deepwater drilling. Synthetic-based drilling fluid has become a common drilling fluid system for offshore oil and gas drilling because of its high rate of penetration and good wall stability. However, the viscosity and shear force of this drilling fluid are significantly affected by temperature, so lost circulation is prone to occur. , especially when the drilling fluid is left standing for a long time. ...
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