Weak-gel synthetic drilling fluid and preparation method thereof
A technology for synthesizing base and drilling fluid, applied in the field of drilling fluid, can solve the problems of low shear rate, low viscosity, difficulty in tripping, and poor ability to carry drill cuttings, etc., and achieves the effects of good thixotropy and high drilling speed.
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[0035] Drilling fluid preparation
[0036] The organic soil used in the examples is PF-MOGEL, provided by COSL; the main emulsifier is PF-MOEMUL-P, provided by COSL; the auxiliary emulsifier PF-MOCOAT, provided by COSL; the wetting agent is PF-MOWET, Provided by COSL; fluid loss reducer is PF-MOHFL, provided by COSL.
Example Embodiment
[0037] Example 1
[0038] a. Formula:
[0039] Gas to oil: 70 parts;
[0040] 30% calcium chloride aqueous solution: 30 parts; and
[0041] Based on the total volume parts of gas-to-oil and calcium chloride aqueous solution (100 parts), each component is the following mass-volume ratio:
[0042] PF-MOGEL: 2.5%;
[0043] PF-MOEMUL-P: 1.0%;
[0044] PF-MOCOAT: 1.5%;
[0045] Calcium oxide: 2.5%;
[0046] PF-MOWET: 0.8%;
[0047] PF-MOHFL: 2.5%;
[0048] Weighting agent: 32.5% barite.
[0049] b. Preparation process: Add the PF-MOGEL of the mass-volume ratio to the gas-to-liquid of the volume and stir at medium speed for 8 min, and add the PF-MOEMUL-P and PF-MOCOAT of the mass-volume ratio and stir at high speed for 2 min. Under the condition of high-speed stirring, add the 30% by volume calcium chloride aqueous solution and stir at high speed for 20 minutes; add the calcium oxide with the mass-to-volume ratio and stir at high speed for 5 minutes; add the mass-to-volume ratio of PF -MOWET high...
Example Embodiment
[0050] Example 2
[0051] a. Formula:
[0052] Gas to oil: 70 parts;
[0053] 30% calcium chloride aqueous solution: 30 parts; and
[0054] Based on the total volume parts of gas-to-oil and calcium chloride aqueous solution (100 parts), each component is the following mass-volume ratio:
[0055] PF-MOGEL: 2.5%;
[0056] PF-MOEMUL-P: 1.0%;
[0057] PF-MOCOAT: 1.5%;
[0058] Calcium oxide: 2.5%;
[0059] PF-MOWET: 0.8%;
[0060] PF-MOHFL: 2.5%;
[0061] PF-MOVIS: 0.3% (a high molecular polymer with a non-linear network structure formed by adipic acid and triethylenetetramine under the protection of nitrogen through polycondensation reaction, with a molecular weight of 87,000, provided by Guangdong Kaiping United Technology Chemical Co., Ltd. );
[0062] Weighting agent: 32.5% barite.
[0063] b. Preparation process: Add the PF-MOGEL of the mass-volume ratio to the gas-to-liquid of the volume and stir at medium speed for 8 min, and add the PF-MOEMUL-P and PF-MOCOAT of the mass-volume ratio and s...
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