Offshore oilfield anti-emulsification workover fluid as well as preparation method and use method thereof
An offshore oil field, anti-emulsification technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as impact, limited processing capacity of surface oil-water separation devices, and affect normal production of offshore platforms, etc., to achieve enhanced flowback performance , Improve production capacity recovery effect, solve the effect of demulsification and dehydration difficulties
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[0032] The present invention also proposes a method for preparing an anti-emulsification workover fluid in an offshore oilfield, which comprises the following steps: 1) water is obtained through pretreatment of production sewage and / or water source well water; the water conforms to the requirements of "Q / HS2042-2014 2) Add the water into the constant temperature stirring tank for heating, so that the temperature of the water is greater than 50 °C; 3) In terms of mass percentage, add 0.5-1.5 % of the drainage aid cleaning agent and 0.1-0.5% of the demulsifier, and stirred evenly to obtain the anti-emulsification workover fluid in the offshore oil field, the total amount of which is 100%.
[0033] The present invention also proposes a method for using the anti-emulsification workover fluid in the offshore oil field to control the temperature of entering the well of the anti-emulsification workover fluid in the offshore oil field to >50°C. By controlling the temperature of the wo...
Embodiment 1
[0062] Add water to the constant temperature stirring tank and heat it to make the water temperature > 50°C; add 1.5% of drainage aid cleaning agent and 0.4% of demulsifier to it, and stir evenly, the total amount is 100%. Wherein, the drainage aid cleaning agent is a mixed aqueous solution comprising sodium dodecylbenzene sulfonate, octadecyl hydroxypropyl sulfobetaine, sodium lignosulfonate and glycerol, wherein the dodecyl The effective content of sodium benzene sulfonate ≥ 15%, the effective content of octadecyl hydroxypropyl sulfobetaine ≥ 15%, the effective content of sodium lignosulfonate ≥ 10%, the effective content of glycerol ≥ 10% . The demulsifier is an aqueous solution of bisphenol A phenolic resin-based polyether, the effective content of which is greater than or equal to 30%.
[0063] The performance evaluation results of the workover fluid of this embodiment are shown in Tables 1 to 4 below.
Embodiment 2
[0065] The same as in Example 1, the proportions of the raw materials are as follows: 1.0% of a cleaning aid for drainage and 0.5% of a demulsifier.
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