60results about How to "Good fluid loss control" patented technology

The invention relates to the field of petroleum exploitation, and discloses a carboxyl-modified graphene graft polymer as well as a preparation method and application thereof. The method comprises: (1) dissolving acrylamide, benzenesulfonic acid, and N-vinylpyrrolidone in water, adding carboxyl-modified graphene, and adding a first emulsifier to obtain an aqueous phase system; adding the second emulsifier Dissolve in the oil phase to obtain an oil phase system; (2) prepare an inverse emulsion system by combining the water phase system with the oil phase system; (3) perform the first polymerization reaction on the inverse emulsion system , to obtain an intermediate product system; the intermediate product system is carried out to a second polymerization reaction to obtain a pre-product; (4) the pre-product is purified, dried and pulverized to obtain a carboxyl-modified graphene graft polymer; wherein , the oxygen element content in the XPS test result of the carboxyl-modified graphene is not less than 26wt%. The polymer provided by the invention is used as a fluid loss reducer for drilling fluid and has excellent temperature and salt resistance.

A high-softening point emulsified asphalt water-based drilling fluid additive and a preparation method thereof. The drilling fluid additive comprises 40-70 wt% of asphalt with a softening point of 150 DEG C-240 DEG C, 35-50 wt% of water, 0.02-2 wt% of an auxiliary agent, 0.05-5 wt% of an emulsifier, and 0.01-1 wt% of a stabilizer; the charge of the additive is anion; the storage stability for 1 day is not more than 1%; the storage stability for 5 day is not more than 5%; the high-temperature high-pressure filter loss at 220 DEG C and at 3.45 MPa is not more than 25 ml. The preparation method of the additive comprises the following steps: mixing water, the anion emulsifier, the stabilizer, and the auxiliary agent, then adding the asphalt fine powder with a softening point of 150 DEG C-240 DEG C into the above solution, and stirring. The drilling fluid additive provided by the invention has good high-temperature high-pressure filter loss effect, and is suitable for drilling of high-temperature high-pressure deep wells and extradeep wells.