Dispersed solid fluid loss reducer for seawater cement slurry and preparation method thereof

Abstract

The invention discloses a dispersive solid fluid loss agent for seawater cement slurry and a preparation method of the dispersive solid fluid loss agent. The preparation method comprises the following steps: (1) dissolving allyl polyethylene glycol and carboxylic acid monomers into water; (2) adding 2-acrylamido-2-methylpropanesulfonic acid and acrylamide monomers, uniformly stirring, heating, and adjusting the pH value, so as to obtained a mixed solution; and (3) adding an initiating agent into the mixed solution to react to generate faint yellow viscous liquid, and carrying out freeze drying, grinding or crushing. The dispersive solid fluid loss agent disclosed by the invention is capable of blocking pores of cement without thickening a cement slurry system and is suitable for being used as an oil-well cement fluid loss agent. The dispersive solid fluid loss agent has relatively strong dispersive capacity and hydrability to cement slurry, so that the fluid loss control effect and salt tolerance of the fluid loss agent are improved, and the fluid loss control capacity of nonionic group acylamino enhanced cement slurry is improved. The dispersive solid fluid loss agent is easy to store and convenient to transport, and the slurry is easily stirred. The sedimentary stability of a slurry body is good, thixotropy does not easily occur, and the delayed coagulation side effect is avoided.

Description

technical field [0001] The invention relates to an oil well cement fluid loss reducer and a preparation method thereof, in particular to a dispersed solid fluid loss reducer for seawater cement slurry and a preparation method thereof. Background technique [0002] Under the circumstance that recoverable and easily recoverable oil is gradually decreasing, the exploration and development of oilfields has developed into the ocean and deep wells. Because some metal cations in seawater will reduce the fluidity of cement slurry, it will greatly affect the rheology, fluid loss control ability and compressive performance of cement slurry. Marine cementing requires fluid loss reducer to have good fluid loss control effect and dispersibility. In order to ensure sufficient hydrodynamic bottom pressure, the cementing of deep wells and long sealing sections requires low cement slurry density, which also requires good dispersion performance of the fluid loss reducer. However, the conven...

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Problems solved by technology

J.Plank et al. used AHPS, AMPS and other monomers to synthesize the fluid loss reducer in the freshwater cement slurry at 200°C with low API value, small rheological value and good dispersibility, but there is no research on the fluid loss reducer. The ability to resist salt is investigated, and the operation process is more complicated

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