Oil-well cement temperature-sensitive slow-release coagulation accelerator

Abstract

The invention discloses an oil-well cement temperature-sensitive slow-release coagulation accelerator. The oil-well cement temperature-sensitive slow-release coagulation accelerator is prepared by employing an oil phase separation microcapsule technology. The method comprises the following steps: adding 3-5 weight parts of stearic acid and 100-125 weight parts of an organic solvent in a triangular flask, fully stirring the materials, heating water-bath at the temperature of 70-80 DEG C until stearic acid is fully dissolved, then adding 1-3 weight part of polyethylene glycol 4000 and 1-2 weight parts of a coagulating material, stopping stirring after 1-3 min, performing ultrasonic vibrating for 10-20 min, uniformly dispersing polyethylene glycol 4000 and the coagulating material in a solution, re-stirring the materials, and gradually cooling the material to the temperature of lower than 35 DEG C, filtering the material, and performing normal temperature drying on the material for 24 h to obtain the product. The oil-well cement temperature-sensitive slow-release coagulation accelerator has stable performance in a cement mortar, can be slowly released after reaching a preset temperature spot, has good slow releasing effect, the coagulation accelerator can obviously shorten the curing time of deep well and extradeep well after release, effectively solve the super-retarding problem of the deep well and the extradeep well, the preparation method is simple, the raw materials are common, the cost is low, the accelerator is easily popularized, and has wide market prospect.

Description

technical field [0001] The invention belongs to the field of well cementing cement slurry in exploration and development of oil and gas fields, and in particular relates to a novel temperature-sensitive slow-release coagulant. Background technique [0002] With the development of oilfield exploration and development in the direction of deep wells, ultra-deep wells and complex wells, the temperature and pressure at the bottom of the well continue to rise, resulting in a long one-time upward sealing section and a large temperature difference between the top and bottom of the sealing section. Special requirements for well cement slurry to prevent rapid thickening and condensation of cement slurry during pumping in deep well and ultra-deep well cementing operations to ensure safe and smooth construction. It is necessary to add a large amount of retarder to the cement slurry to improve high temperature The thickening performance and rheological properties of cement slurry under h...

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Problems solved by technology

[0004] At present, although the temperature resistance and temperature sensitivity (adaptability to a wide temperature range) of the retarder have been significantly improved, and the problem of safe pumping of one-time cementing in the long sealing section has been solved, it still cannot solve the problem of deep well , The cement slurry at the top of the long sealing section of the ultra-deep well is super retarded, the waiting time is too long, and the construction period is increased

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