Low temperature early-strength coagulant agent

Abstract

This invention is related to that in the process of sea oil field exploration and drilling, we often adopt concentrated drilling and well fixing model. But in the operation of surface concentrated fixing, because there are too many wells, and the space between the wells is small, the surface tube is shallow to the field and the temperature is low in the winter, so it is bad for the surface fixing of well at a large scale and with close space between the wells. Adopting the high-early accelerant of this invention can shorten the densification time of cement paste under low temperature to freeze the cement in the low temperature quickly, and meet the demand of large scale of production and close drilling and the surface fixing of low temperature, shallow layer and filtering conditions.

Description

technical field [0001] The invention relates to a low-temperature early-strength coagulation accelerator composition; the low-temperature early-strength coagulation accelerator composition can shorten the thickening time of cement slurry under low-temperature conditions, and promote the rapid solidification of cement slurry under low-temperature conditions; the low-temperature early-strength coagulation accelerator composition The coagulant composition is used in offshore oil drilling, especially suitable for concentrated offshore oil drilling under low temperature conditions. The low-temperature early-strength coagulant shortens the thickening time of cement slurry and promotes rapid solidification of cement slurry under low temperature conditions . Background technique [0002] In the process of offshore oilfield development and drilling operations, centralized drilling and cementing operation modes are usually adopted. However, in concentrated surface cementing construct...

AI Technical Summary

Problems solved by technology

However, in concentrated surface cementing construction, due to the large number of boreholes, small borehole spacing, shallow casing penetration into the surface layer, and low operating temperature in winter, it is extremely unfavorable for large batches, dense well spacing, low temperature, shallow layers, and easy leakage. subsurface cementing

[0003] It is known common practice to add CaCl to a single well 2 , to improve the early strength of cement slurry, but it cannot meet the requirement of extremely short cement slurry thickening time under the condition of dense well spacing; also, if the added CaCl 2 If the amount is too large, its performance will often be reversed, which will bring unpredictable risks to cementing

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