Preparation method of nano calcium carbonate-starch composite for drilling fluid

Abstract

The invention relates to a synthesis method of a nano calcium carbonate-starch composite, belonging to the temporary plugging / shielding technique of reservoir protection. Starch and succinyl oxide react in water phase environment under the catalysis of NaOH, nano calcium carbonate is added 1 to 1.5 hours after the reaction, and glacial acetic acid is used for neutralization. The nano calcium carbonate-starch composite is obtained through purification and vacuum drying. The method provided by the invention has the characteristics of reacting at normal pressure, simple production process, low reaction temperature of between 30 and 50 DEG C, and simpleness and convenience for a purification method due to the use of low-toxicity solvent; and the nano calcium carbonate-starch composite with high purity can be obtained.

Description

Technical field

[0001] The invention designs a drilling fluid treatment agent used in the drilling process of petroleum exploration wells and production wells, and the treatment agent is suitable for shielding temporary plugging technology for protecting reservoirs. technical background

[0002] At present, in the process of oilfield exploration and development, many large oilfields at home and abroad have entered the later stage of development, and some low-grade oil reservoirs have been put into development one after another. The exploration and development of these oil reservoirs are difficult and require high drilling fluids. In the drilling process, drilling fluid is essential. It can carry and suspend the cuttings, stabilize the well wall and balance the formation pressure, cool and lubricate the drill bit and drilling tool, and transmit water power. The performance of the drilling fluid directly affects the quality of the well and the drilling speed. In the process of dr...