An anti collapse sealing agent for drilling fluid its preparation method application

The invention provides an anti sloughing plugging agent for drilling fluid its preparation method application. The preparation method of the plugging agent includes the following steps: a, adding Sulfite / hydrogen Sulfurous acid into water to completely dissolve to obtain solution A, then adding Dimethylamine aldehydes into solution A, heating to make it react to obtain the addition product; b. Mix phenolic substances aldehydes, heat them to react, obtain solution B. Drilling mud additives

c. Add an alkaline catalyst to solution B to obtain solution C; d. The addition product described in step a is added to solution C obtained in step c for reaction. After the reaction is completed, the anti collapse sealing agent is obtained after drying. The anti collapse sealing agent of the present invention is a new type of anti collapse sealing agent, which has the advantages of low fluorescence intensity, good sealing performance at high temperatures, no viscosity increase thickening, good compatibility with drilling fluid, good reservoir protection effect.

In view of the shortcoming that the softening point of existing plugging materials is lower than the temperature of deep target formation lose the plugging effect, a new plugging agent NAZ-1 was synthesized by using polypropylene glycol, Isophorone diisocyanate, dimethylol propionic acid surface modified nano-SiO2; The softening point sealing properties of NAZ-1 were studied using a softening point tester a high-temperature high-pressure sealing instrument, the rheological properties of NZA-1 drilling fluid were evaluated.

The results show that the softening point of NZA-1 is as high as 155 ℃, under the condition of 3.5MPa, NAZ-1 can quickly seal the microcracks, forming a sealing layer with good sealing performance; Adding 4% NAZ-1 to the drilling fluid does increase viscosity thickening, has little effect on the rheological properties of the drilling fluid system.

Hebei Huayun Hongye Chemical Co., Ltd. is a joint venture established with Hong Kong Diyun Investment Co., Ltd. The company mainly produces sells oilfield chemical products resin products. We also undertake on-site technical services for mud, are a technology-oriented enterprise that integrates technology development, production sales, technical services, with high-tech products as its orientation.