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Preparation method of saline-alkali-resistant composite plugging agent

A technology of water blocking agent and salt and alkali resistance, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of poor water blocking effect, poor temperature resistance and salt and alkali resistance, and achieve strong acid and alkali resistance Excellent heat resistance, acid and alkali resistance, and enhanced water blocking effect

Inactive Publication Date: 2019-07-19
深圳地球村环保产业有限公司
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Problems solved by technology

[0009] The main technical problem to be solved by the present invention is to provide a saline-alkali-resistant composite water blocking agent for the current common polyacrylamide gel system water blocking agent, which has poor temperature resistance and salt and alkali resistance, resulting in poor water blocking effect. preparation method

Method used

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  • Preparation method of saline-alkali-resistant composite plugging agent

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preparation example Construction

[0028] Preparation of spray-dried powder: according to CaO / SiO 2 The molar ratio is 2:1, weigh an appropriate amount of calcium nitrate tetrahydrate and silica sol, dissolve calcium nitrate tetrahydrate into a 1mol / L calcium nitrate solution with deionized water, and mix and stir the calcium nitrate solution and silica sol for 1 hour to obtain a mixed liquid, and then the mixed solution is spray-dried at a spray-drying rate of 1000mL / h to obtain a spray-dried powder;

[0029] Preparation of ball mill powder:

[0030]Put the spray-dried powder obtained above into a sintering furnace, pre-sinter at 700°C for 10 minutes, mix the pre-sintered product with methyl cellulose and calcium phosphate in a mass ratio of 100:3:2, and then ball mill for 2 hours to obtain ball mill powder;

[0031] Preparation of porous dicalcium silicate powder:

[0032] Mix the ball mill powder and deionized water at a mass ratio of 10:1, stir and mix for 10 minutes, put it into a microwave sintering fu...

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Abstract

The invention belongs to the technical field of oil reservoir development, and particularly relates to a preparation method of a salt-alkali-resistant composite plugging agent. The preparation methodof the plugging agent comprises the following steps: firstly, preparing porous dicalcium silicate through spray drying and microwave sintering; then compounding xanthan gum and 2-acrylamide-2-methylpropanesulfonic acid serving as raw materials with the porous dicalcium silicate to prepare water-absorbent resin; and finally preparing the saline-alkali-resistant composite water plugging agent. Xanthan gum is relatively high in thermal stability and has extremely high acid and alkali resistance, thus the prepared water plugging agent is good in heat resistance and acid and alkali resistance. Xanthan gum, 2-acrylamide-2-methylpropanesulfonic acid and porous dicalcium silicate are compounded, the resin material prepared by compounding retains glucuronic acid and pyruvic acid groups on a side chain of the xanthan gum, amide and sulfonic acid groups are added, so that the water absorption capability of the product is greatly enhanced, the water plugging effect is enhanced, and the water plugging agent has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of oil reservoir development, and in particular relates to a preparation method of a saline-alkali-resistant composite water shutoff agent. Background technique [0002] In the process of oilfield exploitation, due to channeling of water layer, coning of bottom water or intrusion of water injection and edge water, some oil wells will see water prematurely or be flooded. In order to remove or reduce water flooding, control the flow of water in the water-producing layer and change the flow direction of water in water-flooding oil, and improve the recovery rate of water-flooding oil, the chemistry used to seal the water-producing layer on the production well or injection well The treatment agent is called water blocking agent. [0003] The extensive use of oilfield chemicals was after the 1930s. The most widely used and most significant abroad is the gel-type water plugging and profile control agent formed by...

Claims

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Application Information

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IPC IPC(8): C09K8/514
CPCC09K8/514
Inventor 王志慧
Owner 深圳地球村环保产业有限公司
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