Preparation method of salicornia herbacea saline-alkaline-tolerant filtrate reducer

Abstract

The invention discloses a preparation method of a salicornia herbacea saline-alkaline-tolerant filtrate reducer and belongs to the technical field of oil field additive preparation. Firstly, salicornia herbacea stems are dry-cooled and dry-grinded and then are mixed and fixed with glutaraldehyde, then a filter cake is filtered and collected, n-butyl alcohol oscillation and extraction are performed, extraction filtrate is collected, rotary evaporation is performed to obtain a concentrated extraction solution, then the extraction filter cake is mixed and heated with deionized water and cellulase, then the filtrate is collected, rotary evaporation is performed to obtain a salicornia herbacea fiber hydrolysis concentrated solution, then the concentrated solution is mixed and oscillated with the concentrated extraction solution, a mixed dispersion solution is collected and is mixed and heated with absolute ethyl alcohol, and finally the obtained modified mixed solution and phenyl trimethyl ammonium chloride are mixed, freeze-dried, grinded and screened to obtain the salicornia herbacea saline-alkaline-tolerant filtrate reducer. The prepared salicornia herbacea saline-alkaline-tolerant filtrate reducer has good temperature-resistant and saline-alkaline-tolerant properties, can effectively reduce filter loss after being used, is good in compatibility, can be matched with various treating agents, therefore is suitable for various drilling fluid systems and has a wide application prospect.

Description

technical field [0001] The invention discloses a preparation method of Salicornia saline-alkali tolerant fluid loss reducer, which belongs to the technical field of preparation of oil field additives. Background technique [0002] With the development of the petroleum industry and the increasing demand for petroleum, oil and gas exploration and development are gradually developing in deep formations and offshore, and drilling engineering is becoming more and more difficult. The specific manifestations are: deep wells and ultra-deep wells have high downhole temperature and pressure, and the formation structure is relatively complex. During the drilling process, high-pressure oil and gas layers and brine layers are often encountered. Under such circumstances, it is difficult for people to solve technical problems such as unstable performance of drilling and completion fluid and high filtration rate. During drilling operations, downhole complex accidents such as downhole collap...

AI Technical Summary

Problems solved by technology

[0005] The technical problem mainly solved by the present invention: aiming at the defect that the traditional fluid loss control agent for drilling fluid has poor salt resistance, and in the drilling fluid with high concentration of organic salt, its fluid loss control effect is poor, and sometimes even completely fails, Provided is a method of fixing and extracting halophytes, collecting the extract of Salicornia tissue and mixing it with the hydrolyzed solution of Salicornia fiber to collect the mixed solution, and improving the salt tolerance of the fluid loss control agent through the salt tolerance of Salicornia tissue fluid At the same time, by grafting organosilicon functional groups in the mixed solution, the high temperature resistance of the fluid loss control agent is effectively improved, thereby preparing a fluid loss control agent that is both high temperature resistant and salt-alkali resistant. After dry milling, mix and fix with glutaraldehyde, then collect the filter cake by filtration and shake it with n-butanol for extraction, collect the extraction filtrate and rotary evaporate to obtain the extract concentrate, then mix the above extraction filter cake with deionized water, cellulase Mix and heat, then filter and collect the filtrate and rotary steam to obtain the hydrolyzed saltwort fiber concentrate, then mix and oscillate it with the extract concentrate, collect the mixed dispersion and heat it with absolute ethanol, and finally mix the obtained modified mixture with phenyl Trimethylammonium chloride is mixed and lyophilized and ground and sieved to obtain a salt-alkali-resistant fluid loss additive of Salicornia saline-alkali. The salt-alkali-resistant fluid loss additive prepared by the present invention has better resistance Salt-alkaline performance, can effectively reduce fluid loss after use, and has good compatibility, and can cooperate with various treatment agents, so it is suitable for various drilling fluid systems and has broad application prospects