The Prepartion Of Guar Gum Derivatives And Application Research

At present, the oil reservation is becoming less and less. Shallow oil and gas in our country is increasingly drying up, and oilfield exploration begins to transfer towards the complex strata, deep well, ultra deep well and marine. Oil well cementing is one of the most important processes in the construction of a well bore. To ensure the safety of cementing job, various additives such as fluid loss additive are used to improve the performance of cement slurries and meet the requirements of cementing. The fluid loss additive can control the loss of water from the cement slurry to porous formations and thus prevent the cement slurries from dehydrating. The common fluid loss additive mainly includes inorganic granular materials, water-soluble modified natural polymers and synthetic polymers. Because the AMPS monomers have excellent heat resistance and salt resistance, the synthesis of binary, ternary water-soluble polymer based on AMPS has become a hotspot of research. However, the research of forpolymer based on AMPS is still few. This study focused on the synthesis of forpolymer based on the AMPS.(1) Through orthogonal and single factor experiment in the filtration performance test, we obstained the optimal synthesis conditions of the forpolymers P(AMPS/NVP/AA/AM) as follows: mole ratios of monomers AMPS: NVP: AA: AM are 1:1:1:2. The optimal p H value, time and temperature of reaction system are 11.0, 4 hours and 90℃, respectively. Nuclear magnetic resonance and infrared spectrum were used to characterize and confirm the forpolymer has been synthesized successfully.(2) Using BROOK FLELD rotational viscometer tested the viscosity of aqueous solution with P(AMPS/NVP/AA/AM) of different concentration at different temperature. It was found that viscosity of polymer solution increased with the increase of concentration and decreased with the rise of temperature.(3) In order to further study the relationship between polymer structure and performance, monomer DEAM and DMAM were respectively used instead of AM to synthesize P(AMPS/NVP/AA/DEAM), P(AMPS/AA/NVP/DMAM). The structure characterization successfully verified the structure of the different forpolymers.(4) The fluid loss performance analysis showed that, when the dosages of the P(AMPS/NVP/AA/AM) and P(AMPS/NVP/AA/DMAM) forpolymer were 0.5% of the fresh water cement slurry at 26.7℃, the fluid loss can be controlled about 60 m L and 68 m L, respectively, while the fluid loss of P(AMPS/NVP/AA/DEAM) forpolymer can be controlled in 112 m L. When the dosages of the P(AMPS/NVP/AA/AM) and P(AMPS/NVP/AA/DMAM) forpolymer were 1.0% of the brine water cement slurry at 93.3℃, the fluid loss can be controlled about 68 m L and 64 m L, respectively, while the fluid loss of P(AMPS/NVP/AA/DEAM) forpolymer can be controlled in 96 m L.(5) The thickening time tests showed that, when the dosage of the forpolymer was 0.5% of the fresh water cement slurry at 51.6℃, the thickening time of the P(AMPS/NVP/AA/DEAM) can be controlled about 178 mins more than P(AMPS/NVP/AA/AM) 166 mins and P(AMPS/NVP/AA/DMAM) 158 mins. When the dosage of the forpolymer was 1.0% of the brine water cement slurry at 51.6℃, the thickening time of the P(AMPS/NVP/AA/DEAM) can be controlled about 271 mins more than P(AMPS/NVP/AA/AM) 266 mins and P(AMPS/NVP/AA/DMAM) 264 mins.Synthesis of water-soluble forpolymers in this study has a mild reaction condition, simple process and no pollution to the environment. As a fluid loss additive, it has huge potential commercial value.