为了提高水基钻井液体系中淀粉的热稳定性,在其中添加单乙醇胺,并对其效果进行了室内实验研究。研究表明,单乙醇胺的存在使钻井液的表观黏度、塑性黏度、动切力、静切力等提高,且显著降低了钻井液的滤失速率、减小了泥饼厚度。通过与淀粉聚合物建立氢键,单乙醇胺的存在可以避免高温下淀粉的水解,提高淀粉的热稳定性。淀粉作为天然聚合物可以提高钻井液流变性能、降低滤失量,但其发挥作用的最高温度仅为121 ℃,而单乙醇胺会使淀粉的耐温提高至160 ℃。单乙醇胺存在最佳浓度,高于最佳浓度时,其功效会下降。图12参14
NASIRI Alireza
,
NIK Mohammad Amin Sharif
,
HEIDARI Hamidreza
,
VALIZADEH Majid
. 单乙醇胺对水基钻井液体系中淀粉热稳定性的影响[J]. 石油勘探与开发, 2018
, 45(1)
: 157
-160
.
DOI: 10.11698/PED.2018.01.17
To improve the thermal stability of starch in water-based drilling fluid, monoethanolamine (MEA) was added, and the effect was investigated by laboratory experiment. The experimental results show that the addition of monoethanolamine (MEA) increases the apparent viscosity, plastic viscosity, dynamic shear force, and static shear force of the drilling fluid, and reduces the filtration rate of drilling fluid and thickness of mud cake apparently. By creating hydrogen bonds with starch polymer, the monoethanolamine can prevent hydrolysis of starch at high temperature. Starch, as a natural polymer, is able to improve the rheological properties and reduce filtration of drilling fluid, but it works only below 121 ℃. The MEA will increase the thermal stability of starch up to 160 ℃. There is a optimum concentration of MEA, when higher than this concentration, its effect declines.
[1] AL-MALKI N, POURAFSHARY P, AL-HADRAMI H, 等. 采用海泡石纳米颗粒控制膨润土基钻井液性能[J]. 石油勘探与开发, 2016, 43(4): 656-661.
AL-MALKI N, POURAFSHARY P, AL-HADRAMI H, et al. Controlling bentonite-based drilling mud properties using sepiolite nanoparticles[J]. Petroleum Exploration and Development, 2016, 43(4): 656-661.
[2] THOMAS D C. Thermal stability of starch and carboxymethyl cellulose-based polymers used in drilling fluids[J]. SPE Journal, 1982, 22(2): 171-180.
[3] ZHANG C G. Preparation of pregelatinized starch for oilfield drilling[J]. Petroleum Drilling Techniques, 1986, 14(2): 25-29.
[4] ZHANG C G. Properties of pregelatinized starch for oilfield drilling[J]. Petroleum Drilling Techniques, 1986, 14(3): 44-47.
[5] WURZBURG O B. Modified starches: Properties and uses[M]. Boca Raton: CRC Press, 1986.
[6] LIU X, WANG Y, YU L, et al. Thermal degradation and stability of starch under different processing conditions[J]. Starch-Stärke, 2013, 65(1/2): 48-60.
[7] WARD I, CHAPMAN J W, WILLIAMSON R. New viscosifier for water based muds based on a genetically modified starch[R]. SPE 50723-MS, 1999.
[8] ISMAIL I, IDRIS A K. The prospect of utilising local starches as fluid loss control agents in the petroleum industry[C]//Proceedings of Regional Symposium on Chemical Engineering. Johor, Malaysia: UTM, 1997.
[9] OGUGBUE C E, RATHAN M P, SHAH S N. Experimental investigation of biopolymer and surfactant based fluid blends as reservoir drill-in fluids[R]. SPE 128839-MS, 2010.
[10] LUIS P. Use of monoethanolamine (MEA) for CO 2 capture in a global scenario: Consequences and alternatives[J]. Desalination, 2016, 380: 93-99.
[11] PREVENTION I P. Control reference document on best available techniques for the manufacture of organic fine chemicals: Ammonia, acids and fertilisers[R]. Seville: European IPPC Bureau, 2007.
[12] BARA J E. What chemicals will we need to capture CO 2 ?[J]. Greenhouse Gases Science & Technology, 2012, 2(3): 162-171.
[13] JAIN R, MAHTO V. Evaluation of polyacrylamide/clay composite as a potential drilling fluid additive in inhibitive water based drilling fluid system[J]. Journal of Petroleum Science & Engineering, 2015, 133: 612-621.
[14] HYLKE S, GERHARD S, ALI G. Role of starch in designing nondamaging completion and drilling fluids[R]. SPE 73768-MS, 2002.
