Study on Property Control of High Density Drilling Fluids Based on Modified Alferd Model
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摘要: 针对深井高温高密度钻井液性能难以调控的问题,探讨了重晶石级配对高密度钻井液流变性和滤失性能的影响规律及作用机理。基于分形理论,对粉体堆积常用的Alfred方程进行修正,建立了适用于重晶石级配加重的粒度分布模型,计算了重晶石级配的理论最优配比,并通过实验验证了修正模型的可行性。实验表明,修正后的Alferd模型可以指导高密度钻井液的颗粒级配设计,确定加重材料最优级配比例。使用合理级配的重晶石加重,可以降低钻井液内部颗粒间的碰撞概率及储能模量,削弱体系的网架结构和流动阻力,并使重晶石的粒度分布更加合理,有利于形成致密泥饼,从而改善钻井液的流变性能和滤失性能。Abstract: The effect of barite particle sizing on the rheology and filtration property of a high density drilling fluid and the mechanisms of this effect are investigated to try to solve the difficulties encountered in controlling the performance of a high density drilling fluid used in drilling a deep high temperature well. Based on the fractal theory, the Alfred equation, which is generally used in powder packing calculation, was modified to establish a particle size distribution model suitable for weighting a drilling fluid with sized barite particles, the theoretical optimal quantity ratio of the sized barite particles was calculated, and the feasibility of the modified model was verified by experiment. Laboratory experiment shows that the modified Alferd model can be used to guide the design of the sizing of particles used to weight a drilling fluid and to determine the optimum quantity ratio of particles with different sizes. Weighting a drilling fluid with reasonably sized barite particles can reduce the probability of collision between particles in the drilling fluid and the storage modulus, weaken the network structure and the flow resistance of the system, and make the particle size distribution of barite more appropriate; it is beneficial to the formation of dense mud cakes, and to the improvement of drilling fluid rheology and filtration property.
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Key words:
- Drilling fluid /
- Barite /
- Alferd model /
- Particle size distribution /
- Rheological property /
- Filtration property
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表 1 不同粒径重晶石的粒度分布
粒径/目 D10/μm D50/μm D90/μm 200 1.881 11.530 39.500 1250 1.662 3.879 18.420 3000 0.365 1.593 4.413 表 2 200目与1250目重晶石级配 加重对实验浆流变性的影响
200目重晶石/
%老化条件
(180 ℃/16 h)AV/
mPa·sPV/
mPa·sYP/
PaGel/
Pa/Pa100 老化前 80.0 62 18.0 3.5/8.5 老化后 70.0 64 6.0 2.5/6.0 80 老化前 77.0 61 16.0 5.0/8.5 老化后 87.0 60 7.0 2.7/6.5 70 老化前 74.5 66 8.5 4.0/8.0 老化后 65.0 59 6.0 2.7/6.0 50 老化前 68.5 58 10.5 4.0/10.0 老化后 58.0 52 6.0 2.7/5.0 30 老化前 72.0 60 12.0 4.0/8.0 老化后 59.5 53 6.5 2.5/5.0 20 老化前 76.0 62 14.0 6.0/8.5 老化后 56.5 52 4.5 2.5/4.5 0 老化前 84.0 68 16.0 8.0/12.5 老化后 63.5 60 3.5 4.5/8.0 注:流变性能测试温度为49 ℃;中压和高温高压滤失量测试条件分别为室温、0.7 MPa和150 ℃、3.5 MPa 表 3 200目与3000目重晶石级配 加重对实验浆流变性的影响
200目重晶石/
%老化条件
(180℃/16h)AV/
mPa·sPV/
mPa·sYP/
PaGel/
Pa/Pa100 老化前 80.0 62 18.0 3.5/8.5 老化后 70.0 64 6.0 2.5/6.0 80 老化前 64.0 52 12.0 4.0/8.0 老化后 50.0 44 6.0 2.5/4.5 70 老化前 60.0 49 11.0 4.0/8.0 老化后 49.0 42 7.0 5.5/9.5 50 老化前 61.5 49 12.5 3.5/7.0 老化后 49.5 40 9.5 3.5/7.0 30 老化前 76.0 62 14.0 6.0/8.5 老化后 65.5 52 12.0 2.5/4.5 20 老化前 93.0 63 30.0 16.0/25.5 老化后 65.5 48 17.5 11.5/23.5 注:当3000目加量为100%时,黏度过高无法测量;流变性能测试温度为49 ℃;中压和高温高压滤失量测试条件分别为室温、0.7 MPa和150 ℃、3.5 MPa -
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