摘要:
AD205H井是伊拉克艾哈代布油田的首口简化三开水平井,上部水敏泥岩易分散造浆、缩径,中部存在高压盐水层、燧石结核地层,储层灰岩含量高,从而增加了施工周期,制约了该区水平井发展步伐。针对上述钻井难点,开展了钻井液抑制性、抗温性、抗盐性、抗污染评价试验,研制了混油聚磺钻井液体系。现场应用表明,聚磺钻井液体系抗污染能力强,施工过程中性能稳定。对于上部水敏性泥浆有很强的抑制作用,对于下部易渗漏的灰岩地层有很好的封堵作用,减少了井下复杂事故的出现。此井为该地区简化井身结构第一口井,低密度优质钻井液保证了该井的顺利施工,创造了该油田钻井施工的多项纪录。
Abstract:
AD205H is the first simplified three-spuding horizontal well in Al-ahdab oilfield of Iraq.Upper water sensitive mudstone is easily being dispersed and mud forming with diameter reducing;high pressure salt water layer, chert nodule beds and oil reservoir with high content of limestone increase the construction cycle and restrict the application of horizontal wells in this area.Aiming at the above difficulties, evaluation tests on the drilling fluid inhibitory, temperature resistance, salt resistance, anti pollution were made, the mixed oil polysulfonate drilling fluid system was developed.Field application shows that polysulfonate drilling fluid system has strong antipollution ability with stable performance in the construction process, which has strong inhibition on water sensitivity mud of the upper part and very good sealing effect for lower lime-stone formation;downhole accidents are reduced.
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