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钻井时,在其他条件相同的情况下,机械钻速随着泥浆有效粘度的下降而增加。但是克拉斯诺达尔边区东北部3、4和7号井的钻进结果表明,对于加重泥浆来说,机械钻速与其流变参数的关系需要加以证实和校正。 在3号井和7号井上,一个行程的钻井技术参数实际上不变时,机械钻速是随泥浆流变参数的改变而改变(图1)。在一个行程开始,当泥浆由于其触变结构破坏不那么剧烈而具有较高的有效粘度时,发现机械钻速较高。正因为如此,这一点在多数研究情况中均能看到,可以推断,泥浆的有效粘度较之其以水力冲击作用破坏地层过程所需的优选值偏低。
When drilling, the ROP increases with decreasing effective slurry viscosity, under the same conditions. However, drilling results for wells No. 3, No. 4 and No. 7 in the northeastern Krasnodar margin show that the relationship between ROP and its rheological parameters needs to be verified and corrected for the heavier slurries. In wells 3 and 7, when the drilling parameters for one run are virtually unchanged, the ROP changes as the mud rheology parameter changes (Figure 1). At the beginning of a trip, when the mud is less violent due to its thixotropic structure and has a higher effective viscosity, it is found that the ROP is higher. For this reason, as can be seen in most studies, it can be inferred that the effective viscosity of mud is lower than the preferred value required for destroying the formation by hydraulic impact.