It is difficult to determine the optimal weight on bit (WOB) of the double-driven bottomhole assembly (DD-BHA, with double stabilizers and a bent housing positive displacement motor (PDM)) which is employed during ver...It is difficult to determine the optimal weight on bit (WOB) of the double-driven bottomhole assembly (DD-BHA, with double stabilizers and a bent housing positive displacement motor (PDM)) which is employed during vertical and fast drilling. High WOB leads to well deviation out of control, and low WOB leads to low rate of penetration (ROP). So considering the rock physical properties, the anisotropy index function of polycrystalline diamond compact (PDC) bit was derived with the structure and cutting performance parameters of the bit, and the effect of natural hole deviation tendencies on the performance of DD-BHA resisting deviation was represented. The concept of elliptic deformation ratio was used to characterize the performance of DD-BHA resisting deviation. Eventually, a model calculating the critical WOB was established. By comparing the model predictions with the measured hole angle changes in the field, the results show that the model predictions are accurate with error less than 5.8%, which can meet the operational requirements in the projects. Furthermore, the model was adopted to justify and guide the operating conditions and parameters during drilling, which shows that the optimum WOB predicted by the model can not only control deviation but also improve ROP effectively. The model is independent on the formation characteristics of blocks, so it can be expanded widely to other oilfields.展开更多
为解决渭北油田长3储层埋深浅、水平井水垂比高带来的摩阻大、井眼轨迹控制难等问题，开展了浅层高水垂比水平井钻井设计研究。在分析主要钻井技术难点的基础上，对不同尺寸井眼的摩阻和扭矩进行了数值模拟，将待钻井设计为三开井身结...为解决渭北油田长3储层埋深浅、水平井水垂比高带来的摩阻大、井眼轨迹控制难等问题，开展了浅层高水垂比水平井钻井设计研究。在分析主要钻井技术难点的基础上，对不同尺寸井眼的摩阻和扭矩进行了数值模拟，将待钻井设计为三开井身结构，三开水平段采用φ215.9 mm钻头钻进；为了确保准确着陆入靶，根据长3储层的地质特征，采用双增井眼剖面；根据各开次钻遇地层的特征和钻井要求，一开井段采用塔式钻具组合，二开和三开井段采用倒装钻具组合，加重钻杆放在井斜角为45°～60°的井段内；根据渭北油田钻遇地层的特点，采用钾铵基聚合物钻井液，水平段控制钻井液滤失量小于5 mL ；为降低钻井成本，充分利用现有钻井设备，选用ZJ30型非顶驱钻机。现场应用表明，利用常规钻井装备，采用上述钻井设计，解决了渭北油田长3储层浅层水平井钻井中存在的问题，实现了长3储层的有效开发。展开更多
基金Projects(50804040,51004082)supported by the National Natural Science Foundation of China
文摘It is difficult to determine the optimal weight on bit (WOB) of the double-driven bottomhole assembly (DD-BHA, with double stabilizers and a bent housing positive displacement motor (PDM)) which is employed during vertical and fast drilling. High WOB leads to well deviation out of control, and low WOB leads to low rate of penetration (ROP). So considering the rock physical properties, the anisotropy index function of polycrystalline diamond compact (PDC) bit was derived with the structure and cutting performance parameters of the bit, and the effect of natural hole deviation tendencies on the performance of DD-BHA resisting deviation was represented. The concept of elliptic deformation ratio was used to characterize the performance of DD-BHA resisting deviation. Eventually, a model calculating the critical WOB was established. By comparing the model predictions with the measured hole angle changes in the field, the results show that the model predictions are accurate with error less than 5.8%, which can meet the operational requirements in the projects. Furthermore, the model was adopted to justify and guide the operating conditions and parameters during drilling, which shows that the optimum WOB predicted by the model can not only control deviation but also improve ROP effectively. The model is independent on the formation characteristics of blocks, so it can be expanded widely to other oilfields.
文摘为解决渭北油田长3储层埋深浅、水平井水垂比高带来的摩阻大、井眼轨迹控制难等问题，开展了浅层高水垂比水平井钻井设计研究。在分析主要钻井技术难点的基础上，对不同尺寸井眼的摩阻和扭矩进行了数值模拟，将待钻井设计为三开井身结构，三开水平段采用φ215.9 mm钻头钻进；为了确保准确着陆入靶，根据长3储层的地质特征，采用双增井眼剖面；根据各开次钻遇地层的特征和钻井要求，一开井段采用塔式钻具组合，二开和三开井段采用倒装钻具组合，加重钻杆放在井斜角为45°～60°的井段内；根据渭北油田钻遇地层的特点，采用钾铵基聚合物钻井液，水平段控制钻井液滤失量小于5 mL ；为降低钻井成本，充分利用现有钻井设备，选用ZJ30型非顶驱钻机。现场应用表明，利用常规钻井装备，采用上述钻井设计，解决了渭北油田长3储层浅层水平井钻井中存在的问题，实现了长3储层的有效开发。
