Well completion knowledge - Baidu
2017-05-25 12:03
Completion work
Well completion (well completion) refers to the open hole drilling design wells, so that the bottom of the hole and the oil layer to a certain structure connected to the process. Is the last important part of the drilling work, but also the beginning of the oil production project, with the subsequent oil production, water injection and the development of the entire oil and gas fields are closely linked. The quality of the well completions directly affects the production capacity and economic life of the well, and even relates to whether the whole oil field can be developed reasonably.
basic introduction
Completion of the final part of the drilling project. In oil extraction, oil and gas well completion includes drilling of the oil layer, the completion of the selection and cementing, perforating operations. For the low permeability of the production layer or by the mud seriously polluted, the need for acidification, hydraulic fracturing and other stimulation measures to be completed.
Completion method
According to the geological characteristics of the production layer, using different completion methods:
① perforation completion method. That is, drilling oil, gas layer, into the casing after casing, cementing the production layer after the perforation, this method is the most widely used.
② open hole completion method. That is, under the casing to the top of the production layer for cementing, production intervals exposed completion method. This method is used for carbonate rock, hard sandstone and cementing is better, relatively simple layer of the reservoir. The advantage is that the production layer exposed area, oil, air into the well of the resistance is small, but not suitable for different nature, different pressure of the multi-layer. According to the drilling of the production layer and the time into the casing, the naked eye completion method is divided into early naked eye completion method and late naked eye completion method.
③ liner completion method. That is, the casing casing down to the top of the production layer for cementing, and then drilled the production layer, into the hole with the lining of the production, this completion method has sand control effect.
④ gravel filling and completion method. Between the lining and the borehole wall to fill a certain size and quantity of gravel.
We usually refer to the completion of the completion of Well Completion (Well Completion) is the completion of oil and gas wells, that is, according to the geological characteristics of oil and gas and development and mining of technical requirements, in the bottom of the establishment of oil and gas wells and oil wells Reasonable connection between channels or connectivity.
And now the significance of the completion of a certain expansion, including drilling and completion of the completion of well completion. Production completion is mainly refers to the drilling after completion of how to select the column, wellhead, choose what kind of pipe, wellhead, etc. to achieve the normal production of oil and gas wells.
