Well drilling pressure control facility and operation method of ultra-deep well

Abstract

The invention discloses a well drilling pressure control facility and operation method of an ultra-deep well. The well drilling pressure control facility comprises a mud input pipeline, a first mud reversing out pipeline, a second mud reversing out pipeline, a kill line, a back pressure pipeline, a throttle pipeline, and a well control device; the operation method comprises the steps that a normaldrilling mode is conducted, the normal drilling mode is converted to a single root mode, the normal drilling mode is converted to a drilling starting mode, a drilling downward mode and a valve element changing mode; and control equipment eliminates a backpressure pump and other facilities, a throttle pipeline control device is simplified, the facility cost is lowered, the on-site construction process is simplified, and the stress control aspect is safer and more efficient. The well drilling pressure control facility and operation method can decrease the degree of well leakage, the difficultyof plugging is reduced, Chinese oil and gas standards are met, and the safe drilling purpose is achieved.

Description

technical field [0001] The invention relates to the field of petroleum development, in particular to an ultra-deep well drilling pressure control device and an operation method. Background technique [0002] With the rapid development of drilling technology, the development trend of oil exploration in the world has changed from shallow wells to deep wells and ultra-deep wells, especially in the western region (Tarim, Tahe, Tuha and Sichuan) where the oil resources account for the total of the country. The resource volume is 38%, and the proven rate is only 9%. It is the main replacement area for domestic oil production. Especially, the oil and gas reservoirs in Tarim and other places are all in the formation depth of 6,000 to 7,000 meters, so they must be developed by ultra-deep wells. Ultra-deep wells refer to wells with a depth of 6000m to 8000m. [0003] The deeper the well, the more sensitive the formation is to the density of the drilling fluid. During the drilling pro...

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Problems solved by technology

[0006] Conventional drilling methods are equipped with simple drilling equipment and low operating cost, but the wellhead cannot apply back pressure, so they are not suitable for high-temperature, high-pressure, ultra-deep wells with narrow pressure window formations; precision managed pressure drilling equipment is used to drill wells in high-temperature, high-pressure, ultra-deep wells with narrow pressure window formations During the process, the wellbore pressure can be effectively controlled by adjusting the wellhead back pressure, but there are problems such as complex equipment, large equipment loss, high drilling cost, and the need for a professional team for on-site implementation, making it difficult to promote

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