Abstract On September 5 and October 19, 2009, there were two drill-and-buckle buckles in the Dabei 301 well. Due to the complicated working conditions in the underground, the hard and soft strata are staggered, and the drilling pressure exceeds the fatigue limit of the drilling tool. Complementing technicians from the lessons of fatigue failure of drilling tools...
thing On September 5, 2009 and October 19, 2009, there were two drill-and-buckle buckles in the Dabei 301 well.
because
The complex conditions of the underground are intertwined, the hard and soft strata are staggered, and the drilling pressure exceeds the fatigue limit of the drill.
Make up
The technicians summarized 15 anti-fatigue measures from the lessons of fatigue failure of drilling tools.
fruit
The failure rate of the 10,000-meter drill has dropped from 0.52 in 2009 to the current 0.23.
"The 15 anti-fatigue measures are analyzed and summarized from the failure of drilling tools, and they are exchanged for lessons. Therefore, it is very effective and effective for preventing the failure of drilling tools." August 11th, Tarim Oilfield Engineering Technology Department Technology Management department Xie Juliang said.
On September 5, 2009, when the Dabei 301 well was drilled into the 7085.6 meters, the drill collar and the male thread were broken. The fish was stuck and could not be salvaged. On October 19, the drill collar was broken again during the sidetracking of this well. The failure of two drills in the Dabei 301 well has become a watershed for reducing the failure rate of drilling tools in the Tarim Oilfield. After this, the technicians continued to find the reason and summed up the experience, so that the drilling footage increased from 519,200 meters in 2009 to 1,547,100 meters in 2013, and the failure rate of the 10,000-meter footage decreased from 0.52 to the current 0.23.
Find the pain of the knot
With the deepening of resource exploration and development in the Tarim Basin, more than 90% of the wells are deep wells or ultra-deep wells, of which ultra-deep wells over 7,000 meters account for 78% of the total ultra-deep wells in China. The geological conditions are complex and the drilling environment is harsh. In particular, the gravel layer in front of the mountain is as hard as diamond, and the salt layer is soft like gum, soft and hard, and changes frequently.
The seemingly hard drill pipe is as soft as a cooked noodle at 7,000 meters underground. After drilling a well, the drill is equivalent to running a marathon. Ultra-deep wells, ultra-high temperature, ultra-high pressure, high sulfur and other downhole complex conditions are all factors that affect the service life of the drill.
The Dabei 301 well has two failures superimposed, delaying the drilling cycle of 2,257 hours, which is equivalent to playing a 6,000-meter well in the basin area. The drilling tool does not lose. The reason is that the complex conditions of the underground are intertwined, the soft and hard strata are staggered, and the drilling pressure exceeds the fatigue limit of the drilling tool.
It hurts. The Tarim people reached a consensus: it is difficult to change the complexity of the geology, and then improve the failure resistance of the drill.
The fatigue failure of drilling tools in the Tarim Oilfield has been in existence for a long time. As early as the beginning of the battle, a batch of drilling engineering technicians began to study the failure mechanism of the fatigue damage of the drilling tools, which was limited by the technical conditions at that time and had little effect.
Anatomical analysis
In 2009, the Tarim Oilfield established a library of drill failure samples and accumulated different forms of drill failure cases. Engineering and technical personnel insist on taking every failure as an opportunity to seek a turnaround. Especially after the failure of two drilling tools in the Dabei 301 well, the technicians summarized 15 anti-fatigue measures from the anatomical analysis of the failed drilling tools over the years.
Drilling tool fatigue is the main cause of fracture failure. 15 anti-fatigue measures have strict regulations on the drilling time of drill pipe drilling tools of different models and different strata. For example, 7-3/4 drills must be replaced after a thorough drilling time of more than 800 hours.
In order not to over-rigid the drilling tools and prevent the drilling tools from entering the well, the engineering and technical department establishes a “health file†for each drilling tool, who, where, when, whether there is a “medical historyâ€, the quality and use of the drilling tools. The situation is effectively controlled and a single root management is applied to the life cycle of the drill.
Fine flaw detection "add zinc and calcium"
Is the drill fatigued and how tired is it? On-site inspection is an important means and the key to enhancing the sensitivity of failure.
During the drilling process of the 62-5H well in Tazhong, when the workload of the design well was two days left, the engineering and technical department urged the well team to immediately start the drilling and testing. The well team was afraid of delaying the time and insisted on drilling the target layer again. With a broken down. Later, when drilling for flaw detection, the technician found a fatigue crack in a drill pipe.
To this end, the engineering and technical department tailored the drill "physical examination" plan according to the drilling conditions and the level of drilling tools, shortening the inspection cycle and increasing the frequency of flaw detection. For example, in the long open hole of the Harahatang and Middle Blocks, in addition to the normal frequency of flaw detection, when the drilling tool enters the 5000m and 6500m strata, an additional flaw detection is added.
"In the thread repair, we control the thread tight distance error to 0.127 mm, and control the thread repair quality with the precision of the hair thread," said Wang Zhixue.
After analyzing the causes of failure of drilling tools under different working conditions, Tarim Oilfield cooperated with domestic research institutes to carry out scientific research, promote the application of new technologies and new processes, and add “zinc and calcium supplements†for drilling tools. The rod "waist" is hard.
Today, high-life drill stabilizers have been fully promoted and the life of drills has increased by 30%. The 127 mm (5-inch) tower standard drill pipe with independent intellectual property rights has been promoted and used in China. The fatigue life of drilling tools has increased by more than 40%, and the drilling water horsepower has increased by about 20%. The girders have been erected in deep wells and ultra-deep wells.
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