The second super slim hole trajectory control test was successfully carried out by Cavaville
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On December 4th, 2018, cooperated with Tarim oilfield, Cavaville carry out the project (super slim hole (4 1/8 "-4 3/4") directional drilling technology research and field test) whose second well test of YueM702C has been completed successfully, marking the success of this project.
The well once again broke the 114.3mm super-slim hole depth record set by Cavaville.
YueM 702C well in Tarim basin O 'Hara Hatang oil field, which is a casing sidetracking directional well. Its fourth section is 7383 m - 7485m, and the super slim hole is 114.3 mm, whose designed well depth is 7584 m, TVD is 7480m deep, 5 ° slope / 30 m. Because the directional section is limited by the well size, the annulus pressure consumption is large, the displacement is low, and the cuttings return is difficult, the formation of cuttings bed is very easily to build, resulting in pressure difference and stuck.
The actual drilling depth is 7429.51m, the measured bottom hole temperature 157 ℃, the highest circulating temperature is 150 ℃, the displacement is 7.8 L/s, the density is 1.71 g/cm3, the pump pressure is 19-20 mpa, and the biggest build-up rate can be up to 12-15°/30 m. The instrument signal intensity, and collar heat resistance has been proved.
Super slim borehole has extremely strict requirements on MWD instruments and collars. Severe vibration, impact, vortexing and supporting pressure are easy to cause vibration crack failure of MWD instrument components. At the same time, high temperature on the super slim size of the collar is also a test.
Since 2016, our company has started the domestic and foreign research work of super slim hole directional drilling. Through repeated communication and discussion with top drilling experts, scholars and technicians of instrument and equipment manufacturers in China and abroad, we have finally formed a set of supporting technologies and equipment suitable for super slim hole directional drilling. The MWD, non-magnetic drill collars, joints and other equipments used in this test are all imported.
In order to successfully complete the scientific research, our company's technical team worked on the pre-construction plan, the construction process control, and the re-drilling on paper after construction to ensure that there is no error on whether it is the trajectory control of the small hole or the configuration of instruments and equipment.
With the completion of the fourth high-temperature super deep slim hole well and the third super deep slim hole test, Cavaville has accumulated certain experience in the construction of high-temperature super deep slim hole. In the future service, we will continue to adhere to the concept of "sharing and win-win" cooperation to provide customers with the best quality service.