Bringing back the 'golden doll' in the 'experimental field', a documentary on the tight gas field construction of Chuanqing Drilling and Changqing Drilling in the 'experimental field'

Just after National Day, the enthusiasm for the oil and gas front in the Ordos Basin has not diminished. In the Jingzhongbei block, the derrick of the 50624 drilling team of Changqing Drilling Company of Chuanqing Drilling Company stands tall and straight. We have produced 'six golden flowers' with a daily output of one million cubic meters in the G3-15 well group. At this well site, we also want to hold more' golden dolls'. ”The vice captain of the team, Xie Hongbin, appears very confident.

The drill bit does not reach, and the oil and gas do not leak. As a key project for the second accelerated development of Changqing Oilfield, tight gas has been extensively drilled since the beginning of this year. Changqing Drilling Company has gathered a large number of troops and selected 14 teams to enter the construction block. A total of 58 wells have been completed this year, with a drilling footage of 250000 meters and an overall speed increase of 32%. While promoting the rapid production of the oil field, a large number of high-yield wells have been born, truly turning this "experimental field" of tight gas into a "high-yield field".   

emancipate

Technological innovation unleashes new momentum for accelerating and improving quality

Compared with conventional gas wells, tight gas is developed in a three-dimensional manner with large well clusters and multiple layers. The horizontal section mostly exceeds 2000 meters, with 4 to 10 wells in each well group. Multiple well types are deployed in a "mixed and matched" manner, and multiple drilling rigs are used on the same platform for construction. On the premise of ensuring that the wellbore trajectory is in line with the target, the drilling team promotes continuous acceleration of all layers in the entire well section.   

Through measures such as strengthening parameters in the vertical section, reducing sliding in the inclined section, and reducing support pressure in the horizontal section, every meter has become a growth point for speed increase, "said He Hang, director of the technical office of the third project department of this company. Speed increase is a systematic project, and only by breaking the cage of inertia thinking and freeing up drilling parameters to the maximum extent possible under equipment conditions can new kinetic energy for speed increase and quality improvement be released.   

Starting from the surface, the construction team broke the routine and switched from hanging drilling to pressurized drilling, allowing the drill bit to fully penetrate the formation and significantly improve rock breaking efficiency. "In the past, in order to ensure stability, the oblique pendulum tool face was always built at the cost of the weight on bit, and the bit could not fully eat into the formation, which was inefficient." He Hang introduced that this year, he changed this operation mode, increased the weight on bit, adjusted the tool face in rapid drilling, and the efficiency in this process was improved by more than half.   

The ability to quickly drill wells tests one's ability to read geological formations. If the horizontal section encounters mudstone during drilling, it will cause severe pressure, which not only reduces the efficiency of drilling, but also easily leads to mud entrapment of the drill bit, "He Hang said. In response to this problem, they actively contacted manufacturers to design and develop drill bits with fewer blade wings and stronger aggressiveness, and explored the combination of" oscillation increasing inclination "drilling tools, specializing in drilling and effectively solving these problems.   

The application of directional gamma and near bit geological guidance tools has effectively improved the drilling encounter rate of reservoirs. This company uses its self-developed CQSP-5 environmentally friendly drilling fluid system to drill in the horizontal section, avoiding the use of heavy materials such as barite and effectively protecting the reservoir. At present, the drilling rate of the tight gas straight section of this company has reached 90.9% per trip, and the drilling rate of the inclined section has reached 45.45% per trip. According to the previous gas testing results, high-yield well clusters that hit the "valve" have emerged, adding momentum to the increase in reserves and production of the oilfield.   

lean management

Seamless connection of various links in production organization

The drill bit relies on technology to speed up inside the wellbore. In the production organization, this company adopts a series of supporting management measures to incorporate organizational speed into the standard template. Among them, the development of the "Lean Management Single Well Construction Process Table" divided the entire well into 8 processes, 18 procedures, and 113 steps, achieving assembly line operation.   

Every process is meticulously calculated, and what three people can do will not result in a fourth person. We are busy but not chaotic, and fast but not 'collide'. "Ni Peizeng, the captain of the 50290 drilling team, tasted the sweetness of lean management in practice. According to him, when the wellhead reaches the designated position, various connecting pipelines are quickly connected, and every time the wellhead is moved, it is controlled within one day.