Abstract As of June 13th, the 29-2HF well of Jiaolan shale gas field was drilled for 39 days. The domestic technical equipment was used to refresh the shortest drilling cycle in Fuling. "Using our own equipment and our own research and development technology to make shale gas wells...
As of June 13, the 29-2HF well in the Fuling shale gas field was drilled for 39 days, and the domestic technical equipment was used to refresh the shortest drilling cycle in the Fuling area. "Using our own equipment and our own research and development technology, we have made shale gas wells so good and work better!" Jiang Han Petroleum Engineering Company 50787JH drilling captain Liu Wei proudly said. At present, in addition to the bridge plug, the equipment and tools for drilling, logging, and downhole operations required for the commercial development of Fuling shale gas have all been localized. As the main petroleum engineering technical service provider of the Fuling shale gas demonstration area, the petroleum engineering company has developed its own technology and domestic equipment to serve shale gas development, which has been well received by experts in the industry. A shale gas exploration and evaluation expert from ExxonMobil said: "Sinopean marine shale gas exploration and development technology in southeastern Sichuan is first-class and has already taken the lead in the world."
Self-owned drilling technology system realizes “hundred steps to wear Yangâ€
How can we safely and efficiently open shale gas reservoirs buried deep in the depth of more than 4,000 meters?
First, the rig is drilled from the ground to the shale gas layer, and then walks through the shale gas layer at a level of more than 1,000 meters to reach the shale gas enrichment area. As the saying goes, "It is difficult for heaven to enter the earth." In addition, there are many underground caves in the Jiaoshiba area, many dark rivers, many cracks, and the shale gas layer is easy to collapse. The drill bit must hit the bull's eye in such a complicated stratum. Imagine it.
“Remember that when we started to work on shale gas horizontal wells in 2011, we couldn’t master a lot of drilling technology. We could only get money from foreign companies.†Wang Wei, a drilling expert at Jianghan Petroleum Engineering Co., recalled drilling Sinopec in 2011. The experience of a shale gas horizontal well.
In order to reduce drilling costs and achieve efficient production, the technical experts of petroleum engineering companies began to optimize the horizontal well orientation technology and cementing technology to carry out localized drilling technology system.
In the horizontal well orientation technology, they formed a wellbore trajectory optimization technology, wellbore trajectory control technology, domestic PDC bit orientation technology, foam orientation and other technical series, achieving a drilling and completion construction of 1500m~2000m horizontal section. The target, the drilling speed is significantly faster.
Drilling fluid is the "blood" of drilling. Due to the special geological structure of the shale formation, the rock formation is likely to collapse if conventional water-based drilling fluid is used during horizontal drilling. Switching to oil-based drilling fluids can solve this problem well. The oil engineering company's R&D team independently developed oil-based mud, which greatly reduced drilling costs.
In this regard, Zhongzhong Engineering Company's drilling expert Li Zhongshou also deeply felt that he said: "In 2012, the US company sold us oil-based drilling fluid for one cubic meter of more than 20,000 yuan. Now we independently develop oil-based drilling fluid. One cubic meter is only 9,000 yuan."
Guided by “Pavement Bridge†with its own logging technology
Logging technology is the "eye" of oil and gas development, and the development of shale gas is inseparable from the fine logging technology. For the development of shale gas, Jianghan Petroleum Engineering Company has formed localization of long horizontal section logging, crawler logging, integrated guiding logging, pyrolysis chromatography, nuclear magnetic resonance logging and shale gas logging comprehensive evaluation and interpretation. Technically composed of logging and logging technology series.
The crawler logging technology is a method of using a crawler in a cased hole to send the instrument from the position that cannot be lowered by its own gravity to the target layer for logging. It is a horizontal logging technology with large safety factor and time and labor saving. It can solve the problem of cementing quality detection in the horizontal section of shale gas.
“The initial test of the latent page Ping 2 well crawled only 430 meters, while the focal page 12-4HF well created a record of 1952.56 meters. Our goal is to constantly surpass ourselves.†Jianghan Petroleum Engineering Company JH-CJ024 team captain Zhang I am proud to say.
Use domestic equipment to turn gas reservoirs into "capsules"
In view of many technical difficulties such as complex strata, easy well leakage, long horizontal section and easy shale in the Fuling area, the petroleum engineering company implements an integrated solution for shale gas development and equipment, and organically combines shale gas development equipment with petroleum engineering technology. Independent research and development has designed a number of sophisticated equipment including well factory drilling equipment, large-scale reservoir transformation equipment, large-capacity coiled tubing equipment, and pressurized working equipment, providing powerful equipment for efficient, low-cost and large-scale development of shale gas. support.
For the “well factory†construction mode of multiple wellheads on one platform, they independently developed wheel-rail drilling rigs and step-type drilling rigs to realize rapid movement and relocation of rigs between different wellheads. The wheel-rail drilling rig installs the drilling rig and all the supporting equipment on the wheel rails, and uses the moving oil cylinder to push the drilling machine to continuously shift. It saves 6 days compared with the conventional relocation method, and creates the “relocation on the same day, rectification on the same day, and opening on the same day. Drill" record.
Their self-designed omni-directional step-type interwell transport device realizes step-by-step translation by using the lifting cylinder and the translation liquid cylinder to push and pull on the base of the drilling rig to realize the drilling machine in multiple wells and irregularities. The whole machine relocation between the wells can shorten the rig's interwell transfer time from 5 days to 3 hours, effectively shortening the drilling operation cycle.
In view of the soft and hard staggered stratum characteristics of the Jiaoshiba work area, they developed gradient alloy tooth technology and composite sheet technology, and introduced long-life, high-torque wall thickness screw drills, high-speed turbines + impregnated PDC drill bits, and drill drills. With a full well contracting program, the success rate of each drill is improved.
In view of the high pressure, large displacement and long working time of shale gas pressure cracking construction, they advanced the development of high-power 3000 type fracturing trucks, large-displacement sand mixing vehicles and other fracturing equipment, and implemented the "large-scale fracturing unit. Auxiliary equipment engineering integrated control and 'zipper type fracturing' technical solution to achieve process fracturing between multiple wellheads, effectively reducing the footprint of the well site.
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