The reporter learned from the Qinghai Oilfield Branch of China National Petroleum Corporation (hereinafter referred to as the “Qinghai Oilfieldâ€) on the 15th that the volume fractures of 38 horizontal wells of 5 horizontal wells in the Qinghai Oilfield that were recently implemented in the Qinghai Oilfield have been successful, accumulatively increasing oil by 17,500 tons. . So far, this independently developed reservoir reformation technology has become the “propeller†for high-temperature, high-pressure, and high-salt reservoirs in the West of the country.
According to the introduction of Qinghai Oilfield, the exploration area of ​​1,000 square kilometers in Hero Ridge is the main battlefield for the construction of a 10-million-ton plateau oil and gas field in Qinghai Oilfield in the next three years, while crude oil production in the West of the block is the “leader†in increasing production and efficiency. For this reason, the oilfields developed the process of reservoir reconstruction technology around the high temperature, high pressure, and high salt "three highs" characteristics of the Zhouyi reservoir of Hero Peak, and achieved a breakthrough. In particular, the reconstruction of the reservoir in the West of the West has undergone three stages of acidification, acid pressure, and fracturing. At present, it has formed a vertical well + horizontal well volume fracturing reservoir reconstruction characteristic process technology, and has achieved vertical well fracturing control reserves. Horizontal wells benefit the development of double harvest results.
At the same time, on the basis of summarizing the experience of fracturing transformation of tight oil in Zhaha Springs, the horizontal wells deepen the combination of engineering and geology, establish a three-dimensional geological model, and adopt the “geological and engineering integration†research ideas to effectively combine “geological sweets†and “engineering “Sweetâ€, preferred two fracturing processes for “holeless packer†and “sleeve sleeveâ€, with volumetric fracturing with “large liquid volume, large displacement, high pre-liquid ratio, slickwater + jelly†The idea is to maximize the contact between the artificial fracture and the reservoir. At the same time, in order to ensure the best transformation results, underground micro-seismic monitoring of cracks in real-time, timely adjustment of fracturing construction parameters.
In addition, the Qinghai Oilfield also conducted horizontal horizontal well + volumetric fracturing tests to help the development of high efficiency in the west of the country. The Shiping 1 well employs horizontal wells + volume fracturing, a total of 8 sections of construction, a total liquid volume of 10,360,000 cubic meters, 621 cubic meters of sand, and the highest daily oil production rate after the implementation of technical means is 395 cubic meters, and the cumulative output exceeds 10,000 tons. At present, Qinghai Oilfield has carried out a volumetric fracturing site test of 28 horizontal wells in the western section of the Yingxi block. Three wells have obtained high-yield industrial oil flow, and the average single well output in the initial stage after fracturing has reached 190 tons.
Qinghai Oilfield stated that a breakthrough has been made in the reconstruction technology of the horizontal well + volume fracturing reservoir in the west of the West, forming a new model of horizontal well + volume fracturing in the West of the block, which further strengthens the oilfield's ability to increase the output of a single well by relying on horizontal well volume fracturing. confidence. (Sun Rui Ji Haijian)
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