Combined technology of cluster perforation and stage fracturing

Abstract

The invention discloses a clustered perforating and staged fracturing combined process which comprises the following processes: a, determining the perforated interval clustering according to the requirements of well logging interpretation results and staged fracturing or volume fracturing processes; b, lowering a completion pipe string, lowering a completion tool, and sealing a packer according to the design requirements, and filling with a completion fluid; c, completing the first-stage perforating operation by adopting an under-pressure cable conveying oil passing pipe clustered perforating technology; d, performing fracturing construction; e, after the first-stage fracturing is completed, throwing degradable fiber temporary plugging balls to plug perforating holes, repeating the second-stage clustered perforating and fracturing till the perforating and fracturing construction operation of a whole well is completed. The requirement of ultrahigh-temperature ultrahigh-pressure ultra-deep well one-trip pipe string separated layer fracturing can be met, the high-efficient development of the well is realized, the ultrahigh-temperature ultrahigh-pressure perforating and fracturing completion practice is simplified, the operation ageing is improved greatly, the fracturing operation effect is improved, and the oil and gas production layer protection is beneficial to be improved, and the single well productivity is improved.

Description

technical field [0001] The invention relates to an ultra-high-temperature, ultra-high-pressure clustered perforation and staged fracturing combined process, which belongs to the field of oil and gas field exploration and development. Background technique [0002] Ultra-high temperature and ultra-high pressure perforation technology has entered large-scale commercial application, and has been widely used in Tarim Oilfield and Sichuan Oil and Gas Field. For example, the application of ultra-high temperature, ultra-high pressure and ultra-deep penetration perforation technology in the Piedmont block in the first issue of "Logging Technology" in 2014 published the following contents: A series of problems such as high temperature, ultra-high pressure, wellbore integrity, and string safety. In the early stage of oil and gas well construction, work such as integration and optimization of excitation pressure prediction technology, wellbore dynamic pressure prediction technology, pi...

AI Technical Summary

Problems solved by technology

[0003] Due to the limitation of ultra-high temperature, ultra-high pressure and ultra-deep wells, conventional perforation technology and staged fracturing technology cannot be safely and effectively applied in such wells

Ultra-high temperature and ultra-high pressure ultra-deep oil and gas reservoirs have reservoir characteristics such as well depth of 6000-8500m, well temperature of 150-200℃, and formation pressure of 110-140MPa. Perforation and completion of wells are generally performed with casing. In order to ensure the safety of oil and gas well construction, often in Under the condition of heavy mud, one-time drill pipe transmission perforation operation is performed for all reservoirs, and the wellbore pressure is higher than the formation pressure. This operation method is likely to cause the mud to invade the reservoir after perforation and pollute the reservoir, and the subsequent general reservoir fracturing The stimulation operation cannot form a network of fractures in the reservoir, and the staged fracturing operation cannot be implemented, and the oil and gas production effect cannot meet expectations

[0004] In addition, when this type of well is perforated, the packer is connected to the well and the perforating and testing combined process or the perforating and fracturing process is combined. After the tubing or packer is vibrated, there will be leakage, and the oil and gas well testing time will be low, and even the life of the oil and gas well will not be long

[0005] Conventional cable transmission cluster perforation technology generally uses a digital address integrated circuit selective firing control module for underground cluster selective firing operations. The maximum temperature resistance of this control module is 150°C. If the temperature exceeds this temperature, the address will be lost and communication will not be possible. Phenomenon

[0006] Staged fracturing technology, as the latest means of oil and gas well reservoir stimulation at the present stage, can perform fracturing on the reservoir purposefully, promote the formation of network fractures in the reservoir, better communicate oil and gas fractures, and achieve high production of oil and gas wells , often combined with cluster perforation, it cannot be efficiently implemented in oil and gas wells after drill pipe transmission and perforation, and it is difficult to form network fractures in heavily polluted oil and gas reservoirs

Images