A development method for realizing advanced water injection and early water injection by using horizontal wells

Abstract

The invention discloses a development method for realizing advanced water injection and early water injection by using a horizontal well, comprising the following steps: S1, selecting an area; S2, selecting a well; S3, determining an integrated-injection-production scheme; S4, determining a staged fracturing scheme; S5. Well flushing; S6. Oil testing for production; S7. Perforation and fracturing in the water injection section; S8. Scraping and flushing; S9. Sending integrated injection-production tools; S10. Seal-checking integrated injection-production tools; The well-forming string is butted to form a well; S12, annulus water injection, tubing oil recovery. The advantages of the present invention are: not only can the integration of injection and production be realized on one well, the water injection investment can be reduced, problems such as regional water injection difficulties can be overcome, but also the capacity of the formation can be replenished, the decline rate of the oil well can be delayed, the stable production period of the oil well can be prolonged, and the oil well can be improved. The oil recovery rate and ultimate recovery rate of oil wells are improved, the capital recovery cycle is shortened, the development efficiency is improved, and economical and efficient development is realized.

Description

technical field [0001] The invention relates to the technical field of horizontal well development in tight oil reservoirs, in particular to a development method for realizing advanced water injection and early water injection by using horizontal wells. Background technique [0002] Yanchang Oilfield is located on the Loess Plateau. Due to the thousands of ravines in the oil area, it is difficult to deploy wells. In addition to external pressures such as safety and environmental protection in recent years, the risk of well site approval has increased year by year. In response to this problem, in order to effectively develop tight oil reservoirs in the later stage, horizontal well development was selected. In order to cope with well site risks, horizontal well development with long horizontal sections was selected. However, it was found during the development process that as the horizontal section increased, the production of horizontal wells The increase is small. At the sam...

AI Technical Summary

Problems solved by technology

[0004] The main design idea of ​​the present invention is to provide a horizontal well staged fracturing integration-injection-production asynchronous development method of a tight oil reservoir, specifically, through staged development of the horizontal section of a horizontal well, one stage of oil production and one stage of water injection are realized. In order to solve the problem of difficult water injection in the area, at the same time, through water injection, the formation energy can be supplemented to increase the recovery rate, so as to realize the efficient development of horizontal wells; Water injection or water injection in the first 450m, and oil production in the last 450m, in other words, divide the horizontal section of a horizontal well into two or three or four sections..., perform one section of water injection, and one section of oil production

Images