Development method for realizing advanced water injection and early water injection by utilizing horizontal well

Abstract

The invention discloses a development method for realizing advanced water injection and early water injection by utilizing a horizontal well. The development method comprises the following steps: S1,selecting a region; S2, selecting the well; S3, determining an integrated injection-production scheme; S4, determining a staged fracturing scheme; S5, dredging and washing the well; S6, testing oil and seeking production; S7, perforating and fracturing a water injection section; S8, scraping and washing the well; S9, feeding an integrated injection-production tool; S10, checking and sealing the integrated injection-production tool; S11, feeding a well completion tubular column to be butted into the well; and S12, injecting water in an annulus and extracting oil by an oil pipe. The developmentmethod has the advantages that injection-production integration can be realized on one well, the water injection investment is reduced, the problems of difficulty in regional water injection and thelike are solved, the capacity can be supplemented for the stratum, the decline rate of the oil well is delayed, the stable production period of the oil well is prolonged, the oil extraction speed andthe final recovery rate of the oil well are improved, the capital recovery period is shortened, the development benefit is improved, and economic 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] In the Yanchang Oilfield located on the Loess Plateau, due to the thousands of ravines in the oil area, there are certain difficulties in the deployment of well locations, coupled with external pressures such as safety and environmental protection in recent years, so 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 ...

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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

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