Aimming at the problem of shorter validity period during early flooding stage for low permeability fractured reservoirs in Shuanghe oil block from Zhidan oil field, a technical study and application of multistage compounding flooding was carried out. Based on the profile and flooding mechanism of different slugs, the agents were screened and evaluated indoor. Consumption volume, slug combinations, displacement volume and pressure in flooding scheme were optimized. Field test for SH 69 well proved that using the multi slug compound flooding way of polymer protected slug + high cure system + delayed swelling gel system + delayed crosslinking gel system, the climbing pressure was 2.2 MPa, the start up pressure of injection well was increased with 0.72 MPa effectively, and injectivity index was reduced with 1.9 m3/(d·MPa), which had an obvious effect of controlling water and increasing oil for corresponding wells. The valid period for this type of flooding was up to six months or more, which achieved the integration process of control and flooding, realizing the target of adjusting water injection profile and increasing oil recovery.

layout-grid-mode: both, page-break-after: auto, page-break-before: auto, direction: ltr, text-align: justify, margin: 0pt, text-justify: inter-ideograph, line-height: normal, text-autospace: ideograph-numeric, text-indent: 0pt, mso-pagination: none, mso-outline-level: body-text, mso-hyphenate: auto, mso-layout-grid-align: auto, punctuation-trim: none, punctuation-wrap: hanging, mso-line-break-override: none, mso-vertical-align-alt: auto">font-family: Calibri, font-variant: normal, vertical-align: baseline, text-transform: none, color: windowtext, mso-ascii-font-family: Calibri, mso-fareast-font-family: 宋体">Low permeability fractured reservoirs, Profiling and flooding, Slug, Delayed swelling gel, Delayed crosslinking, Recovery