Oil well low differential pressure addition sand prevention process method

Abstract

The invention provides anoil well low differential pressure addition sand prevention process method. The method includes the following steps of step 1 preparingwellholes, lifting original well tubularcolumns, conductingexploratory sand, pigging, scraping tubes, and performingpressure tests on oil tubes and casings; step 2, pretreating stratum, after the tubular columns are put in, openingaoil tubevalve to control spray, conducting nitrogen foam flowback, conducting exploratory sand, and washing wells; step 3, performing gravel filling sand prevention construction; step 4, performing sand filter tube hanging sand prevention construction; step 5, performing anti-adsorbent agent squeezing construction. The methodcan reduce the additional resistance of a gravel filling layer and a wellhole sand blocking layer of the well near the oil reservoir oil well of water flooding, polymer flooding and the polymer flooding converting into the subsequent water flooding, and is the most effective sandprevention process for loosing extract production of the oil well in the middle and later periods of sandstone oil reservoirs.

Description

technical field [0001] The invention relates to the technical field of oil field development, in particular to a low additional pressure difference sand control process for oil wells. Background technique [0002] Unconsolidated sandstone reservoirs are one of the key points in the development of Shengli Oilfield. The reservoirs of this kind of reservoirs are loosely cemented and prone to sand production during the development process. Gravel packing and sand control are one of the main measures to ensure the normal development of such reservoirs. Conventional gravel packing is not compact for sand control. The mixing of formation sand and packing sand reduces the conductivity of the packing layer, and the additional pressure difference is large. After the well is opened, the oil well fluid volume drops rapidly, which restricts the economical and efficient development of unconsolidated sandstone reservoirs. For this reason, we have invented a new oil well low additional pres...

AI Technical Summary

Problems solved by technology

Conventional gravel packing is not compact for sand control, the mixing of formation sand and packing sand reduces the conductivity of the packing layer, the additional pressure difference is large, and the oil well fluid volume drops rapidly after the well is opened, which restricts the economical and efficient development of unconsolidated sandstone reservoirs

Images