Study On Multi - Layer And Multi - Stage Fracturing Technology In Qinghai Oilfield

On the basis multi-layer, multi-stage fracturing technology pilot test, studied and optimized the multi-layer, multi-stage fracturing process further, carried out cracks extending law longitudinally, fracture parameters, the construction scale and construction parameters, production forecasting and economic evaluation and other studies, in the Nanyishan and Seven Springs areas formed the different plan which is the different strata fracturing program and in a few layers in vertical wells, explicit different pressure section, a small layer composition, construction scale and construction parameters, provides basis for the promotion of multi-layer vertical well fracturing technology; for Dongping area well production is low, combined with the geological results of the study, carried out Dongping area horizontal wells, vertical well fracturing process selection, fracture parameters, the construction scale, construction parameter optimization, the fracturing fluid is also preferred that the formulation optimization, formed the horizontal wells,vertical wells multi-layer,multi-stage fracturing technology in Dongping area.Focus on the promotion of horizontal wells hydraulic jetting staged fracturing technology and vertical wells K344packer scale sleeve fracturing process, a total of75wells to promote the application in263layers, the success of measure is95.29%, a single well46.38m3sand is added, average single segment with liquid133.53m3, single segment with sand13.38m3, the average proppant concentration is22.26%, the maximum partial pressure is nine segments in one construction; the measures of effective rate is94.67%, after measures the average single-well oil increased3.60tons, the average single layer increased oil1.21tons, as of the end of2013, after the measures the average single well produced174days, achieved good results.In the promotion of hydraulic cracking and K344packer scale sleeve multi-layer, multi-stage fracturing technology also launched the naked well packer and coiled tubing annulus hydraulic jetting sand added fracturing technology pilot test.Through the promotion and application of new technology and multi-layer,multi-stage fracturing technology pilot test in oil wells, reached a partial pressure of nine segments technical objectives, enhanced the level of Qinghai Oilfield fracturing technology provided technical support to the increase of low permeability reservoir to "bid" project in the Qaidam Basin.