The Research And Application Of Fixed String Fracturing Technology

Currently, Jilin oilfield exploration wells reservoirs are mostly low permeabilityreservoirs, a small layer thickness, a number of layers. Usually require fracturing a wellcontaining two or more of the reservoirs. The method can be used to develop pitching wellslip sleeve-fracturing multilayer casing string, and exploratory wells need to be tested beforeand after fracturing well temperature, draining seeking to develop production methods cannot be used fracturing wells, therefore, need to study a new technology to meet the needs oftest oil exploration well, the original multi-fracturing process, the pressure after thecompletion of the first layer, layer by layer on mentioning fracturing string, and then from thefracturing string, and then down into the drainage requirements production string, not onlylabor-intensive, long construction period, and put on the column during the fracturing fluidcontaminated tubing ejected ground, the ground is not conducive to the environment andhuman health, but also affect the fracturing fluid flowback accurate measurement of theamount.Aiming at these problems and come up with a fixed string multilayer fracturingtechnology, which can be achieved without moving a string of multi-layer fracturing fluidpressure back production requirements, as well as the pressure well temperaturemeasurements, so that the test oil convergence process more closely, thereby shortening thefracturing fluid to the reservoir soaking time, reduce the extent of damage to the reservoir,and shorten the construction cycle (single well fracturing shorten time since fracturing stringand the string under the drain time) to reduce operating costs, reduce labor intensity， toachieve green construction, has a broad application prospects.By improvement and perfection the fracturing equipment, using pitching sleevetechnology to achieve fixed string a multi-segment(four) fracturing, to realize the large use ofultra-low permeability reservoir, in order to improve the single well productivity find aneffective way, while significant shorten the construction period, the success rate ofconstruction has improved significantly, and the scale of investment has also been effectivelycontrolled, Jilin oilfield company in the current geological exploration has always been nobreakthrough, the case of ultra-low permeability reservoir means limited use of largethickness, has a very broad application prospects.