The Optimum Design Of Massive Fracturing Treatment Plan For Block Shen 95 Of Liaohe Oil Field

The Block Shen 95 of Liaohe Oilfield field is located at the north part of Jinganbao structural belt of Damingtun sag, covering the oil-bearing area of 10. 3km2, OOIP of 1364. OXIO't. The oil reservoir depth is 1800. 0~2230. Om. The lithology of the block is mainly medium coarse sandstone and fine sandstone. The porosity is 18.0%, the permeability is 59. 7X 10"'u m2 and the oil is high pour point crude oil. The reservoir began to be developed in 1998. The formation pressure declined rapidly leading to the fast decline of oil production. At present, the oil production rate is just at 0. 18% and the production level is at 6.65%.The production rate and the production level are all very low in the Block because of the low permeability and the low formation energy of the reservoir. The massive fracturing treatment for entire Block combined with the programs of water injection and fracturing and the production are the effective measures for developing this kind of reservoir.The thesis is based on the purposes of improvement of total productivity of theBlock to do the following researches in terms of the massive fracturing treatment, that is to study the feasibility of the oil and water wells for fracturing treatment under the water injection on the basis of establishment of numerical model of reservoir with artificial fractures, to study the effects of fracture parameters such as the artificial fracture length and the conductivity of the injection & production wells on the production index based on the artificial fracture orientation adjustment and optimized injection & production pattern, and finally decide the reasonable parameters and the plan design of the massive fracturing treatment.Meanwhile, the matching technique researches also have been made on the proppant, low temperature fracturing fluid, clean fracturing fluid, encapsulated breaker, fracturing/gas lift/production pipe string. The pretest has been made in the field and the fracturing treatment is 10 well/times with accumulative oil increase of 40572. 8t. The ratio of the output to the input is 1:2.1 achieving the better stimulation results.Liaohe Oil field has entered into the medium-late development period, there are many medium and low permeability blocks similar to Block 95 of Shen such as the formation of Dujiatai of Huanbei and Shasan formation of Xingbei. The formation energy of them declines rapidly after many years development leading to the dramatic decrease of the production. The research results of this thesis will not only play an important role in the development of the Block 95 of Shen, but also have an important guidance to the other similar blocks of Liaohe Oilfield.