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Highly-deviated well fracturing method

A highly deviated well and fracturing technology, which is applied in earthwork drilling, wellbore/well components, special data processing applications, etc., can solve problems such as the difficulty of developing thick oil reservoirs, and increase the complexity of fracturing, The effect of enhancing the tendency of lateral expansion and reducing the risk of water breakthrough

Active Publication Date: 2020-12-01
PETROCHINA CO LTD
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Problems solved by technology

[0005] Aiming at the problem in the prior art that the development of thick reservoirs with multiple thin layers and interlayers is difficult to develop, the present invention provides a fracturing optimization method for highly deviated wells, which can improve the degree of reserves production and increase the rate of oil recovery

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Embodiment 1

[0054] refer to Figure 4 , using a highly deviated well fracturing optimization method provided by the present invention, a total of 12 wells were tested in the test area, and the production stimulation effect was remarkable. The 6 wells in the X area have an average daily oil production of 4.2t / d and a water cut of 28.4% at the initial stage of production, and the 10 wells in the Y area have an average daily oil production of 6.3t / d and a water cut of 30.1%. Increase 3t / d to the well. Among them, the high-inclination well A carried out the test of differential sand injection pumping method. The first stage used high viscosity liquid to create the main fracture, the middle slick water with low sand ratio added sand, and the later stage filled the main fracture with high viscosity and high sand ratio. Sand-adding mode; the second stage adopts conventional pumping mode. The downhole microseismic test results show that the effective support fracture length and fracture stimula...

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Abstract

The invention discloses a highly-deviated well fracturing optimization method. According to the highly-deviated well fracturing optimization method disclosed by the invention, fracturing parameter optimized design considering the adaptability of cracks and a well network is conducted, and different crack distribution modes of side wells and corner wells are built, so that the water breakthrough risk is reduced; secondly, by utilizing an oil reservoir numerical simulation method, inter-crack interference is considered to optimize the reasonable crack interval, the lateral expansion tendency ofthe cracks is enhanced, the fracturing complexity degree is increased, and then the crack transformation size is increased; and in addition, a differentiated sand-adding pumping method is adopted to realize long crack and short crack combined design, a crack matching method corresponding to injection and production of highly-deviated wells is improved, the longitudinal utilization degree of reserves and the oil production speed and yield of a single well are increased, and a new direction is opened up for development of ultra-low permeability III-type and compact oil reservoirs.

Description

technical field [0001] The invention relates to the field of oil production engineering, in particular to a fracturing method for highly deviated wells. Background technique [0002] In recent years, with the deepening of development, the proportion of low permeability, ultra-low permeability and ultra-low permeability Type I and II has decreased year by year, and the proportion of ultra-low permeability Type III and tight oil has increased year by year. Low-grade reserves have become the main target of production and construction . In the vertical direction of the reservoir, the oil layers change from monolithic continuous superimposed thick sand type to multi-interlayer thick sand type, single-layer medium-thick sand type and multi-thin interbed type; It is more difficult to increase production and reduce costs through layer transformation. [0003] At present, horizontal well drilling and staged fracturing have become an effective way to increase single well production ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B43/267E21B43/30G06F30/20
CPCE21B43/26E21B43/267E21B43/305G06F30/20
Inventor 殷桂琴慕立俊唐梅荣陈文斌王建麾王蓓闫永萍鲁玲邓咸安
Owner PETROCHINA CO LTD
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