Method for calculating staged fracturing productivity of compact reservoir horizontal well

A staged fracturing and productivity calculation technology, applied in the field of petroleum fracturing, can solve the problems of unsatisfactory application effect, harsh assumption conditions, and few studies on rapid optimization of fracturing parameters

Active Publication Date: 2016-08-10
RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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Problems solved by technology

[0004] The studies of the above scholars play an important role in the productivity evaluation and dynamic prediction of horizontal wells, but there are mainly the following problems: (1) most of the current productivity calculation models have relatively harsh assumptions, and the factors affecting productivity are not fully considered, and the application effect is not good. It is too ideal; (2) Regarding the parameter optimization methods of staged fracturing horizontal wells, m...

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  • Method for calculating staged fracturing productivity of compact reservoir horizontal well
  • Method for calculating staged fracturing productivity of compact reservoir horizontal well
  • Method for calculating staged fracturing productivity of compact reservoir horizontal well

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Embodiment Construction

[0083] The assumptions for establishing the mathematical model are as follows:

[0084] (1) The driving type of the reservoir is hydraulic elastic flooding, that is, the supply edge pressure remains unchanged;

[0085] (2) The flow of fluid in the reservoir matrix is ​​isothermal and stable seepage, regardless of the effects of gravity and capillary force;

[0086] (3) The fluid in reservoirs and fractures is single-phase flow;

[0087] (4) Rectangular vertical fractures completely penetrate the pay zone;

[0088] (5) The fluid first flows into the fracture uniformly along the fracture wall, and then flows into the horizontal wellbore from the fracture.

[0089] Among them, 1) The calculation model of the far-field nonlinear seepage part is:

[0090] The core flow test experiment was carried out with a high-precision flowmeter, and the relationship curve between permeability and displacement pressure gradient was obtained, see figure 2 , to establish the equation of state...

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Abstract

The invention relates to the technical field of oil fracturing, in particular to a method for calculating the staged fracturing productivity of a compact reservoir horizontal well. The method is characterized by including the steps of firstly, dividing a reservoir infiltration area into four parts; secondly, obtaining the equivalent hole diameter of each fracture; thirdly, obtaining the yield of each fracture during multiple fracture disturbance; fourthly, coupling the yield of each fracture with the hydraulic pressure drop flow model in a horizontal wellbore to obtain a group of bottom hole pressure, iteratively solving until the bottom hole pressure difference of the previous step and the next step is smaller than tolerance, namely convergence, and taking the determined group of yield as the fracture-control yield of each fracture and the sum of the fracture-control yield of the fractures as the total yield of the horizontal well. The method is real and reliable in calculation result and good in application effect.

Description

technical field [0001] The invention relates to the technical field of petroleum fracturing, in particular to a method for calculating the production capacity of staged fracturing of horizontal wells in tight oil reservoirs. Background technique [0002] The productivity of horizontal wells is the basis for the optimization of fracturing parameters and the evaluation of development effects of horizontal wells. At present, domestic and foreign calculations on the fracturing productivity of horizontal wells are mostly based on the Darcy seepage model in the reservoir matrix. However, mine production practice and laboratory test results show that the matrix seepage of ultra-low permeability reservoirs does not conform to the classic Darcy's law. There is a strong nonlinear seepage phenomenon. [0003] A series of studies have been carried out at home and abroad on the fracturing productivity calculation of horizontal wells. Deng Yinger et al. established a two-phase non-Darcy ...

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Application Information

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IPC IPC(8): E21B49/00G06F19/00
CPCE21B49/00G16Z99/00
Inventor 石立华赵习森高海龙席天德严茹波党海龙刘滨薛颖白远田丰龚娟丁磊柳朝阳李刚
Owner RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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