A Calculation Method of Dynamic Comprehensive Fluid Loss Coefficient of Acid Fracture in Fractured Reservoir

A calculation method and fluid loss technology, applied in complex mathematical operations, earthwork drilling, wellbore/well components, etc., can solve problems that cannot well meet the needs of dynamic fluid loss coefficient calculations, etc.

Active Publication Date: 2020-05-01
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

Therefore, these methods cannot well meet the needs of dynamic fluid loss coefficient calculation in fractured reservoirs during acid fracturing.

Method used

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  • A Calculation Method of Dynamic Comprehensive Fluid Loss Coefficient of Acid Fracture in Fractured Reservoir
  • A Calculation Method of Dynamic Comprehensive Fluid Loss Coefficient of Acid Fracture in Fractured Reservoir
  • A Calculation Method of Dynamic Comprehensive Fluid Loss Coefficient of Acid Fracture in Fractured Reservoir

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Embodiment

[0123] Assuming that there are two natural fractures on the fracture wall, the input parameters are shown in Table 1.

[0124] Table 1 Reservoir physical property data, fluid parameter data and wellbore structure data of this well

[0125] parameter value parameter value Fluid pressure in acid fracturing fracture, 10 6 Pa

70 Initial width of the first natural fracture, m 0.00012 Formation fluid pressure, 10 6 Pa

60 Height of the first natural fracture, m 13 Rock porosity, % 8 Initial width of the second natural fracture, m 0.00018 rock permeability, 10 -15 m 2

1 Height of the second natural fracture, m 19 Formation fluid compressibility, 10 6 Pa -1

5×10 -5

Acid-rock reaction constant, m / s 1.5×10 -5

Formation fluid viscosity, Pa·s 0.001 Dissolving ability of acid liquid to rock, kg / kg 1.37 Crack area on one wing and one side, m 2

3000 h + Diffusion coefficient, m 2 / s

...

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Abstract

The invention discloses a calculation method for dynamic comprehensive filtration coefficient of fracturing acidizing in fractured reservoir. The calculation method for dynamic comprehensive filtration coefficient of fracturing acidizing in fractured reservoir comprises the following steps that: (1) calculating a matrix filtration coefficient Cmt of the considering acid wormhole; (2) calculating the natural fracture filtration coefficient (Cft0) (i) i ( / i) in initial state and the comprehensive filtration coefficient Ct0 of the fracturing acidizing in initial state; (3) calculating the effective operating distance (Lefn) (i) i ( / i) of the acid liquor in the i natural fracture of a Tn time step; (4) calculating the i natural fracture width (wn) (i) i ( / i) of the Tn time step; (5) calculating the filtration coefficient (Cftn) (i) i ( / i) of the i natural fracture of the Tn time step; (6) calculating the comprehensive filtration coefficient Ctn of the fracturing acidizing of the Tn time step. The calculation method for dynamic comprehensive filtration coefficient of fracturing acidizing in fractured reservoir considers the natural fracture width variation caused by the acidliquor corrosion on the wall surface of the natural fracture, the principle is reliable, the calculation is simple, the natural fracture with random and complicated distribution can be processed, thefiltration speed of the acid liquor in the fracturing acidizing process can be accurately and quickly calculated, thereby providing an effective guidance for the design of the fracturing acidizing scheme.

Description

technical field [0001] The invention relates to the field of petroleum and natural gas exploration and development, in particular to a calculation method for acid fracturing dynamic comprehensive fluid loss coefficient of fractured reservoirs in the field of acid fracturing. Background technique [0002] Fractured oil and gas reservoirs are rich in reserves and are the focus of oil and gas exploration and development. Acid fracturing is one of the important means of such reservoir stimulation. Acid fracturing is the use of surface high-pressure pumps to pump acid liquid into the formation at a displacement higher than the absorption capacity of the reservoir to generate hydraulic fractures. At the same time, the acid solution reacts with the fracture wall rock to non-uniformly etch the fracture wall rock to form groove-shaped or uneven etched fractures. After the construction, the fractures are not completely closed, and artificial fractures with a certain geometric size a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/26G06F17/18
CPCE21B43/26G06F17/18
Inventor 郭建春任冀川刘彧轩王世彬李枚
Owner SOUTHWEST PETROLEUM UNIV
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