Method for determining real-time steering fracturing parameters based on composite temporary plugging system

A parametric and systematic technology, applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of high pertinence and effectiveness of difficult fracturing schemes, uniform reconstruction of difficult horizontal well sections, etc.

Active Publication Date: 2020-03-24
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, due to the development of natural fractures of different scales in shale reservoirs and the influence of rock mechanics heterogeneity, it is difficult to achieve uniform stimulation in horizontal well intervals.
At the same time, it is difficult to realize the high pertinence and effectiveness of the fracturing scheme and parameter optimization before fracturing due to the influence of natural fracture prediction model and accuracy, and the reliability of fracturing fracture network prediction.

Method used

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  • Method for determining real-time steering fracturing parameters based on composite temporary plugging system
  • Method for determining real-time steering fracturing parameters based on composite temporary plugging system
  • Method for determining real-time steering fracturing parameters based on composite temporary plugging system

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Embodiment 1

[0040] This embodiment provides a method for determining real-time diversion fracturing parameters based on a composite temporary plugging system. The aim is to increase the complexity of the fracture network in the reconstruction of the horizontal section and achieve uniform reconstruction of the horizontal section. The real-time steering fracturing technology uses a composite temporary plugging system including soluble temporary plugging balls and temporary plugging particles to achieve temporary plugging of perforation holes and fractures of different scales, and at the same time comprehensively analyzes data such as geological parameters, construction pressure, and microseismic real-time monitoring , to form a real-time optimization of the amount, timing and frequency of the composite temporary plugging material, realize uniform reconstruction of the horizontal section, and increase the complexity of the fracturing fracture network. The real-time steering fracturing techno...

Embodiment 2

[0100] As a beneficial and preferred embodiment of the present invention, this embodiment discloses a real-time diversion fracturing technology based on a composite temporary plugging system. The specific implementation steps mainly include two aspects: real-time evaluation of composite temporary plugging effect and real-time optimization technology of temporary plugging parameters.

[0101] (1) Examples of real-time evaluation methods for composite temporary plugging effects mainly include construction pressure evaluation methods and microseismic event coverage evaluation methods.

example

[0103] During the fracturing process of stage i of shale gas well E1 in block W, the construction displacement before and after the temporary plugging agent is put in is Q1m 3 / min, the stable construction pressure before delivery is p t1 MPa, the construction pressure is stable at p after putting in t2 MPa, the temporarily blocked steering pressure is (p t2 -p t1 ) MPa.

[0104] ②Prediction example of the number of effective holes

[0105] Assuming that the perforation shape is a short cylindrical channel, the perforation friction is:

[0106]

[0107] Liquid friction calculation:

[0108]

[0109] Frictional resistance along the clear water △p w The calculation of:

[0110] For turbulent flow, a=(log 10 n+3.93) / 50,b=(1.75-log 10 n) / 7, for Newtonian fluid, n=1. Calculation of friction along the clear water:

[0111] Calculation of the number of effective holes:

[0112] Perform at least two different displacements (q 1 ,q 2 ) in the pumping phase, the li...

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Abstract

The invention discloses a method for determining real-time steering fracturing parameters based on a composite temporary plugging system, and relates to the technical field of unconventional shale oiland gas reservoir reconstruction. The method for determining the real-time steering fracturing parameters comprises the following steps that temporary plugging of perforating holes and fractures of different scales is achieved by using the composite temporary plugging system including a soluble temporary plugging ball and temporary plugging particles, meanwhile, integrating of the data analysis of geological parameters, construction pressure, and micro-seismic real-time monitoring is conducted to form the real-time optimization of the adding amount, adding timing and adding frequency of composite temporary plugging materials, the uniform transformation of the horizontal section is achieved, and the complexity of a fracture network is improved.

Description

technical field [0001] The invention relates to the technical field of unconventional shale oil and gas reservoir stimulation, and more specifically relates to a method for determining real-time steering fracturing parameters based on a composite temporary plugging system. Background technique [0002] The successful commercial development of unconventional shale oil and gas in North America has transformed the world's energy landscape. National shale gas demonstration areas such as Changning-Weiyuan, Zhaotong, and Fuling have been established in China. CNPC has listed Dagang Oilfield, Xinjiang Oilfield, Turpan-Hami Oilfield and Changqing Oilfield as important demonstration areas for shale oil development. The ultra-low porosity and ultra-low permeability of unconventional shale reservoirs, horizontal wells and volume fracturing technologies have boosted the commercial development of such reservoirs. With the advancement of horizontal well drilling technology, the effective...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B49/00G06F30/20
CPCE21B43/26E21B49/00
Inventor 张庆李彦超沈建国何封邓才刘子平杨亚东肖剑锋冯强蒋海
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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