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A self-supporting acid fracturing method for a double-slit system

A self-supporting, acid fracturing technology used in earth-moving drilling, wellbore/well components, production fluids, etc. to slow down the decline

Active Publication Date: 2021-08-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This document is the first domestic document introducing self-supporting acid fracturing technology, but it only conducted indoor experiments, and did not involve how to realize rock self-supporting on site.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0081] Well X is a horizontal development well with a vertical depth of 7487m and an oblique depth of 8558m. The well drilled is in the Jianfang Formation of the Ordovician. The lithology is yellow-gray micritic limestone and sandy micritic limestone, and local fractures are well developed. , the reservoir pressure coefficient is 1.173, and the temperature gradient is 2.11°C / 100m. It is a normal temperature and pressure reservoir. It is estimated that the temperature of the middle depth (7487.11m) of the reservoir is 157.99°C, and the reservoir pressure is 85.8MPa. The well is completed with open hole, and the construction technology is open hole packer + sliding sleeve staged acid fracturing.

[0082] According to the physical properties of the well reservoir and the development of fractures, in order to fully explore the productivity of the well, the method provided by the present invention is used for acid fracturing. The specific implementation steps and effects are as foll...

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PUM

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Abstract

The invention discloses a self-supporting acid fracturing method of a double-slit system. Including: construction of main fractures with high-viscosity fracturing fluid; construction of ultra-low-density proppant with low-viscosity fracturing fluid; construction of branch fractures with low-viscosity fracturing fluid; construction of main fractures and branch fractures with high-viscosity fracturing fluid; variable viscosity Acid fluid variable displacement viscous finger acid fracturing construction. The present invention adopts the combined injection of fracturing fluids and acid fluids with different viscosities to form self-supporting rocks in the main fractures, improve the flow conductivity of the fractures, and further form self-supporting branch fractures on the basis of the self-supporting rocks in the main fractures , improve the diversion capacity of branch fractures, make full use of branch fractures, and expand the volume of fracture reconstruction. The output and validity period after acid fracturing are greatly improved, so as to realize the economical and effective development of carbonate reservoirs.

Description

technical field [0001] The invention relates to the technical field of carbonate reservoir transformation, and furthermore, relates to a self-supporting acid fracturing method of a double-slit system. Background technique [0002] At present, conventional acid fracturing technology is mainly used in carbonate reservoirs. The process injection mode mainly adopts pre-fluid acid fracturing, multi-stage alternating injection and acidification of closed fractures, etc. The liquid mainly uses conventional hydrochloric acid or earth acid, gelling acid, emulsified acid and surface cross-linked acid, etc., the above-mentioned acid fracturing process and fluids have played a vital role in the stimulation of carbonate rock reservoirs, but the length of acid-etched fractures formed, low conductivity and rapid decline become constraints The problem of high-efficiency development of carbonate rocks, especially when the vertical depth of carbonate rock reservoirs reaches more than 5000m, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/27E21B43/267
Inventor 蒋廷学吴春方曾义金刘建坤刘红磊周林波侯磊吴峙颖
Owner CHINA PETROLEUM & CHEM CORP