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Perforation fracturing method for longitudinal residual oil dig-down of old well of single-sand body oil reservoir

A single sand body, remaining oil technology, applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc., can solve problems such as affecting fracturing effect and oil drainage area, uncontrollable fracture direction, and insignificant production stimulation effect. , to achieve good production stimulation effect, low cost, and prevent the rise of water cut in oil wells

Inactive Publication Date: 2019-05-21
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, how to effectively produce the remaining oil in the low-permeability section becomes the key to solve the problem of this type of reservoir. The current conventional refracturing can only restore the conductivity of old fractures, and the stimulation effect is not obvious; Evenly arranged, the fractures can only expand in the direction perpendicular to the minimum principal stress of the reservoir, and the fracture direction cannot be controlled. The fracture direction does not expand radially along the wellbore, so it is easy to cause cross communication with old fractures, affecting the fracturing effect and Drain area

Method used

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  • Perforation fracturing method for longitudinal residual oil dig-down of old well of single-sand body oil reservoir
  • Perforation fracturing method for longitudinal residual oil dig-down of old well of single-sand body oil reservoir

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Embodiment

[0058] In July 2016, this technology was tested in Well Wang**. The stress difference between the two phases of the reservoir level was 4.5MPa, and the net pressure required to open natural fractures was 3-5MPa. The lower part of the oil layer was perforated and fractured. Use 0.3% cross-linking liquid + 0.6%-0.8% degradable fiber + rigid temporary plugging agent with multiple particle size difference (2mm, 3mm, 4mm) + 20 / 40 mesh low density selective wettability proppant (1.5g / cm 3 ) composed of fracturing working fluid, after temporarily plugging into new fractures, the surface construction pressure rose from 8.9MPa to 22.0MPa, the pressure increased by 13.1MPa, and the net pressure of bottomhole pressure monitoring increased by 8.0MPa, realizing the opening and filling of natural fractures, expanding Drainage area, DSI pre- and post-pressure monitoring results show that the fracture height is under control, and the lower oil layer of the well has been fully stimulated; the d...

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Abstract

The invention discloses a perforation fracturing method for longitudinal residual oil dig-down of an old well of a single-sand body oil reservoir, which comprises the following steps: perforating a longitudinal oil layer section by utilizing a fixed surface perforation technology, then putting a separate layer fracturing drilling tool, and adopting fracturing working fluid composed of 0.3% of cross-linking liquid, 0.6%-0.8% of degradable fiber, a rigid temporary plugging agent (2mm, 3mm and 4mm) with multiple particle size differences and a 20 / 40-mesh low-density selective wetting proppant (1.5g / cm<3>); fracturing is conducted on the perforation section, injecting fracturing fluid composed of fibers and a multi-particle-size rigid temporary plugging agent, local rapid pressure rise is formed in the near-wellbore zone, the crack net pressure is increased, natural micro cracks are opened, the transformation size is increased, and the purpose of fully using longitudinal remaining oil is achieved; at the later stage of sand adding, a selective wetting agent is added to form a package in a near-wellbore zone, and the water content of an oil well is prevented from rising by utilizing thecharacteristics of oil permeability and water resistance. The technological process is high in operability, low in cost and remarkable in oil field development benefit. The problems that water is prone to being seen in conventional perforation fracturing cracks, longitudinal transformation is not sufficient, and remaining oil is difficult to use effectively are solved.

Description

technical field [0001] The invention relates to the technical field of oil reservoir production stimulation measures for oil and gas field development engineering, and in particular to a perforation and fracturing method for tapping the remaining oil potential of old wells in single sand body reservoirs. Background technique [0002] Some ultra-permeable oil reservoirs in Changqing Oilfield contain more than 60% of the oilfield’s reserves, and the reservoirs are relatively integrated. The initial perforation is mainly in the high-permeability section in the middle and upper parts of the oil layer, with an average vertical perforation degree of 33%. The initial stimulation measures are conventional pressure. After nearly 20 years of exploitation, the controlled crude oil around the main fractures has been basically exhausted. Affected by the vertical heterogeneity of the reservoir, a large amount of remaining oil in the low-permeability section cannot be displaced to the main ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B43/267
Inventor 段鹏辉陆红军卜向前齐银庞鹏达引朋苏良银顾燕凌吴甫让
Owner PETROCHINA CO LTD
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