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Reversible gel consolidation plugging method

A plugging method and gel technology, applied in the field of oil and gas exploration, can solve problems such as lack of application methods, and achieve the effect of ensuring construction effect, improving plugging quality, and ensuring reliability

Pending Publication Date: 2021-12-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in terms of solving the on-site application of gel cement, there is still a lack of a set of better application methods.

Method used

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  • Reversible gel consolidation plugging method
  • Reversible gel consolidation plugging method
  • Reversible gel consolidation plugging method

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Embodiment Construction

[0033] The following description and drawings illustrate specific embodiments of the invention sufficiently to enable those skilled in the art to practice them. The examples merely represent possible variations. Individual components and functions are optional unless explicitly required, and the order of operations may vary. Portions and features of some embodiments may be included in or substituted for those of other embodiments. The scope of embodiments of the present invention includes the full scope of the claims, and all available equivalents of the claims. Herein, various embodiments may be referred to individually or collectively by the term "invention", which is for convenience only and is not intended to automatically limit the scope of this application if in fact more than one invention is disclosed. A single invention or inventive concept. Herein, relational terms such as first and second etc. are used only to distinguish one entity or operation from another with...

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Abstract

The invention discloses a reversible gel consolidation plugging method. The method comprises the following steps: evaluation of the construction feasibility of a plugging material: judging whether the granularity of a consolidation agent meets the requirement or not; in-situ preparation of consolidation slurry: collecting parameters such as well leakage stratum depth, pressure, temperature and water output amount, determining the thickening time of the consolidation slurry, adjusting the adding amount of a retarder according to in-situ water, adding the retarder into a water tank to be evenly stirred, sucking and mixing the consolidation agent and water according to a certain proportion through a batch mixing pump, pumping the mixture into a batch mixing tank, conducting stirring in the batch mixing tank for a certain time, and detecting the performance of the consolidation slurry; the plugging process: preparing the consolidation slurry according to a designed amount, lifting a drilling tool to a certain height above a leakage layer, pumping the prepared consolidation slurry into a well, jacking the consolidation slurry into a stratum by using slurry to jack the drilling tool out, lifting the drilling tool to a safe well section, carrying out intermittent extrusion according to conditions, further enabling a plugging agent to permeate into the leakage layer in a thickening process, closing the well and waiting for setting, opening the well for circulation, and downward putting a drill plug to test the plugging effect.

Description

technical field [0001] The invention relates to the field of oil and gas exploration, in particular to a method for reversible gel consolidation plugging. Background technique [0002] With the development of oil and gas exploration and development, exploration is oriented to deeper formations, and the depth of oil drilling operations is getting deeper and deeper. When drilling into fractures, karst caves, and water-exuding formations, malignant and complex well loss often occurs. In severe cases, the phenomenon of "only entering and not exiting" occurs Or the wellhead does not return the working fluid at all, making it impossible to continue the drilling operation. Leakage plugging is facing great challenges. [0003] The plugging of the Silurian formation in Shunbei Oilfield is facing many technical difficulties, such as deep burial, high temperature, high-pressure water layers in the formation, and many leakage points, which make plugging difficult. Conventional plugging...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/138E21B33/13C09K8/467
CPCE21B33/138E21B33/13C09K8/426C09K8/467
Inventor 易浩赫英状翟科军李双贵罗发强李斐路飞飞张红卫张俊李文霞钟文建杨卫星李少安邹书强
Owner CHINA PETROLEUM & CHEM CORP
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