Method for micro-acid pressure composite augmented injection in offshore high-porosity and high-permeability reservoir

A reservoir, slightly acid technology, applied in drilling compositions, chemical instruments and methods, and earthwork drilling, etc., can solve the problems of reservoir matrix collapse and sand production, improve porosity and permeability, restore and the effect of improving water injection capacity

Inactive Publication Date: 2019-09-24
SOUTHWEST PETROLEUM UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is suitable for water injection wells in offshore high-porosity and high-permeability sandstone reservoirs. If conventional acid fracturing technology is used for such wells, it is easy to cause problems such as reservoir matrix collapse and sand production.

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  • Method for micro-acid pressure composite augmented injection in offshore high-porosity and high-permeability reservoir
  • Method for micro-acid pressure composite augmented injection in offshore high-porosity and high-permeability reservoir
  • Method for micro-acid pressure composite augmented injection in offshore high-porosity and high-permeability reservoir

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Embodiment Construction

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings, so that those skilled in the art can implement it with reference to the description.

[0026] It should be understood that terms such as "having", "comprising" and "including" as used herein do not entail the presence or addition of one or more other elements or combinations thereof.

[0027] Applying the method of slightly acid fracturing composite augmentation injection of the present invention to the BZ-X well of Bonan Oilfield, the specific operation steps are as follows:

[0028] Step 1. Measures Screening of water injection wells

[0029] BZ-X is a directional water injection well in the 1D well area of ​​the west block of Bozhong BZ Oilfield. The completed drilling depth is 2394.00m, the vertical depth is 1788.34m, the maximum well deviation is 49.76°, the vertical depth in the middle of the perforation is 1615.6m, and the vertical thickness of the perf...

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Abstract

The invention discloses a method for micro-acid pressure composite augmented injection in an offshore high-porosity and high-permeability reservoir. The method comprises the following steps that S1, a target well suitable for micro-acid pressure composite unplugging and augmented injection is screened out; S2; liquid mediums are injected into the target well to break a near-well formation to form micro-cracks and keep the cracks open; S3, an acid liquid system is injected as prepad fluid or subsequent fluid to dissolve and remove inorganic scales in a near-well zone; S4, acidic treatment liquid is injected into the opened cracks for corrosion; and S5, a water absorption index or an daily water injection amount is used for evaluating the effect of the augmented injection; and if organic blockage occurs in the target well, the operation of removing the organic blockage is further included before the step S3, specifically, organic washing liquid is injected into the target well to dissolve and remove the organic scales at shaft bottom and the near-well organic matter damage. The method integrates the technologies such as micro-fracturing cracks, organic solvent cleaning and acid etching crack reforming, realizes the augmented injection of a water injection well in an offshore oil field, and meets the requirement of ''enough injection of water'' in the oil field development and water injection process.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a method suitable for micro-acid fracturing compound plugging removal and increasing injection in offshore high-porosity and high-permeability reservoirs. Background technique [0002] The water injection process in offshore oilfields will cause damage to the reservoir due to various reasons, and acidification and plugging removal measures can relieve the damage to a certain extent and restore the water injection capacity. At present, conventional acidizing technology (without forming micro-fractures), organic solvent cleaning technology to remove organic matter damage, and large-scale acid fracturing technology are widely used in offshore and continental sandstone reservoirs. However, the effective period of acidizing plugging removal decreases with the increase of repeated acidizing times, and more frequent plugging removal operations are required to meet the req...

Claims

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Application Information

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IPC IPC(8): E21B43/27E21B43/26E21B37/06C09K8/528C09K8/74
CPCC09K8/528C09K8/74E21B37/06E21B43/26
Inventor 胡永全杨寨刘常清张宁赵立强阮新芳马亮
Owner SOUTHWEST PETROLEUM UNIV
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