Micro-fracturing augmented injection process method suitable for water injection well of offshore oil field

A technology for offshore oil fields and process methods, which is applied in earth-moving drilling, wellbore/well components, and production fluids, etc., can solve the problems of short validity period and high acidification cost, achieve obvious effects, save material costs, restore and improve water injection capacity Effect

Inactive Publication Date: 2019-09-06
SOUTHWEST PETROLEUM UNIV +1
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  • Abstract
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  • Application Information

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Problems solved by technology

Aiming at the severe situation of repeated acidification with short validity period and high acidification cost, a te

Method used

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  • Micro-fracturing augmented injection process method suitable for water injection well of offshore oil field
  • Micro-fracturing augmented injection process method suitable for water injection well of offshore oil field
  • Micro-fracturing augmented injection process method suitable for water injection well of offshore oil field

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Embodiment

[0038] The present invention takes CNOOC (China) Co., Ltd. Bonan Offshore Oilfield X well as an embodiment, and the concrete steps are as follows:

[0039] Such as figure 1 As shown, combined with the analysis of the current situation of oilfield production, it is determined that well X is micro-fractured, and the limit injection displacement is determined as Q according to the reservoir conditions, wellbore structure, formation fracture pressure and engineering conditions. max =0.5m 3 / min, wellhead pressure limit 30MPa.

[0040] Such as figure 2 As shown, change the working system of the water injection well (the water injection speed is required to be much lower than the limit injection displacement so as not to break the formation) to obtain the relationship between the water injection pressure and the water injection speed (displacement), and calculate the water absorption index.

[0041] Such as image 3 As shown, the water injection rate (displacement) is increased...

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Abstract

The invention belongs to the technical field of oil exploration, development and augmented injection, and particularly relates to a micro-fracturing augmented injection process method suitable for a water injection well of an offshore oil field. The micro-fracturing augmented injection process method comprises the following steps: S1, based on the limit displacement, a procedure for testing a pre-pressure water absorption index is established, the pre-pressure water absorption index of the water injection well is calculated, and a pre-pressure water absorption indicative curve of the water injection well is drawn; S2, according to the water absorption index and the limit displacement, fracturing working fluid is injected into a target formation through a step-type progressive increase pump, and a fracturing construction curve graph is drawn; S3, according to the fracturing construction curve graph, micro-fracturing breaking points are judged, and after the breaking points occur, the pump is stopped; and S4, a post-pressure water absorption index of the water injection well is tested, and a post-pressure water absorption indicative curve of the water injection well is drawn and compared with the pre-pressure water absorption indicative curve of the water injection well to evaluate the micro-fracturing effect of the water injection well. The micro-fracturing augmented injection process method has the beneficial effects that the material cost of acidification deblocking and the cost of fresh water transportation are saved, important significance for low-cost efficient augmented injection of the offshore water well is achieved, and the effect of relieving a near-well damage belt is obvious.

Description

technical field [0001] The invention relates to a micro-fracturing injection enhancement process suitable for water injection wells in offshore oil fields, and belongs to the technical field of petroleum exploration and development injection enhancement. 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. 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 requirement of "enough water injection" for oilfield development. Aiming at the serious situation of repeated acidification with short validity period and high acidification cost, a technical method of "micro-fracturing to remove plugging and increase injection" for water i...

Claims

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Application Information

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IPC IPC(8): E21B43/26
CPCE21B43/26
Inventor 胡永全杨寨刘常清张宁赵立强孙海涛吴斌
Owner SOUTHWEST PETROLEUM UNIV
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