Oil field block overall profile adjusting device and adjusting method

An adjustment method and technology for adjusting devices, which are applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc., can solve the problems of high safety risk, many measures, and long well occupation time, and achieve the effect of less corrosiveness.

Active Publication Date: 2019-12-10
PETROCHINA CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

At present, there are many methods to adjust the water absorption profile, mainly including acidizing plugging removal, water plugging and profile control, and temporary plugging and acidizing. At the same time, the above-mentioned technology not only requires a lot of measures, but also requires a dynamic water injection string, which causes problems such as long occupation time and high safety risks.

Method used

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  • Oil field block overall profile adjusting device and adjusting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] refer to figure 1 , taking a certain block of Jiyuan Oilfield as an example, due to the influence of reservoir heterogeneity and fracture development, the water absorption status of some wells gradually deteriorated, and the proportion of wells with uneven water absorption increased year by year, accounting for nearly 50% at present. Contradictions gradually became prominent, the form of water absorption became worse, and the contradictions in development were gradually exposed. In order to improve the development effect of this block, it is planned to carry out the overall profile adjustment operation of 31 water injection wells with uneven water absorption in this block, and remove the plugging wells in the stratum. Dispensing volume. The diversion acidizing well is mainly determined by observing the water absorption profile, the water injection volume and water absorption degree of different layers. Among them, 15 wells are used for acidizing and plugging removal o...

Embodiment 2

[0058] For the 16 injection wells that require diversion acidification, to figure 1 Take the second water injection well 7 as an example. Under normal water injection conditions, the first dosing device 2 (also called plugging removal equipment) of the water injection station and the second dosing device 5 (also called temporary plugging equipment) of the well site are required. ). First open the second check valve 10 and the sixth check valve 14 to allow the diversion agent to enter the hypertonic zone of the second water injection well 7; 15 parts of surfactant, 10 parts of dispersant and 40 parts of organic solvent. When the amount of diverting agent is , close the second check valve 10 and the sixth check valve 14, and then open the first check valve 9 and the fifth check valve 13, so that the neutral plug-removing agent and the flow-diverting agent can merge to form a blocking barrier, so that the following The neutral plugging removal agent turns to enter the low per...

Embodiment 3

[0062] The situation and steps of this embodiment are the same as those of Embodiment 2, except that the specific components of all neutral plug-removing agents and diverting agents are different.

[0063] Wherein, the diverting agent entering the hypertonic zone of the second water injection well 7 includes 35 parts of thermosetting resin, 7.5 parts of polyol, 12.5 parts of surfactant, 7.5 parts of dispersant and 35 parts of organic solvent in parts by weight.

[0064] When the hypertonic zone is clogged, the first check valve 9 and the fifth check valve 13 are first opened to allow the neutral plugging agent to enter the hypertonic zone. The neutral plugging agent used at this time consists of the following parts by weight: Material composition: 35 parts of biological enzyme, 7.5 parts of suspending agent, 7 parts of oxidizing agent, 12.5 parts of corrosion inhibitor, 7.5 parts of penetrating agent, 25 parts of chelating agent and 7.5 parts of surfactant.

[0065] Wherein, b...

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Abstract

The invention discloses an oil field block overall profile adjusting device and adjusting method. A first chemical charging device 2 of a water injection station is mainly used for charging a blockagerelieving agent to a well site. A second chemical charging device on an oil production well site is used for charging a diverting agent. The oil field block overall profile adjusting device realizesoverall profile adjusting on water injection wells, requiring profile adjusting, administrated by the whole water injection station from original single-well profile adjusting operation changed to block overall profile adjusting operation, the construction efficiency is greatly improved, the construction cost is saved, the construction process is simplified, and the construction time is shortened.The oil field block overall profile adjusting device and adjusting method have the important significance on block water injection well profile adjustment.

Description

technical field [0001] The invention belongs to the technical field of oil field injection water development, and in particular relates to a method for adjusting the water absorption profile of a water injection well in a low-permeability oil reservoir, and more particularly to a device and method for adjusting the overall profile of an oil field block. Background technique [0002] Water injection is an effective means to replenish formation energy and ensure long-term stable production of oilfields. However, during the water injection development process, with the extension of water injection development, due to the phenomenon of fingering and the difference in its own permeability, the water absorption of water injection wells is uneven, and the distribution of water flooding is uneven. Lateral oil wells are not effective, main oil wells have high water cut, and development contradictions are gradually exposed. [0003] Therefore, in order to improve the effect of water f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/20E21B43/22
CPCE21B43/16E21B43/20
Inventor 邓志颖姚建国陆小兵王勇宋昭杰王尔珍胡改星何汝贤
Owner PETROCHINA CO LTD
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