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Slaked lime plugging method in process of exploiting in-situ combustion oil layer

A technology of burning oil formations and mining processes, which is applied in earthwork drilling, sealing/isolation, wellbore/well components, etc. It can solve the problems of high construction cost, difficulty in unblocking, poor selectivity, etc., and achieve low construction cost and easy construction. Controlled, selective effects

Active Publication Date: 2015-12-16
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are still many deficiencies in these existing technologies, mainly including: general plugging, poor selectivity; after plugging, it is difficult to unblock; construction costs are high, etc.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0020] This embodiment provides a slaked lime plugging method in the exploitation process of the incineration oil layer, which includes the following steps: injecting the slaked lime emulsion into the oil production well of the inflamed oil layer to be plugged. Conventional power equipment, such as cement trucks, can be used to inject the slaked lime emulsion into the production well. The slaked lime emulsion is composed of slaked lime with a concentration of 20-150g / L, water glass with a mass concentration of 0.1-0.5% and the remainder of water.

[0021] Wherein, the consumption of the slaked lime in the described slaked lime emulsion adopts following formula to calculate: Q=nFh; In the formula, Q is the consumption of the slaked lime in the described slaked lime emulsion, and the unit is ton; n is injection coefficient, dimensionless, n The value range is: when the gas production of the oil production well is 5000-10000m 3 When / d, n=1; when the gas production of oil produc...

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Abstract

The invention provides a slaked lime plugging method in the process of exploiting an in-situ combustion oil layer. The slaked lime plugging method includes the following steps: injecting slaked lime emulsion into an oil exploitation well of an in-situ combustion oil layer needing to be plugged, wherein consumption Q of slaked lime in the emulsion is equal to nFh, n refers to injection coefficient, and is equal to 1 when gas yield of the oil well is 5000-10000m<3> / d, equal to 1.1 when the gas yield is 10000-20000m<3> / d and equal to 1.2 when the gas yield is greater than 20000m<3> / d, F refers to injection strength of the slaked lime and ranges from 0.1 to 0.2, and h refers to thickness of a gas producing layer of the oil layer needing to be plugged. The slaked lime emulsion can be composed of 20-150g / L of slaked lime, 0.1-0.5wt% of water glass and the balance of water. The slaked lime plugging method has the advantages that construction cost is low, injection liquid is unitary in component and easy to control, and selectivity is high; only the gas producing layer is plugged, and reaction with a non-gas-producing layer is avoided, so that no lime stone is generated; plugging can be released easily.

Description

technical field [0001] The invention relates to a slaked lime plugging method in the exploitation process of burning oil layers, and belongs to the technical field of petroleum exploitation. Background technique [0002] Heavy oil is exploited by burning the oil layer. As the air is injected into the oil layer, it burns with the residual oil in the formation to generate a large amount of tail gas. The liquid volume gradually decreases until the production well only produces gas but no liquid. At this time, the daily gas production of oil production wells reached tens of thousands of cubic meters, which restricted the production capacity of oil wells. It has been determined that CO in the tail gas generated by burning oil layers to exploit heavy oil 2 The content is greater than 16%. [0003] Adjusting the liquid production profile of the production well is an urgent problem to be solved. Existing oil well liquid production profile adjustment and plugging technologies inc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13
Inventor 李鼎一李加庆
Owner PETROCHINA CO LTD
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