A method of oil production using coiled tubing to inject air into horizontal wells

A technology of coiled tubing and horizontal wells, which is applied in the field of air flooding oil production in oilfields, can solve the problems of unbalanced swept volume, difficulty in controlling the direction of gas, and low utilization rate of the horizontal section, and achieve balanced swept volume in the horizontal section, easy control of the direction of gas, The effect of improving formation connectivity

Active Publication Date: 2019-01-18
中嵘能源科技集团有限公司
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AI Technical Summary

Problems solved by technology

[0004] Traditional air flooding is all vertical well gas injection. Due to low formation permeability, poor connectivity, and heterogeneity, the gas distribution after air injection into the formation is uneven, and it is difficult to control the direction of the gas, which has a great impact on the air flooding effect. The utilization rate of the horizontal section is low, the affected volume is unbalanced, and at the same time, it may cause blockage of the horizontal section and cause gas backflow

Method used

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  • A method of oil production using coiled tubing to inject air into horizontal wells

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Experimental program
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Effect test

Embodiment 1

[0032] The oil recovery method of injecting air into a horizontal well by coiled tubing comprises the following steps:

[0033] 1. Determine the distribution of oil reservoirs in the formation, including the location of dead oil areas, areas that are difficult to reach during normal displacement, etc., and determine the specific location of crude oil that is difficult to produce in the horizontal section.

[0034] 2. After completion of high-pressure gas injection, coiled tubing is used to carry out segmental perforation at the position dismantled in step 1. The coiled tubing can be extended and retracted downhole to carry out supplementary perforation in different isolation sections, and the continuous drilling can be adjusted as needed. The running depth of pipe and perforating gun.

[0035] 3. After step 2 is completed, the gas injection part of the coiled tubing is lowered into the position to be injected. Firstly, the carbon dioxide injection system is used to inject 0.15...

Embodiment 2

[0039] Compared with Example 1, the difference is that in step 3, the injection amount of carbon dioxide is 0.18PV, followed by injection of 0.14PV, 135°C hot water; in step 4, 0.12PV of high-concentration oxygen-enriched oxygen is injected with an oxygen content of 65%.

Embodiment 3

[0041] Compared with Example 1, the difference is that in step 3, the injection amount of carbon dioxide is 0.13PV, followed by injection of 0.12PV, 165°C hot water; in step 4, 0.18PV of high-concentration oxygen-enriched oxygen is injected with an oxygen content of 55%.

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Abstract

An oil production method adopting coiled tubing to inject air to a horizontal well is characterized by comprising the following steps of carrying out segmental perforation on the coiled tubing in the horizontal well; sequentially injecting carbon dioxide and hot water at 130-170 DEG C, and then establishing temperature field; injecting high-density enriched oxygen which comprises, by mass percentage, 40-70% of oxygen, and enabling the enriched oxygen to set off a rapid cracking reaction with crude oil so as to release large amount of heat to increase temperature of an oil layer for completing ignition work; and injecting air, and urging the crude oil to continue the cracking reaction by the oxygen part in the air, forming pressure difference, and pushing the crude oil to flow to a producing well and be produced. A recovery rate is greatly improved, the injected carbon dioxide plays a role of protective gas, and safety accidents are reduced.

Description

technical field [0001] The invention relates to an oil production method for injecting air into a horizontal well by using a coiled tube, which belongs to the oil field air flooding oil production technology. Background technique [0002] Coiled tubing originated during the Second World War and began to be used in petroleum technology in the 1960s. After more than 50 years of development, it has been widely used in oil field drilling and oil production in various countries around the world. Coiled tubing has the characteristics of small diameter, good flexibility, no joints, no leakage, corrosion resistance, high safety factor, low cost, high efficiency, etc. that many conventional strings do not have. [0003] Coiled tubing drilling and oil production is a new type of drilling and oil production technology that has been widely used in the world in recent years. It has different materials, operating techniques and equipment from conventional drill pipes and tubing, and has i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/16E21B43/247
CPCE21B43/168E21B43/247
Inventor 邓晓亮洪兆王明暄洪雷
Owner 中嵘能源科技集团有限公司
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