In-depth profile control channeling sealing agent and preparation method and application method thereof

A technology of deep profile control and plugging agent, applied in chemical instruments and methods, drilling composition and other directions, can solve the problems of insufficient plugging strength, scattered residual oil distribution, small plugging radius, etc., and achieve high temperature plugging. The effect of high rate, good pumping performance, good temperature resistance

Active Publication Date: 2021-09-28
PETROCHINA CO LTD
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Steam flooding and steam huff and puff are effective development methods for heavy oil reservoirs. With the continuous development of steam flooding and steam huff and puff, the recovery degree of the main part is high, the distribution of remaining oil is scattered, it is difficult to tap the potential, and the effect of steam flooding at the edge is poor. Large channels have been formed between injection and production wells, making it difficult to improve the effect
Aiming at the problem of uneven vertical and horizontal production during the development process, solid-phase high-temperature profile control technology has been implemented in recent years, which has achieved a certain oil increase effect, but the effective period of profile control is short, and this technology can only be implemented in general steam injection wells , cannot solve the problem of uneven production of separate injection wells, so it is urgent to implement solid-free steam drive profile control technology to ensure construction safety
[0003] Affected by factors such as reservoir heterogeneity and steam overlay, large pores between injection and production wells are obvious after long-term steam flooding, and the problem of uneven production of reservoirs has become increasingly prominent. Profile control agents need to enter deep formations to block steam channeling channels. The profile control agent has good anti-shear performance in the deep formation. At the same time, the high-temperature area of ​​steam driving is 240-260°C. In the past, the temperature resistance of the organic particle gel was unstable, and the plugging strength was not enough. At the same time, the plugging radius was small and the validity period was short; The profile control effect is better in increasing and stabilizing the pressure, but the oil increasing effect is average and the validity period is short. Therefore, the idea of ​​simple plugging and increasing the steam injection pressure for profile control can no longer meet the needs of steam drive profile control, and deep profile control must be adopted. The idea of ​​profile control combined with profile and enhanced plugging to improve the effect of measures

Method used

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  • In-depth profile control channeling sealing agent and preparation method and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] This embodiment provides a deep profile modification and sealing agent, which is prepared by the following steps:

[0032] Step 1, taking the total weight of the deep profile control sealing agent as 100%, weighing 9% potassium humate, 0.16% polyanionic cellulose (viscosity greater than 50mPa·s), 1.5% urotropine, 0.14% phenol, 0.04% sodium tripolyphosphate, 0.025% β-cyclodextrin and 0.06% thiourea, the balance is water with a salinity of 4500mg / L.

[0033] Step 2, mix the weighed potassium humate, polyanionic cellulose, urotropine and water in a liquid mixing tank, and stir at room temperature for 20 minutes to obtain the mixture.

[0034] Step 3: Add weighed phenol, sodium tripolyphosphate, β-cyclodextrin and thiourea to the mixture in sequence, and stir at room temperature for 12 minutes to obtain a deep profile-modifying sealing agent.

Embodiment 2

[0059] This embodiment provides a deep profile modification and sealing agent, which is prepared by the following steps:

[0060] Step 1, taking the total weight of the deep profile control sealing agent as 100%, weigh 10% potassium humate, 0.2% polyanionic cellulose (viscosity greater than 50mPa·s), 1.8% urotropine, 0.16% phenol , 0.045% sodium tripolyphosphate, 0.04% β-cyclodextrin and 0.08% thiourea, and the balance is water with a salinity of 3860mg / L.

[0061] Step 2: Mix the weighed potassium humate, polyanionic cellulose, urotropine and water in a liquid mixing tank in sequence, and stir at room temperature for 30 minutes to obtain the mixture.

[0062] Step 3: Add weighed phenol, sodium tripolyphosphate, β-cyclodextrin and thiourea to the mixture in sequence, and stir at room temperature for 15 minutes to obtain a deep profile-modifying sealing agent.

Embodiment 3

[0086]This example provides the application of the deep profile control and channeling agent in profile control and channeling sealing of heavy oil steam flooding injection wells. Take the steam injection well Q20 in Liaohe Oilfield as an example. The well absorbs steam unevenly in the vertical direction, and there are high-permeability channels and large pores in the plane, and the production effect of the corresponding well group becomes poor. In order to effectively control the adverse effects of steam channeling, the deep profile control and sealing channeling agent prepared in Example 2 was used to implement profile control and channeling sealing measures to improve the production effect.

[0087] The specific construction process is as follows: under the condition of formation temperature of 240℃, the 550m 3 The deep profile control and channeling agent is sequentially injected into the formation through a 5-slug injection process.

[0088] After the measures were take...

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Abstract

The invention provides an in-depth profile control channeling sealing agent and a preparation method and an application method thereof. The in-depth profile control channeling sealing agent is prepared from the following raw materials: potassium humate and/or sodium humate, polyanionic cellulose, urotropine, phenol, sodium tripolyphosphate, beta-cyclodextrine and/or a beta-cyclodextrine derivative, thiourea and/or a thiourea derivative and water. The invention also provides an application method of the in-depth profile control channeling sealing agent in a steam-drive oil reservoir channeling sealing measure, the method comprises the step of injecting the deep profile control channeling sealing agent into a stratum with the temperature of 80-290 DEG C, wherein the injection amount is more than 500m < 3 >. The in-depth profile control channeling sealing agent has good pumping performance and temperature resistance, long gelling time and high high-temperature plugging rate, and has an obvious oil increasing effect when being applied to profile control channeling sealing construction.

Description

technical field [0001] The invention relates to the technical field of oil recovery, in particular to a deep profile control and channeling agent, a preparation method and an application method thereof. Background technique [0002] Steam flooding and steam huff and puff are effective development methods for heavy oil reservoirs. With the continuous development of steam flooding and steam huff and puff, the recovery degree of the main part is high, the distribution of remaining oil is scattered, it is difficult to tap the potential, and the effect of steam flooding at the edge is poor. A large channel has been formed between injection and production wells, and it is difficult to improve the effect. Aiming at the problem of uneven vertical and horizontal production during the development process, solid-phase high-temperature profile control technology has been implemented in recent years, which has achieved a certain oil increase effect, but the effective period of profile co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/508
CPCC09K8/508
Inventor 刘强孙守国王浩张俊李瑞马昌明赵剑飞蒋硕安峰仲超张恒嘉肖冬冬管紫君杨帆
Owner PETROCHINA CO LTD
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