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Branch well bay wall solidifying liquid and preparation method thereof

A technology of solidified fluid and branched wells, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as easy instability of the wellbore, poor compaction diagenesis, loss of branched wellbore effects, etc., to achieve Guaranteed stability, high compressive strength, and the effect of safe construction

Active Publication Date: 2013-11-13
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, in the development process of unconsolidated sandstone heavy oil reservoirs, due to the poor compaction and diagenesis of unconsolidated sandstone buried shallowly, the reservoir cementation is loose. Easy to lose stability, causing the entire branch borehole to be buried, losing the function of the branch borehole

Method used

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  • Branch well bay wall solidifying liquid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1, preparation solidification liquid

[0030] (1) Preparation of modified epoxy furan resin

[0031] Pre-dissolve epoxy furan resin with a mixed solvent composed of n-butanol and ethylene glycol butyl ether (mass ratio 1:1), ensure that it is placed in a four-neck flask equipped with a stirrer, constant pressure funnel, condenser tube and nitrogen conduit , raised the temperature to 105°C, added 1 / 2 of the total amount of BPO (benzoyl peroxide) in acetone solution (the mass concentration of BPO was 10%), and reacted for 30 minutes; AMPS (2-acrylamido-2-methyl Propanesulfonic acid) was dissolved in water, slowly added dropwise into the four-necked bottle within 1 hour, and kept warm for 30 minutes, during which time, the remaining BPO solution was added twice, and the reaction was continued for 1.0 hour. After the reaction, a light yellow transparent viscous solution is obtained, which is the AMPS modified epoxy furan resin solution, and the modified epoxy fu...

Embodiment 2

[0035] Embodiment 2, preparation solidification liquid

[0036] (1) Preparation of modified epoxy furan resin

[0037] The preparation method of the modified epoxy furan resin is the same as step (1) in Example 1.

[0038] (2) Preparation of solidified liquid

[0039] Get 10 grams of above-mentioned modified epoxy furan resins prepared and add in the beaker, take by weighing 15 grams of laurylamine and add in the beaker and mix with the modified epoxy furan resins, add 75g mass concentration in the mixed product under stirring condition. 30% sodium chloride aqueous solution, stirred at 2000 rpm for 10 minutes, is the solidified solution.

[0040] The "sand filling injection method" was used to evaluate the solidified liquid system in the example.

[0041] (1) The viscosity of the solidified liquid in Example 1 was investigated as a function of temperature and time. The results showed that the solidified liquid prepared in Example 1 had a long-term stability at room temperat...

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Abstract

The invention discloses a branch well bay wall solidifying liquid and a preparation method thereof. The solidifying liquid provided by the invention is composed of the following components in parts by mass: 10-20 parts of modified epoxy furan resin, 15-30 parts of organic amine hardener and 50-75 parts of diluent; and the modified epoxy furan resin is prepared by using the method comprising the following step of carrying out solution polymerization on 2-acrylamido-2-methylpropanesulfonic acid in an epoxy furan resin solution under the initiating action of an initiator. The branch well bay wall solidifying liquid has the beneficial effects that the viscosity of a solidifying liquid system disclosed by the invention is lower than 30mPa.s, so that the solidifying liquid system is conveniently injected to the stratum in the construction process; the solidifying liquid system can be injected to the stratum by using a single liquid process and has a certain construction adaptation time so that the safe underground construction can be ensured; and a solidification body prepared by injecting the solidifying liquid system to a sand filled tube has high compressive strength up to over 10MPa, so that the stability of a branch well bay wall can be ensured.

Description

technical field [0001] The invention relates to a solidification liquid for interlayer walls of branch wells and a preparation method thereof, belonging to the field of oil field chemical applications. Background technique [0002] At present, in the development process of unconsolidated sandstone heavy oil reservoirs, due to the poor compaction and diagenesis of unconsolidated sandstone buried shallowly, the reservoir cementation is loose. It is easy to lose stability, causing the entire branch wellbore to be buried and lose the function of the branch wellbore. In order to ensure the maximum oil drainage area, completion methods such as casing cementing and mechanical support are rarely used in the development of branch wells to solve the above problems. It seems very necessary. [0003] Chemical sand consolidation technology is to use chemical agents to cement the sand and gravel in the loose sandstone formation or the sand filled in the formation, stabilize the formatio...

Claims

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Application Information

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IPC IPC(8): C09K8/508
Inventor 何保生林科雄李玉光向兴金武广瑷舒福昌陈欢杨纯祥
Owner CHINA NAT OFFSHORE OIL CORP