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Wrapped profile control degradation agent

A degrading agent and encapsulating technology, applied in drilling compositions, chemical instruments and methods, etc., to achieve the effects of simple process, good anti-corrosion performance and safe construction

Inactive Publication Date: 2014-12-17
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a packaged profile control degradation agent, select a profile control agent degradation system with high safety performance, strong stability, and strong retarding ability, which has reducing substances as the main component of the degradation agent, to replace the current The commonly used enhanced oxidant system can reduce the consumption of degradants due to the weak reduction of the formation, solve the problem of blockage caused by the retention of a large number of cross-linked polymers around the wellbore of profile control and recovery, and restore the wellbore of water injection wells, and restore the normal production of such wells

Method used

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  • Wrapped profile control degradation agent

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Effect test

Embodiment 1

[0022] The components and weight ratio of the packaged profile control degradation agent are: 1% lipophilic surfactant, 0.5% hydrophilic surfactant, 0.01% stabilizer, 0.2% synergist, 5% degradation agent, organic Solvent 60%, inorganic solvent 33.29%.

[0023] During preparation, the stabilizer is added into the inorganic solvent to fully dissolve, then the degradation agent is added into the stabilizer solution to fully dissolve, and then mixed with other components in the formula evenly.

[0024] For the profile control agent used in the field, the above-mentioned prepared degradation agent was used for degradation experiments to investigate the retardation and degradation performance of the packaged profile control degradation agent at formation temperature (60°C). The data are as follows:

[0025] Table 1 Formation temperature (60°C) slow degradation performance of wrapped profile control degradation agent

[0026]

[0027] The packaged profile control degradation agen...

Embodiment 2

[0029] G115-5 is a profile control well in the Ng12 sublayer in the high and shallow northern area. The well started profile control and flooding in April 2007, with a cumulative profile control volume of 12155m 3 . In October 2011, the production was changed, and no liquid was produced after the change. In order to restore the production of the well as soon as possible, the packaged profile control degradation agent 120m was prepared according to the following formula 3 And unwrapped profile control degradation agent 180m 3 . Among them, the packaged profile control degradation agent formula is: 1% lipophilic surfactant; 0.5% hydrophilic surfactant; 0.01% stabilizer; 0.2% synergist; 5% degradation agent; 60% organic solvent; 33.29% inorganic solvent %; Unwrapped profile control degradation agent formula: stabilizer 0.01%; degradation agent 5%. After the degradation is completed, the initial daily liquid production is 14.6m 3 , the yield was stable and the degradation was ...

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Abstract

The invention relates to a wrapped profile control degradation agent, which is composed of the following components by weight: 1% of an oleophylic surfactant, 0.5% of a hydrophilic surfactant, 0.01% of a stabilizer, 0.2% of a synergistic agent, 5% of a degradation agent, 60% of an organic solvent, and 33.29% of an inorganic solvent. The profile control degradation agent is prepared according to the safety performance, stability and retardation principles of profile control degradation agents, and brings the coordinating effect of all substances into fully play. By slow release of the degradation agent, and prolonging of the contact time with a profile control agent and the effective time, the purpose of retardation can be reached. The wrapped profile control degradation agent system has the characteristics of complete degradation of polymers and retardation rate up to 80%. At the same time, being a liquid, the system has the advantages of good deformation performance, no blockage to the reservoir pore throat, no corrosion on tubular columns and good corrosion resistance, and is suitable for removing deep blockage of a oil-water well profile control agent crosslinked polymer. The process is simple, and the construction is safe.

Description

technical field [0001] The present invention relates to a degradant of cross-linked polymer for profile control in oil field, which is packaged to realize the stability and retardation of the profile control degradant, and achieve the purpose of removing blockage of profile control recovery wells and recovering deep profile control agent in water injection wells . Background technique [0002] The medium and shallow reservoirs in Jidong Oilfield have strong heterogeneity, and timely injection of cross-linked polymer for profile control is one of the important means to improve the liquid production profile of the block and improve the effect of water flooding development. Due to the retention of a large amount of profile control agent around the wellbore, the profile control well does not produce liquid after recovery and water injection, which affects the later development and adjustment of the block. At present, the elimination of the influence of profile control agent ret...

Claims

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Application Information

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IPC IPC(8): C09K8/52C09K8/536
CPCC09K8/52C09K8/536
Inventor 徐建华于梦红都芳兰李勇王远征刘京乔煊威王兴
Owner PETROCHINA CO LTD
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