Profile control-unplugging combining technique for water injection well

A process method and technology for water injection wells, which are applied in chemical instruments and methods, earth-moving drilling and production, wellbore/well components, etc. To meet production needs and other issues, to achieve the effect of plugging high-permeability layers, improving water injection efficiency, and reducing construction times

Active Publication Date: 2018-01-12
CHINA NAT OFFSHORE OIL CORP +2
View PDF5 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the perspective of the development of profile control and acidizing plugging removal, simple acidizing and profile control of water wells cannot simultaneously increase injection of water wells and reduce interlayer conflicts
For heterogeneous reservoirs, when the distribution fails to meet the requirements, acidification and plugging removal measures are taken. After the acid solution is injected into the reservoir, most of it will be consumed in the high-permeability layer, and less acid will enter the low-permeability layer, which will eventually deepen the reservoir. layer heterogeneity contradiction
Due to the low water injection sweep efficiency due ...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Profile control-unplugging combining technique for water injection well
  • Profile control-unplugging combining technique for water injection well
  • Profile control-unplugging combining technique for water injection well

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Using the reservoir core of Bohai BZ34-1 oilfield as the experimental material, a double core flow experimental device was used for indoor experimental simulation. The experimental procedure is shown in figure 2 .

[0059] First select two cores with different permeability: 1# (565md) and 2# (89md), put the two cores into the core holder, then connect the experimental pipeline and configure the experimental samples. The temperature of the Bohai Sea reservoir is simulated by the experiment at 65°C.

[0060] Experimental process: The first step is to obtain the pressure test curve through the experiment. The displacement pressure difference starts from 0.2mPa and increases by 0.1mPa. The simulated formation water is injected into the double core flow device, and the flow velocity of the formation water when the two cores flow stably under different pressures is recorded. The pressure test curve of the displacement process is drawn according to the experimental data, th...

Embodiment 2

[0074] The reservoir cores of Bohai PL19-3 oilfield were used as experimental materials, and the double core flow experimental device was used for indoor experimental simulation. The experimental procedure is shown in figure 2 .

[0075] First select two cores with different permeability: 3# (862md) and 4# (226md), put the two cores into the core holder, then connect the experimental pipeline and configure the experimental samples. The temperature of the Bohai Sea reservoir is simulated by the experiment at 65°C.

[0076] Experimental process: The first step is to obtain the pressure test curve through the experiment. The displacement pressure difference starts from 0.1mPa and increases by 0.1mPa. Simulated formation water is injected into the double core flow device, and the flow rate of the formation water when the two cores flow stably under different pressures is recorded. The pressure test curve of the displacement process is drawn according to the experimental data, t...

Embodiment 3

[0090] Using the reservoir core of Bohai BZ34-1 oilfield as the experimental material, a double core flow experimental device was used for indoor experimental simulation. The experimental procedure is shown in figure 2 .

[0091] First select two cores with different permeability: 5# (356md) and 6# (287md), put the two cores into the core holder, then connect the experimental pipeline and configure the experimental samples. The temperature of the Bohai Sea reservoir is simulated by the experiment at 65°C.

[0092] Experimental process: The first step is to obtain the pressure test curve through the experiment. The displacement pressure difference starts from 0.2mPa and increases by 0.1mPa. The simulated formation water is injected into the double core flow device, and the flow velocity of the formation water when the two cores flow stably under different pressures is recorded. The pressure test curve of the displacement process is drawn according to the experimental data, t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a profile control-unplugging combining technique for a water injection well. The profile control-unplugging combining technique comprises the steps that (1), well input fluid is prepared; (2), pressure is gradually increased, water is injected into a stratum, a relation curve of injection pressure and displacement is drawn, and an injection pressure curve knee P* is determined; (3), a cellulose plugging agent A is injected at the injection pressure smaller than P* and used for remote well profile control; (4), a profile control agent B forming glue through acid catalysis is injected at the injection pressure smaller than P*; (5), displacement fluid is injected; (6), well shutting for waiting on cement setting is carried out for 2-6 hours; (7), acid liquor C is injected at the injection pressure larger than P*; (8), pressure release is carried out; (9), normal water injection is restored, and if normal water injection can be achieved, construction is completed. According to the profile control-unplugging combining technique for the water injection well, water reducing oil increase of a high water content oil well is achieved, profile control and unplugging ofthe multilayer oil deposit water injection well are achieved, an injection profile is improved, and the oilfield development effect is improved; and construction operation of the water injection wellis easy, convenient, safe and efficient, and wide market application prospects are achieved.

Description

technical field [0001] The invention relates to profile control technology and acidizing technology of water injection wells in the oil development process, in particular to a combined adjustment-dissolution process for water injection wells in heterogeneous reservoirs. Background technique [0002] For nearly a century since water injection development was put forward, water injection has been the mainstream oil production method in oilfields all over the world. A reservoir often consists of multiple oil layers. Due to the difference in permeability of each oil layer, the injected water will rush along the high-permeability layer, resulting in premature water flooding of the oil well. Therefore, in the process of water injection development, the high-permeability layer of the reservoir has a strong water absorption capacity, and fingering and tongue-ingress phenomena appear to form water flow channels. The injected water circulates ineffectively, and the low-permeability la...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): E21B33/13E21B43/20E21B43/22C09K8/508C09K8/74
Inventor 刘长龙赵立强刘义刚杜娟孟祥海邹剑刘平礼李年银罗志锋兰夕堂符扬洋高尚张璐张诚成李文鑫
Owner CHINA NAT OFFSHORE OIL CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap