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A method for evaluating the connection relationship between oil wells

A technology of connection relationship and evaluation method, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems affecting the normal operation of oilfield production, difficult implementation, high cost, etc., to achieve low cost and wide reservoir range , high accuracy effect

Active Publication Date: 2018-08-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Reservoir connectivity can be measured by methods such as well testing, tracer testing, and reservoir numerical simulation. These methods can reflect the connectivity between wells to a certain extent, but they all have their own limitations. Tracer Testing and well testing methods are difficult to implement on site, will affect the normal operation of oilfield production, and are expensive; numerical simulation methods need to master the static data and dynamic data of the oil layer, and these parameters must be fully prepared and truly in line with the actual conditions of the reservoir. is very difficult

Method used

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  • A method for evaluating the connection relationship between oil wells
  • A method for evaluating the connection relationship between oil wells
  • A method for evaluating the connection relationship between oil wells

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Embodiment 1

[0036] Block F of Shengli Oilfield is a water drive fault block reservoir, with 2 injections and 6 productions, reservoir temperature 63°C, reservoir pressure 10MPa, burial depth 1173m-1230m, porosity 31.5%, recoverable reserves 5.6×10 4 t, the viscosity of crude oil is 1885mPa.s, and the salinity of formation water is 14767mg / L; at present, there is a problem of uncoordinated injection and production in this block, and a production well is going to be transferred to injection, so it is necessary to understand the connection relationship between the six oil wells in this block , implementing the concrete steps of the present invention is:

[0037] (1) On-site sampling

[0038] Sterilized glass bottles with rubber stoppers and screw caps were used to drain 10L of production fluid in the pipeline before taking production fluid samples at the wellheads of the oil wells. The production fluid samples were taken from the wellheads of 6 oil wells, numbered as oil wells 1 to 6, each ...

Embodiment 2

[0051] A block M in Shengli Oilfield is located on the high point of the fault zone in the sag of a complex fault reservoir. 5 t, the formation water salinity is 12560mg / L. There are 6 oil wells in this block, of which No. 3 oil well is located in the west of the fault zone, and the other 5 oil wells are located in the east of the fault zone. The current geological analysis data of this block shows that the fault zone is not connected. The specific implementation steps of implementing the present invention are:

[0052] (1) On-site sampling

[0053] Use sterilized glass bottles with rubber stoppers and screw caps. Before taking production fluid samples at the wellheads of the oil wells, 20L of production fluids in the pipeline should be emptied. The production fluid samples were taken from the wellheads of 6 oil wells, numbered as oil wells 1 to 6, each The sampling volume of the well is 30L, and the production fluid will be taken to the sample and sealed at 4°C, and will be p...

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Abstract

The invention discloses a method for evaluating the connection relation between oil wells, and belongs to the technical field of oil-gas field development. The method is characterized by comprising the following steps: field sampling; sample pretreatment; DNA extraction and polymerase chain reaction (PCR); high-throughput sequencing and community structure analysis; clustering analysis; oil well connectivity judgment. The judgment results are as follows: (1) if the judged clustering distance is 0-5, the oil well connectivity is good; (2) if the judged clustering distance is 5-10, the oil well connectivity is general; (3) if the judged clustering distance is 10-20, the oil well connectivity is poor; (4) if the judged clustering distance is 20-25, the oil wells are not connected. The method is high in accuracy and wide in oil deposit application range; through adoption of the method, the connection relation between the oil wells can be accurately judged, so as to provide real-time oil deposit connectivity information for oil injection transfer; the cost is low, the method is simple, addition of any reagent to an oil deposit is not needed, and normal production of the oil wells is not impacted; environmental pollution and the follow-up water treatment problem are avoided. Therefore, the method can be widely applied to judgment of the connection relation between the oil wells.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field development, and in particular relates to an evaluation method for the connection relationship between oil wells. Background technique [0002] In oilfield development, reservoir connectivity is an important content of reservoir description, and also the basis of oilfield development and management plans. Knowing the connectivity between oil wells is very important for studying the spatial distribution of reservoirs, accurately calculating the reserves of oil and gas reservoirs, and formulating reasonable development plans. Adjustment schemes are of great significance; the main body of complex fault-block oilfields is fault-block oil reservoirs, and fault-block oil reservoirs controlled by fault cutting have different fault combinations and reservoir geometries. The opening degree of the outside world is obviously different. Understanding the connection relationship between oil wells in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 吴晓玲汪卫东胡婧宋欣孙刚正王静徐闯徐鹏谭晓明巴燕段传慧曹嫣镔
Owner CHINA PETROLEUM & CHEM CORP
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