Method for evaluating connection relation 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 such as affecting the normal operation of oilfield production, difficult implementation, high cost, etc., achieving low cost and wide reservoir range. , the effect of high accuracy

Active Publication Date: 2016-01-20
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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  • Claims
  • Application Information

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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

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  • Method for evaluating connection relation between oil wells
  • Method for evaluating connection relation between oil wells
  • Method for evaluating connection relation between oil wells

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Embodiment 1

[0036] Block F of Shengli Oilfield is a waterflooded fault block reservoir, with 2 injections and 6 production, reservoir temperature of 63℃, reservoir pressure of 10MPa, burial depth of 1173m-1230m, porosity of 31.5%, and recoverable reserves of 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 incoordination between injection and production in this block, and a production well is about to be transferred. Therefore, it is necessary to understand the connection between the 6 oil wells in this block , The specific steps for implementing the present invention are:

[0037] (1) On-site sampling

[0038] Using sterile glass bottles with rubber stoppers and screw caps, vent 10L of produced fluid in the pipeline before taking produced fluid samples at the wellhead of the oil well, and take produced fluid samples from 6 wellheads, numbered oil wells 1 to 6, each The sampling volume of the well is 20L, a...

Embodiment 2

[0051] A block M in Shengli Oilfield is located at the high point of the fracture zone in the sag of a complex fractured reservoir. The reservoir temperature is 75℃, the reservoir pressure is 11.2MPa, the porosity is 33.5%, and the recoverable reserves are 7.3×10. 5 t, the salinity of formation water 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 for implementing the present invention are:

[0052] (1) On-site sampling

[0053] Using sterile glass bottles with rubber stoppers and screw caps, vent 20L of produced fluid in the pipeline before taking produced fluid samples at the wellhead of the oil well. Take produced fluid samples from 6 wellheads, numbered oil wells 1 to 6, each The sampling volume of the well is 30L,...

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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 a method for evaluating the connection relationship between oil wells. Background technique [0002] In oilfield development, reservoir connectivity is an important content of reservoir description, and it is also the basis of oilfield development and management plans. Understanding the connectivity of oil wells is important for studying the spatial distribution of reservoirs, accurately calculating reservoir reserves, and compiling reasonable development. The adjustment plan has very important significance; the main body of the complex fault block oil field is the fault block oil reservoir. The fault block oil reservoir controlled by the fault cutting is different due to the different combination of faults and the different reservoir geometry. The opening degree of the outside world is obviously different. Understanding the connection relationship be...

Claims

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Application Information

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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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