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Method for judging full profile control degree of water injection well

A discrimination method and technology for water injection wells, applied in the direction of earthwork drilling, borehole/well components, production fluid, etc., can solve the problem of inability to accurately judge the adequacy of profile control, the inability to satisfy the judgment of the adequacy of profile control of water wells, and the inability of water absorption profiles of water wells. Uniformity and other issues

Inactive Publication Date: 2013-09-11
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] (1) The FD range (0.65-0.95) of the fullness FD method for judging the adequacy of profile control is too wide to accurately judge the adequacy of profile control;
[0008] (2) The FD method cannot satisfy the judgment of the adequacy of profile control for all water wells, especially for wells whose FD is higher than 0.65 before profile control, but the water absorption profile of the well is not uniform, and still needs to be judged for the adequacy of profile control
[0009] (3) Empirical methods have serious uncertainties and are too subjective

Method used

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  • Method for judging full profile control degree of water injection well
  • Method for judging full profile control degree of water injection well
  • Method for judging full profile control degree of water injection well

Examples

Experimental program
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Embodiment 1

[0054] Taking the profile control of Well LN209 in Lunnan Oilfield as an example, it will be described in detail.

[0055] Well LN209 is a water injection well in the TI oil group in the structure 2 well area of ​​Lunnan Oilfield. The geological reserves of the TI oil reservoir are 12.36 million tons, with an average porosity of 17% and an average permeability of 227mD. The well has accumulated 778,500 cubic meters of water injection before profile control,

[0056] The well drilled 5 sublayers with a total of 11.9m of oil layer for water injection. The water absorption profile before profile control in July 2010 showed that the main water absorption interval of the well was 4732.0-4737.5m, with a thickness of 5.5m. The relative water absorption was 74.98%, and the absolute water absorption The volume is 242.92m 3 / d, the water absorption profile is extremely uneven.

[0057] With the method of the present invention and the measured data before and after the profile control,...

Embodiment 2

[0060] Taking the Guan 60-46 profile control well group in Dagang Oilfield as an example, it will be described in detail.

[0061] The well group is located in the east of the Wang 102-1 fault block, with geological reserves of 360,000 tons, recoverable reserves of 91,000 tons, and remaining recoverable reserves of 60,600 tons; the average porosity is 22.1%, and the average permeability is 186.4mD. Before profile control, the accumulative fluid production of the well group was 37,600 cubic meters, the cumulative water injection was 37,000 cubic meters, and the cumulative injection-production ratio was 0.98. A total of 12 sublayers were drilled in the well, and a total of 59.1m oil layers were injected for general water injection. Before profile control, the water absorption profile showed two high water absorption layers, and their relative water absorptions were 54.28% and 23.52%, respectively, and the rest of the sublayers absorbed little or no water. , The water absorption ...

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Abstract

The invention discloses a method for judging the full profile control degree of a water injection well. The method particularly comprises the steps: (1) according to data of a water injection profile of the water injection well, perforation data, full permeability data of small layer holes, and the like, computing the theoretical range PI0min-PI0max of a pressure index value after the full profile control is achieved, (2) computing the theoretical fullness degree range FD0min-FDOmax of the water injection well when the full profile control is achieved through a fullness degree formula, (3) computing a measured pressure index PI1 of the water injection well after the profile control according to a measured falloff curve of a well opening of the water injection well, (4) confirming the actual fullness degree FD1 of the water injection well after the profile control, and (5) judging whether the profile control is full or not according to analysis on the actual fullness degree FD1 after the profile control and the theoretical fullness degree range of the full profile control. The method can accurately and rapidly judge whether the profile control of the water injection well is full or not, the profile control of the water injection well is scientifically instructed, the effect of water injection development is improved, and the oil recovery rate of crude oil is improved.

Description

Technical field [0001] The invention relates to a water injection well profile control technology for water injection development oilfields, in particular to a method for efficiently and accurately judging the sufficient degree of water well profile control. technical background [0002] Water flooding is the most widely used method in oilfields to maintain formation energy and enhance oil recovery. However, affected by factors such as reservoir heterogeneity and unfavorable oil-water mobility ratio, the oilfield will inevitably enter a medium-high water-cut period, or even an ultra-high water-cut period with the prolongation of water injection development time. How to control water output, stabilize or increase oil well production is a problem that must be solved in the middle and late stages of oilfield water injection development. [0003] Profile control technology is an important technology for stabilizing oil and controlling water after water injection development oil...

Claims

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Application Information

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IPC IPC(8): E21B43/20
Inventor 金发扬蒲万芬孙琳李科星赵田红
Owner SOUTHWEST PETROLEUM UNIV
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