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Karst cave type oil reservoir oil well nitrogen injection oil extraction method and system

A technology of karst cave type and oil well, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc. It can solve the problems of complex oil-water relationship, complex connection relationship of storage space, and no unified oil-water interface, etc., to improve the replacement efficiency , Improve the effect of single well productivity

Active Publication Date: 2019-07-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

③The oil-water relationship is complex. Due to the strong heterogeneity of reservoir distribution, the connection relationship of reservoir space is extremely complicated. In addition, the reservoir is formed by multi-stage charging, and there are various oil-water distribution patterns, and there is no unified oil-water contact
Due to certain errors in earthquake prediction and well drilling, oil wells cannot be accurately drilled to the top of the cave

Method used

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  • Karst cave type oil reservoir oil well nitrogen injection oil extraction method and system
  • Karst cave type oil reservoir oil well nitrogen injection oil extraction method and system
  • Karst cave type oil reservoir oil well nitrogen injection oil extraction method and system

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Embodiment approach

[0028] In addition, the determination of the cave-type oil wells to be produced needs to be determined according to the type of specified attributes. That is to say, if the types of specified attributes collected are different, the determined wells to be produced in cave-type oil reservoirs will be different. In this embodiment of the present application, in combination with the types of the above-mentioned three specified attributes, the following three implementations are given to determine the karst-cavern reservoir oil well to be produced according to the specified attribute of the karst-vug reservoir oil well, specifically as follows:

[0029] The first implementation mode: when the specified attributes include: seismic body anomalies within the first preset range from the oil well and drilling vent bottom loss, there will be seismic volume anomalies within the first preset range from the oil well and drilling vent bottom loss The oil well is determined to be the oil well ...

Embodiment 1

[0060] Well 1# in Tahe Oilfield is located in a structural remnant hill, with local structural highs around the well, and large-scale reservoirs developed, with crude oil geological reserves reaching 62×104m3. The acid fracturing cave was put into production in May 1999, and the initial daily crude oil production was 500t. However, with the development, the oil-water interface moved up, which made it difficult to recover the remaining oil in the high part above the overflow outlet around the well. In May 2011, the oil well flooded violently, with a high water cut of 99.9%. From April 11th to 22nd, 2012, 55×104Nm3 nitrogen gas was injected. On April 24th, the 3mm choke nozzle was opened for evaluation. From production to January 2013, the water cut was again high, and the cumulative oil increase was 1658t.

Embodiment 2

[0062] Well 2# in Tahe Oilfield is located in a structural remnant hill, 20m away from the top layer of the Ordovician system, and was drilled and vented. Large-scale reservoirs were developed, and the crude oil geological reserves reached 58×104m3. The conventional well was completed and put into production in June 2006, and the initial daily crude oil production was 120t. However, with the development, the oil-water interface moved up, making it difficult to recover the remaining oil in the high part above the overflow outlet around the well. In May 2013, the oil well was flooded violently, with a high water cut of 98%. From June 10th to 20th, 2013, 80×104Nm3 nitrogen gas was injected. On June 22nd, the 6mm choke nozzle was opened for evaluation. From production to August 2013, the water cut was again high, and the cumulative oil increase was 1870t.

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Abstract

The invention discloses a karst cave type oil reservoir oil well nitrogen injection oil extraction method and system. The method comprises the steps of collecting the specified attribute of a karst cave type oil reservoir oil well, determining a karst cave type oil reservoir oil well to be subjected to oil extraction according to the specified attribute of the karst cave type oil reservoir oil well, injecting nitrogen into the karst cave type oil reservoir oil well to be subjected to oil extraction, and exploiting the karst cave type oil reservoir oil well to be subjected to nitrogen injection. Through the method, by injecting pure nitrogen, the replacement efficiency is improved, the gas occupies the crude oil space, and the oil-water interface moves downwards, so that the single well productivity is improved after the karst cave type oil reservoir oil well is flooded.

Description

technical field [0001] The invention relates to the technical field of oil reservoir development, in particular to a method and system for injecting nitrogen into an oil well of a karst cave type oil reservoir. Background technique [0002] At present, the Tarim Basin is an important oil and gas basin in my country, in which the reserves of karst-vug oil reservoirs are abundant, and the karst-vug oil reservoirs have six major characteristics: ①Reservoir pores, fractures, and caves are developed, and karst caves are the main reservoir space; The matrix porosity of the reservoir is less than 1%, and the reservoir space is dominated by dissolved vugs, dissolved pores and fractures. It is often considered that fractures and dissolved pores mainly play a connecting role, and dissolved caves are the main reservoir space, accounting for 71% of the reserves. ②The heterogeneity is extremely strong, and the spatial combination and connectivity of reservoirs are diverse. Due to the diff...

Claims

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Application Information

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IPC IPC(8): E21B43/16
CPCE21B43/168
Inventor 刘中云赵海洋胡文革丁保东任波王建海李亮何龙焦保雷吴文明李军杨利萍冯一波赵毅曾文广
Owner CHINA PETROLEUM & CHEM CORP
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