New technology for recovering production and increasing production of shut down wells in pgz oilfield

A new technology and oilfield technology, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problem of increased dosage of water plugging and profile control agent, difficulty in water plugging and profile control, and premature dehydration of polymer gel And other issues

CN103967466BInactive Publication Date: 2016-03-09SHAANXI KANGLIN PETROLEUM TECH DEV CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2016-03-09
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a PGZ oil field abandoned well exploitation recovery and production increasing novel technique, aims to improve crude oil recovery exploitation degree and greatly improve well yield and change abandoned dead oil field with high water content into living oil field capable of producing oil base on operation and construction treatment. According to the PGZ oil field abandoned well exploitation recovery and production increasing novel technique, a slowly expanding selective water plugging technique and a slowly expanding selective water plugging fixing technique with high plugging intensity, good stability, long effective period and no perpetual harm to stratum are adopted and a critical novel technique enabling fluid to steering flow is introduced. The dominant mechanism of the fluid steering flow technique is that water in high pressure water layer leaks into matrix oil layer at the presence of a steering agent and crude oil in the matrix oil layer is driven to flow to a shaft bottom under flow pressure difference, so as to be exploited.
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Description

technical field

[0001] The invention belongs to the technique of increasing oil recovery in oil field exploitation, in particular adopting a profile control and plugging technique utilizing novel slow-swelling particles, microscopic flow direction changing agent and slow-swelling fixed changing agent. Background technique

[0002] In order to further improve the recovery rate of water flooding in the water cut period, since the 1950s, people have adopted profile control and water shutoff technologies such as adjusting the water absorption profile and redirecting fluid in deep oil layers. The research on the corresponding profile control and water shutoff reagents and their systems has also attracted the attention of many petroleum workers and researchers. In view of the actual situation that many oil wells in most oilfields are shut down due to excessive water flooding, and the remaining underground oil cannot be recovered, efforts to develop a plugging agent with excellent ...

Examples

Embodiment Construction

[0072] The technical solution of the present invention will be further described in detail through on-site examples below.

[0073] Well Wa 2658-4 began to produce water in October 2009, and the water content of the produced liquid reached 100%. The well was shut down in December 2011 to stop production. It is understood that during the period from October 2009 to December 2011, different units carried out two different oil increase measures on Well Wa 2658-4, but none of them achieved the effect of oil increase. During this period, the well produced fluid The moisture content is 100%. Shaanxi Kanglin Petroleum Technology Development Co., Ltd. started construction on Wa 2658-4 well on August 20, 2012.

[0074] 1. Reservoir data

[0075] The target layer is Chang 6, the perforated section is 1296-1300m, the effective thickness of the oil layer is 4m, and the fracturing sand is 22m 3 , The porosity is 11.07%, and the oil saturation is 38.13%.

[0076] 2. Construction purpose...