Lamellar water logging exhausted oil well blocking and dredging combined tapping potential production increase method

A technology of oil well depletion, which is applied in the field of potential tapping and production increase combined with plugging and dredging, can solve the problems of low success rate, short validity period and high cost, and achieve the effect of low cost, long validity period and low risk

Active Publication Date: 2012-09-19
PETROCHINA CO LTD
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Problems solved by technology

Overcome the shortcomings of existing technologies such as low success rate, short validity period, high risk and high cost

Method used

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Embodiment Construction

[0017] Well number: Well An 50-2

[0018] Oil well location: An 63 fault block in the An 69-90 structural belt of the Hexiwu Sag

[0019] A brief history of oil well production: the well was completed on December 20, 1986, the completion drilling depth: 2652.16m, casing perforation completion, target interval: S 3 Perforated section: 2174.65-2643.78m, artificial well bottom: 2650.08m, perforated oil layer thickness: 74.58m, a total of 23 sub-layers were exploited, put into production on December 31, 1986, and the initial oil pressure of the oil well was 24.7MPa, casing Pressure: 27.30MPa, daily oil production: 16.5t / d, without water, daily natural gas production: 0.57×10 4 m 3 / d; from production to July 2001, the monthly average daily liquid production: 8.3t / d, daily oil production: ≤0.15t / d, water cut: ≥99%, it was judged to be flooded in the main oil layer and closed on August 3, 2001 well.

[0020] When the oil well is in normal production, the downhole layer test resu...

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Abstract

A lamellar water logging exhausted oil well blocking and dredging combined tapping potential production increase method is applied to oilfield development. Production test data are used for determining a low seepage layer or a lower pressure layer which is high in oil saturation and low in recovery percentage to be a potential layer, then well cementation cement paste of metalloid powder is used for plugging an opened oil layer, redundant cement plugs in a shaft are removed in a drilled mode, a new oil outlet channel between the potential layer and the shaft is rebuilt by the potential layer in a mode of depth penetrating hole, and finally dredging and plugging removing are carried out by using acid liquor composed of 1.5-8% of hydrofluoric acid, 5-15% of hydrochloric acid, 2-5% of acetic acid and 1-2% of poly-quaternary amine. Average increased oil production of a single well after production recovery achieves more than 2.7 times, average effective rate is more than 90%, average valid period of the single well is more than 300 days, and average well stimulation cost of oil per ton reduces by more than 80%, so that the method has the advantages of being good in tapping potential effect, high in succeed rate, small in risk, long in period of validity and low in cost.

Description

technical field [0001] The invention relates to the technical field of oil field development, in particular to a method for tapping potential and increasing production by combining plugging and dredging of water-flooded and depleted oil wells. Background technique [0002] At present, the oil layers produced by each oil well in the oil field are generally multi-layered, and the permeability and oil production capacity of the oil layers from top to bottom are not evenly distributed, and can be relatively divided into high-permeability layers and medium-permeability layers according to the difference in permeability. The thickness of the oil layer that can produce oil is called the producing thickness, the thickness of the oil layer that cannot produce oil is called the unproduced thickness, and the corresponding reserves are called producing reserves and unproduced reserves. The ratio of reserves to reserves is the degree of recovery. [0003] When the water content of the o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/25
Inventor 金星刘虎董志君杨曦罗慎超夏志刚蒋蓉袁伟
Owner PETROCHINA CO LTD
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