Method for enhancing acidification effect of oil well of offshore oil field

Abstract

The invention discloses a method for enhancing the acidification effect of oil well of offshore oil field. The method for enhancing the acidification effect of oil well of offshore oil field includesthe following steps that an oil well production pipe string is taken up; an acidification construction operation pipe string is lowered down; ground acidification equipment, a pressure pulse pluggingremoval device and a pipeline are connected, an acidification wellhead manifold valve is closed, and pressure tests of an acidification process pipeline are conducted; a displacing liquid is prepared,a mud pump wellhead manifold valve is opened, and pilot injection of the oil well is conducted; the mud pump wellhead manifold valve is closed, a wellhead manifold valve of the pressure pulse plugging removal device is opened, and an energy generator pneumatic valve is opened or closed; the mud pump wellhead manifold valve is opened, and the pumping and injection of a mud pump are conducted; circulating well cleaning operation is conducted; the mud pump wellhead manifold valve and the wellhead manifold valve of the pressure pulse plugging removal device are closed, the acidification wellheadmanifold valve is opened, and the pumping and injection of an acid liquor are conducted; the acidification wellhead manifold valve is closed, the mud pump wellhead manifold valve is opened, and the pumping and injection of the displacing liquid are conducted; the circulating well cleaning operation is conducted; and the ground acidification equipment, the pressure pulse plugging removal device andthe pipeline are disassembled.

Description

technical field [0001] The invention belongs to the fields of oil and gas field reservoir transformation technology and well completion, and more specifically relates to a method for enhancing the acidizing effect of oil wells in offshore oil fields. Background technique [0002] The development and production of China's offshore oilfields is a high-input, high-risk, high-return measure. Oilfield oil wells usually face damage such as drilling and completion fluids, sand and mud, and organic plugging at various stages of production, resulting in reduced production of oil wells. The main production stimulation technology in the oilfield is acidizing technology, which has been applied in more than 2,000 wells since 1985. It is a low-cost stimulation technology with a wide range of applications. The proportion of oil wells with medium and low permeability increases, and the acidizing technology faces the problem of weakening production increase effects. For example, the acidizin...

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the deficiencies in the prior art, and propose a method for enhancing the acidizing effect of oil wells in offshore oil fields, which can enhance the acidizing effect of oil wells in offshore oil fields. Increase production, avoid a series of problems such as acid liquid environmental protection treatment, equipment strain, and pipe string corrosion caused by serious reservoir blockage and long acidizing operation time in offshore oilfields. The risk of secondary precipitation pollution by reservoir acidification is avoided. At the same time, the problems of using pressure pulse plugging removal technology alone to adapt to clogging, limited reservoir types, limited effect, and easy acceleration of reservoir sand production are solved by acidizing technology. This method is simple and convenient. Low operating cost, suitable for offshore oilfield platforms with limited space, high operating costs, need to improve success rate, avoid working in the oil jacket annulus, etc., organically combine the existing pressure pulse plugging removal technology with offshore oilfield acidizing

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