Chemical pulse compound unplugging method

A pulse and chemical technology, which is applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc., can solve the problems of many times of drawing pipe string, complicated construction, unsatisfactory plugging effect, etc., and achieve simple construction and shorten construction Cycle, improve the effect of plugging removal effect

Inactive Publication Date: 2009-07-22
中国石化股份胜利油田分公司孤岛采油厂
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a chemical pulse compound plugging removal method, which solves the problems of complex construction, many times of using pipe strings and unsatisfactory plugging removal effect in the above-mentioned prior art

Method used

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  • Chemical pulse compound unplugging method

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example 1

[0020] Example 1: Well GD1-7-411, the thickness of the reservoir is 5.1m, and the average daily fluid production in August 2006 is 5.5m 3 Analyzed that during the production process, mud migration caused blockage of the sand control string and pollution in the near-well area. The design uses pressure pulses to fluctuate the oil layer, and compound acidification and plugging agent to remove the pollutants and blockages in the near-well area. Objects, dredge the strata.

[0021] The well was constructed on August 29, 2006. The production pipe 4 was not moved, and 5m was injected from the tee 2 injection pipe 3 with a 400 cement truck. 3 Acidify the plugging release agent and inject the oil layer 5 from the casing 6. The original solution is 0.8t, the use concentration is 20% after preparation, the processing radius is 1m, the injection pump pressure is stable and less than 12Mpa, and the well is shut in for 2-3 hours. Connect the tee 2 and the pressure pulse generator 1 to the outsi...

example 2

[0023] Example 2: Well GD2-28X239, the thickness of the oil layer is 6.8m, and the average daily fluid production in September 2006 is 5.1m 3 According to analysis, it is believed that the thick oil in the production process causes blockage in the near-well area. The design uses pressure pulses to fluctuate and impact the oil layer, and compound viscosity reducers to remove the heavy oil blockage in the near-well area and dredge the formation.

[0024] The well was constructed on September 7, 2006. The oil production string was not moved, and 6m was injected with a 400 cement truck. 3 The thick oil viscosity reducer stock solution is 0.6t, the use concentration is 10% after preparation, the processing radius is 1m, the injection pump pressure is stable and less than 12Mpa, and the well is shut in for 2-3 hours. Connect the tee and pressure pulse generator to the outside of the casing gate, connect the power supply of the pulse generator control device, and place the pressure pulse...

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Abstract

A chemical pulse compound plugging removal method, characterized in that the chemical agent is directly injected into the wellbore and the oil layer by connecting the pipeline to the wellhead casing and connecting the cement truck after selecting the chemical agent and the dosage under the condition of not moving the pipe string. After the injection of the agent, close the casing and react for 2 to 3 hours, then connect the pulse generator, inject gas into the wellbore through the casing, and after the pressure in the well reaches a certain value, use the pulse generator to rapidly reduce the pressure according to the pressure gradient to generate pressure. The pulse wave causes formation plugs to produce a composite effect of pulse and chemical plugging agent under the action of pressure waves alternately changing in positive and negative directions. The invention has simple construction, does not use pipe strings, shortens the construction period, saves construction costs, improves the plugging removal effect of the oil well, and increases the crude oil output.

Description

1. Technical Field [0001] The invention relates to the field of petroleum exploitation, belongs to the technology of removing plugging in oil extraction technology, and specifically is a chemical pulse compound removing method. 2. Background technology [0002] With the extension of oilfield development time, whether it is an oil (gas) well or a water injection well, its productivity index or water absorption index will decrease significantly. The main reason is that the pore channels are blocked by mud, sediment, various emulsions, paraffins, colloidal asphaltenes and other mechanical impurities, which reduces the permeability of the oil layer and causes the decrease in liquid production or water injection. Mud or cement slurry during the drilling process and cementing process will pollute the oil layer near the borehole wall, and the killing work during the workover process sometimes pollutes the formation. The above-mentioned various factors will reduce the permeability of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/25E21B43/27E21B28/00
Inventor 肖建洪陈辉姜娜宋岱锋韩鹏
Owner 中国石化股份胜利油田分公司孤岛采油厂
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