Novel coring and paraffin-removing method for coiled tubing in low-pressure low-yield oil-gas well

A technology for oil and gas wells and a new method, which is used in earth-moving drilling, cleaning equipment, wellbore/well components, etc., can solve the problem of inability to establish wellbore wax blocking profiles, difficulties in wax removal and prevention research, and unsuitable oil and gas wells. and other problems, to achieve the effect of high wax removal efficiency, obvious wax removal effect, and no formation pollution.

Active Publication Date: 2015-09-30
CHINA PETROLEUM & CHEM CORP +1
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  • Description
  • Claims
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Problems solved by technology

Although this method better protects the oil and gas well reservoir, it is not suitable for low pressure and low production oil and gas wells. It cannot use the energy of the oil and gas well itself to bring out the wax after circulating the liq...

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  • Novel coring and paraffin-removing method for coiled tubing in low-pressure low-yield oil-gas well
  • Novel coring and paraffin-removing method for coiled tubing in low-pressure low-yield oil-gas well
  • Novel coring and paraffin-removing method for coiled tubing in low-pressure low-yield oil-gas well

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Embodiment Construction

[0018] The technical solutions of the present invention will be described below in conjunction with the accompanying drawings and embodiments.

[0019] The present invention provides a new wax removal method for coiled tubing coring of low-pressure and low-yield oil and gas wells, which utilizes the technical characteristics of mechanical wax removal and chemical wax removal, and combines the working principle of drilling and coring, including the following steps:

[0020] 1) Close the main valve 1 of the gas tree, the first-level needle valve 3 on the left wing, and the first-level gate valve 4 on the left wing (all other valves on both wings of the gas tree are also closed), open the wax removal valve 2, and install the blowout prevention device according to the requirements for coiled tubing operations 5; At the same time, use a high-pressure pipeline to connect the initial end of the coiled tubing 6 with an outer diameter of φ88.9mm to the process control needle valve 8 and...

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Abstract

The invention provides a novel coring and paraffin-removing method for coiled tubing in a low-pressure low-yield oil-gas well. The method includes the steps of modifying the tail end of the coiled tubing into a coring tool in the form of a 45 degrees angled nib; connecting parts, slowly putting the coiled tubing and the coring tool in the well, and performing coring and paraffin removal; observing interior pressure of the coiled tubing, and if the interior pressure is stable, slowly lifting up the coiled tubing and the coring tool to the surface; after lifting the coiled tubing and the coring tool to the surface, building the pressure with an alcohol injection pump or through residual pressure in the coiled tubing, and collecting a paraffin core. According to the technical features of mechanical paraffin removal and chemical paraffin removal and to the principle of drilling coring, the coring and wax-removing method combining paraffin remover injection by pumping and the coiled tubing is used; the problem that paraffin blockage under low pressure and low yield is better solved, the blocking paraffin in the tubing is cleared, a paraffin-removing profile of a shaft is established, and following production of the oil-gas well is better guided.

Description

technical field [0001] The invention relates to the technical field of oil and natural gas exploitation, in particular to a new wax-removing method for coiled tubing coring of oil and gas wells with low pressure and low production. Background technique [0002] At present, the coiled tubing wax removal technology adopted in domestic wax-deposited oil wells is mainly to establish a liquid (hot water, hot oil, wax remover) circulation channel in the oil and gas well production string through coiled tubing, and then continuously transfer the liquid through circulating heating. The high-temperature heat carried is transferred to the upper end surface of the plugged section in the production string, melting the solidified wax in the production string and returning to the ground with the crude oil or air flow, deepening the coiled tubing while circulating, and finally releasing the plugging in the string. clogged. Although this method better protects the oil and gas well reservoi...

Claims

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Application Information

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IPC IPC(8): E21B37/06
Inventor 陈小刚邓越刘鹏
Owner CHINA PETROLEUM & CHEM CORP
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