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Oil well paraffin remover and inhibitor adding pipe string and method

A technology for removing and preventing wax from oil wells, which is applied to cleaning appliances, earth-moving drilling, wellbore/well components, etc., can solve the problems of waste of medicines, high labor intensity, and difficulty in controlling the concentration of medicines, so as to avoid waste. , Control the effect of dosing concentration

Pending Publication Date: 2020-01-24
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when adding chemical wax remover and anti-wax agent, the labor intensity is high, and the stored medicine is evaporated and lost during the flow process, which wastes part of the medicine, and the concentration of the medicine is not easy to control

Method used

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  • Oil well paraffin remover and inhibitor adding pipe string and method
  • Oil well paraffin remover and inhibitor adding pipe string and method
  • Oil well paraffin remover and inhibitor adding pipe string and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] according to figure 1 The shown dosing string of wax-removing and anti-waxing agent for oil wells includes at least oil pipe 7 and casing 8, and also includes drug dosing pup 1, sucker rod 2, oil well pump 3, screen 4, receiving device 5 and box plugging 6; the dosing nipple 1 is connected to the outer wall of the casing 8 outside the wellhead, and a gate valve is arranged on the dosing nipple 1; the sucker rod 2 is connected in the tubing 7; the pumping The oil pump 3 is connected to the lower end of the sucker rod 2; the screen pipe 4 and the female plug 6 are connected to the inner wall of the oil pipe 7 from top to bottom in sequence, and the screen pipe 4 is located below the oil well pump 3; the receiving device 5 is connected to the screen pipe 4 On the outer wall of the oil pipe 7 between the plug and the female plug 6.

[0032] In actual use, the dosing nipple 1 is installed on the wellhead outer casing 8; the dosing nipple 1 is installed with a gate valve for...

Embodiment 2

[0036] according to figure 1 The shown dosing string of paraffin-removing and anti-paraffin agent for oil wells is different from the first embodiment in that the dosing pup 1 is obliquely connected to the casing 8 .

[0037] Preferably, the included angle between the drug-feeding nipple 1 and the upward direction of the axis of the wellhead casing 8 is 40°-50°.

[0038] Preferably, the angle between the drug-feeding nipple 1 and the upward direction of the axis of the wellhead casing 8 is 45° and the length is 80 cm.

[0039] In actual use, the technical solution of obliquely connecting the dosing nipple 1 and the casing 8 enables the added solid paraffin remover to fall smoothly into the receiving device 5 by gravity.

Embodiment 3

[0041] according to figure 1 and figure 2 The dosing string of an oil well wax remover and anti-wax agent shown is different from the first embodiment in that: the dosing nipple 1 is formed by connecting up and down two cylinders with different diameters, and each cylinder has a A gate valve is respectively installed, the first gate valve 9 is installed on the small diameter cylinder, and the second gate valve 10 is installed on the large diameter cylinder; one end of the small diameter cylinder is connected with the wellhead casing 8 .

[0042] Preferably, the dimensions of the two cylinders with different diameters are respectively: the cylinder with a diameter of 25mm has a length of 50cm, and the cylinder with a diameter of 62mm has a length of 30cm.

[0043] In actual use, when there is no casing gas in the oil well to add the solid paraffin remover, open the first gate valve 9 and the second gate valve 10 at the same time, and then directly add the solid paraffin remov...

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Abstract

The invention belongs to the technical field of oil extraction in oil field, and particularly relates to an oil well paraffin remover and inhibitor adding pipe string and method. According to the oilwell paraffin remover and inhibitor adding pipe string and method, organic setting an oil pipe, a casing, dosing short section, a sucker rod, an oil well pump, a screen pipe, a receiving device and amain plug are arranged organically, after the oil well paraffin remover and inhibitor adding pipe string is connected with an oil well with paraffin to be removed, according to whether casing gas is in the oil well or not, the opening and closing of a first gate valve and a second gate valve are controlled, the solid paraffin remover and inhibitor is added, the solid paraffin remover and inhibitorcan automatically enter the receiving device under the action of gravity and remain still, and the solid paraffin remover and inhibitor can slowly release so that the purpose of controlling the dosing concentration can be achieved and the waste of paraffin inhibitor can be effectively avoided.

Description

technical field [0001] The invention belongs to the technical field of oil production in oil fields, and in particular relates to a pipe string and a method for adding wax-removing and anti-waxing agents to oil wells. Background technique [0002] At present, wax removal and anti-wax in oil wells are mainly carried out by means of hot oil extraction, mechanical, electromagnetic, electric heating, and adding chemical wax-removal and anti-wax agents. Hot washing, electromagnetic, electric heating and other methods of wax removal and anti-wax are costly; mechanical wax removal methods wear the oil pipe; the service life of the solid anti-wax device is short, and the oil pipe rod needs to be removed for replacement, which is costly. A mature and commonly used method of dosing. However, when adding chemical wax remover and anti-wax agent, the labor intensity is high, and the stored medicine is evaporated and lost during the flow process, so part of the medicine is wasted, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B37/06
CPCE21B37/06
Inventor 苏祖波甘庆明刘汉斌黄伟吕亿明王百朱洪征崔文昊常莉静
Owner PETROCHINA CO LTD
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