Oil and gas field coiled tubing paraffin removal and contaminant release process and tool thereof

A technology for oil and gas fields and tools, which is applied in the field of wax and scale removal technology for coiled tubing in oil and gas fields and its tools, can solve the problems of difficult implementation, high cost, limited removal effect, etc., and achieves the effect of improving removal effect, saving cost and improving work efficiency.

Pending Publication Date: 2017-05-31
JEREH ENERGY SERVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first three methods have limited removal effects, especially for thicker wax deposits
Although the fourth method has a better cleaning effect, it is expensive and is greatly affected by environmental factors, so it is not easy to implement

Method used

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  • Oil and gas field coiled tubing paraffin removal and contaminant release process and tool thereof
  • Oil and gas field coiled tubing paraffin removal and contaminant release process and tool thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Such as figure 1 Shown: A wax removal and descaling process and tools for oil and gas field coiled tubing, including the following steps:

[0034] a. Prepare standard conversion joints, motor head assembly, vibrating tool, and weighting rod;

[0035] b. Install the prepared standard conversion joint at the end of the coiled tubing;

[0036] c. Connect the prepared standard motor head assembly, vibrating tool, and weight bar conventional tool to the conversion joint;

[0037] d. Assemble the tool string and connect it to the end of the small coiled tubing;

[0038] e. String the tool pipe into the well, start the pump, and operate according to the pre-designed displacement; at this time, the flushing tool is used to clean the sundries, and then the wax remover mechanically scrapes the remaining wax;

[0039] f. During the operation, it is necessary to lift the pipe string after a certain distance, and observe whether the pipe string is blocked; during the operation, i...

Embodiment 2

[0048] Such as figure 2Shown: a process for wax removal and descaling of coiled tubing in oil and gas fields and tools thereof, the tool string in the step d is a spiral tool string, including a string body 1, along the string body 1 on the upper part of the string body 1 Several trapezoidal righting blocks 2 are arranged at intervals in the circumferential direction of the centering block 2, and several support blocks 3 are arranged at spiral intervals along the circumferential direction of the pipe string body 1 on the pipe string body 1 below the righting block 2, and a spiral wax scraper 9 is sequentially arranged. Pass through the top of each support block 3 and cover the outer surface of each support block 3, and set a rotating housing 5 under the support block 3 away from the centralizing block 2, and the inner recesses at both ends of the rotating housing 5 shell A bearing 8 is respectively installed on them, a mandrel 6 is arranged on the pipe string body 1 below the...

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PUM

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Abstract

The invention relates to an oil and gas field coiled tubing paraffin removal and contaminant release process and a tool thereof. Paraffin removal is performed by using coiled tubing, and removed paraffin can be recycled to the ground, and therefore a wellbore cannot be blocked due to human factors. A flushing port is designed at the upper end of a flushing tool, and then paraffin remaining on mechanical scraping portions can be cleared. The coiled tubing is connected with the paraffin removal and contaminant release tool for paraffin removal and contaminant release. The flushing tool at the front end of a pipe string can first perform 360 degree hydraulic cleaning on the wellbore, and then along with descending of the pipe string, a paraffin remover in the pipe string performs mechanical cleaning on the wellbore, and therefore dual cleaning mode combining the hydraulic cleaning with mechanical scraping is achieved, removal effects are greatly improved, cost is saved, and work efficiency is improved.

Description

[0001] Technical field: [0002] The invention relates to a process for removing wax and descaling of coiled tubing in an oil and gas field and a tool thereof. [0003] Background technique: [0004] After the oil and gas well is developed, it enters the production process. Since the produced oil-containing compounds contain various substances, the pressure and temperature are constantly changing as they flow from the ground to the surface. Due to this change, the waxes in the oil-containing compounds are continuously precipitated. The precipitated wax sticks to the well wall, and as the production time increases, the wax will become thicker and thicker. The wax adhered in the well wall will narrow the oil production channel, block the oil production channel at the bottom, and cause the production of oil and gas wells to drop greatly. [0005] At present, the main wax and scale removal processes at home and abroad can be divided into four types, one is hot oil circulation cl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B37/00E21B37/02
CPCE21B37/00E21B37/02
Inventor 宁世品迟帅孙富强
Owner JEREH ENERGY SERVICES
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