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Method for testing erosion resistance of throttle valve of three-high oil-gas well

A test method and throttle valve technology, applied in the direction of strength characteristics, test wear resistance, measuring devices, etc., can solve the problems such as the working conditions that do not take into account the continuous ejection, and achieve the effect of rapid drilling

Pending Publication Date: 2020-12-15
CHINA PETROLEUM & CHEM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The erosion test device disclosed above mainly focuses on the method of using high-pressure fluid to perform single-point erosion on the material coupon of the throttle valve, but does not conduct overall erosion performance evaluation research on the throttle valve, and does not take into account the three-high The working condition of mixing and continuous injection of drilling fluid and downhole gas in the case of gas well killing

Method used

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  • Method for testing erosion resistance of throttle valve of three-high oil-gas well
  • Method for testing erosion resistance of throttle valve of three-high oil-gas well
  • Method for testing erosion resistance of throttle valve of three-high oil-gas well

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] PCV throttle valve erosion test

[0096] Test process: the test medium is 1.8g / cm 3 For mud, the whole process is accompanied by nitrogen injection, the test pump strokes 60-80 times / min, the test pump pressure is 20-35MPa, the valve opening is about 1 / 8 (7mm~9mm), and the test time is 490min.

[0097] Test results: The highest pump pressure reaches 44MPa instantaneously, accompanied by multiple instantaneous pressure rises. Because the impact pressure is too large, the pressure difference between the upper and lower sides is 10MPa, so the control pressure is 30MPa. The experiment shows that the valve can be stabilized at a pressure of 30±5MPa. run.

Embodiment 2

[0099] Wedge throttle valve erosion test

[0100] Test process: test medium 1.8g / cm 3 For mud, the whole process is accompanied by nitrogen injection, the test pump strokes 110 times / min, the test pump pressure is 12-17MPa, the valve opening is about 1 / 10 (2mm~4mm), and the test time is 486min.

[0101] Test results: When the pump speed is raised to the highest and the opening is the smallest, the pump pressure cannot exceed 20MPa when using the wedge-shaped throttle valve. The experiment shows that the valve can operate stably at a pressure of 12.5±2.5MPa.

Embodiment 3

[0103] Erosion test of orifice throttle valve

[0104] Test process: the test medium is 1.8g / cm 3 For mud, the whole process is accompanied by nitrogen injection, the test pump strokes 110 times / min, the test pump pressure is 14-23MPa, the valve opening is about 1 / 8 (7mm-9mm), and the test time is 315min.

[0105] Test results: During the test, the pump pressure dropped from high pressure to 4MPa many times instantaneously, and the pressure rose to the original pressure after switching the movable valve. The last time the pressure dropped from 14MPa to 4MPa, the time was 1min. The valve was considered damaged and stopped. test.

[0106] test results

[0107] According to the analysis of the dynamic test results, the evaluation results of PVC throttle valve, wedge throttle valve and orifice throttle valve are shown in the following table:

[0108] Type of throttle valve Erosion resistance Choke and kill reliability Compliance with well control process require...

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Abstract

The invention discloses a method for testing erosion resistance of a throttle valve of a three-high oil-gas well. The method comprises the following steps: designing experimental parameters; preparingexperimental materials; connecting the throttle valve and the variable-angle nozzle; connecting a test device to check air tightness; starting a pumping system, and observing the passing condition ofthe erosion fluid in the throttle valve and the throttle manifold; adjusting the gas and liquid discharge capacity to meet the experimental requirements; opening a valve of the buffer tank and a slurry return pump; after the experiment is finished, stopping the pump to release pressure; disassembling the throttle valve, checking the erosion degree, and analyzing the erosion damage reason; and carrying out next experiment. According to the invention, the erosion effect of throttling well killing on the throttle valve and the throttle manifold can be accurately and visually simulated under thecondition of mixed gas heavy mud, and the reliability and erosion resistance of the throttle valve and the conformity and adaptability of the throttle valve to well control technical process requirements are evaluated.

Description

technical field [0001] The invention relates to the technical field of well control safety of oil and gas wells, in particular to a method for testing the anti-erosion performance of throttle valves of three-high oil and gas wells. Background technique [0002] Three-high oil and gas wells refer to oil and gas wells characterized by high pressure, high production or high sulfur content. During the drilling process, due to the special safety production of Sangao Wells, once an out-of-control blowout accident occurs, the formation gas will pour into the drilling tool and carry the drilling fluid out of the ground, which will easily cause serious damage to oil and gas resources and equipment and facilities, and cause heavy casualties. Harsh social impact, therefore, whether its safety management and risk control are in place becomes particularly important. [0003] The choke valve is the key equipment in the well control manifold. Whether the choke valve can work normally is d...

Claims

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Application Information

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IPC IPC(8): G01N3/56G01N3/02
CPCG01N3/567G01N3/02G01N2203/0019G01N2203/0042G01N2203/0676
Inventor 李千登孙光鹏刘铭刚樊朝斌厉建祥涂茂川逄铭玉崔靖文方晓庆杨勇
Owner CHINA PETROLEUM & CHEM CORP
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