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Alcohol injection process for medium and low pressure natural gas collection

A process method and natural gas technology, which are applied in gas/liquid distribution and storage, pipeline systems, mechanical equipment, etc., can solve the problems of large alcohol injection volume, high alcohol injection pressure, and high alcohol injection investment, so as to avoid deviation of alcohol injection volume. , the effect of reducing the amount of manual labor

Active Publication Date: 2016-09-14
RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It mainly adopts centralized alcohol injection in the gas gathering station, and the alcohol injection pipeline radiates to the wellhead through the pipe trench to realize alcohol injection to the wellbore. The disadvantage is that the alcohol injection pressure is high (up to 25Mpa), the amount of alcohol injection is relatively large, and the investment for alcohol injection is relatively high

Method used

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  • Alcohol injection process for medium and low pressure natural gas collection
  • Alcohol injection process for medium and low pressure natural gas collection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Such as figure 1 , figure 2 The overall flow diagram of this medium pressure gas gathering method is shown in the schematic diagram, which includes cluster well group 1, gas production wellhead 2, gas production pipeline from well site to gas gathering station 3, alcohol injection pipeline from gas gathering station to well site 4, gas gathering Station 5, gas-gathering station export pipeline 6.

[0026] The cluster well group 1 is composed of 2~6 natural gas wells 9. There is a downhole choke in the gas well 9. The distance between the downhole choke and the wellhead device 2 is 1500~3000 meters. pressure, through the gas production wellhead device 2, the gas production pipeline 3 from the well site to the gas gathering station, and then transported to the gas gathering station 5. Gas, to complete the entire gas gathering process of the gas field.

[0027] The alcohol injection process in the initial stage of production is as follows: methanol self-injection devic...

Embodiment 2

[0030] The wellhead device 2 includes: a wellhead shut-off valve 10, a flow meter 11, a natural gas shut-off valve 12, a natural gas manifold 13, a check valve 14, and a methanol shut-off valve 15.

[0031] The direction of natural gas within the scope of the well site is: wellhead shut-off valve 10 → flow meter 11 → natural gas shut-off valve 12 → natural gas manifold 13 → exit the well site;

[0032] The direction of methanol within the scope of the well site is: gas gathering station to well site alcohol injection pipeline 4 → methanol shut-off valve 15 → check valve 14 → natural gas manifold 13 injection. Check valve 14 ensures that natural gas can not enter in the alcohol injection pipeline.

Embodiment 3

[0034] The gas gathering station 5 includes: an alcohol injection device 8, a production separator 19, a cyclone separator 20, a sewage tank 21 and supporting pipelines.

[0035] The alcohol injection device 8 includes: a double-head filling pump 16, a methanol storage tank 18, an alcohol injection pipeline 4 connecting the gas gathering station to the well site, and a single-head filling pump 17 for injecting alcohol into the gas-gathering station output pipeline 6 and its accessories pipeline.

[0036] The direction of natural gas in the gas-gathering station is: incoming pipeline → production separator 19 → cyclone separator 20 → external pipeline 6 of the gas-gathering station;

[0037] The direction of methanol is: (early stage) methanol storage tank 18 → double-head filling pump 16 → gas-gathering station to well site alcohol injection pipeline 4; (middle and late stage) methanol storage tank 18 → single-head filling pump 17 → external injection of alcohol Line 7.

[003...

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Abstract

The invention provides an alcohol injection process method for medium and low pressure natural gas collection, and belongs to the field of natural gas collection. An outer alcohol transportation and injection pipeline where a methyl alcohol storage tank is connected with a gas gathering station outer transportation pipeline is arranged at a gas gathering station, one end of the outer alcohol transportation and injection pipeline is connected with the methyl alcohol storage tank, and the other end of the outer alcohol transportation and injection pipeline passes through a single-head filling pump and is connected into the gas gathering station outer transportation pipeline; an alcohol injection pipeline from the gas gathering station to a well site is arranged on the gas gathering station, one end of the alcohol injection pipeline is connected with the methyl alcohol storage tank, and the other end of the alcohol injection pipeline passes through a double-head filling pump and then is connected with a natural gas manifold; the alcohol injection pipeline from the gas gathering station to the well site and a gas production pipeline from the well site to the gas gathering station are laid in one ditch. A wellhead heat preservation mode is adopted for wellheads of gas wells to the natural gas manifold to prevent hydrates from being generated. A well site alcohol injection process is adopted on the basis of traditional processes, the average number of single-well alcohol injection pipes and the number of alcohol injection pumps are reduced to a great extent, the probability of inaccuracy of alcohol injection due to different single well yields in single-well alcohol injection is reduced, meanwhile, the methyl alcohol storage tank and the filling pumps are not arranged at the well site, and therefore influences of snow and rain weather on production under mountainous area topographic conditions are reduced.

Description

technical field [0001] The invention belongs to the field of natural gas collection, and relates to an alcohol injection process method for medium and low pressure natural gas collection. Background technique [0002] When the natural gas produced from the wellhead contains moisture, when its temperature drops to a certain value, it will form solid hydrate, which will cause blockage of pipelines and equipment. In order to prevent the formation of hydrates during natural gas transportation, measures to prevent the formation of hydrates must be taken. At present, methods to prevent hydrate formation usually include heating, dehydration, methanol injection, etc. [0003] Adding hydrate inhibitors (also called alcohol injection) is an important measure and an effective method to prevent hydrate formation. Methanol and ethylene glycol are the most widely used thermodynamic inhibitors at present. By changing the chemical potential of the hydrate phase, the hydrate formation cond...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F17D3/12
Inventor 张春威张书勤韩建红闫旭梁裕如薛红波胡耀强易冬蕊杨朝锋王涛
Owner RES INST OF SHAANXI YANCHANG PETROLEUM GRP