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A small diameter drainage gas production pipe string

A gas production pipe, small diameter technology, applied in drilling pipe, casing, earth-moving drilling, etc., can solve the problems of limited application and promotion, high price of coiled tubing, improve liquid carrying capacity, reduce overall weight, and low cost. Effect

Active Publication Date: 2017-07-14
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high price of coiled tubing and the need for supporting professional operating tools, the construction cost of a single well is generally more than 450,000 yuan, which greatly limits the application and promotion of this technology

Method used

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  • A small diameter drainage gas production pipe string
  • A small diameter drainage gas production pipe string

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Gas wells with a well depth of less than 3,000 meters. Well Sudong A is 2991.5m deep, and the tubing is 2975m deep. Before the test, the oil pressure was 2.27MPa, the casing pressure was 8.85MPa, the oil casing pressure difference was 6.58MPa, and the average daily gas production was 0.43×10 4 m 3 / d. Since the well depth is less than or equal to 3000m, 45# carbon steel seamless pipes (1) and their joints (2) are used in the whole well section, and run in by connecting single pipes, see figure 1 .

[0027] The depth H of the tubing string is 2975m. Since the tubing is fixed by free suspension, the tensile load of the tubing at the wellhead suspension is the largest. According to formula 2, the maximum tensile load is:

[0028] (Formula 3)

[0029] According to formula 3, the maximum tensile load at the wellhead is 227MPa, therefore, the safety factor of the wellhead tubing is 1.55, which can meet the production demand.

[0030] After the test, the oil pressure o...

Embodiment 2

[0033] Gas wells with a well depth greater than 3,000 meters. Well Su B is 3349m deep, 3320m down the tubing, the oil pressure before the test was 1.15MPa, the casing pressure was 7.12MPa, the casing pressure difference was 5.97MPa, and the average daily gas production was 0.38×10 4 m 3 / d. Since the well depth is greater than 3000m, the pipe string is lowered in combination. The upper part of the wellbore is made of 45# carbon steel seamless pipe (1) and its joint (2), and the lower part is made of 5083 aluminum alloy seamless pipe (1) and its joint (2). ), use the single root method to download, refer to figure 1 .

[0034] The depth H of the tubing string is 3320m. According to formula 2, the maximum tensile load of the wellhead tubing is:

[0035] (Formula 4)

[0036] In the formula, W pe1 is the unit mass of 5083 aluminum alloy tubing, 1.16kg / m, H 1 is the total length of the aluminum alloy tubing; W pe2 The unit mass of 45# carbon steel tubing is 3.33kg / m, H 2...

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Abstract

The invention relates to a minor-diameter water draining and gas producing pipeline column. The pipeline column is composed of a seamless tube (1) and a connector (2). Materials used for the seamless tube (1) are divided into two kinds, one is 45 # carbon steel, and the other is 5083 aluminium alloy. When the well depth is equal or lesser than 3000 meters, the 45 # carbon steel seamless tube (1) and the connector (2) are adopted on the whole well section, and the mode of connecting a single rod is adopted; when the well depth is greater than 3000 meters, the compound mode is adopted by the pipeline column, the 45 # carbon steel seamless tube (1) and the connector (2) are adopted on the upper portion of a shaft; the 5083 aluminium alloy seamless tube (1) and the connector (2) are adopted on the lower portion of the shaft, the mode of connecting the single rod is adopted, an insulated joint is adopted on the transition part between the two kinds of oil pipes, and the galvanic corrosion is prevented from happening; the water draining and gas producing function of the pipeline column is equivalent to a coiled tubing, but the cost of the pipeline column is 40-50 percent of the coiled tubing. By narrowing the gas producing channel of a gas well, the liquid carrying capacity of the gas well is improved, so that water is timely discharged from the shaft, the gas well productivity is recovered, and the production period is prolonged.

Description

technical field [0001] The invention discloses a small-diameter drainage gas production pipe string, relates to the technical field of oil and gas field gas production, and particularly relates to a low-cost small-diameter drainage gas production pipe string. Background technique [0002] During the production process of most low-pressure and low-yield gas wells in China, hydrocarbon condensate or formation water will flow into the bottom of the well. In the early stage of production, the formation pressure is high and the liquid-carrying capacity is strong, and the produced water will be brought to the ground along with the produced gas. As the production years of the gas well increase, the energy of the formation naturally weakens, making the liquid-carrying capacity of the gas well worse and worse, and the produced gas will not meet the requirements of continuous liquid-carrying due to the low flow rate, resulting in increasing liquid accumulation in the wellbore. The ba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B17/00C22C38/42C22C21/08
CPCC22C21/08C22C38/42E21B17/00
Inventor 奚运涛慕立俊付钢旦杨全安李琼玮李明星董晓焕程碧海李慧张振云
Owner PETROCHINA CO LTD
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