Gas well shaft compound blockage treatment method

A composite and wellbore technology, applied in wellbore/well components, earthwork drilling, cleaning tools, etc., can solve problems such as difficult dredging

Active Publication Date: 2021-04-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to overcome the problem in the prior art that complex clogging of gas well wellbore is prone to compo...

Method used

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  • Gas well shaft compound blockage treatment method
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] The wellbore of Yuanba x-1 well was clogged: before the clogging, the oil pressure was 32MPa, and the gas production was 450,000 m3 / day; after the clogging, the oil pressure was 25MPa, and the gas production was 300,000 m3 / day, with a continuous and slow downward trend.

[0079] use as figure 1 The principle of the compound plugging removal process method shown is used for treatment, the same below. First, compound blockage treatment method: for the compound formed by organic bitumen and inorganic cuttings, first use hot water to verify wellbore blockage, displacement ≤ 1m 3 / min, pump hot water 10m from the wellhead to the wellbore 3 , observe the change of pump pressure. The results show that the pump pressure gradually decreases, indicating that the wellbore throttling is not serious, and the plugging solution soaking process is used to remove the plugging treatment. In displacement 0.5~1.0m 3 / min, in sequence, pump 10m from the wellhead to the wellbore ...

Embodiment 2

[0082] The wellbore of Yuanba x-2 well was blocked: before the blockage, the oil pressure was 35MPa, and the gas production was 500,000 cubic meters per day; after the blockage, the oil pressure was 22MPa, and the gas production was 250,000 cubic meters per day, and the downward trend gradually intensified.

[0083] Compound blockage treatment method: For the compound formed by organic asphalt and inorganic cuttings, first use hot water to verify wellbore blockage, displacement ≤ 1m 3 / min, pump hot water 10m from the wellhead to the wellbore 3 , observe the change of pump pressure. The pump pressure remains stable or even rises, which indicates that the wellbore is seriously blocked. The coiled tubing circulation flushing + plugging remover soaking process is used to remove the plugging treatment.

[0084] Under the condition of limited pressure of 70MPa, pump 35m into the wellbore 3 The flushing fluid plays the role of killing the well. A 1.75" coiled tubing string with...

Embodiment 3

[0091] The wellbore of Yuanba x-3 well was clogged: before the clogging, the oil pressure was 40MPa, and the gas production was 550,000 m3 / day; after the clogging, the oil pressure was 30MPa, and the gas production was 300,000 m3 / day, showing a rapid decline trend.

[0092] Compound blockage treatment method: For the compound formed by organic asphalt and inorganic cuttings, first use hot water to verify wellbore blockage, displacement ≤ 1m 3 / min, pump hot water 10m from the wellhead to the wellbore 3 , observe the change of pump pressure. The pump pressure remains stable or even rises, which indicates that the wellbore is seriously blocked. The coiled tubing circulation flushing + plugging remover soaking process is used to remove the plugging treatment.

[0093] Under the condition of limited pressure of 70MPa, pump 35m into the wellbore 3 The flushing fluid plays the role of killing the well. A 1.75" coiled tubing string with a nozzle is run in the wellbore string...

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Abstract

The invention discloses a gas well shaft compound blockage treatment method. The method comprises the following specific steps that 1, shaft blockage is verified through hot water, the hot water is pumped into a shaft from a well mouth, the displacement in the pumping process is smaller than or equal to 1m< 3 >/min, the pump pressure change condition is observed in the pumping process, and the shaft blockage throttling severity degree is judged; 2, if the pump pressure change condition is that the pump pressure is gradually decreased in the hot water pumping process in the step 1, a blockage removal agent injection soaking process is adopted for blockage removal treatment; and 3, if the pump pressure change condition is that the pump pressure is kept stable or even increased in the hot water pumping process in the step 1, a coiled tubing is adopted for cyclic flushing firstly, and then the blockage removal agent injection soaking process is adopted for blockage removal treatment.

Description

technical field [0001] The invention relates to a method for treating gas well shafts, in particular to a method for treating compound plugging in gas well shafts, and belongs to the field of gas well exploitation in gas fields. [0002] The invention solves the problem of preventing and controlling the blockage of gas well wellbore compounds, especially in ultra-deep, high hydrogen sulfide gas fields, such as the second largest acid gas field in China - Yuanba gas field, which can effectively reduce the frequency of gas well compound blockage and effectively control gas well compounds Plugging, recovery of gas well production release. Background technique [0003] Open hole or semi-open hole horizontal wells are commonly used in low-permeability, tight, and thin reservoir gas fields. During the production process of this gas well, oil pressure, oil temperature, and production often decline synchronously in steps, that is, the oil pressure first drops slowly and then drops t...

Claims

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Application Information

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IPC IPC(8): E21B37/06E21B37/00
CPCE21B37/06E21B37/00
Inventor 柯玉彪孙天礼骆仕洪陈曦陈伟黄仕林何海罗扬刘翀黄海洋陈彦梅冯宴易枫温冬来朱国曾力龚小平曹臻徐和先任思齐向军王磊
Owner CHINA PETROLEUM & CHEM CORP
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