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A method for determining liquid production rate of a single gas well

A technology to determine the method and fluid production rate, which is applied in wellbore/well components, measurement, earthwork drilling and production, etc. It can solve the problems of gas reservoir evaluation, difficulty in well location deployment, and disputes over gas testing and drainage. Achieve the effect of solving the difficulty of deployment

Active Publication Date: 2019-01-18
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems that the existing wellheads cannot effectively measure the liquid production, resulting in the difficulty of well location deployment, the controversy of gas test and liquid discharge, the problems of gas reservoir evaluation, and the difficulty of gas well management

Method used

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  • A method for determining liquid production rate of a single gas well
  • A method for determining liquid production rate of a single gas well
  • A method for determining liquid production rate of a single gas well

Examples

Experimental program
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Embodiment 1

[0020] According to the principle of conservation of matter, in physical and chemical reaction mixing, the sum of the masses of the substances participating in the reaction mixing is equal to the sum of the masses of the substances produced after the reaction mixing. This law is also applicable to the mixing of produced water from gas wells. The water quality ions in the mixed liquid formed after mixing the produced water from multiple gas wells are equal to the sum of the corresponding water quality ions in the produced water from each gas well before mixing. Through the research and development of single well liquid extraction tools, combined with dynamic monitoring and liquid level testing, and through the analysis of the water samples taken and the water quality test results over the years, on the one hand, the ion content of water quality in most gas wells has not changed much within a period of time and is basically stable. Unless the reservoir changes or the source of wa...

Embodiment 2

[0027] In this embodiment, the method in the above-mentioned embodiment 1 is further described in detail. The collection of water samples and the measurement of the total liquid production in the above-mentioned step 2 are all collected in units of one day.

[0028] Various ions include chloride radical cl in step 2 - , Sulfate SO 4 2- , bicarbonate HCO 3 - , Sodium ion Na + , Potassium K + , calcium ion Ca 2+ , Magnesium ion Mg 2+ , in addition to these common ions, it can also be some other uncommon ions. The final selection should be based on the number of single wells. If the number of single wells is small, the final test can be completed with the content of common ions. If the number of single wells is large, the number of common ions cannot meet the quantity requirements of the equation, and common ions can also be used.

[0029] In step 3, the liquid production rate of each single well is calculated according to the following formulas:

[0030] V=V 1 +V 2 +…...

Embodiment 3

[0044] This embodiment is described with a specific experiment.

[0045] With the aid of a heating furnace to produce wells, water samples are collected from the wellhead, mixed according to different proportions, and the relationship between ions and volumes of single well liquid and mixed liquid is analyzed. The laboratory demonstrates that there is a certain correlation between the water quality ion content and the mixing volume ratio through a total of 17 kinds of ratio relationships in three groups of gas wells. The specific experimental data are shown in Table 1 below:

[0046] Table 1 Statistical table of test results of water quality analysis in three groups of experimental wells

[0047]

[0048] Mix in a 2:7 ratio:

[0049] Calculation of chlorine content=(16907*2+704*7) / 9=4305mg / l;

[0050] The measured chlorine content is 4402mg / l; the error rate is 2.2%.

[0051] Calculate the total salinity = (28829*2+2287*7) / 9=8186mg / l;

[0052] The measured total salinit...

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Abstract

The invention belongs to the technical field of natural gas development and aims to solve the problems caused by the Sulige gas field interwell concatenation and low-cost development mode, that is, multiple single well gas production pipelines are connected to a main pipe for gathering and transportation, only natural gas flowmeters are arranged at well heads without liquid production capacity metering devices, single well liquid production capacity cannot be obtained, and accordingly many problems occur to the gas field development. The concrete content of the single gas well liquid production capacity determining method is determination of a calculation method for the natural gas single well liquid production capacity, the characteristics of single well water quality stability and uniqueness are used, existing gas field dynamic monitoring single well water composition data are combined, a multivariate first-order equation is established by measuring the main pipe total flow and water compositions according to the natural substance conservation principle and parameters such as single well water ions, and finally the single well liquid production capacity is measured rapidly, so that accurate bases are provided for the evaluation of effectiveness of gas recovery measures through water drainage and well site deployment in areas with the complex gas-water distribution relation.

Description

technical field [0001] The invention belongs to the technical field of oil and gas production, and in particular relates to a method for determining the liquid production rate of a single well of a gas well. Background technique [0002] At present, some oil and gas fields follow the low-cost development strategy, and generally adopt the pipeline network mode of "simple metering at the wellhead, and serial connection between wells into the station". The wellhead cannot effectively measure the liquid production, which makes it difficult to deploy well locations, and the gas test and liquid discharge are controversial. , There are many problems in gas reservoir evaluation and difficulty in gas well management. [0003] Take the Sulige gas field as an example. The eastern part of the Sulige gas field has uneven distribution of gas and water on the plane, and local features of high water production. With the extension of the development period, the number of low-yield and low-e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/00
CPCE21B47/00
Inventor 常宏杜支文常永峰张林孙振曹朋亮成育红常森姚欣欣雷国发唐婧李媛
Owner PETROCHINA CO LTD
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