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Method for determining temperature of well washing through oil well hollow rod

A certain method, hollow rod technology, applied in the direction of wellbore/well components, earthwork drilling, isolation devices, etc., to achieve the effect of saving fuel

Active Publication Date: 2014-12-17
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, there is no explanation on how to efficiently and economically heat-wash the oil well with the hollow rod well-washing device, and the determination of the hot-washing temperature is still being carried out by field technicians based on experience.

Method used

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  • Method for determining temperature of well washing through oil well hollow rod
  • Method for determining temperature of well washing through oil well hollow rod
  • Method for determining temperature of well washing through oil well hollow rod

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: A method for determining the flushing temperature of an oil well hollow rod, comprising the following steps;

[0034] Step 1. Determine the parameters of the thermally washed oil well with the hollow rod well washing device, and establish a mathematical model:

[0035] Y=a+bX

[0036] In the formula:

[0037] Y—oil outlet temperature at the wellhead of the oil well, °C;

[0038] X—hot car washing outlet (hollow rod inlet temperature), °C;

[0039] a—regression constant;

[0040] b—regression coefficient.

[0041] Step 2. Collect the actual values ​​of the parameters of 30 oil wells using the hollow rod flushing device for hot flushing oil wells, as shown in Table 1.

[0042] Table 1

[0043]

[0044]

[0045] Step 3. Calculate the regression coefficient to obtain the regression equation.

[0046] b = Σ X i Y ...

Embodiment 2

[0067] Taking Jin 93-18 as an example, the application of the present invention will be described in detail.

[0068]In Well Jin 93-18, the freezing point of crude oil is 31°C, the wax content is 14.38%, the original wax point is 40°C, the hollow rod is lowered to a depth of 800m, and the oil output temperature at the hot-washed wellhead is 56°C according to the production requirements. According to the mathematical model, Y=40.5043+ 0.2315X is obtained, and the hot car washing outlet temperature X=67℃ can meet the hot washing requirements. During the on-site hot washing, the outlet temperature of the hot car washing is controlled between 66-69 °C, and the hot washing operation is successful.

Embodiment 3

[0069] Embodiment 3: Taking Jin 55 as an example, the application of the present invention is described in detail.

[0070] In Well Jin 55, the freezing point of crude oil is 34°C, the wax content is 17.19%, the original wax point is 43°C, and the hollow rod is lowered to a depth of 800m. According to the production requirements, the oil output temperature of the hot-washed wellhead is 58°C. According to the mathematical model, Y=40.5043+0.2315X It is obtained that the hot car washing outlet temperature X=75.6℃ can meet the hot washing requirements. During the on-site hot washing, the outlet temperature of the hot car washing is controlled between 75-78°C, and the hot washing operation is successful.

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Abstract

The invention relates to a method for determining the temperature of well washing through an oil well hollow rod and belongs to the field of oil production engineering in the petroleum industry. The method comprises the steps that (1) parameters of hot oil well washing by applying a hollow rod well washing device are determined, and a mathematical model is established; (2) actual values of parameters of hot oil well washing for 30 well times of the oil well by applying the hollow rod well washing device are collected; (3) regression coefficients are calculated, and a regression equation is obtained; (4) the regression equation is verified; (5) the temperature of well washing through the oil well hollow rod is determined. The linear relation between a variable X and a variable Y is showen to be reasonable through mathematical prediction established based on the data of 30 well times of onsite actual hot washing, verification of the correlation coefficients R, verification of the significance of the regression coefficients and verification of the significance F of the regression equation. According to the method, the temperature of well washing through the oil well hollow rod is determined according to the mathematical model, the defect that onsite technicians determine the temperature of hot washing on an oil well by using the hollow rod well washing device through experience is overcome, and fuel needed for hot well washing of the oil well is saved.

Description

technical field [0001] The invention relates to a method for determining the flushing temperature of a hollow rod of an oil well, and belongs to the field of oil recovery engineering in the petroleum industry. Background technique [0002] In the process of oil field development, it is often necessary to perform well washing operations on oil wells. After the low-permeability oil well is hot-washed, due to the pollution of the oil layer by the well-washing fluid, the production of the oil well will decrease or even the phenomenon of no fluid will often occur. [0003] Ma Wentian published in the 2011 Petroleum Geology and Engineering Supplement "Research and Application of High-efficiency Well Cleaning and Pollution Prevention Pipe String" A set of high-efficiency well clean Anti-pollution string, the casing string is mainly composed of Y221 drainable packer, telescopic compensator, double-acting bridge-type check valve, etc. The field application of 5 wells in Shenyang Oi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B37/00E21B36/00
Inventor 付亚荣马永忠刘春平李冬青付丽霞曹瑾李小永姜一超李淼李华君李明王志霞彭菁菁
Owner PETROCHINA CO LTD
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