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Determination method of well killing occasion of pressing-back method for gas well

A method of determination, a technique for killing wells, applied in wellbore/well components, earthmoving, surveying, etc.

Active Publication Date: 2016-07-13
CHINA PETROCHEMICAL CORP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problems existing in the pressure-back method when drilling into a high-pressure gas layer, the present invention proposes a method for selecting the timing of the pressure-back method of a gas well, which is especially suitable for drilling into a gas layer and there is no drilling fluid in the well. Theoretical calculation of key parameters such as pressure can select the timing of well killing, thereby reducing the risk of excessive wellhead pressure during the well killing process and providing guarantee for successful well killing

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  • Determination method of well killing occasion of pressing-back method for gas well
  • Determination method of well killing occasion of pressing-back method for gas well
  • Determination method of well killing occasion of pressing-back method for gas well

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Embodiment Construction

[0043] The present invention will be further described below in conjunction with accompanying drawing 1.

[0044] As shown in Fig. 1, after the blowout of the high-yield gas formation encountered in gas drilling, the killing method of the present invention comprises the following steps:

[0045] 1. Collect formation and fluid physical parameters through geological logging data and adjacent well data

[0046] After a blowout occurs, the parameters including formation pressure, rock porosity, permeability, production layer thickness, gas density, gas viscosity, wellbore size and formation pressure boundary are obtained through mud logging data and adjacent well data.

[0047] 2. Draw the IPR curve at the bottom of the well

[0048] From the obtained formation and fluid parameters, the gas production q is plotted according to the following equation gs and bottom hole pressure p wf The inflow dynamics curve (IPR) of the relationship.

[0049] p ...

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Abstract

The invention discloses a determination method of a well killing occasion of a pressing-back method for a gas well. The determination method of the well killing occasion of the pressing-back method for the gas well comprises the following steps of collecting the physical property parameters of a stratigraphic rock and a fluid through geological logging and the data of an adjoining well; drawing an IPR (Inflow Performance Relationship) curve of the gas well by a formula through the collected data; drawing an OPR (Outflow Performance Relationship) curve of a relationship between a pit shaft gas yield and bottom hole pressure; drawing the IPR curve and the OPR curve in the same coordinate system; calculating an allowable maximum well shut-in time; calculating a wellhead pressure function when the well killing is started at some moment after well shut-in; solving wellhead maximum pressure; judging latest time when the well killing is started. The method is applicable to the conditions that the circulating well killing cannot be carried out due to the well blowout of the gas well and the pressing-back method is adopted to carry out the well killing; the latest well killing time that the well is successfully killed by using the pressing-back method after the well shut-in can be calculated; therefore, the risk that wellhead pressure generated in a well killing process exceeds maximum allowable wellhead pressure can be removed; the theoretical guidance is provided for the success of the well killing. The method is uncomplicated in calculation process, simpler in operation technique, and suitable for field use.

Description

technical field [0001] The invention relates to a method for judging the timing of a well killing when the pressure-back method is adopted when drilling encounters a blowout in a gas layer or when the well cannot be killed by circulation, and belongs to the technical field of oil drilling well control. Background technique [0002] With the rapid growth of the national economy, my country's demand and dependence on oil and natural gas energy is increasing day by day. At present, the eastern oilfields have entered the late stage of development, the oil wells have high water content, and it is difficult to make a major breakthrough in crude oil production. In the future, the central and western oilfields will become the focus of drilling and development. Due to the high formation pressure and abundant natural gas resources in the western oilfields, well kicks, overflows and even blowouts are prone to occur during drilling. Conventional well killing methods such as conventiona...

Claims

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Application Information

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IPC IPC(8): E21B47/00E21B49/00
Inventor 公培斌李宗清陈永明王树江朱焕刚宋荣荣曹强康波宋中文李建新于海叶
Owner CHINA PETROCHEMICAL CORP
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