Continuous circulation system for oil and gas well and usage thereof

A circulatory system, oil and gas well technology, used in earth-moving drilling, flushing wellbore, wellbore/well components, etc., can solve the problems of low pressure, easy injury, inability to achieve circulation, etc., to improve safety and improve controllability effect of preventing post-work injury

Inactive Publication Date: 2005-09-07
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The biggest defect of this circulation method is: once the drill string is disconnected (such as artificially disconnected, including tripping and connecting a single root; such as fault disconnection, including accidents such as stuck, broken, dropped, punctured, blocked, etc. ), the circulation will

Method used

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  • Continuous circulation system for oil and gas well and usage thereof
  • Continuous circulation system for oil and gas well and usage thereof
  • Continuous circulation system for oil and gas well and usage thereof

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specific Embodiment approach

[0015] The three categories and eight uses proposed by the present invention mainly utilize the four functions that the system can realize: the function of adjusting the fluid column pressure in the well; the function of continuous circulation; the function of multi-channel injection and return; Features. The specific implementation of the above four functions is as follows:

[0016] 1. The function of adjusting the fluid column pressure in the well

[0017] There are two ways to achieve this function: one is injection mixing of drilling fluids with different densities, and the other is increasing or decreasing the gas injection volume.

[0018] Injection mixing of drilling fluids with different densities:

[0019] At this time, three drilling fluids 1, 2, and 3 with different densities are prepared at the well site. One is pre-designed normal drilling fluid 1, such as 1.5 g / cm 3 ; The second is heavy drilling fluid 2 as heavy as possible, such as 2.2 g / cm 3 ; The third i...

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Abstract

The invention relates to continuous circulation system that is constituted by multifunction injection system, in well circulation system and ground returning system. The injection system includes drilling fluid that has three densities, two or three mud pumps, and high pressure gas injection device. By the method of injecting two drilling fluids that have different density and fast mixing, or injecting high pressure gas, the in-well liquid column pressure would be adjusted fast and flexibly. The in-well circulation system includes double tube well structure and in-well drilling column, and supplies three flowing channels as the returning channel or injecting channel. The ground returning system includes well head control combination, casing head and gas-liquid-solid separating device. The continuous circulation system is constituted by eight purposes and improves the safety of the well.

Description

Technical field: [0001] The invention relates to a continuous circulation system used for drilling, well completion and workover of oil and gas wells and its application method. It is also suitable for drilling, completion and workover operations in geothermal, hydrological and mineral fields. Background technique: [0002] During the drilling process of oil and gas wells, the circulation system consists of three parts: the surface injection part, including tanks (pools) and pumps; the well circulation part, including the drill string, drill bit and wellbore; device, solid phase separator, etc. The drilling fluid circulation method currently used is: the mud pump sucks drilling fluid with a predicted density from the tank (or pool), and after pressurization, it is transported to the drill bit through the inner diameter flow channel of the hollow drill string, and reaches the bottom of the well through the nozzle of the drill bit, and then Enter the annular space between th...

Claims

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Application Information

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IPC IPC(8): E21B21/00E21B21/01E21B21/08
Inventor 孟英峰梁红
Owner SOUTHWEST PETROLEUM UNIV
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