Gas injection pressure-stabilizing drilling method

A technology for drilling and stabilizing pressure, which is applied in drilling equipment and methods, drilling equipment, earthwork drilling and production, etc. It can solve the problems of being unable to adapt to fluid-containing strata in the narrow "blowout safety pressure window", so as to improve safety and ensure safety Effect

Inactive Publication Date: 2008-03-12
SOUTHWEST PETROLEUM UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] The purpose of the present invention is to solve the fluid-containing formations where the existing drilling technology cannot adapt to the narrow "blowout safety pressure window", solve the technical problems of blowout, blowout or both blo

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Embodiment Construction

[0053] The present invention will be further described below in combination with specific embodiments and accompanying drawings.

[0054] The blowout preventer combination for underbalanced drilling is equipped at the wellhead, including rotary control head (RCHS) or rotary blowout preventer (RBOP), and the return system is equipped with choke valves for underbalanced drilling, choke manifolds, multiphase separators, Closed circulation system, spray ignition device, etc.

[0055] The wellhead is also equipped with a high-pressure gas injection system, as shown in Figure 1, the high-pressure gas injection system includes a mud tank 1, a mud pump 2 connected to the mud tank 1, a mixer 3 connected to the mud pump 2, and one end of the mixer 3 is connected to The other end is connected to the three-way cock valve 4, the three-way cock valve 4 is connected to the one-way valve 5, the one-way valve 5 is connected to the flow meter 6, and the flow meter 6 is connected to the needle v...

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Abstract

The invention discloses an air-injection stable-pressure well-drilling method and relates to a well-drilling method for petroleum and natural gas exploration and exploitation, in particular to a well-drilling method that can overcome the difficulties of fluid formation leakage, blowout and narrow safety window; the invention resolves the following difficult problems in prior well-drilling technologies: Not possible to adapt to leakage, blowout and narrow safety pressure window reservoirs, but easy to result in blowout, leakage or both during the well-drilling process; during the course of drilling fluid circulation, the invention adopts an air-injection method with suitable volume of air to eliminate the auxiliary friction resistance and dynamic pressure in drilling fluid circulation; before stopping the circulation, coming out of the hole or going into the hole, or in idling await status, repeatedly adopt pressure building, degasification, grouting amd release high-pressure gas to fulfill balanced killing; before the air-injection stable-pressure well-drilling is excuted, utilize a MWD method to test reservoir parameters, so as to determine whether utilizes the method and how to utilize the method. The invention discloses the well-drilling method to decrease the downhole pressure variation window into a narrow line, so that the window can be completely included in the leakage and blowout safety pressure window; therefore, the invention adapts to well-drilling in exploration and development of oil and natural gas.

Description

technical field [0001] The invention relates to a drilling method for a fluid-containing formation, in particular to a drilling method suitable for a narrow blowout safety window in the process of exploration and exploitation of oil and natural gas. Background technique [0002] During oil and natural gas exploration drilling or production drilling, when drilling into a fluid-containing formation, such as oil, gas, water, etc., the formation has two pressures - pore pressure and leakage pressure. If the pressure of the drilling fluid acting on the bottom of the well is greater than the loss pressure of the formation, lost circulation will occur - the drilling fluid leaks into the formation; if the pressure of the drilling fluid acting on the bottom of the well is less than the pore pressure of the formation, a blowout will occur - the formation fluid enters the formation In the well, gushing to the ground. [0003] Both lost circulation and blowout must be avoided in effici...

Claims

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Application Information

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IPC IPC(8): E21B7/00E21B21/14E21B47/00E21B49/00
Inventor 孟英峰李永杰陈一健刘绘新
Owner SOUTHWEST PETROLEUM UNIV
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