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Method for controlling underground sliding sleeves by ground pressure waves

A ground control and pressure wave technology, which is applied in wellbore/well valve device, earthwork drilling, wellbore/well components, etc. Conducive to post-production, low cost, time-saving effect

Active Publication Date: 2014-10-08
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with similar foreign products, this type of sliding sleeve does not have the function of closing later
And the existing pitching sleeve operation needs to wait for the time it takes for the ground to drop the ball to the sliding sleeve ball seat, which is poor in timeliness

Method used

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  • Method for controlling underground sliding sleeves by ground pressure waves
  • Method for controlling underground sliding sleeves by ground pressure waves
  • Method for controlling underground sliding sleeves by ground pressure waves

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] A method for controlling a downhole sliding sleeve by surface pressure waves, comprising the steps of:

[0052] a. Multiple sliding sleeves are connected to the completion string at the same time, and each sliding sleeve is assigned different command information to run into the well;

[0053] b. Regularly adjust the displacement of surface pumps to make the downhole pressure change according to the same law, that is, to transmit the pressure fluctuation signal containing control instructions to the downhole;

[0054] c. The receiving device installed on each sliding sleeve receives the ground control command and compares it with the command information assigned by itself;

[0055] d. If the ground control command is different from the command information assigned inside the sliding sleeve, the sliding sleeve will not act and continue to wait for the next ground control command;

[0056] e. If the ground control command is the same as the command information distributed...

Embodiment 2

[0082] The invention is divided into two parts: a surface control part and a downhole execution part. The ground control part is the fracturing train unit; the downhole part is the executive part, which is an electronically controlled switchable sliding sleeve. In order to meet the needs of the current staged fracturing and acidizing process for horizontal wells, usually, multiple electrically controlled switchable sliding sleeves are connected to the completion string of a well at the same time, and they are lowered into the well together. Different instruction information is assigned, and when the ground fracturing crew adjusts the surface pumping displacement according to a certain law, the downhole pressure will also change according to the same law, that is, pressure fluctuations containing control instructions are transmitted downhole. The pressure sensor installed on each sliding sleeve receives the ground control command and compares it with the command information ass...

Embodiment 3

[0086] In this embodiment, the switch control of the sliding sleeve is described in detail as follows:

[0087] Switch sliding sleeve closed state:

[0088] Start the motor 9 according to the control signal, and the two-position three-way electromagnetic reversing valve 5 is in a power-off state and is in the lower position; the high-pressure oil enters the lower oil passage 18 through the second two-position two-way electromagnetic reversing valve 7 and the lower circuit, and pushes the valve. 22 moves upwards, the first two-position two-way electromagnetic reversing valve 6 is electrified, and when valve 22 moves upward, the hydraulic oil in the upper oil passage is pushed along the upper circuit, and returns to the oil tank 3 through the first two-position two-way electromagnetic valve 6, The sliding sleeve is closed. The upper space of the upper piston 2 on the fuel tank 3 communicates with the external environment pressure, thereby keeping the pressure in the fuel tank 3...

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Abstract

The invention discloses a method for controlling underground sliding sleeves by ground pressure waves. The method comprises the steps as follows: the ground pumping displacement is adjusted regularly to enable underground pressure to change according to the same rule, that is, a pressure fluctuation signal comprising a control command is transmitted to the underground; a receiving device arranged on each sliding sleeve receives the ground control command, and the ground control command is compared with command information assigned by the sliding sleeve; if the ground control command is different from the command information assigned in each sliding sleeve, the sliding sleeve does not act and waits for a next ground control command; and if the ground control command is the same as the command information assigned in each sliding sleeve, the sliding sleeve acts and finishes the opening or closing operation required by the control command. According to the method for controlling the underground sliding sleeves by the ground pressure waves, the underground pressure changes regularly according to regular adjustment of the ground pumping displacement, opening and closing actions of the underground sliding sleeves are remotely controlled by recognizing the signals transmitted through regular pressure change, and opening and closing of the sliding sleeves can be controlled in real time.

Description

technical field [0001] The invention relates to a method for controlling downhole sliding sleeves by surface pressure waves, which is used for staged fracturing and acidification reconstruction of horizontal wells, and belongs to the technical field of well completion reconstruction used in petroleum exploitation. Background technique [0002] As a downhole tool that can communicate / isolate oil and gas wells and formation fluids, sliding sleeves are currently widely used in staged fracturing and acidizing strings for horizontal wells. At present, the staged fracturing and acidification of horizontal wells in oilfields adopts mechanical ball-throwing sliding sleeves. To open each level of sliding sleeves, fracturing balls of corresponding sizes need to be dropped. The inner diameter of the sliding sleeve ball seat and the fracturing ball are different. From the bottom to the top, the inner diameter of the sliding sleeve ball seat and the fracturing ball increases step by step...

Claims

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Application Information

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IPC IPC(8): E21B34/16E21B34/14E21B43/26
Inventor 石磊钟兴久钱斌唐欣
Owner BC P INC CHINA NAT PETROLEUM CORP
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