Underbalance well-completion tubing and gas lifting production combined method

An underbalanced, tubing technology, applied in earth-moving drilling, wellbore/well components, production fluids, etc., can solve the problem of underbalanced drilling with weakened reservoir protection effect, uplift of operation cycle, gas lift drainage or blocked production channels and other problems, to achieve the effect of maintaining the effect of productivity improvement, shortening the operation cycle, and strengthening the effect of reservoir protection.

Active Publication Date: 2013-12-25
CNPC XIBU DRILLING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a method for joint operation of underbalanced completion downhole tubing and gas lift production, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the problem of During the oil recovery process, there are problems such as gas lift drainage or unblocked production channels, operation cycle uplift and underbalanced drilling's reservoir protection effect is greatly weakened

Method used

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  • Underbalance well-completion tubing and gas lifting production combined method

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Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: The method of joint operation of underbalanced well completion downhole tubing and gas lift commissioning is carried out as follows: first step, at the bottom of the tubing string 1, the blowout prevention device 2 and The basket 3 is fixedly installed with a valve fixing seat in the blowout prevention device 2 in the oil pipe, the valve is installed in the valve fixing seat, and no less than one reverse gas lift valve 4 is fixedly installed in the middle of the oil pipe string 1, and the casing 5 The upper end is fixed on the wellhead, and the oil production spool 6 is fixedly installed on the casing 5 above the wellhead, wherein: the starting pressure of the reverse gas lift valve 4 is set to be greater than the liquid column pressure of the predetermined section to be lowered into the well; the second step, Run the tubing string 1 into the casing 5, then hang the upper end seat of the tubing string 1 in the production spool 6, and finally seal the seat...

Embodiment 2

[0019] Embodiment 2: As an optimization of the above-mentioned embodiment, the blowout prevention device 2 in the oil pipe is a valve type oil pipe floating valve device, the valve fixing seat is a valve seat, and the valve is installed in the valve seat by a torsion spring. In the third step, The poking rod is put into the tubing through the Christmas tree 7, and the poking rod pushes down the valve seat in the valve-type tubing float valve device, and the valve seat and the valve fall into the basket 3 together, and the through hole 8 on the basket 3 makes the The tubing string 1 communicates with the inside of the well so that the tubing string 1 communicates with the inside of the well to establish a production channel. The valve-type oil pipe float valve device adopts the technology in the Chinese patent document whose notification number is CN 202500534 U.

Embodiment 3

[0020] Embodiment 3: As an optimization of the above-mentioned embodiment, the blowout prevention device 2 in the oil pipe is a pressure-throwing open type oil pipe constant pressure float valve, the valve fixed seat is a valve core, and the valve is installed on the valve core. In the third step, the The pressure ball is put into the pressure-holding open type oil pipe constant pressure float valve of the pitching ball, and the ball is blocked by the pressure-holding ball to block the diversion channel of the spool in the pressure-holding open type oil pipe constant pressure float valve of the pitching ball, and the working fluid is injected into the oil pipe through the Christmas tree 7 Suppress the pressure, send the spool of the ball-suppressed open type tubing constant pressure float valve and the valve on the spool to the basket 3, and connect the tubing string 1 to the well through the through hole 8 on the basket 3 to establish a production channel. The pressure-suppr...

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Abstract

The invention relates to the technical field of underbalance well-completion practice and oil production operation, in particular to an underbalance well-completion tubing and gas lifting production combined method. The underbalance well-completion tubing and gas lifting production combined method is carried out according to the following step: a first step of sequentially and fixedly arranging an oil tube inner blowout preventer and a lifting basket at the bottom end of a tubing string from top to bottom, fixedly arranging a valve fixing seat in the oil tube inner blowout preventer, arranging a valve in the valve fixing seat, fixedly arranging at least one reverse gas lifting valve at the middle part of the tubing string and fixing the upper end of a sleeve on a wellhead. According to the invention, by fixedly arranging the oil tube inner blowout preventer at the bottom of the tubing string, not only can the tubing operation be successfully completed in the well completion stage, but also in the gas-lifting oil production process, a gas lifting drainage or production passage can be established, the gas-lifting oil production operation is successfully carried out, the operation period is shortened, a reservoir protection effect of an underbalance drilled well is reinforced and an oil / gas well can be timely put into production and is kept having an excellent capacity promoting effect, so that competitiveness of the underbalance technology is improved.

Description

technical field [0001] The invention relates to the technical field of underbalanced well completion operation and oil production operation, and relates to a method for joint operation of underbalanced well completion downhole tubing and gas lift production. Background technique [0002] At present, in wells drilled with underbalanced technology, when the tubing is run in the well completion stage, a tubing check valve and constant pressure valve are generally installed at the bottom of the tubing string to prevent the fluid in the well from ejecting from the tubing during the running of the tubing. Install a reverse gas lift valve at an appropriate position of the tubing string. After the tubing string is seated, positive circulation suppresses the pressure to open the inner channel of the tubing to realize the connection of the oil sleeve and establish a gas lift drainage or production channel. In the actual process, there is a cycle dead zone in the application process of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/00E21B33/03
Inventor 张彦龙胡挺曾权先王海波王超孙钰杰
Owner CNPC XIBU DRILLING ENG
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