Combined method of underbalanced well completion downhole tubing and gas lift commissioning

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: 2016-04-06
CNPC XIBU DRILLING ENG
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  • Abstract
  • Description
  • Claims
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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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  • Combined method of underbalanced well completion downhole tubing and gas lift commissioning

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Embodiment 1

[0018] Embodiment 1: The method of the underbalanced completion downhole tubing and gas lift combined production is carried out according to the following method: the first step, the bottom end of the tubing string 1 is fixed and installed in sequence from top to bottom. The blowout preventer 2 and Lifting basket 3, fixedly install the valve fixing seat in the blowout preventer 2 in the oil pipe, install the valve in the valve fixing seat, and install no less than one reverse gas lift valve 4 in the middle of the oil pipe string 1. 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 well section; 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 oil production spool 6, and finally seal the Christmas...

Embodiment 2

[0019] Embodiment 2: As an optimization of the above embodiment, the blowout preventer 2 in the oil pipe is a valve type oil pipe float valve device, the valve fixing seat is a valve valve seat, and the valve is installed in the valve valve seat through a torsion spring. In the third step, Throw the rod into the oil pipe through the Christmas tree 7, and the rod pushes down the valve seat in the valve type oil pipe float valve device. 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 with the publication number CN202500534U.

Embodiment 3

[0020] Embodiment 3: As an optimization of the above-mentioned embodiment, the blowout preventer 2 in the oil pipe is a fixed pressure floating valve of the oil pipe with a ball-throwing pressure and open type, the valve fixed seat is a valve core, and the valve is installed on the valve core. The pressure ball is put into the constant pressure float valve of the oil pipe constant pressure float valve of the ball-casting and pressure-holding type. Hold the pressure, send the spool of the constant pressure float valve and the valve on the spool to the lift basket 3 together, and connect the tubing string 1 with the well through the through hole 8 on the lift basket 3 to establish a production channel. The constant pressure float valve of the oil pipe with the ball-throwing pressure and open type adopts the technology in the Chinese patent document with the publication number of CN102606108A.

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Abstract

The present invention relates to underbalanced Well Operations and Production Operations In the technical field, it is a method for joint operation of underbalanced well completion downhole tubing and gas lift production, which is carried out as follows: the first step is to fixedly install the blowout preventer in the tubing and the Basket, fixedly install the valve fixing seat in the blowout prevention device in the tubing, install the valve in the valve fixing seat, and install no less than one reverse gas lift valve in the middle of the tubing string, and fix the upper end of the casing on the wellhead . The invention fixedly installs the blowout preventer in the tubing at the bottom of the tubing string, not only can successfully complete the tubing operation in the well completion stage, but also can establish a gas-lift drainage or production channel during the gas-lift production process, so that the gas-lift production The operation is carried out smoothly, the operation cycle is shortened, and the underbalanced The reservoir protection effect of drilling, oil and gas wells can be put into production in time, and maintain a good productivity improvement effect, thereby improving the competitiveness of underbalanced technologies 。

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 Patents(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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