One-trip tubing string separate-injection coproduction method for thick oil thermal recovery well

A heavy oil thermal recovery and pipe string technology, which is applied in the direction of production fluid, earth drilling, wellbore/well components, etc., can solve the problems of long production cycle, etc., and achieve the effect of convenient construction and operation, novel structure and effective utilization

Active Publication Date: 2012-07-11
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Overcoming the shortcoming of waiting for the wellhead temperature to drop after steam injection, and then pumping down the pump to implement long production cycle

Method used

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  • One-trip tubing string separate-injection coproduction method for thick oil thermal recovery well
  • One-trip tubing string separate-injection coproduction method for thick oil thermal recovery well
  • One-trip tubing string separate-injection coproduction method for thick oil thermal recovery well

Examples

Experimental program
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Effect test

Embodiment 1

[0023] One-pass separate injection and combined production method for heavy oil thermal recovery wells,

[0024] Step A: See figure 1 . Run the separate injection and combined production string into the casing 9 of the heavy oil thermal recovery well; The lower end of the layered steam injection sleeve 6 is connected to the lower end of the layered steam injection sleeve 6, and the lower end of the layered steam injection sleeve 6 is connected to the thermal recovery packer 7, and the lower end of the thermal recovery packer 7 is connected to the lower oil pipe 8; the thermal recovery packer 7 is seated on the On the inner wall of the casing 9, the position of the thermal recovery packer 7 is between the upper oil layer and the lower oil layer; the positions on the wall of the casing 9 corresponding to the upper oil layer and the lower oil layer have holes shot out by perforating guns respectively.

[0025] Step B: Lower the sucker rod string. The structure of the sucker ro...

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Abstract

The invention relates to a one-trip tubing string separate-injection coproduction method for a thick oil thermal recovery well. The one-trip tubing string separate-injection coproduction method is applied to the coproduction of the thick oil of an oilfield after the layered injection of steam. The method comprises the following steps of: tripping a separate-injection coproduction tubing string into a sleeve for the thick oil thermal recovery well; tripping in an oil pumping rod string; after a packing seal box is fixed on a wellhead device, injecting overheated steam into a lower oil layer; after finishing the injection of the overheated steam into the lower oil layer, downward conveying an oil-pumping rod by using an oil-pumping machine, wherein the oil-pumping rod downward slides to push a steel ball in a layered steam injection sliding sleeve to be located at the top of the sliding sleeve; and pressurizing the sliding sleeve to downwardly slide from a wellhead, closing a lower steam injection passage, and opening a steam injection passage of an upper oil layer. According to the one-trip tubing string separate-injection coproduction method for the thick oil thermal recovery well, the construction operation is convenient, tools are fully tripped in the thick oil thermal recovery well through a one-trip tubing string, and a pump is tripped in before the steam is injected, so that the time delay and the loss of steam heat, caused by the waiting for the decrease of the temperature at the wellhead, after the steam is injected are avoided, and the construction is safe and reliable.

Description

technical field [0001] The invention relates to a separate injection and combined production process for thick oil wells in oil fields, and is a separate injection and combined production method for one-pass tubular string of heavy oil thermal recovery wells. Background technique [0002] At present, there are various structures of separate injection and production strings in domestic oilfields. One structure is composed of thermal recovery packers and sliding sleeves. During steam injection, steam can only be injected sequentially from bottom to top, and it is necessary to wait for the stuffy well to end. The wellhead pump can only be driven when the wellhead temperature drops, which not only reduces the heat utilization rate of the steam, but also increases the construction time and construction cost. At present, the ball feeders used in domestic oil fields are all ground ball feeders, and the pump cannot be directly lowered into the well, so after steam injection, the pum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/00E21B43/24E21B43/14E21B34/06
Inventor 李璐黄新业赵文龙张立义张茹
Owner PETROCHINA CO LTD
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