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Horizontal well refracturing method

A technology for re-fracturing and horizontal wells, which is used in earth-moving drilling, wellbore/well components, and production fluids. problems, to achieve the effect of improving work efficiency and increasing production.

Inactive Publication Date: 2018-01-19
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its advantage is that it can restore the original wellbore, and repeated fracturing can realize precise control of fractures. Technical disadvantages: the downhole tools of the expansion tube are complicated, the technology is difficult, and the operation risk is high
Its advantage is that it can seal the original fractures and perforation holes, and repeated fracturing can realize precise control of fractures. Technical disadvantages: the secondary cementing technology is difficult to control, and the risk of cementing and plugging operations is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] This embodiment provides a horizontal well refracturing method, comprising the following steps:

[0027] Step 1) Clean up the old wellbore of the horizontal well completed by casing cementing;

[0028] Step 2) Run the tubing in the casing;

[0029] Step 3) Pump active water in the tubing and casing annulus to test the leakage of the old wellbore to ensure the normal establishment of circulation;

[0030] Step 4) Inject temporary plugging agent in the tubing and casing annulus, and seal the tubing annulus in the horizontal section;

[0031] Step 5) After the pumping operation is completed, the tubing and casing gates are closed, the well is shut down and waits for solidification, and then the tubing is pressure tested;

[0032] Step 6) After the tubing pressure test is qualified, repeat fracturing in the first section of the horizontal well in the tubing, and then use bridge plug and perforation combined technology to perform interstage isolation and stage fracturing a...

Embodiment 2

[0036] On the basis of Example 1, this embodiment provides a horizontal well refracturing method, specifically a refracturing method in which the oil casing annular space of a horizontal well is temporarily plugged and sealed together with a small-diameter bridge plug.

[0037] The difference between the outer diameter of the tubing and the inner diameter of the casing in step 2) is 30-40mm. In order to ensure the sealing effect of the annulus, the optimal size when selecting the oil pipe is: the oil-casing annulus gap is 15~20mm, that is, the difference between the outer diameter of the oil pipe and the inner diameter of the original casing is 30~40mm, and at the same time, the internal pressure resistance is greater than Under the condition of 70MPa, the economical and applicable steel grade and wall thickness of the casing were selected; in order to ensure that the tubing was centered, a first-stage centralizer was run in every 2~3 tubing; The bottom of the tubing is connec...

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Abstract

The invention provides a horizontal well refracturing method. The effects of sealing and cementing an oil pit shaft of a horizontal well, temporarily building a fire-new pit shaft, building a refracturing passage and freely selecting a repeated transformation layer section according to the oil reservoir engineering requirements can be realized; the process goal of precisely controlling the repeated transformation of artificial cracks can be achieved; and the operation efficiency of the repeated transformation and the production increase effect can be improved.

Description

technical field [0001] The invention belongs to the technical field of oil production engineering, and in particular relates to a method for repeated fracturing of a horizontal well. Background technique [0002] In recent years, horizontal well drilling and staged fracturing have become effective ways to increase single well production in tight reservoirs. With the gradual deepening of development, the number of low-yield horizontal wells increases year by year, and repeated fracturing is required to restore the single-well production and improve the development effect. Horizontal well refracturing technology is the key technical bottleneck to ensure the effect of measures. At present, horizontal well refracturing technology at home and abroad mainly includes three types: [0003] The first is temporary plugging and diversion fracturing technology, which uses diverting agent for temporary plugging fracturing. The diverting agent blocks perforation holes, and the liquid is ...

Claims

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Application Information

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IPC IPC(8): E21B43/26
Inventor 郭小勇赵振峰张矿生李宪文王文雄李志文曹宗熊白晓虎山树民王蓓王泫懿
Owner PETROCHINA CO LTD
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