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Method for replacing filling layer without changing pipe string, flowback service device and well completion structure

A pipe string flowback and service device technology, which is applied in the direction of earthwork drilling, wellbore flushing, wellbore/well components, etc. Problems such as the decline in daily fluid production capacity of oil wells, to achieve the effects of prolonging normal production time, shortening operation time, reducing costs and stopping production

Active Publication Date: 2019-11-08
ANTON BAILIN OILFIELD TECH (BEIJING) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, for many oil and gas wells, especially those in unconsolidated sandstone reservoirs, after a period of production using the continuous packer segmental flow control technology, due to geological reasons, the formation fluid will carry some impurities (such as mud fine grains, such as sandy or sandy grains, etc.) are produced together, and the impurities are blocked in the seepage pores between the packing particles, and the seepage pores are blocked, thereby reducing the oil-water passage rate and ultimately reducing the daily fluid production capacity of the oil well. dramatically drop
Aiming at this problem, the conventional solution is to acidify the impurities. However, the acidizing process is complex and costly, especially the maintenance time is very short, usually only ten days to one or two months, which cannot effectively meet the continuous production operations of oil wells. requirements

Method used

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  • Method for replacing filling layer without changing pipe string, flowback service device and well completion structure
  • Method for replacing filling layer without changing pipe string, flowback service device and well completion structure
  • Method for replacing filling layer without changing pipe string, flowback service device and well completion structure

Examples

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Effect test

Embodiment 1

[0032] against figure 1 with figure 2 With the well completion structure shown, this embodiment provides a method for flowback of the downhole pipe string and replacement of the downhole isolation particle packing layer without changing the downhole string, including the following steps:

[0033] (1) Open the sliding sleeve 21 of the sliding sleeve filling tool to establish a flowback channel; the path of the flowback channel is in the order of the flow direction of the flowback liquid: feeding pipe string, flow control screen, flow control screen Annulus A between the casing and the well wall, the filling hole 20 of the sliding sleeve packing tool, and the outer annulus C between the feeding pipe string and the well wall.

[0034] The specific method of opening the sliding sleeve 21 of the sliding sleeve filling tool is as follows: (1.1) The flowback service device 10 used in conjunction with the sliding sleeve filling tool is lowered through the feeding pipe string, (1.2) ...

Embodiment 2

[0042] This embodiment presents a specific structure of a flowback service device 10 that is applied to the method described in Embodiment 1 and is used for flowback of the downhole pipe string and replacement of the downhole isolation particle packing layer.

[0043] Such as Figure 5 As shown, the flowback service device 10 has a lumen-like structure as a whole, a liquid outlet channel 16 is provided at the front end, and a connecting device for connecting the flowback column is provided at the rear end, and the liquid outlet channel 16 and For the cavity 13 of the flowback column, the connecting device adopts a conventional sealing thread connection method. Specifically, the liquid outlet channel 16 is an open structure (that is, the front end is directly the open end of the cavity), a porous structure (similar to a shower head-shaped porous structure), or a plurality of slit structures (along the top of the flowback service device). A plurality of strip-shaped slits provi...

Embodiment 3

[0049] This example provides a well completion structure that does not change the flowback of the downhole pipe string and replaces the downhole packing layer of packing particles. The device described in Example 2 can be used to realize the sealing of packing layer packing particles according to the method described in Example 1. Flowback and replacement.

[0050] Such as image 3 with Figure 4 As shown, a completion structure that can not change the downhole string flowback and replace the downhole packing particle packing layer, the completion is an open hole or a perforated cased Hole wall of a wellbore in a cased well. The annulus between the downhole pipe string and the well wall is provided with a packing layer filled with packing particles, and the heel end of the downhole pipe string is provided with a sliding-sleeve packing tool; the wellbore is provided with the The flowback service device 10.

[0051] Preferably, the downhole pipe string is a flow control scre...

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Abstract

The invention relates to a method for replacing a down-hole packer particle filling layer without changing the down-hole pipe string flowback. The filling layer filled with packer particles are arranged in an annulus between a down-hole pipe string and the borehole wall, and a sliding sleeve type filling tool is arranged at the heel end of the down-hole pipe string. The method includes the following steps that a sliding sleeve of the sliding sleeve type filling tool is opened, and a flowback channel is established; and flowback fluid is injected into the down-hole pipe string through a feedingpipe string, the flowback fluid enters the annulus through a flow control device of the down-hole pipe string, the packer particles carried in the annulus are discharged from a wellhead through a filling hole and an oil jacket annulus, and after the flowback, the packer particles are then filled. According to the method, traditional down-hole packer and flow control screen pipe string salvage operation is avoided, the blocking relieving efficiency is improved, meanwhile the blocking relieving purpose is also achieved, the workover treatment time is shortened, and the cost caused by the workover and the loss caused by suspend production are reduced.

Description

technical field [0001] The invention belongs to the technical field of petroleum and natural gas exploitation, and relates to a method for maintaining flowback of a downhole pipe string and replacing a downhole packing particle packing layer, and a method for changing backhole pipe string flowback and replacing a downhole packing particle packing layer The flowback service device, and a well completion structure that can not change the flowback of the downhole string and replace the downhole isolation particle packing layer. Background technique [0002] There are a large number of unconsolidated sandstone reservoirs that are prone to sand production in global oil and gas fields. For oil and gas wells in unconsolidated sandstone reservoirs, whether they are vertical wells, inclined wells or horizontal wells, sand production is one of the problems often encountered in oilfield development. The harm of sand production in oil wells is relatively large, which will cause a large ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B21/12E21B43/04
CPCE21B21/12E21B43/04
Inventor 裴柏林冯国江
Owner ANTON BAILIN OILFIELD TECH (BEIJING) CO LTD