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A low-permeability oil reservoir fracturing and completion horizontal well staged water control and acidification method

A technology for water acidification and horizontal wells, applied in chemical instruments and methods, wellbore/well components, earthwork drilling and production, etc., can solve problems such as water cut rise, extend the acidizing depth, optimize the number of water control acidizing stages, and improve the efficiency of acidizing efficiency effect

Active Publication Date: 2022-07-05
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the method for fracturing and completing horizontal wells in low-permeability oil reservoirs to control water in stages is to overcome the acidification of horizontal wells for water injection development in the prior art when the production capacity of reservoirs blocked by formation is restored by acidification In the end, it is easy to cause the seepage channel of the injected water to connect with the fractures stimulated by fracturing, which will lead to the recovery of the fluid volume of the horizontal well after acidification, but the consequence of a sharp increase in water cut

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A low-permeability oil reservoir fracturing and completion horizontal well staged water control and acidification method, comprising the following steps:

[0038] 1) According to the initial stimulation parameters, production performance parameters and water breakthrough plugging parameters of horizontal wells in low-permeability reservoirs, water control and acidification operation parameters are determined;

[0039] The primary reconstruction parameters include the number of primary reconstruction sections and the perforation position of the acidified layer section;

[0040] Production dynamic parameters include construction displacement, sand addition, initial daily liquid production, initial daily oil production, initial water content, and initial dynamic liquid surface area;

[0041] The parameters of water breakthrough plugging include daily liquid production after formation plugging, daily oil production after formation plugging, water content after formation plu...

Embodiment 2

[0049] A low-permeability oil reservoir fracturing and completion horizontal well staged water control and acidification method, comprising the following steps:

[0050] 1) According to the initial stimulation parameters, production performance parameters and water breakthrough plugging parameters of horizontal wells in low-permeability reservoirs, water control and acidification operation parameters are determined;

[0051] The primary reconstruction parameters include the number of primary reconstruction sections and the perforation position of the acidified layer section;

[0052]Production dynamic parameters include construction displacement, sand addition, initial daily liquid production, initial daily oil production, initial water content, and initial dynamic liquid surface area;

[0053] The parameters of water breakthrough plugging include daily liquid production after formation plugging, daily oil production after formation plugging, water content after formation plug...

Embodiment 3

[0072] A low-permeability oil reservoir fracturing and completion horizontal well staged water control and acidification method, comprising the following steps:

[0073] 1) The parameters of the initial stimulation of horizontal wells: 9 sections of the initial stimulation, the depth of the injection point is between 2100-3000m;

[0074] Production dynamic parameters: construction displacement 2.0-2.2m 3 / min, the sand addition volume is 25.0-40.0 cubic meters per section, corresponding to 5 water injection wells, and the initial daily liquid production volume is 14.5m 3 / d, the initial daily oil production is 9.7t / d, the initial water content is 12.7%, and the initial dynamic liquid surface area is 479m;

[0075] Water breakthrough plugging parameters: After water breakthrough plugging, the daily liquid production is 2.5m after formation plugging 3 / d, the daily oil production after formation plugging is 0.2t / d, the water content after formation plugging is 91.0%, and the d...

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Abstract

The invention belongs to the technical field of fracturing and acidizing of horizontal wells in oil fields, and specifically provides a staged water control and acidification method for fracturing and completing horizontal wells in low-permeability oil reservoirs. Controlling the rise of water cut after acidification in horizontal wells has achieved good results. The tool for staged water control and acidification in horizontal wells adopts multi-stage sliding sleeve water control acidification pipe string. The ball seat, K344 packer, and Φ73mm chamfering tool and tubing are combined to realize the staged water control and acidification construction of the horizontal well without moving the string. During staged construction, the pre-fluid is injected first, the formation is pre-flushed and the formation energy is replenished. Then inject the liquid slug to change the phase permeability, inject the isolation fluid, and finally inject the acid fluid. After the construction is completed, the well is shut in for 2 hours, and the well is released, backwashed, and production resumed. construction efficiency.

Description

technical field [0001] The invention belongs to the technical field of fracturing and acidizing of horizontal wells in oil fields, and in particular relates to a method for water control and acidizing of low-permeability oil reservoirs by fracturing and completing horizontal wells. Background technique [0002] In order to efficiently develop low-permeability oil reservoirs, horizontal well development is generally used. At the same time, the target oil layer is fracturing and the formation energy is supplemented by water injection, which effectively suppresses the decline in production. However, as the water injection takes effect, the injected water is not compatible with the physical properties of the formation. , causing formation damage, leading to formation blockage, resulting in a decrease in oil production. For reservoirs with formation plugging, acidification is generally used to restore productivity. However, for horizontal wells developed by water injection, acidi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/27C09K8/74C09K8/52C09K8/40C09K8/68
CPCE21B43/26C09K8/74C09K8/52C09K8/40C09K8/68C09K8/885C09K8/882C09K2208/12
Inventor 杨立安张矿生李建山卜向前齐银何衡黄婷顾燕凌康博李建辉
Owner PETROCHINA CO LTD