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Ultra-low-permeability oilfield selective weak gel oil displacement profile control agent

A selective and flooding agent technology, which is applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of ineffective plugging of large water outlet channels and the inability of plugging agents to enter deep formations, etc., and achieve gel formation time. control, high mineralization resistance and good thermal stability

Inactive Publication Date: 2019-03-08
陕西明德石油科技有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a selective weak gel regulating and displacing agent for ultra-low permeability oilfields, which solves the problem that existing plugging agents cannot enter deep formations through the pore-throat channels of low-permeability ultra-low-permeability reservoirs, or can enter but cannot effectively seal Problems that are not suitable for use in low-permeability reservoir formations, such as large water-out channels in the deep part of Duter low-permeability reservoir formations

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Well A21-42 of oil production S plant of a large ultra-low permeability oilfield in the central part of China was injected in August 2009, and the corresponding main direction oil well A20-41 was put into production on December 28, 2009 and saw water immediately, and well A22-43 saw water in October 2010 Shuidiguan. Before the water plugging and profile control of well A21-42, there were 199 oil wells in this block, and 39 injection wells were found, accounting for 19.6% of the total wells. Among them, there are 6 wells with oil test and water breakthrough, and 25 water-flooded wells with casing return and well closure. The average casing pressure of the casing return well is 4.5MPa, and the highest wellhead pressure reaches 7.0MPa. Tracer monitoring shows that NE72° in this area is the dominant direction of water breakthrough, and it has multi-directional water breakthrough characteristics. The highest waterline breakthrough speed is 240m / d, which shows that most of t...

Embodiment 2

[0034] Injection well H72-79 of a large ultra-low permeability oilfield in central China is located in the Triassic C 4+5 、C 6 The typical ultra-low permeability reservoir area of ​​the reservoir has tight lithology, poor reservoir physical properties and strong intra-layer heterogeneity. According to the geological data and production practice in this area, it is confirmed that the fractures in this area are relatively developed and distributed in multiple directions. Well H72-79 began injection in December 2008. The water injection wells are fracturing injection wells, corresponding to 8 oil production wells, 2 advanced water injection, and 6 delayed water injection. 3 , the daily water injection volume is 10m 3 , oil pressure 9.0Mpa, accumulative injection 22321m 3 . As of April 2013, the cumulative injection-production ratio of this well group is 0.72, and 6 wells have been flooded, and 3 wells have been geologically shut down, with a water flooding degree of 75%. The...

Embodiment 3

[0038] Well D219-49 of F Plant, a large ultra-low permeability oilfield in central China, is located in the effective water breakthrough area. The oil wells in this area are mainly porous and multi-directional water breakthrough. The well was fractured and put into production in April 2009. C8 1 1 layer, add sand 30m in the initial reconstruction 3 , sand ratio 35%, displacement 2.0m 3 / l, the daily output of pure oil is 25.5t. The daily oil production was 3.22t at the initial stage of production, and the water injection took effect in the third month, and the production gradually increased to more than 8t. From June 2011, the water content gradually increased to 70%. The liquid production of water-type sodium sulfate gradually decreased after water breakthrough. At present, the daily output Liquid 6.47m 3 , the daily oil production is only 0.28t, the water content is 95.0%, and the production capacity loss is serious.

[0039] Oil well D219-49 was treated with the above-m...

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Abstract

The invention relates to an ultra-low-permeability oilfield selective weak gel oil displacement profile control agent. The ultra-low-permeability oilfield selective weak gel oil displacement profile control agent is prepared from the following components in parts by mass: 0.1 to 1.0 part of anionic polyacrylamide, 0.01 to 0.2 part of an aluminum ion organic salt compound crosslinking agent, 0.005to 0.1 part of an organic sulfide crosslinking initiator and the balance of water, wherein the total amount of the raw materials is 100 parts. The ultra-low-permeability oilfield selective weak gel oil displacement profile control agent provided by the invention is applicable to low-permeability oil deposit strata and has high mineralization resistance, good thermal stability and controllable system gel-forming time; the ultra-low-permeability oilfield selective weak gel oil displacement profile control agent can enter deep parts of the strata through an ultra-low-permeability oil deposit pore-throat channel, can be used for effectively plugging water outlet large pore channels of the deep parts of the ultra-low-permeability oil deposit strata and has dual effects of profile control and oil displacement.

Description

technical field [0001] The invention belongs to the technical field of water plugging and profile control of oil and water wells and oil displacement in oil exploitation, and in particular relates to a weakly selective gel control and displacement agent for ultra-low permeability oilfields. Background technique [0002] With the long-term water injection development of the oilfield, the oilfield has gradually entered the medium-high water cut period. Reservoir heterogeneity is further intensified. High-permeability channels or large pores are gradually formed in the oil layer, which seriously affects the water flooding development effect of the reservoir. Water plugging and profile control plays an important role in the measures of water control, stable production and production increase in high water cut oilfields. [0003] At present, gel-type plugging agents generally have high water plugging strength and long validity period. Although they block water channels, they ar...

Claims

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Application Information

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IPC IPC(8): C09K8/588C09K8/512C09K8/88
CPCC09K8/512C09K8/588C09K8/887
Inventor 李星霈李泰余郑勇吴文超刘超张进科李曼平邱家友景晓琴尹良田周丹胡佳杰周长顺丁金岗李平李志伟吴文瑞张倩刘欣赵小光刘怡君汪霞魏姍李晗郡王宁郑妍斌魏浩旗王静栗浩竣胡杰
Owner 陕西明德石油科技有限公司
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