Large composite acid fracturing method of fracture cave type carbonate rock reservoir

A carbonate rock reservoir and compound acid fracturing technology, which is applied in earth-moving drilling, production of fluids, wellbore/well components, etc. The effect of improving the flow capacity and increasing the length of the seam

Active Publication Date: 2011-04-20
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Ordovician fractured-cavity carbonatite reservoirs have serious horizontal and vertical heterogeneity, poor continuity of reservoirs on the plane, and a large number of disconnected constant-volume reservoirs, resulting in low overall recovery
During conventional acid fracturing, this type of well can only communicate with the nearest fractured-vuggy reservoir within 120m from the wellbore in the direction of the maximum horizontal principal stress. According to the tracking statistics of acid fracturing in the oil field, there are problems of rapid production decline and short validity period after fracturing. question

Method used

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  • Large composite acid fracturing method of fracture cave type carbonate rock reservoir
  • Large composite acid fracturing method of fracture cave type carbonate rock reservoir
  • Large composite acid fracturing method of fracture cave type carbonate rock reservoir

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] The first acid fracturing operation of Well TK1078 in Tahe Oilfield

[0067] The composition of the liquid involved in the first acid fracturing process is as follows. The following percentages, unless otherwise specified, refer to mass%.

[0068] Linear glue: use the fracturing fluid product model TH-HPG sold by Tuha Downhole Technology Operation Company. Its composition is: 20% HCl+0.5% HPG guar (guar hydroxypropyl trimethyl ammonium chloride) +1.0%LZ-1 drainage aid+1.0%LP-1 demulsifier+0.1%LK-7 fungicide+0.02%PH value regulator+0.5%LK-6 temperature stabilizer+1.0%LK-8 clay stabilizer , The rest is water. Among them, guar gum is usually guar hydroxypropyltrimethylammonium chloride.

[0069] Gel: the above linear glue + LK-9 organic boron crosslinking agent sold by Xinjiang Luntai Like Oilfield Technical Service Co., Ltd. The crosslinking ratio is 100:0.6 (this is the volume ratio of the above linear glue and crosslinking agent) .

[0070] Gelling acid: The gelling acid pro...

Embodiment 2

[0088] The first acid fracturing operation and its effect on TH12137 well

[0089] The composition of the liquid involved in the first acid fracturing process is as follows. The following percentages, unless otherwise specified, refer to mass%.

[0090] Linear glue: The fracturing fluid product model JXG-T sold by the HB-YL201 fracturing team of the North China Petroleum Bureau Downhole Operation Team is used. Its composition is: 20% HCl+0.5% JXG-T Guar Gum (Special Grade) (Guar Gum hydroxypropyl trimethyl ammonium chloride) + 0.02% PH value regulator + 1.0% HS-308 demulsifier + 1.0% ZH-5 drainage aid + 0.5% SRD-Y temperature stabilizer + 1.0% SNW-Y Clay stabilizer, the rest is water.

[0091] Gel: the above linear glue + OB-YS organic boron crosslinking agent sold by Xinjiang Luntai Like Oilfield Technical Service Co., Ltd., the crosslinking ratio is 100:0.6 (the volume ratio of the above linear glue and the crosslinking agent).

[0092] Gelling acid: The gelling acid product model ...

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Abstract

The invention relates to a large composite acid fracturing method of a fracture cave type carbonate rock reservoir. The method is characterized by comprising the following steps of while communicating a plurality of fracture caves on the periphery of a shaft of the reservoir: (1) filling quick water into the stratum through the oil pipe of the mixed filling with the oil sleeve; (2) adding powdered ceramic to the stratum through the oil pipe; (3) filling acid liquid into the stratum through the oil pipe for the first time; (4) filling acid liquid into the stratum through the oil pipe for the second time; and (5) filling excess displacing liquid through the oil pipe or the mixed filling with the oil sleeve, wherein the large composite acid fracturing method indicates that the total construction liquid quantity is more than 2,000m<3>. The invention improves the length of an artificial acid fracturing fracture to reach longer than 140m and solves the problem that a conventional acid fracturing technology of a fracture cave type carbonate rock reservoir within the range of 200m of the shaft cannot communicate a far-shaft reservoir, and a new fracture cave reservoir is needed to be searched through side tracking.

Description

Technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a large-scale composite acid fracturing technology for ultra-deep fracture-cavity carbonate reservoirs. Background technique [0002] Carbonate reservoir is one of the important oil and gas reservoirs. Foreign countries began to conduct clean water fracturing indoor research and field tests in the mid-1970s, and experienced clean water fracturing without proppant, conventional clean water fracturing, mixed clean water fracturing (Wang Subing, Overview of clean water fracturing technology, natural gas exploration and development , 2005, 28(4): 39-42). In addition, acid fracturing restores and improves the permeability of the formation through the dissolution of acid, and improves the productivity of oil and gas wells, which is one of the important production stimulation measures for carbonate reservoir reconstruction. With the in-depth development of carbonate r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/27
Inventor 林涛张烨耿宇迪米强波胡国亮张宁杨敏张义胡雅洁张泽兰赵文娜焦克波李春月黄燕飞张俊江刘雄波杨方政
Owner CHINA PETROLEUM & CHEM CORP
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