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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: 2014-02-26
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 TK1078 well in Tahe Oilfield

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

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

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

Embodiment 2

[0088] The First Acid Fracturing Construction and Effect of Well TH12137

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

[0090] Linear glue: use the fracturing fluid product of model JXG-T sold by the HB-YL201 fracturing team of the North China Petroleum Bureau's downhole operation team. Hydroxypropyl Trimethylammonium 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] Jelly: the above-mentioned linear glue + OB-YS organic boron cross-linking agent sold by Xinjiang Luntai Like Oilfield Technical Service Co., Ltd., the cross-linking ratio is 100:0.6 (volume ratio of the above-mentioned linear glue and cross-linking agent).

[0092] Gelling acid: adopt the gelling acid product of model CT-S sold by Beijing Camtech Pe...

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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 an ultra-deep fracture-cavity carbonate reservoir. Background technique [0002] Carbonate reservoir is one of the important oil and gas reservoirs. Abroad, since the mid-1970s, indoor research and field tests on clean water fracturing have been carried out, and experienced clean water fracturing without proppant, conventional clean water fracturing, and mixed clean water fracturing (Wang Subing, Summary 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. It is one of the important production stimulation measures for carbonate reservoir stimulation. With the in-depth development of carbo...

Claims

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Application Information

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Patent Type & Authority Patents(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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