Method for repeated acid fracturing of deep carbonate rock weighted foam acid

A carbonate rock, foam acid technology, applied in chemical instruments and methods, earthwork drilling, drilling composition, etc., can solve problems such as increasing conductivity

Pending Publication Date: 2021-12-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The research practice shows that the targeted temporary plugging diversion process can achieve better results. Compared with the non-carrying sand acid fracturing process, it has th

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Certain deep carbonate rock reservoir, well depth 6200 meters, (this well is a straight well, only has 1 section of acid fracturing), construction is carried out by the method provided by the present invention.

[0069] (1) According to the reservoir evaluation, the well has been in production for 22 months, the formation pressure is 0.82 of the initial stage, and the horizontal stress difference is 0.92 of the original value.

[0070] (2) Invert the construction parameters of the initial acid fracturing. After fracturing, the acid-etched seam length is 102m, and the conductivity is 45D.cm. According to the calculation based on the dynamic data of 22 months of production, the current effective seam length is only 56m. The flow capacity is 24D.cm, indicating that the acid-etched fractures are more closed.

[0071] (3) Configure aggravated cleansing foam to turn to acid, and the aggravated material is sodium chloride, sodium bromide, sodium formate, which is at 170 -1 / s ...

Embodiment 2

[0080] A certain deep carbonate rock reservoir, with a well depth of 5750 meters, is divided into 3 stages of acid fracturing, and is constructed by the method provided by the present invention.

[0081] (1) According to the reservoir evaluation, the well has been in production for 27 months, the formation pressure is 0.78 of the initial stage, and the horizontal stress difference is 0.94 of the original.

[0082] (2) Reverse the construction parameters of the first acid fracturing. After fracturing, the acid-etched seam length is 126m, and the conductivity is 37.5D.cm. According to the calculation based on the dynamic data of 27 months of production, the current effective seam length is only 64.2m , the conductivity is 22.8D.cm, indicating that acid-etched fractures have been gradually closed after long-term production.

[0083] (3) Configure aggravated cleansing foam to turn to acid, and the aggravated material is sodium chloride, sodium bromide, sodium formate, which is at ...

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Abstract

The invention discloses a method for repeated acid fracturing of deep carbonate rock weighted foam acid and application. The method comprises the steps that an alternate injection mode of low-viscosity gel acid and weighted clean foam diverting acid is adopted, a viscous fingering effect is utilized, a non-uniform etching effect is generated in a main crack and a diverting crack, and the transformation size and flow conductivity of an acid etching crack are improved. According to the method, the filtration degree of an original crack can be effectively reduced, the extension length of the crack during repeated acid fracturing is increased, the crack is promoted to divert, and the transformation range of repeated acid fracturing is further expanded.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, and furthermore, relates to a method for repeated acid fracturing with aggravated foam acid in deep carbonate rocks. Background technique [0002] At present, the proportion of deep carbonate oil and gas reservoirs is getting higher and higher, and such reservoirs are generally put into production by acid fracturing. Due to the influence of factors such as large burial depth, high reservoir temperature, and high in-situ stress, the acid-etched fractures in the first acid fracturing are short in length and low in conductivity, and the conductivity decreases rapidly. Therefore, repeated acid pressing is imperative. [0003] The current repeated acid fracturing generally still adopts the injection mode, injection parameters and acid system similar to the first acid fracturing, and the injection mode generally uses non-reactive fracturing fluid to create fractures and high-viscosity g...

Claims

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Application Information

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IPC IPC(8): E21B43/27C09K8/70C09K8/74
CPCE21B43/26E21B43/283C09K8/703C09K8/74
Inventor 蒋廷学周珺李洪春周林波李奎为沈子齐刘斌彦
Owner CHINA PETROLEUM & CHEM CORP
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