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Method for increasing effective length and time of deep high-temperature carbonate rock cracks

A technology of carbonate rock and effective length, which is applied in the direction of earthwork drilling, mining fluid, wellbore/well components, etc., which can solve the problems of acid-etched effective fracture length, unfavorable fracture validity period, and easy rapid disappearance, so as to avoid excessive Dissolution effect, effect of improving conductivity

Active Publication Date: 2021-01-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] To sum up, the conductivity of acid-etched fractures tends to disappear quickly near the wellbore and at the end of the fracture, which is extremely unfavorable for increasing the effective fracture length and effective life of acid-etched fractures.

Method used

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  • Method for increasing effective length and time of deep high-temperature carbonate rock cracks
  • Method for increasing effective length and time of deep high-temperature carbonate rock cracks
  • Method for increasing effective length and time of deep high-temperature carbonate rock cracks

Examples

Experimental program
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Effect test

Embodiment 1

[0067] A well is 6,650 meters deep, and the formation temperature is 162 degrees Celsius. Use high temperature resistant polymer fracturing fluid to create fractures, the liquid is 160 degrees Celsius 170S -1 The tail sticks at 110mPa.s after shearing for 2 hours.

[0068] (1) A total of 400 cubic meters of fracturing fluid was pumped, with a displacement of 7 cubic meters per minute, and the length of hydraulic fractures opened in the formation was 145 meters.

[0069] (2) Pump fracturing fluid and add 60 square meters of 100-170 mesh solid acid particles in a slug manner, and the volume ratio (ie, the concentration of solid particles) is (8~10)-(14~15)-(10~12)- (15~16)%, spacer fluid between slugs is 10m 3 , use 350 square meters of fracturing fluid. Among them, the concentration in the first stage is gradually increased from 8% to 10%, the concentration in the second stage is gradually increased from 14% to 15%, the concentration in the third stage is gradually increased...

Embodiment 2

[0075] A well is 6642 meters deep, and the formation temperature is 162 degrees Celsius. Use high temperature resistant polymer fracturing fluid to create fractures, the liquid is 160 degrees Celsius 170S -1 After 2 hours of shearing, the tail sticks at 120mPa.s.

[0076] (1) A total of 400 cubic meters of fracturing fluid was pumped, with a displacement of 7 cubic meters per minute, and the length of hydraulic fractures opened in the formation was 145 meters.

[0077] (2) Pump fracturing fluid and add 60 square meters of 80-200 mesh solid acid particles, and the volume ratio (ie, the concentration of solid particles) is (10~12)-(15~18)-(12~13)- (18~20)%, spacer fluid between slugs is 10m 3 , use 330 square meters of fracturing fluid. Among them, the concentration of the first stage is gradually increased from 10% to 12%, the concentration of the second stage is gradually increased from 15% to 18%, the concentration of the third stage is gradually increased from 12% to 13%,...

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Abstract

The invention discloses a method for increasing the effective length of deep high-temperature carbonate rock cracks. The method comprises the following steps that (1) front fracturing fluid is injected; (2) carrying liquid wrapped with solid acid particles are injected; (3) fracturing fluid carrying a propping agent is injected; (4) low-viscosity acid is injected; (5) displacement operation is carried out; and (6) flowback after pressing, testing and production are carried out. According to the method, after fracturing is completed, far-well cracks are wrapped with acid liquor to be etched toform the flow conductivity, the near-well crack propping agent supports and maintains the flow conductivity, and therefore high-flow-conductivity cracks under high closing stress are formed.

Description

technical field [0001] The invention relates to the field of oil field development, in particular to a method for increasing production in oil field development, in particular to a method for increasing the effective length and time of fractures in deep high-temperature carbonate rocks. Background technique [0002] Carbonate oil and gas reservoirs are widely distributed and have huge resources. In order to increase the production of oil and gas wells, pre-fluid acid fracturing technology is often used, that is, first pumping fracturing fluid into the formation at high pressure to open an artificial fracture, and then injecting acid at high pressure to utilize the chemical reaction between rock and acid , etch the crack surface. Due to the non-uniform etching, after the fracture is closed, it still has a certain conductivity, so as to achieve the purpose of increasing production. [0003] At present, the proportion of discovered high-temperature carbonate rock reserves in ...

Claims

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Application Information

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IPC IPC(8): E21B43/267E21B43/27
CPCE21B43/267E21B43/26
Inventor 蒋廷学周林波刘红磊周珺贾文峰侯磊李奎为李洪春
Owner CHINA PETROLEUM & CHEM CORP