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Method of cold water fracturing

A fracturing and cold water technology, which is applied in the fields of earthwork drilling, isolation devices, and production fluids, etc., can solve the problems of few combination methods and weak research, so as to increase the destruction efficiency, facilitate cracking, and prevent cracks from closing. Effect

Inactive Publication Date: 2019-06-14
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Since the development of hydraulic fracturing, great progress has been made in the interaction between solid and fluid, but the research under multi-field coupling is relatively weak, and there are very few methods for combining multiple rock breaking methods.

Method used

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  • Method of cold water fracturing

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A kind of cold water fracturing method provided by the present invention comprises the following steps:

[0026] S1. Prepare fracturing fluid: choose a fracturing fluid that has no solid matter precipitated at 4°C and has a stable colloidal structure;

[0027] S2. Lowering the temperature of the fracturing fluid: add crushed ice cubes with a particle size of 1 cm to the fracturing fluid in step S1 for cooling treatment, and control the temperature of the fracturing fluid to 4° C.;

[0028] S3. Formal fracturing: Formal fracturing is to pump the prepared fracturing fluid from the wellhead into the target reservoir position to be fractured through a high-pressure water pump, and then increase the pump pressure to make the pump pressure reach above the fracture pressure of the reservoir rock. until the rock is broken;

[0029] S4, bored well: the temperature of the fracturing fluid to be injected into the formation does not change, and the fracturing fluid is recovered. ...

Embodiment 2

[0031] A kind of cold water fracturing method provided by the present invention comprises the following steps:

[0032] S1. Prepare the fracturing fluid: choose a fracturing fluid that has no solid matter precipitated at 2°C and has a stable colloidal structure;

[0033] S2. Lowering the temperature of the fracturing fluid: add crushed ice cubes with a particle size of 0.5 cm to the fracturing fluid in step S1 for cooling treatment, and control the temperature of the fracturing fluid to 2° C.;

[0034] S3. Formal fracturing: Formal fracturing is to pump the prepared fracturing fluid from the wellhead into the target reservoir position to be fractured through a high-pressure water pump, and then increase the pump pressure to make the pump pressure reach above the fracture pressure of the reservoir rock. until the rock is broken;

[0035] S4, boring well: after the temperature of the fracturing fluid injected into the formation no longer changes, the fracturing fluid is recover...

Embodiment 3

[0038] A kind of cold water fracturing method provided by the present invention comprises the following steps:

[0039] S1. Prepare fracturing fluid: choose fracturing fluid with stable colloidal structure and no solid matter precipitated at 5°C;

[0040] S2. Lowering the temperature of the fracturing fluid: add crushed ice cubes with a particle size of 2 cm to the fracturing fluid in step S1 for cooling treatment, and control the temperature of the fracturing fluid to 5° C.;

[0041] S3. Formal fracturing: Formal fracturing is to pump the prepared fracturing fluid from the wellhead into the target reservoir position to be fractured through a high-pressure water pump, and then increase the pump pressure to make the pump pressure reach above the fracture pressure of the reservoir rock. until the rock is broken;

[0042] S4, boring well: after the temperature of the fracturing fluid injected into the formation no longer changes, the fracturing fluid is recovered.

[0043] The ...

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Abstract

The invention discloses a method of cold water fracturing, and belongs to the technical field of oil-gas well engineering. The method of cold water fracturing comprises the steps that S1, fracturing liquid is prepared, specifically, the fracturing liquid which has no precipitation of solid materials in the state of 1-5 DEG C and with a stable colloid structure is selected; S2, the temperature of the fracturing liquid is lowered, specifically, ice blocks are added into the fracturing liquid in the S1 so that temperature cooling treatment can be conducted; S3, formal fracturing is conducted; andS4, well covering is conducted, specifically, the fracturing liquid is poured into a stratum, after the fracturing liquid temperature does not change, fracture liquid is recycled. According to the method of the cold water fracturing, improvement is conducted in terms of water power fracture, the influence of temperature on racks are brought into traditional water power fracture, the fracture is conducted through the cold water, the rocks are in the action of solid flow mechanics and are further subjected to congelation damage, crack tip stress and the rock inner stress supplement each other to reach the effect of optimization of rock breaking.

Description

technical field [0001] The invention relates to the technical field of oil and gas well engineering, in particular to a cold water fracturing method. Background technique [0002] In oil and gas extraction, some reservoirs are very tight, and the oil and gas stored in rocks are difficult to flow and exploit. Therefore, for such reservoirs, reservoir stimulation is often required, and hydraulic fracturing is the most widely used method of reservoir stimulation. Hydraulic fracturing is to pump fracturing fluid into the target reservoir and apply pressure. The fracturing fluid acts on the rock in the reservoir, causing the rock to break and produce a large number of cracks, providing flow channels for the oil and gas stored in the rock, and helping the oil and gas flow smoothly. mining. [0003] Although hydraulic fracturing has been widely used, the effect of hydraulic fracturing has not been fully exploited, and the exploration and optimization of hydraulic fracturing is sti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B36/00
Inventor 温航姜兴文
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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