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Low damage carboxymethyl hydroxypropyl guanidine gum foam fracturing fluid of low permeability gas reservoir and preparation method of low damage carboxymethyl hydroxypropyl guanidine gum foam fracturing fluid

A technology of carboxymethyl hydroxypropyl guanidine and foam fracturing fluid, which is applied in the field of fracturing and stimulation, can solve the problems of reservoir water damage to fracturing effect, high residue content, difficult flowback, etc., and achieve ideal fracturing effect, The effect of low residue content and reduction of production cost

Active Publication Date: 2013-03-27
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a low-damage carboxymethyl hydroxypropyl guaridine foam fracturing fluid for low-permeability gas reservoirs and its preparation method, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the residue content after conventional fracturing hydraulic fracturing High, difficult flowback, severe reservoir water damage and unsatisfactory fracturing effects

Method used

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  • Low damage carboxymethyl hydroxypropyl guanidine gum foam fracturing fluid of low permeability gas reservoir and preparation method of low damage carboxymethyl hydroxypropyl guanidine gum foam fracturing fluid

Examples

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Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1, the low-damage carboxymethyl hydroxypropyl guar gum foam fracturing fluid of the low-permeability gas reservoir contains 100 parts by weight of base liquid, 0.2 to 0.5 parts of crosslinking agent, and 0.03 to 0.03 parts of gel breaker. 0.04 parts, liquid nitrogen, the volume of liquid nitrogen is 5% to 7% of the total volume of base liquid and crosslinking agent.

Embodiment 2

[0016] Embodiment 2, the low-damage carboxymethyl hydroxypropyl guar gum foam fracturing fluid of the low-permeability gas reservoir contains 100 parts of base liquid, 0.2 or 0.5 parts of crosslinking agent, and 0.03 or 0.03 parts of breaker by weight. 0.04 parts, liquid nitrogen, the volume of liquid nitrogen is 5% or 7% of the total volume of base liquid and crosslinking agent.

Embodiment 3

[0017] Example 3, the base liquid contains 0.25 to 0.4 parts of carboxymethyl hydroxypropyl guar gum, 0.5 parts of clay stabilizer, 0.5 part of drainage aid, 0.1 part of bactericide, and 0.2 to 0.3 parts of crosslinking accelerator by weight. 98.2 to 98.45 parts of water. When carboxymethyl hydroxypropyl guar gum is added to water, it is easy to increase the viscosity, which is conducive to stirring into a uniform mixture without forming "fish eyes", which is not only convenient for liquid preparation, but also prevents the "fish eyes" from breaking the glue and affecting the reservoir s damage.

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Abstract

The invention relates to the technical field of fracturing and production increasing of an oil well or natural gas well, and in particular relates to a low damage carboxymethyl hydroxypropyl guanidine gum foam fracturing fluid of a low permeability gas reservoir and a preparation method of the low damage carboxymethyl hydroxypropyl guanidine gum foam fracturing fluid. The low damage carboxymethyl hydroxypropyl guanidine gum foam fracturing fluid of the low permeability gas reservoir contains the following components in parts by weight: 100 parts of base solution, 0.2-0.5 part of cross-linking agent, 0.03-0.04 part of gel breaker, and liquid nitrogen, wherein the liquid nitrogen accounts for 5-7 percent of total volume of the base solution and the cross-linking agent. The base solution, the cross-linking agent and a gel breaker are pumped into an underground fracturing stratum, and the liquid nitrogen is pumped, the base solution, the cross-linking agent, the gel breaker and the liquid nitrogen are mixed uniformly on the underground fracturing stratum, thus the low damage carboxymethyl hydroxypropyl guanidine gum foam fracturing fluid reaches the purpose of fracturing operation, and has the advantages of low content of residue after fracturing, good gel breaking property, rapid flowback, little damage to reservoir stratum water, and good fracturing effect. According to the low damage carboxymethyl hydroxypropyl guanidine gum foam fracturing fluid, the production cost is lowered, and the working efficiency is increased.

Description

technical field [0001] The invention relates to the technical field of fracturing stimulation of oil wells or natural gas wells, and relates to a low-damage carboxymethyl hydroxypropyl guaridine foam fracturing fluid for low-permeability gas reservoirs and a preparation method thereof. Background technique [0002] At present, hydraulic fracturing is the main means of stimulation for low-permeability gas reservoirs. Fracturing fluid is the working fluid in the process of hydraulic fracturing to transform oil and gas layers. The fracturing fluid provides a means for hydraulic fracturing operations. After forming formation fractures, carrying proppant deep into artificial fractures and fracturing, chemical decomposition or gel breaking to low viscosity ensures that most of the fracturing fluid is flowed back to the ground to purify the fractures. In view of the characteristics of low-permeability gas reservoirs and gas wells without pumping units and other equipment, it is ver...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
Inventor 郑义平乔东宇冉照辉黄治中缪庆林贾永红
Owner BC P INC CHINA NAT PETROLEUM CORP
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