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Quick gel breaking process for intermediate and low temperate oil gas well fracturing fluid

A technology for fracturing fluids and oil and gas wells, which is applied in wellbore/well components, production fluids, drilling compositions, etc., can solve the problems of low promotion value, etc., and achieves easy on-site operation, complete gel breaking, and flowback. high rate effect

Inactive Publication Date: 2015-04-15
RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is only suitable for gel breaking of polyhydric alcohol fracturing fluid system, not suitable for gel breaking and flowback of oil and gas wells with conventional fracturing fluid system, and has little promotion value

Method used

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  • Quick gel breaking process for intermediate and low temperate oil gas well fracturing fluid
  • Quick gel breaking process for intermediate and low temperate oil gas well fracturing fluid
  • Quick gel breaking process for intermediate and low temperate oil gas well fracturing fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A rapid gel breaking process for medium and low temperature oil and gas well fracturing fluid, which at least includes the following steps: 1) adding a sufficient amount of gel breaking agent in the pre-flush stage; 2) reducing the concentration of crosslinking agent used at the construction site to form a Weakly or under-crosslinked fracturing fluid jelly; 3) In the later stage of the sand-carrying fluid stage, that is, when the sand addition is about to end, add the breaker to the fracturing fluid in a wedge shape.

Embodiment 2

[0021] According to the temperature of oil and gas wells, under the premise of ensuring that the sand-carrying fluid’s sand-carrying ability and construction safety are not affected, in the pre-fluid stage (that is, after the packer is set and before the pre-fluid stage), the fracturing Design and add a sufficient amount of breaker that matches the well temperature (the amount of breaker is 10 times the amount of breaker in the cross-linking fluid). The breaker is ammonium persulfate in the conventional fracturing fluid system. The above process It is conducive to the rapid gel breaking and flowback of the fracturing fluid at the far end of the fracture; when preparing the crosslinking agent solution at the construction site, the mass percentage concentration of the crosslinking agent is reduced from 0.6% to 0.4%, forming an under-crosslinked fracturing fluid Jelly, this under-crosslinked fracturing fluid jelly has fewer chemical bonds and a lower crosslinking density. After th...

Embodiment 3

[0023] It is basically the same as Example 2, except that in the pre-flush stage (that is, after the packer is set and before the pre-fluid stage), a sufficient amount of breaker is added according to the fracturing design to match the well temperature ( The amount of gel breaker is 8 times the amount of gel breaker used in the cross-linking fluid), and the gel breaker is potassium persulfate in the conventional fracturing fluid system; when preparing the cross-linking agent solution at the construction site, in the original formula Basically, the mass percent concentration of the cross-linking agent was reduced from 0.7% to 0.5% to form an under-cross-linked fracturing fluid jelly; Add 0.03%-0.05%-0.08%-0.1% gel breaker in wedges in order from small to large.

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Abstract

The invention discloses a quick gel breaking process for intermediate and low temperate oil gas well fracturing fluid, and the process at least comprises the following steps: 1) adding a sufficient amount of gel breaking agent in a pre-loading liquid stage; 2) lowering the use concentration of a crosslinking agent in the construction field to form weak crosslinking or under crosslinking fracturing fluid gel; and 3) in the later stage of a sand-carrying agent step, i.e., when a sand adding step is about to finish, adding a gel breaking agent into well fracturing fluid in a tail chase wedge shape. The quick gel breaking process has the following advantages: (1) the water base fracturing fluid is quick, the gel is thoroughly broken, and the flowback rate is high; (2) the gel breaking process is simple, is easy to master and is convenient to operate on site; (3) the gel breaking process is wide in applicable range, is suitable for the common guar gum fracturing fluid system and is also suitable for the water base polymer fracturing fluid system of other gel breaking agents; and (4) the gel breaking process can be used for intermediate and low temperate oil gas well fracturing at the temperature of 20-60DEG C.

Description

Technical field [0001] The invention involves the breaking glue process in the process of increasing the production of oil and gas wells. Specifically, it is a fast glue process for low -temperature oil gaseous cracks. Background technique [0002] Fracture is one of the main measures for increasing production of low -permeability oil and gas wells. Fracture is a working solution during the fracture construction., To ensure that most of the fracture liquid can return to the ground.It can be seen that the quality of the fracture liquid breaking gel rows is a key link that determines the success of the fracture.On the basis of ensuring the smooth construction, the rapid and thorough gel return excretion of the fracture can reduce the time to stay in the reservoir, reduce the degree of damage to the reservoir on the reservoir, and improve the diversion of the fracture support.Ability to improve the effect of fracture transformation. [0003] The medium and low temperature oil and ga...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/26C09K8/66C09K8/68
Inventor 吴金桥雷晓岚高瑞民高志亮乔红军张军涛段玉秀朱容婷梁小兵申峰
Owner RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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