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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, applied in the direction of wellbore/well components, production fluid, drilling composition, etc., which can solve the problems of little promotion value and achieve convenient on-site operation, complete gel breaking, and flowback high rate effect

Inactive Publication Date: 2012-07-11
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
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Effect test

Embodiment 1

[0019] A rapid gel breaking process for fracturing fluid in medium and low temperature oil and gas wells, which at least includes the following steps: 1) adding a sufficient amount of gel breaker in the pre-fluid stage; 2) reducing the use concentration of the cross-linking agent on the construction site to form a A weakly cross-linked or under-cross-linked fracturing fluid jelly; 3) At the end of the sand-carrying fluid stage, that is, when the sand addition is about to end, the gel breaker is added to the fracturing fluid in a trailing wedge shape.

Embodiment 2

[0021] According to the temperature of oil and gas wells, on the premise of ensuring that the sand-carrying fluid carrying capacity and construction safety are not affected, in the pre-fluid stage (that is, after the packer is set and before the pre-fluid stage), according to the fracturing method. It is designed to 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), and the breaker is ammonium persulfate in a conventional fracturing fluid system. The above process It is beneficial for the fracturing fluid at the far end of the fracture to break the gel quickly; when preparing the cross-linking agent solution at the construction site, reduce the mass percentage concentration of the cross-linking agent from 0.6% to 0.4% to form an under-cross-linked fracturing fluid Gelatin, this under-crosslinked fracturing fluid jelly has few chemical bonds and low crosslinking density, and t...

Embodiment 3

[0023] It is basically the same as Example 2, the difference is that in the pre-fluid stage (that is, after the packer is set and before the pre-fluid stage), a sufficient amount of breaker ( The amount of the breaker is 8 times the amount of the breaker used in the cross-linking fluid), and the breaker is potassium persulfate in the conventional fracturing fluid system; when preparing the cross-linking agent solution at the construction site, the original formula On the basis, the mass percentage concentration of the cross-linking agent was reduced from 0.7% to 0.5% to form an under-cross-linked fracturing fluid gel; in the later stage of the sand-carrying fluid stage, that is, when the sand addition was about to end, the fracturing fluid was added according to the following formula. Add 0.03%-0.05%-0.08%-0.1% mass percentage concentration of gel breaker in order from small to large in wedge shape.

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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 relates to a gel-breaking process in the process of increasing production of oil and gas wells, in particular to a rapid gel-breaking process for medium-low temperature oil and gas well fracturing fluid. Background technique [0002] Fracturing is one of the main production stimulation measures for low-permeability oil and gas wells. The fracturing fluid is the working fluid in the fracturing construction process. It plays the role of transmitting pressure, depressing the formation, carrying proppant into the fracture, and breaking the gel to low viscosity after fracturing. , Ensure that most of the fracturing fluid can flow back to the ground. It can be seen that the effect of gel breaking and flowback of fracturing fluid is a key link to determine the success of fracturing. On the basis of ensuring smooth construction, rapid and thorough flowback of the fracturing fluid can reduce the residence time of the fracturing fluid in the reser...

Claims

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Application Information

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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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