Self-heating fracturing fluid with controllable peak temperature, and preparation method and application of self-heating fracturing fluid

A peak temperature and self-generated technology, applied in the field of fracturing fluid, can solve the problems of unsuitable high pour point oil reservoirs, etc., achieve good heat generation effect, improve development effect, and reduce production cost

Active Publication Date: 2020-10-30
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

This system can generate a large amount of foam to play the role of plugging and profile control, but the rising temperature is about 10°C lower, which is not suitable for the development of high pour point oil reservoirs

Method used

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  • Self-heating fracturing fluid with controllable peak temperature, and preparation method and application of self-heating fracturing fluid
  • Self-heating fracturing fluid with controllable peak temperature, and preparation method and application of self-heating fracturing fluid
  • Self-heating fracturing fluid with controllable peak temperature, and preparation method and application of self-heating fracturing fluid

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preparation example Construction

[0063] The present invention also protects a method for preparing fracturing fluid with controllable peak temperature and self-generated heat, which includes the following steps:

[0064] S1, preparing self-generating heat fracturing fluid base fluid;

[0065] S2, preparing an activator solution, pouring the formulated amount of the activator into the formulated amount of water, at a rate of 1-2 ml / min, stirring and mixing evenly at a rotating speed of 400-600 r / min, to obtain an activator solution;

[0066] S3, fully mix the self-generating fracturing fluid base fluid obtained in S1 with the activator solution obtained in S2 in proportion to obtain the self-generating fracturing fluid with controllable peak temperature.

[0067] Further, the specific method for preparing self-generating heat fracturing fluid base fluid in the S1 includes the following steps:

[0068] S101, add the formulated amount of nitrite into the formulated amount of water, stir and mix evenly under the...

Embodiment 1

[0079] This embodiment provides a self-generating heat fracturing fluid with controllable peak temperature, which is prepared by mixing the self-generating heat fracturing fluid base fluid and the activator solution at a mass ratio of 20:1.

[0080] Further, the raw material composition of the self-generating heat fracturing fluid base fluid is as follows:

[0081] Urea 2g, sodium nitrite 6.9g, ammonium chloride 5.35g, thickener hydroxypropyl guar gum 0.3g, crosslinking agent (crosslinking agent JL-13) 1g, regulator sodium hydroxide solution 1g, drainage aid Sodium lauryl sulfate 0.5g, fungicide formaldehyde 0.1g, gel breaker ammonium persulfate 0.06g, clay stabilizer potassium chloride 0.3g, water 82.49g.

[0082]The raw material composition of described activator solution is as follows:

[0083] Hydrochloric acid 1.6g, water 98.4g; oxalic acid 1.6g, water 98.4g; citric acid 1.6g, water 98.4g.

[0084] Specifically, the crosslinking agent JL-13 is to mix glycerol and water ...

Embodiment 2

[0095] A self-generating heat fracturing fluid with controllable peak temperature is prepared by mixing a self-generating heat fracturing fluid base fluid and an activator solution at a mass ratio of 20:1.

[0096] Further, the raw material composition of the self-generating heat fracturing fluid base fluid is as follows:

[0097] Urea 2g, sodium nitrite 6.9g, ammonium chloride 5.35g, thickener hydroxypropyl guar gum 0.3g, crosslinking agent JL-131g, conditioner 1g, drainage aid 0.5g, fungicide formaldehyde 0.1g, Glue ammonium persulfate 0.06g, clay stabilizer potassium chloride 0.3g, water 82.49g.

[0098] The cross-linking agent JL-13 is to mix glycerol and water uniformly according to the mass ratio of 1:4, and add 4g sodium hydroxide and 26g borax in sequence, and raise the temperature to 40°C at 400r / min-500r / min Stir continuously at a rotating speed, add 5g of sodium gluconate after it is completely dissolved, and heat it in a water bath at 60°C for 3-4h to obtain it. ...

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Abstract

The invention discloses a self-heating fracturing fluid with controllable peak temperature, and a preparation method and application of the self-heating fracturing fluid. The self-heating fracturing fluid is prepared by mixing a self-heating fracturing fluid base fluid and an activator solution according to a mass ratio of (18-22): (0.8-1.2). According to the self-heating fracturing fluid, a urea/nitrite/ammonium salt/low-concentration acidic activator system is adopted; according to the system, after a low-concentration activator is added, HNO2, NH4<+> and NH3.H2O undergo a thermochemical reaction, so a good heat generation effect is achieved and the cold damage of the fracturing fluid to a stratum is reduced; meanwhile, when the use concentration of an activator solution is 0.005%-0.04%,time for reaching the peak temperature is 1-5 hours, and the peak temperature reaches 48-105 DEG C, so the temperature for reservoir development is controllable, the cold damage of the fracturing fluid to the stratum is reduced, the gel breaking of the fracturing fluid can be enhanced by increasing the temperature, and secondary damage to the stratum is reduced; and therefore, the fracturing fluid is suitable for yield increase and transformation of high-pour-point oil reservoirs and low-temperature reservoirs.

Description

technical field [0001] The invention belongs to the technical field of fracturing fluids, and in particular relates to a self-generating fracturing fluid with controllable peak temperature and its preparation method and application. Background technique [0002] Conventional hydraulic fracturing is an important technical measure to increase the productivity of oil wells and ensure the normal production of oil wells. It is widely used in the production of new wells and tapping the potential of old wells. However, when conventional hydraulic fracturing methods are used to perform fracturing operations on high pour point oil reservoirs, the fracturing effect often lags behind or fails to reach the expected output, resulting in poor production stimulation effects of fracturing operations and low post-fracture flowback rate. Low, and the effective period of increasing production is short. The reason is that high pour point reservoirs are sensitive to temperature changes. After f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/66C09K8/68C09K8/88C09K8/592
CPCC09K8/665C09K8/685C09K8/887C09K8/592
Inventor 宇文昔涵张冕高燕罗明良王亚军王改红安子轩邵秀丽陶长州纪冬冬朱丽战永平雷明吕莉李燕红
Owner BC P INC CHINA NAT PETROLEUM CORP
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