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Super guanidine gum fracturing fluid

A technology of super guar gum and fracturing fluid, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., and can solve problems such as temperature difference and poor anti-swelling stability of clay

Active Publication Date: 2012-09-19
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fracturing fluid crosslinking agent is an organic borate, which has poor temperature resistance (<120°C) and poor anti-swelling stability to clay

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Example 1: Well Meng 16-19 has a fracturing section of 770.6-781.4m, and the reservoir temperature is 36°C. The weight percentage of each component of the fracturing fluid original glue solution: 0.25% super guar gum; 1.5% potassium chloride; 0.5% organic clay stabilizer; 0.1% triethanolamine; 0.05% JA-1 bactericidal preservative; 0.2% non-ionic Drainage aid; 0.1% cross-linking regulator, the rest is water. The sum of the weight percentages of each component is 100%.

[0056] Preparation method of super guar gum fracturing fluid:

[0057] Step 1: preparation of JA-1 bactericidal preservative: the effective content of 95% by weight is 40% monomethylamine aqueous solution and 5% sodium pentachlorophenate mixed and stirred for 10 minutes to dissolve sodium pentachlorophenate Completely, get JA-1 Germicidal Preservative.

[0058] Step 2: Prepare the non-ionic drainage aid: the weight percentage of each component of the non-ionic drainage aid is:

[0059] Nonionic fluoro...

Embodiment 2

[0076] Example 2: Well Sai24-7X1 has a fracturing section of 1271-1282m, and the reservoir temperature is 52°C. The weight percentage of each component of the fracturing fluid original glue solution: 0.3% super guar gum; 1.5% potassium chloride; 0.5% organic clay stabilizer; 0.05% triethanolamine; 0.05% bactericidal preservative; 0.2% non-ionic drainage aid ; 0.1% cross-linking regulator, the balance is water. The sum of the weight percentages of each component is 100%.

[0077] In the preparation method of super guar gum fracturing fluid, (1) in step 1, step 2, step 3, step 4, step 5 and step 6 is identical with embodiment 1.

[0078] (2) in step 6: during fracturing construction, add 0.3% organoboron-zirconium composite cross-linking agent into the sand mixing agitator of the fracturing sand mixing vehicle, and add 0.02-0.15% ammonium persulfate in a wedge shape. It is injected into the oil well by a fracturing vehicle through a sand mixing vehicle.

[0079] The well is a...

Embodiment 3

[0080] Example 3: Well Nao 22 Ping 1 has a fracturing section of 1613-1623m, and the reservoir temperature is 63°C. The weight percentage of each component of the fracturing fluid original glue solution: 0.35% super guar gum; 1.0% potassium chloride; 1% organic clay stabilizer; 0.05% bactericidal preservative; 0.2% non-ionic drainage aid; 0.2% crosslink Regulator, the balance is water. The sum of the weight percentages of each component is 100%.

[0081] Step 1, step 2, step 3, step 4 and step 5 are the same as in embodiment 1 in the preparation method of super guar gum fracturing fluid.

[0082] Step 6: Prepare super guar fracturing fluid:

[0083] (1) First add water to the large liquid mixing tank, and add super guar gum under circulation conditions. After the material is added, circulate the large displacement for 15 minutes, and then add potassium chloride, organoclay stabilizer, and non-ionic additives in sequence. Discharge agent, cross-linking regulator and JA-1 bac...

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Abstract

The invention discloses super a guanidine gum fracturing fluid, which is used for the fracturing modification of a high-temperature and low-permeability water-sensitive storage layer. The super guanidine gum fracturing fluid comprises the following components in percentage by weight: 0.25-0.6% of super guanidine gum, 0.5-2% of potassium chloride, 0.5-1.0% of organic clay stabilizing agent, 0.05-0.1% of JA-1 sterilizing preservative, 0.2-0.5% of non-ionic discharge aiding agent, 0.1-0.2% of crosslinking regulator, 0.0001-0.15% of ammonium persulfate, 0.2-0.6% of organic boron and zirconium compound crosslinking agent and the balance of water. The super guanidine gum is added into clear water ,followed by circulating for 15 minutes at a big displacement; and then, the potassium chloride, the organic clay stabilizing agent, the discharge aiding agent, sodium thiosulfate, triethanolamine, the crosslinking regulator and sterilizing preservative are successively added to cause the concentration or the viscosity of liquid to be consistent. During the fracturing construction, the crosslinking agent and the ammonium persulfate are added. The super guanidine gum fracturing fluid has the effects that a super guanidine gum fracturing fluid series formula suitable for the temperature of the reservoir stratum is formed, the residues of the fracturing fluid are reduced, and the modification requirement on the high-temperature and low-permeability water-sensitive storage layer can be satisfied.

Description

technical field [0001] The invention relates to the technical field of oil recovery in oil fields. The patent of the invention belongs to the fracturing fluid for oil and gas field fracturing reconstruction, in particular to super guar gum and organoboron-zirconium composite cross-linked fracturing fluid for low-permeability and water-sensitive reservoirs. Background technique [0002] During the exploration and development of oil and gas reservoirs, some high-temperature, low-permeability, and water-sensitive reservoirs are often found. For example, Erlian'er Oilfield reservoir in Erlian Oilfield in North China has a buried depth of 1600-2200m, a porosity of 4-10%, and a permeability of 0.05-0.5×10 -3 μm 2 , water sensitivity index 0.6-0.8, belonging to low porosity, low permeability, strong water sensitivity reservoir. The use of ordinary hydroxypropyl guar gum and organic boron cross-linked fracturing fluid not only has a high residue content, but also has poor waterpro...

Claims

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Application Information

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IPC IPC(8): C09K8/68
Inventor 崔会杰余东合车航修书志吴刚飞
Owner PETROCHINA CO LTD
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