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Carboxymethyl hydroxypropyl guanidine gum fracturing fluid

A technology of carboxymethyl hydroxypropyl guanidine and glue pressing, which is applied in the field of carboxymethyl hydroxypropyl guanidine fracturing fluid, can solve the problems of high cost and complicated preparation, and achieve the goal of less reservoir damage and low frictional resistance Effect

Active Publication Date: 2012-08-15
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this fracturing fluid is that the thickeners used are two kinds of 0.6% carboxymethyl hydroxypropyl guar gum and 0.35% polyacrylamide, which are expensive and complicated to prepare

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Example 1: Well Xiliu 10-96, the fracturing section is 3106.0-3123.6m, and the formation temperature is 105°C.

[0054] The preparation process of the carboxymethyl hydroxypropyl guar gum fracturing fluid:

[0055] Step 1: prepare bactericidal preservative JA-1: be 95% monomethylamine aqueous solution (the concentration of monomethylamine aqueous solution is 40%) and 5% sodium pentachlorophenate mixed and stirred for 10 minutes by weight percent, make Sodium pentachlorophenate dissolved completely.

[0056] Step 2: Prepare non-ionic drainage aid: the weight percentage of each component is:

[0057] Nonionic fluorocarbon surfactant (AF4018-Y, 1.5%;

[0058] Nonionic fluorocarbon surfactant EC602T, 1.5%;

[0059] Polyoxyethylene (10) alkylphenol ether OP-10, 5%;

[0060] C 12～18 Fatty alcohol polyoxyethylene (10) ether (Pingpingjia O-10), 5%;

[0061] Methanol, 20%;

[0062] Water, 67%.

[0063] Preparation method of non-ionic drainage aid: first add methanol to t...

Embodiment 2

[0069] Example 2: Well Su 75-70-6H has a fracturing section of 3,587-4,592m and a horizontal section of 1,005m long. It is a natural gas well with a reservoir temperature of 115°C. It is fractured in 10 sections with open hole packers.

[0070] Carboxymethyl hydroxypropyl guar gum fracturing fluid, preparation process:

[0071] Step 1, step 2 and step 3 are the same as in embodiment 1.

[0072] Step 4: Preparation of carboxymethyl hydroxypropyl guar gum fracturing fluid: carboxymethyl hydroxypropyl guar gum fracturing fluid, the weight percentage of each component is: 0.35% carboxymethyl hydroxypropyl guar gum; 0.5% organic clay Stabilizer; 0.4% cross-linking regulator; 0.05% bactericidal preservative (JA-1); 0.5% non-ionic drainage aid; 0.2% cross-linking agent; 0.1% ammonium persulfate; the rest is water; the weight of each component The sum of the percentages is 100%.

[0073] The preparation method of carboxymethyl hydroxypropyl guar gum fracturing fluid is basically the...

Embodiment 3

[0075] Example 3: Well Lu 43-32 was fractured in 4 stages with a hydraulic spray gun in a fracturing section of 3188.0-3301.6m, 113.6m long, and a reservoir temperature of 121°C.

[0076] Step 1, step 2 and step 3 are the same as in embodiment 1.

[0077] Step 4: Preparation of carboxymethyl hydroxypropyl guar gum fracturing fluid: carboxymethyl hydroxypropyl guar gum fracturing fluid, the weight percentage of each component is: 0.4% carboxymethyl hydroxypropyl guar gum; 0.5% organic clay Stabilizer; 0.4% cross-linking regulator; 0.05% JA-1 bactericidal preservative; 0.5% non-ionic drainage aid; 0.25% cross-linking agent; 0.1% ammonium persulfate; the rest is water; and for one hundred percent.

[0078] The dosing method is the same as in Example 1. The difference is: when the carboxymethyl hydroxypropyl guar gum fracturing base fluid is injected into the well during fracturing construction, 0.25% cross-linking agent is evenly added; when ammonium persulfate is added, it is ...

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PUM

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Abstract

The invention relates to a carboxymethyl hydroxypropyl guanidine gum fracturing fluid which is used for fracturing reformation of a high-temperature and low-permeability reservoir. The carboxymethyl hydroxypropyl guanidine gum fracturing fluid comprises the components by weight percent: 0.25-0.6% of carboxymethyl hydroxypropyl guanidine gum, 0.2-0.6% of cross-linking agent, 0.2-0.4% of cross-linking regulator, 0.5-1% of clay stabilizer, 0.05-0.1% of bactericidal preservative, 0.2-0.5% of discharge aiding agent, 0.0001-0.15% of ammonium persulfate and the balance of water. A preparation method of the fracturing fluid comprises the steps of: adding clear water into a large tank, adding the carboxymethyl hydroxypropyl guanidine gum into the large tank under the stirring condition, and then sequentially adding the clay stabilizer, the discharge aiding agent, the cross-linking regulator and the bactericidal preservative into the large tank; and stirring for 10 minutes until the concentration or the viscosity of liquid at the upper part and the lower part of the large tank is uniform and consistent. During fracturing construction, the cross-linking agent and gel breaker are added into the large tank according to the requirement. The carboxymethyl hydroxypropyl guanidine gum fracturing fluid has the effects of being suitable for the reservoir temperature of 80-200DEG C, reducing the residue of the fracturing fluid and the construction friction, and meeting the demand of fracturing reformation of the high-temperature and low-permeability reservoir.

Description

technical field [0001] The invention relates to the technical field of oil field fracturing and oil recovery, in particular to a fracturing fluid for oil and gas field fracturing reconstruction, which is a carboxymethyl hydroxypropyl guaridine fracturing fluid used for high-temperature and low-permeability reservoirs. Background technique [0002] With the increasing depth of exploration and development of oil and gas reservoirs, the temperature of oil and gas well reservoirs is also getting higher and higher. The wells above 130°C (Wugu 4 Well is 5284m deep and the temperature is 175°C; Niudong 1 Well is 6027m deep and the temperature is 200°C). Very common. At present, the existing fracturing fluid system is mainly based on additives such as hydroxypropyl guar gum and organic boron crosslinking agent, and the temperature resistance is within 130 °C. Among them, the thickener hydroxypropyl guar gum has a relatively high water-insoluble content. During fracturing, not only ...

Claims

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Application Information

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IPC IPC(8): C09K8/68
Inventor 崔会杰车航余东合刘国华喻鹏
Owner PETROCHINA CO LTD
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