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High temperature resistance solid free low damage well killing fluid and preparation method thereof

A killing fluid and solid-free technology, applied in the field of killing fluid, can solve the problems of large dosage, single performance, weak brine thickening ability, etc., and achieve the effect of convenient preparation, simple formula and low corrosion rate

Active Publication Date: 2015-05-13
北京北福投资有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the polymers used in well killing fluids have problems such as single performance, weak brine thickening ability, and large dosage.

Method used

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  • High temperature resistance solid free low damage well killing fluid and preparation method thereof
  • High temperature resistance solid free low damage well killing fluid and preparation method thereof
  • High temperature resistance solid free low damage well killing fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 21m3

[0092] Example 2 with 1m 3 , the specific gravity is 1.6g / cm 3 For example, prepare according to the well fluid formula.

[0093] formula:

[0094] Potassium sulfomethyl humate 48kg;

[0095] Potassium formate 1232kg;

[0096] A quaternary multifunctional polymer with a molecular weight of 2 million (acrylamide: N,N-dimethylacrylamide: 2-acrylamido-2-methylpropanesulfonic acid: sodium acrylate in a molar ratio of 4:3:70 : 25) 16kg;

[0097] Low-viscosity polyanionic cellulose (purchased from Mingzhu Chemical Co., Ltd.) 24kg;

[0098] NTA and sodium molybdate, sodium citrate ratio are the mixture 2.4kg of 1: 1: 0.5;

[0099] 277.6kg of water.

[0100] The preparation method, detection index and detection method are as in Example 1. The test results are shown in Table 4 and all meet the requirements.

[0101] Table 4 Test results of killing fluid performance indicators

[0102]

[0103]

Embodiment 31m3

[0104] Example 3 with 1m 3 , the specific gravity is 2.1g / cm 3 For example, prepare according to the well fluid formula.

[0105] formula:

[0106] Potassium sulfomethyl humate 16.8kg;

[0107] Cesium formate 1604.4kg;

[0108] The molecular weight is 1 million quaternary multifunctional polymers (the molar ratio of acrylamide: N,N-dimethylacrylamide: 2-acrylamido-2-methylpropanesulfonic acid: sodium acrylate is 67:5:10: 20.5) 10.5kg;

[0109] Low-viscosity polyanionic cellulose (purchased from Mingzhu Chemical Co., Ltd.) 20kg;

[0110] NTA and sodium molybdate, sodium citrate ratio are 1.2kg of the mixture of 1: 1: 0.2;

[0111] 447.1kg of water.

[0112] The preparation method, detection index and detection method are as in Example 1. The test results are shown in Table 5 and all meet the requirements.

[0113] Table 5 Test results of killing fluid performance indicators

[0114]

[0115] In the experimental example, the specific gravity is 2.1g / cm 3 As an exam...

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PUM

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Abstract

The invention relates to high temperature resistance solid free low damage well killing fluid and a preparation method of the high temperature resistance solid free low damage well killing fluid, and belongs to the field of petroleum and natural gas exploration and development. The high temperature resistance solid free low damage well killing fluid is composed of the following components: multifunctional polymers, modified brown coal, water-soluble cellulose ethers derivative, high temperature corrosion mitigation stabilizer, organic salt weighting agent, and water. Quality percentage composition of the components is as follows: 0.3%-2% of the multifunctional polymers, 0.5%-5% of the modified brown coal, 0.3%-2% of the water-soluble cellulose ethers derivative, 0.01%-0.3% of the high temperature corrosion mitigation stabilizer, and dosage of the organic salt weighting agent is controlled to ensure that density of the high temperature resistance solid free low damage well killing fluid achieves 1.0 gram / cubic centimeter-2.3 grams / cubic centimeter, and the balance is the water. The high temperature resistance solid free low damage well killing fluid is low in filter loss, thin in filter cakes, and capable of protecting stratum environment from being polluted and damaged, ensuring viscosity of the high temperature resistance solid free low damage well killing fluid to reserve more than half under long-term high temperature stratum shear, and having the effect of swelling prevention and corrosion mitigation.

Description

technical field [0001] The invention relates to a well killing fluid used in oil and gas well operations during oil and natural gas exploration and development, in particular to a high temperature resistant, solid-phase, low-damage well killing fluid used in the operation of strong water-sensitive oil and gas reservoirs . Background technique [0002] With the deepening of oilfield development, the properties of formation reservoirs become more complex, and all oilfield companies have higher requirements for the protection of oil and gas layers. With the continuous emergence of changes in development modes (such as extended reach, horizontal wells, branch wells, etc.), environmental protection has become more stringent. With the deepening of oil and gas wells, the formation temperature and pressure increase, and the killing fluid is faced with the difficulties of high temperature and high pressure. It is required that the killing fluid has good stability and rheology at ult...

Claims

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Application Information

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IPC IPC(8): C09K8/48
Inventor 贾路生沙丽
Owner 北京北福投资有限公司
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