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Solid phase-free drilling fluid

A drilling fluid, solid phase-free technology, applied in the field of drilling fluids, can solve the problems of poor plugging and anti-slump ability, easy leakage, poor salt resistance, etc. good effect

Active Publication Date: 2011-01-26
北京奥凯立科技发展股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional solid-free drilling fluids have disadvantages such as poor plugging and anti-slumping capabilities, easy leakage, and poor salt resistance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] This example mainly reflects the influence of xanthan gum on the performance of solid-free drilling fluid:

[0015] 1.1. Test formula

[0016] The solid-free drilling fluid of the present embodiment is made up of water, xanthan gum, carboxymethyl cellulose, lubrication inhibitor, sulfonated asphalt, superfine calcium carbonate and non-permeable drilling fluid treatment agent BST-II; Calculation of the amount added in water: 0.4 g of carboxymethyl cellulose, 5 g of lubrication inhibitor, 2 g of sulfonated asphalt, 1 g of superfine calcium carbonate, and 2 g of non-permeable drilling fluid treatment agent BST-II. The variables in Table 1 represent yellow Raw gum was tested at 0.2 gram, 0.3 gram and 0.5 gram respectively.

[0017] 1.2. Test data

[0018] Table 1 Effect of xanthan gum on properties of solids-free drilling fluid

[0019]

[0020] 【Remarks】Hot rolling test conditions: 130℃ / 16h,

[0021] 1.3. Experimental conclusion

[0022] It can be seen from the abo...

Embodiment 2

[0024] This example mainly reflects the influence of lubrication inhibitor on the performance of solid-free drilling fluid:

[0025] 2.1. Test formula

[0026] The solid-free drilling fluid of the present embodiment is made up of water, xanthan gum, carboxymethyl cellulose, lubrication inhibitor, sulfonated asphalt, superfine calcium carbonate and non-permeable drilling fluid treatment agent BST-II; Calculation of the amount added in water: 0.3 grams of xanthan gum, 0.4 grams of carboxymethyl cellulose, 2 grams of sulfonated asphalt, 1 gram of superfine calcium carbonate, 2 grams of non-permeable drilling fluid treatment agent BST-II, the variables in Table 2 represent Lubrication inhibitors were tested at 3 grams, 5 grams and 7 grams respectively.

[0027] 2.2. Test data

[0028] Table 2 Effect of bioinhibitory lubricant on the performance of solids-free drilling fluid

[0029]

[0030] 【Remarks】Hot rolling test conditions: 130℃ / 16h

[0031] 2.3. Experimental conclusio...

Embodiment 3

[0034] This example mainly reflects the influence of non-permeable drilling fluid treatment agent BST-II on the performance of solid-free drilling fluid

[0035] 3.1. Test formula

[0036] The solid-free drilling fluid of the present embodiment is made up of water, xanthan gum, carboxymethyl cellulose, lubrication inhibitor, sulfonated asphalt, superfine calcium carbonate and non-permeable drilling fluid treatment agent BST-II; Calculation of the amount added in water: 3 grams of lubrication inhibitor, 0.3 grams of xanthan gum, 0.4 grams of carboxymethyl cellulose, 2 grams of sulfonated pitch, and 1 gram of superfine calcium carbonate. The variables in Table 3 represent non-permeable drilling fluid treatment Agent BST-II was tested at 1 gram, 2 gram and 3 gram respectively.

[0037] 3.2. Test data

[0038] Table 3 Effect of non-permeable drilling fluid treatment agent BST-II on the performance of solids-free drilling fluid

[0039]

variable

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Abstract

The invention relates to solid phase-free drilling fluid, which consists of water, xanthan gum, carboxymethyl cellulose, a lubrication inhibitor, sulfonated asphalt, superfine calcium carbonate and a permeability-free drilling fluid treating agent BST-II; and 0.1 to 0.5g of xanthan gum, 0.3 to 0.7g of carboxymethyl cellulose, 3 to 10g of lubrication inhibitor, 1 to 5g of sulfonated asphalt, 1 to 5g of superfine calcium carbonate and 1 to 3g of permeability-free drilling fluid treating agent BST-II are added into each 100 milliliters of water. The solid phase-free drilling fluid has the advantages of high temperature resistance, salt resistance, calcium resistance, excellent anti-pollution performance, high wellbore purification capacity in actual application, capacity of keeping stable well wall, good wellbore lubricating property, control of filtration and leakage, and capacity of reducing damage to hydrocarbon reservoir to the greatest degree.

Description

technical field [0001] The invention relates to a drilling fluid used in drilling engineering, in particular to a solid-free drilling fluid. Background technique [0002] With the development of drilling fluid technology, in the drilling of some special wells such as horizontal wells, slim hole wells and deep wells, new requirements are put forward for the performance of drilling fluids. For example: good wellbore purification; maintain wellbore stability; good wellbore lubrication performance; control fluid loss and leakage; minimize damage to oil and gas reservoirs, etc. There are also higher requirements for the environmental protection, stability, pollution, and improvement of the drilling speed of the drilling fluid. Conventional solid-free drilling fluids have disadvantages such as poor plugging and anti-slump capabilities, easy leakage, and poor salt resistance. Contents of the invention [0003] For this reason, the technical problem to be solved by the present i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/10
Inventor 董海军王铁林周文欣张亮亮王文瑞
Owner 北京奥凯立科技发展股份有限公司