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Nonclay one-way plugging drilling fluid

A drilling fluid and clay-free technology, which is applied in the field of oil drilling, can solve the problems of no plugging agent, high fluid loss, poor temperature resistance, etc., and achieve low friction and torque, excellent lubricating performance, and low overall cost Effect

Inactive Publication Date: 2013-04-03
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The deficiencies of the above two existing technologies are: (1) The dry powder of natural plant glue or modified natural polymer is used as a thickening agent in the drilling fluid, which has poor temperature resistance; (2) There is no plugging agent in the drilling fluid , cannot form an effective plugging layer, the fluid loss is high, and it is easy to cause leakage; (3) Drilling fluid easily enters the reservoir to block the pores of the reservoir, and the ability to protect the reservoir is poor, affecting oil recovery

Method used

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  • Nonclay one-way plugging drilling fluid
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  • Nonclay one-way plugging drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046]Add 1000 parts of clear water to the mixing tank, add 15 parts of sulfonate copolymer fluid loss reducer DSP-2 and 2 parts of xanthan gum FT into the clear water in turn, stir to fully dissolve; add 10 parts of amino polyol AP-1, 50 parts of polymer elastic microspheres SFH-1 and 10 parts of FYR lubricant, stir evenly; add 100 parts of potassium formate, stir well to dissolve it, and then it becomes clay-free one-way plugging drilling fluid. The clay-free unidirectional plugging drilling fluid prepared by the method in Example 1 was taken to investigate its performance, and the results are shown in Table 1.

[0047] Table 1

[0048]

Embodiment 2

[0050] Add 1000 parts of water to the mixing tank, add 20 parts of sulfonate copolymer fluid loss reducer DSP-2 and 3 parts of xanthan gum FT into the water in turn, stir to fully dissolve; add 5 parts of amino polyol AP-1, 70 parts of polymer elastic microspheres SFH-1 and 15 parts of FYR lubricant, stir evenly; add 200 parts of sodium formate, stir well to dissolve it, and then it becomes clay-free one-way plugging drilling fluid. The clay-free unidirectional plugging drilling fluid prepared by the method in Example 2 was used to investigate its performance, and the results are shown in Table 2.

[0051] Table 2

[0052]

Embodiment 3

[0054] Add 1000 parts of clear water to the mixing tank, add 30 parts of sulfonate copolymer fluid loss reducer DSP-2 and 2 parts of xanthan gum FT into the clear water in turn, stir to fully dissolve; add 15 parts of amino polyol AP-1, 60 parts of polymer elastic microspheres SFH-1 and 20 parts of FYR lubricant, stir evenly; add 150 parts of sodium formate and 50 parts of potassium formate, stir well to dissolve it, and it becomes the clay-free one-way plugging drilling fluid. Get the clay-free unidirectional plugging drilling fluid prepared by the method of Example 3, investigate its performance, and the results are shown in Table 3:

[0055] table 3

[0056]

[0057] As can be seen from the above experimental results, the clay-free unidirectional plugging drilling fluid of the present invention has higher viscosity and shear force at room temperature and high temperature conditions, which meets the requirements of operation and construction, and the plugging rate and per...

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Abstract

The invention relates to a nonclay one-way plugging drilling fluid. The raw material comprises the following components by mass part: 5-40 parts of main anchoring agent, 1-5 parts of auxiliary anchoring agent, 20-150 parts of one-way plugging agent, 5-20 parts of inhibiting agent, 0-20 parts of lubricating agent, 0-500 parts of weighting agent and 1000 parts of water, wherein the main anchoring agent is made of polyacrylamide, polyanionic cellulose or sulfonate copolymer fluid loss additive DSP-2; the auxiliary anchoring agent is made of xanthan gum or sodium carboxymethyl cellulose; the one-way plugging agent is made of polymer elastic microspheres SFH-1 or rubber particles; the inhibiting agent is made of amino polyol, potassium polyacrylate or polyhydric alcohols; the lubricating agent is made of the drilling fluid FYR lubricating agent, white oil or black lead; and the weighting agent is made of one of sodium formate and potassium formate or the mixture of sodium formate and potassium formate. The drilling fluid has the characteristic of one-way plugging, so as to be taken as drilling fluid, completion fluid or workover fluid; and the remarkable effects of improving the drilling rate, stabilizing the well wall and protecting a reservoir are achieved.

Description

technical field [0001] The invention relates to a clay-free unidirectional plugging drilling fluid, which belongs to the technical field of petroleum drilling. technical background [0002] Drilling fluid, formerly known as mud, refers to the working fluid used in drilling. The main function of drilling fluid is to cool the drill bit and lubricate the drill tool; clean the bottom of the hole and bring out cuttings (carrying rock). Protect hole wall from collapse, balance formation pressure, etc. Conventional water-based drilling fluid is composed of various materials such as clay, viscosifier, fluid loss reducer, anti-slump agent, lubricant and oil layer protection agent. Different materials have different effects on the performance of drilling fluid, making maintenance difficult. Among them, clay is the basic slurry-making material of conventional water-based drilling fluids, which can be dispersed into extremely fine particles (generally less than 2 microns in size) thro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/12C09K8/44
Inventor 吕开河任冠龙邢德钢
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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