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Solid-free drilling fluid

A drilling fluid and solid phase-free technology, which is applied to drilling compositions, chemical instruments and methods, etc., can solve the problem of unavailability of fluid loss control agent in solid phase-free drilling fluid system, and achieve good use effect and application value. , stable performance, good lubricity and fluid loss reduction

Inactive Publication Date: 2014-01-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the obtained fluid loss control agent cannot be used in the solid-free drilling fluid system

Method used

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  • Solid-free drilling fluid
  • Solid-free drilling fluid
  • Solid-free drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] In this example, the solid-free drilling fluid is prepared with polymer swelling microparticles A. The specific steps are: add 400mL of water and 1g (0.25wt%) polymer swelling particle A to the high stirring cup; and stir the solution at a high speed of 10000 rpm for 20min; check the conventional performance data at room temperature in Table 1 ; Then roll the above solution at 120°C for 16 hours, and see Table 1 for the conventional performance data after aging at 120°C.

Embodiment 2

[0027] In this example, the solid-free drilling fluid is prepared with polymer swelling microparticles A. The specific steps are: add 400mL water, 1g (0.25wt%) polymer swelling particle A and 8g (2wt%) NaCl to the high stirring cup; and stir the solution at a high speed of 10000 rpm for 20min; See Table 1 for the conventional performance data; then heat the above solution at 120°C for 16 hours, and check the routine performance data after aging at 120°C in Table 1.

Embodiment 3

[0029] In this example, the solid-free drilling fluid is prepared with polymer swelling microparticles A. The specific steps are: add 400mL water to the high stirring cup; add 2g (0.5wt%) polymer swelling particle A and 0.4g NaOH; and stir the solution at a high speed of 10000 rpm for 20min; detect its normal temperature at room temperature The performance data is shown in Table 1; and then the above solution is hot rolled at 120°C for 16 hours, and the conventional performance data after aging at 120°C is shown in Table 1.

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PUM

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Abstract

The invention provides solid-free drilling fluid. The solid-free drilling fluid comprises water and polymer swelling particles, and preferably, the solid-free drilling fluid also comprises alkali and / or salt. The solid-free drilling fluid provided by the invention can be formed by matching polymer swelling particles with different types, different swelling multiples and different particle sizes according to stratum requirements. The solid-free drilling fluid has the advantages of stable performance, high temperature resistance, high salt resistance, high rheological property, high lubricity and high filtration reducing property, and has simpler slurry matching and maintenance processes compared with conventional solid-free drilling fluid.

Description

technical field [0001] The invention relates to a solid phase-free drilling fluid. Background technique [0002] The solid-free drilling fluid system does not contain bentonite, and its main components are organic polymers and salts. Using salts as weighting agents and inhibitors to improve the anti-collapse ability of the system; using polymers as viscosity and shearing agents to make the system have a good ability to carry suspended cuttings; compared with clear water, there is no solid phase Drilling fluid can form a thin and tough adsorption film on the well wall, has a certain ability to protect the wall from collapsing, and has better lubrication and drag reduction effects; compared with solid-phase drilling fluid containing bentonite, it has low flow resistance and viscosity Adjustable and other advantages are beneficial to the normal operation of the downhole motor and the improvement of the rock breaking efficiency of the bottom hole drill bit, thereby maintaining ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/12C08F220/56C08F220/06C08F228/02C08J3/24
CPCC09K8/12C08F220/06C08F220/56C08F228/02C08F2800/20C08J3/24C08J2333/26
Inventor 赵素丽钱晓琳陈铖杨小华李胜董晓强王琳
Owner CHINA PETROLEUM & CHEM CORP
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