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All cationic drilling fluid

An all-cation and cation technology, which is applied in the field of all-cation drilling fluid, can solve the problems of anion and cation incompatibility, achieve the effect of increasing drilling speed and avoiding dispersion

Active Publication Date: 2018-10-16
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides an all-cation drilling fluid, which can better match the zeta potential of the formation, effectively improve the stability of clay minerals, and solve the problem of anion and cation incompatibility in existing cationic drilling fluids, thereby improving drilling efficiency. speed, saving production cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Indoor evaluation of all cationic drilling fluid performance:

[0025] In the all-cation drilling fluid provided in this embodiment, each cubic meter of drilling fluid comprises: 50kg bentonite, 20kg cationic lignite first cationic fluid loss reducer (CPF), 10kg cationic lignin second cationic fluid loss reducer (CPF- 1), 8kg of the first cationic coating agent (CPH-1), 6kg of polyacrylamide second cationic coating agent (CPH-2) with a molecular weight of about 4 million, 10kg of quaternary ammonium polymers with a molecular weight of less than 500 as cationic suppression (CPI), 20kg of cationic asphalt with a particle size of 120-150 mesh as a cationic plugging agent, and the rest as water. Then add limestone powder to it until the drilling fluid density is 1.25kg / cm 3 , add 3kgNaOH to adjust the pH value to 9. The all-cation drilling fluid was aged at 150°C for 24 hours, and the test performance is shown in Table 1.

[0026] Table 1

[0027]

[0028] (where API...

Embodiment 2

[0031] Indoor evaluation of anti-saturated salt and anti-calcium performance of all-cation drilling fluid:

[0032] In the full cationic drilling fluid provided in this embodiment, every cubic meter of drilling fluid includes: 30kg bentonite, 10kg cationic inhibitor (CPI), 8kg first cationic coating agent (CPH-2), 6kg second cationic coating agent (CPH-2), 20kg of the first cationic fluid loss control agent (CPF), 20kg of the second cationic fluid loss control agent (CPF), 20kg of cationic blocking agent (CPA), and the rest is water. Wherein the selection of each cationic preparation can be the same as in Example 1. Add more spars to it until the drilling fluid density is 2.3kg / cm 3 , adjust the pH value to 10.

[0033]During the test, 360kg of sodium chloride and 60kg of gypsum were added to the above-mentioned all-cation drilling fluid, and the all-cation drilling fluid was aged at 150°C for 24 hours. The test performance is shown in Table 2.

[0034] Table 2

[0035] ...

Embodiment 3

[0038] Indoor evaluation of the temperature resistance performance of all-cation drilling fluid:

[0039] In the full cationic drilling fluid provided in this embodiment, every cubic meter of drilling fluid includes: 30kg bentonite, 10kg cationic inhibitor (CPI), 8kg first cationic coating agent (CPH-2), 6kg second cationic coating agent (CPH-2), 20kg of the first cationic fluid loss control agent (CPF), 20kg of the second cationic fluid loss control agent (CPF), 20kg of cationic blocking agent (CPA), and the rest is water. Wherein the selection of each cationic preparation can be the same as in Example 1. Add more spars to it until the drilling fluid density is 2.3kg / cm 3 , adjust the pH value to 10,

[0040] During the test, 300kg of sodium chloride was added to the above-mentioned all-cation drilling fluid, and the drilling fluid was aged at 180°C for 24 hours. The test performance is shown in Table 3.

[0041] table 3

[0042]

[0043] From the various data in Table...

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Abstract

The present invention provides an all cationic drilling fluid, each cubic meter of the drilling fluid comprises the following components: 5-15kg of a cationic inhibitor, 0-8kg of a first cation coating agent, 0-6kg of a second cation coating agent, 0-20kg of a first cation fluid loss reducer, 0-20kg of a second cation fluid loss reducer, 0-20kg of a cationic blocking agent and balance of drilling fluid base mud, wherein the cationic inhibitor is a quaternary ammonium polymer or tertiary ammonium polymer with the molecular weight of less than 500, the first cation coating agent is a polyacrylamide with the molecular weight of 400000-600000, the second cation coating agent is a polyacrylamide with the molecular weight of 1500000-5500000, the first cation fluid loss reducer is cation lignite, the second cation fluid loss reducer is cationic lignin, and the cationic blocking agent is cationic asphalt with the particle size of 80-200 meshes. All main agents of the all cationic drilling fluid all comprise cationic preparations, the all cationic drilling fluid can be better matched with the electric potential of the formation, the stability of clay minerals can be effectively improved, drilling speed is increased, and production cost is saved.

Description

technical field [0001] The invention relates to an all-cation drilling fluid, which belongs to the technical field of oil and gas drilling. Background technique [0002] During the drilling process, the stability of the borehole wall is affected by factors such as the dispersion, expansion, contraction and collapse of formation clay minerals. The stability of the borehole wall directly affects the drilling speed, and the level of the drilling speed directly affects the production cost. After research, it is found that the stability of clay minerals has a great relationship with its zeta potential. The reason is that the zeta potential of clay minerals controls the thickness of its diffusion layer and the amount of bound water. Once the zeta potential of clay minerals changes, its diffusion The thickness of the layer and the amount of bound water also change accordingly, causing the clay minerals to disperse, swell, shrink or collapse, and the stability is reduced. [0003]...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/24
Inventor 滕学清孙京平李宁周华安周志世贺江红李家学沈勤长孙俊于连成张欢庆张克勤尹建华杨川徐思旭
Owner PETROCHINA CO LTD
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