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Imitated oil base high-density drilling fluid

A high-density, drilling fluid technology, applied in the field of drilling fluid, can solve the problems of polluting the environment, high cost, affecting oil and gas layer display, etc., and achieve the effects of suppressing collapse, achieving wellbore stability, and good oil-based performance

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

[0003] For this reason, the technical problem to be solved by the present invention is to provide a high-temperature-resistant, salt-resistant and anti-pollution imitation oil-based high-density drilling fluid, whose comprehensive performance can be compared with oil-based high-density drilling fluid, and overcomes the oil-based high-density drilling fluid. Disadvantages of drilling fluid polluting the environment, affecting oil and gas layer display and high cost

Method used

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  • Imitated oil base high-density drilling fluid
  • Imitated oil base high-density drilling fluid
  • Imitated oil base high-density drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Preferred tests for in-house formulations:

[0016] 1. Base slurry selection

[0017] The base slurry required for the test is optimized, and the experimental data are shown in Table 1:

[0018] Table 1 Conventional properties of base pulp with different contents

[0019] project

AV

PV

API (mL)

2% Base pulp

2

2

34.0

3% Base pulp

3

2

27.0

4% Base pulp

5

2

21.8

[0020] Note: In the present invention, the meaning of 2% base slurry is: add 2 grams of sodium bentonite per 100 grams of water (3% base slurry, 4% base slurry, etc. have the same meanings, which are well-known expressions for those skilled in the art method, and will not be described one by one).

[0021] Reduce the solid phase content as much as possible, and at the same time take into account the two indicators of rheology and water loss. Combined with the experimental data, 3% sodium-based bentonite slurry is sele...

Embodiment 2

[0044] According to the above test data in Example 1, the formulation of the oil-based high-density drilling fluid in this example is as follows: 3% base slurry + 0.3% FA367 + 5% lubrication inhibitor + 3% SMC + 1% SPNH + 2% sulfonation Bitumen + 1% shielding temporary plugging agent + 6% KCl. The performance experimental data of the imitation oil-based high-density drilling fluid in this example is shown in Table 8:

[0045] Table 8 Normal temperature and high temperature performance of imitation oil-based high-density drilling fluid in this example

[0046]

[0047] From the above data, it can be seen that the imitated oil-based high-density drilling fluid of this example can maintain good rheological and water loss properties after hot rolling at 160°C for 16 hours.

[0048] Table 9 Lubricity evaluation results of imitation oil-based high-density drilling fluid in this example

[0049] drilling fluid

Lubrication coefficient

mud cake viscosity

Im...

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Abstract

The invention relates to an imitated oil base high-density drilling fluid which is characterized by comprising 2-4% fresh water bentonite slurry, a tackifier, a high temperature resistant filtrate loss reducer, a lubricant, a shielding plugging agent, an anti-caving agent and inorganic salt. The 2-4% fresh water bentonite slurry is base slurry formed by adding 2-4 g of sodium base bentonite to each 100 ml of water. In every 100 ml of 2-4% fresh water bentonite slurry, the drilling fluid comprises 0.2-0.5 g of tackifier, 3-6 g of high temperature resistant filtrate loss reducer, 3-10 g of lubricant, 1-3 g of shielding plugging agent, 2-4 g of anti-caving agent and 5-8 g of inorganic salt. The imitated oil base high-density drilling fluid resists high temperature, salts and pollution, the comprehensive properties of the imitated oil base high-density drilling fluid are equivalent to those of an oil base high-density drilling fluid, and the defects of environmental pollution, influence on the display of an oil-gas layer and high cost of the oil base high-density drilling fluid are overcome.

Description

technical field [0001] The invention relates to a drilling fluid used in petroleum drilling engineering, in particular to an oil-based high-density drilling fluid suitable for drilling horizontal wells of special high-pressure oil and gas reservoirs and high-pressure sidetracking horizontal wells. Background technique [0002] With the development of drilling technology, the need to improve the performance of drilling fluid has become more and more obvious in recent years when developing horizontal wells and sidetracking horizontal wells in high-pressure oil and gas fields. Although oil-based drilling fluid has many advantages, it has the disadvantages of polluting the environment, affecting the display of oil and gas layers, and high cost. Through the analysis of the current research status of oil-based high-density drilling fluid system at home and abroad, the imitation oil-based high-density water-based drilling fluid has defects such as high soil content, poor rheology, ...

Claims

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Application Information

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IPC IPC(8): C09K8/22C09K8/20C09K8/14
Inventor 周文欣王文瑞王雷卢丙朵韩晓华
Owner 北京奥凯立科技发展股份有限公司
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