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Strong-plugging hydrophobic ultra-deep well high-performance water-based drilling fluid and preparation method thereof

A water-based drilling fluid and hydrophobic technology, applied in chemical instruments and methods, drilling compositions, transportation and packaging, etc., can solve the problems of inhibiting anti-slump performance and poor anti-pollution performance, and achieve improved mixing effect , Improve the stirring efficiency and expand the stirring area

Pending Publication Date: 2022-01-28
SINOPEC JIANGHAN OILFIELD SERVICE CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The drilling fluid in the above-mentioned patents has the following disadvantages: although it can meet certain requirements for use, the anti-slumping performance and anti-pollution performance are not good, so it needs to be improved

Method used

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  • Strong-plugging hydrophobic ultra-deep well high-performance water-based drilling fluid and preparation method thereof
  • Strong-plugging hydrophobic ultra-deep well high-performance water-based drilling fluid and preparation method thereof
  • Strong-plugging hydrophobic ultra-deep well high-performance water-based drilling fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] A high-performance water-based drilling fluid for strong plugging and hydrophobic ultra-deep wells, including main raw materials and auxiliary raw materials, wherein the main raw materials include 2-5% bentonite, 0.5-1% alkaline regulator, and 2 high-temperature fluid loss reducers ~6%, anti-high temperature and anti-salt fluid loss reducer 2~6%, high temperature resistant polymer fluid loss reducer 1~2%, plugging and anti-slump agent 2~5%, CMC1~2%, K-PAM0.1 ~0.3%, PHP0.1~0.2%, mud shale inhibitor 0.5~1%, potassium chloride 5~15%, calcium chloride 0.3~1%, well wall strengthening agent 2~5%, polymer coating The inhibitor is 0.1-0.5%, and the rest is weighting agent; the auxiliary raw material is water.

[0051] Wherein, the density of the drilling fluid is 1.15-1.80g / cm 3 .

[0052] The bentonite is a first-grade banton, the alkaline regulator is sodium hydroxide, the plugging and anti-collapse agent is sulfonated asphalt, cationic emulsified asphalt, and the mud shale...

Embodiment 2

[0056] A method for preparing a high-performance water-based drilling fluid for strong plugging and hydrophobic ultra-deep wells, such as Figure 1-6 shown, including the following steps:

[0057] S1: At room temperature, take a certain amount of tap water and add it to the stirring device;

[0058] S2: Control the operation of the mixing equipment, add 0.5-1% alkaline conditioner and 2-5% bentonite in proportion and stir evenly;

[0059] S3: After fully hydrating for 12 hours, add 2-6% anti-high temperature fluid loss reducer and stir for 5 minutes;

[0060] S4: Add 2-6% anti-high temperature and anti-salt fluid loss reducer and stir for 5 minutes;

[0061] S5: Add 1-2% high temperature resistant polymer fluid loss reducer and stir for 10 minutes;

[0062] S6: Add 2-5% blocking and anti-slumping agent and stir for 5 minutes;

[0063] S7: Add 0.5-1% mud shale inhibitor and stir for 5 minutes;

[0064] S8: Add 5-15% potassium chloride and stir for 5 minutes;

[0065] S9: ...

Embodiment 3

[0075] A method for preparing a high-performance water-based drilling fluid for strong plugging and hydrophobic ultra-deep wells, such as figure 1 , Figure 6 As shown, in order to facilitate shock absorption during stirring; this embodiment makes the following improvements on the basis of embodiment 2: a shock-absorbing base 6 is detachably installed on the bottom of the mixing tank 1, and the shock-absorbing base 6 includes a first seat body 29 and the second seat body 31, the first seat body 29 is installed above the second seat body 31 through a shock absorbing spring 33, the outer wall of the top circumference of the first seat body 29 is welded with a shape adapted to the shape of the bottom side wall of the mixing tank 1 The limit bracket 30, the outer wall of the bottom of the second seat body 31 is welded with a uniform part of the support leg 32; by setting the first seat body 29, the second seat body 31 and the shock absorbing spring 33 and other structures, it can ...

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Abstract

The invention discloses a strong-plugging hydrophobic ultra-deep well high-performance water-based drilling fluid and a preparation method thereof, relates to the technical field of drilling fluid preparation, and aims to improve the anti-collapse performance and the anti-pollution performance. The drilling fluid comprises a main raw material and an auxiliary raw material; and the main raw materials comprise 2-5% of bentonite, 0.5-1% of an alkaline regulator, 2-6% of a high-temperature-resistant filtrate reducer and 2-6% of a high-temperature-resistant salt-resistant filtrate reducer. The preparation method of the drilling fluid comprises the following steps that quantitative tap water is taken at room temperature, and added into stirring equipment; and the stirring equipment is controlled to work, and 0.5-1% of an alkaline regulator and 2-5% of bentonite are added according to the proportion and evenly stirred. According to the drilling fluid, the composite salt and the polyamine inhibitor are introduced on the basis of an original polysulfonate drilling fluid system, the inhibition performance of the drilling fluid is further enhanced, the rolling recovery rate of the drilling fluid reaches 90% or above, and the stability of a well wall is effectively maintained for a mudstone development stratum.

Description

technical field [0001] The invention relates to the technical field of drilling fluid preparation, in particular to a high-performance water-based drilling fluid for strong plugging and hydrophobic ultra-deep wells and a preparation method thereof. Background technique [0002] With the deepening of the exploration and development of the Shunbei oil and gas field, the difficulty of drilling construction has increased due to multiple problems in the peripheral new areas: the wellbore stability problems still exist in the Triassic, Permian, Carboniferous, and Silurian; The strata of the Devonian, the Silurian, and the Sangtamu Formation have water and CO 2 This situation has led to the deterioration of the drilling fluid pollution performance, threatened the drilling safety, seriously restricted the progress of the speed and efficiency improvement of the Shunbei Oilfield, and put forward new requirements for the drilling fluid technology. The conventional polysulfide anti-slu...

Claims

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Application Information

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IPC IPC(8): C09K8/24C09K8/035B01F27/90B01F27/118B01F27/84B01F33/80B01F35/32B01F35/43B01F35/71B01F35/60
CPCC09K8/24C09K8/035
Inventor 班国钟成兵付均袁俊文贺春明黄华东雷敏胡永锋黄丽敏
Owner SINOPEC JIANGHAN OILFIELD SERVICE CORP
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