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Glucoheptonate restraining agent for drilling fluid and method for preparing same

A gluconate, drilling fluid technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problem of the deterioration of drilling fluid rheology and wall-building properties, increase the cost of drilling fluid, and the inhibition effect of drilling fluid is not enhanced. and other problems to achieve the effect of inhibiting hydration and dispersion

Inactive Publication Date: 2008-11-26
WESTERN DRILLING KELAMAYI DRILLING TECH INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because a single inorganic salt or organic salt inevitably contains a large number of anions, while increasing the salinity, the real useful cations do not increase, and the inhibitory effect on the drilling fluid is not enhanced, which leads to the rheological change of the drilling fluid. and wall-building deterioration
In order to adjust the performance of the drilling fluid, a large amount of treatment agent must be added, which increases the cost of the drilling fluid

Method used

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  • Glucoheptonate restraining agent for drilling fluid and method for preparing same
  • Glucoheptonate restraining agent for drilling fluid and method for preparing same
  • Glucoheptonate restraining agent for drilling fluid and method for preparing same

Examples

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Effect test

Embodiment 1

[0024] ① Mix 200ml of water with 200g of potato starch (mass ratio 1:1), add 5ml of formic acid, react at 120°C and 0.5MPa for 2 hours, and hydrolyze the starch;

[0025] ② Add 1 g of potassium permanganate to the hydrolyzate and oxidize it at 90°C for 1 h;

[0026] ③ Adjust the pH value of the oxidation product to about 9 with KOH to obtain the gluconate inhibitor for drilling.

[0027] The following is a comparative experiment indoors on the inhibitory effects of a single inorganic salt and the present invention.

[0028] In the solution of the present invention and the KCl solution with a concentration of 15%, add 6 to 10 mesh Xinjiang Xiazijie Bantu granules, roll in heat for 16 hours at 120°C, after cooling, rinse with a 40 mesh screen, and put Put into an oven and weigh after drying at 100°C. Calculate the rolling recovery rate, as shown in Table 1:

[0029] Table 1 solution of the present invention, KCl solution rolling recovery rate

[0030] Solution name ...

Embodiment 2

[0032] ① Mix 200ml of water with 100g of potato starch (mass ratio 1:0.5), add 5ml of nitric acid, react at 120°C and 0.5MPa for 2 hours, and hydrolyze the starch;

[0033] ② Add 1 g of potassium permanganate to the hydrolyzate, and oxidize it at 90°C for 1 hour;

[0034] ③ Adjust the pH value of the oxidation product to about 9 with KOH to obtain the product.

[0035] The following is the performance test of the present invention in drilling fluid.

[0036] The present invention is added to banclay base mud, the rheological property is tested, and its influence on drilling fluid is determined qualitatively. The table below is a comparative experiment to qualitatively evaluate the rheology and inhibition of the present invention relative to KCl. It can be seen from the experimental data that the rheology and inhibition ability of the drilling fluid of the present invention are better than those of KCl. It can be seen from experiments that the present invention can fully mee...

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Abstract

The invention relates to a gluconate inhibitor used by drilling fluid in petroleum drilling and a preparation method thereof. Water and starch is mixed according to the weight ratio of 1: 0.01-2, proper amount of catalyst is added to carry out hydrolysis, and then an oxidizer is added to oxidize the solution and an alkaline finishing agent is used for adjusting to obtain the product. The inhibitor uses metal cations such as K<+>, Ca<2+>, and the like as the inhibiting ions to inhibit the hydration expansion and hydration dispersion of the clay shale; the glucose acid radical anions form protection film on the clay surface through the absorption function between hydroxide radical and the clay surface to prevent the hydration of the clay. The gluconate inhibitor provides for the inhibitive drilling fluid a safe and environment-friendly finishing agent with strong inhibition, lubrication action, no side effects to the performance of the drilling fluid, no negative impacts on the other drilling operation procedures.

Description

technical field [0001] The invention relates to a drilling fluid inhibitor for oil drilling, in particular to a gluconate inhibitor for drilling fluid and a preparation method thereof. Background technique [0002] With the gradual decline of world oil and natural gas reserves and the increasing consumption of oil and gas, oil drilling is becoming more and more difficult. It is mainly manifested in that with the depletion of oil and gas reserves in shallow reservoirs, the exploitation depth of oil wells continues to deepen, the complex formations encountered by drilling increase, and the drilling cost increases greatly. [0003] At present, in the field of oil drilling in the world and in China, the instability of the shale well section wall has always been a technical problem that plagues the drilling technology. Field practice shows that in many difficult wells, the difficulty lies in the inability to well solve the problem of wellbore instability in shale well sections, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035
Inventor 杨玉良黄治中刘志良周天辉马世昌李称心
Owner WESTERN DRILLING KELAMAYI DRILLING TECH INST
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