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Borehole wall anti-collapse agent for drilling fluid and preparation method thereof

An anti-slump agent and drilling fluid technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of affecting completion operations, affecting drilling speed, economic losses, etc., and achieve good shale inhibition performance, good Prospect of popularization and application, effect of good plugging performance

Active Publication Date: 2020-09-29
CNPC BOHAI DRILLING ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The problem of wellbore instability during drilling has always been a technical problem that needs to be solved urgently. More than 90% of the wellbore instability problems occur in shale formations. Due to the high content of clay minerals in shale formations and strong water sensitivity, they are extremely It is prone to collapse and shrinkage, which not only seriously affects the drilling speed, but also affects the later completion operations (such as well logging, cementing, etc.), and at the same time causes huge economic losses
However, the side effects brought by the increase in the types of treatment agents are that the cost of drilling increases, the performance of drilling fluid is difficult to adjust, and maintenance is difficult

Method used

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  • Borehole wall anti-collapse agent for drilling fluid and preparation method thereof
  • Borehole wall anti-collapse agent for drilling fluid and preparation method thereof
  • Borehole wall anti-collapse agent for drilling fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add 80g of polyether with a molecular weight of 1000 into a 500mL four-necked flask. The main bottle mouth of the four-necked flask is equipped with a mechanical stirrer. One of the bottle mouths is connected to a nitrogen gas inlet pipe, and the other bottle mouth is connected to an air outlet pipe, and the end of the air outlet pipe is inserted into a 10wt .% NaOH aqueous solution is used to absorb the tail gas, and the remaining bottle mouth is connected to the normal pressure dropping funnel for feeding. The starter is prepared by adding ethylene oxide and propylene oxide with a molar ratio of 1:1 after being activated by NaOH;

[0021] Raise the temperature of the water bath to 55°C, then start blowing nitrogen, start the mechanical stirring, slowly add 18.32g of methanesulfonyl chloride dropwise, the dropping time is 40min, then continue stirring at 55°C for 1h, then stop blowing nitrogen, and start to drop slowly Add 4.96g of ethylenediamine, dropwise for 30min, ...

Embodiment 2

[0023] Add 80g of polyether with a molecular weight of 2000 into a 500mL four-necked flask. The main bottle mouth of the four-necked flask is equipped with a mechanical stirrer. One of the bottle mouths is connected to a nitrogen gas inlet pipe, and the other bottle mouth is connected to an air outlet pipe, and the end of the air outlet pipe is inserted into a 10wt The aqueous solution of .% NaOH is used to absorb the tail gas, and the remaining bottle mouth is connected to the normal pressure dropping funnel for feeding, and the four-necked flask is controlled by a water bath to control the reaction temperature; among them, the polyether with a molecular weight of 2000 is made of ethylene glycol. The starter is prepared by adding ethylene oxide and propylene oxide with a molar ratio of 2:3 after being activated by NaOH;

[0024] Raise the temperature of the water bath to 60°C, then start blowing nitrogen, start mechanical stirring, slowly add 9.16g of methanesulfonyl chloride ...

Embodiment 3

[0026] Add 90g of polyether with a molecular weight of 3000 into a 500mL four-necked flask. The main bottle mouth of the four-necked flask is equipped with a mechanical stirrer. One of the bottle mouths is connected to the nitrogen gas inlet pipe, and the other bottle mouth is connected to the air outlet pipe, and the end of the air outlet pipe is inserted into a 10wt The aqueous solution of .% NaOH is used to absorb the tail gas, and the remaining bottle mouth is connected to the normal pressure dropping funnel for feeding. The starter is prepared by adding ethylene oxide and propylene oxide with a molar ratio of 3:2 after being activated by NaOH;

[0027] Raise the temperature of the water bath to 65°C, then start blowing nitrogen, start the mechanical stirring, slowly add 6.87g of methanesulfonyl chloride dropwise, the dropping time is 30min, then continue to stir at 65°C for 1h, then stop blowing nitrogen, and start to drop slowly Add 3.19g of diethylenetriamine, dropwise ...

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Abstract

The invention discloses a well wall collapse-preventing agent for a drilling liquid and a preparation method of the well wall collapse-preventing agent. According to the collapse-preventing agent, polyether prepared from glycol, epoxyethane and epoxypropane and of which the molecular weight is 1000-5000 is used as a raw material, and methanesulfonyl chloride, organic amine, water of which the massis the same as that of the polyether, and sodium hydroxide of which the molar mass is the same as that of the methanesulfonyl chloride are sequentially added under the condition that the temperatureis 55-70 DEG C, so that the collapse-preventing agent is prepared. A synthesis preparation method is simple, the cost is low, and the collapse-preventing agent is suitable for industrial production. The well wall collapse-preventing agent for the drilling liquid, prepared by the method, has favorable blocking properties and shale inhibition properties, the temperature resistance is as high as 220DEG C, and the collapse-preventing agent has good promotion and application prospects in the field of drilling liquid for development of oil fields.

Description

technical field [0001] The invention relates to the technical field of exploration and development of petroleum and natural gas resources, in particular to a well wall anti-collapse agent for drilling fluid and a preparation method thereof. Background technique [0002] The problem of wellbore instability during drilling has always been a technical problem that needs to be solved urgently. More than 90% of the wellbore instability problems occur in shale formations. Due to the high content of clay minerals in shale formations and strong water sensitivity, they are extremely It is prone to collapse and shrinkage, which not only seriously affects the drilling speed, but also affects the later completion operations (such as well logging, cementing, etc.), and at the same time causes huge economic losses. [0003] From the perspective of improving the anti-slump performance of drilling fluid, there are currently several measures: 1. By adding treatment agents to the drilling flu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/035C08G65/338
CPCC08G65/338C09K8/035
Inventor 贾利军郭明红任强任路王绮李勇刘文辉郑占义卢芹
Owner CNPC BOHAI DRILLING ENG