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Method for inhibiting hydration expansion of shale by using mud optimization technique

A mud shale hydration and mud shale technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of toxicity, limited anti-swelling and anti-collapse effect, and high cost

Inactive Publication Date: 2017-05-31
重庆矿产资源开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Potassium-based drilling fluid is adjusted by K + content to change the mud performance, thereby inhibiting the hydration expansion of mud shale, but due to its influence on the logging curve and the actual anti-swelling and anti-collapse effect is limited, it is restricted to a certain extent
Oil-based drilling fluid has excellent anti-slump effect, but it is expensive and has certain toxicity, and its use in places with high environmental protection requirements is subject to certain restrictions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This embodiment includes the following steps:

[0026] Step 1. Add water loss reducing materials to meet the requirement that the API filtration loss of the mud is ≤ 4.0ml, so as to prevent the mud shale from absorbing water, expanding and peeling off to form blocks. The ratio of the water loss reducing materials added to the total mass of the mud is as follows: Fluid loss reducer SPNH: 3%; polyanionic cellulose LV-PAC: 0.5%;

[0027] Step 2. Add mud inhibitor to inhibit the hydration expansion of mud shale and reduce the degree of well wall collapse. The ratio of the mud inhibitor added and its dosage to the total mud mass are as follows: polyamine inhibitor NH-1: 0.5%; methylglucose Glycoside MEG: 3%;

[0028] Step 3. Add plugging and anti-slumping agent to form mud cake on the well wall to maintain the stability of the well wall. The plugging and anti-slumping agent added and the amount of the total mud mass ratio are as follows: nano-emulsified paraffin SDJ-2: 1%; ...

Embodiment 2

[0032] This embodiment includes the following steps:

[0033] Step 1. Add water loss reducing materials to meet the requirement that the API filtration loss of the mud is ≤ 4.0ml, so as to prevent the mud shale from absorbing water, expanding and peeling off to form blocks. The ratio of the water loss reducing materials added to the total mass of the mud is as follows: Fluid loss reducer SPNH: 5%; polyanionic cellulose LV-PAC: 0.8%;

[0034] Step 2. Add mud inhibitor to inhibit the hydration expansion of mud shale and reduce the degree of well wall collapse. The mud inhibitor added and the amount of the total mud mass ratio are as follows: polyamine inhibitor NH-1: 0.8%; methyl glucose Glycoside MEG: 5%;

[0035] Step 3. Add plugging and anti-slumping agent to form mud cake on the well wall to maintain the stability of the well wall. The plugging and anti-slumping agent added and the amount of the total mud mass ratio are as follows: nano-emulsified paraffin SDJ-2: 2%; Aspha...

Embodiment 3

[0039] This embodiment includes the following steps:

[0040] Step 1. Add water loss reducing materials to meet the requirement that the API filtration loss of the mud is ≤ 4.0ml, so as to prevent the mud shale from absorbing water, expanding and peeling off to form blocks. The ratio of the water loss reducing materials added to the total mass of the mud is as follows: Fluid loss reducer SPNH: 3%; polyanionic cellulose LV-PAC: 0.5%;

[0041] Step 2. Add mud inhibitor to inhibit the hydration expansion of mud shale and reduce the degree of well wall collapse. The ratio of the mud inhibitor added and its dosage to the total mud mass are as follows: polyamine inhibitor NH-1: 0.5%; methylglucose Glycoside MEG: 3%;

[0042] Step 3. Add plugging and anti-slumping agent to form mud cake on the well wall to maintain the stability of the well wall. The plugging and anti-slumping agent added and the amount of the total mud mass ratio are as follows: nano-emulsified paraffin SDJ-2: 2%; ...

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PUM

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Abstract

The invention relates to a method for inhibiting the hydration expansion of shale by using a mud optimization technique. The method comprises the following steps: 1, adding a fluid loss reducing material so as to meet the requirement that the reduced mud fluid loss FL is less than or equal to 4.0ml and further prevent the phenomenon that chip off-falling is formed since the shale is peeled off after water swelling; 2, adding a mud inhibitor so as to inhibit the hydration expansion of the shale and reduce the borehole wall collapse degree; 3, adding a blocking anti-collapse agent so as to form mud cakes on a borehole wall and further maintain the stability of the borehole wall; 4, improving the viscous shearing force and cuttings carrying capacity of mud so as to take out the chip off-falling and cuttings in a well and guarantee the cleanness of a borehole and the safety of borehole operation. After the method is used, mud fluid loss is effectively reduced, mud inhibition ability and blocking anti-collapse property are enhanced, the cuttings carrying capacity of the mud is improved, the construction risk of a shale section is greatly reduced, and shale gas well drilling and logging operation are enabled to be safely and smoothly implemented.

Description

technical field [0001] The invention belongs to the new technology of shale gas well drilling technology, in particular to a method for suppressing the hydration expansion of mud shale by utilizing the mud optimization technology. Background technique [0002] With the rapid development of my country's national economy, the demand for energy is increasing day by day, and the dependence on foreign oil and gas is at a high level. In the context of the successful commercial development of shale gas in North America, shale gas, as a clean and efficient green energy, has high hopes in my country's future energy supply. my country's shale gas resources have huge potential. In recent years, shale gas exploration and development have been carried out in stages. Up to now, my country's shale gas development has completed more than 400 shale gas wells of various types. Among them, the Jiaoshiba shale gas field in Fuling , Weiyuan-Changning shale gas field has made a major breakthrough...

Claims

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Application Information

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IPC IPC(8): C09K8/24
CPCC09K8/24C09K2208/12C09K2208/34
Inventor 姚光华王晓泉熊鑫曾强渗谭秀华邓洪军廖金华吴渊周游谢治国陈惠芹董卫军宜伟龚齐森钟学彬张宇蒋明亮张涛陈昌渝
Owner 重庆矿产资源开发有限公司
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