An ultra-high-density environment-friendly gas-to-oil synthetic base drilling fluid and its preparation method

An ultra-high-density, gas-to-oil technology, applied in the field of drilling fluids, can solve the problems of difficult filtration and wall-building, poor environmental protection and other problems, and achieve good filtration and wall-building, low plastic viscosity, and good temperature resistance. Effect

Active Publication Date: 2021-11-09
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the object of the present invention is to provide an ultra-high-density environment-friendly gas-to-oil synthetic base drilling fluid and its preparation method. The gas-to-oil synthetic base drilling fluid has good rheological properties under high temperature and high pressure conditions, and meets Deep and ultra-deep wells require drilling fluid density to meet the environmental protection requirements of various regions, so as to solve the problems of poor environmental protection of conventional oil-based drilling fluids and difficulties in controlling rheology and filtration loss under high density conditions.

Method used

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  • An ultra-high-density environment-friendly gas-to-oil synthetic base drilling fluid and its preparation method
  • An ultra-high-density environment-friendly gas-to-oil synthetic base drilling fluid and its preparation method
  • An ultra-high-density environment-friendly gas-to-oil synthetic base drilling fluid and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] This example provides an ultra-high-density environment-friendly gas-to-oil synthetic base drilling fluid, which includes the following components:

[0036] Gas-to-oil is calculated as 70 parts by volume;

[0037] 26wt% calcium chloride aqueous solution is 30 parts by volume;

[0038] Described organic soil is 2.3% by mass volume ratio;

[0039] Described emulsifier is 5.5% by mass volume ratio;

[0040] Described calcium oxide is 4% by mass volume ratio;

[0041] The first fluid loss reducer is 2.4% by mass volume ratio;

[0042] The second fluid loss reducer is 2.1% by mass volume ratio;

[0043]The addition of the barite is 214% according to the density of the drilling fluid in terms of mass volume ratio,

[0044] Specifically, the added amount of barite is obtained according to the calculation formula of drilling fluid weighting material, the formula is: W=V slurry×ρ3×(ρ2-ρ1) / (ρ3-ρ2)

[0045] Among them, W-the addition of weighting material; V slurry-the volum...

Embodiment 2

[0059] This example provides an ultra-high-density environment-friendly gas-to-oil synthetic base drilling fluid, which includes the following components:

[0060] Gas-to-oil is calculated as 85 parts by volume;

[0061] 30wt% calcium chloride aqueous solution is 15 parts by volume;

[0062] Described high-efficiency organic soil is 2.7% by mass volume ratio;

[0063] Described emulsifier is 5.1% by mass volume ratio;

[0064] Described calcium oxide is 5% by mass volume ratio;

[0065] The first fluid loss reducer is 2.8% by mass volume ratio;

[0066] The second fluid loss reducer is 2.5% by mass volume ratio;

[0067] The addition of the barite is 250% according to the density of the drilling fluid in terms of mass volume ratio;

[0068] Specifically, the added amount of barite is obtained according to the calculation formula of drilling fluid weighting material, the formula is: W=V slurry×ρ3×(ρ2-ρ1) / (ρ3-ρ2)

[0069] Among them, W-the addition of weighting material; V...

Embodiment 3

[0083] This example provides an ultra-high-density environment-friendly gas-to-oil synthetic base drilling fluid, which includes the following components:

[0084] Gas-to-oil is calculated as 85 parts by volume;

[0085] 26wt% sodium chloride aqueous solution is 15 parts by volume;

[0086] Described high-efficiency organic soil is 2.7% by mass volume ratio;

[0087] Described emulsifier is 5.1% by mass volume ratio;

[0088] Described calcium oxide is 5% by mass volume ratio;

[0089] The first fluid loss reducer is 2.8% by mass volume ratio;

[0090] The second fluid loss reducer is 2.5% by mass volume ratio;

[0091] The addition of the barite is 427% according to the density of the drilling fluid in terms of mass volume ratio;

[0092] Specifically, the added amount of barite is obtained according to the calculation formula of drilling fluid weighting material, the formula is: W=V slurry×ρ3×(ρ2-ρ1) / (ρ3-ρ2)

[0093] Among them, V slurry - volume of drilling fluid befo...

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Abstract

The invention discloses an ultra-high-density environment-friendly gas-to-oil synthetic base drilling fluid, which comprises the following components: gas-to-oil is 57%-74% by mass volume, 20wt%-32wt% chloride salt solution by mass The volume fraction is 6.3%-37.8%, the organic soil is 1.5%-3% by mass volume ratio, the emulsifier is 3%-6% by mass volume ratio, and the calcium oxide is 2%-2% by mass volume ratio. 5%, the first fluid loss reducer is 2%-4% by mass volume ratio, the second fluid loss reducer is 1.5%-3.5% by mass volume ratio and barite according to density requirements. The ultra-high-density environment-friendly gas-to-oil synthetic base drilling fluid prepared by the present invention has a maximum density of 2.6g / cm 3 , it has good temperature resistance, lithology, and settlement stability under the condition of this high density; and the ultra-high-density environment-friendly gas-to-oil synthetic base drilling fluid has good filtration loss and wall-building properties, and the high-temperature and high-pressure filtration loss Volume ≤ 1.5mL, filter cake thickness within 1.5mm.

Description

technical field [0001] The invention relates to a drilling fluid, in particular to an ultra-high-density environment-friendly gas-to-oil synthesis base drilling fluid and a preparation method thereof. Background technique [0002] As the recoverable amount of petroleum resources in shallow formations decreases day by day, oil development develops into deep formations, and the number of deep wells and ultra-deep wells drilled continues to increase. Deep wells and ultra-deep wells have high downhole temperature and pressure. During the drilling process, there are high-density drilling fluid rheology and fluid loss wall-building properties that are difficult to control. The formation structure is complex and it is easy to drill high-pressure oil and gas layers, gypsum mudstone and salt water layers, which may easily lead to well collapse. Technical problems such as drill sticking. [0003] Conventional water-based drilling fluids have problems such as large frictional resistan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/36
CPCC09K8/36
Inventor 彭春耀骆小虎刘梅全史凯娇姚如钢丁光波谭学超韦风云焦小光李松张茉楚
Owner BC P INC CHINA NAT PETROLEUM CORP
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