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Environmental friendly drill of acid sodium pyrophosphate and preparing method thereof

A technology of sodium acid pyrophosphate and sodium pyrophosphate, which is applied in the field of drilling operations in oil and gas fields, can solve problems such as insufficient decentralization, and achieve good economic and social benefits, high-efficiency sand-carrying ability, and excellent wellbore stability

Inactive Publication Date: 2017-01-25
CNPC SICHUAN GASOLINEEUM GEOPHYSICAL PROSPECTING ENG TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem in the prior art that the formation conduit and surface casing in the upper part of Ecuador’s TARAPOA block are not in place. Environmental requirements

Method used

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  • Environmental friendly drill of acid sodium pyrophosphate and preparing method thereof
  • Environmental friendly drill of acid sodium pyrophosphate and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] In order to solve the problem in the prior art that the upper formation conduit and surface casing in the TARAPOA block of Ecuador are not properly lowered, this embodiment provides an acid sodium pyrophosphate environment-friendly drilling fluid, which is composed of the following raw materials in mass percentage: Sodium pyrophosphate 2-5%, viscosity enhancer 0.2-1.5%, fluid loss reducer 0.5-2.0%, weighting agent 5-15%, and the balance is water.

[0019] The acid sodium pyrophosphate environment-friendly drilling fluid is prepared under normal temperature and pressure. The preparation process: add the formula amount of sodium pyrophosphate, fluid loss reducer, viscosity increasing agent and weighting agent in the formula amount of water in sequence, and fully stir and mix. Evenly prepared as drilling fluid.

[0020] Principle of the present invention:

[0021] Sodium acid pyrophosphate is used as the main component. Compared with conventional viscosity reducers such a...

Embodiment 2

[0023] On the basis of Example 1, this example provides an acid sodium pyrophosphate environment-friendly drilling fluid, which is composed of the following raw materials in mass percentage: sodium pyrophosphate 5%, viscosity increasing agent 0.8%, fluid loss reducer 0.5% %, weighting agent 5%, water 88.7%.

[0024] Preparation method: add sodium pyrophosphate, fluid loss reducer, viscosity raising agent and weighting agent in the prescribed amount of water in sequence, stir well and mix uniformly to prepare drilling fluid.

[0025] The sodium pyrophosphate (main agent) in this example is food-grade sodium pyrophosphate, the fluid loss control agent is starch, the viscosity increasing agent is high-viscosity polyanionic cellulose, and the weighting agent is barite.

Embodiment 3

[0027] On the basis of Example 1, this example provides an acid sodium pyrophosphate environment-friendly drilling fluid, which is composed of the following raw materials in mass percentage: sodium pyrophosphate 2%, viscosity increasing agent 1.3%, fluid loss reducer 0.5% %, weighting agent 5%, and the balance is water.

[0028] Preparation method: add sodium pyrophosphate, fluid loss reducer, viscosity raising agent and weighting agent in the prescribed amount of water in sequence, stir well and mix uniformly to prepare drilling fluid.

[0029] The sodium pyrophosphate (main agent) in this example is food-grade sodium pyrophosphate, the fluid loss reducer is low-viscosity polyanionic cellulose, and the viscosity-raising agent is made of 0.3% xanthan gum (relative molecular mass is 2×10 6 ~2×10 7 ) and 1% bentonite, and the weighting agent is 325 mesh limestone.

[0030] 1. Test performance experiment

[0031] According to the testing standard of drilling fluid recommended ...

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Abstract

The invention provides an environmental friendly drill of acid sodium pyrophosphate, composed of the following raw materials, by weight: 2-5% of sodium pyrophosphate, 0.2-1.5% of adhesive, 0.5-2.0% of filtrate reducer, 5-15% of weighting agent and water. The environmental friendly drill liquid of acid sodium pyrophosphate can not only provide excellent drill wall stabilizing ability, but also provide efficient sand-carrying capacity, and conforms to requirements for environmental protection, meets demands for upper drill section on Ecuador TARAPOA block, and gains good economic benefit and social benefit.

Description

technical field [0001] The invention belongs to the technical field of drilling operations in oil and gas fields, and in particular relates to an environment-friendly sodium acid pyrophosphate drilling fluid and a preparation method thereof. Background technique [0002] In the TARAPOA block of Ecuador, the ground elevation is 250-300 meters, the terrain is mostly hilly, and the formation pressure and temperature are normal. It belongs to the Cenozoic marine environment deposition, and the main strata are Late Tertiary, Tertiary, and Cretaceous. Both Late Tertiary and Tertiary are relatively new formations with high shale content, short deposition time, undercompaction, poor stability, strong water absorption, high dispersion, and severe slurry formation. [0003] In the TARAPOA block of Ecuador, five to ten wells are usually drilled in a "line" row on the same well pad, and new wells and old wells are interlaced among them, all of which are highly deviated directional wells...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/10
CPCC09K8/10
Inventor 李宝军崔贵涛蒋振伟贾俊苏欢赵向阳赵雷丁磊高洁张艺聪曲先伟
Owner CNPC SICHUAN GASOLINEEUM GEOPHYSICAL PROSPECTING ENG TECH RES INST
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