Formula and preparation method of low-pressure coefficient gas pool reservoir protection drilling fluid

A technology for reservoir protection and low pressure, which is applied in the field of drilling fluid formulation and preparation, can solve problems such as excessive reservoir damage, achieve the effects of protecting reservoirs, increasing liquid phase viscosity, and eliminating reservoir damage

Inactive Publication Date: 2013-10-02
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the problem of excessive reservoir damage caused by drilling fluid leakage

Method used

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  • Formula and preparation method of low-pressure coefficient gas pool reservoir protection drilling fluid
  • Formula and preparation method of low-pressure coefficient gas pool reservoir protection drilling fluid
  • Formula and preparation method of low-pressure coefficient gas pool reservoir protection drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A low pressure coefficient gas reservoir protection drilling fluid formula, the raw materials used include the following substances in mass percentage:

[0047] Support temporary plugging agent 3%;

[0048] Deformed particles 1%;

[0049] Viscosity raising agent 0.1%;

[0050] Filtrate reducer 0.5%;

[0051] Alkalinity control agent 0.1%;

[0052] Preservatives 0.03%;

[0053] Oxygen scavenger 0.5%;

[0054] Corrosion inhibitor 0.1%;

[0055] The balance is water.

[0056]In the present invention, the supporting temporary plugging agent is limestone powder compounded with a particle size of 1250 mesh, 325 mesh and 100 mesh at a ratio of 1:1:1.

[0057] In the present invention, the deformed particles are one of carboxymethyl starch or hydroxypropyl starch or two of them in any proportion.

[0058] In the present invention, the viscosity-increasing agent is one of xanthan gum or high-viscosity polyanionic cellulose or two of them in any proportion.

[0059] In t...

Embodiment 2

[0073] A low pressure coefficient gas reservoir protection drilling fluid formula, the raw materials used include the following substances in mass percentage:

[0074] Support temporary plugging agent 8%;

[0075] Deformed particles 3%;

[0076] Viscosity raising agent 0.3%;

[0077] Filtrate reducer 1.0%;

[0078] Alkalinity control agent 0.3%;

[0079] Preservatives 0.1%;

[0080] Oxygen scavenger 0.8%;

[0081] Corrosion inhibitor 0.5%;

[0082] The balance is water.

[0083] The present invention also includes 3% organic salt as a liquid phase weighting agent and inhibitor, and the organic salt is potassium formate, sodium formate or potassium acetate.

[0084] The present invention also includes lubricant 1.0%, and described lubricant is castor oil borate or castor oil polyoxyethylene ether or soybean oil.

[0085] In the present invention, the supporting temporary plugging agent is limestone powder compounded with a particle size of 1250 mesh, 325 mesh and 100 me...

Embodiment 3

[0102] A low pressure coefficient gas reservoir protection drilling fluid formula, the raw materials used include the following substances in mass percentage:

[0103] Support temporary plugging agent 6%;

[0104] Deformed particles 2%;

[0105] Viscosity raising agent 0.2%;

[0106] Filtrate reducer 0.8%;

[0107] Alkalinity control agent 0.2%;

[0108] Preservatives 0.07%;

[0109] Oxygen scavenger 0.65%;

[0110] Corrosion inhibitor 0.3%;

[0111] The balance is water.

[0112] The present invention also includes 20% organic salt as a liquid phase weighting agent and inhibitor, and the organic salt is potassium formate, sodium formate or potassium acetate.

[0113] The present invention also includes 1.5% lubricant, which is castor oil borate or castor oil polyoxyethylene ether or soybean oil.

[0114] In the present invention, the supporting temporary plugging agent is limestone powder compounded with a particle size of 1250 mesh, 325 mesh and 100 mesh at a ratio o...

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Abstract

The invention discloses a formula and preparation method of low-pressure coefficient gas pool reservoir protection drilling fluid. The drilling fluid formula comprises the following raw materials in percentage by mass: 3-8% of support temporary plugging agent, 1-3% of deformation particles, 0.1-0.3% of viscosity improver, 0.5-1.0% of fluid loss agent, 0.1-0.3% of alkalinity control agent, 0.03-0.1% of preservative, 0.5-0.8% of deoxidant, 0.1-0.5% of corrosion inhibitor and the balance of water. According to the formula disclosed by the invention, without clay, the rheological property is easy to adjust; the formula has the characteristics of adjustable density, low solid phase and strong inhibition; and particularly, a thin and dense barrier zone without permeation or with little permeation is quickly formed in a zone close to the well wall, and the liquid phase and solid phase particles in the drilling (after-drilling) fluid are prevented from further invading the reservoir so as to realize reservoir protection.

Description

technical field [0001] The invention relates to a drilling fluid formula and a preparation method in drilling operations in oil and gas fields, and is particularly suitable for the protection of gas reservoirs with low pressure coefficients in gas fields. Background technique [0002] The Changqing gas field mainly includes three major blocks: the Sulige gas field, the Jingbian gas field and the Changbei gas field. The geological characteristics of the gas pool reservoirs in the Sulige gas field and the Jingbian gas field are that the thickness of a single sand body varies greatly, generally ranging from 5 to 15 m , the physical properties of the reservoir change greatly, the heterogeneity is strong, the well test dynamics reflect that the formation pressure drops rapidly, the pressure recovery is slow, and the supply range of the formation is small. to 0.7-0.9. The main gas reservoir in the Changbei Gas Field is the Upper Paleozoic Permian Shan 2 gas reservoir, which is a ...

Claims

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Application Information

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IPC IPC(8): C09K8/10
Inventor 林海巨满成郑玉辉张振活赵向阳欧阳勇黄占盈崔贵涛陈磊涂海海董海东蒋振伟吴学升高云文王勇茗
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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