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Formula for strong inhibitive high-density salt resistance drilling fluid capable of resisting temperature of 220 DEG C and preparation method of drilling liquid

A high-density, strong suppression technology, applied in the field of oil drilling drilling fluid, can solve the problems of difficult control of drilling fluid viscosity, large filtration loss, and low solid phase capacity.

Inactive Publication Date: 2011-10-12
CNPC BOHAI DRILLING ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a formula and preparation method of a high-density salt-resistant drilling fluid with strong inhibition and temperature resistance of 220 ° C, so as to meet the needs of drilling fluids for drilling complex salt layers when the deep well temperature is 220 ° C, and overcome the high density The drilling fluid viscosity is not easy to control, the fluid loss is large, the solid phase capacity is low, and the anti-pollution performance is poor

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  • Formula for strong inhibitive high-density salt resistance drilling fluid capable of resisting temperature of 220 DEG C and preparation method of drilling liquid

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Experimental program
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Effect test

Embodiment 1

[0019] Embodiment one, according to the drilling fluid formula component 3kg / m 3 Soda ash, 30kg / m 3 High temperature anti-salt cutting agent, 0.5kg / m 3 Flow regulator, 26kg / m 3 Filtrate reducer A, 100kg / m 3 Filtrate reducer B, 110kg / m 3 Inhibiting anti-slump agent, 80kg / m 3 Inhibit lubricant, 1000kg / m 3 Strong inhibition of high density water-soluble weighting agent, 525kg / m 3 Inert weighting agent, each specific component is selected from the components described in the previous technical scheme, wherein the inert weighting agent is barite BaSO 4 ;

[0020] The preparation method of embodiment one, according to the component of above-mentioned drilling fluid formula, take the following steps:

[0021] (1) Measure and calculate the amount of fresh water required to prepare the drilling fluid, at a stirring speed of 12000 rpm, press 3kg / m in fresh water 3 The concentration of soda ash is added, stirred for 10 minutes, and then press 30kg / m 3 Add the high-temperature a...

Embodiment 2

[0027] Embodiment two, according to drilling fluid formula component 3kg / m 3 Soda ash, 30kg / m 3 High temperature anti-salt cutting agent, 0.5kg / m 3Flow regulator, 26kg / m 3 Filtrate reducer A, 100kg / m 3 Filtrate reducer B, 110kg / m 3 Inhibiting anti-slump agent, 80kg / m 3 Inhibit lubricant, 1000kg / m 3 Strong suppression high density water-soluble weighting agent, 1200kg / m 3 Inert weighting agent, each component is selected from the components described in the previous technical scheme, wherein the inert weighting agent is selected from barite BaSO 4 ;

[0028] The preparation method of embodiment two, according to the component of above-mentioned drilling fluid formula, take the following steps:

[0029] (1) Measure and calculate the amount of fresh water required to prepare the drilling fluid, at a stirring speed of 12000 rpm, press 3kg / m in fresh water 3 The concentration of soda ash is added, stirred for 10 minutes, and then press 30kg / m 3 Add the high-temperature an...

Embodiment 3

[0035] Embodiment three, according to drilling fluid formula component 3kg / m 3 Soda ash, 30kg / m 3 High temperature anti-salt cutting agent, 0.5kg / m 3 Flow regulator, 26kg / m 3 Filtrate reducer A, 100kg / m 3 Filtrate reducer B, 110kg / m 3 Inhibiting anti-slump agent, 80kg / m 3 Inhibit lubricant, 1000kg / m 3 Strong inhibition of high density water-soluble weighting agent, 2470kg / m 3 Inert weighting agent, each component is selected from the components described in the previous technical scheme, wherein the inert weighting agent is selected from barite ilmenite powder;

[0036] The preparation method of embodiment three, according to the component of above-mentioned drilling fluid formula, take the following steps:

[0037] (1) Measure and calculate the amount of fresh water required to prepare the drilling fluid, at a stirring speed of 12000 rpm, press 3kg / m in fresh water 3 The concentration of soda ash is added, stirred for 10 minutes, and then press 30kg / m 3 Add the high-...

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Abstract

The invention relates to a formula for a strong inhibitive high-density salt resistance drilling fluid capable of resisting the temperature of 220 DEG C and a preparation method of the drilling liquid; in the formula, a high-temperature salt resistant viscosity enhancer is a silicate modified matter, a fluid loss reducer A and a fluid loss reducer B are main chains which are carbon-carbon chains; branched chains are products of sulfonic group, pyrrolidone group and alkane group; an inhibitive anti-sloughing agent is modified natural plant asphalt derivative with high softening point; an inhibitive lubricating agent is a macromolecule non-ionic surface active agent; and a water soluble weighting agent is a composite comprising low carbon alkali metal organic acid salt, organic acid ammonium and organic acid quaternary ammonium. When the drilling fluid is prepared, the corresponding compositions are sequentially added at a fixed stirring speed and a definite concentration according to the formula so as to obtain the drilling fluid. According to the invention, the problems of uncontrollable viscosity, high filtration loss volume, low solid phase volume and poor pollution resistance performance of the drilling fluid with high density are overcome.

Description

technical field [0001] The invention relates to a formula and a preparation method of a high-density salt-resistant drilling fluid with strong inhibition and temperature resistance of 220°C, which is mainly used to solve the problems encountered in drilling fluids in complex salt layers in ultra-deep well sections, and belongs to the technical field of oil drilling drilling fluids. Background technique [0002] With the development of the oil industry at home and abroad and the increasing demand for oil, the exploration and development of oil and gas fields gradually produce and exploit oil and gas reservoirs with harsh environments. One of the important manifestations is the increase of well depth. Drilling practice shows that with the increase of well depth, drilling technical difficulties gradually increase, and downhole high temperature and high pressure seriously affect the performance of drilling fluid. The main performance is that the viscosity of the drilling fluid i...

Claims

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Application Information

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IPC IPC(8): C09K8/12
Inventor 张民立王伟忠穆剑雷巩兴广马翠雪马运庆田增艳尹丽董殿彬许绍营宁军明
Owner CNPC BOHAI DRILLING ENG
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