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Formula and preparation method of 200 DEG C temperature and salt resistant drilling fluid with strong inhibition and high density

A high-density, strong suppression technology, applied in the field of oil drilling and drilling fluids, can solve the problems of low solid phase capacity, large filtration loss, poor anti-pollution performance, etc.

Inactive Publication Date: 2011-10-12
CNPC BOHAI DRILLING ENG
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  • Abstract
  • Description
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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 200°C, so as to meet the needs of drilling fluids for drilling complex salt layers in deep wells with a temperature of 200°C, and to overcome high-density drilling fluids. 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 and preparation method of 200 DEG C temperature and salt resistant drilling fluid with strong inhibition and high density

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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, 22kg / m 3 Filtrate reducer A, 80kg / m 3 Filtrate reducer B, 80kg / m 3 Inhibiting anti-slump agent, 60kg / m 3 Inhibit lubricant, 1000kg / m 3 Strong inhibition of high-density water-soluble weighting agent, 580kg / 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 selected from 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-t...

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, 22kg / m 3 Filtrate reducer A, 80kg / m 3 Filtrate reducer B, 80kg / m 3 Inhibiting anti-slump agent, 60kg / m 3 Inhibit lubricant, 1000kg / m 3 Strong inhibition of high density water-soluble weighting agent, 1260kg / 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, 22kg / m 3 Filtrate reducer A, 80kg / m 3 Filtrate reducer B, 80kg / m 3 Inhibiting anti-slump agent, 60kg / m 3 Inhibit lubricant, 1000kg / m 3 Strongly suppressed high-density water-soluble weighting agent, 2545kg / 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-tem...

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Abstract

The invention relates to a formula and preparation method of a 200 DEG C temperature and salt resistant drilling fluid with strong inhibition and high density. The formula is characterized in that in the formula, a high temperature salt resistant shear strength improving agent is a silicate modified substance; fluid loss additives A and B are products with carbon-carbon chains main chains and sulfonic acid groups, pyrrolidone groups or alkane groups as branched chains; an inhibiting / anti-collapse agent is a modified natural vegetable pitch derivative with a high softening point; an inhibiting / lubricating agent is a high polymer nonionic surfactant; and a water soluble heavy weight additive is a compound of low carbon organic acid salts of alkali metals, organic acid ammonium and organic acid quaternary ammonium. The preparation method is characterized by successively adding corresponding components with determined concentrations to the fresh water at a certain stirring speed according to the formula, thus obtaining the drilling fluid. The formula and the preparation method have the following beneficial effect: the problems of difficulty in control of viscosity, high fluid loss, low solid phase capacity and poor pollution resistance of the drilling fluid with high density are solved.

Description

technical field [0001] The invention relates to a formula and preparation method of a high-density and salt-resistant drilling fluid with strong inhibition and temperature resistance of 200°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 drilling fluids for oil drilling. 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 f...

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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