A kind of water-based drilling fluid suitable for salt-gypsum layer and preparation method thereof

A water-based drilling fluid and salt-gypsum layer technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of drilling fluid anti-calcium ion pollution, etc., and achieve excellent plugging performance, excellent suppression, and anti-pollution good performance

Active Publication Date: 2021-06-18
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

[0010] In order to overcome the problems of dissolution and creep of salt layers, water absorption and swelling of anhydrite, mudstone expansion and dispersion, slurry collapse, plugging of drilling fluid, and anti-calcium ion pollution, the present invention provides a water-based drilling fluid suitable for salt-gypsum layers and its preparation method, one of the purposes of the present invention is to have excellent inhibition and anti-slump performance on the salt-gypsum layer, and effectively solve the problem of well wall stability and loss of return lost circulation caused by dissolution creep of large-section salt-gypsum layer and salt rock collapse. and other technical problems

Method used

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  • A kind of water-based drilling fluid suitable for salt-gypsum layer and preparation method thereof
  • A kind of water-based drilling fluid suitable for salt-gypsum layer and preparation method thereof
  • A kind of water-based drilling fluid suitable for salt-gypsum layer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] In order to overcome the problems of dissolution and creep of salt layers, water absorption and swelling of anhydrite, mudstone expansion and dispersion, slurry collapse, plugging of drilling fluid, and anti-calcium ion pollution, the present invention provides a water-based drilling fluid suitable for salt-gypsum layers and its preparation method, one of the purposes of the present invention is to have excellent inhibition and anti-slump performance on the salt-gypsum layer, and effectively solve the problem of well wall stability and loss of return lost circulation caused by dissolution creep of large-section salt-gypsum layer and salt rock collapse. and other technical problems.

[0046] The second object of the present invention is to meet the urgent needs of the Ordovician, Cambrian and Changchengian oil and gas reservoir exploration and development in the Ordos Basin for the production of water-based drilling fluids suitable for salt-gypsum formations.

[0047] Th...

Embodiment 2

[0071] A water-based drilling fluid suitable for salt-gypsum layers consists of the following components by weight percentage:

[0072] Sodium chloride 23.0%;

[0073] Tackifier 0.5%;

[0074] Fluid loss additive 2.0%;

[0075] Plugging agent 1.0%;

[0076] Sodium hydroxide 0.1%;

[0077] Soda ash 0.5%;

[0078] Ion complexing agent 0.1%;

[0079] Bentonite powder 2.0%;

[0080] Barite 5%;

[0081] The balance is water.

[0082] The blocking agent is a polymer synthesized by butadiene, styrene and 2-acrylamido-2-methylpropanesulfonic acid, and the mass percent of the three is butadiene: styrene: 2-acrylamide- 2-Methylpropanesulfonic acid=3:1:1.

[0083] The thickener is one of polyanionic cellulose PAC-HV and carboxymethyl cellulose CMC-HV or a mixture of two of them.

[0084] The fluid loss control agent is one or a mixture of sulfonated phenolic resin type II, polyanionic cellulose PAC-LV, and carboxymethyl cellulose CMC-LV.

[0085] The ion-complexing agent is et...

Embodiment 3

[0090] A water-based drilling fluid suitable for salt-gypsum layers consists of the following components by weight percentage:

[0091] Sodium chloride 25.0%;

[0092] Tackifier 1.5%;

[0093] Fluid loss additive 10.0%;

[0094] Plugging agent 2.0%;

[0095] Sodium hydroxide 0.3%;

[0096] Soda ash 3.0%;

[0097] Ion complexing agent 0.3%;

[0098] Bentonite powder 3.0%;

[0099] Barite 15%;

[0100] The balance is water.

[0101] The blocking agent is a polymer synthesized by butadiene, styrene and 2-acrylamido-2-methylpropanesulfonic acid, and the mass percent of the three is butadiene: styrene: 2-acrylamide- 2-Methylpropanesulfonic acid=3:1:1.

[0102] The thickener is one of polyanionic cellulose PAC-HV and carboxymethyl cellulose CMC-HV or a mixture of two of them.

[0103] The fluid loss control agent is one or a mixture of sulfonated phenolic resin type II, polyanionic cellulose PAC-LV, and carboxymethyl cellulose CMC-LV.

[0104] The ion-complexing agent is ...

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Abstract

The invention provides a water-based drilling fluid suitable for a salt-gypsum layer and a preparation method thereof. The water-based drilling fluid includes the following components in mass percentages: 23.0-26.0% of sodium chloride; 0.5-3.0% of a viscosifier; Filtrate reducer 2.0-15.0%; plugging agent 1.0-3.0%; sodium hydroxide 0.1-0.5%; soda ash 0.5-5.0%; ion complexing agent 0.1-0.5%; bentonite powder 2.0-5.0%; barite 5~30%; the balance is water. The water-based drilling fluid prepared by the present invention has excellent inhibition and anti-slump performance on the salt-gypsum layer, and effectively solves the problem of well wall instability and lost circulation caused by dissolution creep of large-section salt-gypsum layer and salt rock collapse and other technical problems. It has been successfully applied in the Ordovician, Cambrian and Changchengian formations in the Ordos Basin, meeting the needs of exploration and development of deep unconventional oil and gas reservoirs in the Ordos Basin.

Description

technical field [0001] The invention relates to a water-based drilling fluid suitable for salt-gypsum layers and a preparation method thereof, which have excellent inhibition and anti-slump performance on the salt-gypsum layers, and effectively solve the problems caused by the dissolution and creep of large sections of salt-gypsum layers and the collapse of salt rocks. technical problems such as wall stability and loss of return lost circulation. It has been successfully applied in the exploration and development of Ordovician, Cambrian and Changchengian formations in the Ordos Basin. Background technique [0002] With the large-scale development of unconventional gas reservoirs at home and abroad, the drilling of deep complex oil and gas resources is becoming more and more extensive. Taking the Ordos Basin as an example, the layers drilled and exploited in the past were all strata above the Ordovician. Because the Ordovician and its lower Cambrian and Changchengian strata...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/03C09K8/514
CPCC09K8/03C09K8/514
Inventor 王京光金祥哲赵海锋郭康张长庚王国庆杨斌寄晓宁丁磊王勇强涂海海郭永鹏高洁刘婷婷曹辉曲先伟张建斌尹敬军彭元超段成才李慧升武自博
Owner BC P INC CHINA NAT PETROLEUM CORP
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