Cationic alkyl glycoside soilless phase drilling fluid

Abstract

The invention provides a cationic alkyl glycoside soilless phase drilling fluid. The cationic alkyl glycoside soilless phase drilling fluid is prepared from the following components: 3 to 8 parts of cationic alkyl glycoside, 0.2 to 0.5 part of a coating agent, 0.2 to 0.8 part of a tackifier, 0.5 to 1 part of a filtrate reducer, 0.8 to 1.5 parts of a lubricant, 0.3 to 1.5 parts of a pH regulator, 2 to 3 parts of a reservoir protective agent, 1 to 2 parts of a weighting agent and the balance of water. The cationic alkyl glycoside soilless phase drilling fluid provided by the invention has the advantages of strong anti-sloughing inhibition property, facilitation of mudstone section anti-sloughing and borehole wall stability, excellent rheological property, good rock debris pollution resistance, improvement of the viscosity and shearing force of the drilling fluid, effective improvement of the rock debris carrying capacity of the drilling fluid, and improvement of the drilling efficiency. The lubricating capacity of the drilling fluid is also improved, drill jamming is prevented, the frictional resistance of the drilling fluid is reduced, the plugging capacity of the drilling fluid is enhanced, and the defoaming agent is arranged to reduce bubbles and reduce the influence of the bubbles on the plugging effect of the drilling fluid.

Description

Technical Field

[0001] The invention relates to the field of drilling fluid, in particular to a cationic alkyl polyglycoside soil-free drilling fluid. Background Art

[0002] With the increasing depletion of oil and gas resources, deep horizontal well drilling has gradually become an important technical means to develop deep oil and gas reservoirs. Due to the deep burial depth of oil and gas reservoirs and the deep inclination point, there is high friction and torque in the inclination section and horizontal section of deep horizontal wells during drilling, which not only seriously affects the drilling speed and wellbore trajectory control, but also threatens the safety of drilling operations. It is the core problem that restricts the extension length of the horizontal section of deep horizontal wells, which puts forward higher requirements on the lubrication performance of drilling fluids.

[0003] Alkyl polyglycoside drilling fluid has good lubricity, but its inhibition needs to be improved, and it cannot effectively solve the problem of wellbore instability in horizontal mudstone. Moreover, the amount of addition is large, the cost is high, and the molecular temperature resistance is relatively poor. The above shortcomings limit its further application and promotion in drilling fluid. In the current oil and gas exploration and development process, the wellbore instability problem of long horizontal mudstone and sandstone and other easily collapsed formations needs to be solved urgently. Under this situation, it has become a general trend to carry out research on modified alkyl polyglycosides.

[0004] Therefore, it is necessary to provide a cationic alkyl polyglycoside soil-free drilling fluid to solve the above technical problems. Summary of the invention

[0005] The invention provides a cationic alkyl polyglycoside soil-free drilling fluid, which solves the problems in the background technology.

[0006] In order to solve the above technical problems, the cationic alkyl polyglycoside soil-free drilling fluid provided by the present invention comprises the following component groups:

[0007] 3-8 parts of cationic alkyl polyglycoside, 0.2-0.5 parts of coating agent, 0.2-0.8 parts of viscosity enhancer, 0.5-1 parts of fluid loss reducer, 0.8-1.5 parts of lubricant, 0.3-1.5 parts of pH adjuster, 2-3 parts of reservoir protective agent, 1-2 parts of weighting agent, and the balance is water.

[0008] Preferably, the coating agent is partially hydrolyzed polyacrylamide.

[0009] Preferably, the viscosity increasing agent is one or more of xanthan gum and hydroxypropyl guar gum.

[0010] Preferably, the fluid loss reducer is one or more of modified starch and polyanionic cellulose.

[0011] Preferably, the pH regulator is one or more of sodium hydroxide and sodium carbonate.

[0012] Preferably, the lubricant is one or more of graphite and polyol.

[0013] Preferably, the reservoir protection agent is one or more of ultrafine calcium carbonate, one-way pressure shielding temporary plugging agent, and oil film temporary plugging agent.

[0014] Preferably, the weighting agent is selected from one or more of iron ore powder, calcium carbonate powder, barite, hematite, and galena powder.

[0015] Preferably, the composition further comprises: 0.2-0.4 parts of a bactericide and 0.4-1 parts of a defoamer, wherein the bactericide is glutaraldehyde or a quaternary ammonium salt, and the defoamer is a combination of polyether, silicone, and polyether-modified silicone.

[0016] Preferably, the cationic alkyl polyglycoside soil-free drilling fluid needs to use a preparation method of the cationic alkyl polyglycoside soil-free drilling fluid during its preparation, and the method comprises the following steps:

[0017] S1. Put a certain volume of clean water into the slurry preparation tank, add the cationic alkyl polyglycoside, coating agent, viscosity enhancer, fluid loss reducer, reservoir protection agent and weighting agent into the clean water in sequence, and stir and mix them evenly;

[0018] S2, adding a pH adjuster to the mixed solution prepared in S1 for neutralization, then adding a bactericide and a defoamer, and stirring and mixing thoroughly;

[0019] S3, adding lubricant to the mixed liquid prepared in S2, and finally preparing cationic alkyl polyglycoside soil-free drilling fluid.

[0020] Compared with the related art, the cationic alkyl polyglycoside soil-free drilling fluid provided by the present invention has the following advantages:

[0021] Beneficial effects:

[0022] The invention provides a cationic alkyl polyglycoside soil-free drilling fluid. The drilling fluid formula of the invention has strong anti-collapse inhibition, is beneficial to the anti-collapse of mudstone sections and the stability of well walls, has excellent rheological properties, and has good anti-rock cuttings pollution capability, improves the viscosity and shear force of the drilling fluid, enables the drilling fluid to effectively improve the ability to carry rock cuttings, and also improves the lubrication capability of the drilling fluid, prevents drill sticking, reduces the friction resistance of the drilling fluid, and enhances the plugging capability of the drilling fluid. A defoamer is provided to reduce bubbles and reduce the influence of bubbles on the plugging effect of the drilling fluid, and a hydrate inhibitor reduces the generation of hydrates, and appropriately reduces the dispersion and viscosity of the drilling fluid, so that the drilling fluid has suitable rheological properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The present invention provides a schematic diagram of the process for preparing the cationic alkyl polyglycoside soil-free drilling fluid. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings and implementation modes.

[0025] Please refer to Figure 1 ,in, Figure 1 The present invention provides a schematic diagram of the process for preparing the cationic alkyl polyglycoside soil-free drilling fluid.

[0026] Example 1: Cationic alkyl polyglycoside soil-free drilling fluid comprises the following component groups:

[0027] 3 parts of cationic alkyl polyglycoside, 0.2 parts of coating agent, 0.2 parts of viscosity enhancer, 0.5 parts of fluid loss reducer, 0.8 parts of lubricant, 0.3 parts of pH adjuster, 2 parts of reservoir protection agent, 1 part of weighting agent, and the balance is water.

[0028] The coating agent is partially hydrolyzed polyacrylamide, which can wrap the cuttings to prevent them from dispersing and maintain the stability of the performance of the drilling fluid.

[0029] The viscosity increasing agent is one or more of xanthan gum and hydroxypropyl guar gum.

[0030] The fluid loss reducer is one or more of modified starch and polyanionic cellulose, which reduces the fluid loss of drilling fluid, prevents the drilling fluid from excessively penetrating into the formation, and maintains the stability of the well wall.

[0031] The pH regulator is one or more of sodium hydroxide and sodium carbonate.

[0032] The lubricant is one or more of graphite and polyol, which can reduce the friction resistance between the drilling tool and the well wall, reduce the torque and energy consumption, and protect the drilling tool.

[0033] The reservoir protective agent is one or more of ultrafine calcium carbonate, one-way pressure shielding temporary plugging agent, and oil film temporary plugging agent.

[0034] The weighting agent is selected from one or more of iron ore powder, calcium carbonate powder, barite, hematite, and galena powder.

[0035] It also includes: 0.2 parts of bactericide and 0.4 parts of defoamer, wherein the bactericide is glutaraldehyde or quaternary ammonium salt, and the defoamer is a combination of polyether, silicone and polyether modified silicone.

[0036] Bactericides can prevent the growth of bacteria in drilling fluids during use, which can lead to deterioration of performance; defoamers can eliminate the foam generated during the mixing and circulation of drilling fluids, ensuring the stability of drilling fluid performance and the safety of drilling operations.

[0037] Example 2: Cationic alkyl polyglycoside soil-free drilling fluid comprises the following component groups:

[0038] 3 parts of cationic alkyl polyglycoside, 0.3 parts of coating agent, 0.5 parts of viscosity enhancer, 0.5 parts of fluid loss reducer, 1 part of lubricant, 0.5 parts of pH adjuster, 2 parts of reservoir protective agent, 1 part of weighting agent, and the balance is water.

[0039] The coating agent is partially hydrolyzed polyacrylamide.

[0040] The viscosity increasing agent is one or more of xanthan gum and hydroxypropyl guar gum.

[0041] The fluid loss reducer is one or more of modified starch and polyanionic cellulose.

[0042] The pH regulator is one or more of sodium hydroxide and sodium carbonate.

[0043] The lubricant is one or more of graphite and polyol.

[0044] The reservoir protective agent is one or more of ultrafine calcium carbonate, one-way pressure shielding temporary plugging agent, and oil film temporary plugging agent.

[0045] The weighting agent is selected from one or more of iron ore powder, calcium carbonate powder, barite, hematite, and galena powder.

[0046] The invention also comprises: 0.2 parts of a bactericide and 0.6 parts of a defoamer, wherein the bactericide is glutaraldehyde or a quaternary ammonium salt, and the defoamer is a composition of polyether, organic silicon, and polyether-modified silicon.

[0047] Example 3: Cationic alkyl polyglycoside soil-free drilling fluid comprises the following component groups:

[0048] 5 parts of cationic alkyl polyglycoside, 0.4 parts of coating agent, 0.5 parts of viscosity enhancer, 1 part of fluid loss reducer, 1.3 parts of lubricant, 1 part of pH adjuster, 2.2 parts of reservoir protective agent, 2 parts of weighting agent, and the balance is water.

[0049] The coating agent is partially hydrolyzed polyacrylamide.

[0050] The viscosity increasing agent is one or more of xanthan gum and hydroxypropyl guar gum.

[0051] The fluid loss reducer is one or more of modified starch and polyanionic cellulose.

[0052] The pH regulator is one or more of sodium hydroxide and sodium carbonate.

[0053] The lubricant is one or more of graphite and polyol.

[0054] The reservoir protective agent is one or more of ultrafine calcium carbonate, one-way pressure shielding temporary plugging agent, and oil film temporary plugging agent.

[0055] The weighting agent is selected from one or more of iron ore powder, calcium carbonate powder, barite, hematite, and galena powder.

[0056] It also includes: 0.4 parts of bactericide and 0.8 parts of defoamer, wherein the bactericide is glutaraldehyde or quaternary ammonium salt, and the defoamer is a combination of polyether, silicone and polyether modified silicone.

[0057] Example 4: Cationic alkyl polyglycoside soil-free drilling fluid comprises the following component groups:

[0058] 8 parts of cationic alkyl polyglycoside, 0.5 parts of coating agent, 0.8 parts of viscosity enhancer, 1 part of fluid loss reducer, 1.5 parts of lubricant, 1.5 parts of pH adjuster, 3 parts of reservoir protective agent, 2 parts of weighting agent, and the balance is water.

[0059] The coating agent is partially hydrolyzed polyacrylamide.

[0060] The viscosity increasing agent is one or more of xanthan gum and hydroxypropyl guar gum.

[0061] The fluid loss reducer is one or more of modified starch and polyanionic cellulose.

[0062] The pH regulator is one or more of sodium hydroxide and sodium carbonate.

[0063] The lubricant is one or more of graphite and polyol.

[0064] The reservoir protective agent is one or more of ultrafine calcium carbonate, one-way pressure shielding temporary plugging agent, and oil film temporary plugging agent.

[0065] The weighting agent is selected from one or more of iron ore powder, calcium carbonate powder, barite, hematite, and galena powder.

[0066] It also includes: 0.4 parts of bactericide and 1 part of defoamer, wherein the bactericide is glutaraldehyde or quaternary ammonium salt, and the defoamer is a combination of polyether, silicone and polyether modified silicone.

[0067] The cationic alkyl polyglycoside soil-free drilling fluid needs to use a preparation method of the cationic alkyl polyglycoside soil-free drilling fluid during its preparation, and the method comprises the following steps:

[0068] S1. Put a certain volume of clean water into the slurry preparation tank, add the cationic alkyl polyglycoside, coating agent, viscosity enhancer, fluid loss reducer, reservoir protection agent and weighting agent into the clean water in sequence, and stir and mix them evenly;

[0069] S2, adding a pH adjuster to the mixed solution prepared in S1 for neutralization, then adding a bactericide and a defoamer, and stirring and mixing thoroughly;

[0070] S3, adding lubricant to the mixed liquid prepared in S2, and finally preparing cationic alkyl polyglycoside soil-free drilling fluid.

[0071] Compared with the related art, the cationic alkyl polyglycoside soil-free drilling fluid provided by the present invention has the following advantages:

[0072] Beneficial effects:

[0073] The drilling fluid formula of the present invention has strong anti-collapse inhibition, is beneficial to the anti-collapse of mudstone sections and the stability of the wellbore wall, has excellent rheological properties, and has good anti-rock cuttings pollution ability, improves the viscosity and shear force of the drilling fluid, so that the drilling fluid can effectively improve the ability to carry rock cuttings, and also improves the lubrication ability of the drilling fluid, prevents drill sticking, reduces the friction resistance of the drilling fluid, and enhances the plugging ability of the drilling fluid. A defoamer is provided to reduce bubbles and reduce the influence of bubbles on the plugging effect of the drilling fluid, and a hydrate inhibitor reduces the generation of hydrates, and moderately reduces the dispersion and viscosity of the drilling fluid, so that the drilling fluid has suitable rheological properties.

[0074] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A cationic alkyl polyglycoside soil-free drilling fluid, characterized in that: The following ingredient groups are included: 3-8 parts of cationic alkyl polyglycoside, 0.2-0.5 parts of coating agent, 0.2-0.8 parts of viscosity enhancer, 0.5-1 parts of fluid loss reducer, 0.8-1.5 parts of lubricant, 0.3-1.5 parts of pH adjuster, 2-3 parts of reservoir protective agent, 1-2 parts of weighting agent, and the balance is water.

2. The cationic alkyl polyglycoside soil-free drilling fluid according to claim 1, characterized in that: The coating agent is partially hydrolyzed polyacrylamide.

3. The cationic alkyl polyglycoside soil-free drilling fluid according to claim 1, characterized in that: The viscosity increasing agent is one or more of xanthan gum and hydroxypropyl guar gum.

4. The cationic alkyl polyglycoside soil-free drilling fluid according to claim 1, characterized in that: The fluid loss reducer is one or more of modified starch and polyanionic cellulose.

5. The cationic alkyl polyglycoside soil-free drilling fluid according to claim 1, characterized in that: The pH regulator is one or more of sodium hydroxide and sodium carbonate.

6. The cationic alkyl polyglycoside soil-free drilling fluid according to claim 1, characterized in that: The lubricant is one or more of graphite and polyol.

7. The cationic alkyl polyglycoside soil-free drilling fluid according to claim 1, characterized in that: The reservoir protective agent is one or more of ultrafine calcium carbonate, one-way pressure shielding temporary plugging agent, and oil film temporary plugging agent.

8. The cationic alkyl polyglycoside soil-free drilling fluid according to claim 1, characterized in that: The weighting agent is selected from one or more of iron ore powder, calcium carbonate powder, barite, hematite, and galena powder.

9. The cationic alkyl polyglycoside soil-free drilling fluid according to claim 1, characterized in that: Also includes: 0.2-0.4 parts of bactericide and 0.4-1 parts of defoamer, wherein the bactericide is glutaraldehyde or quaternary ammonium salt, and the defoamer is a combination of polyether, silicone, and polyether modified silicone.

10. The cationic alkyl polyglycoside soil-free drilling fluid according to claim 1, wherein the preparation method of the cationic alkyl polyglycoside soil-free drilling fluid requires the use of the cationic alkyl polyglycoside soil-free drilling fluid during its preparation, characterized in that: The method comprises the following steps: S1. Put a certain volume of clean water into the slurry preparation tank, add the cationic alkyl polyglycoside, coating agent, viscosity enhancer, fluid loss reducer, reservoir protection agent and weighting agent into the clean water in sequence, and stir and mix them evenly; S2, adding a pH adjuster to the mixed solution prepared in S1 for neutralization, then adding a bactericide and a defoamer, and stirring and mixing thoroughly; S3, adding lubricant to the mixed liquid prepared in S2, and finally preparing cationic alkyl polyglycoside soil-free drilling fluid.

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